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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))) {
520 r = -errno;
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))) {
565 r = -errno;
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))) {
712 r = -errno;
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
fab56fc5
LP		 1122char *strnappend(const char *s, const char *suffix, size_t b) {
1123 size_t a;
44d8db9e
LP		 1124 char *r;
1125
fab56fc5
LP		 1126 if (!s && !suffix)
1127 return strdup("");
1128
1129 if (!s)
1130 return strndup(suffix, b);
1131
1132 if (!suffix)
1133 return strdup(s);
1134
44d8db9e
LP		 1135 assert(s);
1136 assert(suffix);
1137
1138 a = strlen(s);
44d8db9e
LP		 1139
1140 if (!(r = new(char, a+b+1)))
1141 return NULL;
1142
1143 memcpy(r, s, a);
1144 memcpy(r+a, suffix, b);
1145 r[a+b] = 0;
1146
1147 return r;
1148}
87f0e418 1149
fab56fc5
LP		 1150char *strappend(const char *s, const char *suffix) {
1151 return strnappend(s, suffix, suffix ? strlen(suffix) : 0);
1152}
1153
87f0e418
LP		 1154int readlink_malloc(const char *p, char **r) {
1155 size_t l = 100;
1156
1157 assert(p);
1158 assert(r);
1159
1160 for (;;) {
1161 char *c;
1162 ssize_t n;
1163
1164 if (!(c = new(char, l)))
1165 return -ENOMEM;
1166
1167 if ((n = readlink(p, c, l-1)) < 0) {
1168 int ret = -errno;
1169 free(c);
1170 return ret;
1171 }
1172
1173 if ((size_t) n < l-1) {
1174 c[n] = 0;
1175 *r = c;
1176 return 0;
1177 }
1178
1179 free(c);
1180 l *= 2;
1181 }
1182}
1183
2c7108c4
LP		 1184int readlink_and_make_absolute(const char *p, char **r) {
1185 char *target, *k;
1186 int j;
1187
1188 assert(p);
1189 assert(r);
1190
1191 if ((j = readlink_malloc(p, &target)) < 0)
1192 return j;
1193
1194 k = file_in_same_dir(p, target);
1195 free(target);
1196
1197 if (!k)
1198 return -ENOMEM;
1199
1200 *r = k;
1201 return 0;
1202}
1203
83096483
LP		 1204int readlink_and_canonicalize(const char *p, char **r) {
1205 char *t, *s;
1206 int j;
1207
1208 assert(p);
1209 assert(r);
1210
1211 j = readlink_and_make_absolute(p, &t);
1212 if (j < 0)
1213 return j;
1214
1215 s = canonicalize_file_name(t);
1216 if (s) {
1217 free(t);
1218 *r = s;
1219 } else
1220 *r = t;
1221
1222 path_kill_slashes(*r);
1223
1224 return 0;
1225}
1226
35d2e7ec
LP		 1227int parent_of_path(const char *path, char **_r) {
1228 const char *e, *a = NULL, *b = NULL, *p;
1229 char *r;
1230 bool slash = false;
1231
1232 assert(path);
1233 assert(_r);
1234
1235 if (!*path)
1236 return -EINVAL;
1237
1238 for (e = path; *e; e++) {
1239
1240 if (!slash && *e == '/') {
1241 a = b;
1242 b = e;
1243 slash = true;
1244 } else if (slash && *e != '/')
1245 slash = false;
1246 }
1247
1248 if (*(e-1) == '/')
1249 p = a;
1250 else
1251 p = b;
1252
1253 if (!p)
1254 return -EINVAL;
1255
1256 if (p == path)
1257 r = strdup("/");
1258 else
1259 r = strndup(path, p-path);
1260
1261 if (!r)
1262 return -ENOMEM;
1263
1264 *_r = r;
1265 return 0;
1266}
1267
1268
87f0e418
LP		 1269char *file_name_from_path(const char *p) {
1270 char *r;
1271
1272 assert(p);
1273
1274 if ((r = strrchr(p, '/')))
1275 return r + 1;
1276
1277 return (char*) p;
1278}
0301abf4
LP		 1279
1280bool path_is_absolute(const char *p) {
1281 assert(p);
1282
1283 return p[0] == '/';
1284}
1285
1286bool is_path(const char *p) {
1287
1288 return !!strchr(p, '/');
1289}
1290
1291char *path_make_absolute(const char *p, const char *prefix) {
0301abf4
LP		 1292 assert(p);
1293
65d2ebdc
LP		 1294 /* Makes every item in the list an absolute path by prepending
1295 * the prefix, if specified and necessary */
1296
0301abf4
LP		 1297 if (path_is_absolute(p) || !prefix)
1298 return strdup(p);
1299
44d91056 1300 return join(prefix, "/", p, NULL);
0301abf4 1301}
2a987ee8 1302
65d2ebdc
LP		 1303char *path_make_absolute_cwd(const char *p) {
1304 char *cwd, *r;
1305
1306 assert(p);
1307
1308 /* Similar to path_make_absolute(), but prefixes with the
1309 * current working directory. */
1310
1311 if (path_is_absolute(p))
1312 return strdup(p);
1313
1314 if (!(cwd = get_current_dir_name()))
1315 return NULL;
1316
1317 r = path_make_absolute(p, cwd);
1318 free(cwd);
1319
1320 return r;
1321}
1322
1323char **strv_path_make_absolute_cwd(char **l) {
1324 char **s;
1325
1326 /* Goes through every item in the string list and makes it
1327 * absolute. This works in place and won't rollback any
1328 * changes on failure. */
1329
1330 STRV_FOREACH(s, l) {
1331 char *t;
1332
1333 if (!(t = path_make_absolute_cwd(*s)))
1334 return NULL;
1335
1336 free(*s);
1337 *s = t;
1338 }
1339
1340 return l;
1341}
1342
c3f6d675
LP		 1343char **strv_path_canonicalize(char **l) {
1344 char **s;
1345 unsigned k = 0;
1346 bool enomem = false;
1347
1348 if (strv_isempty(l))
1349 return l;
1350
1351 /* Goes through every item in the string list and canonicalize
1352 * the path. This works in place and won't rollback any
1353 * changes on failure. */
1354
1355 STRV_FOREACH(s, l) {
1356 char *t, *u;
1357
1358 t = path_make_absolute_cwd(*s);
1359 free(*s);
1360
1361 if (!t) {
1362 enomem = true;
1363 continue;
1364 }
1365
1366 errno = 0;
1367 u = canonicalize_file_name(t);
1368 free(t);
1369
1370 if (!u) {
1371 if (errno == ENOMEM || !errno)
1372 enomem = true;
1373
1374 continue;
1375 }
1376
1377 l[k++] = u;
1378 }
1379
1380 l[k] = NULL;
1381
1382 if (enomem)
1383 return NULL;
1384
1385 return l;
a9dd2082
LP		 1386}
1387
1388char **strv_path_remove_empty(char **l) {
1389 char **f, **t;
1390
1391 if (!l)
1392 return NULL;
1393
1394 for (f = t = l; *f; f++) {
1395
1396 if (dir_is_empty(*f) > 0) {
1397 free(*f);
1398 continue;
1399 }
1400
1401 *(t++) = *f;
1402 }
1403
1404 *t = NULL;
1405 return l;
c3f6d675
LP		 1406}
1407
2a987ee8
LP		 1408int reset_all_signal_handlers(void) {
1409 int sig;
1410
1411 for (sig = 1; sig < _NSIG; sig++) {
1412 struct sigaction sa;
1413
1414 if (sig == SIGKILL || sig == SIGSTOP)
1415 continue;
1416
1417 zero(sa);
1418 sa.sa_handler = SIG_DFL;
431c32bf 1419 sa.sa_flags = SA_RESTART;
2a987ee8
LP		 1420
1421 /* On Linux the first two RT signals are reserved by
1422 * glibc, and sigaction() will return EINVAL for them. */
1423 if ((sigaction(sig, &sa, NULL) < 0))
1424 if (errno != EINVAL)
1425 return -errno;
1426 }
1427
8e274523 1428 return 0;
2a987ee8 1429}
4a72ff34
LP		 1430
1431char *strstrip(char *s) {
57a8eca8 1432 char *e;
4a72ff34
LP		 1433
1434 /* Drops trailing whitespace. Modifies the string in
1435 * place. Returns pointer to first non-space character */
1436
1437 s += strspn(s, WHITESPACE);
1438
57a8eca8
LP		 1439 for (e = strchr(s, 0); e > s; e --)
1440 if (!strchr(WHITESPACE, e[-1]))
1441 break;
4a72ff34 1442
57a8eca8 1443 *e = 0;
4a72ff34
LP		 1444
1445 return s;
4a72ff34
LP		 1446}
1447
ee9b5e01
LP		 1448char *delete_chars(char *s, const char *bad) {
1449 char *f, *t;
1450
1451 /* Drops all whitespace, regardless where in the string */
1452
1453 for (f = s, t = s; *f; f++) {
1454 if (strchr(bad, *f))
1455 continue;
1456
1457 *(t++) = *f;
1458 }
1459
1460 *t = 0;
1461
1462 return s;
1463}
1464
ab1f0633
LP		 1465bool in_charset(const char *s, const char* charset) {
1466 const char *i;
1467
1468 assert(s);
1469 assert(charset);
1470
1471 for (i = s; *i; i++)
1472 if (!strchr(charset, *i))
1473 return false;
1474
1475 return true;
1476}
1477
4a72ff34
LP		 1478char *file_in_same_dir(const char *path, const char *filename) {
1479 char *e, *r;
1480 size_t k;
1481
1482 assert(path);
1483 assert(filename);
1484
1485 /* This removes the last component of path and appends
1486 * filename, unless the latter is absolute anyway or the
1487 * former isn't */
1488
1489 if (path_is_absolute(filename))
1490 return strdup(filename);
1491
1492 if (!(e = strrchr(path, '/')))
1493 return strdup(filename);
1494
1495 k = strlen(filename);
1496 if (!(r = new(char, e-path+1+k+1)))
1497 return NULL;
1498
1499 memcpy(r, path, e-path+1);
1500 memcpy(r+(e-path)+1, filename, k+1);
1501
1502 return r;
1503}
fb624d04 1504
8c6db833
LP		 1505int safe_mkdir(const char *path, mode_t mode, uid_t uid, gid_t gid) {
1506 struct stat st;
1507
56cf987f 1508 if (label_mkdir(path, mode) >= 0)
8c6db833
LP		 1509 if (chmod_and_chown(path, mode, uid, gid) < 0)
1510 return -errno;
1511
1512 if (lstat(path, &st) < 0)
1513 return -errno;
1514
1515 if ((st.st_mode & 0777) != mode ||
1516 st.st_uid != uid ||
1517 st.st_gid != gid ||
1518 !S_ISDIR(st.st_mode)) {
1519 errno = EEXIST;
1520 return -errno;
1521 }
1522
1523 return 0;
1524}
1525
1526
a9f5d454
LP		 1527int mkdir_parents(const char *path, mode_t mode) {
1528 const char *p, *e;
1529
1530 assert(path);
1531
1532 /* Creates every parent directory in the path except the last
1533 * component. */
1534
1535 p = path + strspn(path, "/");
1536 for (;;) {
1537 int r;
1538 char *t;
1539
1540 e = p + strcspn(p, "/");
1541 p = e + strspn(e, "/");
1542
1543 /* Is this the last component? If so, then we're
1544 * done */
1545 if (*p == 0)
1546 return 0;
1547
1548 if (!(t = strndup(path, e - path)))
1549 return -ENOMEM;
1550
56cf987f 1551 r = label_mkdir(t, mode);
a9f5d454
LP		 1552 free(t);
1553
1554 if (r < 0 && errno != EEXIST)
1555 return -errno;
1556 }
1557}
1558
bbd67135
LP		 1559int mkdir_p(const char *path, mode_t mode) {
1560 int r;
1561
1562 /* Like mkdir -p */
1563
1564 if ((r = mkdir_parents(path, mode)) < 0)
1565 return r;
1566
56cf987f 1567 if (label_mkdir(path, mode) < 0 && errno != EEXIST)
bbd67135
LP		 1568 return -errno;
1569
1570 return 0;
1571}
1572
c32dd69b
LP		 1573int rmdir_parents(const char *path, const char *stop) {
1574 size_t l;
1575 int r = 0;
1576
1577 assert(path);
1578 assert(stop);
1579
1580 l = strlen(path);
1581
1582 /* Skip trailing slashes */
1583 while (l > 0 && path[l-1] == '/')
1584 l--;
1585
1586 while (l > 0) {
1587 char *t;
1588
1589 /* Skip last component */
1590 while (l > 0 && path[l-1] != '/')
1591 l--;
1592
1593 /* Skip trailing slashes */
1594 while (l > 0 && path[l-1] == '/')
1595 l--;
1596
1597 if (l <= 0)
1598 break;
1599
1600 if (!(t = strndup(path, l)))
1601 return -ENOMEM;
1602
1603 if (path_startswith(stop, t)) {
1604 free(t);
1605 return 0;
1606 }
1607
1608 r = rmdir(t);
1609 free(t);
1610
1611 if (r < 0)
1612 if (errno != ENOENT)
1613 return -errno;
1614 }
1615
1616 return 0;
1617}
1618
1619
fb624d04
LP		 1620char hexchar(int x) {
1621 static const char table[16] = "0123456789abcdef";
1622
1623 return table[x & 15];
1624}
4fe88d28
LP		 1625
1626int unhexchar(char c) {
1627
1628 if (c >= '0' && c <= '9')
1629 return c - '0';
1630
1631 if (c >= 'a' && c <= 'f')
ea430986 1632 return c - 'a' + 10;
4fe88d28
LP		 1633
1634 if (c >= 'A' && c <= 'F')
ea430986 1635 return c - 'A' + 10;
4fe88d28
LP		 1636
1637 return -1;
1638}
1639
1640char octchar(int x) {
1641 return '0' + (x & 7);
1642}
1643
1644int unoctchar(char c) {
1645
1646 if (c >= '0' && c <= '7')
1647 return c - '0';
1648
1649 return -1;
1650}
1651
5af98f82
LP		 1652char decchar(int x) {
1653 return '0' + (x % 10);
1654}
1655
1656int undecchar(char c) {
1657
1658 if (c >= '0' && c <= '9')
1659 return c - '0';
1660
1661 return -1;
1662}
1663
4fe88d28
LP		 1664char *cescape(const char *s) {
1665 char *r, *t;
1666 const char *f;
1667
1668 assert(s);
1669
1670 /* Does C style string escaping. */
1671
1672 if (!(r = new(char, strlen(s)*4 + 1)))
1673 return NULL;
1674
1675 for (f = s, t = r; *f; f++)
1676
1677 switch (*f) {
1678
1679 case '\a':
1680 *(t++) = '\\';
1681 *(t++) = 'a';
1682 break;
1683 case '\b':
1684 *(t++) = '\\';
1685 *(t++) = 'b';
1686 break;
1687 case '\f':
1688 *(t++) = '\\';
1689 *(t++) = 'f';
1690 break;
1691 case '\n':
1692 *(t++) = '\\';
1693 *(t++) = 'n';
1694 break;
1695 case '\r':
1696 *(t++) = '\\';
1697 *(t++) = 'r';
1698 break;
1699 case '\t':
1700 *(t++) = '\\';
1701 *(t++) = 't';
1702 break;
1703 case '\v':
1704 *(t++) = '\\';
1705 *(t++) = 'v';
1706 break;
1707 case '\\':
1708 *(t++) = '\\';
1709 *(t++) = '\\';
1710 break;
1711 case '"':
1712 *(t++) = '\\';
1713 *(t++) = '"';
1714 break;
1715 case '\'':
1716 *(t++) = '\\';
1717 *(t++) = '\'';
1718 break;
1719
1720 default:
1721 /* For special chars we prefer octal over
1722 * hexadecimal encoding, simply because glib's
1723 * g_strescape() does the same */
1724 if ((*f < ' ') || (*f >= 127)) {
1725 *(t++) = '\\';
1726 *(t++) = octchar((unsigned char) *f >> 6);
1727 *(t++) = octchar((unsigned char) *f >> 3);
1728 *(t++) = octchar((unsigned char) *f);
1729 } else
1730 *(t++) = *f;
1731 break;
1732 }
1733
1734 *t = 0;
1735
1736 return r;
1737}
1738
6febfd0d 1739char *cunescape_length(const char *s, size_t length) {
4fe88d28
LP		 1740 char *r, *t;
1741 const char *f;
1742
1743 assert(s);
1744
1745 /* Undoes C style string escaping */
1746
6febfd0d 1747 if (!(r = new(char, length+1)))
4fe88d28
LP		 1748 return r;
1749
6febfd0d 1750 for (f = s, t = r; f < s + length; f++) {
4fe88d28
LP		 1751
1752 if (*f != '\\') {
1753 *(t++) = *f;
1754 continue;
1755 }
1756
1757 f++;
1758
1759 switch (*f) {
1760
1761 case 'a':
1762 *(t++) = '\a';
1763 break;
1764 case 'b':
1765 *(t++) = '\b';
1766 break;
1767 case 'f':
1768 *(t++) = '\f';
1769 break;
1770 case 'n':
1771 *(t++) = '\n';
1772 break;
1773 case 'r':
1774 *(t++) = '\r';
1775 break;
1776 case 't':
1777 *(t++) = '\t';
1778 break;
1779 case 'v':
1780 *(t++) = '\v';
1781 break;
1782 case '\\':
1783 *(t++) = '\\';
1784 break;
1785 case '"':
1786 *(t++) = '"';
1787 break;
1788 case '\'':
1789 *(t++) = '\'';
1790 break;
1791
e167fb86
LP		 1792 case 's':
1793 /* This is an extension of the XDG syntax files */
1794 *(t++) = ' ';
1795 break;
1796
4fe88d28
LP		 1797 case 'x': {
1798 /* hexadecimal encoding */
1799 int a, b;
1800
1801 if ((a = unhexchar(f[1])) < 0 ||
1802 (b = unhexchar(f[2])) < 0) {
1803 /* Invalid escape code, let's take it literal then */
1804 *(t++) = '\\';
1805 *(t++) = 'x';
1806 } else {
1807 *(t++) = (char) ((a << 4) | b);
1808 f += 2;
1809 }
1810
1811 break;
1812 }
1813
1814 case '0':
1815 case '1':
1816 case '2':
1817 case '3':
1818 case '4':
1819 case '5':
1820 case '6':
1821 case '7': {
1822 /* octal encoding */
1823 int a, b, c;
1824
1825 if ((a = unoctchar(f[0])) < 0 ||
1826 (b = unoctchar(f[1])) < 0 ||
1827 (c = unoctchar(f[2])) < 0) {
1828 /* Invalid escape code, let's take it literal then */
1829 *(t++) = '\\';
1830 *(t++) = f[0];
1831 } else {
1832 *(t++) = (char) ((a << 6) | (b << 3) | c);
1833 f += 2;
1834 }
1835
1836 break;
1837 }
1838
1839 case 0:
1840 /* premature end of string.*/
1841 *(t++) = '\\';
1842 goto finish;
1843
1844 default:
1845 /* Invalid escape code, let's take it literal then */
1846 *(t++) = '\\';
f3d4cc01 1847 *(t++) = *f;
4fe88d28
LP		 1848 break;
1849 }
1850 }
1851
1852finish:
1853 *t = 0;
1854 return r;
1855}
1856
6febfd0d
LP		 1857char *cunescape(const char *s) {
1858 return cunescape_length(s, strlen(s));
1859}
4fe88d28
LP		 1860
1861char *xescape(const char *s, const char *bad) {
1862 char *r, *t;
1863 const char *f;
1864
1865 /* Escapes all chars in bad, in addition to \ and all special
1866 * chars, in \xFF style escaping. May be reversed with
1867 * cunescape. */
1868
1869 if (!(r = new(char, strlen(s)*4+1)))
1870 return NULL;
1871
1872 for (f = s, t = r; *f; f++) {
1873
b866264a
LP		 1874 if ((*f < ' ') || (*f >= 127) ||
1875 (*f == '\\') || strchr(bad, *f)) {
4fe88d28
LP		 1876 *(t++) = '\\';
1877 *(t++) = 'x';
1878 *(t++) = hexchar(*f >> 4);
1879 *(t++) = hexchar(*f);
1880 } else
1881 *(t++) = *f;
1882 }
1883
1884 *t = 0;
1885
1886 return r;
1887}
1888
ea430986 1889char *bus_path_escape(const char *s) {
ea430986
LP		 1890 char *r, *t;
1891 const char *f;
1892
47be870b
LP		 1893 assert(s);
1894
ea430986
LP		 1895 /* Escapes all chars that D-Bus' object path cannot deal
1896 * with. Can be reverse with bus_path_unescape() */
1897
1898 if (!(r = new(char, strlen(s)*3+1)))
1899 return NULL;
1900
1901 for (f = s, t = r; *f; f++) {
1902
1903 if (!(*f >= 'A' && *f <= 'Z') &&
1904 !(*f >= 'a' && *f <= 'z') &&
1905 !(*f >= '0' && *f <= '9')) {
1906 *(t++) = '_';
1907 *(t++) = hexchar(*f >> 4);
1908 *(t++) = hexchar(*f);
1909 } else
1910 *(t++) = *f;
1911 }
1912
1913 *t = 0;
1914
1915 return r;
1916}
1917
9e2f7c11 1918char *bus_path_unescape(const char *f) {
ea430986 1919 char *r, *t;
ea430986 1920
9e2f7c11 1921 assert(f);
47be870b 1922
9e2f7c11 1923 if (!(r = strdup(f)))
ea430986
LP		 1924 return NULL;
1925
9e2f7c11 1926 for (t = r; *f; f++) {
ea430986
LP		 1927
1928 if (*f == '_') {
1929 int a, b;
1930
1931 if ((a = unhexchar(f[1])) < 0 ||
1932 (b = unhexchar(f[2])) < 0) {
1933 /* Invalid escape code, let's take it literal then */
1934 *(t++) = '_';
1935 } else {
1936 *(t++) = (char) ((a << 4) | b);
1937 f += 2;
1938 }
1939 } else
1940 *(t++) = *f;
1941 }
1942
1943 *t = 0;
1944
1945 return r;
1946}
1947
4fe88d28
LP		 1948char *path_kill_slashes(char *path) {
1949 char *f, *t;
1950 bool slash = false;
1951
1952 /* Removes redundant inner and trailing slashes. Modifies the
1953 * passed string in-place.
1954 *
1955 * ///foo///bar/ becomes /foo/bar
1956 */
1957
1958 for (f = path, t = path; *f; f++) {
1959
1960 if (*f == '/') {
1961 slash = true;
1962 continue;
1963 }
1964
1965 if (slash) {
1966 slash = false;
1967 *(t++) = '/';
1968 }
1969
1970 *(t++) = *f;
1971 }
1972
1973 /* Special rule, if we are talking of the root directory, a
1974 trailing slash is good */
1975
1976 if (t == path && slash)
1977 *(t++) = '/';
1978
1979 *t = 0;
1980 return path;
1981}
1982
1983bool path_startswith(const char *path, const char *prefix) {
1984 assert(path);
1985 assert(prefix);
1986
1987 if ((path[0] == '/') != (prefix[0] == '/'))
1988 return false;
1989
1990 for (;;) {
1991 size_t a, b;
1992
1993 path += strspn(path, "/");
1994 prefix += strspn(prefix, "/");
1995
1996 if (*prefix == 0)
1997 return true;
1998
1999 if (*path == 0)
2000 return false;
2001
2002 a = strcspn(path, "/");
2003 b = strcspn(prefix, "/");
2004
2005 if (a != b)
2006 return false;
2007
2008 if (memcmp(path, prefix, a) != 0)
2009 return false;
2010
2011 path += a;
2012 prefix += b;
2013 }
2014}
2015
15ae422b
LP		 2016bool path_equal(const char *a, const char *b) {
2017 assert(a);
2018 assert(b);
2019
2020 if ((a[0] == '/') != (b[0] == '/'))
2021 return false;
2022
2023 for (;;) {
2024 size_t j, k;
2025
2026 a += strspn(a, "/");
2027 b += strspn(b, "/");
2028
2029 if (*a == 0 && *b == 0)
2030 return true;
2031
2032 if (*a == 0 || *b == 0)
2033 return false;
2034
2035 j = strcspn(a, "/");
2036 k = strcspn(b, "/");
2037
2038 if (j != k)
2039 return false;
2040
2041 if (memcmp(a, b, j) != 0)
2042 return false;
2043
2044 a += j;
2045 b += k;
2046 }
2047}
2048
67d51650 2049char *ascii_strlower(char *t) {
4fe88d28
LP		 2050 char *p;
2051
67d51650 2052 assert(t);
4fe88d28 2053
67d51650 2054 for (p = t; *p; p++)
4fe88d28
LP		 2055 if (*p >= 'A' && *p <= 'Z')
2056 *p = *p - 'A' + 'a';
2057
67d51650 2058 return t;
4fe88d28 2059}
1dccbe19 2060
c85dc17b
LP		 2061bool ignore_file(const char *filename) {
2062 assert(filename);
2063
2064 return
2065 filename[0] == '.' ||
6c78be3c 2066 streq(filename, "lost+found") ||
e472d476
LP		 2067 streq(filename, "aquota.user") ||
2068 streq(filename, "aquota.group") ||
c85dc17b
LP		 2069 endswith(filename, "~") ||
2070 endswith(filename, ".rpmnew") ||
2071 endswith(filename, ".rpmsave") ||
2072 endswith(filename, ".rpmorig") ||
2073 endswith(filename, ".dpkg-old") ||
2074 endswith(filename, ".dpkg-new") ||
2075 endswith(filename, ".swp");
2076}
2077
3a0ecb08
LP		 2078int fd_nonblock(int fd, bool nonblock) {
2079 int flags;
2080
2081 assert(fd >= 0);
2082
2083 if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
2084 return -errno;
2085
2086 if (nonblock)
2087 flags |= O_NONBLOCK;
2088 else
2089 flags &= ~O_NONBLOCK;
2090
2091 if (fcntl(fd, F_SETFL, flags) < 0)
2092 return -errno;
2093
2094 return 0;
2095}
2096
2097int fd_cloexec(int fd, bool cloexec) {
2098 int flags;
2099
2100 assert(fd >= 0);
2101
2102 if ((flags = fcntl(fd, F_GETFD, 0)) < 0)
2103 return -errno;
2104
2105 if (cloexec)
2106 flags |= FD_CLOEXEC;
2107 else
2108 flags &= ~FD_CLOEXEC;
2109
2110 if (fcntl(fd, F_SETFD, flags) < 0)
2111 return -errno;
2112
2113 return 0;
2114}
2115
a0d40ac5
LP		 2116int close_all_fds(const int except[], unsigned n_except) {
2117 DIR *d;
2118 struct dirent *de;
2119 int r = 0;
2120
2121 if (!(d = opendir("/proc/self/fd")))
2122 return -errno;
2123
2124 while ((de = readdir(d))) {
a7610064 2125 int fd = -1;
a0d40ac5 2126
a16e1123 2127 if (ignore_file(de->d_name))
a0d40ac5
LP		 2128 continue;
2129
720ce21d
LP		 2130 if (safe_atoi(de->d_name, &fd) < 0)
2131 /* Let's better ignore this, just in case */
2132 continue;
a0d40ac5
LP		 2133
2134 if (fd < 3)
2135 continue;
2136
2137 if (fd == dirfd(d))
2138 continue;
2139
2140 if (except) {
2141 bool found;
2142 unsigned i;
2143
2144 found = false;
2145 for (i = 0; i < n_except; i++)
2146 if (except[i] == fd) {
2147 found = true;
2148 break;
2149 }
2150
2151 if (found)
2152 continue;
2153 }
2154
720ce21d 2155 if (close_nointr(fd) < 0) {
2f357920 2156 /* Valgrind has its own FD and doesn't want to have it closed */
720ce21d
LP		 2157 if (errno != EBADF && r == 0)
2158 r = -errno;
2f357920 2159 }
a0d40ac5
LP		 2160 }
2161
a0d40ac5
LP		 2162 closedir(d);
2163 return r;
2164}
2165
db12775d
LP		 2166bool chars_intersect(const char *a, const char *b) {
2167 const char *p;
2168
2169 /* Returns true if any of the chars in a are in b. */
2170 for (p = a; *p; p++)
2171 if (strchr(b, *p))
2172 return true;
2173
2174 return false;
2175}
2176
8b6c7120
LP		 2177char *format_timestamp(char *buf, size_t l, usec_t t) {
2178 struct tm tm;
2179 time_t sec;
2180
2181 assert(buf);
2182 assert(l > 0);
2183
2184 if (t <= 0)
2185 return NULL;
2186
f872ec33 2187 sec = (time_t) (t / USEC_PER_SEC);
8b6c7120
LP		 2188
2189 if (strftime(buf, l, "%a, %d %b %Y %H:%M:%S %z", localtime_r(&sec, &tm)) <= 0)
2190 return NULL;
2191
2192 return buf;
2193}
2194
584be568
LP		 2195char *format_timestamp_pretty(char *buf, size_t l, usec_t t) {
2196 usec_t n, d;
2197
2198 n = now(CLOCK_REALTIME);
2199
2200 if (t <= 0 || t > n || t + USEC_PER_DAY*7 <= t)
2201 return NULL;
2202
2203 d = n - t;
2204
2205 if (d >= USEC_PER_YEAR)
2206 snprintf(buf, l, "%llu years and %llu months ago",
2207 (unsigned long long) (d / USEC_PER_YEAR),
2208 (unsigned long long) ((d % USEC_PER_YEAR) / USEC_PER_MONTH));
2209 else if (d >= USEC_PER_MONTH)
2210 snprintf(buf, l, "%llu months and %llu days ago",
2211 (unsigned long long) (d / USEC_PER_MONTH),
2212 (unsigned long long) ((d % USEC_PER_MONTH) / USEC_PER_DAY));
2213 else if (d >= USEC_PER_WEEK)
2214 snprintf(buf, l, "%llu weeks and %llu days ago",
2215 (unsigned long long) (d / USEC_PER_WEEK),
2216 (unsigned long long) ((d % USEC_PER_WEEK) / USEC_PER_DAY));
2217 else if (d >= 2*USEC_PER_DAY)
2218 snprintf(buf, l, "%llu days ago", (unsigned long long) (d / USEC_PER_DAY));
2219 else if (d >= 25*USEC_PER_HOUR)
2220 snprintf(buf, l, "1 day and %lluh ago",
2221 (unsigned long long) ((d - USEC_PER_DAY) / USEC_PER_HOUR));
2222 else if (d >= 6*USEC_PER_HOUR)
2223 snprintf(buf, l, "%lluh ago",
2224 (unsigned long long) (d / USEC_PER_HOUR));
2225 else if (d >= USEC_PER_HOUR)
2226 snprintf(buf, l, "%lluh %llumin ago",
2227 (unsigned long long) (d / USEC_PER_HOUR),
2228 (unsigned long long) ((d % USEC_PER_HOUR) / USEC_PER_MINUTE));
2229 else if (d >= 5*USEC_PER_MINUTE)
2230 snprintf(buf, l, "%llumin ago",
2231 (unsigned long long) (d / USEC_PER_MINUTE));
2232 else if (d >= USEC_PER_MINUTE)
2233 snprintf(buf, l, "%llumin %llus ago",
2234 (unsigned long long) (d / USEC_PER_MINUTE),
2235 (unsigned long long) ((d % USEC_PER_MINUTE) / USEC_PER_SEC));
2236 else if (d >= USEC_PER_SEC)
2237 snprintf(buf, l, "%llus ago",
2238 (unsigned long long) (d / USEC_PER_SEC));
2239 else if (d >= USEC_PER_MSEC)
2240 snprintf(buf, l, "%llums ago",
2241 (unsigned long long) (d / USEC_PER_MSEC));
2242 else if (d > 0)
2243 snprintf(buf, l, "%lluus ago",
2244 (unsigned long long) d);
2245 else
2246 snprintf(buf, l, "now");
2247
2248 buf[l-1] = 0;
2249 return buf;
2250}
2251
871d7de4
LP		 2252char *format_timespan(char *buf, size_t l, usec_t t) {
2253 static const struct {
2254 const char *suffix;
2255 usec_t usec;
2256 } table[] = {
2257 { "w", USEC_PER_WEEK },
2258 { "d", USEC_PER_DAY },
2259 { "h", USEC_PER_HOUR },
2260 { "min", USEC_PER_MINUTE },
2261 { "s", USEC_PER_SEC },
2262 { "ms", USEC_PER_MSEC },
2263 { "us", 1 },
2264 };
2265
2266 unsigned i;
2267 char *p = buf;
2268
2269 assert(buf);
2270 assert(l > 0);
2271
2272 if (t == (usec_t) -1)
2273 return NULL;
2274
4502d22c
LP		 2275 if (t == 0) {
2276 snprintf(p, l, "0");
2277 p[l-1] = 0;
2278 return p;
2279 }
2280
871d7de4
LP		 2281 /* The result of this function can be parsed with parse_usec */
2282
2283 for (i = 0; i < ELEMENTSOF(table); i++) {
2284 int k;
2285 size_t n;
2286
2287 if (t < table[i].usec)
2288 continue;
2289
2290 if (l <= 1)
2291 break;
2292
2293 k = snprintf(p, l, "%s%llu%s", p > buf ? " " : "", (unsigned long long) (t / table[i].usec), table[i].suffix);
2294 n = MIN((size_t) k, l);
2295
2296 l -= n;
2297 p += n;
2298
2299 t %= table[i].usec;
2300 }
2301
2302 *p = 0;
2303
2304 return buf;
2305}
2306
42856c10
LP		 2307bool fstype_is_network(const char *fstype) {
2308 static const char * const table[] = {
2309 "cifs",
2310 "smbfs",
2311 "ncpfs",
2312 "nfs",
ca139f94
LP		 2313 "nfs4",
2314 "gfs",
2315 "gfs2"
42856c10
LP		 2316 };
2317
2318 unsigned i;
2319
2320 for (i = 0; i < ELEMENTSOF(table); i++)
2321 if (streq(table[i], fstype))
2322 return true;
2323
2324 return false;
2325}
2326
601f6a1e
LP		 2327int chvt(int vt) {
2328 int fd, r = 0;
2329
74bc3bdc 2330 if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0)
601f6a1e
LP		 2331 return -errno;
2332
2333 if (vt < 0) {
2334 int tiocl[2] = {
2335 TIOCL_GETKMSGREDIRECT,
2336 0
2337 };
2338
678abaf9
TJ		 2339 if (ioctl(fd, TIOCLINUX, tiocl) < 0) {
2340 r = -errno;
2341 goto fail;
2342 }
601f6a1e
LP		 2343
2344 vt = tiocl[0] <= 0 ? 1 : tiocl[0];
2345 }
2346
2347 if (ioctl(fd, VT_ACTIVATE, vt) < 0)
2348 r = -errno;
2349
678abaf9
TJ		 2350fail:
2351 close_nointr_nofail(fd);
601f6a1e
LP		 2352 return r;
2353}
2354
80876c20
LP		 2355int read_one_char(FILE *f, char *ret, bool *need_nl) {
2356 struct termios old_termios, new_termios;
2357 char c;
20c03b7b 2358 char line[LINE_MAX];
80876c20
LP		 2359
2360 assert(f);
2361 assert(ret);
2362
2363 if (tcgetattr(fileno(f), &old_termios) >= 0) {
2364 new_termios = old_termios;
2365
2366 new_termios.c_lflag &= ~ICANON;
2367 new_termios.c_cc[VMIN] = 1;
2368 new_termios.c_cc[VTIME] = 0;
2369
2370 if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
2371 size_t k;
2372
2373 k = fread(&c, 1, 1, f);
2374
2375 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
2376
2377 if (k <= 0)
2378 return -EIO;
2379
2380 if (need_nl)
2381 *need_nl = c != '\n';
2382
2383 *ret = c;
2384 return 0;
2385 }
2386 }
2387
2388 if (!(fgets(line, sizeof(line), f)))
2389 return -EIO;
2390
2391 truncate_nl(line);
2392
2393 if (strlen(line) != 1)
2394 return -EBADMSG;
2395
2396 if (need_nl)
2397 *need_nl = false;
2398
2399 *ret = line[0];
2400 return 0;
2401}
2402
2403int ask(char *ret, const char *replies, const char *text, ...) {
1b39d4b9
LP		 2404 bool on_tty;
2405
80876c20
LP		 2406 assert(ret);
2407 assert(replies);
2408 assert(text);
2409
1b39d4b9
LP		 2410 on_tty = isatty(STDOUT_FILENO);
2411
80876c20
LP		 2412 for (;;) {
2413 va_list ap;
2414 char c;
2415 int r;
2416 bool need_nl = true;
2417
1b39d4b9
LP		 2418 if (on_tty)
2419 fputs("\x1B[1m", stdout);
b1b2dc0c 2420
80876c20
LP		 2421 va_start(ap, text);
2422 vprintf(text, ap);
2423 va_end(ap);
2424
1b39d4b9
LP		 2425 if (on_tty)
2426 fputs("\x1B[0m", stdout);
b1b2dc0c 2427
80876c20
LP		 2428 fflush(stdout);
2429
2430 if ((r = read_one_char(stdin, &c, &need_nl)) < 0) {
2431
2432 if (r == -EBADMSG) {
2433 puts("Bad input, please try again.");
2434 continue;
2435 }
2436
2437 putchar('\n');
2438 return r;
2439 }
2440
2441 if (need_nl)
2442 putchar('\n');
2443
2444 if (strchr(replies, c)) {
2445 *ret = c;
2446 return 0;
2447 }
2448
2449 puts("Read unexpected character, please try again.");
2450 }
2451}
2452
6ea832a2 2453int reset_terminal_fd(int fd) {
80876c20
LP		 2454 struct termios termios;
2455 int r = 0;
3fe5e5d4
LP		 2456 long arg;
2457
2458 /* Set terminal to some sane defaults */
80876c20
LP		 2459
2460 assert(fd >= 0);
2461
eed1d0e3
LP		 2462 /* We leave locked terminal attributes untouched, so that
2463 * Plymouth may set whatever it wants to set, and we don't
2464 * interfere with that. */
3fe5e5d4
LP		 2465
2466 /* Disable exclusive mode, just in case */
2467 ioctl(fd, TIOCNXCL);
2468
2469 /* Enable console unicode mode */
2470 arg = K_UNICODE;
2471 ioctl(fd, KDSKBMODE, &arg);
80876c20
LP		 2472
2473 if (tcgetattr(fd, &termios) < 0) {
2474 r = -errno;
2475 goto finish;
2476 }
2477
aaf694ca
LP		 2478 /* We only reset the stuff that matters to the software. How
2479 * hardware is set up we don't touch assuming that somebody
2480 * else will do that for us */
2481
2482 termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
80876c20
LP		 2483 termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
2484 termios.c_oflag |= ONLCR;
2485 termios.c_cflag |= CREAD;
2486 termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
2487
2488 termios.c_cc[VINTR] = 03; /* ^C */
2489 termios.c_cc[VQUIT] = 034; /* ^\ */
2490 termios.c_cc[VERASE] = 0177;
2491 termios.c_cc[VKILL] = 025; /* ^X */
2492 termios.c_cc[VEOF] = 04; /* ^D */
2493 termios.c_cc[VSTART] = 021; /* ^Q */
2494 termios.c_cc[VSTOP] = 023; /* ^S */
2495 termios.c_cc[VSUSP] = 032; /* ^Z */
2496 termios.c_cc[VLNEXT] = 026; /* ^V */
2497 termios.c_cc[VWERASE] = 027; /* ^W */
2498 termios.c_cc[VREPRINT] = 022; /* ^R */
aaf694ca
LP		 2499 termios.c_cc[VEOL] = 0;
2500 termios.c_cc[VEOL2] = 0;
80876c20
LP		 2501
2502 termios.c_cc[VTIME] = 0;
2503 termios.c_cc[VMIN] = 1;
2504
2505 if (tcsetattr(fd, TCSANOW, &termios) < 0)
2506 r = -errno;
2507
2508finish:
2509 /* Just in case, flush all crap out */
2510 tcflush(fd, TCIOFLUSH);
2511
2512 return r;
2513}
2514
6ea832a2
LP		 2515int reset_terminal(const char *name) {
2516 int fd, r;
2517
2518 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
2519 if (fd < 0)
2520 return fd;
2521
2522 r = reset_terminal_fd(fd);
2523 close_nointr_nofail(fd);
2524
2525 return r;
2526}
2527
80876c20
LP		 2528int open_terminal(const char *name, int mode) {
2529 int fd, r;
f73f76ac 2530 unsigned c = 0;
80876c20 2531
f73f76ac
LP		 2532 /*
2533 * If a TTY is in the process of being closed opening it might
2534 * cause EIO. This is horribly awful, but unlikely to be
2535 * changed in the kernel. Hence we work around this problem by
2536 * retrying a couple of times.
2537 *
2538 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
2539 */
2540
2541 for (;;) {
2542 if ((fd = open(name, mode)) >= 0)
2543 break;
2544
2545 if (errno != EIO)
2546 return -errno;
2547
2548 if (c >= 20)
2549 return -errno;
2550
2551 usleep(50 * USEC_PER_MSEC);
2552 c++;
2553 }
2554
2555 if (fd < 0)
80876c20
LP		 2556 return -errno;
2557
2558 if ((r = isatty(fd)) < 0) {
2559 close_nointr_nofail(fd);
2560 return -errno;
2561 }
2562
2563 if (!r) {
2564 close_nointr_nofail(fd);
2565 return -ENOTTY;
2566 }
2567
2568 return fd;
2569}
2570
2571int flush_fd(int fd) {
2572 struct pollfd pollfd;
2573
2574 zero(pollfd);
2575 pollfd.fd = fd;
2576 pollfd.events = POLLIN;
2577
2578 for (;;) {
20c03b7b 2579 char buf[LINE_MAX];
80876c20
LP		 2580 ssize_t l;
2581 int r;
2582
2583 if ((r = poll(&pollfd, 1, 0)) < 0) {
2584
2585 if (errno == EINTR)
2586 continue;
2587
2588 return -errno;
2589 }
2590
2591 if (r == 0)
2592 return 0;
2593
2594 if ((l = read(fd, buf, sizeof(buf))) < 0) {
2595
2596 if (errno == EINTR)
2597 continue;
2598
2599 if (errno == EAGAIN)
2600 return 0;
2601
2602 return -errno;
2603 }
2604
2605 if (l <= 0)
2606 return 0;
2607 }
2608}
2609
21de3988 2610int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm) {
bab45044 2611 int fd = -1, notify = -1, r, wd = -1;
80876c20
LP		 2612
2613 assert(name);
2614
2615 /* We use inotify to be notified when the tty is closed. We
2616 * create the watch before checking if we can actually acquire
2617 * it, so that we don't lose any event.
2618 *
2619 * Note: strictly speaking this actually watches for the
2620 * device being closed, it does *not* really watch whether a
2621 * tty loses its controlling process. However, unless some
2622 * rogue process uses TIOCNOTTY on /dev/tty *after* closing
2623 * its tty otherwise this will not become a problem. As long
2624 * as the administrator makes sure not configure any service
2625 * on the same tty as an untrusted user this should not be a
2626 * problem. (Which he probably should not do anyway.) */
2627
2628 if (!fail && !force) {
2629 if ((notify = inotify_init1(IN_CLOEXEC)) < 0) {
2630 r = -errno;
2631 goto fail;
2632 }
2633
2634 if ((wd = inotify_add_watch(notify, name, IN_CLOSE)) < 0) {
2635 r = -errno;
2636 goto fail;
2637 }
2638 }
2639
2640 for (;;) {
e3d1855b
LP		 2641 if (notify >= 0)
2642 if ((r = flush_fd(notify)) < 0)
2643 goto fail;
80876c20
LP		 2644
2645 /* We pass here O_NOCTTY only so that we can check the return
2646 * value TIOCSCTTY and have a reliable way to figure out if we
2647 * successfully became the controlling process of the tty */
6ea832a2
LP		 2648 if ((fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0)
2649 return fd;
80876c20
LP		 2650
2651 /* First, try to get the tty */
21de3988
LP		 2652 r = ioctl(fd, TIOCSCTTY, force);
2653
2654 /* Sometimes it makes sense to ignore TIOCSCTTY
2655 * returning EPERM, i.e. when very likely we already
2656 * are have this controlling terminal. */
2657 if (r < 0 && errno == EPERM && ignore_tiocstty_eperm)
2658 r = 0;
2659
2660 if (r < 0 && (force || fail || errno != EPERM)) {
80876c20
LP		 2661 r = -errno;
2662 goto fail;
2663 }
2664
2665 if (r >= 0)
2666 break;
2667
2668 assert(!fail);
2669 assert(!force);
2670 assert(notify >= 0);
2671
2672 for (;;) {
f601daa7 2673 uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
80876c20 2674 ssize_t l;
f601daa7 2675 struct inotify_event *e;
80876c20 2676
f601daa7 2677 if ((l = read(notify, &inotify_buffer, sizeof(inotify_buffer))) < 0) {
80876c20 2678
f601daa7
LP		 2679 if (errno == EINTR)
2680 continue;
2681
2682 r = -errno;
2683 goto fail;
2684 }
2685
2686 e = (struct inotify_event*) inotify_buffer;
80876c20 2687
f601daa7
LP		 2688 while (l > 0) {
2689 size_t step;
80876c20 2690
f601daa7 2691 if (e->wd != wd || !(e->mask & IN_CLOSE)) {
80876c20 2692 r = -EIO;
f601daa7
LP		 2693 goto fail;
2694 }
80876c20 2695
f601daa7
LP		 2696 step = sizeof(struct inotify_event) + e->len;
2697 assert(step <= (size_t) l);
80876c20 2698
f601daa7
LP		 2699 e = (struct inotify_event*) ((uint8_t*) e + step);
2700 l -= step;
80876c20
LP		 2701 }
2702
2703 break;
2704 }
2705
2706 /* We close the tty fd here since if the old session
2707 * ended our handle will be dead. It's important that
2708 * we do this after sleeping, so that we don't enter
2709 * an endless loop. */
2710 close_nointr_nofail(fd);
2711 }
2712
2713 if (notify >= 0)
a16e1123 2714 close_nointr_nofail(notify);
80876c20 2715
6ea832a2 2716 if ((r = reset_terminal_fd(fd)) < 0)
80876c20
LP		 2717 log_warning("Failed to reset terminal: %s", strerror(-r));
2718
2719 return fd;
2720
2721fail:
2722 if (fd >= 0)
a16e1123 2723 close_nointr_nofail(fd);
80876c20
LP		 2724
2725 if (notify >= 0)
a16e1123 2726 close_nointr_nofail(notify);
80876c20
LP		 2727
2728 return r;
2729}
2730
2731int release_terminal(void) {
2732 int r = 0, fd;
57cd2192 2733 struct sigaction sa_old, sa_new;
80876c20 2734
ccaa6149 2735 if ((fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC)) < 0)
80876c20
LP		 2736 return -errno;
2737
57cd2192
LP		 2738 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
2739 * by our own TIOCNOTTY */
2740
2741 zero(sa_new);
2742 sa_new.sa_handler = SIG_IGN;
2743 sa_new.sa_flags = SA_RESTART;
2744 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
2745
80876c20
LP		 2746 if (ioctl(fd, TIOCNOTTY) < 0)
2747 r = -errno;
2748
57cd2192
LP		 2749 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
2750
80876c20
LP		 2751 close_nointr_nofail(fd);
2752 return r;
2753}
2754
9a34ec5f
LP		 2755int sigaction_many(const struct sigaction *sa, ...) {
2756 va_list ap;
2757 int r = 0, sig;
2758
2759 va_start(ap, sa);
2760 while ((sig = va_arg(ap, int)) > 0)
2761 if (sigaction(sig, sa, NULL) < 0)
2762 r = -errno;
2763 va_end(ap);
2764
2765 return r;
2766}
2767
2768int ignore_signals(int sig, ...) {
a337c6fc 2769 struct sigaction sa;
9a34ec5f
LP		 2770 va_list ap;
2771 int r = 0;
a337c6fc
LP		 2772
2773 zero(sa);
2774 sa.sa_handler = SIG_IGN;
2775 sa.sa_flags = SA_RESTART;
2776
9a34ec5f
LP		 2777 if (sigaction(sig, &sa, NULL) < 0)
2778 r = -errno;
2779
2780 va_start(ap, sig);
2781 while ((sig = va_arg(ap, int)) > 0)
2782 if (sigaction(sig, &sa, NULL) < 0)
2783 r = -errno;
2784 va_end(ap);
2785
2786 return r;
2787}
2788
2789int default_signals(int sig, ...) {
2790 struct sigaction sa;
2791 va_list ap;
2792 int r = 0;
2793
2794 zero(sa);
2795 sa.sa_handler = SIG_DFL;
2796 sa.sa_flags = SA_RESTART;
2797
2798 if (sigaction(sig, &sa, NULL) < 0)
2799 r = -errno;
2800
2801 va_start(ap, sig);
2802 while ((sig = va_arg(ap, int)) > 0)
2803 if (sigaction(sig, &sa, NULL) < 0)
2804 r = -errno;
2805 va_end(ap);
2806
2807 return r;
a337c6fc
LP		 2808}
2809
8d567588
LP		 2810int close_pipe(int p[]) {
2811 int a = 0, b = 0;
2812
2813 assert(p);
2814
2815 if (p[0] >= 0) {
2816 a = close_nointr(p[0]);
2817 p[0] = -1;
2818 }
2819
2820 if (p[1] >= 0) {
2821 b = close_nointr(p[1]);
2822 p[1] = -1;
2823 }
2824
2825 return a < 0 ? a : b;
2826}
2827
eb22ac37 2828ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) {
8d567588
LP		 2829 uint8_t *p;
2830 ssize_t n = 0;
2831
2832 assert(fd >= 0);
2833 assert(buf);
2834
2835 p = buf;
2836
2837 while (nbytes > 0) {
2838 ssize_t k;
2839
2840 if ((k = read(fd, p, nbytes)) <= 0) {
2841
eb22ac37 2842 if (k < 0 && errno == EINTR)
8d567588
LP		 2843 continue;
2844
eb22ac37 2845 if (k < 0 && errno == EAGAIN && do_poll) {
8d567588
LP		 2846 struct pollfd pollfd;
2847
2848 zero(pollfd);
2849 pollfd.fd = fd;
2850 pollfd.events = POLLIN;
2851
2852 if (poll(&pollfd, 1, -1) < 0) {
2853 if (errno == EINTR)
2854 continue;
2855
2856 return n > 0 ? n : -errno;
2857 }
2858
2859 if (pollfd.revents != POLLIN)
2860 return n > 0 ? n : -EIO;
2861
2862 continue;
2863 }
2864
2865 return n > 0 ? n : (k < 0 ? -errno : 0);
2866 }
2867
2868 p += k;
2869 nbytes -= k;
2870 n += k;
2871 }
2872
2873 return n;
2874}
2875
eb22ac37
LP		 2876ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) {
2877 const uint8_t *p;
2878 ssize_t n = 0;
2879
2880 assert(fd >= 0);
2881 assert(buf);
2882
2883 p = buf;
2884
2885 while (nbytes > 0) {
2886 ssize_t k;
2887
2888 if ((k = write(fd, p, nbytes)) <= 0) {
2889
2890 if (k < 0 && errno == EINTR)
2891 continue;
2892
2893 if (k < 0 && errno == EAGAIN && do_poll) {
2894 struct pollfd pollfd;
2895
2896 zero(pollfd);
2897 pollfd.fd = fd;
2898 pollfd.events = POLLOUT;
2899
2900 if (poll(&pollfd, 1, -1) < 0) {
2901 if (errno == EINTR)
2902 continue;
2903
2904 return n > 0 ? n : -errno;
2905 }
2906
2907 if (pollfd.revents != POLLOUT)
2908 return n > 0 ? n : -EIO;
2909
2910 continue;
2911 }
2912
2913 return n > 0 ? n : (k < 0 ? -errno : 0);
2914 }
2915
2916 p += k;
2917 nbytes -= k;
2918 n += k;
2919 }
2920
2921 return n;
2922}
2923
0c85a4f3 2924int path_is_mount_point(const char *t, bool allow_symlink) {
8d567588 2925 struct stat a, b;
35d2e7ec
LP		 2926 char *parent;
2927 int r;
8d567588 2928
0c85a4f3
LP		 2929 if (allow_symlink)
2930 r = stat(t, &a);
2931 else
2932 r = lstat(t, &a);
2933
2934 if (r < 0) {
8d567588
LP		 2935 if (errno == ENOENT)
2936 return 0;
2937
2938 return -errno;
2939 }
2940
0c85a4f3
LP		 2941 r = parent_of_path(t, &parent);
2942 if (r < 0)
35d2e7ec 2943 return r;
8d567588 2944
35d2e7ec
LP		 2945 r = lstat(parent, &b);
2946 free(parent);
8d567588 2947
35d2e7ec
LP		 2948 if (r < 0)
2949 return -errno;
8d567588
LP		 2950
2951 return a.st_dev != b.st_dev;
2952}
2953
24a6e4a4
LP		 2954int parse_usec(const char *t, usec_t *usec) {
2955 static const struct {
2956 const char *suffix;
2957 usec_t usec;
2958 } table[] = {
2959 { "sec", USEC_PER_SEC },
2960 { "s", USEC_PER_SEC },
2961 { "min", USEC_PER_MINUTE },
2962 { "hr", USEC_PER_HOUR },
2963 { "h", USEC_PER_HOUR },
2964 { "d", USEC_PER_DAY },
2965 { "w", USEC_PER_WEEK },
2966 { "msec", USEC_PER_MSEC },
2967 { "ms", USEC_PER_MSEC },
2968 { "m", USEC_PER_MINUTE },
2969 { "usec", 1ULL },
2970 { "us", 1ULL },
2971 { "", USEC_PER_SEC },
2972 };
2973
2974 const char *p;
2975 usec_t r = 0;
2976
2977 assert(t);
2978 assert(usec);
2979
2980 p = t;
2981 do {
2982 long long l;
2983 char *e;
2984 unsigned i;
2985
2986 errno = 0;
2987 l = strtoll(p, &e, 10);
2988
2989 if (errno != 0)
2990 return -errno;
2991
2992 if (l < 0)
2993 return -ERANGE;
2994
2995 if (e == p)
2996 return -EINVAL;
2997
2998 e += strspn(e, WHITESPACE);
2999
3000 for (i = 0; i < ELEMENTSOF(table); i++)
3001 if (startswith(e, table[i].suffix)) {
3002 r += (usec_t) l * table[i].usec;
3003 p = e + strlen(table[i].suffix);
3004 break;
3005 }
3006
3007 if (i >= ELEMENTSOF(table))
3008 return -EINVAL;
3009
3010 } while (*p != 0);
3011
3012 *usec = r;
3013
3014 return 0;
3015}
3016
ab1f0633
LP		 3017int parse_bytes(const char *t, off_t *bytes) {
3018 static const struct {
3019 const char *suffix;
3020 off_t factor;
3021 } table[] = {
3022 { "B", 1 },
3023 { "K", 1024ULL },
3024 { "M", 1024ULL*1024ULL },
3025 { "G", 1024ULL*1024ULL*1024ULL },
3026 { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
3027 { "", 1 },
3028 };
3029
3030 const char *p;
3031 off_t r = 0;
3032
3033 assert(t);
3034 assert(bytes);
3035
3036 p = t;
3037 do {
3038 long long l;
3039 char *e;
3040 unsigned i;
3041
3042 errno = 0;
3043 l = strtoll(p, &e, 10);
3044
3045 if (errno != 0)
3046 return -errno;
3047
3048 if (l < 0)
3049 return -ERANGE;
3050
3051 if (e == p)
3052 return -EINVAL;
3053
3054 e += strspn(e, WHITESPACE);
3055
3056 for (i = 0; i < ELEMENTSOF(table); i++)
3057 if (startswith(e, table[i].suffix)) {
3058 r += (off_t) l * table[i].factor;
3059 p = e + strlen(table[i].suffix);
3060 break;
3061 }
3062
3063 if (i >= ELEMENTSOF(table))
3064 return -EINVAL;
3065
3066 } while (*p != 0);
3067
3068 *bytes = r;
3069
3070 return 0;
3071}
3072
843d2643
LP		 3073int make_stdio(int fd) {
3074 int r, s, t;
3075
3076 assert(fd >= 0);
3077
3078 r = dup2(fd, STDIN_FILENO);
3079 s = dup2(fd, STDOUT_FILENO);
3080 t = dup2(fd, STDERR_FILENO);
3081
3082 if (fd >= 3)
3083 close_nointr_nofail(fd);
3084
3085 if (r < 0 || s < 0 || t < 0)
3086 return -errno;
3087
7862f62d
LP		 3088 fd_cloexec(STDIN_FILENO, false);
3089 fd_cloexec(STDOUT_FILENO, false);
3090 fd_cloexec(STDERR_FILENO, false);
3091
843d2643
LP		 3092 return 0;
3093}
3094
ade509ce
LP		 3095int make_null_stdio(void) {
3096 int null_fd;
3097
3098 if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0)
3099 return -errno;
3100
3101 return make_stdio(null_fd);
3102}
3103
8407a5d0
LP		 3104bool is_device_path(const char *path) {
3105
3106 /* Returns true on paths that refer to a device, either in
3107 * sysfs or in /dev */
3108
3109 return
3110 path_startswith(path, "/dev/") ||
3111 path_startswith(path, "/sys/");
3112}
3113
01f78473
LP		 3114int dir_is_empty(const char *path) {
3115 DIR *d;
3116 int r;
3117 struct dirent buf, *de;
3118
3119 if (!(d = opendir(path)))
3120 return -errno;
3121
3122 for (;;) {
3123 if ((r = readdir_r(d, &buf, &de)) > 0) {
3124 r = -r;
3125 break;
3126 }
3127
3128 if (!de) {
3129 r = 1;
3130 break;
3131 }
3132
3133 if (!ignore_file(de->d_name)) {
3134 r = 0;
3135 break;
3136 }
3137 }
3138
3139 closedir(d);
3140 return r;
3141}
3142
d3782d60
LP		 3143unsigned long long random_ull(void) {
3144 int fd;
3145 uint64_t ull;
3146 ssize_t r;
3147
3148 if ((fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY)) < 0)
3149 goto fallback;
3150
eb22ac37 3151 r = loop_read(fd, &ull, sizeof(ull), true);
d3782d60
LP		 3152 close_nointr_nofail(fd);
3153
3154 if (r != sizeof(ull))
3155 goto fallback;
3156
3157 return ull;
3158
3159fallback:
3160 return random() * RAND_MAX + random();
3161}
3162
5b6319dc
LP		 3163void rename_process(const char name[8]) {
3164 assert(name);
3165
3166 prctl(PR_SET_NAME, name);
3167
3168 /* This is a like a poor man's setproctitle(). The string
3169 * passed should fit in 7 chars (i.e. the length of
3170 * "systemd") */
3171
3172 if (program_invocation_name)
3173 strncpy(program_invocation_name, name, strlen(program_invocation_name));
9a0e6896
LP		 3174
3175 if (saved_argc > 0) {
3176 int i;
3177
3178 if (saved_argv[0])
3179 strncpy(saved_argv[0], name, strlen(saved_argv[0]));
3180
3181 for (i = 1; i < saved_argc; i++) {
3182 if (!saved_argv[i])
3183 break;
3184
3185 memset(saved_argv[i], 0, strlen(saved_argv[i]));
3186 }
3187 }
5b6319dc
LP		 3188}
3189
7d793605
LP		 3190void sigset_add_many(sigset_t *ss, ...) {
3191 va_list ap;
3192 int sig;
3193
3194 assert(ss);
3195
3196 va_start(ap, ss);
3197 while ((sig = va_arg(ap, int)) > 0)
3198 assert_se(sigaddset(ss, sig) == 0);
3199 va_end(ap);
3200}
3201
ef2f1067
LP		 3202char* gethostname_malloc(void) {
3203 struct utsname u;
3204
3205 assert_se(uname(&u) >= 0);
3206
3207 if (u.nodename[0])
3208 return strdup(u.nodename);
3209
3210 return strdup(u.sysname);
3211}
3212
3213char* getlogname_malloc(void) {
3214 uid_t uid;
3215 long bufsize;
3216 char *buf, *name;
3217 struct passwd pwbuf, *pw = NULL;
3218 struct stat st;
3219
3220 if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0)
3221 uid = st.st_uid;
3222 else
3223 uid = getuid();
3224
3225 /* Shortcut things to avoid NSS lookups */
3226 if (uid == 0)
3227 return strdup("root");
3228
3229 if ((bufsize = sysconf(_SC_GETPW_R_SIZE_MAX)) <= 0)
3230 bufsize = 4096;
3231
3232 if (!(buf = malloc(bufsize)))
3233 return NULL;
3234
3235 if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw) {
3236 name = strdup(pw->pw_name);
3237 free(buf);
3238 return name;
3239 }
3240
3241 free(buf);
3242
3243 if (asprintf(&name, "%lu", (unsigned long) uid) < 0)
3244 return NULL;
3245
3246 return name;
3247}
3248
fc116c6a
LP		 3249int getttyname_malloc(int fd, char **r) {
3250 char path[PATH_MAX], *c;
618e02c7 3251 int k;
8c6db833
LP		 3252
3253 assert(r);
ef2f1067 3254
fc116c6a 3255 if ((k = ttyname_r(fd, path, sizeof(path))) != 0)
618e02c7 3256 return -k;
ef2f1067
LP		 3257
3258 char_array_0(path);
3259
fc116c6a 3260 if (!(c = strdup(startswith(path, "/dev/") ? path + 5 : path)))
8c6db833
LP		 3261 return -ENOMEM;
3262
3263 *r = c;
3264 return 0;
3265}
3266
fc116c6a
LP		 3267int getttyname_harder(int fd, char **r) {
3268 int k;
3269 char *s;
3270
3271 if ((k = getttyname_malloc(fd, &s)) < 0)
3272 return k;
3273
3274 if (streq(s, "tty")) {
3275 free(s);
4d6d6518 3276 return get_ctty(0, NULL, r);
fc116c6a
LP		 3277 }
3278
3279 *r = s;
3280 return 0;
3281}
3282
4d6d6518 3283int get_ctty_devnr(pid_t pid, dev_t *d) {
fc116c6a 3284 int k;
4d6d6518 3285 char line[LINE_MAX], *p, *fn;
fc116c6a
LP		 3286 unsigned long ttynr;
3287 FILE *f;
3288
4d6d6518
LP		 3289 if (asprintf(&fn, "/proc/%lu/stat", (unsigned long) (pid <= 0 ? getpid() : pid)) < 0)
3290 return -ENOMEM;
3291
3292 f = fopen(fn, "re");
3293 free(fn);
3294 if (!f)
fc116c6a
LP		 3295 return -errno;
3296
4d6d6518 3297 if (!fgets(line, sizeof(line), f)) {
fc116c6a
LP		 3298 k = -errno;
3299 fclose(f);
3300 return k;
3301 }
3302
3303 fclose(f);
3304
4d6d6518
LP		 3305 p = strrchr(line, ')');
3306 if (!p)
fc116c6a
LP		 3307 return -EIO;
3308
3309 p++;
3310
3311 if (sscanf(p, " "
3312 "%*c " /* state */
3313 "%*d " /* ppid */
3314 "%*d " /* pgrp */
3315 "%*d " /* session */
3316 "%lu ", /* ttynr */
3317 &ttynr) != 1)
3318 return -EIO;
3319
3320 *d = (dev_t) ttynr;
3321 return 0;
3322}
3323
4d6d6518 3324int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
fc116c6a 3325 int k;
20c03b7b 3326 char fn[PATH_MAX], *s, *b, *p;
fc116c6a
LP		 3327 dev_t devnr;
3328
3329 assert(r);
3330
4d6d6518
LP		 3331 k = get_ctty_devnr(pid, &devnr);
3332 if (k < 0)
fc116c6a
LP		 3333 return k;
3334
3335 snprintf(fn, sizeof(fn), "/dev/char/%u:%u", major(devnr), minor(devnr));
3336 char_array_0(fn);
3337
3338 if ((k = readlink_malloc(fn, &s)) < 0) {
3339
3340 if (k != -ENOENT)
3341 return k;
3342
46824d0e
LP		 3343 /* This is an ugly hack */
3344 if (major(devnr) == 136) {
3345 if (asprintf(&b, "pts/%lu", (unsigned long) minor(devnr)) < 0)
3346 return -ENOMEM;
3347
3348 *r = b;
3349 if (_devnr)
3350 *_devnr = devnr;
3351
3352 return 0;
3353 }
3354
fc116c6a
LP		 3355 /* Probably something like the ptys which have no
3356 * symlink in /dev/char. Let's return something
3357 * vaguely useful. */
3358
3359 if (!(b = strdup(fn + 5)))
3360 return -ENOMEM;
3361
3362 *r = b;
46824d0e
LP		 3363 if (_devnr)
3364 *_devnr = devnr;
3365
fc116c6a
LP		 3366 return 0;
3367 }
3368
3369 if (startswith(s, "/dev/"))
3370 p = s + 5;
3371 else if (startswith(s, "../"))
3372 p = s + 3;
3373 else
3374 p = s;
3375
3376 b = strdup(p);
3377 free(s);
3378
3379 if (!b)
3380 return -ENOMEM;
3381
3382 *r = b;
46824d0e
LP		 3383 if (_devnr)
3384 *_devnr = devnr;
3385
fc116c6a
LP		 3386 return 0;
3387}
3388
ad293f5a 3389static int rm_rf_children(int fd, bool only_dirs, bool honour_sticky) {
8c6db833
LP		 3390 DIR *d;
3391 int ret = 0;
3392
3393 assert(fd >= 0);
3394
3395 /* This returns the first error we run into, but nevertheless
3396 * tries to go on */
3397
3398 if (!(d = fdopendir(fd))) {
3399 close_nointr_nofail(fd);
4c633005
LP		 3400
3401 return errno == ENOENT ? 0 : -errno;
8c6db833
LP		 3402 }
3403
3404 for (;;) {
3405 struct dirent buf, *de;
ad293f5a 3406 bool is_dir, keep_around = false;
8c6db833
LP		 3407 int r;
3408
3409 if ((r = readdir_r(d, &buf, &de)) != 0) {
3410 if (ret == 0)
3411 ret = -r;
3412 break;
3413 }
3414
3415 if (!de)
3416 break;
3417
3418 if (streq(de->d_name, ".") || streq(de->d_name, ".."))
3419 continue;
3420
3421 if (de->d_type == DT_UNKNOWN) {
3422 struct stat st;
3423
3424 if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
4c633005 3425 if (ret == 0 && errno != ENOENT)
8c6db833
LP		 3426 ret = -errno;
3427 continue;
3428 }
3429
ad293f5a
LP		 3430 if (honour_sticky)
3431 keep_around = st.st_uid == 0 && (st.st_mode & S_ISVTX);
3432
8c6db833 3433 is_dir = S_ISDIR(st.st_mode);
ad293f5a
LP		 3434
3435 } else {
3436 if (honour_sticky) {
3437 struct stat st;
3438
3439 if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
3440 if (ret == 0 && errno != ENOENT)
3441 ret = -errno;
3442 continue;
3443 }
3444
3445 keep_around = st.st_uid == 0 && (st.st_mode & S_ISVTX);
3446 }
3447
8c6db833 3448 is_dir = de->d_type == DT_DIR;
ad293f5a 3449 }
8c6db833
LP		 3450
3451 if (is_dir) {
3452 int subdir_fd;
3453
3454 if ((subdir_fd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)) < 0) {
4c633005 3455 if (ret == 0 && errno != ENOENT)
8c6db833
LP		 3456 ret = -errno;
3457 continue;
3458 }
3459
ad293f5a 3460 if ((r = rm_rf_children(subdir_fd, only_dirs, honour_sticky)) < 0) {
8c6db833
LP		 3461 if (ret == 0)
3462 ret = r;
3463 }
3464
ad293f5a
LP		 3465 if (!keep_around)
3466 if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
3467 if (ret == 0 && errno != ENOENT)
3468 ret = -errno;
3469 }
3470
3471 } else if (!only_dirs && !keep_around) {
8c6db833
LP		 3472
3473 if (unlinkat(fd, de->d_name, 0) < 0) {
4c633005 3474 if (ret == 0 && errno != ENOENT)
8c6db833
LP		 3475 ret = -errno;
3476 }
3477 }
3478 }
3479
3480 closedir(d);
3481
3482 return ret;
3483}
3484
ad293f5a 3485int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
8c6db833
LP		 3486 int fd;
3487 int r;
3488
3489 assert(path);
3490
3491 if ((fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)) < 0) {
3492
3493 if (errno != ENOTDIR)
3494 return -errno;
3495
3496 if (delete_root && !only_dirs)
3497 if (unlink(path) < 0)
3498 return -errno;
3499
3500 return 0;
3501 }
3502
ad293f5a
LP		 3503 r = rm_rf_children(fd, only_dirs, honour_sticky);
3504
3505 if (delete_root) {
3506
3507 if (honour_sticky && file_is_sticky(path) > 0)
3508 return r;
8c6db833 3509
e27796a0 3510 if (rmdir(path) < 0 && errno != ENOENT) {
8c6db833
LP		 3511 if (r == 0)
3512 r = -errno;
3513 }
ad293f5a 3514 }
8c6db833
LP		 3515
3516 return r;
3517}
3518
3519int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
3520 assert(path);
3521
3522 /* Under the assumption that we are running privileged we
3523 * first change the access mode and only then hand out
3524 * ownership to avoid a window where access is too open. */
3525
3526 if (chmod(path, mode) < 0)
3527 return -errno;
3528
3529 if (chown(path, uid, gid) < 0)
3530 return -errno;
3531
3532 return 0;
ef2f1067
LP		 3533}
3534
f4b47811
LP		 3535int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid) {
3536 assert(fd >= 0);
3537
3538 /* Under the assumption that we are running privileged we
3539 * first change the access mode and only then hand out
3540 * ownership to avoid a window where access is too open. */
3541
3542 if (fchmod(fd, mode) < 0)
3543 return -errno;
3544
3545 if (fchown(fd, uid, gid) < 0)
3546 return -errno;
3547
3548 return 0;
3549}
3550
82c121a4
LP		 3551cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
3552 cpu_set_t *r;
3553 unsigned n = 1024;
3554
3555 /* Allocates the cpuset in the right size */
3556
3557 for (;;) {
3558 if (!(r = CPU_ALLOC(n)))
3559 return NULL;
3560
3561 if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), r) >= 0) {
3562 CPU_ZERO_S(CPU_ALLOC_SIZE(n), r);
3563
3564 if (ncpus)
3565 *ncpus = n;
3566
3567 return r;
3568 }
3569
3570 CPU_FREE(r);
3571
3572 if (errno != EINVAL)
3573 return NULL;
3574
3575 n *= 2;
3576 }
3577}
3578
9e58ff9c
LP		 3579void status_vprintf(const char *format, va_list ap) {
3580 char *s = NULL;
3581 int fd = -1;
3582
3583 assert(format);
3584
3585 /* This independent of logging, as status messages are
3586 * optional and go exclusively to the console. */
3587
3588 if (vasprintf(&s, format, ap) < 0)
3589 goto finish;
3590
3591 if ((fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0)
3592 goto finish;
3593
3594 write(fd, s, strlen(s));
3595
3596finish:
3597 free(s);
3598
3599 if (fd >= 0)
3600 close_nointr_nofail(fd);
3601}
3602
c846ff47
LP		 3603void status_printf(const char *format, ...) {
3604 va_list ap;
3605
3606 assert(format);
3607
3608 va_start(ap, format);
3609 status_vprintf(format, ap);
3610 va_end(ap);
3611}
3612
3613void status_welcome(void) {
10aa7034
LP		 3614 char *pretty_name = NULL, *ansi_color = NULL;
3615 const char *const_pretty = NULL, *const_color = NULL;
3616 int r;
c846ff47 3617
10aa7034
LP		 3618 if ((r = parse_env_file("/etc/os-release", NEWLINE,
3619 "PRETTY_NAME", &pretty_name,
3620 "ANSI_COLOR", &ansi_color,
3621 NULL)) < 0) {
c846ff47 3622
10aa7034
LP		 3623 if (r != -ENOENT)
3624 log_warning("Failed to read /etc/os-release: %s", strerror(-r));
3625 }
c846ff47 3626
10aa7034
LP		 3627#if defined(TARGET_FEDORA)
3628 if (!pretty_name) {
3629 if ((r = read_one_line_file("/etc/system-release", &pretty_name)) < 0) {
c846ff47 3630
10aa7034
LP		 3631 if (r != -ENOENT)
3632 log_warning("Failed to read /etc/system-release: %s", strerror(-r));
6f9a471a 3633 }
10aa7034 3634 }
c846ff47 3635
10aa7034 3636 if (!ansi_color && pretty_name) {
c846ff47 3637
10aa7034
LP		 3638 /* This tries to mimic the color magic the old Red Hat sysinit
3639 * script did. */
3640
3641 if (startswith(pretty_name, "Red Hat"))
3642 const_color = "0;31"; /* Red for RHEL */
3643 else if (startswith(pretty_name, "Fedora"))
3644 const_color = "0;34"; /* Blue for Fedora */
3645 }
c846ff47
LP		 3646
3647#elif defined(TARGET_SUSE)
c846ff47 3648
10aa7034
LP		 3649 if (!pretty_name) {
3650 if ((r = read_one_line_file("/etc/SuSE-release", &pretty_name)) < 0) {
c846ff47 3651
10aa7034
LP		 3652 if (r != -ENOENT)
3653 log_warning("Failed to read /etc/SuSE-release: %s", strerror(-r));
6f9a471a 3654 }
10aa7034 3655 }
c846ff47 3656
10aa7034
LP		 3657 if (!ansi_color)
3658 const_color = "0;32"; /* Green for openSUSE */
5a6225fd 3659
0d37b36b 3660#elif defined(TARGET_GENTOO)
0d37b36b 3661
10aa7034
LP		 3662 if (!pretty_name) {
3663 if ((r = read_one_line_file("/etc/gentoo-release", &pretty_name)) < 0) {
0d37b36b 3664
10aa7034
LP		 3665 if (r != -ENOENT)
3666 log_warning("Failed to read /etc/gentoo-release: %s", strerror(-r));
6f9a471a 3667 }
10aa7034 3668 }
0d37b36b 3669
10aa7034
LP		 3670 if (!ansi_color)
3671 const_color = "1;34"; /* Light Blue for Gentoo */
5a6225fd 3672
a338bab5
AS		 3673#elif defined(TARGET_ALTLINUX)
3674
3675 if (!pretty_name) {
3676 if ((r = read_one_line_file("/etc/altlinux-release", &pretty_name)) < 0) {
3677
3678 if (r != -ENOENT)
3679 log_warning("Failed to read /etc/altlinux-release: %s", strerror(-r));
6f9a471a 3680 }
a338bab5
AS		 3681 }
3682
3683 if (!ansi_color)
3684 const_color = "0;36"; /* Cyan for ALTLinux */
3685
3686
5a6225fd 3687#elif defined(TARGET_DEBIAN)
5a6225fd 3688
10aa7034 3689 if (!pretty_name) {
22927a36 3690 char *version;
c8bffa43 3691
22927a36 3692 if ((r = read_one_line_file("/etc/debian_version", &version)) < 0) {
5a6225fd 3693
10aa7034
LP		 3694 if (r != -ENOENT)
3695 log_warning("Failed to read /etc/debian_version: %s", strerror(-r));
22927a36 3696 } else {
22927a36
MB		 3697 pretty_name = strappend("Debian ", version);
3698 free(version);
c8bffa43
LP		 3699
3700 if (!pretty_name)
3701 log_warning("Failed to allocate Debian version string.");
22927a36 3702 }
10aa7034 3703 }
5a6225fd 3704
10aa7034
LP		 3705 if (!ansi_color)
3706 const_color = "1;31"; /* Light Red for Debian */
5a6225fd 3707
274914f9 3708#elif defined(TARGET_UBUNTU)
10aa7034
LP		 3709
3710 if ((r = parse_env_file("/etc/lsb-release", NEWLINE,
3711 "DISTRIB_DESCRIPTION", &pretty_name,
3712 NULL)) < 0) {
3713
3714 if (r != -ENOENT)
3715 log_warning("Failed to read /etc/lsb-release: %s", strerror(-r));
3716 }
3717
3718 if (!ansi_color)
3719 const_color = "0;33"; /* Orange/Brown for Ubuntu */
3720
1de4d79b
AB		 3721#elif defined(TARGET_MANDRIVA)
3722
3723 if (!pretty_name) {
3724 char *s, *p;
3725
3726 if ((r = read_one_line_file("/etc/mandriva-release", &s) < 0)) {
3727 if (r != -ENOENT)
3728 log_warning("Failed to read /etc/mandriva-release: %s", strerror(-r));
3729 } else {
3730 p = strstr(s, " release ");
3731 if (p) {
3732 *p = '\0';
3733 p += 9;
3734 p[strcspn(p, " ")] = '\0';
3735
3736 /* This corresponds to standard rc.sysinit */
3737 if (asprintf(&pretty_name, "%s\x1B[0;39m %s", s, p) > 0)
3738 const_color = "1;36";
3739 else
3740 log_warning("Failed to allocate Mandriva version string.");
3741 } else
3742 log_warning("Failed to parse /etc/mandriva-release");
3743 free(s);
3744 }
3745 }
54e4fdef 3746#elif defined(TARGET_MEEGO)
1de4d79b 3747
54e4fdef
CF		 3748 if (!pretty_name) {
3749 if ((r = read_one_line_file("/etc/meego-release", &pretty_name)) < 0) {
3750
3751 if (r != -ENOENT)
3752 log_warning("Failed to read /etc/meego-release: %s", strerror(-r));
3753 }
3754 }
3755
3756 if (!ansi_color)
3757 const_color = "1;35"; /* Bright Magenta for MeeGo */
c846ff47 3758#endif
10aa7034
LP		 3759
3760 if (!pretty_name && !const_pretty)
3761 const_pretty = "Linux";
3762
3763 if (!ansi_color && !const_color)
3764 const_color = "1";
3765
da71f23c 3766 status_printf("\nWelcome to \x1B[%sm%s\x1B[0m!\n\n",
10aa7034
LP		 3767 const_color ? const_color : ansi_color,
3768 const_pretty ? const_pretty : pretty_name);
86a3475b
LP		 3769
3770 free(ansi_color);
3771 free(pretty_name);
c846ff47
LP		 3772}
3773
fab56fc5
LP		 3774char *replace_env(const char *format, char **env) {
3775 enum {
3776 WORD,
c24eb49e 3777 CURLY,
fab56fc5
LP		 3778 VARIABLE
3779 } state = WORD;
3780
3781 const char *e, *word = format;
3782 char *r = NULL, *k;
3783
3784 assert(format);
3785
3786 for (e = format; *e; e ++) {
3787
3788 switch (state) {
3789
3790 case WORD:
3791 if (*e == '$')
c24eb49e 3792 state = CURLY;
fab56fc5
LP		 3793 break;
3794
c24eb49e
LP		 3795 case CURLY:
3796 if (*e == '{') {
fab56fc5
LP		 3797 if (!(k = strnappend(r, word, e-word-1)))
3798 goto fail;
3799
3800 free(r);
3801 r = k;
3802
3803 word = e-1;
3804 state = VARIABLE;
3805
3806 } else if (*e == '$') {
3807 if (!(k = strnappend(r, word, e-word)))
3808 goto fail;
3809
3810 free(r);
3811 r = k;
3812
3813 word = e+1;
3814 state = WORD;
3815 } else
3816 state = WORD;
3817 break;
3818
3819 case VARIABLE:
c24eb49e 3820 if (*e == '}') {
b95cf362 3821 const char *t;
fab56fc5 3822
b95cf362
LP		 3823 if (!(t = strv_env_get_with_length(env, word+2, e-word-2)))
3824 t = "";
fab56fc5 3825
b95cf362
LP		 3826 if (!(k = strappend(r, t)))
3827 goto fail;
fab56fc5 3828
b95cf362
LP		 3829 free(r);
3830 r = k;
fab56fc5 3831
b95cf362 3832 word = e+1;
fab56fc5
LP		 3833 state = WORD;
3834 }
3835 break;
3836 }
3837 }
3838
3839 if (!(k = strnappend(r, word, e-word)))
3840 goto fail;
3841
3842 free(r);
3843 return k;
3844
3845fail:
3846 free(r);
3847 return NULL;
3848}
3849
3850char **replace_env_argv(char **argv, char **env) {
3851 char **r, **i;
c24eb49e
LP		 3852 unsigned k = 0, l = 0;
3853
3854 l = strv_length(argv);
fab56fc5 3855
c24eb49e 3856 if (!(r = new(char*, l+1)))
fab56fc5
LP		 3857 return NULL;
3858
3859 STRV_FOREACH(i, argv) {
c24eb49e
LP		 3860
3861 /* If $FOO appears as single word, replace it by the split up variable */
b95cf362
LP		 3862 if ((*i)[0] == '$' && (*i)[1] != '{') {
3863 char *e;
3864 char **w, **m;
3865 unsigned q;
c24eb49e 3866
b95cf362 3867 if ((e = strv_env_get(env, *i+1))) {
c24eb49e
LP		 3868
3869 if (!(m = strv_split_quoted(e))) {
3870 r[k] = NULL;
3871 strv_free(r);
3872 return NULL;
3873 }
b95cf362
LP		 3874 } else
3875 m = NULL;
c24eb49e 3876
b95cf362
LP		 3877 q = strv_length(m);
3878 l = l + q - 1;
c24eb49e 3879
b95cf362
LP		 3880 if (!(w = realloc(r, sizeof(char*) * (l+1)))) {
3881 r[k] = NULL;
3882 strv_free(r);
3883 strv_free(m);
3884 return NULL;
3885 }
c24eb49e 3886
b95cf362
LP		 3887 r = w;
3888 if (m) {
c24eb49e
LP		 3889 memcpy(r + k, m, q * sizeof(char*));
3890 free(m);
c24eb49e 3891 }
b95cf362
LP		 3892
3893 k += q;
3894 continue;
c24eb49e
LP		 3895 }
3896
3897 /* If ${FOO} appears as part of a word, replace it by the variable as-is */
fab56fc5
LP		 3898 if (!(r[k++] = replace_env(*i, env))) {
3899 strv_free(r);
3900 return NULL;
3901 }
3902 }
3903
3904 r[k] = NULL;
3905 return r;
3906}
3907
fa776d8e
LP		 3908int columns(void) {
3909 static __thread int parsed_columns = 0;
3910 const char *e;
3911
3bfc7184 3912 if (_likely_(parsed_columns > 0))
fa776d8e
LP		 3913 return parsed_columns;
3914
3915 if ((e = getenv("COLUMNS")))
3916 parsed_columns = atoi(e);
3917
3918 if (parsed_columns <= 0) {
3919 struct winsize ws;
3920 zero(ws);
3921
9ed95f43 3922 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) >= 0)
fa776d8e
LP		 3923 parsed_columns = ws.ws_col;
3924 }
3925
3926 if (parsed_columns <= 0)
3927 parsed_columns = 80;
3928
3929 return parsed_columns;
3930}
3931
b4f10a5e
LP		 3932int running_in_chroot(void) {
3933 struct stat a, b;
3934
3935 zero(a);
3936 zero(b);
3937
3938 /* Only works as root */
3939
3940 if (stat("/proc/1/root", &a) < 0)
3941 return -errno;
3942
3943 if (stat("/", &b) < 0)
3944 return -errno;
3945
3946 return
3947 a.st_dev != b.st_dev ||
3948 a.st_ino != b.st_ino;
3949}
3950
8fe914ec
LP		 3951char *ellipsize(const char *s, unsigned length, unsigned percent) {
3952 size_t l, x;
3953 char *r;
3954
3955 assert(s);
3956 assert(percent <= 100);
3957 assert(length >= 3);
3958
3959 l = strlen(s);
3960
3961 if (l <= 3 || l <= length)
3962 return strdup(s);
3963
3964 if (!(r = new0(char, length+1)))
3965 return r;
3966
3967 x = (length * percent) / 100;
3968
3969 if (x > length - 3)
3970 x = length - 3;
3971
3972 memcpy(r, s, x);
3973 r[x] = '.';
3974 r[x+1] = '.';
3975 r[x+2] = '.';
3976 memcpy(r + x + 3,
3977 s + l - (length - x - 3),
3978 length - x - 3);
3979
3980 return r;
3981}
3982
f6144808
LP		 3983int touch(const char *path) {
3984 int fd;
3985
3986 assert(path);
3987
14f3c825 3988 if ((fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644)) < 0)
f6144808
LP		 3989 return -errno;
3990
3991 close_nointr_nofail(fd);
3992 return 0;
3993}
afea26ad 3994
97c4a07d 3995char *unquote(const char *s, const char* quotes) {
11ce3427
LP		 3996 size_t l;
3997 assert(s);
3998
3999 if ((l = strlen(s)) < 2)
4000 return strdup(s);
4001
97c4a07d 4002 if (strchr(quotes, s[0]) && s[l-1] == s[0])
11ce3427
LP		 4003 return strndup(s+1, l-2);
4004
4005 return strdup(s);
4006}
4007
5f7c426e
LP		 4008char *normalize_env_assignment(const char *s) {
4009 char *name, *value, *p, *r;
4010
4011 p = strchr(s, '=');
4012
4013 if (!p) {
4014 if (!(r = strdup(s)))
4015 return NULL;
4016
4017 return strstrip(r);
4018 }
4019
4020 if (!(name = strndup(s, p - s)))
4021 return NULL;
4022
4023 if (!(p = strdup(p+1))) {
4024 free(name);
4025 return NULL;
4026 }
4027
4028 value = unquote(strstrip(p), QUOTES);
4029 free(p);
4030
4031 if (!value) {
5f7c426e
LP		 4032 free(name);
4033 return NULL;
4034 }
4035
4036 if (asprintf(&r, "%s=%s", name, value) < 0)
4037 r = NULL;
4038
4039 free(value);
4040 free(name);
4041
4042 return r;
4043}
4044
8e12a6ae 4045int wait_for_terminate(pid_t pid, siginfo_t *status) {
1968a360
LP		 4046 siginfo_t dummy;
4047
2e78aa99 4048 assert(pid >= 1);
1968a360
LP		 4049
4050 if (!status)
4051 status = &dummy;
2e78aa99
LP		 4052
4053 for (;;) {
8e12a6ae
LP		 4054 zero(*status);
4055
4056 if (waitid(P_PID, pid, status, WEXITED) < 0) {
2e78aa99
LP		 4057
4058 if (errno == EINTR)
4059 continue;
4060
4061 return -errno;
4062 }
4063
4064 return 0;
4065 }
4066}
4067
97c4a07d
LP		 4068int wait_for_terminate_and_warn(const char *name, pid_t pid) {
4069 int r;
4070 siginfo_t status;
4071
4072 assert(name);
4073 assert(pid > 1);
4074
4075 if ((r = wait_for_terminate(pid, &status)) < 0) {
4076 log_warning("Failed to wait for %s: %s", name, strerror(-r));
4077 return r;
4078 }
4079
4080 if (status.si_code == CLD_EXITED) {
4081 if (status.si_status != 0) {
4082 log_warning("%s failed with error code %i.", name, status.si_status);
0a27cf3f 4083 return status.si_status;
97c4a07d
LP		 4084 }
4085
4086 log_debug("%s succeeded.", name);
4087 return 0;
4088
4089 } else if (status.si_code == CLD_KILLED ||
4090 status.si_code == CLD_DUMPED) {
4091
4092 log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
4093 return -EPROTO;
4094 }
4095
4096 log_warning("%s failed due to unknown reason.", name);
4097 return -EPROTO;
4098
4099}
4100
3c14d26c 4101void freeze(void) {
720ce21d
LP		 4102
4103 /* Make sure nobody waits for us on a socket anymore */
4104 close_all_fds(NULL, 0);
4105
c29597a1
LP		 4106 sync();
4107
3c14d26c
LP		 4108 for (;;)
4109 pause();
4110}
4111
00dc5d76
LP		 4112bool null_or_empty(struct stat *st) {
4113 assert(st);
4114
4115 if (S_ISREG(st->st_mode) && st->st_size <= 0)
4116 return true;
4117
c8f26f42 4118 if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode))
00dc5d76
LP		 4119 return true;
4120
4121 return false;
4122}
4123
83096483
LP		 4124int null_or_empty_path(const char *fn) {
4125 struct stat st;
4126
4127 assert(fn);
4128
4129 if (stat(fn, &st) < 0)
4130 return -errno;
4131
4132 return null_or_empty(&st);
4133}
4134
a247755d 4135DIR *xopendirat(int fd, const char *name, int flags) {
c4731d11
LP		 4136 int nfd;
4137 DIR *d;
4138
4139 if ((nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags)) < 0)
4140 return NULL;
4141
4142 if (!(d = fdopendir(nfd))) {
4143 close_nointr_nofail(nfd);
4144 return NULL;
4145 }
4146
4147 return d;
3b63d2d3
LP		 4148}
4149
8a0867d6
LP		 4150int signal_from_string_try_harder(const char *s) {
4151 int signo;
4152 assert(s);
4153
4154 if ((signo = signal_from_string(s)) <= 0)
4155 if (startswith(s, "SIG"))
4156 return signal_from_string(s+3);
4157
4158 return signo;
4159}
4160
10717a1a
LP		 4161void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) {
4162
4163 assert(f);
4164 assert(name);
4165 assert(t);
4166
4167 if (!dual_timestamp_is_set(t))
4168 return;
4169
4170 fprintf(f, "%s=%llu %llu\n",
4171 name,
4172 (unsigned long long) t->realtime,
4173 (unsigned long long) t->monotonic);
4174}
4175
799fd0fd 4176void dual_timestamp_deserialize(const char *value, dual_timestamp *t) {
10717a1a
LP		 4177 unsigned long long a, b;
4178
10717a1a
LP		 4179 assert(value);
4180 assert(t);
4181
4182 if (sscanf(value, "%lli %llu", &a, &b) != 2)
4183 log_debug("Failed to parse finish timestamp value %s", value);
4184 else {
4185 t->realtime = a;
4186 t->monotonic = b;
4187 }
4188}
4189
e23a0ce8
LP		 4190char *fstab_node_to_udev_node(const char *p) {
4191 char *dn, *t, *u;
4192 int r;
4193
4194 /* FIXME: to follow udev's logic 100% we need to leave valid
4195 * UTF8 chars unescaped */
4196
4197 if (startswith(p, "LABEL=")) {
4198
4199 if (!(u = unquote(p+6, "\"\'")))
4200 return NULL;
4201
4202 t = xescape(u, "/ ");
4203 free(u);
4204
4205 if (!t)
4206 return NULL;
4207
4208 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
4209 free(t);
4210
4211 if (r < 0)
4212 return NULL;
4213
4214 return dn;
4215 }
4216
4217 if (startswith(p, "UUID=")) {
4218
4219 if (!(u = unquote(p+5, "\"\'")))
4220 return NULL;
4221
4222 t = xescape(u, "/ ");
4223 free(u);
4224
4225 if (!t)
4226 return NULL;
4227
0058d7b9 4228 r = asprintf(&dn, "/dev/disk/by-uuid/%s", t);
e23a0ce8
LP		 4229 free(t);
4230
4231 if (r < 0)
4232 return NULL;
4233
4234 return dn;
4235 }
4236
4237 return strdup(p);
4238}
4239
e9ddabc2
LP		 4240void filter_environ(const char *prefix) {
4241 int i, j;
4242 assert(prefix);
4243
4244 if (!environ)
4245 return;
4246
4247 for (i = 0, j = 0; environ[i]; i++) {
4248
4249 if (startswith(environ[i], prefix))
4250 continue;
4251
4252 environ[j++] = environ[i];
4253 }
4254
4255 environ[j] = NULL;
4256}
4257
f212ac12
LP		 4258bool tty_is_vc(const char *tty) {
4259 assert(tty);
4260
4261 if (startswith(tty, "/dev/"))
4262 tty += 5;
4263
98a28fef
LP		 4264 return vtnr_from_tty(tty) >= 0;
4265}
4266
4267int vtnr_from_tty(const char *tty) {
4268 int i, r;
4269
4270 assert(tty);
4271
4272 if (startswith(tty, "/dev/"))
4273 tty += 5;
4274
4275 if (!startswith(tty, "tty") )
4276 return -EINVAL;
4277
4278 if (tty[3] < '0' || tty[3] > '9')
4279 return -EINVAL;
4280
4281 r = safe_atoi(tty+3, &i);
4282 if (r < 0)
4283 return r;
4284
4285 if (i < 0 || i > 63)
4286 return -EINVAL;
4287
4288 return i;
f212ac12
LP		 4289}
4290
e3aa71c3 4291const char *default_term_for_tty(const char *tty) {
3030ccd7
LP		 4292 char *active = NULL;
4293 const char *term;
4294
e3aa71c3
LP		 4295 assert(tty);
4296
4297 if (startswith(tty, "/dev/"))
4298 tty += 5;
4299
3030ccd7
LP		 4300 /* Resolve where /dev/console is pointing when determining
4301 * TERM */
4302 if (streq(tty, "console"))
4303 if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
079a09fb
LP		 4304 /* If multiple log outputs are configured the
4305 * last one is what /dev/console points to */
4306 if ((tty = strrchr(active, ' ')))
4307 tty++;
4308 else
4309 tty = active;
3030ccd7
LP		 4310 }
4311
f212ac12 4312 term = tty_is_vc(tty) ? "TERM=linux" : "TERM=vt100";
3030ccd7 4313 free(active);
e3aa71c3 4314
3030ccd7 4315 return term;
e3aa71c3
LP		 4316}
4317
87d2c1ff 4318bool dirent_is_file(const struct dirent *de) {
fb19a739
LP		 4319 assert(de);
4320
4321 if (ignore_file(de->d_name))
4322 return false;
4323
4324 if (de->d_type != DT_REG &&
4325 de->d_type != DT_LNK &&
4326 de->d_type != DT_UNKNOWN)
4327 return false;
4328
4329 return true;
4330}
4331
87d2c1ff
LP		 4332bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) {
4333 assert(de);
4334
4335 if (!dirent_is_file(de))
4336 return false;
4337
4338 return endswith(de->d_name, suffix);
4339}
4340
83cc030f
LP		 4341void execute_directory(const char *directory, DIR *d, char *argv[]) {
4342 DIR *_d = NULL;
4343 struct dirent *de;
4344 Hashmap *pids = NULL;
4345
4346 assert(directory);
4347
4348 /* Executes all binaries in a directory in parallel and waits
4349 * until all they all finished. */
4350
4351 if (!d) {
4352 if (!(_d = opendir(directory))) {
4353
4354 if (errno == ENOENT)
4355 return;
4356
4357 log_error("Failed to enumerate directory %s: %m", directory);
4358 return;
4359 }
4360
4361 d = _d;
4362 }
4363
4364 if (!(pids = hashmap_new(trivial_hash_func, trivial_compare_func))) {
4365 log_error("Failed to allocate set.");
4366 goto finish;
4367 }
4368
4369 while ((de = readdir(d))) {
4370 char *path;
4371 pid_t pid;
4372 int k;
4373
fb19a739 4374 if (!dirent_is_file(de))
83cc030f
LP		 4375 continue;
4376
4377 if (asprintf(&path, "%s/%s", directory, de->d_name) < 0) {
4378 log_error("Out of memory");
4379 continue;
4380 }
4381
4382 if ((pid = fork()) < 0) {
4383 log_error("Failed to fork: %m");
4384 free(path);
4385 continue;
4386 }
4387
4388 if (pid == 0) {
4389 char *_argv[2];
4390 /* Child */
4391
4392 if (!argv) {
4393 _argv[0] = path;
4394 _argv[1] = NULL;
4395 argv = _argv;
4396 } else
4397 if (!argv[0])
4398 argv[0] = path;
4399
4400 execv(path, argv);
4401
4402 log_error("Failed to execute %s: %m", path);
4403 _exit(EXIT_FAILURE);
4404 }
4405
4406 log_debug("Spawned %s as %lu", path, (unsigned long) pid);
4407
4408 if ((k = hashmap_put(pids, UINT_TO_PTR(pid), path)) < 0) {
4409 log_error("Failed to add PID to set: %s", strerror(-k));
4410 free(path);
4411 }
4412 }
4413
4414 while (!hashmap_isempty(pids)) {
4415 siginfo_t si;
4416 char *path;
4417
4418 zero(si);
4419 if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
4420
4421 if (errno == EINTR)
4422 continue;
4423
4424 log_error("waitid() failed: %m");
4425 goto finish;
4426 }
4427
4428 if ((path = hashmap_remove(pids, UINT_TO_PTR(si.si_pid)))) {
4429 if (!is_clean_exit(si.si_code, si.si_status)) {
4430 if (si.si_code == CLD_EXITED)
4431 log_error("%s exited with exit status %i.", path, si.si_status);
4432 else
4433 log_error("%s terminated by signal %s.", path, signal_to_string(si.si_status));
4434 } else
4435 log_debug("%s exited successfully.", path);
4436
4437 free(path);
4438 }
4439 }
4440
4441finish:
4442 if (_d)
4443 closedir(_d);
4444
4445 if (pids)
4446 hashmap_free_free(pids);
4447}
4448
430c18ed
LP		 4449int kill_and_sigcont(pid_t pid, int sig) {
4450 int r;
4451
4452 r = kill(pid, sig) < 0 ? -errno : 0;
4453
4454 if (r >= 0)
4455 kill(pid, SIGCONT);
4456
4457 return r;
4458}
4459
05feefe0
LP		 4460bool nulstr_contains(const char*nulstr, const char *needle) {
4461 const char *i;
4462
4463 if (!nulstr)
4464 return false;
4465
4466 NULSTR_FOREACH(i, nulstr)
4467 if (streq(i, needle))
4468 return true;
4469
4470 return false;
4471}
4472
6faa1114 4473bool plymouth_running(void) {
9408a2d2 4474 return access("/run/plymouth/pid", F_OK) >= 0;
6faa1114
LP		 4475}
4476
7c3b203c
LP		 4477void parse_syslog_priority(char **p, int *priority) {
4478 int a = 0, b = 0, c = 0;
4479 int k;
4480
4481 assert(p);
4482 assert(*p);
4483 assert(priority);
4484
4485 if ((*p)[0] != '<')
4486 return;
4487
4488 if (!strchr(*p, '>'))
4489 return;
4490
4491 if ((*p)[2] == '>') {
4492 c = undecchar((*p)[1]);
4493 k = 3;
4494 } else if ((*p)[3] == '>') {
4495 b = undecchar((*p)[1]);
4496 c = undecchar((*p)[2]);
4497 k = 4;
4498 } else if ((*p)[4] == '>') {
4499 a = undecchar((*p)[1]);
4500 b = undecchar((*p)[2]);
4501 c = undecchar((*p)[3]);
4502 k = 5;
4503 } else
4504 return;
4505
4506 if (a < 0 || b < 0 || c < 0)
4507 return;
4508
4509 *priority = a*100+b*10+c;
4510 *p += k;
4511}
4512
87d2c1ff
LP		 4513void skip_syslog_pid(char **buf) {
4514 char *p;
4515
4516 assert(buf);
4517 assert(*buf);
4518
4519 p = *buf;
4520
4521 if (*p != '[')
4522 return;
4523
4524 p++;
4525 p += strspn(p, "0123456789");
4526
4527 if (*p != ']')
4528 return;
4529
4530 p++;
4531
4532 *buf = p;
4533}
4534
4535void skip_syslog_date(char **buf) {
4536 enum {
4537 LETTER,
4538 SPACE,
4539 NUMBER,
4540 SPACE_OR_NUMBER,
4541 COLON
4542 } sequence[] = {
4543 LETTER, LETTER, LETTER,
4544 SPACE,
4545 SPACE_OR_NUMBER, NUMBER,
4546 SPACE,
4547 SPACE_OR_NUMBER, NUMBER,
4548 COLON,
4549 SPACE_OR_NUMBER, NUMBER,
4550 COLON,
4551 SPACE_OR_NUMBER, NUMBER,
4552 SPACE
4553 };
4554
4555 char *p;
4556 unsigned i;
4557
4558 assert(buf);
4559 assert(*buf);
4560
4561 p = *buf;
4562
4563 for (i = 0; i < ELEMENTSOF(sequence); i++, p++) {
4564
4565 if (!*p)
4566 return;
4567
4568 switch (sequence[i]) {
4569
4570 case SPACE:
4571 if (*p != ' ')
4572 return;
4573 break;
4574
4575 case SPACE_OR_NUMBER:
4576 if (*p == ' ')
4577 break;
4578
4579 /* fall through */
4580
4581 case NUMBER:
4582 if (*p < '0' || *p > '9')
4583 return;
4584
4585 break;
4586
4587 case LETTER:
4588 if (!(*p >= 'A' && *p <= 'Z') &&
4589 !(*p >= 'a' && *p <= 'z'))
4590 return;
4591
4592 break;
4593
4594 case COLON:
4595 if (*p != ':')
4596 return;
4597 break;
4598
4599 }
4600 }
4601
4602 *buf = p;
4603}
4604
ac123445
LP		 4605int have_effective_cap(int value) {
4606 cap_t cap;
4607 cap_flag_value_t fv;
4608 int r;
4609
4610 if (!(cap = cap_get_proc()))
4611 return -errno;
4612
4613 if (cap_get_flag(cap, value, CAP_EFFECTIVE, &fv) < 0)
4614 r = -errno;
4615 else
4616 r = fv == CAP_SET;
4617
4618 cap_free(cap);
4619 return r;
4620}
4621
9beb3f4d
LP		 4622char* strshorten(char *s, size_t l) {
4623 assert(s);
4624
4625 if (l < strlen(s))
4626 s[l] = 0;
4627
4628 return s;
4629}
4630
4631static bool hostname_valid_char(char c) {
4632 return
4633 (c >= 'a' && c <= 'z') ||
4634 (c >= 'A' && c <= 'Z') ||
4635 (c >= '0' && c <= '9') ||
4636 c == '-' ||
4637 c == '_' ||
4638 c == '.';
4639}
4640
4641bool hostname_is_valid(const char *s) {
4642 const char *p;
4643
4644 if (isempty(s))
4645 return false;
4646
4647 for (p = s; *p; p++)
4648 if (!hostname_valid_char(*p))
4649 return false;
4650
4651 if (p-s > HOST_NAME_MAX)
4652 return false;
4653
4654 return true;
4655}
4656
4657char* hostname_cleanup(char *s) {
4658 char *p, *d;
4659
4660 for (p = s, d = s; *p; p++)
4661 if ((*p >= 'a' && *p <= 'z') ||
4662 (*p >= 'A' && *p <= 'Z') ||
4663 (*p >= '0' && *p <= '9') ||
4664 *p == '-' ||
4665 *p == '_' ||
4666 *p == '.')
4667 *(d++) = *p;
4668
4669 *d = 0;
4670
4671 strshorten(s, HOST_NAME_MAX);
4672 return s;
4673}
4674
1325aa42
LP		 4675int pipe_eof(int fd) {
4676 struct pollfd pollfd;
4677 int r;
4678
4679 zero(pollfd);
4680 pollfd.fd = fd;
4681 pollfd.events = POLLIN|POLLHUP;
4682
4683 r = poll(&pollfd, 1, 0);
4684 if (r < 0)
4685 return -errno;
4686
4687 if (r == 0)
4688 return 0;
4689
4690 return pollfd.revents & POLLHUP;
4691}
4692
5a3ab509
LP		 4693int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
4694 FILE *f;
4695 char *t;
4696 const char *fn;
4697 size_t k;
4698 int fd;
4699
4700 assert(path);
4701 assert(_f);
4702 assert(_temp_path);
4703
4704 t = new(char, strlen(path) + 1 + 6 + 1);
4705 if (!t)
4706 return -ENOMEM;
4707
4708 fn = file_name_from_path(path);
4709 k = fn-path;
4710 memcpy(t, path, k);
4711 t[k] = '.';
4712 stpcpy(stpcpy(t+k+1, fn), "XXXXXX");
4713
4714 fd = mkostemp(t, O_WRONLY|O_CLOEXEC);
4715 if (fd < 0) {
4716 free(t);
4717 return -errno;
4718 }
4719
4720 f = fdopen(fd, "we");
4721 if (!f) {
4722 unlink(t);
4723 free(t);
4724 return -errno;
4725 }
4726
4727 *_f = f;
4728 *_temp_path = t;
4729
4730 return 0;
4731}
4732
6ea832a2 4733int terminal_vhangup_fd(int fd) {
5a3ab509
LP		 4734 assert(fd >= 0);
4735
6ea832a2
LP		 4736 if (ioctl(fd, TIOCVHANGUP) < 0)
4737 return -errno;
4738
4739 return 0;
4740}
4741
4742int terminal_vhangup(const char *name) {
4743 int fd, r;
4744
4745 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4746 if (fd < 0)
4747 return fd;
4748
4749 r = terminal_vhangup_fd(fd);
4750 close_nointr_nofail(fd);
4751
4752 return r;
4753}
4754
4755int vt_disallocate(const char *name) {
4756 int fd, r;
4757 unsigned u;
6ea832a2
LP		 4758
4759 /* Deallocate the VT if possible. If not possible
4760 * (i.e. because it is the active one), at least clear it
4761 * entirely (including the scrollback buffer) */
4762
b83bc4e9
LP		 4763 if (!startswith(name, "/dev/"))
4764 return -EINVAL;
4765
4766 if (!tty_is_vc(name)) {
4767 /* So this is not a VT. I guess we cannot deallocate
4768 * it then. But let's at least clear the screen */
4769
4770 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4771 if (fd < 0)
4772 return fd;
4773
8585357a
LP		 4774 loop_write(fd,
4775 "\033[r" /* clear scrolling region */
4776 "\033[H" /* move home */
4777 "\033[2J", /* clear screen */
4778 10, false);
b83bc4e9
LP		 4779 close_nointr_nofail(fd);
4780
4781 return 0;
4782 }
6ea832a2
LP		 4783
4784 if (!startswith(name, "/dev/tty"))
4785 return -EINVAL;
4786
4787 r = safe_atou(name+8, &u);
4788 if (r < 0)
4789 return r;
4790
4791 if (u <= 0)
b83bc4e9 4792 return -EINVAL;
6ea832a2 4793
b83bc4e9 4794 /* Try to deallocate */
6ea832a2
LP		 4795 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
4796 if (fd < 0)
4797 return fd;
4798
4799 r = ioctl(fd, VT_DISALLOCATE, u);
b83bc4e9 4800 close_nointr_nofail(fd);
6ea832a2 4801
b83bc4e9
LP		 4802 if (r >= 0)
4803 return 0;
6ea832a2 4804
b83bc4e9 4805 if (errno != EBUSY)
6ea832a2 4806 return -errno;
6ea832a2 4807
b83bc4e9
LP		 4808 /* Couldn't deallocate, so let's clear it fully with
4809 * scrollback */
4810 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
6ea832a2 4811 if (fd < 0)
b83bc4e9 4812 return fd;
6ea832a2 4813
8585357a
LP		 4814 loop_write(fd,
4815 "\033[r" /* clear scrolling region */
4816 "\033[H" /* move home */
4817 "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */
4818 10, false);
b83bc4e9 4819 close_nointr_nofail(fd);
6ea832a2 4820
b83bc4e9 4821 return 0;
6ea832a2
LP		 4822}
4823
db1413d7
KS		 4824static int files_add(Hashmap *h, const char *path, const char *suffix) {
4825 DIR *dir;
f782b8d0 4826 struct dirent buffer, *de;
db1413d7
KS		 4827 int r = 0;
4828
4829 dir = opendir(path);
4830 if (!dir) {
4831 if (errno == ENOENT)
4832 return 0;
4833 return -errno;
4834 }
4835
f782b8d0
LP		 4836 for (;;) {
4837 int k;
223a3558 4838 char *p, *f;
f782b8d0
LP		 4839
4840 k = readdir_r(dir, &buffer, &de);
4841 if (k != 0) {
4842 r = -k;
4843 goto finish;
4844 }
4845
4846 if (!de)
4847 break;
db1413d7 4848
87d2c1ff 4849 if (!dirent_is_file_with_suffix(de, suffix))
db1413d7
KS		 4850 continue;
4851
223a3558 4852 if (asprintf(&p, "%s/%s", path, de->d_name) < 0) {
db1413d7
KS		 4853 r = -ENOMEM;
4854 goto finish;
4855 }
4856
223a3558
KS		 4857 f = canonicalize_file_name(p);
4858 if (!f) {
4859 log_error("Failed to canonicalize file name '%s': %m", p);
4860 free(p);
4861 continue;
4862 }
4863 free(p);
4864
db1413d7 4865 log_debug("found: %s\n", f);
f782b8d0 4866 if (hashmap_put(h, file_name_from_path(f), f) <= 0)
db1413d7
KS		 4867 free(f);
4868 }
4869
4870finish:
4871 closedir(dir);
4872 return r;
4873}
4874
4875static int base_cmp(const void *a, const void *b) {
4876 const char *s1, *s2;
4877
4878 s1 = *(char * const *)a;
4879 s2 = *(char * const *)b;
4880 return strcmp(file_name_from_path(s1), file_name_from_path(s2));
4881}
4882
44143309 4883int conf_files_list(char ***strv, const char *suffix, const char *dir, ...) {
223a3558
KS		 4884 Hashmap *fh = NULL;
4885 char **dirs = NULL;
db1413d7 4886 char **files = NULL;
223a3558 4887 char **p;
db1413d7 4888 va_list ap;
44143309 4889 int r = 0;
db1413d7 4890
223a3558
KS		 4891 va_start(ap, dir);
4892 dirs = strv_new_ap(dir, ap);
4893 va_end(ap);
4894 if (!dirs) {
4895 r = -ENOMEM;
4896 goto finish;
4897 }
4898 if (!strv_path_canonicalize(dirs)) {
4899 r = -ENOMEM;
4900 goto finish;
4901 }
4902 if (!strv_uniq(dirs)) {
4903 r = -ENOMEM;
4904 goto finish;
4905 }
4906
db1413d7
KS		 4907 fh = hashmap_new(string_hash_func, string_compare_func);
4908 if (!fh) {
44143309 4909 r = -ENOMEM;
db1413d7
KS		 4910 goto finish;
4911 }
4912
223a3558
KS		 4913 STRV_FOREACH(p, dirs) {
4914 if (files_add(fh, *p, suffix) < 0) {
db1413d7 4915 log_error("Failed to search for files.");
44143309 4916 r = -EINVAL;
db1413d7
KS		 4917 goto finish;
4918 }
db1413d7 4919 }
db1413d7
KS		 4920
4921 files = hashmap_get_strv(fh);
4922 if (files == NULL) {
4923 log_error("Failed to compose list of files.");
44143309 4924 r = -ENOMEM;
db1413d7
KS		 4925 goto finish;
4926 }
4927
4928 qsort(files, hashmap_size(fh), sizeof(char *), base_cmp);
8d0e38a2 4929
db1413d7 4930finish:
223a3558 4931 strv_free(dirs);
db1413d7 4932 hashmap_free(fh);
44143309
KS		 4933 *strv = files;
4934 return r;
db1413d7 4935}
7948c4df 4936
2076cf88 4937int hwclock_is_localtime(void) {
7948c4df 4938 FILE *f;
7948c4df
KS		 4939 bool local = false;
4940
4941 /*
4942 * The third line of adjtime is "UTC" or "LOCAL" or nothing.
4943 * # /etc/adjtime
2076cf88 4944 * 0.0 0 0
7948c4df
KS		 4945 * 0
4946 * UTC
4947 */
4948 f = fopen("/etc/adjtime", "re");
4949 if (f) {
2076cf88
LP		 4950 char line[LINE_MAX];
4951 bool b;
4952
4953 b = fgets(line, sizeof(line), f) &&
4954 fgets(line, sizeof(line), f) &&
4955 fgets(line, sizeof(line), f);
4956
7948c4df 4957 fclose(f);
2076cf88
LP		 4958
4959 if (!b)
4960 return -EIO;
4961
4962
4963 truncate_nl(line);
4964 local = streq(line, "LOCAL");
4965
4966 } else if (errno != -ENOENT)
4967 return -errno;
4968
7948c4df
KS		 4969 return local;
4970}
4971
ff4daf5a 4972int hwclock_apply_localtime_delta(int *min) {
7948c4df 4973 const struct timeval *tv_null = NULL;
2076cf88 4974 struct timespec ts;
7948c4df
KS		 4975 struct tm *tm;
4976 int minuteswest;
4977 struct timezone tz;
4978
2076cf88
LP		 4979 assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
4980 assert_se(tm = localtime(&ts.tv_sec));
7948c4df
KS		 4981 minuteswest = tm->tm_gmtoff / 60;
4982
4983 tz.tz_minuteswest = -minuteswest;
4984 tz.tz_dsttime = 0; /* DST_NONE*/
4985
4986 /*
4987 * If the hardware clock does not run in UTC, but in local time:
4988 * The very first time we set the kernel's timezone, it will warp
4989 * the clock so that it runs in UTC instead of local time.
4990 */
4991 if (settimeofday(tv_null, &tz) < 0)
4992 return -errno;
ff4daf5a
KS		 4993 if (min)
4994 *min = minuteswest;
4995 return 0;
2076cf88
LP		 4996}
4997
4998int hwclock_reset_localtime_delta(void) {
4999 const struct timeval *tv_null = NULL;
5000 struct timezone tz;
5001
5002 tz.tz_minuteswest = 0;
5003 tz.tz_dsttime = 0; /* DST_NONE*/
5004
5005 if (settimeofday(tv_null, &tz) < 0)
5006 return -errno;
5007
5008 return 0;
7948c4df
KS		 5009}
5010
5011int hwclock_get_time(struct tm *tm) {
5012 int fd;
5013 int err = 0;
5014
2076cf88
LP		 5015 assert(tm);
5016
7948c4df
KS		 5017 fd = open("/dev/rtc0", O_RDONLY|O_CLOEXEC);
5018 if (fd < 0)
5019 return -errno;
2076cf88
LP		 5020
5021 /* This leaves the timezone fields of struct tm
5022 * uninitialized! */
7948c4df
KS		 5023 if (ioctl(fd, RTC_RD_TIME, tm) < 0)
5024 err = -errno;
2076cf88
LP		 5025
5026 /* We don't now daylight saving, so we reset this in order not
5027 * to confused mktime(). */
5028 tm->tm_isdst = -1;
5029
5030 close_nointr_nofail(fd);
7948c4df
KS		 5031
5032 return err;
5033}
5034
5035int hwclock_set_time(const struct tm *tm) {
5036 int fd;
5037 int err = 0;
5038
2076cf88
LP		 5039 assert(tm);
5040
7948c4df
KS		 5041 fd = open("/dev/rtc0", O_RDONLY|O_CLOEXEC);
5042 if (fd < 0)
5043 return -errno;
2076cf88 5044
7948c4df
KS		 5045 if (ioctl(fd, RTC_SET_TIME, tm) < 0)
5046 err = -errno;
2076cf88
LP		 5047
5048 close_nointr_nofail(fd);
7948c4df
KS		 5049
5050 return err;
5051}
f41607a6 5052
34ca941c
LP		 5053int copy_file(const char *from, const char *to) {
5054 int r, fdf, fdt;
5055
5056 assert(from);
5057 assert(to);
5058
5059 fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY);
5060 if (fdf < 0)
5061 return -errno;
5062
5063 fdt = open(to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY, 0644);
5064 if (fdt < 0) {
5065 close_nointr_nofail(fdf);
5066 return -errno;
5067 }
5068
5069 for (;;) {
5070 char buf[PIPE_BUF];
5071 ssize_t n, k;
5072
5073 n = read(fdf, buf, sizeof(buf));
5074 if (n < 0) {
5075 r = -errno;
5076
5077 close_nointr_nofail(fdf);
5078 close_nointr(fdt);
5079 unlink(to);
5080
5081 return r;
5082 }
5083
5084 if (n == 0)
5085 break;
5086
5087 errno = 0;
5088 k = loop_write(fdt, buf, n, false);
5089 if (n != k) {
5090 r = k < 0 ? k : (errno ? -errno : -EIO);
5091
5092 close_nointr_nofail(fdf);
5093 close_nointr(fdt);
5094
5095 unlink(to);
5096 return r;
5097 }
5098 }
5099
5100 close_nointr_nofail(fdf);
5101 r = close_nointr(fdt);
5102
5103 if (r < 0) {
5104 unlink(to);
5105 return r;
5106 }
5107
5108 return 0;
5109}
5110
5111int symlink_or_copy(const char *from, const char *to) {
5112 char *pf = NULL, *pt = NULL;
5113 struct stat a, b;
5114 int r;
5115
5116 assert(from);
5117 assert(to);
5118
5119 if (parent_of_path(from, &pf) < 0 ||
5120 parent_of_path(to, &pt) < 0) {
5121 r = -ENOMEM;
5122 goto finish;
5123 }
5124
5125 if (stat(pf, &a) < 0 ||
5126 stat(pt, &b) < 0) {
5127 r = -errno;
5128 goto finish;
5129 }
5130
5131 if (a.st_dev != b.st_dev) {
5132 free(pf);
5133 free(pt);
5134
5135 return copy_file(from, to);
5136 }
5137
5138 if (symlink(from, to) < 0) {
5139 r = -errno;
5140 goto finish;
5141 }
5142
5143 r = 0;
5144
5145finish:
5146 free(pf);
5147 free(pt);
5148
5149 return r;
5150}
5151
5152int symlink_or_copy_atomic(const char *from, const char *to) {
5153 char *t, *x;
5154 const char *fn;
5155 size_t k;
5156 unsigned long long ull;
5157 unsigned i;
5158 int r;
5159
5160 assert(from);
5161 assert(to);
5162
5163 t = new(char, strlen(to) + 1 + 16 + 1);
5164 if (!t)
5165 return -ENOMEM;
5166
5167 fn = file_name_from_path(to);
5168 k = fn-to;
5169 memcpy(t, to, k);
5170 t[k] = '.';
5171 x = stpcpy(t+k+1, fn);
5172
5173 ull = random_ull();
5174 for (i = 0; i < 16; i++) {
5175 *(x++) = hexchar(ull & 0xF);
5176 ull >>= 4;
5177 }
5178
5179 *x = 0;
5180
5181 r = symlink_or_copy(from, t);
5182 if (r < 0) {
5183 unlink(t);
5184 free(t);
5185 return r;
5186 }
5187
5188 if (rename(t, to) < 0) {
5189 r = -errno;
5190 unlink(t);
5191 free(t);
5192 return r;
5193 }
5194
5195 free(t);
5196 return r;
5197}
5198
98a28fef 5199int audit_session_from_pid(pid_t pid, uint32_t *id) {
87d2c1ff 5200 char *s;
98a28fef
LP		 5201 uint32_t u;
5202 int r;
5203
98a28fef
LP		 5204 assert(id);
5205
5206 if (have_effective_cap(CAP_AUDIT_CONTROL) <= 0)
5207 return -ENOENT;
5208
87d2c1ff
LP		 5209 if (pid == 0)
5210 r = read_one_line_file("/proc/self/sessionid", &s);
5211 else {
5212 char *p;
5213
5214 if (asprintf(&p, "/proc/%lu/sessionid", (unsigned long) pid) < 0)
5215 return -ENOMEM;
5216
5217 r = read_one_line_file(p, &s);
5218 free(p);
5219 }
98a28fef 5220
98a28fef
LP		 5221 if (r < 0)
5222 return r;
5223
5224 r = safe_atou32(s, &u);
5225 free(s);
5226
5227 if (r < 0)
5228 return r;
5229
5230 if (u == (uint32_t) -1 || u <= 0)
5231 return -ENOENT;
5232
5233 *id = u;
5234 return 0;
5235}
5236
87d2c1ff
LP		 5237int audit_loginuid_from_pid(pid_t pid, uid_t *uid) {
5238 char *s;
5239 uid_t u;
5240 int r;
5241
5242 assert(uid);
5243
5244 /* Only use audit login uid if we are executed with sufficient
5245 * capabilities so that pam_loginuid could do its job. If we
5246 * are lacking the CAP_AUDIT_CONTROL capabality we most likely
5247 * are being run in a container and /proc/self/loginuid is
5248 * useless since it probably contains a uid of the host
5249 * system. */
5250
5251 if (have_effective_cap(CAP_AUDIT_CONTROL) <= 0)
5252 return -ENOENT;
5253
5254 if (pid == 0)
5255 r = read_one_line_file("/proc/self/loginuid", &s);
5256 else {
5257 char *p;
5258
5259 if (asprintf(&p, "/proc/%lu/loginuid", (unsigned long) pid) < 0)
5260 return -ENOMEM;
5261
5262 r = read_one_line_file(p, &s);
5263 free(p);
5264 }
5265
5266 if (r < 0)
5267 return r;
5268
5269 r = parse_uid(s, &u);
5270 free(s);
5271
5272 if (r < 0)
5273 return r;
5274
5275 if (u == (uid_t) -1)
5276 return -ENOENT;
5277
5278 *uid = (uid_t) u;
5279 return 0;
5280}
5281
4d6d6518
LP		 5282bool display_is_local(const char *display) {
5283 assert(display);
5284
5285 return
5286 display[0] == ':' &&
5287 display[1] >= '0' &&
5288 display[1] <= '9';
5289}
5290
5291int socket_from_display(const char *display, char **path) {
5292 size_t k;
5293 char *f, *c;
5294
5295 assert(display);
5296 assert(path);
5297
5298 if (!display_is_local(display))
5299 return -EINVAL;
5300
5301 k = strspn(display+1, "0123456789");
5302
5303 f = new(char, sizeof("/tmp/.X11-unix/X") + k);
5304 if (!f)
5305 return -ENOMEM;
5306
5307 c = stpcpy(f, "/tmp/.X11-unix/X");
5308 memcpy(c, display+1, k);
5309 c[k] = 0;
5310
5311 *path = f;
5312
5313 return 0;
5314}
5315
1cccf435
MV		 5316int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) {
5317 struct passwd *p;
ddd88763 5318 uid_t u;
1cccf435
MV		 5319
5320 assert(username);
5321 assert(*username);
1cccf435
MV		 5322
5323 /* We enforce some special rules for uid=0: in order to avoid
5324 * NSS lookups for root we hardcode its data. */
5325
5326 if (streq(*username, "root") || streq(*username, "0")) {
5327 *username = "root";
4b67834e
LP		 5328
5329 if (uid)
5330 *uid = 0;
5331
5332 if (gid)
5333 *gid = 0;
5334
5335 if (home)
5336 *home = "/root";
1cccf435
MV		 5337 return 0;
5338 }
5339
ddd88763 5340 if (parse_uid(*username, &u) >= 0) {
1cccf435 5341 errno = 0;
ddd88763 5342 p = getpwuid(u);
1cccf435
MV		 5343
5344 /* If there are multiple users with the same id, make
5345 * sure to leave $USER to the configured value instead
5346 * of the first occurrence in the database. However if
5347 * the uid was configured by a numeric uid, then let's
5348 * pick the real username from /etc/passwd. */
5349 if (p)
5350 *username = p->pw_name;
5351 } else {
5352 errno = 0;
5353 p = getpwnam(*username);
5354 }
5355
5356 if (!p)
5357 return errno != 0 ? -errno : -ESRCH;
5358
4b67834e
LP		 5359 if (uid)
5360 *uid = p->pw_uid;
5361
5362 if (gid)
5363 *gid = p->pw_gid;
5364
5365 if (home)
5366 *home = p->pw_dir;
5367
5368 return 0;
5369}
5370
5371int get_group_creds(const char **groupname, gid_t *gid) {
5372 struct group *g;
5373 gid_t id;
5374
5375 assert(groupname);
5376
5377 /* We enforce some special rules for gid=0: in order to avoid
5378 * NSS lookups for root we hardcode its data. */
5379
5380 if (streq(*groupname, "root") || streq(*groupname, "0")) {
5381 *groupname = "root";
5382
5383 if (gid)
5384 *gid = 0;
5385
5386 return 0;
5387 }
5388
5389 if (parse_gid(*groupname, &id) >= 0) {
5390 errno = 0;
5391 g = getgrgid(id);
5392
5393 if (g)
5394 *groupname = g->gr_name;
5395 } else {
5396 errno = 0;
5397 g = getgrnam(*groupname);
5398 }
5399
5400 if (!g)
5401 return errno != 0 ? -errno : -ESRCH;
5402
5403 if (gid)
5404 *gid = g->gr_gid;
5405
1cccf435
MV		 5406 return 0;
5407}
5408
8092a428
LP		 5409int glob_exists(const char *path) {
5410 glob_t g;
5411 int r, k;
5412
5413 assert(path);
5414
5415 zero(g);
5416 errno = 0;
5417 k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
5418
5419 if (k == GLOB_NOMATCH)
5420 r = 0;
5421 else if (k == GLOB_NOSPACE)
5422 r = -ENOMEM;
5423 else if (k == 0)
5424 r = !strv_isempty(g.gl_pathv);
5425 else
5426 r = errno ? -errno : -EIO;
5427
5428 globfree(&g);
5429
5430 return r;
5431}
5432
83096483
LP		 5433int dirent_ensure_type(DIR *d, struct dirent *de) {
5434 struct stat st;
5435
5436 assert(d);
5437 assert(de);
5438
5439 if (de->d_type != DT_UNKNOWN)
5440 return 0;
5441
5442 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
5443 return -errno;
5444
5445 de->d_type =
5446 S_ISREG(st.st_mode) ? DT_REG :
5447 S_ISDIR(st.st_mode) ? DT_DIR :
5448 S_ISLNK(st.st_mode) ? DT_LNK :
5449 S_ISFIFO(st.st_mode) ? DT_FIFO :
5450 S_ISSOCK(st.st_mode) ? DT_SOCK :
5451 S_ISCHR(st.st_mode) ? DT_CHR :
5452 S_ISBLK(st.st_mode) ? DT_BLK :
5453 DT_UNKNOWN;
5454
5455 return 0;
5456}
5457
5458int in_search_path(const char *path, char **search) {
5459 char **i, *parent;
5460 int r;
5461
5462 r = parent_of_path(path, &parent);
5463 if (r < 0)
5464 return r;
5465
5466 r = 0;
5467
5468 STRV_FOREACH(i, search) {
5469 if (path_equal(parent, *i)) {
5470 r = 1;
5471 break;
5472 }
5473 }
5474
5475 free(parent);
5476
5477 return r;
5478}
5479
034a2a52
LP		 5480int get_files_in_directory(const char *path, char ***list) {
5481 DIR *d;
5482 int r = 0;
5483 unsigned n = 0;
5484 char **l = NULL;
5485
5486 assert(path);
d60ef526
LP		 5487
5488 /* Returns all files in a directory in *list, and the number
5489 * of files as return value. If list is NULL returns only the
5490 * number */
034a2a52
LP		 5491
5492 d = opendir(path);
8ea913b2
LP		 5493 if (!d)
5494 return -errno;
5495
034a2a52
LP		 5496 for (;;) {
5497 struct dirent buffer, *de;
5498 int k;
5499
5500 k = readdir_r(d, &buffer, &de);
5501 if (k != 0) {
5502 r = -k;
5503 goto finish;
5504 }
5505
5506 if (!de)
5507 break;
5508
5509 dirent_ensure_type(d, de);
5510
5511 if (!dirent_is_file(de))
5512 continue;
5513
d60ef526
LP		 5514 if (list) {
5515 if ((unsigned) r >= n) {
5516 char **t;
034a2a52 5517
d60ef526
LP		 5518 n = MAX(16, 2*r);
5519 t = realloc(l, sizeof(char*) * n);
5520 if (!t) {
5521 r = -ENOMEM;
5522 goto finish;
5523 }
034a2a52 5524
d60ef526
LP		 5525 l = t;
5526 }
034a2a52 5527
d60ef526 5528 assert((unsigned) r < n);
034a2a52 5529
d60ef526
LP		 5530 l[r] = strdup(de->d_name);
5531 if (!l[r]) {
5532 r = -ENOMEM;
5533 goto finish;
5534 }
034a2a52 5535
d60ef526
LP		 5536 l[++r] = NULL;
5537 } else
5538 r++;
034a2a52
LP		 5539 }
5540
5541finish:
5542 if (d)
5543 closedir(d);
5544
d60ef526
LP		 5545 if (r >= 0) {
5546 if (list)
5547 *list = l;
5548 } else
034a2a52
LP		 5549 strv_free(l);
5550
5551 return r;
5552}
5553
911a4828
LP		 5554char *join(const char *x, ...) {
5555 va_list ap;
5556 size_t l;
5557 char *r, *p;
5558
5559 va_start(ap, x);
5560
5561 if (x) {
5562 l = strlen(x);
5563
5564 for (;;) {
5565 const char *t;
5566
5567 t = va_arg(ap, const char *);
5568 if (!t)
5569 break;
5570
5571 l += strlen(t);
5572 }
5573 } else
5574 l = 0;
5575
5576 va_end(ap);
5577
5578 r = new(char, l+1);
5579 if (!r)
5580 return NULL;
5581
5582 if (x) {
5583 p = stpcpy(r, x);
5584
5585 va_start(ap, x);
5586
5587 for (;;) {
5588 const char *t;
5589
5590 t = va_arg(ap, const char *);
5591 if (!t)
5592 break;
5593
5594 p = stpcpy(p, t);
5595 }
8ea913b2
LP		 5596
5597 va_end(ap);
911a4828
LP		 5598 } else
5599 r[0] = 0;
5600
5601 return r;
5602}
5603
b636465b
LP		 5604bool is_main_thread(void) {
5605 static __thread int cached = 0;
5606
5607 if (_unlikely_(cached == 0))
5608 cached = getpid() == gettid() ? 1 : -1;
5609
5610 return cached > 0;
5611}
5612
94959f0f
LP		 5613int block_get_whole_disk(dev_t d, dev_t *ret) {
5614 char *p, *s;
5615 int r;
5616 unsigned n, m;
5617
5618 assert(ret);
5619
5620 /* If it has a queue this is good enough for us */
5621 if (asprintf(&p, "/sys/dev/block/%u:%u/queue", major(d), minor(d)) < 0)
5622 return -ENOMEM;
5623
5624 r = access(p, F_OK);
5625 free(p);
5626
5627 if (r >= 0) {
5628 *ret = d;
5629 return 0;
5630 }
5631
5632 /* If it is a partition find the originating device */
5633 if (asprintf(&p, "/sys/dev/block/%u:%u/partition", major(d), minor(d)) < 0)
5634 return -ENOMEM;
5635
5636 r = access(p, F_OK);
5637 free(p);
5638
5639 if (r < 0)
5640 return -ENOENT;
5641
5642 /* Get parent dev_t */
5643 if (asprintf(&p, "/sys/dev/block/%u:%u/../dev", major(d), minor(d)) < 0)
5644 return -ENOMEM;
5645
5646 r = read_one_line_file(p, &s);
5647 free(p);
5648
5649 if (r < 0)
5650 return r;
5651
5652 r = sscanf(s, "%u:%u", &m, &n);
5653 free(s);
5654
5655 if (r != 2)
5656 return -EINVAL;
5657
5658 /* Only return this if it is really good enough for us. */
5659 if (asprintf(&p, "/sys/dev/block/%u:%u/queue", m, n) < 0)
5660 return -ENOMEM;
5661
5662 r = access(p, F_OK);
5663 free(p);
5664
5665 if (r >= 0) {
5666 *ret = makedev(m, n);
5667 return 0;
5668 }
5669
5670 return -ENOENT;
5671}
5672
ad293f5a
LP		 5673int file_is_sticky(const char *p) {
5674 struct stat st;
5675
5676 assert(p);
5677
5678 if (lstat(p, &st) < 0)
5679 return -errno;
5680
5681 return
5682 st.st_uid == 0 &&
5683 (st.st_mode & S_ISVTX);
5684}
94959f0f 5685
f41607a6
LP		 5686static const char *const ioprio_class_table[] = {
5687 [IOPRIO_CLASS_NONE] = "none",
5688 [IOPRIO_CLASS_RT] = "realtime",
5689 [IOPRIO_CLASS_BE] = "best-effort",
5690 [IOPRIO_CLASS_IDLE] = "idle"
5691};
5692
5693DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int);
5694
5695static const char *const sigchld_code_table[] = {
5696 [CLD_EXITED] = "exited",
5697 [CLD_KILLED] = "killed",
5698 [CLD_DUMPED] = "dumped",
5699 [CLD_TRAPPED] = "trapped",
5700 [CLD_STOPPED] = "stopped",
5701 [CLD_CONTINUED] = "continued",
5702};
5703
5704DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
5705
5706static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = {
5707 [LOG_FAC(LOG_KERN)] = "kern",
5708 [LOG_FAC(LOG_USER)] = "user",
5709 [LOG_FAC(LOG_MAIL)] = "mail",
5710 [LOG_FAC(LOG_DAEMON)] = "daemon",
5711 [LOG_FAC(LOG_AUTH)] = "auth",
5712 [LOG_FAC(LOG_SYSLOG)] = "syslog",
5713 [LOG_FAC(LOG_LPR)] = "lpr",
5714 [LOG_FAC(LOG_NEWS)] = "news",
5715 [LOG_FAC(LOG_UUCP)] = "uucp",
5716 [LOG_FAC(LOG_CRON)] = "cron",
5717 [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
5718 [LOG_FAC(LOG_FTP)] = "ftp",
5719 [LOG_FAC(LOG_LOCAL0)] = "local0",
5720 [LOG_FAC(LOG_LOCAL1)] = "local1",
5721 [LOG_FAC(LOG_LOCAL2)] = "local2",
5722 [LOG_FAC(LOG_LOCAL3)] = "local3",
5723 [LOG_FAC(LOG_LOCAL4)] = "local4",
5724 [LOG_FAC(LOG_LOCAL5)] = "local5",
5725 [LOG_FAC(LOG_LOCAL6)] = "local6",
5726 [LOG_FAC(LOG_LOCAL7)] = "local7"
5727};
5728
5729DEFINE_STRING_TABLE_LOOKUP(log_facility_unshifted, int);
5730
5731static const char *const log_level_table[] = {
5732 [LOG_EMERG] = "emerg",
5733 [LOG_ALERT] = "alert",
5734 [LOG_CRIT] = "crit",
5735 [LOG_ERR] = "err",
5736 [LOG_WARNING] = "warning",
5737 [LOG_NOTICE] = "notice",
5738 [LOG_INFO] = "info",
5739 [LOG_DEBUG] = "debug"
5740};
5741
5742DEFINE_STRING_TABLE_LOOKUP(log_level, int);
5743
5744static const char* const sched_policy_table[] = {
5745 [SCHED_OTHER] = "other",
5746 [SCHED_BATCH] = "batch",
5747 [SCHED_IDLE] = "idle",
5748 [SCHED_FIFO] = "fifo",
5749 [SCHED_RR] = "rr"
5750};
5751
5752DEFINE_STRING_TABLE_LOOKUP(sched_policy, int);
5753
5754static const char* const rlimit_table[] = {
5755 [RLIMIT_CPU] = "LimitCPU",
5756 [RLIMIT_FSIZE] = "LimitFSIZE",
5757 [RLIMIT_DATA] = "LimitDATA",
5758 [RLIMIT_STACK] = "LimitSTACK",
5759 [RLIMIT_CORE] = "LimitCORE",
5760 [RLIMIT_RSS] = "LimitRSS",
5761 [RLIMIT_NOFILE] = "LimitNOFILE",
5762 [RLIMIT_AS] = "LimitAS",
5763 [RLIMIT_NPROC] = "LimitNPROC",
5764 [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
5765 [RLIMIT_LOCKS] = "LimitLOCKS",
5766 [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
5767 [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
5768 [RLIMIT_NICE] = "LimitNICE",
5769 [RLIMIT_RTPRIO] = "LimitRTPRIO",
5770 [RLIMIT_RTTIME] = "LimitRTTIME"
5771};
5772
5773DEFINE_STRING_TABLE_LOOKUP(rlimit, int);
5774
5775static const char* const ip_tos_table[] = {
5776 [IPTOS_LOWDELAY] = "low-delay",
5777 [IPTOS_THROUGHPUT] = "throughput",
5778 [IPTOS_RELIABILITY] = "reliability",
5779 [IPTOS_LOWCOST] = "low-cost",
5780};
5781
5782DEFINE_STRING_TABLE_LOOKUP(ip_tos, int);
5783
4e240ab0 5784static const char *const __signal_table[] = {
f41607a6
LP		 5785 [SIGHUP] = "HUP",
5786 [SIGINT] = "INT",
5787 [SIGQUIT] = "QUIT",
5788 [SIGILL] = "ILL",
5789 [SIGTRAP] = "TRAP",
5790 [SIGABRT] = "ABRT",
5791 [SIGBUS] = "BUS",
5792 [SIGFPE] = "FPE",
5793 [SIGKILL] = "KILL",
5794 [SIGUSR1] = "USR1",
5795 [SIGSEGV] = "SEGV",
5796 [SIGUSR2] = "USR2",
5797 [SIGPIPE] = "PIPE",
5798 [SIGALRM] = "ALRM",
5799 [SIGTERM] = "TERM",
5800#ifdef SIGSTKFLT
5801 [SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */
5802#endif
5803 [SIGCHLD] = "CHLD",
5804 [SIGCONT] = "CONT",
5805 [SIGSTOP] = "STOP",
5806 [SIGTSTP] = "TSTP",
5807 [SIGTTIN] = "TTIN",
5808 [SIGTTOU] = "TTOU",
5809 [SIGURG] = "URG",
5810 [SIGXCPU] = "XCPU",
5811 [SIGXFSZ] = "XFSZ",
5812 [SIGVTALRM] = "VTALRM",
5813 [SIGPROF] = "PROF",
5814 [SIGWINCH] = "WINCH",
5815 [SIGIO] = "IO",
5816 [SIGPWR] = "PWR",
5817 [SIGSYS] = "SYS"
5818};
5819
4e240ab0
MS		 5820DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int);
5821
5822const char *signal_to_string(int signo) {
5823 static __thread char buf[12];
5824 const char *name;
5825
5826 name = __signal_to_string(signo);
5827 if (name)
5828 return name;
5829
5830 if (signo >= SIGRTMIN && signo <= SIGRTMAX)
5831 snprintf(buf, sizeof(buf) - 1, "RTMIN+%d", signo - SIGRTMIN);
5832 else
5833 snprintf(buf, sizeof(buf) - 1, "%d", signo);
5834 char_array_0(buf);
5835 return buf;
5836}
5837
5838int signal_from_string(const char *s) {
5839 int signo;
5840 int offset = 0;
5841 unsigned u;
5842
5843 signo =__signal_from_string(s);
5844 if (signo > 0)
5845 return signo;
5846
5847 if (startswith(s, "RTMIN+")) {
5848 s += 6;
5849 offset = SIGRTMIN;
5850 }
5851 if (safe_atou(s, &u) >= 0) {
5852 signo = (int) u + offset;
5853 if (signo > 0 && signo < _NSIG)
5854 return signo;
5855 }
5856 return -1;
5857}
65457142
FC		 5858
5859bool kexec_loaded(void) {
5860 bool loaded = false;
5861 char *s;
5862
5863 if (read_one_line_file("/sys/kernel/kexec_loaded", &s) >= 0) {
5864 if (s[0] == '1')
5865 loaded = true;
5866 free(s);
5867 }
5868 return loaded;
5869}
fb9de93d
LP		 5870
5871int strdup_or_null(const char *a, char **b) {
5872 char *c;
5873
5874 assert(b);
5875
5876 if (!a) {
5877 *b = NULL;
5878 return 0;
5879 }
5880
5881 c = strdup(a);
5882 if (!c)
5883 return -ENOMEM;
5884
5885 *b = c;
5886 return 0;
5887}
87d2c1ff
LP		 5888
5889int prot_from_flags(int flags) {
5890
5891 switch (flags & O_ACCMODE) {
5892
5893 case O_RDONLY:
5894 return PROT_READ;
5895
5896 case O_WRONLY:
5897 return PROT_WRITE;
5898
5899 case O_RDWR:
5900 return PROT_READ|PROT_WRITE;
5901
5902 default:
5903 return -EINVAL;
5904 }
689b9a22 5905
64685e0c
LP		 5906unsigned long cap_last_cap(void) {
5907 static __thread unsigned long saved;
5908 static __thread bool valid = false;
5909 unsigned long p;
5910
5911 if (valid)
5912 return saved;
5913
5914 p = (unsigned long) CAP_LAST_CAP;
5915
5916 if (prctl(PR_CAPBSET_READ, p) < 0) {
5917
5918 /* Hmm, look downwards, until we find one that
5919 * works */
5920 for (p--; p > 0; p --)
5921 if (prctl(PR_CAPBSET_READ, p) >= 0)
5922 break;
5923
5924 } else {
5925
5926 /* Hmm, look upwards, until we find one that doesn't
5927 * work */
5928 for (;; p++)
5929 if (prctl(PR_CAPBSET_READ, p+1) < 0)
5930 break;
5931 }
5932
5933 saved = p;
5934 valid = true;
5935
5936 return p;
87d2c1ff 5937}
Unnamed repository; edit this file 'description' to name the repository.