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manager: don't place units in the 'cpu' group when run as user instance, for now
[thirdparty/systemd.git] / src / util.c
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d6c9574f 1/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
60918275 2
a7334b09
LP		 3/***
4 This file is part of systemd.
5
6 Copyright 2010 Lennart Poettering
7
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20***/
21
60918275
LP		 22#include <assert.h>
23#include <string.h>
24#include <unistd.h>
25#include <errno.h>
85261803 26#include <stdlib.h>
034c6ed7
LP		 27#include <signal.h>
28#include <stdio.h>
1dccbe19
LP		 29#include <syslog.h>
30#include <sched.h>
31#include <sys/resource.h>
ef886c6a 32#include <linux/sched.h>
a9f5d454
LP		 33#include <sys/types.h>
34#include <sys/stat.h>
3a0ecb08 35#include <fcntl.h>
a0d40ac5 36#include <dirent.h>
601f6a1e
LP		 37#include <sys/ioctl.h>
38#include <linux/vt.h>
39#include <linux/tiocl.h>
80876c20
LP		 40#include <termios.h>
41#include <stdarg.h>
42#include <sys/inotify.h>
43#include <sys/poll.h>
8d567588 44#include <libgen.h>
3177a7fa 45#include <ctype.h>
5b6319dc 46#include <sys/prctl.h>
ef2f1067
LP		 47#include <sys/utsname.h>
48#include <pwd.h>
4fd5948e 49#include <netinet/ip.h>
3fe5e5d4 50#include <linux/kd.h>
afea26ad 51#include <dlfcn.h>
2e78aa99 52#include <sys/wait.h>
ac123445 53#include <sys/capability.h>
7948c4df
KS		 54#include <sys/time.h>
55#include <linux/rtc.h>
8092a428 56#include <glob.h>
4b67834e 57#include <grp.h>
87d2c1ff 58#include <sys/mman.h>
60918275
LP		 59
60#include "macro.h"
61#include "util.h"
1dccbe19
LP		 62#include "ioprio.h"
63#include "missing.h"
a9f5d454 64#include "log.h"
65d2ebdc 65#include "strv.h"
e51bc1a2 66#include "label.h"
d06dacd0 67#include "exit-status.h"
83cc030f 68#include "hashmap.h"
56cf987f 69
9a0e6896
LP		 70int saved_argc = 0;
71char **saved_argv = NULL;
72
37f85e66 73size_t page_size(void) {
74 static __thread size_t pgsz = 0;
75 long r;
76
87d2c1ff 77 if (_likely_(pgsz > 0))
37f85e66 78 return pgsz;
79
80 assert_se((r = sysconf(_SC_PAGESIZE)) > 0);
81
82 pgsz = (size_t) r;
83
84 return pgsz;
85}
86
e05797fb
LP		 87bool streq_ptr(const char *a, const char *b) {
88
89 /* Like streq(), but tries to make sense of NULL pointers */
90
91 if (a && b)
92 return streq(a, b);
93
94 if (!a && !b)
95 return true;
96
97 return false;
98}
99
47be870b 100usec_t now(clockid_t clock_id) {
60918275
LP		 101 struct timespec ts;
102
47be870b 103 assert_se(clock_gettime(clock_id, &ts) == 0);
60918275
LP		 104
105 return timespec_load(&ts);
106}
107
63983207 108dual_timestamp* dual_timestamp_get(dual_timestamp *ts) {
871d7de4
LP		 109 assert(ts);
110
111 ts->realtime = now(CLOCK_REALTIME);
112 ts->monotonic = now(CLOCK_MONOTONIC);
113
114 return ts;
115}
116
a185c5aa
LP		 117dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) {
118 int64_t delta;
119 assert(ts);
120
121 ts->realtime = u;
122
123 if (u == 0)
124 ts->monotonic = 0;
125 else {
126 delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;
127
128 ts->monotonic = now(CLOCK_MONOTONIC);
129
130 if ((int64_t) ts->monotonic > delta)
131 ts->monotonic -= delta;
132 else
133 ts->monotonic = 0;
134 }
135
136 return ts;
137}
138
60918275
LP		 139usec_t timespec_load(const struct timespec *ts) {
140 assert(ts);
141
142 return
143 (usec_t) ts->tv_sec * USEC_PER_SEC +
144 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
145}
146
147struct timespec *timespec_store(struct timespec *ts, usec_t u) {
148 assert(ts);
149
150 ts->tv_sec = (time_t) (u / USEC_PER_SEC);
151 ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
152
153 return ts;
154}
155
156usec_t timeval_load(const struct timeval *tv) {
157 assert(tv);
158
159 return
160 (usec_t) tv->tv_sec * USEC_PER_SEC +
161 (usec_t) tv->tv_usec;
162}
163
164struct timeval *timeval_store(struct timeval *tv, usec_t u) {
165 assert(tv);
166
167 tv->tv_sec = (time_t) (u / USEC_PER_SEC);
168 tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
169
170 return tv;
171}
172
173bool endswith(const char *s, const char *postfix) {
174 size_t sl, pl;
175
176 assert(s);
177 assert(postfix);
178
179 sl = strlen(s);
180 pl = strlen(postfix);
181
d4d0d4db
LP		 182 if (pl == 0)
183 return true;
184
60918275
LP		 185 if (sl < pl)
186 return false;
187
188 return memcmp(s + sl - pl, postfix, pl) == 0;
189}
190
191bool startswith(const char *s, const char *prefix) {
192 size_t sl, pl;
193
194 assert(s);
195 assert(prefix);
196
197 sl = strlen(s);
198 pl = strlen(prefix);
199
d4d0d4db
LP		 200 if (pl == 0)
201 return true;
202
60918275
LP		 203 if (sl < pl)
204 return false;
205
206 return memcmp(s, prefix, pl) == 0;
207}
208
3177a7fa
MAP		 209bool startswith_no_case(const char *s, const char *prefix) {
210 size_t sl, pl;
211 unsigned i;
212
213 assert(s);
214 assert(prefix);
215
216 sl = strlen(s);
217 pl = strlen(prefix);
218
219 if (pl == 0)
220 return true;
221
222 if (sl < pl)
223 return false;
224
225 for(i = 0; i < pl; ++i) {
226 if (tolower(s[i]) != tolower(prefix[i]))
227 return false;
228 }
229
230 return true;
231}
232
79d6d816
LP		 233bool first_word(const char *s, const char *word) {
234 size_t sl, wl;
235
236 assert(s);
237 assert(word);
238
239 sl = strlen(s);
240 wl = strlen(word);
241
242 if (sl < wl)
243 return false;
244
d4d0d4db
LP		 245 if (wl == 0)
246 return true;
247
79d6d816
LP		 248 if (memcmp(s, word, wl) != 0)
249 return false;
250
d4d0d4db
LP		 251 return s[wl] == 0 ||
252 strchr(WHITESPACE, s[wl]);
79d6d816
LP		 253}
254
42f4e3c4 255int close_nointr(int fd) {
60918275
LP		 256 assert(fd >= 0);
257
258 for (;;) {
259 int r;
260
48f82119
LP		 261 r = close(fd);
262 if (r >= 0)
60918275
LP		 263 return r;
264
265 if (errno != EINTR)
48f82119 266 return -errno;
60918275
LP		 267 }
268}
85261803 269
85f136b5 270void close_nointr_nofail(int fd) {
80876c20 271 int saved_errno = errno;
85f136b5
LP		 272
273 /* like close_nointr() but cannot fail, and guarantees errno
274 * is unchanged */
275
276 assert_se(close_nointr(fd) == 0);
80876c20
LP		 277
278 errno = saved_errno;
85f136b5
LP		 279}
280
5b6319dc
LP		 281void close_many(const int fds[], unsigned n_fd) {
282 unsigned i;
283
284 for (i = 0; i < n_fd; i++)
285 close_nointr_nofail(fds[i]);
286}
287
85261803
LP		 288int parse_boolean(const char *v) {
289 assert(v);
290
44d8db9e 291 if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
85261803 292 return 1;
44d8db9e 293 else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
85261803
LP		 294 return 0;
295
296 return -EINVAL;
297}
298
3ba686c1 299int parse_pid(const char *s, pid_t* ret_pid) {
0b172489 300 unsigned long ul = 0;
3ba686c1
LP		 301 pid_t pid;
302 int r;
303
304 assert(s);
305 assert(ret_pid);
306
307 if ((r = safe_atolu(s, &ul)) < 0)
308 return r;
309
310 pid = (pid_t) ul;
311
312 if ((unsigned long) pid != ul)
313 return -ERANGE;
314
315 if (pid <= 0)
316 return -ERANGE;
317
318 *ret_pid = pid;
319 return 0;
320}
321
034a2a52
LP		 322int parse_uid(const char *s, uid_t* ret_uid) {
323 unsigned long ul = 0;
324 uid_t uid;
325 int r;
326
327 assert(s);
328 assert(ret_uid);
329
330 if ((r = safe_atolu(s, &ul)) < 0)
331 return r;
332
333 uid = (uid_t) ul;
334
335 if ((unsigned long) uid != ul)
336 return -ERANGE;
337
338 *ret_uid = uid;
339 return 0;
340}
341
85261803
LP		 342int safe_atou(const char *s, unsigned *ret_u) {
343 char *x = NULL;
034c6ed7 344 unsigned long l;
85261803
LP		 345
346 assert(s);
347 assert(ret_u);
348
349 errno = 0;
350 l = strtoul(s, &x, 0);
351
352 if (!x || *x || errno)
353 return errno ? -errno : -EINVAL;
354
034c6ed7 355 if ((unsigned long) (unsigned) l != l)
85261803
LP		 356 return -ERANGE;
357
358 *ret_u = (unsigned) l;
359 return 0;
360}
361
362int safe_atoi(const char *s, int *ret_i) {
363 char *x = NULL;
034c6ed7 364 long l;
85261803
LP		 365
366 assert(s);
367 assert(ret_i);
368
369 errno = 0;
370 l = strtol(s, &x, 0);
371
372 if (!x || *x || errno)
373 return errno ? -errno : -EINVAL;
374
034c6ed7 375 if ((long) (int) l != l)
85261803
LP		 376 return -ERANGE;
377
034c6ed7
LP		 378 *ret_i = (int) l;
379 return 0;
380}
381
034c6ed7
LP		 382int safe_atollu(const char *s, long long unsigned *ret_llu) {
383 char *x = NULL;
384 unsigned long long l;
385
386 assert(s);
387 assert(ret_llu);
388
389 errno = 0;
390 l = strtoull(s, &x, 0);
391
392 if (!x || *x || errno)
393 return errno ? -errno : -EINVAL;
394
395 *ret_llu = l;
396 return 0;
397}
398
399int safe_atolli(const char *s, long long int *ret_lli) {
400 char *x = NULL;
401 long long l;
402
403 assert(s);
404 assert(ret_lli);
405
406 errno = 0;
407 l = strtoll(s, &x, 0);
408
409 if (!x || *x || errno)
410 return errno ? -errno : -EINVAL;
411
412 *ret_lli = l;
85261803
LP		 413 return 0;
414}
a41e8209 415
a41e8209 416/* Split a string into words. */
65d2ebdc 417char *split(const char *c, size_t *l, const char *separator, char **state) {
a41e8209
LP		 418 char *current;
419
420 current = *state ? *state : (char*) c;
421
422 if (!*current || *c == 0)
423 return NULL;
424
65d2ebdc
LP		 425 current += strspn(current, separator);
426 *l = strcspn(current, separator);
82919e3d
LP		 427 *state = current+*l;
428
429 return (char*) current;
430}
431
034c6ed7
LP		 432/* Split a string into words, but consider strings enclosed in '' and
433 * "" as words even if they include spaces. */
434char *split_quoted(const char *c, size_t *l, char **state) {
0bab36f2
LP		 435 char *current, *e;
436 bool escaped = false;
034c6ed7
LP		 437
438 current = *state ? *state : (char*) c;
439
440 if (!*current || *c == 0)
441 return NULL;
442
443 current += strspn(current, WHITESPACE);
444
445 if (*current == '\'') {
446 current ++;
034c6ed7 447
0bab36f2
LP		 448 for (e = current; *e; e++) {
449 if (escaped)
450 escaped = false;
451 else if (*e == '\\')
452 escaped = true;
453 else if (*e == '\'')
454 break;
455 }
456
457 *l = e-current;
458 *state = *e == 0 ? e : e+1;
034c6ed7
LP		 459 } else if (*current == '\"') {
460 current ++;
034c6ed7 461
0bab36f2
LP		 462 for (e = current; *e; e++) {
463 if (escaped)
464 escaped = false;
465 else if (*e == '\\')
466 escaped = true;
467 else if (*e == '\"')
468 break;
469 }
470
471 *l = e-current;
472 *state = *e == 0 ? e : e+1;
034c6ed7 473 } else {
0bab36f2
LP		 474 for (e = current; *e; e++) {
475 if (escaped)
476 escaped = false;
477 else if (*e == '\\')
478 escaped = true;
479 else if (strchr(WHITESPACE, *e))
480 break;
481 }
482 *l = e-current;
483 *state = e;
034c6ed7
LP		 484 }
485
486 return (char*) current;
487}
488
65d2ebdc
LP		 489char **split_path_and_make_absolute(const char *p) {
490 char **l;
491 assert(p);
492
493 if (!(l = strv_split(p, ":")))
494 return NULL;
495
496 if (!strv_path_make_absolute_cwd(l)) {
497 strv_free(l);
498 return NULL;
499 }
500
501 return l;
502}
503
034c6ed7
LP		 504int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
505 int r;
506 FILE *f;
20c03b7b 507 char fn[PATH_MAX], line[LINE_MAX], *p;
bb00e604 508 long unsigned ppid;
034c6ed7 509
8480e784 510 assert(pid > 0);
034c6ed7
LP		 511 assert(_ppid);
512
bb00e604 513 assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1));
8480e784 514 char_array_0(fn);
034c6ed7 515
ccaa6149 516 if (!(f = fopen(fn, "re")))
034c6ed7
LP		 517 return -errno;
518
519 if (!(fgets(line, sizeof(line), f))) {
35d50f55 520 r = feof(f) ? -EIO : -errno;
034c6ed7
LP		 521 fclose(f);
522 return r;
523 }
524
525 fclose(f);
526
527 /* Let's skip the pid and comm fields. The latter is enclosed
528 * in () but does not escape any () in its value, so let's
529 * skip over it manually */
530
531 if (!(p = strrchr(line, ')')))
532 return -EIO;
533
534 p++;
535
536 if (sscanf(p, " "
537 "%*c " /* state */
bb00e604 538 "%lu ", /* ppid */
034c6ed7
LP		 539 &ppid) != 1)
540 return -EIO;
541
bb00e604 542 if ((long unsigned) (pid_t) ppid != ppid)
034c6ed7
LP		 543 return -ERANGE;
544
545 *_ppid = (pid_t) ppid;
546
547 return 0;
548}
549
7640a5de
LP		 550int get_starttime_of_pid(pid_t pid, unsigned long long *st) {
551 int r;
552 FILE *f;
553 char fn[PATH_MAX], line[LINE_MAX], *p;
554
555 assert(pid > 0);
556 assert(st);
557
558 assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1));
559 char_array_0(fn);
560
ccaa6149 561 if (!(f = fopen(fn, "re")))
7640a5de
LP		 562 return -errno;
563
564 if (!(fgets(line, sizeof(line), f))) {
35d50f55 565 r = feof(f) ? -EIO : -errno;
7640a5de
LP		 566 fclose(f);
567 return r;
568 }
569
570 fclose(f);
571
572 /* Let's skip the pid and comm fields. The latter is enclosed
573 * in () but does not escape any () in its value, so let's
574 * skip over it manually */
575
576 if (!(p = strrchr(line, ')')))
577 return -EIO;
578
579 p++;
580
581 if (sscanf(p, " "
582 "%*c " /* state */
583 "%*d " /* ppid */
584 "%*d " /* pgrp */
585 "%*d " /* session */
586 "%*d " /* tty_nr */
587 "%*d " /* tpgid */
588 "%*u " /* flags */
589 "%*u " /* minflt */
590 "%*u " /* cminflt */
591 "%*u " /* majflt */
592 "%*u " /* cmajflt */
593 "%*u " /* utime */
594 "%*u " /* stime */
595 "%*d " /* cutime */
596 "%*d " /* cstime */
597 "%*d " /* priority */
598 "%*d " /* nice */
599 "%*d " /* num_threads */
600 "%*d " /* itrealvalue */
601 "%llu " /* starttime */,
602 st) != 1)
603 return -EIO;
604
605 return 0;
606}
607
034c6ed7
LP		 608int write_one_line_file(const char *fn, const char *line) {
609 FILE *f;
610 int r;
611
612 assert(fn);
613 assert(line);
614
615 if (!(f = fopen(fn, "we")))
616 return -errno;
617
34ca941c 618 errno = 0;
034c6ed7
LP		 619 if (fputs(line, f) < 0) {
620 r = -errno;
621 goto finish;
622 }
623
8e1bd70d
LP		 624 if (!endswith(line, "\n"))
625 fputc('\n', f);
626
151b190e
LP		 627 fflush(f);
628
629 if (ferror(f)) {
630 if (errno != 0)
631 r = -errno;
632 else
633 r = -EIO;
634 } else
635 r = 0;
636
034c6ed7
LP		 637finish:
638 fclose(f);
639 return r;
640}
641
34ca941c
LP		 642int fchmod_umask(int fd, mode_t m) {
643 mode_t u;
644 int r;
645
646 u = umask(0777);
647 r = fchmod(fd, m & (~u)) < 0 ? -errno : 0;
648 umask(u);
649
650 return r;
651}
652
653int write_one_line_file_atomic(const char *fn, const char *line) {
654 FILE *f;
655 int r;
656 char *p;
657
658 assert(fn);
659 assert(line);
660
661 r = fopen_temporary(fn, &f, &p);
662 if (r < 0)
663 return r;
664
665 fchmod_umask(fileno(f), 0644);
666
667 errno = 0;
668 if (fputs(line, f) < 0) {
669 r = -errno;
670 goto finish;
671 }
672
673 if (!endswith(line, "\n"))
674 fputc('\n', f);
675
676 fflush(f);
677
678 if (ferror(f)) {
679 if (errno != 0)
680 r = -errno;
681 else
682 r = -EIO;
683 } else {
684 if (rename(p, fn) < 0)
685 r = -errno;
686 else
687 r = 0;
688 }
689
690finish:
691 if (r < 0)
692 unlink(p);
693
694 fclose(f);
695 free(p);
696
697 return r;
698}
699
034c6ed7
LP		 700int read_one_line_file(const char *fn, char **line) {
701 FILE *f;
702 int r;
97c4a07d 703 char t[LINE_MAX], *c;
034c6ed7
LP		 704
705 assert(fn);
706 assert(line);
707
708 if (!(f = fopen(fn, "re")))
709 return -errno;
710
711 if (!(fgets(t, sizeof(t), f))) {
35d50f55 712 r = feof(f) ? -EIO : -errno;
034c6ed7
LP		 713 goto finish;
714 }
715
716 if (!(c = strdup(t))) {
717 r = -ENOMEM;
718 goto finish;
719 }
720
6f9a471a
LP		 721 truncate_nl(c);
722
034c6ed7
LP		 723 *line = c;
724 r = 0;
725
726finish:
727 fclose(f);
728 return r;
729}
44d8db9e 730
34ca941c 731int read_full_file(const char *fn, char **contents, size_t *size) {
97c4a07d
LP		 732 FILE *f;
733 int r;
734 size_t n, l;
735 char *buf = NULL;
736 struct stat st;
737
738 if (!(f = fopen(fn, "re")))
739 return -errno;
740
741 if (fstat(fileno(f), &st) < 0) {
742 r = -errno;
743 goto finish;
744 }
745
34ca941c
LP		 746 /* Safety check */
747 if (st.st_size > 4*1024*1024) {
748 r = -E2BIG;
749 goto finish;
750 }
751
97c4a07d
LP		 752 n = st.st_size > 0 ? st.st_size : LINE_MAX;
753 l = 0;
754
755 for (;;) {
756 char *t;
757 size_t k;
758
759 if (!(t = realloc(buf, n+1))) {
760 r = -ENOMEM;
761 goto finish;
762 }
763
764 buf = t;
765 k = fread(buf + l, 1, n - l, f);
766
767 if (k <= 0) {
768 if (ferror(f)) {
769 r = -errno;
770 goto finish;
771 }
772
773 break;
774 }
775
776 l += k;
777 n *= 2;
778
779 /* Safety check */
780 if (n > 4*1024*1024) {
781 r = -E2BIG;
782 goto finish;
783 }
784 }
785
f8440af5 786 buf[l] = 0;
97c4a07d
LP		 787 *contents = buf;
788 buf = NULL;
789
34ca941c
LP		 790 if (size)
791 *size = l;
792
97c4a07d
LP		 793 r = 0;
794
795finish:
796 fclose(f);
797 free(buf);
798
799 return r;
800}
801
802int parse_env_file(
803 const char *fname,
c899f8c6 804 const char *separator, ...) {
97c4a07d 805
ce8a6aa1 806 int r = 0;
44d91056 807 char *contents = NULL, *p;
97c4a07d
LP		 808
809 assert(fname);
c899f8c6 810 assert(separator);
97c4a07d 811
34ca941c 812 if ((r = read_full_file(fname, &contents, NULL)) < 0)
97c4a07d
LP		 813 return r;
814
815 p = contents;
816 for (;;) {
817 const char *key = NULL;
818
c899f8c6 819 p += strspn(p, separator);
97c4a07d
LP		 820 p += strspn(p, WHITESPACE);
821
822 if (!*p)
823 break;
824
825 if (!strchr(COMMENTS, *p)) {
826 va_list ap;
827 char **value;
828
c899f8c6 829 va_start(ap, separator);
97c4a07d
LP		 830 while ((key = va_arg(ap, char *))) {
831 size_t n;
832 char *v;
833
834 value = va_arg(ap, char **);
835
836 n = strlen(key);
837 if (strncmp(p, key, n) != 0 ||
838 p[n] != '=')
839 continue;
840
841 p += n + 1;
c899f8c6 842 n = strcspn(p, separator);
97c4a07d
LP		 843
844 if (n >= 2 &&
e7db37dd
LP		 845 strchr(QUOTES, p[0]) &&
846 p[n-1] == p[0])
97c4a07d
LP		 847 v = strndup(p+1, n-2);
848 else
849 v = strndup(p, n);
850
851 if (!v) {
852 r = -ENOMEM;
853 va_end(ap);
854 goto fail;
855 }
856
dd36de4d
KS		 857 if (v[0] == '\0') {
858 /* return empty value strings as NULL */
859 free(v);
860 v = NULL;
861 }
862
97c4a07d
LP		 863 free(*value);
864 *value = v;
865
866 p += n;
ce8a6aa1
LP		 867
868 r ++;
97c4a07d
LP		 869 break;
870 }
871 va_end(ap);
872 }
873
874 if (!key)
c899f8c6 875 p += strcspn(p, separator);
97c4a07d
LP		 876 }
877
97c4a07d
LP		 878fail:
879 free(contents);
880 return r;
881}
882
8c7be95e
LP		 883int load_env_file(
884 const char *fname,
885 char ***rl) {
886
887 FILE *f;
888 char **m = 0;
889 int r;
890
891 assert(fname);
892 assert(rl);
893
894 if (!(f = fopen(fname, "re")))
895 return -errno;
896
897 while (!feof(f)) {
898 char l[LINE_MAX], *p, *u;
899 char **t;
900
901 if (!fgets(l, sizeof(l), f)) {
902 if (feof(f))
903 break;
904
905 r = -errno;
906 goto finish;
907 }
908
909 p = strstrip(l);
910
911 if (!*p)
912 continue;
913
914 if (strchr(COMMENTS, *p))
915 continue;
916
917 if (!(u = normalize_env_assignment(p))) {
918 log_error("Out of memory");
919 r = -ENOMEM;
920 goto finish;
921 }
922
923 t = strv_append(m, u);
924 free(u);
925
926 if (!t) {
927 log_error("Out of memory");
928 r = -ENOMEM;
929 goto finish;
930 }
931
932 strv_free(m);
933 m = t;
934 }
935
936 r = 0;
937
938 *rl = m;
939 m = NULL;
940
941finish:
942 if (f)
943 fclose(f);
944
945 strv_free(m);
946
947 return r;
948}
949
7640a5de 950int write_env_file(const char *fname, char **l) {
34ca941c 951 char **i, *p;
7640a5de
LP		 952 FILE *f;
953 int r;
954
34ca941c
LP		 955 r = fopen_temporary(fname, &f, &p);
956 if (r < 0)
957 return r;
7640a5de 958
34ca941c
LP		 959 fchmod_umask(fileno(f), 0644);
960
961 errno = 0;
7640a5de
LP		 962 STRV_FOREACH(i, l) {
963 fputs(*i, f);
964 fputc('\n', f);
965 }
966
967 fflush(f);
968
34ca941c
LP		 969 if (ferror(f)) {
970 if (errno != 0)
971 r = -errno;
972 else
973 r = -EIO;
974 } else {
975 if (rename(p, fname) < 0)
976 r = -errno;
977 else
978 r = 0;
979 }
980
981 if (r < 0)
982 unlink(p);
983
7640a5de 984 fclose(f);
34ca941c 985 free(p);
7640a5de
LP		 986
987 return r;
988}
989
7072ced8
LP		 990char *truncate_nl(char *s) {
991 assert(s);
992
993 s[strcspn(s, NEWLINE)] = 0;
994 return s;
995}
996
87d2c1ff 997int get_process_comm(pid_t pid, char **name) {
7072ced8
LP		 998 int r;
999
7072ced8
LP		 1000 assert(name);
1001
87d2c1ff
LP		 1002 if (pid == 0)
1003 r = read_one_line_file("/proc/self/comm", name);
1004 else {
1005 char *p;
1006 if (asprintf(&p, "/proc/%lu/comm", (unsigned long) pid) < 0)
1007 return -ENOMEM;
7072ced8 1008
87d2c1ff
LP		 1009 r = read_one_line_file(p, name);
1010 free(p);
1011 }
7072ced8 1012
87d2c1ff 1013 return r;
7072ced8
LP		 1014}
1015
87d2c1ff
LP		 1016int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) {
1017 char *r, *k;
c59760ee
LP		 1018 int c;
1019 bool space = false;
1020 size_t left;
1021 FILE *f;
1022
c59760ee
LP		 1023 assert(max_length > 0);
1024 assert(line);
1025
87d2c1ff
LP		 1026 if (pid == 0)
1027 f = fopen("/proc/self/cmdline", "re");
1028 else {
1029 char *p;
1030 if (asprintf(&p, "/proc/%lu/cmdline", (unsigned long) pid) < 0)
1031 return -ENOMEM;
c59760ee 1032
87d2c1ff
LP		 1033 f = fopen(p, "re");
1034 free(p);
1035 }
c59760ee
LP		 1036
1037 if (!f)
1038 return -errno;
1039
87d2c1ff
LP		 1040 r = new(char, max_length);
1041 if (!r) {
c59760ee
LP		 1042 fclose(f);
1043 return -ENOMEM;
1044 }
1045
1046 k = r;
1047 left = max_length;
1048 while ((c = getc(f)) != EOF) {
1049
1050 if (isprint(c)) {
1051 if (space) {
1052 if (left <= 4)
1053 break;
1054
1055 *(k++) = ' ';
057fbb58 1056 left--;
c59760ee
LP		 1057 space = false;
1058 }
1059
1060 if (left <= 4)
1061 break;
1062
1063 *(k++) = (char) c;
057fbb58 1064 left--;
c59760ee
LP		 1065 } else
1066 space = true;
1067 }
1068
1069 if (left <= 4) {
1070 size_t n = MIN(left-1, 3U);
1071 memcpy(k, "...", n);
1072 k[n] = 0;
1073 } else
1074 *k = 0;
1075
1076 fclose(f);
1077
35d2e7ec
LP		 1078 /* Kernel threads have no argv[] */
1079 if (r[0] == 0) {
1080 char *t;
1081 int h;
1082
1083 free(r);
1084
87d2c1ff
LP		 1085 if (!comm_fallback)
1086 return -ENOENT;
1087
1088 h = get_process_comm(pid, &t);
1089 if (h < 0)
35d2e7ec
LP		 1090 return h;
1091
87d2c1ff 1092 r = join("[", t, "]", NULL);
35d2e7ec
LP		 1093 free(t);
1094
87d2c1ff 1095 if (!r)
35d2e7ec
LP		 1096 return -ENOMEM;
1097 }
fa776d8e 1098
c59760ee
LP		 1099 *line = r;
1100 return 0;
1101}
1102
87d2c1ff
LP		 1103int get_process_exe(pid_t pid, char **name) {
1104 int r;
1105
1106 assert(name);
1107
1108 if (pid == 0)
1109 r = readlink_malloc("/proc/self/exe", name);
1110 else {
1111 char *p;
1112 if (asprintf(&p, "/proc/%lu/exe", (unsigned long) pid) < 0)
1113 return -ENOMEM;
1114
1115 r = readlink_malloc(p, name);
1116 free(p);
1117 }
1118
1119 return r;
1120}
1121
7e4ab3c5
LP		 1122int get_process_uid(pid_t pid, uid_t *uid) {
1123 char *p;
1124 FILE *f;
1125 int r;
1126
1127 assert(uid);
1128
1129 if (pid == 0)
1130 return getuid();
1131
1132 if (asprintf(&p, "/proc/%lu/status", (unsigned long) pid) < 0)
1133 return -ENOMEM;
1134
1135 f = fopen(p, "re");
1136 free(p);
1137
1138 if (!f)
1139 return -errno;
1140
1141 while (!feof(f)) {
1142 char line[LINE_MAX], *l;
1143
1144 if (!fgets(line, sizeof(line), f)) {
1145 if (feof(f))
1146 break;
1147
1148 r = -errno;
1149 goto finish;
1150 }
1151
1152 l = strstrip(line);
1153
1154 if (startswith(l, "Uid:")) {
1155 l += 4;
1156 l += strspn(l, WHITESPACE);
1157
1158 l[strcspn(l, WHITESPACE)] = 0;
1159
1160 r = parse_uid(l, uid);
1161 goto finish;
1162 }
1163 }
1164
1165 r = -EIO;
1166
1167finish:
1168 fclose(f);
1169
1170 return r;
1171}
1172
fab56fc5
LP		 1173char *strnappend(const char *s, const char *suffix, size_t b) {
1174 size_t a;
44d8db9e
LP		 1175 char *r;
1176
fab56fc5
LP		 1177 if (!s && !suffix)
1178 return strdup("");
1179
1180 if (!s)
1181 return strndup(suffix, b);
1182
1183 if (!suffix)
1184 return strdup(s);
1185
44d8db9e
LP		 1186 assert(s);
1187 assert(suffix);
1188
1189 a = strlen(s);
44d8db9e
LP		 1190
1191 if (!(r = new(char, a+b+1)))
1192 return NULL;
1193
1194 memcpy(r, s, a);
1195 memcpy(r+a, suffix, b);
1196 r[a+b] = 0;
1197
1198 return r;
1199}
87f0e418 1200
fab56fc5
LP		 1201char *strappend(const char *s, const char *suffix) {
1202 return strnappend(s, suffix, suffix ? strlen(suffix) : 0);
1203}
1204
87f0e418
LP		 1205int readlink_malloc(const char *p, char **r) {
1206 size_t l = 100;
1207
1208 assert(p);
1209 assert(r);
1210
1211 for (;;) {
1212 char *c;
1213 ssize_t n;
1214
1215 if (!(c = new(char, l)))
1216 return -ENOMEM;
1217
1218 if ((n = readlink(p, c, l-1)) < 0) {
1219 int ret = -errno;
1220 free(c);
1221 return ret;
1222 }
1223
1224 if ((size_t) n < l-1) {
1225 c[n] = 0;
1226 *r = c;
1227 return 0;
1228 }
1229
1230 free(c);
1231 l *= 2;
1232 }
1233}
1234
2c7108c4
LP		 1235int readlink_and_make_absolute(const char *p, char **r) {
1236 char *target, *k;
1237 int j;
1238
1239 assert(p);
1240 assert(r);
1241
1242 if ((j = readlink_malloc(p, &target)) < 0)
1243 return j;
1244
1245 k = file_in_same_dir(p, target);
1246 free(target);
1247
1248 if (!k)
1249 return -ENOMEM;
1250
1251 *r = k;
1252 return 0;
1253}
1254
83096483
LP		 1255int readlink_and_canonicalize(const char *p, char **r) {
1256 char *t, *s;
1257 int j;
1258
1259 assert(p);
1260 assert(r);
1261
1262 j = readlink_and_make_absolute(p, &t);
1263 if (j < 0)
1264 return j;
1265
1266 s = canonicalize_file_name(t);
1267 if (s) {
1268 free(t);
1269 *r = s;
1270 } else
1271 *r = t;
1272
1273 path_kill_slashes(*r);
1274
1275 return 0;
1276}
1277
35d2e7ec
LP		 1278int parent_of_path(const char *path, char **_r) {
1279 const char *e, *a = NULL, *b = NULL, *p;
1280 char *r;
1281 bool slash = false;
1282
1283 assert(path);
1284 assert(_r);
1285
1286 if (!*path)
1287 return -EINVAL;
1288
1289 for (e = path; *e; e++) {
1290
1291 if (!slash && *e == '/') {
1292 a = b;
1293 b = e;
1294 slash = true;
1295 } else if (slash && *e != '/')
1296 slash = false;
1297 }
1298
1299 if (*(e-1) == '/')
1300 p = a;
1301 else
1302 p = b;
1303
1304 if (!p)
1305 return -EINVAL;
1306
1307 if (p == path)
1308 r = strdup("/");
1309 else
1310 r = strndup(path, p-path);
1311
1312 if (!r)
1313 return -ENOMEM;
1314
1315 *_r = r;
1316 return 0;
1317}
1318
1319
87f0e418
LP		 1320char *file_name_from_path(const char *p) {
1321 char *r;
1322
1323 assert(p);
1324
1325 if ((r = strrchr(p, '/')))
1326 return r + 1;
1327
1328 return (char*) p;
1329}
0301abf4
LP		 1330
1331bool path_is_absolute(const char *p) {
1332 assert(p);
1333
1334 return p[0] == '/';
1335}
1336
1337bool is_path(const char *p) {
1338
1339 return !!strchr(p, '/');
1340}
1341
1342char *path_make_absolute(const char *p, const char *prefix) {
0301abf4
LP		 1343 assert(p);
1344
65d2ebdc
LP		 1345 /* Makes every item in the list an absolute path by prepending
1346 * the prefix, if specified and necessary */
1347
0301abf4
LP		 1348 if (path_is_absolute(p) || !prefix)
1349 return strdup(p);
1350
44d91056 1351 return join(prefix, "/", p, NULL);
0301abf4 1352}
2a987ee8 1353
65d2ebdc
LP		 1354char *path_make_absolute_cwd(const char *p) {
1355 char *cwd, *r;
1356
1357 assert(p);
1358
1359 /* Similar to path_make_absolute(), but prefixes with the
1360 * current working directory. */
1361
1362 if (path_is_absolute(p))
1363 return strdup(p);
1364
1365 if (!(cwd = get_current_dir_name()))
1366 return NULL;
1367
1368 r = path_make_absolute(p, cwd);
1369 free(cwd);
1370
1371 return r;
1372}
1373
1374char **strv_path_make_absolute_cwd(char **l) {
1375 char **s;
1376
1377 /* Goes through every item in the string list and makes it
1378 * absolute. This works in place and won't rollback any
1379 * changes on failure. */
1380
1381 STRV_FOREACH(s, l) {
1382 char *t;
1383
1384 if (!(t = path_make_absolute_cwd(*s)))
1385 return NULL;
1386
1387 free(*s);
1388 *s = t;
1389 }
1390
1391 return l;
1392}
1393
c3f6d675
LP		 1394char **strv_path_canonicalize(char **l) {
1395 char **s;
1396 unsigned k = 0;
1397 bool enomem = false;
1398
1399 if (strv_isempty(l))
1400 return l;
1401
1402 /* Goes through every item in the string list and canonicalize
1403 * the path. This works in place and won't rollback any
1404 * changes on failure. */
1405
1406 STRV_FOREACH(s, l) {
1407 char *t, *u;
1408
1409 t = path_make_absolute_cwd(*s);
1410 free(*s);
1411
1412 if (!t) {
1413 enomem = true;
1414 continue;
1415 }
1416
1417 errno = 0;
1418 u = canonicalize_file_name(t);
1419 free(t);
1420
1421 if (!u) {
1422 if (errno == ENOMEM || !errno)
1423 enomem = true;
1424
1425 continue;
1426 }
1427
1428 l[k++] = u;
1429 }
1430
1431 l[k] = NULL;
1432
1433 if (enomem)
1434 return NULL;
1435
1436 return l;
a9dd2082
LP		 1437}
1438
1439char **strv_path_remove_empty(char **l) {
1440 char **f, **t;
1441
1442 if (!l)
1443 return NULL;
1444
1445 for (f = t = l; *f; f++) {
1446
1447 if (dir_is_empty(*f) > 0) {
1448 free(*f);
1449 continue;
1450 }
1451
1452 *(t++) = *f;
1453 }
1454
1455 *t = NULL;
1456 return l;
c3f6d675
LP		 1457}
1458
2a987ee8
LP		 1459int reset_all_signal_handlers(void) {
1460 int sig;
1461
1462 for (sig = 1; sig < _NSIG; sig++) {
1463 struct sigaction sa;
1464
1465 if (sig == SIGKILL || sig == SIGSTOP)
1466 continue;
1467
1468 zero(sa);
1469 sa.sa_handler = SIG_DFL;
431c32bf 1470 sa.sa_flags = SA_RESTART;
2a987ee8
LP		 1471
1472 /* On Linux the first two RT signals are reserved by
1473 * glibc, and sigaction() will return EINVAL for them. */
1474 if ((sigaction(sig, &sa, NULL) < 0))
1475 if (errno != EINVAL)
1476 return -errno;
1477 }
1478
8e274523 1479 return 0;
2a987ee8 1480}
4a72ff34
LP		 1481
1482char *strstrip(char *s) {
57a8eca8 1483 char *e;
4a72ff34
LP		 1484
1485 /* Drops trailing whitespace. Modifies the string in
1486 * place. Returns pointer to first non-space character */
1487
1488 s += strspn(s, WHITESPACE);
1489
57a8eca8
LP		 1490 for (e = strchr(s, 0); e > s; e --)
1491 if (!strchr(WHITESPACE, e[-1]))
1492 break;
4a72ff34 1493
57a8eca8 1494 *e = 0;
4a72ff34
LP		 1495
1496 return s;
4a72ff34
LP		 1497}
1498
ee9b5e01
LP		 1499char *delete_chars(char *s, const char *bad) {
1500 char *f, *t;
1501
1502 /* Drops all whitespace, regardless where in the string */
1503
1504 for (f = s, t = s; *f; f++) {
1505 if (strchr(bad, *f))
1506 continue;
1507
1508 *(t++) = *f;
1509 }
1510
1511 *t = 0;
1512
1513 return s;
1514}
1515
ab1f0633
LP		 1516bool in_charset(const char *s, const char* charset) {
1517 const char *i;
1518
1519 assert(s);
1520 assert(charset);
1521
1522 for (i = s; *i; i++)
1523 if (!strchr(charset, *i))
1524 return false;
1525
1526 return true;
1527}
1528
4a72ff34
LP		 1529char *file_in_same_dir(const char *path, const char *filename) {
1530 char *e, *r;
1531 size_t k;
1532
1533 assert(path);
1534 assert(filename);
1535
1536 /* This removes the last component of path and appends
1537 * filename, unless the latter is absolute anyway or the
1538 * former isn't */
1539
1540 if (path_is_absolute(filename))
1541 return strdup(filename);
1542
1543 if (!(e = strrchr(path, '/')))
1544 return strdup(filename);
1545
1546 k = strlen(filename);
1547 if (!(r = new(char, e-path+1+k+1)))
1548 return NULL;
1549
1550 memcpy(r, path, e-path+1);
1551 memcpy(r+(e-path)+1, filename, k+1);
1552
1553 return r;
1554}
fb624d04 1555
8c6db833
LP		 1556int safe_mkdir(const char *path, mode_t mode, uid_t uid, gid_t gid) {
1557 struct stat st;
1558
56cf987f 1559 if (label_mkdir(path, mode) >= 0)
8c6db833
LP		 1560 if (chmod_and_chown(path, mode, uid, gid) < 0)
1561 return -errno;
1562
1563 if (lstat(path, &st) < 0)
1564 return -errno;
1565
1566 if ((st.st_mode & 0777) != mode ||
1567 st.st_uid != uid ||
1568 st.st_gid != gid ||
1569 !S_ISDIR(st.st_mode)) {
1570 errno = EEXIST;
1571 return -errno;
1572 }
1573
1574 return 0;
1575}
1576
1577
a9f5d454
LP		 1578int mkdir_parents(const char *path, mode_t mode) {
1579 const char *p, *e;
1580
1581 assert(path);
1582
1583 /* Creates every parent directory in the path except the last
1584 * component. */
1585
1586 p = path + strspn(path, "/");
1587 for (;;) {
1588 int r;
1589 char *t;
1590
1591 e = p + strcspn(p, "/");
1592 p = e + strspn(e, "/");
1593
1594 /* Is this the last component? If so, then we're
1595 * done */
1596 if (*p == 0)
1597 return 0;
1598
1599 if (!(t = strndup(path, e - path)))
1600 return -ENOMEM;
1601
56cf987f 1602 r = label_mkdir(t, mode);
a9f5d454
LP		 1603 free(t);
1604
1605 if (r < 0 && errno != EEXIST)
1606 return -errno;
1607 }
1608}
1609
bbd67135
LP		 1610int mkdir_p(const char *path, mode_t mode) {
1611 int r;
1612
1613 /* Like mkdir -p */
1614
1615 if ((r = mkdir_parents(path, mode)) < 0)
1616 return r;
1617
56cf987f 1618 if (label_mkdir(path, mode) < 0 && errno != EEXIST)
bbd67135
LP		 1619 return -errno;
1620
1621 return 0;
1622}
1623
c32dd69b
LP		 1624int rmdir_parents(const char *path, const char *stop) {
1625 size_t l;
1626 int r = 0;
1627
1628 assert(path);
1629 assert(stop);
1630
1631 l = strlen(path);
1632
1633 /* Skip trailing slashes */
1634 while (l > 0 && path[l-1] == '/')
1635 l--;
1636
1637 while (l > 0) {
1638 char *t;
1639
1640 /* Skip last component */
1641 while (l > 0 && path[l-1] != '/')
1642 l--;
1643
1644 /* Skip trailing slashes */
1645 while (l > 0 && path[l-1] == '/')
1646 l--;
1647
1648 if (l <= 0)
1649 break;
1650
1651 if (!(t = strndup(path, l)))
1652 return -ENOMEM;
1653
1654 if (path_startswith(stop, t)) {
1655 free(t);
1656 return 0;
1657 }
1658
1659 r = rmdir(t);
1660 free(t);
1661
1662 if (r < 0)
1663 if (errno != ENOENT)
1664 return -errno;
1665 }
1666
1667 return 0;
1668}
1669
1670
fb624d04
LP		 1671char hexchar(int x) {
1672 static const char table[16] = "0123456789abcdef";
1673
1674 return table[x & 15];
1675}
4fe88d28
LP		 1676
1677int unhexchar(char c) {
1678
1679 if (c >= '0' && c <= '9')
1680 return c - '0';
1681
1682 if (c >= 'a' && c <= 'f')
ea430986 1683 return c - 'a' + 10;
4fe88d28
LP		 1684
1685 if (c >= 'A' && c <= 'F')
ea430986 1686 return c - 'A' + 10;
4fe88d28
LP		 1687
1688 return -1;
1689}
1690
1691char octchar(int x) {
1692 return '0' + (x & 7);
1693}
1694
1695int unoctchar(char c) {
1696
1697 if (c >= '0' && c <= '7')
1698 return c - '0';
1699
1700 return -1;
1701}
1702
5af98f82
LP		 1703char decchar(int x) {
1704 return '0' + (x % 10);
1705}
1706
1707int undecchar(char c) {
1708
1709 if (c >= '0' && c <= '9')
1710 return c - '0';
1711
1712 return -1;
1713}
1714
4fe88d28
LP		 1715char *cescape(const char *s) {
1716 char *r, *t;
1717 const char *f;
1718
1719 assert(s);
1720
1721 /* Does C style string escaping. */
1722
1723 if (!(r = new(char, strlen(s)*4 + 1)))
1724 return NULL;
1725
1726 for (f = s, t = r; *f; f++)
1727
1728 switch (*f) {
1729
1730 case '\a':
1731 *(t++) = '\\';
1732 *(t++) = 'a';
1733 break;
1734 case '\b':
1735 *(t++) = '\\';
1736 *(t++) = 'b';
1737 break;
1738 case '\f':
1739 *(t++) = '\\';
1740 *(t++) = 'f';
1741 break;
1742 case '\n':
1743 *(t++) = '\\';
1744 *(t++) = 'n';
1745 break;
1746 case '\r':
1747 *(t++) = '\\';
1748 *(t++) = 'r';
1749 break;
1750 case '\t':
1751 *(t++) = '\\';
1752 *(t++) = 't';
1753 break;
1754 case '\v':
1755 *(t++) = '\\';
1756 *(t++) = 'v';
1757 break;
1758 case '\\':
1759 *(t++) = '\\';
1760 *(t++) = '\\';
1761 break;
1762 case '"':
1763 *(t++) = '\\';
1764 *(t++) = '"';
1765 break;
1766 case '\'':
1767 *(t++) = '\\';
1768 *(t++) = '\'';
1769 break;
1770
1771 default:
1772 /* For special chars we prefer octal over
1773 * hexadecimal encoding, simply because glib's
1774 * g_strescape() does the same */
1775 if ((*f < ' ') || (*f >= 127)) {
1776 *(t++) = '\\';
1777 *(t++) = octchar((unsigned char) *f >> 6);
1778 *(t++) = octchar((unsigned char) *f >> 3);
1779 *(t++) = octchar((unsigned char) *f);
1780 } else
1781 *(t++) = *f;
1782 break;
1783 }
1784
1785 *t = 0;
1786
1787 return r;
1788}
1789
6febfd0d 1790char *cunescape_length(const char *s, size_t length) {
4fe88d28
LP		 1791 char *r, *t;
1792 const char *f;
1793
1794 assert(s);
1795
1796 /* Undoes C style string escaping */
1797
6febfd0d 1798 if (!(r = new(char, length+1)))
4fe88d28
LP		 1799 return r;
1800
6febfd0d 1801 for (f = s, t = r; f < s + length; f++) {
4fe88d28
LP		 1802
1803 if (*f != '\\') {
1804 *(t++) = *f;
1805 continue;
1806 }
1807
1808 f++;
1809
1810 switch (*f) {
1811
1812 case 'a':
1813 *(t++) = '\a';
1814 break;
1815 case 'b':
1816 *(t++) = '\b';
1817 break;
1818 case 'f':
1819 *(t++) = '\f';
1820 break;
1821 case 'n':
1822 *(t++) = '\n';
1823 break;
1824 case 'r':
1825 *(t++) = '\r';
1826 break;
1827 case 't':
1828 *(t++) = '\t';
1829 break;
1830 case 'v':
1831 *(t++) = '\v';
1832 break;
1833 case '\\':
1834 *(t++) = '\\';
1835 break;
1836 case '"':
1837 *(t++) = '"';
1838 break;
1839 case '\'':
1840 *(t++) = '\'';
1841 break;
1842
e167fb86
LP		 1843 case 's':
1844 /* This is an extension of the XDG syntax files */
1845 *(t++) = ' ';
1846 break;
1847
4fe88d28
LP		 1848 case 'x': {
1849 /* hexadecimal encoding */
1850 int a, b;
1851
1852 if ((a = unhexchar(f[1])) < 0 ||
1853 (b = unhexchar(f[2])) < 0) {
1854 /* Invalid escape code, let's take it literal then */
1855 *(t++) = '\\';
1856 *(t++) = 'x';
1857 } else {
1858 *(t++) = (char) ((a << 4) | b);
1859 f += 2;
1860 }
1861
1862 break;
1863 }
1864
1865 case '0':
1866 case '1':
1867 case '2':
1868 case '3':
1869 case '4':
1870 case '5':
1871 case '6':
1872 case '7': {
1873 /* octal encoding */
1874 int a, b, c;
1875
1876 if ((a = unoctchar(f[0])) < 0 ||
1877 (b = unoctchar(f[1])) < 0 ||
1878 (c = unoctchar(f[2])) < 0) {
1879 /* Invalid escape code, let's take it literal then */
1880 *(t++) = '\\';
1881 *(t++) = f[0];
1882 } else {
1883 *(t++) = (char) ((a << 6) | (b << 3) | c);
1884 f += 2;
1885 }
1886
1887 break;
1888 }
1889
1890 case 0:
1891 /* premature end of string.*/
1892 *(t++) = '\\';
1893 goto finish;
1894
1895 default:
1896 /* Invalid escape code, let's take it literal then */
1897 *(t++) = '\\';
f3d4cc01 1898 *(t++) = *f;
4fe88d28
LP		 1899 break;
1900 }
1901 }
1902
1903finish:
1904 *t = 0;
1905 return r;
1906}
1907
6febfd0d
LP		 1908char *cunescape(const char *s) {
1909 return cunescape_length(s, strlen(s));
1910}
4fe88d28
LP		 1911
1912char *xescape(const char *s, const char *bad) {
1913 char *r, *t;
1914 const char *f;
1915
1916 /* Escapes all chars in bad, in addition to \ and all special
1917 * chars, in \xFF style escaping. May be reversed with
1918 * cunescape. */
1919
1920 if (!(r = new(char, strlen(s)*4+1)))
1921 return NULL;
1922
1923 for (f = s, t = r; *f; f++) {
1924
b866264a
LP		 1925 if ((*f < ' ') || (*f >= 127) ||
1926 (*f == '\\') || strchr(bad, *f)) {
4fe88d28
LP		 1927 *(t++) = '\\';
1928 *(t++) = 'x';
1929 *(t++) = hexchar(*f >> 4);
1930 *(t++) = hexchar(*f);
1931 } else
1932 *(t++) = *f;
1933 }
1934
1935 *t = 0;
1936
1937 return r;
1938}
1939
ea430986 1940char *bus_path_escape(const char *s) {
ea430986
LP		 1941 char *r, *t;
1942 const char *f;
1943
47be870b
LP		 1944 assert(s);
1945
ea430986
LP		 1946 /* Escapes all chars that D-Bus' object path cannot deal
1947 * with. Can be reverse with bus_path_unescape() */
1948
1949 if (!(r = new(char, strlen(s)*3+1)))
1950 return NULL;
1951
1952 for (f = s, t = r; *f; f++) {
1953
1954 if (!(*f >= 'A' && *f <= 'Z') &&
1955 !(*f >= 'a' && *f <= 'z') &&
1956 !(*f >= '0' && *f <= '9')) {
1957 *(t++) = '_';
1958 *(t++) = hexchar(*f >> 4);
1959 *(t++) = hexchar(*f);
1960 } else
1961 *(t++) = *f;
1962 }
1963
1964 *t = 0;
1965
1966 return r;
1967}
1968
9e2f7c11 1969char *bus_path_unescape(const char *f) {
ea430986 1970 char *r, *t;
ea430986 1971
9e2f7c11 1972 assert(f);
47be870b 1973
9e2f7c11 1974 if (!(r = strdup(f)))
ea430986
LP		 1975 return NULL;
1976
9e2f7c11 1977 for (t = r; *f; f++) {
ea430986
LP		 1978
1979 if (*f == '_') {
1980 int a, b;
1981
1982 if ((a = unhexchar(f[1])) < 0 ||
1983 (b = unhexchar(f[2])) < 0) {
1984 /* Invalid escape code, let's take it literal then */
1985 *(t++) = '_';
1986 } else {
1987 *(t++) = (char) ((a << 4) | b);
1988 f += 2;
1989 }
1990 } else
1991 *(t++) = *f;
1992 }
1993
1994 *t = 0;
1995
1996 return r;
1997}
1998
4fe88d28
LP		 1999char *path_kill_slashes(char *path) {
2000 char *f, *t;
2001 bool slash = false;
2002
2003 /* Removes redundant inner and trailing slashes. Modifies the
2004 * passed string in-place.
2005 *
2006 * ///foo///bar/ becomes /foo/bar
2007 */
2008
2009 for (f = path, t = path; *f; f++) {
2010
2011 if (*f == '/') {
2012 slash = true;
2013 continue;
2014 }
2015
2016 if (slash) {
2017 slash = false;
2018 *(t++) = '/';
2019 }
2020
2021 *(t++) = *f;
2022 }
2023
2024 /* Special rule, if we are talking of the root directory, a
2025 trailing slash is good */
2026
2027 if (t == path && slash)
2028 *(t++) = '/';
2029
2030 *t = 0;
2031 return path;
2032}
2033
2034bool path_startswith(const char *path, const char *prefix) {
2035 assert(path);
2036 assert(prefix);
2037
2038 if ((path[0] == '/') != (prefix[0] == '/'))
2039 return false;
2040
2041 for (;;) {
2042 size_t a, b;
2043
2044 path += strspn(path, "/");
2045 prefix += strspn(prefix, "/");
2046
2047 if (*prefix == 0)
2048 return true;
2049
2050 if (*path == 0)
2051 return false;
2052
2053 a = strcspn(path, "/");
2054 b = strcspn(prefix, "/");
2055
2056 if (a != b)
2057 return false;
2058
2059 if (memcmp(path, prefix, a) != 0)
2060 return false;
2061
2062 path += a;
2063 prefix += b;
2064 }
2065}
2066
15ae422b
LP		 2067bool path_equal(const char *a, const char *b) {
2068 assert(a);
2069 assert(b);
2070
2071 if ((a[0] == '/') != (b[0] == '/'))
2072 return false;
2073
2074 for (;;) {
2075 size_t j, k;
2076
2077 a += strspn(a, "/");
2078 b += strspn(b, "/");
2079
2080 if (*a == 0 && *b == 0)
2081 return true;
2082
2083 if (*a == 0 || *b == 0)
2084 return false;
2085
2086 j = strcspn(a, "/");
2087 k = strcspn(b, "/");
2088
2089 if (j != k)
2090 return false;
2091
2092 if (memcmp(a, b, j) != 0)
2093 return false;
2094
2095 a += j;
2096 b += k;
2097 }
2098}
2099
67d51650 2100char *ascii_strlower(char *t) {
4fe88d28
LP		 2101 char *p;
2102
67d51650 2103 assert(t);
4fe88d28 2104
67d51650 2105 for (p = t; *p; p++)
4fe88d28
LP		 2106 if (*p >= 'A' && *p <= 'Z')
2107 *p = *p - 'A' + 'a';
2108
67d51650 2109 return t;
4fe88d28 2110}
1dccbe19 2111
c85dc17b
LP		 2112bool ignore_file(const char *filename) {
2113 assert(filename);
2114
2115 return
2116 filename[0] == '.' ||
6c78be3c 2117 streq(filename, "lost+found") ||
e472d476
LP		 2118 streq(filename, "aquota.user") ||
2119 streq(filename, "aquota.group") ||
c85dc17b
LP		 2120 endswith(filename, "~") ||
2121 endswith(filename, ".rpmnew") ||
2122 endswith(filename, ".rpmsave") ||
2123 endswith(filename, ".rpmorig") ||
2124 endswith(filename, ".dpkg-old") ||
2125 endswith(filename, ".dpkg-new") ||
2126 endswith(filename, ".swp");
2127}
2128
3a0ecb08
LP		 2129int fd_nonblock(int fd, bool nonblock) {
2130 int flags;
2131
2132 assert(fd >= 0);
2133
2134 if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
2135 return -errno;
2136
2137 if (nonblock)
2138 flags |= O_NONBLOCK;
2139 else
2140 flags &= ~O_NONBLOCK;
2141
2142 if (fcntl(fd, F_SETFL, flags) < 0)
2143 return -errno;
2144
2145 return 0;
2146}
2147
2148int fd_cloexec(int fd, bool cloexec) {
2149 int flags;
2150
2151 assert(fd >= 0);
2152
2153 if ((flags = fcntl(fd, F_GETFD, 0)) < 0)
2154 return -errno;
2155
2156 if (cloexec)
2157 flags |= FD_CLOEXEC;
2158 else
2159 flags &= ~FD_CLOEXEC;
2160
2161 if (fcntl(fd, F_SETFD, flags) < 0)
2162 return -errno;
2163
2164 return 0;
2165}
2166
a0d40ac5
LP		 2167int close_all_fds(const int except[], unsigned n_except) {
2168 DIR *d;
2169 struct dirent *de;
2170 int r = 0;
2171
2172 if (!(d = opendir("/proc/self/fd")))
2173 return -errno;
2174
2175 while ((de = readdir(d))) {
a7610064 2176 int fd = -1;
a0d40ac5 2177
a16e1123 2178 if (ignore_file(de->d_name))
a0d40ac5
LP		 2179 continue;
2180
720ce21d
LP		 2181 if (safe_atoi(de->d_name, &fd) < 0)
2182 /* Let's better ignore this, just in case */
2183 continue;
a0d40ac5
LP		 2184
2185 if (fd < 3)
2186 continue;
2187
2188 if (fd == dirfd(d))
2189 continue;
2190
2191 if (except) {
2192 bool found;
2193 unsigned i;
2194
2195 found = false;
2196 for (i = 0; i < n_except; i++)
2197 if (except[i] == fd) {
2198 found = true;
2199 break;
2200 }
2201
2202 if (found)
2203 continue;
2204 }
2205
720ce21d 2206 if (close_nointr(fd) < 0) {
2f357920 2207 /* Valgrind has its own FD and doesn't want to have it closed */
720ce21d
LP		 2208 if (errno != EBADF && r == 0)
2209 r = -errno;
2f357920 2210 }
a0d40ac5
LP		 2211 }
2212
a0d40ac5
LP		 2213 closedir(d);
2214 return r;
2215}
2216
db12775d
LP		 2217bool chars_intersect(const char *a, const char *b) {
2218 const char *p;
2219
2220 /* Returns true if any of the chars in a are in b. */
2221 for (p = a; *p; p++)
2222 if (strchr(b, *p))
2223 return true;
2224
2225 return false;
2226}
2227
8b6c7120
LP		 2228char *format_timestamp(char *buf, size_t l, usec_t t) {
2229 struct tm tm;
2230 time_t sec;
2231
2232 assert(buf);
2233 assert(l > 0);
2234
2235 if (t <= 0)
2236 return NULL;
2237
f872ec33 2238 sec = (time_t) (t / USEC_PER_SEC);
8b6c7120
LP		 2239
2240 if (strftime(buf, l, "%a, %d %b %Y %H:%M:%S %z", localtime_r(&sec, &tm)) <= 0)
2241 return NULL;
2242
2243 return buf;
2244}
2245
584be568
LP		 2246char *format_timestamp_pretty(char *buf, size_t l, usec_t t) {
2247 usec_t n, d;
2248
2249 n = now(CLOCK_REALTIME);
2250
2251 if (t <= 0 || t > n || t + USEC_PER_DAY*7 <= t)
2252 return NULL;
2253
2254 d = n - t;
2255
2256 if (d >= USEC_PER_YEAR)
2257 snprintf(buf, l, "%llu years and %llu months ago",
2258 (unsigned long long) (d / USEC_PER_YEAR),
2259 (unsigned long long) ((d % USEC_PER_YEAR) / USEC_PER_MONTH));
2260 else if (d >= USEC_PER_MONTH)
2261 snprintf(buf, l, "%llu months and %llu days ago",
2262 (unsigned long long) (d / USEC_PER_MONTH),
2263 (unsigned long long) ((d % USEC_PER_MONTH) / USEC_PER_DAY));
2264 else if (d >= USEC_PER_WEEK)
2265 snprintf(buf, l, "%llu weeks and %llu days ago",
2266 (unsigned long long) (d / USEC_PER_WEEK),
2267 (unsigned long long) ((d % USEC_PER_WEEK) / USEC_PER_DAY));
2268 else if (d >= 2*USEC_PER_DAY)
2269 snprintf(buf, l, "%llu days ago", (unsigned long long) (d / USEC_PER_DAY));
2270 else if (d >= 25*USEC_PER_HOUR)
2271 snprintf(buf, l, "1 day and %lluh ago",
2272 (unsigned long long) ((d - USEC_PER_DAY) / USEC_PER_HOUR));
2273 else if (d >= 6*USEC_PER_HOUR)
2274 snprintf(buf, l, "%lluh ago",
2275 (unsigned long long) (d / USEC_PER_HOUR));
2276 else if (d >= USEC_PER_HOUR)
2277 snprintf(buf, l, "%lluh %llumin ago",
2278 (unsigned long long) (d / USEC_PER_HOUR),
2279 (unsigned long long) ((d % USEC_PER_HOUR) / USEC_PER_MINUTE));
2280 else if (d >= 5*USEC_PER_MINUTE)
2281 snprintf(buf, l, "%llumin ago",
2282 (unsigned long long) (d / USEC_PER_MINUTE));
2283 else if (d >= USEC_PER_MINUTE)
2284 snprintf(buf, l, "%llumin %llus ago",
2285 (unsigned long long) (d / USEC_PER_MINUTE),
2286 (unsigned long long) ((d % USEC_PER_MINUTE) / USEC_PER_SEC));
2287 else if (d >= USEC_PER_SEC)
2288 snprintf(buf, l, "%llus ago",
2289 (unsigned long long) (d / USEC_PER_SEC));
2290 else if (d >= USEC_PER_MSEC)
2291 snprintf(buf, l, "%llums ago",
2292 (unsigned long long) (d / USEC_PER_MSEC));
2293 else if (d > 0)
2294 snprintf(buf, l, "%lluus ago",
2295 (unsigned long long) d);
2296 else
2297 snprintf(buf, l, "now");
2298
2299 buf[l-1] = 0;
2300 return buf;
2301}
2302
871d7de4
LP		 2303char *format_timespan(char *buf, size_t l, usec_t t) {
2304 static const struct {
2305 const char *suffix;
2306 usec_t usec;
2307 } table[] = {
2308 { "w", USEC_PER_WEEK },
2309 { "d", USEC_PER_DAY },
2310 { "h", USEC_PER_HOUR },
2311 { "min", USEC_PER_MINUTE },
2312 { "s", USEC_PER_SEC },
2313 { "ms", USEC_PER_MSEC },
2314 { "us", 1 },
2315 };
2316
2317 unsigned i;
2318 char *p = buf;
2319
2320 assert(buf);
2321 assert(l > 0);
2322
2323 if (t == (usec_t) -1)
2324 return NULL;
2325
4502d22c
LP		 2326 if (t == 0) {
2327 snprintf(p, l, "0");
2328 p[l-1] = 0;
2329 return p;
2330 }
2331
871d7de4
LP		 2332 /* The result of this function can be parsed with parse_usec */
2333
2334 for (i = 0; i < ELEMENTSOF(table); i++) {
2335 int k;
2336 size_t n;
2337
2338 if (t < table[i].usec)
2339 continue;
2340
2341 if (l <= 1)
2342 break;
2343
2344 k = snprintf(p, l, "%s%llu%s", p > buf ? " " : "", (unsigned long long) (t / table[i].usec), table[i].suffix);
2345 n = MIN((size_t) k, l);
2346
2347 l -= n;
2348 p += n;
2349
2350 t %= table[i].usec;
2351 }
2352
2353 *p = 0;
2354
2355 return buf;
2356}
2357
42856c10
LP		 2358bool fstype_is_network(const char *fstype) {
2359 static const char * const table[] = {
2360 "cifs",
2361 "smbfs",
2362 "ncpfs",
2363 "nfs",
ca139f94
LP		 2364 "nfs4",
2365 "gfs",
2366 "gfs2"
42856c10
LP		 2367 };
2368
2369 unsigned i;
2370
2371 for (i = 0; i < ELEMENTSOF(table); i++)
2372 if (streq(table[i], fstype))
2373 return true;
2374
2375 return false;
2376}
2377
601f6a1e
LP		 2378int chvt(int vt) {
2379 int fd, r = 0;
2380
74bc3bdc 2381 if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0)
601f6a1e
LP		 2382 return -errno;
2383
2384 if (vt < 0) {
2385 int tiocl[2] = {
2386 TIOCL_GETKMSGREDIRECT,
2387 0
2388 };
2389
678abaf9
TJ		 2390 if (ioctl(fd, TIOCLINUX, tiocl) < 0) {
2391 r = -errno;
2392 goto fail;
2393 }
601f6a1e
LP		 2394
2395 vt = tiocl[0] <= 0 ? 1 : tiocl[0];
2396 }
2397
2398 if (ioctl(fd, VT_ACTIVATE, vt) < 0)
2399 r = -errno;
2400
678abaf9
TJ		 2401fail:
2402 close_nointr_nofail(fd);
601f6a1e
LP		 2403 return r;
2404}
2405
80876c20
LP		 2406int read_one_char(FILE *f, char *ret, bool *need_nl) {
2407 struct termios old_termios, new_termios;
2408 char c;
20c03b7b 2409 char line[LINE_MAX];
80876c20
LP		 2410
2411 assert(f);
2412 assert(ret);
2413
2414 if (tcgetattr(fileno(f), &old_termios) >= 0) {
2415 new_termios = old_termios;
2416
2417 new_termios.c_lflag &= ~ICANON;
2418 new_termios.c_cc[VMIN] = 1;
2419 new_termios.c_cc[VTIME] = 0;
2420
2421 if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
2422 size_t k;
2423
2424 k = fread(&c, 1, 1, f);
2425
2426 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
2427
2428 if (k <= 0)
2429 return -EIO;
2430
2431 if (need_nl)
2432 *need_nl = c != '\n';
2433
2434 *ret = c;
2435 return 0;
2436 }
2437 }
2438
2439 if (!(fgets(line, sizeof(line), f)))
2440 return -EIO;
2441
2442 truncate_nl(line);
2443
2444 if (strlen(line) != 1)
2445 return -EBADMSG;
2446
2447 if (need_nl)
2448 *need_nl = false;
2449
2450 *ret = line[0];
2451 return 0;
2452}
2453
2454int ask(char *ret, const char *replies, const char *text, ...) {
1b39d4b9
LP		 2455 bool on_tty;
2456
80876c20
LP		 2457 assert(ret);
2458 assert(replies);
2459 assert(text);
2460
1b39d4b9
LP		 2461 on_tty = isatty(STDOUT_FILENO);
2462
80876c20
LP		 2463 for (;;) {
2464 va_list ap;
2465 char c;
2466 int r;
2467 bool need_nl = true;
2468
1b39d4b9 2469 if (on_tty)
c1072ea0 2470 fputs(ANSI_HIGHLIGHT_ON, stdout);
b1b2dc0c 2471
80876c20
LP		 2472 va_start(ap, text);
2473 vprintf(text, ap);
2474 va_end(ap);
2475
1b39d4b9 2476 if (on_tty)
c1072ea0 2477 fputs(ANSI_HIGHLIGHT_OFF, stdout);
b1b2dc0c 2478
80876c20
LP		 2479 fflush(stdout);
2480
2481 if ((r = read_one_char(stdin, &c, &need_nl)) < 0) {
2482
2483 if (r == -EBADMSG) {
2484 puts("Bad input, please try again.");
2485 continue;
2486 }
2487
2488 putchar('\n');
2489 return r;
2490 }
2491
2492 if (need_nl)
2493 putchar('\n');
2494
2495 if (strchr(replies, c)) {
2496 *ret = c;
2497 return 0;
2498 }
2499
2500 puts("Read unexpected character, please try again.");
2501 }
2502}
2503
6ea832a2 2504int reset_terminal_fd(int fd) {
80876c20
LP		 2505 struct termios termios;
2506 int r = 0;
3fe5e5d4
LP		 2507
2508 /* Set terminal to some sane defaults */
80876c20
LP		 2509
2510 assert(fd >= 0);
2511
eed1d0e3
LP		 2512 /* We leave locked terminal attributes untouched, so that
2513 * Plymouth may set whatever it wants to set, and we don't
2514 * interfere with that. */
3fe5e5d4
LP		 2515
2516 /* Disable exclusive mode, just in case */
2517 ioctl(fd, TIOCNXCL);
2518
5c0100a5
MS		 2519 /* Switch to text mode */
2520 ioctl(fd, KDSETMODE, KD_TEXT);
2521
3fe5e5d4 2522 /* Enable console unicode mode */
df465b3f 2523 ioctl(fd, KDSKBMODE, K_UNICODE);
80876c20
LP		 2524
2525 if (tcgetattr(fd, &termios) < 0) {
2526 r = -errno;
2527 goto finish;
2528 }
2529
aaf694ca
LP		 2530 /* We only reset the stuff that matters to the software. How
2531 * hardware is set up we don't touch assuming that somebody
2532 * else will do that for us */
2533
2534 termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
80876c20
LP		 2535 termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
2536 termios.c_oflag |= ONLCR;
2537 termios.c_cflag |= CREAD;
2538 termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
2539
2540 termios.c_cc[VINTR] = 03; /* ^C */
2541 termios.c_cc[VQUIT] = 034; /* ^\ */
2542 termios.c_cc[VERASE] = 0177;
2543 termios.c_cc[VKILL] = 025; /* ^X */
2544 termios.c_cc[VEOF] = 04; /* ^D */
2545 termios.c_cc[VSTART] = 021; /* ^Q */
2546 termios.c_cc[VSTOP] = 023; /* ^S */
2547 termios.c_cc[VSUSP] = 032; /* ^Z */
2548 termios.c_cc[VLNEXT] = 026; /* ^V */
2549 termios.c_cc[VWERASE] = 027; /* ^W */
2550 termios.c_cc[VREPRINT] = 022; /* ^R */
aaf694ca
LP		 2551 termios.c_cc[VEOL] = 0;
2552 termios.c_cc[VEOL2] = 0;
80876c20
LP		 2553
2554 termios.c_cc[VTIME] = 0;
2555 termios.c_cc[VMIN] = 1;
2556
2557 if (tcsetattr(fd, TCSANOW, &termios) < 0)
2558 r = -errno;
2559
2560finish:
2561 /* Just in case, flush all crap out */
2562 tcflush(fd, TCIOFLUSH);
2563
2564 return r;
2565}
2566
6ea832a2
LP		 2567int reset_terminal(const char *name) {
2568 int fd, r;
2569
2570 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
2571 if (fd < 0)
2572 return fd;
2573
2574 r = reset_terminal_fd(fd);
2575 close_nointr_nofail(fd);
2576
2577 return r;
2578}
2579
80876c20
LP		 2580int open_terminal(const char *name, int mode) {
2581 int fd, r;
f73f76ac 2582 unsigned c = 0;
80876c20 2583
f73f76ac
LP		 2584 /*
2585 * If a TTY is in the process of being closed opening it might
2586 * cause EIO. This is horribly awful, but unlikely to be
2587 * changed in the kernel. Hence we work around this problem by
2588 * retrying a couple of times.
2589 *
2590 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
2591 */
2592
2593 for (;;) {
2594 if ((fd = open(name, mode)) >= 0)
2595 break;
2596
2597 if (errno != EIO)
2598 return -errno;
2599
2600 if (c >= 20)
2601 return -errno;
2602
2603 usleep(50 * USEC_PER_MSEC);
2604 c++;
2605 }
2606
2607 if (fd < 0)
80876c20
LP		 2608 return -errno;
2609
2610 if ((r = isatty(fd)) < 0) {
2611 close_nointr_nofail(fd);
2612 return -errno;
2613 }
2614
2615 if (!r) {
2616 close_nointr_nofail(fd);
2617 return -ENOTTY;
2618 }
2619
2620 return fd;
2621}
2622
2623int flush_fd(int fd) {
2624 struct pollfd pollfd;
2625
2626 zero(pollfd);
2627 pollfd.fd = fd;
2628 pollfd.events = POLLIN;
2629
2630 for (;;) {
20c03b7b 2631 char buf[LINE_MAX];
80876c20
LP		 2632 ssize_t l;
2633 int r;
2634
2635 if ((r = poll(&pollfd, 1, 0)) < 0) {
2636
2637 if (errno == EINTR)
2638 continue;
2639
2640 return -errno;
2641 }
2642
2643 if (r == 0)
2644 return 0;
2645
2646 if ((l = read(fd, buf, sizeof(buf))) < 0) {
2647
2648 if (errno == EINTR)
2649 continue;
2650
2651 if (errno == EAGAIN)
2652 return 0;
2653
2654 return -errno;
2655 }
2656
2657 if (l <= 0)
2658 return 0;
2659 }
2660}
2661
21de3988 2662int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm) {
bab45044 2663 int fd = -1, notify = -1, r, wd = -1;
80876c20
LP		 2664
2665 assert(name);
2666
2667 /* We use inotify to be notified when the tty is closed. We
2668 * create the watch before checking if we can actually acquire
2669 * it, so that we don't lose any event.
2670 *
2671 * Note: strictly speaking this actually watches for the
2672 * device being closed, it does *not* really watch whether a
2673 * tty loses its controlling process. However, unless some
2674 * rogue process uses TIOCNOTTY on /dev/tty *after* closing
2675 * its tty otherwise this will not become a problem. As long
2676 * as the administrator makes sure not configure any service
2677 * on the same tty as an untrusted user this should not be a
2678 * problem. (Which he probably should not do anyway.) */
2679
2680 if (!fail && !force) {
2681 if ((notify = inotify_init1(IN_CLOEXEC)) < 0) {
2682 r = -errno;
2683 goto fail;
2684 }
2685
2686 if ((wd = inotify_add_watch(notify, name, IN_CLOSE)) < 0) {
2687 r = -errno;
2688 goto fail;
2689 }
2690 }
2691
2692 for (;;) {
e3d1855b
LP		 2693 if (notify >= 0)
2694 if ((r = flush_fd(notify)) < 0)
2695 goto fail;
80876c20
LP		 2696
2697 /* We pass here O_NOCTTY only so that we can check the return
2698 * value TIOCSCTTY and have a reliable way to figure out if we
2699 * successfully became the controlling process of the tty */
6ea832a2
LP		 2700 if ((fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0)
2701 return fd;
80876c20
LP		 2702
2703 /* First, try to get the tty */
21de3988
LP		 2704 r = ioctl(fd, TIOCSCTTY, force);
2705
2706 /* Sometimes it makes sense to ignore TIOCSCTTY
2707 * returning EPERM, i.e. when very likely we already
2708 * are have this controlling terminal. */
2709 if (r < 0 && errno == EPERM && ignore_tiocstty_eperm)
2710 r = 0;
2711
2712 if (r < 0 && (force || fail || errno != EPERM)) {
80876c20
LP		 2713 r = -errno;
2714 goto fail;
2715 }
2716
2717 if (r >= 0)
2718 break;
2719
2720 assert(!fail);
2721 assert(!force);
2722 assert(notify >= 0);
2723
2724 for (;;) {
f601daa7 2725 uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
80876c20 2726 ssize_t l;
f601daa7 2727 struct inotify_event *e;
80876c20 2728
50f20cfd 2729 if ((l = read(notify, inotify_buffer, sizeof(inotify_buffer))) < 0) {
80876c20 2730
f601daa7
LP		 2731 if (errno == EINTR)
2732 continue;
2733
2734 r = -errno;
2735 goto fail;
2736 }
2737
2738 e = (struct inotify_event*) inotify_buffer;
80876c20 2739
f601daa7
LP		 2740 while (l > 0) {
2741 size_t step;
80876c20 2742
f601daa7 2743 if (e->wd != wd || !(e->mask & IN_CLOSE)) {
80876c20 2744 r = -EIO;
f601daa7
LP		 2745 goto fail;
2746 }
80876c20 2747
f601daa7
LP		 2748 step = sizeof(struct inotify_event) + e->len;
2749 assert(step <= (size_t) l);
80876c20 2750
f601daa7
LP		 2751 e = (struct inotify_event*) ((uint8_t*) e + step);
2752 l -= step;
80876c20
LP		 2753 }
2754
2755 break;
2756 }
2757
2758 /* We close the tty fd here since if the old session
2759 * ended our handle will be dead. It's important that
2760 * we do this after sleeping, so that we don't enter
2761 * an endless loop. */
2762 close_nointr_nofail(fd);
2763 }
2764
2765 if (notify >= 0)
a16e1123 2766 close_nointr_nofail(notify);
80876c20 2767
6ea832a2 2768 if ((r = reset_terminal_fd(fd)) < 0)
80876c20
LP		 2769 log_warning("Failed to reset terminal: %s", strerror(-r));
2770
2771 return fd;
2772
2773fail:
2774 if (fd >= 0)
a16e1123 2775 close_nointr_nofail(fd);
80876c20
LP		 2776
2777 if (notify >= 0)
a16e1123 2778 close_nointr_nofail(notify);
80876c20
LP		 2779
2780 return r;
2781}
2782
2783int release_terminal(void) {
2784 int r = 0, fd;
57cd2192 2785 struct sigaction sa_old, sa_new;
80876c20 2786
ccaa6149 2787 if ((fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC)) < 0)
80876c20
LP		 2788 return -errno;
2789
57cd2192
LP		 2790 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
2791 * by our own TIOCNOTTY */
2792
2793 zero(sa_new);
2794 sa_new.sa_handler = SIG_IGN;
2795 sa_new.sa_flags = SA_RESTART;
2796 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
2797
80876c20
LP		 2798 if (ioctl(fd, TIOCNOTTY) < 0)
2799 r = -errno;
2800
57cd2192
LP		 2801 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
2802
80876c20
LP		 2803 close_nointr_nofail(fd);
2804 return r;
2805}
2806
9a34ec5f
LP		 2807int sigaction_many(const struct sigaction *sa, ...) {
2808 va_list ap;
2809 int r = 0, sig;
2810
2811 va_start(ap, sa);
2812 while ((sig = va_arg(ap, int)) > 0)
2813 if (sigaction(sig, sa, NULL) < 0)
2814 r = -errno;
2815 va_end(ap);
2816
2817 return r;
2818}
2819
2820int ignore_signals(int sig, ...) {
a337c6fc 2821 struct sigaction sa;
9a34ec5f
LP		 2822 va_list ap;
2823 int r = 0;
a337c6fc
LP		 2824
2825 zero(sa);
2826 sa.sa_handler = SIG_IGN;
2827 sa.sa_flags = SA_RESTART;
2828
9a34ec5f
LP		 2829 if (sigaction(sig, &sa, NULL) < 0)
2830 r = -errno;
2831
2832 va_start(ap, sig);
2833 while ((sig = va_arg(ap, int)) > 0)
2834 if (sigaction(sig, &sa, NULL) < 0)
2835 r = -errno;
2836 va_end(ap);
2837
2838 return r;
2839}
2840
2841int default_signals(int sig, ...) {
2842 struct sigaction sa;
2843 va_list ap;
2844 int r = 0;
2845
2846 zero(sa);
2847 sa.sa_handler = SIG_DFL;
2848 sa.sa_flags = SA_RESTART;
2849
2850 if (sigaction(sig, &sa, NULL) < 0)
2851 r = -errno;
2852
2853 va_start(ap, sig);
2854 while ((sig = va_arg(ap, int)) > 0)
2855 if (sigaction(sig, &sa, NULL) < 0)
2856 r = -errno;
2857 va_end(ap);
2858
2859 return r;
a337c6fc
LP		 2860}
2861
8d567588
LP		 2862int close_pipe(int p[]) {
2863 int a = 0, b = 0;
2864
2865 assert(p);
2866
2867 if (p[0] >= 0) {
2868 a = close_nointr(p[0]);
2869 p[0] = -1;
2870 }
2871
2872 if (p[1] >= 0) {
2873 b = close_nointr(p[1]);
2874 p[1] = -1;
2875 }
2876
2877 return a < 0 ? a : b;
2878}
2879
eb22ac37 2880ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) {
8d567588
LP		 2881 uint8_t *p;
2882 ssize_t n = 0;
2883
2884 assert(fd >= 0);
2885 assert(buf);
2886
2887 p = buf;
2888
2889 while (nbytes > 0) {
2890 ssize_t k;
2891
2892 if ((k = read(fd, p, nbytes)) <= 0) {
2893
eb22ac37 2894 if (k < 0 && errno == EINTR)
8d567588
LP		 2895 continue;
2896
eb22ac37 2897 if (k < 0 && errno == EAGAIN && do_poll) {
8d567588
LP		 2898 struct pollfd pollfd;
2899
2900 zero(pollfd);
2901 pollfd.fd = fd;
2902 pollfd.events = POLLIN;
2903
2904 if (poll(&pollfd, 1, -1) < 0) {
2905 if (errno == EINTR)
2906 continue;
2907
2908 return n > 0 ? n : -errno;
2909 }
2910
2911 if (pollfd.revents != POLLIN)
2912 return n > 0 ? n : -EIO;
2913
2914 continue;
2915 }
2916
2917 return n > 0 ? n : (k < 0 ? -errno : 0);
2918 }
2919
2920 p += k;
2921 nbytes -= k;
2922 n += k;
2923 }
2924
2925 return n;
2926}
2927
eb22ac37
LP		 2928ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) {
2929 const uint8_t *p;
2930 ssize_t n = 0;
2931
2932 assert(fd >= 0);
2933 assert(buf);
2934
2935 p = buf;
2936
2937 while (nbytes > 0) {
2938 ssize_t k;
2939
fe652127
LP		 2940 k = write(fd, p, nbytes);
2941 if (k <= 0) {
eb22ac37
LP		 2942
2943 if (k < 0 && errno == EINTR)
2944 continue;
2945
2946 if (k < 0 && errno == EAGAIN && do_poll) {
2947 struct pollfd pollfd;
2948
2949 zero(pollfd);
2950 pollfd.fd = fd;
2951 pollfd.events = POLLOUT;
2952
2953 if (poll(&pollfd, 1, -1) < 0) {
2954 if (errno == EINTR)
2955 continue;
2956
2957 return n > 0 ? n : -errno;
2958 }
2959
2960 if (pollfd.revents != POLLOUT)
2961 return n > 0 ? n : -EIO;
2962
2963 continue;
2964 }
2965
2966 return n > 0 ? n : (k < 0 ? -errno : 0);
2967 }
2968
2969 p += k;
2970 nbytes -= k;
2971 n += k;
2972 }
2973
2974 return n;
2975}
2976
0c85a4f3 2977int path_is_mount_point(const char *t, bool allow_symlink) {
8d567588 2978 struct stat a, b;
35d2e7ec
LP		 2979 char *parent;
2980 int r;
8d567588 2981
0c85a4f3
LP		 2982 if (allow_symlink)
2983 r = stat(t, &a);
2984 else
2985 r = lstat(t, &a);
2986
2987 if (r < 0) {
8d567588
LP		 2988 if (errno == ENOENT)
2989 return 0;
2990
2991 return -errno;
2992 }
2993
0c85a4f3
LP		 2994 r = parent_of_path(t, &parent);
2995 if (r < 0)
35d2e7ec 2996 return r;
8d567588 2997
35d2e7ec
LP		 2998 r = lstat(parent, &b);
2999 free(parent);
8d567588 3000
35d2e7ec
LP		 3001 if (r < 0)
3002 return -errno;
8d567588
LP		 3003
3004 return a.st_dev != b.st_dev;
3005}
3006
24a6e4a4
LP		 3007int parse_usec(const char *t, usec_t *usec) {
3008 static const struct {
3009 const char *suffix;
3010 usec_t usec;
3011 } table[] = {
3012 { "sec", USEC_PER_SEC },
3013 { "s", USEC_PER_SEC },
3014 { "min", USEC_PER_MINUTE },
3015 { "hr", USEC_PER_HOUR },
3016 { "h", USEC_PER_HOUR },
3017 { "d", USEC_PER_DAY },
3018 { "w", USEC_PER_WEEK },
3019 { "msec", USEC_PER_MSEC },
3020 { "ms", USEC_PER_MSEC },
3021 { "m", USEC_PER_MINUTE },
3022 { "usec", 1ULL },
3023 { "us", 1ULL },
3024 { "", USEC_PER_SEC },
3025 };
3026
3027 const char *p;
3028 usec_t r = 0;
3029
3030 assert(t);
3031 assert(usec);
3032
3033 p = t;
3034 do {
3035 long long l;
3036 char *e;
3037 unsigned i;
3038
3039 errno = 0;
3040 l = strtoll(p, &e, 10);
3041
3042 if (errno != 0)
3043 return -errno;
3044
3045 if (l < 0)
3046 return -ERANGE;
3047
3048 if (e == p)
3049 return -EINVAL;
3050
3051 e += strspn(e, WHITESPACE);
3052
3053 for (i = 0; i < ELEMENTSOF(table); i++)
3054 if (startswith(e, table[i].suffix)) {
3055 r += (usec_t) l * table[i].usec;
3056 p = e + strlen(table[i].suffix);
3057 break;
3058 }
3059
3060 if (i >= ELEMENTSOF(table))
3061 return -EINVAL;
3062
3063 } while (*p != 0);
3064
3065 *usec = r;
3066
3067 return 0;
3068}
3069
ab1f0633
LP		 3070int parse_bytes(const char *t, off_t *bytes) {
3071 static const struct {
3072 const char *suffix;
3073 off_t factor;
3074 } table[] = {
3075 { "B", 1 },
3076 { "K", 1024ULL },
3077 { "M", 1024ULL*1024ULL },
3078 { "G", 1024ULL*1024ULL*1024ULL },
3079 { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
32895bb3
LP		 3080 { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
3081 { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
ab1f0633
LP		 3082 { "", 1 },
3083 };
3084
3085 const char *p;
3086 off_t r = 0;
3087
3088 assert(t);
3089 assert(bytes);
3090
3091 p = t;
3092 do {
3093 long long l;
3094 char *e;
3095 unsigned i;
3096
3097 errno = 0;
3098 l = strtoll(p, &e, 10);
3099
3100 if (errno != 0)
3101 return -errno;
3102
3103 if (l < 0)
3104 return -ERANGE;
3105
3106 if (e == p)
3107 return -EINVAL;
3108
3109 e += strspn(e, WHITESPACE);
3110
3111 for (i = 0; i < ELEMENTSOF(table); i++)
3112 if (startswith(e, table[i].suffix)) {
3113 r += (off_t) l * table[i].factor;
3114 p = e + strlen(table[i].suffix);
3115 break;
3116 }
3117
3118 if (i >= ELEMENTSOF(table))
3119 return -EINVAL;
3120
3121 } while (*p != 0);
3122
3123 *bytes = r;
3124
3125 return 0;
3126}
3127
843d2643
LP		 3128int make_stdio(int fd) {
3129 int r, s, t;
3130
3131 assert(fd >= 0);
3132
3133 r = dup2(fd, STDIN_FILENO);
3134 s = dup2(fd, STDOUT_FILENO);
3135 t = dup2(fd, STDERR_FILENO);
3136
3137 if (fd >= 3)
3138 close_nointr_nofail(fd);
3139
3140 if (r < 0 || s < 0 || t < 0)
3141 return -errno;
3142
7862f62d
LP		 3143 fd_cloexec(STDIN_FILENO, false);
3144 fd_cloexec(STDOUT_FILENO, false);
3145 fd_cloexec(STDERR_FILENO, false);
3146
843d2643
LP		 3147 return 0;
3148}
3149
ade509ce
LP		 3150int make_null_stdio(void) {
3151 int null_fd;
3152
3153 if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0)
3154 return -errno;
3155
3156 return make_stdio(null_fd);
3157}
3158
8407a5d0
LP		 3159bool is_device_path(const char *path) {
3160
3161 /* Returns true on paths that refer to a device, either in
3162 * sysfs or in /dev */
3163
3164 return
3165 path_startswith(path, "/dev/") ||
3166 path_startswith(path, "/sys/");
3167}
3168
01f78473
LP		 3169int dir_is_empty(const char *path) {
3170 DIR *d;
3171 int r;
3172 struct dirent buf, *de;
3173
3174 if (!(d = opendir(path)))
3175 return -errno;
3176
3177 for (;;) {
3178 if ((r = readdir_r(d, &buf, &de)) > 0) {
3179 r = -r;
3180 break;
3181 }
3182
3183 if (!de) {
3184 r = 1;
3185 break;
3186 }
3187
3188 if (!ignore_file(de->d_name)) {
3189 r = 0;
3190 break;
3191 }
3192 }
3193
3194 closedir(d);
3195 return r;
3196}
3197
d3782d60
LP		 3198unsigned long long random_ull(void) {
3199 int fd;
3200 uint64_t ull;
3201 ssize_t r;
3202
3203 if ((fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY)) < 0)
3204 goto fallback;
3205
eb22ac37 3206 r = loop_read(fd, &ull, sizeof(ull), true);
d3782d60
LP		 3207 close_nointr_nofail(fd);
3208
3209 if (r != sizeof(ull))
3210 goto fallback;
3211
3212 return ull;
3213
3214fallback:
3215 return random() * RAND_MAX + random();
3216}
3217
5b6319dc
LP		 3218void rename_process(const char name[8]) {
3219 assert(name);
3220
3221 prctl(PR_SET_NAME, name);
3222
3223 /* This is a like a poor man's setproctitle(). The string
3224 * passed should fit in 7 chars (i.e. the length of
3225 * "systemd") */
3226
3227 if (program_invocation_name)
3228 strncpy(program_invocation_name, name, strlen(program_invocation_name));
9a0e6896
LP		 3229
3230 if (saved_argc > 0) {
3231 int i;
3232
3233 if (saved_argv[0])
3234 strncpy(saved_argv[0], name, strlen(saved_argv[0]));
3235
3236 for (i = 1; i < saved_argc; i++) {
3237 if (!saved_argv[i])
3238 break;
3239
3240 memset(saved_argv[i], 0, strlen(saved_argv[i]));
3241 }
3242 }
5b6319dc
LP		 3243}
3244
7d793605
LP		 3245void sigset_add_many(sigset_t *ss, ...) {
3246 va_list ap;
3247 int sig;
3248
3249 assert(ss);
3250
3251 va_start(ap, ss);
3252 while ((sig = va_arg(ap, int)) > 0)
3253 assert_se(sigaddset(ss, sig) == 0);
3254 va_end(ap);
3255}
3256
ef2f1067
LP		 3257char* gethostname_malloc(void) {
3258 struct utsname u;
3259
3260 assert_se(uname(&u) >= 0);
3261
3262 if (u.nodename[0])
3263 return strdup(u.nodename);
3264
3265 return strdup(u.sysname);
3266}
3267
3268char* getlogname_malloc(void) {
3269 uid_t uid;
3270 long bufsize;
3271 char *buf, *name;
3272 struct passwd pwbuf, *pw = NULL;
3273 struct stat st;
3274
3275 if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0)
3276 uid = st.st_uid;
3277 else
3278 uid = getuid();
3279
3280 /* Shortcut things to avoid NSS lookups */
3281 if (uid == 0)
3282 return strdup("root");
3283
3284 if ((bufsize = sysconf(_SC_GETPW_R_SIZE_MAX)) <= 0)
3285 bufsize = 4096;
3286
3287 if (!(buf = malloc(bufsize)))
3288 return NULL;
3289
3290 if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw) {
3291 name = strdup(pw->pw_name);
3292 free(buf);
3293 return name;
3294 }
3295
3296 free(buf);
3297
3298 if (asprintf(&name, "%lu", (unsigned long) uid) < 0)
3299 return NULL;
3300
3301 return name;
3302}
3303
fc116c6a
LP		 3304int getttyname_malloc(int fd, char **r) {
3305 char path[PATH_MAX], *c;
618e02c7 3306 int k;
8c6db833
LP		 3307
3308 assert(r);
ef2f1067 3309
fc116c6a 3310 if ((k = ttyname_r(fd, path, sizeof(path))) != 0)
618e02c7 3311 return -k;
ef2f1067
LP		 3312
3313 char_array_0(path);
3314
fc116c6a 3315 if (!(c = strdup(startswith(path, "/dev/") ? path + 5 : path)))
8c6db833
LP		 3316 return -ENOMEM;
3317
3318 *r = c;
3319 return 0;
3320}
3321
fc116c6a
LP		 3322int getttyname_harder(int fd, char **r) {
3323 int k;
3324 char *s;
3325
3326 if ((k = getttyname_malloc(fd, &s)) < 0)
3327 return k;
3328
3329 if (streq(s, "tty")) {
3330 free(s);
4d6d6518 3331 return get_ctty(0, NULL, r);
fc116c6a
LP		 3332 }
3333
3334 *r = s;
3335 return 0;
3336}
3337
4d6d6518 3338int get_ctty_devnr(pid_t pid, dev_t *d) {
fc116c6a 3339 int k;
4d6d6518 3340 char line[LINE_MAX], *p, *fn;
fc116c6a
LP		 3341 unsigned long ttynr;
3342 FILE *f;
3343
4d6d6518
LP		 3344 if (asprintf(&fn, "/proc/%lu/stat", (unsigned long) (pid <= 0 ? getpid() : pid)) < 0)
3345 return -ENOMEM;
3346
3347 f = fopen(fn, "re");
3348 free(fn);
3349 if (!f)
fc116c6a
LP		 3350 return -errno;
3351
4d6d6518 3352 if (!fgets(line, sizeof(line), f)) {
35d50f55 3353 k = feof(f) ? -EIO : -errno;
fc116c6a
LP		 3354 fclose(f);
3355 return k;
3356 }
3357
3358 fclose(f);
3359
4d6d6518
LP		 3360 p = strrchr(line, ')');
3361 if (!p)
fc116c6a
LP		 3362 return -EIO;
3363
3364 p++;
3365
3366 if (sscanf(p, " "
3367 "%*c " /* state */
3368 "%*d " /* ppid */
3369 "%*d " /* pgrp */
3370 "%*d " /* session */
3371 "%lu ", /* ttynr */
3372 &ttynr) != 1)
3373 return -EIO;
3374
3375 *d = (dev_t) ttynr;
3376 return 0;
3377}
3378
4d6d6518 3379int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
fc116c6a 3380 int k;
20c03b7b 3381 char fn[PATH_MAX], *s, *b, *p;
fc116c6a
LP		 3382 dev_t devnr;
3383
3384 assert(r);
3385
4d6d6518
LP		 3386 k = get_ctty_devnr(pid, &devnr);
3387 if (k < 0)
fc116c6a
LP		 3388 return k;
3389
3390 snprintf(fn, sizeof(fn), "/dev/char/%u:%u", major(devnr), minor(devnr));
3391 char_array_0(fn);
3392
3393 if ((k = readlink_malloc(fn, &s)) < 0) {
3394
3395 if (k != -ENOENT)
3396 return k;
3397
46824d0e
LP		 3398 /* This is an ugly hack */
3399 if (major(devnr) == 136) {
3400 if (asprintf(&b, "pts/%lu", (unsigned long) minor(devnr)) < 0)
3401 return -ENOMEM;
3402
3403 *r = b;
3404 if (_devnr)
3405 *_devnr = devnr;
3406
3407 return 0;
3408 }
3409
fc116c6a
LP		 3410 /* Probably something like the ptys which have no
3411 * symlink in /dev/char. Let's return something
3412 * vaguely useful. */
3413
3414 if (!(b = strdup(fn + 5)))
3415 return -ENOMEM;
3416
3417 *r = b;
46824d0e
LP		 3418 if (_devnr)
3419 *_devnr = devnr;
3420
fc116c6a
LP		 3421 return 0;
3422 }
3423
3424 if (startswith(s, "/dev/"))
3425 p = s + 5;
3426 else if (startswith(s, "../"))
3427 p = s + 3;
3428 else
3429 p = s;
3430
3431 b = strdup(p);
3432 free(s);
3433
3434 if (!b)
3435 return -ENOMEM;
3436
3437 *r = b;
46824d0e
LP		 3438 if (_devnr)
3439 *_devnr = devnr;
3440
fc116c6a
LP		 3441 return 0;
3442}
3443
ad293f5a 3444static int rm_rf_children(int fd, bool only_dirs, bool honour_sticky) {
8c6db833
LP		 3445 DIR *d;
3446 int ret = 0;
3447
3448 assert(fd >= 0);
3449
3450 /* This returns the first error we run into, but nevertheless
3451 * tries to go on */
3452
3453 if (!(d = fdopendir(fd))) {
3454 close_nointr_nofail(fd);
4c633005
LP		 3455
3456 return errno == ENOENT ? 0 : -errno;
8c6db833
LP		 3457 }
3458
3459 for (;;) {
3460 struct dirent buf, *de;
ad293f5a 3461 bool is_dir, keep_around = false;
8c6db833
LP		 3462 int r;
3463
3464 if ((r = readdir_r(d, &buf, &de)) != 0) {
3465 if (ret == 0)
3466 ret = -r;
3467 break;
3468 }
3469
3470 if (!de)
3471 break;
3472
3473 if (streq(de->d_name, ".") || streq(de->d_name, ".."))
3474 continue;
3475
3476 if (de->d_type == DT_UNKNOWN) {
3477 struct stat st;
3478
3479 if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
4c633005 3480 if (ret == 0 && errno != ENOENT)
8c6db833
LP		 3481 ret = -errno;
3482 continue;
3483 }
3484
ad293f5a 3485 if (honour_sticky)
8d53b453
LP		 3486 keep_around =
3487 (st.st_uid == 0 || st.st_uid == getuid()) &&
3488 (st.st_mode & S_ISVTX);
ad293f5a 3489
8c6db833 3490 is_dir = S_ISDIR(st.st_mode);
ad293f5a
LP		 3491
3492 } else {
3493 if (honour_sticky) {
3494 struct stat st;
3495
3496 if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
3497 if (ret == 0 && errno != ENOENT)
3498 ret = -errno;
3499 continue;
3500 }
3501
8d53b453
LP		 3502 keep_around =
3503 (st.st_uid == 0 || st.st_uid == getuid()) &&
3504 (st.st_mode & S_ISVTX);
ad293f5a
LP		 3505 }
3506
8c6db833 3507 is_dir = de->d_type == DT_DIR;
ad293f5a 3508 }
8c6db833
LP		 3509
3510 if (is_dir) {
3511 int subdir_fd;
3512
3513 if ((subdir_fd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)) < 0) {
4c633005 3514 if (ret == 0 && errno != ENOENT)
8c6db833
LP		 3515 ret = -errno;
3516 continue;
3517 }
3518
ad293f5a 3519 if ((r = rm_rf_children(subdir_fd, only_dirs, honour_sticky)) < 0) {
8c6db833
LP		 3520 if (ret == 0)
3521 ret = r;
3522 }
3523
ad293f5a
LP		 3524 if (!keep_around)
3525 if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
3526 if (ret == 0 && errno != ENOENT)
3527 ret = -errno;
3528 }
3529
3530 } else if (!only_dirs && !keep_around) {
8c6db833
LP		 3531
3532 if (unlinkat(fd, de->d_name, 0) < 0) {
4c633005 3533 if (ret == 0 && errno != ENOENT)
8c6db833
LP		 3534 ret = -errno;
3535 }
3536 }
3537 }
3538
3539 closedir(d);
3540
3541 return ret;
3542}
3543
ad293f5a 3544int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
8c6db833
LP		 3545 int fd;
3546 int r;
3547
3548 assert(path);
3549
3550 if ((fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)) < 0) {
3551
3552 if (errno != ENOTDIR)
3553 return -errno;
3554
3555 if (delete_root && !only_dirs)
3556 if (unlink(path) < 0)
3557 return -errno;
3558
3559 return 0;
3560 }
3561
ad293f5a
LP		 3562 r = rm_rf_children(fd, only_dirs, honour_sticky);
3563
3564 if (delete_root) {
3565
8d53b453 3566 if (honour_sticky && file_is_priv_sticky(path) > 0)
ad293f5a 3567 return r;
8c6db833 3568
e27796a0 3569 if (rmdir(path) < 0 && errno != ENOENT) {
8c6db833
LP		 3570 if (r == 0)
3571 r = -errno;
3572 }
ad293f5a 3573 }
8c6db833
LP		 3574
3575 return r;
3576}
3577
3578int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
3579 assert(path);
3580
3581 /* Under the assumption that we are running privileged we
3582 * first change the access mode and only then hand out
3583 * ownership to avoid a window where access is too open. */
3584
8d53b453
LP		 3585 if (mode != (mode_t) -1)
3586 if (chmod(path, mode) < 0)
3587 return -errno;
8c6db833 3588
8d53b453
LP		 3589 if (uid != (uid_t) -1 || gid != (gid_t) -1)
3590 if (chown(path, uid, gid) < 0)
3591 return -errno;
8c6db833
LP		 3592
3593 return 0;
ef2f1067
LP		 3594}
3595
f4b47811
LP		 3596int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid) {
3597 assert(fd >= 0);
3598
3599 /* Under the assumption that we are running privileged we
3600 * first change the access mode and only then hand out
3601 * ownership to avoid a window where access is too open. */
3602
3603 if (fchmod(fd, mode) < 0)
3604 return -errno;
3605
3606 if (fchown(fd, uid, gid) < 0)
3607 return -errno;
3608
3609 return 0;
3610}
3611
82c121a4
LP		 3612cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
3613 cpu_set_t *r;
3614 unsigned n = 1024;
3615
3616 /* Allocates the cpuset in the right size */
3617
3618 for (;;) {
3619 if (!(r = CPU_ALLOC(n)))
3620 return NULL;
3621
3622 if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), r) >= 0) {
3623 CPU_ZERO_S(CPU_ALLOC_SIZE(n), r);
3624
3625 if (ncpus)
3626 *ncpus = n;
3627
3628 return r;
3629 }
3630
3631 CPU_FREE(r);
3632
3633 if (errno != EINVAL)
3634 return NULL;
3635
3636 n *= 2;
3637 }
3638}
3639
67e5cc4f 3640void status_vprintf(const char *status, bool ellipse, const char *format, va_list ap) {
81beb750
LP		 3641 char *s = NULL, *spaces = NULL, *e;
3642 int fd = -1, c;
3643 size_t emax, sl, left;
3644 struct iovec iovec[5];
3645 int n = 0;
9e58ff9c
LP		 3646
3647 assert(format);
3648
3649 /* This independent of logging, as status messages are
3650 * optional and go exclusively to the console. */
3651
3652 if (vasprintf(&s, format, ap) < 0)
3653 goto finish;
3654
67e5cc4f 3655 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
81beb750 3656 if (fd < 0)
9e58ff9c
LP		 3657 goto finish;
3658
67e5cc4f
LP		 3659 if (ellipse) {
3660 c = fd_columns(fd);
3661 if (c <= 0)
3662 c = 80;
81beb750 3663
67e5cc4f
LP		 3664 if (status) {
3665 sl = 2 + 6 + 1; /* " [" status "]" */
3666 emax = (size_t) c > sl ? c - sl - 1 : 0;
3667 } else
3668 emax = c - 1;
81beb750 3669
67e5cc4f
LP		 3670 e = ellipsize(s, emax, 75);
3671 if (e) {
3672 free(s);
3673 s = e;
3674 }
81beb750
LP		 3675 }
3676
3677 zero(iovec);
3678 IOVEC_SET_STRING(iovec[n++], s);
3679
67e5cc4f
LP		 3680 if (ellipse) {
3681 sl = strlen(s);
3682 left = emax > sl ? emax - sl : 0;
3683 if (left > 0) {
3684 spaces = malloc(left);
3685 if (spaces) {
3686 memset(spaces, ' ', left);
3687 iovec[n].iov_base = spaces;
3688 iovec[n].iov_len = left;
3689 n++;
3690 }
81beb750
LP		 3691 }
3692 }
3693
3694 if (status) {
3695 IOVEC_SET_STRING(iovec[n++], " [");
3696 IOVEC_SET_STRING(iovec[n++], status);
3697 IOVEC_SET_STRING(iovec[n++], "]\n");
3698 } else
3699 IOVEC_SET_STRING(iovec[n++], "\n");
3700
3701 writev(fd, iovec, n);
9e58ff9c
LP		 3702
3703finish:
3704 free(s);
81beb750 3705 free(spaces);
9e58ff9c
LP		 3706
3707 if (fd >= 0)
3708 close_nointr_nofail(fd);
3709}
3710
67e5cc4f 3711void status_printf(const char *status, bool ellipse, const char *format, ...) {
c846ff47
LP		 3712 va_list ap;
3713
3714 assert(format);
3715
3716 va_start(ap, format);
67e5cc4f 3717 status_vprintf(status, ellipse, format, ap);
c846ff47
LP		 3718 va_end(ap);
3719}
3720
3721void status_welcome(void) {
10aa7034
LP		 3722 char *pretty_name = NULL, *ansi_color = NULL;
3723 const char *const_pretty = NULL, *const_color = NULL;
3724 int r;
c846ff47 3725
10aa7034
LP		 3726 if ((r = parse_env_file("/etc/os-release", NEWLINE,
3727 "PRETTY_NAME", &pretty_name,
3728 "ANSI_COLOR", &ansi_color,
3729 NULL)) < 0) {
c846ff47 3730
10aa7034
LP		 3731 if (r != -ENOENT)
3732 log_warning("Failed to read /etc/os-release: %s", strerror(-r));
3733 }
c846ff47 3734
10aa7034
LP		 3735#if defined(TARGET_FEDORA)
3736 if (!pretty_name) {
3737 if ((r = read_one_line_file("/etc/system-release", &pretty_name)) < 0) {
c846ff47 3738
10aa7034
LP		 3739 if (r != -ENOENT)
3740 log_warning("Failed to read /etc/system-release: %s", strerror(-r));
6f9a471a 3741 }
10aa7034 3742 }
c846ff47 3743
10aa7034 3744 if (!ansi_color && pretty_name) {
c846ff47 3745
10aa7034
LP		 3746 /* This tries to mimic the color magic the old Red Hat sysinit
3747 * script did. */
3748
3749 if (startswith(pretty_name, "Red Hat"))
3750 const_color = "0;31"; /* Red for RHEL */
3751 else if (startswith(pretty_name, "Fedora"))
3752 const_color = "0;34"; /* Blue for Fedora */
3753 }
c846ff47
LP		 3754
3755#elif defined(TARGET_SUSE)
c846ff47 3756
10aa7034
LP		 3757 if (!pretty_name) {
3758 if ((r = read_one_line_file("/etc/SuSE-release", &pretty_name)) < 0) {
c846ff47 3759
10aa7034
LP		 3760 if (r != -ENOENT)
3761 log_warning("Failed to read /etc/SuSE-release: %s", strerror(-r));
6f9a471a 3762 }
10aa7034 3763 }
c846ff47 3764
10aa7034
LP		 3765 if (!ansi_color)
3766 const_color = "0;32"; /* Green for openSUSE */
5a6225fd 3767
0d37b36b 3768#elif defined(TARGET_GENTOO)
0d37b36b 3769
10aa7034
LP		 3770 if (!pretty_name) {
3771 if ((r = read_one_line_file("/etc/gentoo-release", &pretty_name)) < 0) {
0d37b36b 3772
10aa7034
LP		 3773 if (r != -ENOENT)
3774 log_warning("Failed to read /etc/gentoo-release: %s", strerror(-r));
6f9a471a 3775 }
10aa7034 3776 }
0d37b36b 3777
10aa7034
LP		 3778 if (!ansi_color)
3779 const_color = "1;34"; /* Light Blue for Gentoo */
5a6225fd 3780
a338bab5
AS		 3781#elif defined(TARGET_ALTLINUX)
3782
3783 if (!pretty_name) {
3784 if ((r = read_one_line_file("/etc/altlinux-release", &pretty_name)) < 0) {
3785
3786 if (r != -ENOENT)
3787 log_warning("Failed to read /etc/altlinux-release: %s", strerror(-r));
6f9a471a 3788 }
a338bab5
AS		 3789 }
3790
3791 if (!ansi_color)
3792 const_color = "0;36"; /* Cyan for ALTLinux */
3793
3794
5a6225fd 3795#elif defined(TARGET_DEBIAN)
5a6225fd 3796
10aa7034 3797 if (!pretty_name) {
22927a36 3798 char *version;
c8bffa43 3799
22927a36 3800 if ((r = read_one_line_file("/etc/debian_version", &version)) < 0) {
5a6225fd 3801
10aa7034
LP		 3802 if (r != -ENOENT)
3803 log_warning("Failed to read /etc/debian_version: %s", strerror(-r));
22927a36 3804 } else {
22927a36
MB		 3805 pretty_name = strappend("Debian ", version);
3806 free(version);
c8bffa43
LP		 3807
3808 if (!pretty_name)
3809 log_warning("Failed to allocate Debian version string.");
22927a36 3810 }
10aa7034 3811 }
5a6225fd 3812
10aa7034
LP		 3813 if (!ansi_color)
3814 const_color = "1;31"; /* Light Red for Debian */
5a6225fd 3815
274914f9 3816#elif defined(TARGET_UBUNTU)
10aa7034
LP		 3817
3818 if ((r = parse_env_file("/etc/lsb-release", NEWLINE,
3819 "DISTRIB_DESCRIPTION", &pretty_name,
3820 NULL)) < 0) {
3821
3822 if (r != -ENOENT)
3823 log_warning("Failed to read /etc/lsb-release: %s", strerror(-r));
3824 }
3825
3826 if (!ansi_color)
3827 const_color = "0;33"; /* Orange/Brown for Ubuntu */
3828
1de4d79b
AB		 3829#elif defined(TARGET_MANDRIVA)
3830
3831 if (!pretty_name) {
3832 char *s, *p;
3833
3834 if ((r = read_one_line_file("/etc/mandriva-release", &s) < 0)) {
3835 if (r != -ENOENT)
3836 log_warning("Failed to read /etc/mandriva-release: %s", strerror(-r));
3837 } else {
3838 p = strstr(s, " release ");
3839 if (p) {
3840 *p = '\0';
3841 p += 9;
3842 p[strcspn(p, " ")] = '\0';
3843
3844 /* This corresponds to standard rc.sysinit */
3845 if (asprintf(&pretty_name, "%s\x1B[0;39m %s", s, p) > 0)
3846 const_color = "1;36";
3847 else
3848 log_warning("Failed to allocate Mandriva version string.");
3849 } else
3850 log_warning("Failed to parse /etc/mandriva-release");
3851 free(s);
3852 }
3853 }
54e4fdef 3854#elif defined(TARGET_MEEGO)
1de4d79b 3855
54e4fdef
CF		 3856 if (!pretty_name) {
3857 if ((r = read_one_line_file("/etc/meego-release", &pretty_name)) < 0) {
3858
3859 if (r != -ENOENT)
3860 log_warning("Failed to read /etc/meego-release: %s", strerror(-r));
3861 }
3862 }
3863
3864 if (!ansi_color)
3865 const_color = "1;35"; /* Bright Magenta for MeeGo */
c846ff47 3866#endif
10aa7034
LP		 3867
3868 if (!pretty_name && !const_pretty)
3869 const_pretty = "Linux";
3870
3871 if (!ansi_color && !const_color)
3872 const_color = "1";
3873
81beb750 3874 status_printf(NULL,
67e5cc4f 3875 false,
81beb750 3876 "\nWelcome to \x1B[%sm%s\x1B[0m!\n",
10aa7034
LP		 3877 const_color ? const_color : ansi_color,
3878 const_pretty ? const_pretty : pretty_name);
86a3475b
LP		 3879
3880 free(ansi_color);
3881 free(pretty_name);
c846ff47
LP		 3882}
3883
fab56fc5
LP		 3884char *replace_env(const char *format, char **env) {
3885 enum {
3886 WORD,
c24eb49e 3887 CURLY,
fab56fc5
LP		 3888 VARIABLE
3889 } state = WORD;
3890
3891 const char *e, *word = format;
3892 char *r = NULL, *k;
3893
3894 assert(format);
3895
3896 for (e = format; *e; e ++) {
3897
3898 switch (state) {
3899
3900 case WORD:
3901 if (*e == '$')
c24eb49e 3902 state = CURLY;
fab56fc5
LP		 3903 break;
3904
c24eb49e
LP		 3905 case CURLY:
3906 if (*e == '{') {
fab56fc5
LP		 3907 if (!(k = strnappend(r, word, e-word-1)))
3908 goto fail;
3909
3910 free(r);
3911 r = k;
3912
3913 word = e-1;
3914 state = VARIABLE;
3915
3916 } else if (*e == '$') {
3917 if (!(k = strnappend(r, word, e-word)))
3918 goto fail;
3919
3920 free(r);
3921 r = k;
3922
3923 word = e+1;
3924 state = WORD;
3925 } else
3926 state = WORD;
3927 break;
3928
3929 case VARIABLE:
c24eb49e 3930 if (*e == '}') {
b95cf362 3931 const char *t;
fab56fc5 3932
b95cf362
LP		 3933 if (!(t = strv_env_get_with_length(env, word+2, e-word-2)))
3934 t = "";
fab56fc5 3935
b95cf362
LP		 3936 if (!(k = strappend(r, t)))
3937 goto fail;
fab56fc5 3938
b95cf362
LP		 3939 free(r);
3940 r = k;
fab56fc5 3941
b95cf362 3942 word = e+1;
fab56fc5
LP		 3943 state = WORD;
3944 }
3945 break;
3946 }
3947 }
3948
3949 if (!(k = strnappend(r, word, e-word)))
3950 goto fail;
3951
3952 free(r);
3953 return k;
3954
3955fail:
3956 free(r);
3957 return NULL;
3958}
3959
3960char **replace_env_argv(char **argv, char **env) {
3961 char **r, **i;
c24eb49e
LP		 3962 unsigned k = 0, l = 0;
3963
3964 l = strv_length(argv);
fab56fc5 3965
c24eb49e 3966 if (!(r = new(char*, l+1)))
fab56fc5
LP		 3967 return NULL;
3968
3969 STRV_FOREACH(i, argv) {
c24eb49e
LP		 3970
3971 /* If $FOO appears as single word, replace it by the split up variable */
b95cf362
LP		 3972 if ((*i)[0] == '$' && (*i)[1] != '{') {
3973 char *e;
3974 char **w, **m;
3975 unsigned q;
c24eb49e 3976
b95cf362 3977 if ((e = strv_env_get(env, *i+1))) {
c24eb49e
LP		 3978
3979 if (!(m = strv_split_quoted(e))) {
3980 r[k] = NULL;
3981 strv_free(r);
3982 return NULL;
3983 }
b95cf362
LP		 3984 } else
3985 m = NULL;
c24eb49e 3986
b95cf362
LP		 3987 q = strv_length(m);
3988 l = l + q - 1;
c24eb49e 3989
b95cf362
LP		 3990 if (!(w = realloc(r, sizeof(char*) * (l+1)))) {
3991 r[k] = NULL;
3992 strv_free(r);
3993 strv_free(m);
3994 return NULL;
3995 }
c24eb49e 3996
b95cf362
LP		 3997 r = w;
3998 if (m) {
c24eb49e
LP		 3999 memcpy(r + k, m, q * sizeof(char*));
4000 free(m);
c24eb49e 4001 }
b95cf362
LP		 4002
4003 k += q;
4004 continue;
c24eb49e
LP		 4005 }
4006
4007 /* If ${FOO} appears as part of a word, replace it by the variable as-is */
fab56fc5
LP		 4008 if (!(r[k++] = replace_env(*i, env))) {
4009 strv_free(r);
4010 return NULL;
4011 }
4012 }
4013
4014 r[k] = NULL;
4015 return r;
4016}
4017
81beb750
LP		 4018int fd_columns(int fd) {
4019 struct winsize ws;
4020 zero(ws);
4021
4022 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
4023 return -errno;
4024
4025 if (ws.ws_col <= 0)
4026 return -EIO;
4027
4028 return ws.ws_col;
4029}
4030
72f59706 4031unsigned columns(void) {
fa776d8e
LP		 4032 static __thread int parsed_columns = 0;
4033 const char *e;
4034
3bfc7184 4035 if (_likely_(parsed_columns > 0))
fa776d8e
LP		 4036 return parsed_columns;
4037
81beb750
LP		 4038 e = getenv("COLUMNS");
4039 if (e)
fa776d8e
LP		 4040 parsed_columns = atoi(e);
4041
81beb750
LP		 4042 if (parsed_columns <= 0)
4043 parsed_columns = fd_columns(STDOUT_FILENO);
fa776d8e
LP		 4044
4045 if (parsed_columns <= 0)
4046 parsed_columns = 80;
4047
4048 return parsed_columns;
4049}
4050
b4f10a5e
LP		 4051int running_in_chroot(void) {
4052 struct stat a, b;
4053
4054 zero(a);
4055 zero(b);
4056
4057 /* Only works as root */
4058
4059 if (stat("/proc/1/root", &a) < 0)
4060 return -errno;
4061
4062 if (stat("/", &b) < 0)
4063 return -errno;
4064
4065 return
4066 a.st_dev != b.st_dev ||
4067 a.st_ino != b.st_ino;
4068}
4069
72f59706
LP		 4070char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
4071 size_t x;
8fe914ec
LP		 4072 char *r;
4073
4074 assert(s);
4075 assert(percent <= 100);
72f59706 4076 assert(new_length >= 3);
8fe914ec 4077
72f59706
LP		 4078 if (old_length <= 3 || old_length <= new_length)
4079 return strndup(s, old_length);
8fe914ec 4080
72f59706
LP		 4081 r = new0(char, new_length+1);
4082 if (!r)
8fe914ec
LP		 4083 return r;
4084
72f59706 4085 x = (new_length * percent) / 100;
8fe914ec 4086
72f59706
LP		 4087 if (x > new_length - 3)
4088 x = new_length - 3;
8fe914ec
LP		 4089
4090 memcpy(r, s, x);
4091 r[x] = '.';
4092 r[x+1] = '.';
4093 r[x+2] = '.';
4094 memcpy(r + x + 3,
72f59706
LP		 4095 s + old_length - (new_length - x - 3),
4096 new_length - x - 3);
8fe914ec
LP		 4097
4098 return r;
4099}
4100
72f59706
LP		 4101char *ellipsize(const char *s, size_t length, unsigned percent) {
4102 return ellipsize_mem(s, strlen(s), length, percent);
4103}
4104
f6144808
LP		 4105int touch(const char *path) {
4106 int fd;
4107
4108 assert(path);
4109
14f3c825 4110 if ((fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644)) < 0)
f6144808
LP		 4111 return -errno;
4112
4113 close_nointr_nofail(fd);
4114 return 0;
4115}
afea26ad 4116
97c4a07d 4117char *unquote(const char *s, const char* quotes) {
11ce3427
LP		 4118 size_t l;
4119 assert(s);
4120
4121 if ((l = strlen(s)) < 2)
4122 return strdup(s);
4123
97c4a07d 4124 if (strchr(quotes, s[0]) && s[l-1] == s[0])
11ce3427
LP		 4125 return strndup(s+1, l-2);
4126
4127 return strdup(s);
4128}
4129
5f7c426e
LP		 4130char *normalize_env_assignment(const char *s) {
4131 char *name, *value, *p, *r;
4132
4133 p = strchr(s, '=');
4134
4135 if (!p) {
4136 if (!(r = strdup(s)))
4137 return NULL;
4138
4139 return strstrip(r);
4140 }
4141
4142 if (!(name = strndup(s, p - s)))
4143 return NULL;
4144
4145 if (!(p = strdup(p+1))) {
4146 free(name);
4147 return NULL;
4148 }
4149
4150 value = unquote(strstrip(p), QUOTES);
4151 free(p);
4152
4153 if (!value) {
5f7c426e
LP		 4154 free(name);
4155 return NULL;
4156 }
4157
4158 if (asprintf(&r, "%s=%s", name, value) < 0)
4159 r = NULL;
4160
4161 free(value);
4162 free(name);
4163
4164 return r;
4165}
4166
8e12a6ae 4167int wait_for_terminate(pid_t pid, siginfo_t *status) {
1968a360
LP		 4168 siginfo_t dummy;
4169
2e78aa99 4170 assert(pid >= 1);
1968a360
LP		 4171
4172 if (!status)
4173 status = &dummy;
2e78aa99
LP		 4174
4175 for (;;) {
8e12a6ae
LP		 4176 zero(*status);
4177
4178 if (waitid(P_PID, pid, status, WEXITED) < 0) {
2e78aa99
LP		 4179
4180 if (errno == EINTR)
4181 continue;
4182
4183 return -errno;
4184 }
4185
4186 return 0;
4187 }
4188}
4189
97c4a07d
LP		 4190int wait_for_terminate_and_warn(const char *name, pid_t pid) {
4191 int r;
4192 siginfo_t status;
4193
4194 assert(name);
4195 assert(pid > 1);
4196
4197 if ((r = wait_for_terminate(pid, &status)) < 0) {
4198 log_warning("Failed to wait for %s: %s", name, strerror(-r));
4199 return r;
4200 }
4201
4202 if (status.si_code == CLD_EXITED) {
4203 if (status.si_status != 0) {
4204 log_warning("%s failed with error code %i.", name, status.si_status);
0a27cf3f 4205 return status.si_status;
97c4a07d
LP		 4206 }
4207
4208 log_debug("%s succeeded.", name);
4209 return 0;
4210
4211 } else if (status.si_code == CLD_KILLED ||
4212 status.si_code == CLD_DUMPED) {
4213
4214 log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
4215 return -EPROTO;
4216 }
4217
4218 log_warning("%s failed due to unknown reason.", name);
4219 return -EPROTO;
4220
4221}
4222
3c14d26c 4223void freeze(void) {
720ce21d
LP		 4224
4225 /* Make sure nobody waits for us on a socket anymore */
4226 close_all_fds(NULL, 0);
4227
c29597a1
LP		 4228 sync();
4229
3c14d26c
LP		 4230 for (;;)
4231 pause();
4232}
4233
00dc5d76
LP		 4234bool null_or_empty(struct stat *st) {
4235 assert(st);
4236
4237 if (S_ISREG(st->st_mode) && st->st_size <= 0)
4238 return true;
4239
c8f26f42 4240 if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode))
00dc5d76
LP		 4241 return true;
4242
4243 return false;
4244}
4245
83096483
LP		 4246int null_or_empty_path(const char *fn) {
4247 struct stat st;
4248
4249 assert(fn);
4250
4251 if (stat(fn, &st) < 0)
4252 return -errno;
4253
4254 return null_or_empty(&st);
4255}
4256
a247755d 4257DIR *xopendirat(int fd, const char *name, int flags) {
c4731d11
LP		 4258 int nfd;
4259 DIR *d;
4260
4261 if ((nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags)) < 0)
4262 return NULL;
4263
4264 if (!(d = fdopendir(nfd))) {
4265 close_nointr_nofail(nfd);
4266 return NULL;
4267 }
4268
4269 return d;
3b63d2d3
LP		 4270}
4271
8a0867d6
LP		 4272int signal_from_string_try_harder(const char *s) {
4273 int signo;
4274 assert(s);
4275
4276 if ((signo = signal_from_string(s)) <= 0)
4277 if (startswith(s, "SIG"))
4278 return signal_from_string(s+3);
4279
4280 return signo;
4281}
4282
10717a1a
LP		 4283void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) {
4284
4285 assert(f);
4286 assert(name);
4287 assert(t);
4288
4289 if (!dual_timestamp_is_set(t))
4290 return;
4291
4292 fprintf(f, "%s=%llu %llu\n",
4293 name,
4294 (unsigned long long) t->realtime,
4295 (unsigned long long) t->monotonic);
4296}
4297
799fd0fd 4298void dual_timestamp_deserialize(const char *value, dual_timestamp *t) {
10717a1a
LP		 4299 unsigned long long a, b;
4300
10717a1a
LP		 4301 assert(value);
4302 assert(t);
4303
4304 if (sscanf(value, "%lli %llu", &a, &b) != 2)
4305 log_debug("Failed to parse finish timestamp value %s", value);
4306 else {
4307 t->realtime = a;
4308 t->monotonic = b;
4309 }
4310}
4311
e23a0ce8
LP		 4312char *fstab_node_to_udev_node(const char *p) {
4313 char *dn, *t, *u;
4314 int r;
4315
4316 /* FIXME: to follow udev's logic 100% we need to leave valid
4317 * UTF8 chars unescaped */
4318
4319 if (startswith(p, "LABEL=")) {
4320
4321 if (!(u = unquote(p+6, "\"\'")))
4322 return NULL;
4323
4324 t = xescape(u, "/ ");
4325 free(u);
4326
4327 if (!t)
4328 return NULL;
4329
4330 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
4331 free(t);
4332
4333 if (r < 0)
4334 return NULL;
4335
4336 return dn;
4337 }
4338
4339 if (startswith(p, "UUID=")) {
4340
4341 if (!(u = unquote(p+5, "\"\'")))
4342 return NULL;
4343
4344 t = xescape(u, "/ ");
4345 free(u);
4346
4347 if (!t)
4348 return NULL;
4349
0058d7b9 4350 r = asprintf(&dn, "/dev/disk/by-uuid/%s", t);
e23a0ce8
LP		 4351 free(t);
4352
4353 if (r < 0)
4354 return NULL;
4355
4356 return dn;
4357 }
4358
4359 return strdup(p);
4360}
4361
e9ddabc2
LP		 4362void filter_environ(const char *prefix) {
4363 int i, j;
4364 assert(prefix);
4365
4366 if (!environ)
4367 return;
4368
4369 for (i = 0, j = 0; environ[i]; i++) {
4370
4371 if (startswith(environ[i], prefix))
4372 continue;
4373
4374 environ[j++] = environ[i];
4375 }
4376
4377 environ[j] = NULL;
4378}
4379
f212ac12
LP		 4380bool tty_is_vc(const char *tty) {
4381 assert(tty);
4382
4383 if (startswith(tty, "/dev/"))
4384 tty += 5;
4385
98a28fef
LP		 4386 return vtnr_from_tty(tty) >= 0;
4387}
4388
4389int vtnr_from_tty(const char *tty) {
4390 int i, r;
4391
4392 assert(tty);
4393
4394 if (startswith(tty, "/dev/"))
4395 tty += 5;
4396
4397 if (!startswith(tty, "tty") )
4398 return -EINVAL;
4399
4400 if (tty[3] < '0' || tty[3] > '9')
4401 return -EINVAL;
4402
4403 r = safe_atoi(tty+3, &i);
4404 if (r < 0)
4405 return r;
4406
4407 if (i < 0 || i > 63)
4408 return -EINVAL;
4409
4410 return i;
f212ac12
LP		 4411}
4412
3043935f 4413bool tty_is_vc_resolve(const char *tty) {
3030ccd7 4414 char *active = NULL;
3043935f 4415 bool b;
3030ccd7 4416
e3aa71c3
LP		 4417 assert(tty);
4418
4419 if (startswith(tty, "/dev/"))
4420 tty += 5;
4421
3043935f 4422 /* Resolve where /dev/console is pointing to */
3030ccd7
LP		 4423 if (streq(tty, "console"))
4424 if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
079a09fb
LP		 4425 /* If multiple log outputs are configured the
4426 * last one is what /dev/console points to */
3043935f
LP		 4427 tty = strrchr(active, ' ');
4428 if (tty)
079a09fb
LP		 4429 tty++;
4430 else
4431 tty = active;
3030ccd7
LP		 4432 }
4433
3043935f 4434 b = tty_is_vc(tty);
3030ccd7 4435 free(active);
e3aa71c3 4436
3043935f
LP		 4437 return b;
4438}
4439
4440const char *default_term_for_tty(const char *tty) {
4441 assert(tty);
4442
4443 return tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt100";
e3aa71c3
LP		 4444}
4445
87d2c1ff 4446bool dirent_is_file(const struct dirent *de) {
fb19a739
LP		 4447 assert(de);
4448
4449 if (ignore_file(de->d_name))
4450 return false;
4451
4452 if (de->d_type != DT_REG &&
4453 de->d_type != DT_LNK &&
4454 de->d_type != DT_UNKNOWN)
4455 return false;
4456
4457 return true;
4458}
4459
87d2c1ff
LP		 4460bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) {
4461 assert(de);
4462
4463 if (!dirent_is_file(de))
4464 return false;
4465
4466 return endswith(de->d_name, suffix);
4467}
4468
83cc030f
LP		 4469void execute_directory(const char *directory, DIR *d, char *argv[]) {
4470 DIR *_d = NULL;
4471 struct dirent *de;
4472 Hashmap *pids = NULL;
4473
4474 assert(directory);
4475
4476 /* Executes all binaries in a directory in parallel and waits
4477 * until all they all finished. */
4478
4479 if (!d) {
4480 if (!(_d = opendir(directory))) {
4481
4482 if (errno == ENOENT)
4483 return;
4484
4485 log_error("Failed to enumerate directory %s: %m", directory);
4486 return;
4487 }
4488
4489 d = _d;
4490 }
4491
4492 if (!(pids = hashmap_new(trivial_hash_func, trivial_compare_func))) {
4493 log_error("Failed to allocate set.");
4494 goto finish;
4495 }
4496
4497 while ((de = readdir(d))) {
4498 char *path;
4499 pid_t pid;
4500 int k;
4501
fb19a739 4502 if (!dirent_is_file(de))
83cc030f
LP		 4503 continue;
4504
4505 if (asprintf(&path, "%s/%s", directory, de->d_name) < 0) {
4506 log_error("Out of memory");
4507 continue;
4508 }
4509
4510 if ((pid = fork()) < 0) {
4511 log_error("Failed to fork: %m");
4512 free(path);
4513 continue;
4514 }
4515
4516 if (pid == 0) {
4517 char *_argv[2];
4518 /* Child */
4519
4520 if (!argv) {
4521 _argv[0] = path;
4522 _argv[1] = NULL;
4523 argv = _argv;
4524 } else
4525 if (!argv[0])
4526 argv[0] = path;
4527
4528 execv(path, argv);
4529
4530 log_error("Failed to execute %s: %m", path);
4531 _exit(EXIT_FAILURE);
4532 }
4533
4534 log_debug("Spawned %s as %lu", path, (unsigned long) pid);
4535
4536 if ((k = hashmap_put(pids, UINT_TO_PTR(pid), path)) < 0) {
4537 log_error("Failed to add PID to set: %s", strerror(-k));
4538 free(path);
4539 }
4540 }
4541
4542 while (!hashmap_isempty(pids)) {
4543 siginfo_t si;
4544 char *path;
4545
4546 zero(si);
4547 if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
4548
4549 if (errno == EINTR)
4550 continue;
4551
4552 log_error("waitid() failed: %m");
4553 goto finish;
4554 }
4555
4556 if ((path = hashmap_remove(pids, UINT_TO_PTR(si.si_pid)))) {
4557 if (!is_clean_exit(si.si_code, si.si_status)) {
4558 if (si.si_code == CLD_EXITED)
4559 log_error("%s exited with exit status %i.", path, si.si_status);
4560 else
4561 log_error("%s terminated by signal %s.", path, signal_to_string(si.si_status));
4562 } else
4563 log_debug("%s exited successfully.", path);
4564
4565 free(path);
4566 }
4567 }
4568
4569finish:
4570 if (_d)
4571 closedir(_d);
4572
4573 if (pids)
4574 hashmap_free_free(pids);
4575}
4576
430c18ed
LP		 4577int kill_and_sigcont(pid_t pid, int sig) {
4578 int r;
4579
4580 r = kill(pid, sig) < 0 ? -errno : 0;
4581
4582 if (r >= 0)
4583 kill(pid, SIGCONT);
4584
4585 return r;
4586}
4587
05feefe0
LP		 4588bool nulstr_contains(const char*nulstr, const char *needle) {
4589 const char *i;
4590
4591 if (!nulstr)
4592 return false;
4593
4594 NULSTR_FOREACH(i, nulstr)
4595 if (streq(i, needle))
4596 return true;
4597
4598 return false;
4599}
4600
6faa1114 4601bool plymouth_running(void) {
9408a2d2 4602 return access("/run/plymouth/pid", F_OK) >= 0;
6faa1114
LP		 4603}
4604
7c3b203c
LP		 4605void parse_syslog_priority(char **p, int *priority) {
4606 int a = 0, b = 0, c = 0;
4607 int k;
4608
4609 assert(p);
4610 assert(*p);
4611 assert(priority);
4612
4613 if ((*p)[0] != '<')
4614 return;
4615
4616 if (!strchr(*p, '>'))
4617 return;
4618
4619 if ((*p)[2] == '>') {
4620 c = undecchar((*p)[1]);
4621 k = 3;
4622 } else if ((*p)[3] == '>') {
4623 b = undecchar((*p)[1]);
4624 c = undecchar((*p)[2]);
4625 k = 4;
4626 } else if ((*p)[4] == '>') {
4627 a = undecchar((*p)[1]);
4628 b = undecchar((*p)[2]);
4629 c = undecchar((*p)[3]);
4630 k = 5;
4631 } else
4632 return;
4633
4634 if (a < 0 || b < 0 || c < 0)
4635 return;
4636
4637 *priority = a*100+b*10+c;
4638 *p += k;
4639}
4640
87d2c1ff
LP		 4641void skip_syslog_pid(char **buf) {
4642 char *p;
4643
4644 assert(buf);
4645 assert(*buf);
4646
4647 p = *buf;
4648
4649 if (*p != '[')
4650 return;
4651
4652 p++;
4653 p += strspn(p, "0123456789");
4654
4655 if (*p != ']')
4656 return;
4657
4658 p++;
4659
4660 *buf = p;
4661}
4662
4663void skip_syslog_date(char **buf) {
4664 enum {
4665 LETTER,
4666 SPACE,
4667 NUMBER,
4668 SPACE_OR_NUMBER,
4669 COLON
4670 } sequence[] = {
4671 LETTER, LETTER, LETTER,
4672 SPACE,
4673 SPACE_OR_NUMBER, NUMBER,
4674 SPACE,
4675 SPACE_OR_NUMBER, NUMBER,
4676 COLON,
4677 SPACE_OR_NUMBER, NUMBER,
4678 COLON,
4679 SPACE_OR_NUMBER, NUMBER,
4680 SPACE
4681 };
4682
4683 char *p;
4684 unsigned i;
4685
4686 assert(buf);
4687 assert(*buf);
4688
4689 p = *buf;
4690
4691 for (i = 0; i < ELEMENTSOF(sequence); i++, p++) {
4692
4693 if (!*p)
4694 return;
4695
4696 switch (sequence[i]) {
4697
4698 case SPACE:
4699 if (*p != ' ')
4700 return;
4701 break;
4702
4703 case SPACE_OR_NUMBER:
4704 if (*p == ' ')
4705 break;
4706
4707 /* fall through */
4708
4709 case NUMBER:
4710 if (*p < '0' || *p > '9')
4711 return;
4712
4713 break;
4714
4715 case LETTER:
4716 if (!(*p >= 'A' && *p <= 'Z') &&
4717 !(*p >= 'a' && *p <= 'z'))
4718 return;
4719
4720 break;
4721
4722 case COLON:
4723 if (*p != ':')
4724 return;
4725 break;
4726
4727 }
4728 }
4729
4730 *buf = p;
4731}
4732
ac123445
LP		 4733int have_effective_cap(int value) {
4734 cap_t cap;
4735 cap_flag_value_t fv;
4736 int r;
4737
4738 if (!(cap = cap_get_proc()))
4739 return -errno;
4740
4741 if (cap_get_flag(cap, value, CAP_EFFECTIVE, &fv) < 0)
4742 r = -errno;
4743 else
4744 r = fv == CAP_SET;
4745
4746 cap_free(cap);
4747 return r;
4748}
4749
9beb3f4d
LP		 4750char* strshorten(char *s, size_t l) {
4751 assert(s);
4752
4753 if (l < strlen(s))
4754 s[l] = 0;
4755
4756 return s;
4757}
4758
4759static bool hostname_valid_char(char c) {
4760 return
4761 (c >= 'a' && c <= 'z') ||
4762 (c >= 'A' && c <= 'Z') ||
4763 (c >= '0' && c <= '9') ||
4764 c == '-' ||
4765 c == '_' ||
4766 c == '.';
4767}
4768
4769bool hostname_is_valid(const char *s) {
4770 const char *p;
4771
4772 if (isempty(s))
4773 return false;
4774
4775 for (p = s; *p; p++)
4776 if (!hostname_valid_char(*p))
4777 return false;
4778
4779 if (p-s > HOST_NAME_MAX)
4780 return false;
4781
4782 return true;
4783}
4784
4785char* hostname_cleanup(char *s) {
4786 char *p, *d;
4787
4788 for (p = s, d = s; *p; p++)
4789 if ((*p >= 'a' && *p <= 'z') ||
4790 (*p >= 'A' && *p <= 'Z') ||
4791 (*p >= '0' && *p <= '9') ||
4792 *p == '-' ||
4793 *p == '_' ||
4794 *p == '.')
4795 *(d++) = *p;
4796
4797 *d = 0;
4798
4799 strshorten(s, HOST_NAME_MAX);
4800 return s;
4801}
4802
1325aa42
LP		 4803int pipe_eof(int fd) {
4804 struct pollfd pollfd;
4805 int r;
4806
4807 zero(pollfd);
4808 pollfd.fd = fd;
4809 pollfd.events = POLLIN|POLLHUP;
4810
4811 r = poll(&pollfd, 1, 0);
4812 if (r < 0)
4813 return -errno;
4814
4815 if (r == 0)
4816 return 0;
4817
4818 return pollfd.revents & POLLHUP;
4819}
4820
df50185b
LP		 4821int fd_wait_for_event(int fd, int event) {
4822 struct pollfd pollfd;
4823 int r;
4824
4825 zero(pollfd);
4826 pollfd.fd = fd;
4827 pollfd.events = event;
4828
4829 r = poll(&pollfd, 1, -1);
4830 if (r < 0)
4831 return -errno;
4832
4833 if (r == 0)
4834 return 0;
4835
4836 return pollfd.revents;
4837}
4838
5a3ab509
LP		 4839int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
4840 FILE *f;
4841 char *t;
4842 const char *fn;
4843 size_t k;
4844 int fd;
4845
4846 assert(path);
4847 assert(_f);
4848 assert(_temp_path);
4849
4850 t = new(char, strlen(path) + 1 + 6 + 1);
4851 if (!t)
4852 return -ENOMEM;
4853
4854 fn = file_name_from_path(path);
4855 k = fn-path;
4856 memcpy(t, path, k);
4857 t[k] = '.';
4858 stpcpy(stpcpy(t+k+1, fn), "XXXXXX");
4859
4860 fd = mkostemp(t, O_WRONLY|O_CLOEXEC);
4861 if (fd < 0) {
4862 free(t);
4863 return -errno;
4864 }
4865
4866 f = fdopen(fd, "we");
4867 if (!f) {
4868 unlink(t);
4869 free(t);
4870 return -errno;
4871 }
4872
4873 *_f = f;
4874 *_temp_path = t;
4875
4876 return 0;
4877}
4878
6ea832a2 4879int terminal_vhangup_fd(int fd) {
5a3ab509
LP		 4880 assert(fd >= 0);
4881
6ea832a2
LP		 4882 if (ioctl(fd, TIOCVHANGUP) < 0)
4883 return -errno;
4884
4885 return 0;
4886}
4887
4888int terminal_vhangup(const char *name) {
4889 int fd, r;
4890
4891 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4892 if (fd < 0)
4893 return fd;
4894
4895 r = terminal_vhangup_fd(fd);
4896 close_nointr_nofail(fd);
4897
4898 return r;
4899}
4900
4901int vt_disallocate(const char *name) {
4902 int fd, r;
4903 unsigned u;
6ea832a2
LP		 4904
4905 /* Deallocate the VT if possible. If not possible
4906 * (i.e. because it is the active one), at least clear it
4907 * entirely (including the scrollback buffer) */
4908
b83bc4e9
LP		 4909 if (!startswith(name, "/dev/"))
4910 return -EINVAL;
4911
4912 if (!tty_is_vc(name)) {
4913 /* So this is not a VT. I guess we cannot deallocate
4914 * it then. But let's at least clear the screen */
4915
4916 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4917 if (fd < 0)
4918 return fd;
4919
8585357a
LP		 4920 loop_write(fd,
4921 "\033[r" /* clear scrolling region */
4922 "\033[H" /* move home */
4923 "\033[2J", /* clear screen */
4924 10, false);
b83bc4e9
LP		 4925 close_nointr_nofail(fd);
4926
4927 return 0;
4928 }
6ea832a2
LP		 4929
4930 if (!startswith(name, "/dev/tty"))
4931 return -EINVAL;
4932
4933 r = safe_atou(name+8, &u);
4934 if (r < 0)
4935 return r;
4936
4937 if (u <= 0)
b83bc4e9 4938 return -EINVAL;
6ea832a2 4939
b83bc4e9 4940 /* Try to deallocate */
6ea832a2
LP		 4941 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
4942 if (fd < 0)
4943 return fd;
4944
4945 r = ioctl(fd, VT_DISALLOCATE, u);
b83bc4e9 4946 close_nointr_nofail(fd);
6ea832a2 4947
b83bc4e9
LP		 4948 if (r >= 0)
4949 return 0;
6ea832a2 4950
b83bc4e9 4951 if (errno != EBUSY)
6ea832a2 4952 return -errno;
6ea832a2 4953
b83bc4e9
LP		 4954 /* Couldn't deallocate, so let's clear it fully with
4955 * scrollback */
4956 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
6ea832a2 4957 if (fd < 0)
b83bc4e9 4958 return fd;
6ea832a2 4959
8585357a
LP		 4960 loop_write(fd,
4961 "\033[r" /* clear scrolling region */
4962 "\033[H" /* move home */
4963 "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */
4964 10, false);
b83bc4e9 4965 close_nointr_nofail(fd);
6ea832a2 4966
b83bc4e9 4967 return 0;
6ea832a2
LP		 4968}
4969
db1413d7
KS		 4970static int files_add(Hashmap *h, const char *path, const char *suffix) {
4971 DIR *dir;
f782b8d0 4972 struct dirent buffer, *de;
db1413d7
KS		 4973 int r = 0;
4974
4975 dir = opendir(path);
4976 if (!dir) {
4977 if (errno == ENOENT)
4978 return 0;
4979 return -errno;
4980 }
4981
f782b8d0
LP		 4982 for (;;) {
4983 int k;
223a3558 4984 char *p, *f;
f782b8d0
LP		 4985
4986 k = readdir_r(dir, &buffer, &de);
4987 if (k != 0) {
4988 r = -k;
4989 goto finish;
4990 }
4991
4992 if (!de)
4993 break;
db1413d7 4994
87d2c1ff 4995 if (!dirent_is_file_with_suffix(de, suffix))
db1413d7
KS		 4996 continue;
4997
223a3558 4998 if (asprintf(&p, "%s/%s", path, de->d_name) < 0) {
db1413d7
KS		 4999 r = -ENOMEM;
5000 goto finish;
5001 }
5002
223a3558
KS		 5003 f = canonicalize_file_name(p);
5004 if (!f) {
5005 log_error("Failed to canonicalize file name '%s': %m", p);
5006 free(p);
5007 continue;
5008 }
5009 free(p);
5010
db1413d7 5011 log_debug("found: %s\n", f);
f782b8d0 5012 if (hashmap_put(h, file_name_from_path(f), f) <= 0)
db1413d7
KS		 5013 free(f);
5014 }
5015
5016finish:
5017 closedir(dir);
5018 return r;
5019}
5020
5021static int base_cmp(const void *a, const void *b) {
5022 const char *s1, *s2;
5023
5024 s1 = *(char * const *)a;
5025 s2 = *(char * const *)b;
5026 return strcmp(file_name_from_path(s1), file_name_from_path(s2));
5027}
5028
44143309 5029int conf_files_list(char ***strv, const char *suffix, const char *dir, ...) {
223a3558
KS		 5030 Hashmap *fh = NULL;
5031 char **dirs = NULL;
db1413d7 5032 char **files = NULL;
223a3558 5033 char **p;
db1413d7 5034 va_list ap;
44143309 5035 int r = 0;
db1413d7 5036
223a3558
KS		 5037 va_start(ap, dir);
5038 dirs = strv_new_ap(dir, ap);
5039 va_end(ap);
5040 if (!dirs) {
5041 r = -ENOMEM;
5042 goto finish;
5043 }
5044 if (!strv_path_canonicalize(dirs)) {
5045 r = -ENOMEM;
5046 goto finish;
5047 }
5048 if (!strv_uniq(dirs)) {
5049 r = -ENOMEM;
5050 goto finish;
5051 }
5052
db1413d7
KS		 5053 fh = hashmap_new(string_hash_func, string_compare_func);
5054 if (!fh) {
44143309 5055 r = -ENOMEM;
db1413d7
KS		 5056 goto finish;
5057 }
5058
223a3558
KS		 5059 STRV_FOREACH(p, dirs) {
5060 if (files_add(fh, *p, suffix) < 0) {
db1413d7 5061 log_error("Failed to search for files.");
44143309 5062 r = -EINVAL;
db1413d7
KS		 5063 goto finish;
5064 }
db1413d7 5065 }
db1413d7
KS		 5066
5067 files = hashmap_get_strv(fh);
5068 if (files == NULL) {
5069 log_error("Failed to compose list of files.");
44143309 5070 r = -ENOMEM;
db1413d7
KS		 5071 goto finish;
5072 }
5073
5074 qsort(files, hashmap_size(fh), sizeof(char *), base_cmp);
8d0e38a2 5075
db1413d7 5076finish:
223a3558 5077 strv_free(dirs);
db1413d7 5078 hashmap_free(fh);
44143309
KS		 5079 *strv = files;
5080 return r;
db1413d7 5081}
7948c4df 5082
2076cf88 5083int hwclock_is_localtime(void) {
7948c4df 5084 FILE *f;
7948c4df
KS		 5085 bool local = false;
5086
5087 /*
5088 * The third line of adjtime is "UTC" or "LOCAL" or nothing.
5089 * # /etc/adjtime
2076cf88 5090 * 0.0 0 0
7948c4df
KS		 5091 * 0
5092 * UTC
5093 */
5094 f = fopen("/etc/adjtime", "re");
5095 if (f) {
2076cf88
LP		 5096 char line[LINE_MAX];
5097 bool b;
5098
5099 b = fgets(line, sizeof(line), f) &&
5100 fgets(line, sizeof(line), f) &&
5101 fgets(line, sizeof(line), f);
5102
7948c4df 5103 fclose(f);
2076cf88
LP		 5104
5105 if (!b)
5106 return -EIO;
5107
5108
5109 truncate_nl(line);
5110 local = streq(line, "LOCAL");
5111
5112 } else if (errno != -ENOENT)
5113 return -errno;
5114
7948c4df
KS		 5115 return local;
5116}
5117
ff4daf5a 5118int hwclock_apply_localtime_delta(int *min) {
7948c4df 5119 const struct timeval *tv_null = NULL;
2076cf88 5120 struct timespec ts;
7948c4df
KS		 5121 struct tm *tm;
5122 int minuteswest;
5123 struct timezone tz;
5124
2076cf88
LP		 5125 assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
5126 assert_se(tm = localtime(&ts.tv_sec));
7948c4df
KS		 5127 minuteswest = tm->tm_gmtoff / 60;
5128
5129 tz.tz_minuteswest = -minuteswest;
5130 tz.tz_dsttime = 0; /* DST_NONE*/
5131
5132 /*
5133 * If the hardware clock does not run in UTC, but in local time:
5134 * The very first time we set the kernel's timezone, it will warp
5135 * the clock so that it runs in UTC instead of local time.
5136 */
5137 if (settimeofday(tv_null, &tz) < 0)
5138 return -errno;
ff4daf5a
KS		 5139 if (min)
5140 *min = minuteswest;
5141 return 0;
2076cf88
LP		 5142}
5143
5144int hwclock_reset_localtime_delta(void) {
5145 const struct timeval *tv_null = NULL;
5146 struct timezone tz;
5147
5148 tz.tz_minuteswest = 0;
5149 tz.tz_dsttime = 0; /* DST_NONE*/
5150
5151 if (settimeofday(tv_null, &tz) < 0)
5152 return -errno;
5153
5154 return 0;
7948c4df
KS		 5155}
5156
5157int hwclock_get_time(struct tm *tm) {
5158 int fd;
5159 int err = 0;
5160
2076cf88
LP		 5161 assert(tm);
5162
7948c4df
KS		 5163 fd = open("/dev/rtc0", O_RDONLY|O_CLOEXEC);
5164 if (fd < 0)
5165 return -errno;
2076cf88
LP		 5166
5167 /* This leaves the timezone fields of struct tm
5168 * uninitialized! */
7948c4df
KS		 5169 if (ioctl(fd, RTC_RD_TIME, tm) < 0)
5170 err = -errno;
2076cf88
LP		 5171
5172 /* We don't now daylight saving, so we reset this in order not
5173 * to confused mktime(). */
5174 tm->tm_isdst = -1;
5175
5176 close_nointr_nofail(fd);
7948c4df
KS		 5177
5178 return err;
5179}
5180
5181int hwclock_set_time(const struct tm *tm) {
5182 int fd;
5183 int err = 0;
5184
2076cf88
LP		 5185 assert(tm);
5186
7948c4df
KS		 5187 fd = open("/dev/rtc0", O_RDONLY|O_CLOEXEC);
5188 if (fd < 0)
5189 return -errno;
2076cf88 5190
7948c4df
KS		 5191 if (ioctl(fd, RTC_SET_TIME, tm) < 0)
5192 err = -errno;
2076cf88
LP		 5193
5194 close_nointr_nofail(fd);
7948c4df
KS		 5195
5196 return err;
5197}
f41607a6 5198
34ca941c
LP		 5199int copy_file(const char *from, const char *to) {
5200 int r, fdf, fdt;
5201
5202 assert(from);
5203 assert(to);
5204
5205 fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY);
5206 if (fdf < 0)
5207 return -errno;
5208
5209 fdt = open(to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY, 0644);
5210 if (fdt < 0) {
5211 close_nointr_nofail(fdf);
5212 return -errno;
5213 }
5214
5215 for (;;) {
5216 char buf[PIPE_BUF];
5217 ssize_t n, k;
5218
5219 n = read(fdf, buf, sizeof(buf));
5220 if (n < 0) {
5221 r = -errno;
5222
5223 close_nointr_nofail(fdf);
5224 close_nointr(fdt);
5225 unlink(to);
5226
5227 return r;
5228 }
5229
5230 if (n == 0)
5231 break;
5232
5233 errno = 0;
5234 k = loop_write(fdt, buf, n, false);
5235 if (n != k) {
5236 r = k < 0 ? k : (errno ? -errno : -EIO);
5237
5238 close_nointr_nofail(fdf);
5239 close_nointr(fdt);
5240
5241 unlink(to);
5242 return r;
5243 }
5244 }
5245
5246 close_nointr_nofail(fdf);
5247 r = close_nointr(fdt);
5248
5249 if (r < 0) {
5250 unlink(to);
5251 return r;
5252 }
5253
5254 return 0;
5255}
5256
5257int symlink_or_copy(const char *from, const char *to) {
5258 char *pf = NULL, *pt = NULL;
5259 struct stat a, b;
5260 int r;
5261
5262 assert(from);
5263 assert(to);
5264
5265 if (parent_of_path(from, &pf) < 0 ||
5266 parent_of_path(to, &pt) < 0) {
5267 r = -ENOMEM;
5268 goto finish;
5269 }
5270
5271 if (stat(pf, &a) < 0 ||
5272 stat(pt, &b) < 0) {
5273 r = -errno;
5274 goto finish;
5275 }
5276
5277 if (a.st_dev != b.st_dev) {
5278 free(pf);
5279 free(pt);
5280
5281 return copy_file(from, to);
5282 }
5283
5284 if (symlink(from, to) < 0) {
5285 r = -errno;
5286 goto finish;
5287 }
5288
5289 r = 0;
5290
5291finish:
5292 free(pf);
5293 free(pt);
5294
5295 return r;
5296}
5297
5298int symlink_or_copy_atomic(const char *from, const char *to) {
5299 char *t, *x;
5300 const char *fn;
5301 size_t k;
5302 unsigned long long ull;
5303 unsigned i;
5304 int r;
5305
5306 assert(from);
5307 assert(to);
5308
5309 t = new(char, strlen(to) + 1 + 16 + 1);
5310 if (!t)
5311 return -ENOMEM;
5312
5313 fn = file_name_from_path(to);
5314 k = fn-to;
5315 memcpy(t, to, k);
5316 t[k] = '.';
5317 x = stpcpy(t+k+1, fn);
5318
5319 ull = random_ull();
5320 for (i = 0; i < 16; i++) {
5321 *(x++) = hexchar(ull & 0xF);
5322 ull >>= 4;
5323 }
5324
5325 *x = 0;
5326
5327 r = symlink_or_copy(from, t);
5328 if (r < 0) {
5329 unlink(t);
5330 free(t);
5331 return r;
5332 }
5333
5334 if (rename(t, to) < 0) {
5335 r = -errno;
5336 unlink(t);
5337 free(t);
5338 return r;
5339 }
5340
5341 free(t);
5342 return r;
5343}
5344
98a28fef 5345int audit_session_from_pid(pid_t pid, uint32_t *id) {
87d2c1ff 5346 char *s;
98a28fef
LP		 5347 uint32_t u;
5348 int r;
5349
98a28fef
LP		 5350 assert(id);
5351
5352 if (have_effective_cap(CAP_AUDIT_CONTROL) <= 0)
5353 return -ENOENT;
5354
87d2c1ff
LP		 5355 if (pid == 0)
5356 r = read_one_line_file("/proc/self/sessionid", &s);
5357 else {
5358 char *p;
5359
5360 if (asprintf(&p, "/proc/%lu/sessionid", (unsigned long) pid) < 0)
5361 return -ENOMEM;
5362
5363 r = read_one_line_file(p, &s);
5364 free(p);
5365 }
98a28fef 5366
98a28fef
LP		 5367 if (r < 0)
5368 return r;
5369
5370 r = safe_atou32(s, &u);
5371 free(s);
5372
5373 if (r < 0)
5374 return r;
5375
5376 if (u == (uint32_t) -1 || u <= 0)
5377 return -ENOENT;
5378
5379 *id = u;
5380 return 0;
5381}
5382
87d2c1ff
LP		 5383int audit_loginuid_from_pid(pid_t pid, uid_t *uid) {
5384 char *s;
5385 uid_t u;
5386 int r;
5387
5388 assert(uid);
5389
5390 /* Only use audit login uid if we are executed with sufficient
5391 * capabilities so that pam_loginuid could do its job. If we
5392 * are lacking the CAP_AUDIT_CONTROL capabality we most likely
5393 * are being run in a container and /proc/self/loginuid is
5394 * useless since it probably contains a uid of the host
5395 * system. */
5396
5397 if (have_effective_cap(CAP_AUDIT_CONTROL) <= 0)
5398 return -ENOENT;
5399
5400 if (pid == 0)
5401 r = read_one_line_file("/proc/self/loginuid", &s);
5402 else {
5403 char *p;
5404
5405 if (asprintf(&p, "/proc/%lu/loginuid", (unsigned long) pid) < 0)
5406 return -ENOMEM;
5407
5408 r = read_one_line_file(p, &s);
5409 free(p);
5410 }
5411
5412 if (r < 0)
5413 return r;
5414
5415 r = parse_uid(s, &u);
5416 free(s);
5417
5418 if (r < 0)
5419 return r;
5420
5421 if (u == (uid_t) -1)
5422 return -ENOENT;
5423
5424 *uid = (uid_t) u;
5425 return 0;
5426}
5427
4d6d6518
LP		 5428bool display_is_local(const char *display) {
5429 assert(display);
5430
5431 return
5432 display[0] == ':' &&
5433 display[1] >= '0' &&
5434 display[1] <= '9';
5435}
5436
5437int socket_from_display(const char *display, char **path) {
5438 size_t k;
5439 char *f, *c;
5440
5441 assert(display);
5442 assert(path);
5443
5444 if (!display_is_local(display))
5445 return -EINVAL;
5446
5447 k = strspn(display+1, "0123456789");
5448
5449 f = new(char, sizeof("/tmp/.X11-unix/X") + k);
5450 if (!f)
5451 return -ENOMEM;
5452
5453 c = stpcpy(f, "/tmp/.X11-unix/X");
5454 memcpy(c, display+1, k);
5455 c[k] = 0;
5456
5457 *path = f;
5458
5459 return 0;
5460}
5461
1cccf435
MV		 5462int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) {
5463 struct passwd *p;
ddd88763 5464 uid_t u;
1cccf435
MV		 5465
5466 assert(username);
5467 assert(*username);
1cccf435
MV		 5468
5469 /* We enforce some special rules for uid=0: in order to avoid
5470 * NSS lookups for root we hardcode its data. */
5471
5472 if (streq(*username, "root") || streq(*username, "0")) {
5473 *username = "root";
4b67834e
LP		 5474
5475 if (uid)
5476 *uid = 0;
5477
5478 if (gid)
5479 *gid = 0;
5480
5481 if (home)
5482 *home = "/root";
1cccf435
MV		 5483 return 0;
5484 }
5485
ddd88763 5486 if (parse_uid(*username, &u) >= 0) {
1cccf435 5487 errno = 0;
ddd88763 5488 p = getpwuid(u);
1cccf435
MV		 5489
5490 /* If there are multiple users with the same id, make
5491 * sure to leave $USER to the configured value instead
5492 * of the first occurrence in the database. However if
5493 * the uid was configured by a numeric uid, then let's
5494 * pick the real username from /etc/passwd. */
5495 if (p)
5496 *username = p->pw_name;
5497 } else {
5498 errno = 0;
5499 p = getpwnam(*username);
5500 }
5501
5502 if (!p)
5503 return errno != 0 ? -errno : -ESRCH;
5504
4b67834e
LP		 5505 if (uid)
5506 *uid = p->pw_uid;
5507
5508 if (gid)
5509 *gid = p->pw_gid;
5510
5511 if (home)
5512 *home = p->pw_dir;
5513
5514 return 0;
5515}
5516
5517int get_group_creds(const char **groupname, gid_t *gid) {
5518 struct group *g;
5519 gid_t id;
5520
5521 assert(groupname);
5522
5523 /* We enforce some special rules for gid=0: in order to avoid
5524 * NSS lookups for root we hardcode its data. */
5525
5526 if (streq(*groupname, "root") || streq(*groupname, "0")) {
5527 *groupname = "root";
5528
5529 if (gid)
5530 *gid = 0;
5531
5532 return 0;
5533 }
5534
5535 if (parse_gid(*groupname, &id) >= 0) {
5536 errno = 0;
5537 g = getgrgid(id);
5538
5539 if (g)
5540 *groupname = g->gr_name;
5541 } else {
5542 errno = 0;
5543 g = getgrnam(*groupname);
5544 }
5545
5546 if (!g)
5547 return errno != 0 ? -errno : -ESRCH;
5548
5549 if (gid)
5550 *gid = g->gr_gid;
5551
1cccf435
MV		 5552 return 0;
5553}
5554
8092a428
LP		 5555int glob_exists(const char *path) {
5556 glob_t g;
5557 int r, k;
5558
5559 assert(path);
5560
5561 zero(g);
5562 errno = 0;
5563 k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
5564
5565 if (k == GLOB_NOMATCH)
5566 r = 0;
5567 else if (k == GLOB_NOSPACE)
5568 r = -ENOMEM;
5569 else if (k == 0)
5570 r = !strv_isempty(g.gl_pathv);
5571 else
5572 r = errno ? -errno : -EIO;
5573
5574 globfree(&g);
5575
5576 return r;
5577}
5578
83096483
LP		 5579int dirent_ensure_type(DIR *d, struct dirent *de) {
5580 struct stat st;
5581
5582 assert(d);
5583 assert(de);
5584
5585 if (de->d_type != DT_UNKNOWN)
5586 return 0;
5587
5588 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
5589 return -errno;
5590
5591 de->d_type =
5592 S_ISREG(st.st_mode) ? DT_REG :
5593 S_ISDIR(st.st_mode) ? DT_DIR :
5594 S_ISLNK(st.st_mode) ? DT_LNK :
5595 S_ISFIFO(st.st_mode) ? DT_FIFO :
5596 S_ISSOCK(st.st_mode) ? DT_SOCK :
5597 S_ISCHR(st.st_mode) ? DT_CHR :
5598 S_ISBLK(st.st_mode) ? DT_BLK :
5599 DT_UNKNOWN;
5600
5601 return 0;
5602}
5603
5604int in_search_path(const char *path, char **search) {
5605 char **i, *parent;
5606 int r;
5607
5608 r = parent_of_path(path, &parent);
5609 if (r < 0)
5610 return r;
5611
5612 r = 0;
5613
5614 STRV_FOREACH(i, search) {
5615 if (path_equal(parent, *i)) {
5616 r = 1;
5617 break;
5618 }
5619 }
5620
5621 free(parent);
5622
5623 return r;
5624}
5625
034a2a52
LP		 5626int get_files_in_directory(const char *path, char ***list) {
5627 DIR *d;
5628 int r = 0;
5629 unsigned n = 0;
5630 char **l = NULL;
5631
5632 assert(path);
d60ef526
LP		 5633
5634 /* Returns all files in a directory in *list, and the number
5635 * of files as return value. If list is NULL returns only the
5636 * number */
034a2a52
LP		 5637
5638 d = opendir(path);
8ea913b2
LP		 5639 if (!d)
5640 return -errno;
5641
034a2a52
LP		 5642 for (;;) {
5643 struct dirent buffer, *de;
5644 int k;
5645
5646 k = readdir_r(d, &buffer, &de);
5647 if (k != 0) {
5648 r = -k;
5649 goto finish;
5650 }
5651
5652 if (!de)
5653 break;
5654
5655 dirent_ensure_type(d, de);
5656
5657 if (!dirent_is_file(de))
5658 continue;
5659
d60ef526
LP		 5660 if (list) {
5661 if ((unsigned) r >= n) {
5662 char **t;
034a2a52 5663
d60ef526
LP		 5664 n = MAX(16, 2*r);
5665 t = realloc(l, sizeof(char*) * n);
5666 if (!t) {
5667 r = -ENOMEM;
5668 goto finish;
5669 }
034a2a52 5670
d60ef526
LP		 5671 l = t;
5672 }
034a2a52 5673
d60ef526 5674 assert((unsigned) r < n);
034a2a52 5675
d60ef526
LP		 5676 l[r] = strdup(de->d_name);
5677 if (!l[r]) {
5678 r = -ENOMEM;
5679 goto finish;
5680 }
034a2a52 5681
d60ef526
LP		 5682 l[++r] = NULL;
5683 } else
5684 r++;
034a2a52
LP		 5685 }
5686
5687finish:
5688 if (d)
5689 closedir(d);
5690
d60ef526
LP		 5691 if (r >= 0) {
5692 if (list)
5693 *list = l;
5694 } else
034a2a52
LP		 5695 strv_free(l);
5696
5697 return r;
5698}
5699
911a4828
LP		 5700char *join(const char *x, ...) {
5701 va_list ap;
5702 size_t l;
5703 char *r, *p;
5704
5705 va_start(ap, x);
5706
5707 if (x) {
5708 l = strlen(x);
5709
5710 for (;;) {
5711 const char *t;
5712
5713 t = va_arg(ap, const char *);
5714 if (!t)
5715 break;
5716
5717 l += strlen(t);
5718 }
5719 } else
5720 l = 0;
5721
5722 va_end(ap);
5723
5724 r = new(char, l+1);
5725 if (!r)
5726 return NULL;
5727
5728 if (x) {
5729 p = stpcpy(r, x);
5730
5731 va_start(ap, x);
5732
5733 for (;;) {
5734 const char *t;
5735
5736 t = va_arg(ap, const char *);
5737 if (!t)
5738 break;
5739
5740 p = stpcpy(p, t);
5741 }
8ea913b2
LP		 5742
5743 va_end(ap);
911a4828
LP		 5744 } else
5745 r[0] = 0;
5746
5747 return r;
5748}
5749
b636465b
LP		 5750bool is_main_thread(void) {
5751 static __thread int cached = 0;
5752
5753 if (_unlikely_(cached == 0))
5754 cached = getpid() == gettid() ? 1 : -1;
5755
5756 return cached > 0;
5757}
5758
94959f0f
LP		 5759int block_get_whole_disk(dev_t d, dev_t *ret) {
5760 char *p, *s;
5761 int r;
5762 unsigned n, m;
5763
5764 assert(ret);
5765
5766 /* If it has a queue this is good enough for us */
5767 if (asprintf(&p, "/sys/dev/block/%u:%u/queue", major(d), minor(d)) < 0)
5768 return -ENOMEM;
5769
5770 r = access(p, F_OK);
5771 free(p);
5772
5773 if (r >= 0) {
5774 *ret = d;
5775 return 0;
5776 }
5777
5778 /* If it is a partition find the originating device */
5779 if (asprintf(&p, "/sys/dev/block/%u:%u/partition", major(d), minor(d)) < 0)
5780 return -ENOMEM;
5781
5782 r = access(p, F_OK);
5783 free(p);
5784
5785 if (r < 0)
5786 return -ENOENT;
5787
5788 /* Get parent dev_t */
5789 if (asprintf(&p, "/sys/dev/block/%u:%u/../dev", major(d), minor(d)) < 0)
5790 return -ENOMEM;
5791
5792 r = read_one_line_file(p, &s);
5793 free(p);
5794
5795 if (r < 0)
5796 return r;
5797
5798 r = sscanf(s, "%u:%u", &m, &n);
5799 free(s);
5800
5801 if (r != 2)
5802 return -EINVAL;
5803
5804 /* Only return this if it is really good enough for us. */
5805 if (asprintf(&p, "/sys/dev/block/%u:%u/queue", m, n) < 0)
5806 return -ENOMEM;
5807
5808 r = access(p, F_OK);
5809 free(p);
5810
5811 if (r >= 0) {
5812 *ret = makedev(m, n);
5813 return 0;
5814 }
5815
5816 return -ENOENT;
5817}
5818
8d53b453 5819int file_is_priv_sticky(const char *p) {
ad293f5a
LP		 5820 struct stat st;
5821
5822 assert(p);
5823
5824 if (lstat(p, &st) < 0)
5825 return -errno;
5826
5827 return
8d53b453 5828 (st.st_uid == 0 || st.st_uid == getuid()) &&
ad293f5a
LP		 5829 (st.st_mode & S_ISVTX);
5830}
94959f0f 5831
f41607a6
LP		 5832static const char *const ioprio_class_table[] = {
5833 [IOPRIO_CLASS_NONE] = "none",
5834 [IOPRIO_CLASS_RT] = "realtime",
5835 [IOPRIO_CLASS_BE] = "best-effort",
5836 [IOPRIO_CLASS_IDLE] = "idle"
5837};
5838
5839DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int);
5840
5841static const char *const sigchld_code_table[] = {
5842 [CLD_EXITED] = "exited",
5843 [CLD_KILLED] = "killed",
5844 [CLD_DUMPED] = "dumped",
5845 [CLD_TRAPPED] = "trapped",
5846 [CLD_STOPPED] = "stopped",
5847 [CLD_CONTINUED] = "continued",
5848};
5849
5850DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
5851
5852static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = {
5853 [LOG_FAC(LOG_KERN)] = "kern",
5854 [LOG_FAC(LOG_USER)] = "user",
5855 [LOG_FAC(LOG_MAIL)] = "mail",
5856 [LOG_FAC(LOG_DAEMON)] = "daemon",
5857 [LOG_FAC(LOG_AUTH)] = "auth",
5858 [LOG_FAC(LOG_SYSLOG)] = "syslog",
5859 [LOG_FAC(LOG_LPR)] = "lpr",
5860 [LOG_FAC(LOG_NEWS)] = "news",
5861 [LOG_FAC(LOG_UUCP)] = "uucp",
5862 [LOG_FAC(LOG_CRON)] = "cron",
5863 [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
5864 [LOG_FAC(LOG_FTP)] = "ftp",
5865 [LOG_FAC(LOG_LOCAL0)] = "local0",
5866 [LOG_FAC(LOG_LOCAL1)] = "local1",
5867 [LOG_FAC(LOG_LOCAL2)] = "local2",
5868 [LOG_FAC(LOG_LOCAL3)] = "local3",
5869 [LOG_FAC(LOG_LOCAL4)] = "local4",
5870 [LOG_FAC(LOG_LOCAL5)] = "local5",
5871 [LOG_FAC(LOG_LOCAL6)] = "local6",
5872 [LOG_FAC(LOG_LOCAL7)] = "local7"
5873};
5874
5875DEFINE_STRING_TABLE_LOOKUP(log_facility_unshifted, int);
5876
5877static const char *const log_level_table[] = {
5878 [LOG_EMERG] = "emerg",
5879 [LOG_ALERT] = "alert",
5880 [LOG_CRIT] = "crit",
5881 [LOG_ERR] = "err",
5882 [LOG_WARNING] = "warning",
5883 [LOG_NOTICE] = "notice",
5884 [LOG_INFO] = "info",
5885 [LOG_DEBUG] = "debug"
5886};
5887
5888DEFINE_STRING_TABLE_LOOKUP(log_level, int);
5889
5890static const char* const sched_policy_table[] = {
5891 [SCHED_OTHER] = "other",
5892 [SCHED_BATCH] = "batch",
5893 [SCHED_IDLE] = "idle",
5894 [SCHED_FIFO] = "fifo",
5895 [SCHED_RR] = "rr"
5896};
5897
5898DEFINE_STRING_TABLE_LOOKUP(sched_policy, int);
5899
5900static const char* const rlimit_table[] = {
5901 [RLIMIT_CPU] = "LimitCPU",
5902 [RLIMIT_FSIZE] = "LimitFSIZE",
5903 [RLIMIT_DATA] = "LimitDATA",
5904 [RLIMIT_STACK] = "LimitSTACK",
5905 [RLIMIT_CORE] = "LimitCORE",
5906 [RLIMIT_RSS] = "LimitRSS",
5907 [RLIMIT_NOFILE] = "LimitNOFILE",
5908 [RLIMIT_AS] = "LimitAS",
5909 [RLIMIT_NPROC] = "LimitNPROC",
5910 [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
5911 [RLIMIT_LOCKS] = "LimitLOCKS",
5912 [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
5913 [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
5914 [RLIMIT_NICE] = "LimitNICE",
5915 [RLIMIT_RTPRIO] = "LimitRTPRIO",
5916 [RLIMIT_RTTIME] = "LimitRTTIME"
5917};
5918
5919DEFINE_STRING_TABLE_LOOKUP(rlimit, int);
5920
5921static const char* const ip_tos_table[] = {
5922 [IPTOS_LOWDELAY] = "low-delay",
5923 [IPTOS_THROUGHPUT] = "throughput",
5924 [IPTOS_RELIABILITY] = "reliability",
5925 [IPTOS_LOWCOST] = "low-cost",
5926};
5927
5928DEFINE_STRING_TABLE_LOOKUP(ip_tos, int);
5929
4e240ab0 5930static const char *const __signal_table[] = {
f41607a6
LP		 5931 [SIGHUP] = "HUP",
5932 [SIGINT] = "INT",
5933 [SIGQUIT] = "QUIT",
5934 [SIGILL] = "ILL",
5935 [SIGTRAP] = "TRAP",
5936 [SIGABRT] = "ABRT",
5937 [SIGBUS] = "BUS",
5938 [SIGFPE] = "FPE",
5939 [SIGKILL] = "KILL",
5940 [SIGUSR1] = "USR1",
5941 [SIGSEGV] = "SEGV",
5942 [SIGUSR2] = "USR2",
5943 [SIGPIPE] = "PIPE",
5944 [SIGALRM] = "ALRM",
5945 [SIGTERM] = "TERM",
5946#ifdef SIGSTKFLT
5947 [SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */
5948#endif
5949 [SIGCHLD] = "CHLD",
5950 [SIGCONT] = "CONT",
5951 [SIGSTOP] = "STOP",
5952 [SIGTSTP] = "TSTP",
5953 [SIGTTIN] = "TTIN",
5954 [SIGTTOU] = "TTOU",
5955 [SIGURG] = "URG",
5956 [SIGXCPU] = "XCPU",
5957 [SIGXFSZ] = "XFSZ",
5958 [SIGVTALRM] = "VTALRM",
5959 [SIGPROF] = "PROF",
5960 [SIGWINCH] = "WINCH",
5961 [SIGIO] = "IO",
5962 [SIGPWR] = "PWR",
5963 [SIGSYS] = "SYS"
5964};
5965
4e240ab0
MS		 5966DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int);
5967
5968const char *signal_to_string(int signo) {
5969 static __thread char buf[12];
5970 const char *name;
5971
5972 name = __signal_to_string(signo);
5973 if (name)
5974 return name;
5975
5976 if (signo >= SIGRTMIN && signo <= SIGRTMAX)
5977 snprintf(buf, sizeof(buf) - 1, "RTMIN+%d", signo - SIGRTMIN);
5978 else
5979 snprintf(buf, sizeof(buf) - 1, "%d", signo);
5980 char_array_0(buf);
5981 return buf;
5982}
5983
5984int signal_from_string(const char *s) {
5985 int signo;
5986 int offset = 0;
5987 unsigned u;
5988
5989 signo =__signal_from_string(s);
5990 if (signo > 0)
5991 return signo;
5992
5993 if (startswith(s, "RTMIN+")) {
5994 s += 6;
5995 offset = SIGRTMIN;
5996 }
5997 if (safe_atou(s, &u) >= 0) {
5998 signo = (int) u + offset;
5999 if (signo > 0 && signo < _NSIG)
6000 return signo;
6001 }
6002 return -1;
6003}
65457142
FC		 6004
6005bool kexec_loaded(void) {
6006 bool loaded = false;
6007 char *s;
6008
6009 if (read_one_line_file("/sys/kernel/kexec_loaded", &s) >= 0) {
6010 if (s[0] == '1')
6011 loaded = true;
6012 free(s);
6013 }
6014 return loaded;
6015}
fb9de93d
LP		 6016
6017int strdup_or_null(const char *a, char **b) {
6018 char *c;
6019
6020 assert(b);
6021
6022 if (!a) {
6023 *b = NULL;
6024 return 0;
6025 }
6026
6027 c = strdup(a);
6028 if (!c)
6029 return -ENOMEM;
6030
6031 *b = c;
6032 return 0;
6033}
64685e0c 6034
87d2c1ff
LP		 6035int prot_from_flags(int flags) {
6036
6037 switch (flags & O_ACCMODE) {
6038
6039 case O_RDONLY:
6040 return PROT_READ;
6041
6042 case O_WRONLY:
6043 return PROT_WRITE;
6044
6045 case O_RDWR:
6046 return PROT_READ|PROT_WRITE;
6047
6048 default:
6049 return -EINVAL;
6050 }
7c99e0c1 6051}
689b9a22 6052
64685e0c
LP		 6053unsigned long cap_last_cap(void) {
6054 static __thread unsigned long saved;
6055 static __thread bool valid = false;
6056 unsigned long p;
6057
6058 if (valid)
6059 return saved;
6060
6061 p = (unsigned long) CAP_LAST_CAP;
6062
6063 if (prctl(PR_CAPBSET_READ, p) < 0) {
6064
6065 /* Hmm, look downwards, until we find one that
6066 * works */
6067 for (p--; p > 0; p --)
6068 if (prctl(PR_CAPBSET_READ, p) >= 0)
6069 break;
6070
6071 } else {
6072
6073 /* Hmm, look upwards, until we find one that doesn't
6074 * work */
6075 for (;; p++)
6076 if (prctl(PR_CAPBSET_READ, p+1) < 0)
6077 break;
6078 }
6079
6080 saved = p;
6081 valid = true;
6082
6083 return p;
6084}
babfc091
LP		 6085
6086char *format_bytes(char *buf, size_t l, off_t t) {
c0f99c21 6087 unsigned i;
babfc091
LP		 6088
6089 static const struct {
6090 const char *suffix;
6091 off_t factor;
6092 } table[] = {
32895bb3
LP		 6093 { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
6094 { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
babfc091
LP		 6095 { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
6096 { "G", 1024ULL*1024ULL*1024ULL },
6097 { "M", 1024ULL*1024ULL },
6098 { "K", 1024ULL },
6099 };
6100
6101 for (i = 0; i < ELEMENTSOF(table); i++) {
6102
6103 if (t >= table[i].factor) {
6104 snprintf(buf, l,
6105 "%llu.%llu%s",
6106 (unsigned long long) (t / table[i].factor),
6107 (unsigned long long) (((t*10ULL) / table[i].factor) % 10ULL),
6108 table[i].suffix);
6109
6110 goto finish;
6111 }
6112 }
6113
6114 snprintf(buf, l, "%lluB", (unsigned long long) t);
6115
6116finish:
6117 buf[l-1] = 0;
6118 return buf;
6119
6120}
55d7bfc1
LP		 6121
6122void* memdup(const void *p, size_t l) {
6123 void *r;
6124
6125 assert(p);
6126
6127 r = malloc(l);
6128 if (!r)
6129 return NULL;
6130
6131 memcpy(r, p, l);
6132 return r;
6133}
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