]> git.ipfire.org Git - thirdparty/systemd.git/blame - src/util.c
projects / thirdparty / systemd.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
journald: enforce some syntax restrictions on field names sent from the client side
[thirdparty/systemd.git] / src / util.c
CommitLineData
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
50f20cfd 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
72f59706 3908unsigned columns(void) {
fa776d8e
LP		 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
72f59706
LP		 3951char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
3952 size_t x;
8fe914ec
LP		 3953 char *r;
3954
3955 assert(s);
3956 assert(percent <= 100);
72f59706 3957 assert(new_length >= 3);
8fe914ec 3958
72f59706
LP		 3959 if (old_length <= 3 || old_length <= new_length)
3960 return strndup(s, old_length);
8fe914ec 3961
72f59706
LP		 3962 r = new0(char, new_length+1);
3963 if (!r)
8fe914ec
LP		 3964 return r;
3965
72f59706 3966 x = (new_length * percent) / 100;
8fe914ec 3967
72f59706
LP		 3968 if (x > new_length - 3)
3969 x = new_length - 3;
8fe914ec
LP		 3970
3971 memcpy(r, s, x);
3972 r[x] = '.';
3973 r[x+1] = '.';
3974 r[x+2] = '.';
3975 memcpy(r + x + 3,
72f59706
LP		 3976 s + old_length - (new_length - x - 3),
3977 new_length - x - 3);
8fe914ec
LP		 3978
3979 return r;
3980}
3981
72f59706
LP		 3982char *ellipsize(const char *s, size_t length, unsigned percent) {
3983 return ellipsize_mem(s, strlen(s), length, percent);
3984}
3985
f6144808
LP		 3986int touch(const char *path) {
3987 int fd;
3988
3989 assert(path);
3990
14f3c825 3991 if ((fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644)) < 0)
f6144808
LP		 3992 return -errno;
3993
3994 close_nointr_nofail(fd);
3995 return 0;
3996}
afea26ad 3997
97c4a07d 3998char *unquote(const char *s, const char* quotes) {
11ce3427
LP		 3999 size_t l;
4000 assert(s);
4001
4002 if ((l = strlen(s)) < 2)
4003 return strdup(s);
4004
97c4a07d 4005 if (strchr(quotes, s[0]) && s[l-1] == s[0])
11ce3427
LP		 4006 return strndup(s+1, l-2);
4007
4008 return strdup(s);
4009}
4010
5f7c426e
LP		 4011char *normalize_env_assignment(const char *s) {
4012 char *name, *value, *p, *r;
4013
4014 p = strchr(s, '=');
4015
4016 if (!p) {
4017 if (!(r = strdup(s)))
4018 return NULL;
4019
4020 return strstrip(r);
4021 }
4022
4023 if (!(name = strndup(s, p - s)))
4024 return NULL;
4025
4026 if (!(p = strdup(p+1))) {
4027 free(name);
4028 return NULL;
4029 }
4030
4031 value = unquote(strstrip(p), QUOTES);
4032 free(p);
4033
4034 if (!value) {
5f7c426e
LP		 4035 free(name);
4036 return NULL;
4037 }
4038
4039 if (asprintf(&r, "%s=%s", name, value) < 0)
4040 r = NULL;
4041
4042 free(value);
4043 free(name);
4044
4045 return r;
4046}
4047
8e12a6ae 4048int wait_for_terminate(pid_t pid, siginfo_t *status) {
1968a360
LP		 4049 siginfo_t dummy;
4050
2e78aa99 4051 assert(pid >= 1);
1968a360
LP		 4052
4053 if (!status)
4054 status = &dummy;
2e78aa99
LP		 4055
4056 for (;;) {
8e12a6ae
LP		 4057 zero(*status);
4058
4059 if (waitid(P_PID, pid, status, WEXITED) < 0) {
2e78aa99
LP		 4060
4061 if (errno == EINTR)
4062 continue;
4063
4064 return -errno;
4065 }
4066
4067 return 0;
4068 }
4069}
4070
97c4a07d
LP		 4071int wait_for_terminate_and_warn(const char *name, pid_t pid) {
4072 int r;
4073 siginfo_t status;
4074
4075 assert(name);
4076 assert(pid > 1);
4077
4078 if ((r = wait_for_terminate(pid, &status)) < 0) {
4079 log_warning("Failed to wait for %s: %s", name, strerror(-r));
4080 return r;
4081 }
4082
4083 if (status.si_code == CLD_EXITED) {
4084 if (status.si_status != 0) {
4085 log_warning("%s failed with error code %i.", name, status.si_status);
0a27cf3f 4086 return status.si_status;
97c4a07d
LP		 4087 }
4088
4089 log_debug("%s succeeded.", name);
4090 return 0;
4091
4092 } else if (status.si_code == CLD_KILLED ||
4093 status.si_code == CLD_DUMPED) {
4094
4095 log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
4096 return -EPROTO;
4097 }
4098
4099 log_warning("%s failed due to unknown reason.", name);
4100 return -EPROTO;
4101
4102}
4103
3c14d26c 4104void freeze(void) {
720ce21d
LP		 4105
4106 /* Make sure nobody waits for us on a socket anymore */
4107 close_all_fds(NULL, 0);
4108
c29597a1
LP		 4109 sync();
4110
3c14d26c
LP		 4111 for (;;)
4112 pause();
4113}
4114
00dc5d76
LP		 4115bool null_or_empty(struct stat *st) {
4116 assert(st);
4117
4118 if (S_ISREG(st->st_mode) && st->st_size <= 0)
4119 return true;
4120
c8f26f42 4121 if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode))
00dc5d76
LP		 4122 return true;
4123
4124 return false;
4125}
4126
83096483
LP		 4127int null_or_empty_path(const char *fn) {
4128 struct stat st;
4129
4130 assert(fn);
4131
4132 if (stat(fn, &st) < 0)
4133 return -errno;
4134
4135 return null_or_empty(&st);
4136}
4137
a247755d 4138DIR *xopendirat(int fd, const char *name, int flags) {
c4731d11
LP		 4139 int nfd;
4140 DIR *d;
4141
4142 if ((nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags)) < 0)
4143 return NULL;
4144
4145 if (!(d = fdopendir(nfd))) {
4146 close_nointr_nofail(nfd);
4147 return NULL;
4148 }
4149
4150 return d;
3b63d2d3
LP		 4151}
4152
8a0867d6
LP		 4153int signal_from_string_try_harder(const char *s) {
4154 int signo;
4155 assert(s);
4156
4157 if ((signo = signal_from_string(s)) <= 0)
4158 if (startswith(s, "SIG"))
4159 return signal_from_string(s+3);
4160
4161 return signo;
4162}
4163
10717a1a
LP		 4164void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) {
4165
4166 assert(f);
4167 assert(name);
4168 assert(t);
4169
4170 if (!dual_timestamp_is_set(t))
4171 return;
4172
4173 fprintf(f, "%s=%llu %llu\n",
4174 name,
4175 (unsigned long long) t->realtime,
4176 (unsigned long long) t->monotonic);
4177}
4178
799fd0fd 4179void dual_timestamp_deserialize(const char *value, dual_timestamp *t) {
10717a1a
LP		 4180 unsigned long long a, b;
4181
10717a1a
LP		 4182 assert(value);
4183 assert(t);
4184
4185 if (sscanf(value, "%lli %llu", &a, &b) != 2)
4186 log_debug("Failed to parse finish timestamp value %s", value);
4187 else {
4188 t->realtime = a;
4189 t->monotonic = b;
4190 }
4191}
4192
e23a0ce8
LP		 4193char *fstab_node_to_udev_node(const char *p) {
4194 char *dn, *t, *u;
4195 int r;
4196
4197 /* FIXME: to follow udev's logic 100% we need to leave valid
4198 * UTF8 chars unescaped */
4199
4200 if (startswith(p, "LABEL=")) {
4201
4202 if (!(u = unquote(p+6, "\"\'")))
4203 return NULL;
4204
4205 t = xescape(u, "/ ");
4206 free(u);
4207
4208 if (!t)
4209 return NULL;
4210
4211 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
4212 free(t);
4213
4214 if (r < 0)
4215 return NULL;
4216
4217 return dn;
4218 }
4219
4220 if (startswith(p, "UUID=")) {
4221
4222 if (!(u = unquote(p+5, "\"\'")))
4223 return NULL;
4224
4225 t = xescape(u, "/ ");
4226 free(u);
4227
4228 if (!t)
4229 return NULL;
4230
0058d7b9 4231 r = asprintf(&dn, "/dev/disk/by-uuid/%s", t);
e23a0ce8
LP		 4232 free(t);
4233
4234 if (r < 0)
4235 return NULL;
4236
4237 return dn;
4238 }
4239
4240 return strdup(p);
4241}
4242
e9ddabc2
LP		 4243void filter_environ(const char *prefix) {
4244 int i, j;
4245 assert(prefix);
4246
4247 if (!environ)
4248 return;
4249
4250 for (i = 0, j = 0; environ[i]; i++) {
4251
4252 if (startswith(environ[i], prefix))
4253 continue;
4254
4255 environ[j++] = environ[i];
4256 }
4257
4258 environ[j] = NULL;
4259}
4260
f212ac12
LP		 4261bool tty_is_vc(const char *tty) {
4262 assert(tty);
4263
4264 if (startswith(tty, "/dev/"))
4265 tty += 5;
4266
98a28fef
LP		 4267 return vtnr_from_tty(tty) >= 0;
4268}
4269
4270int vtnr_from_tty(const char *tty) {
4271 int i, r;
4272
4273 assert(tty);
4274
4275 if (startswith(tty, "/dev/"))
4276 tty += 5;
4277
4278 if (!startswith(tty, "tty") )
4279 return -EINVAL;
4280
4281 if (tty[3] < '0' || tty[3] > '9')
4282 return -EINVAL;
4283
4284 r = safe_atoi(tty+3, &i);
4285 if (r < 0)
4286 return r;
4287
4288 if (i < 0 || i > 63)
4289 return -EINVAL;
4290
4291 return i;
f212ac12
LP		 4292}
4293
e3aa71c3 4294const char *default_term_for_tty(const char *tty) {
3030ccd7
LP		 4295 char *active = NULL;
4296 const char *term;
4297
e3aa71c3
LP		 4298 assert(tty);
4299
4300 if (startswith(tty, "/dev/"))
4301 tty += 5;
4302
3030ccd7
LP		 4303 /* Resolve where /dev/console is pointing when determining
4304 * TERM */
4305 if (streq(tty, "console"))
4306 if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
079a09fb
LP		 4307 /* If multiple log outputs are configured the
4308 * last one is what /dev/console points to */
4309 if ((tty = strrchr(active, ' ')))
4310 tty++;
4311 else
4312 tty = active;
3030ccd7
LP		 4313 }
4314
f212ac12 4315 term = tty_is_vc(tty) ? "TERM=linux" : "TERM=vt100";
3030ccd7 4316 free(active);
e3aa71c3 4317
3030ccd7 4318 return term;
e3aa71c3
LP		 4319}
4320
87d2c1ff 4321bool dirent_is_file(const struct dirent *de) {
fb19a739
LP		 4322 assert(de);
4323
4324 if (ignore_file(de->d_name))
4325 return false;
4326
4327 if (de->d_type != DT_REG &&
4328 de->d_type != DT_LNK &&
4329 de->d_type != DT_UNKNOWN)
4330 return false;
4331
4332 return true;
4333}
4334
87d2c1ff
LP		 4335bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) {
4336 assert(de);
4337
4338 if (!dirent_is_file(de))
4339 return false;
4340
4341 return endswith(de->d_name, suffix);
4342}
4343
83cc030f
LP		 4344void execute_directory(const char *directory, DIR *d, char *argv[]) {
4345 DIR *_d = NULL;
4346 struct dirent *de;
4347 Hashmap *pids = NULL;
4348
4349 assert(directory);
4350
4351 /* Executes all binaries in a directory in parallel and waits
4352 * until all they all finished. */
4353
4354 if (!d) {
4355 if (!(_d = opendir(directory))) {
4356
4357 if (errno == ENOENT)
4358 return;
4359
4360 log_error("Failed to enumerate directory %s: %m", directory);
4361 return;
4362 }
4363
4364 d = _d;
4365 }
4366
4367 if (!(pids = hashmap_new(trivial_hash_func, trivial_compare_func))) {
4368 log_error("Failed to allocate set.");
4369 goto finish;
4370 }
4371
4372 while ((de = readdir(d))) {
4373 char *path;
4374 pid_t pid;
4375 int k;
4376
fb19a739 4377 if (!dirent_is_file(de))
83cc030f
LP		 4378 continue;
4379
4380 if (asprintf(&path, "%s/%s", directory, de->d_name) < 0) {
4381 log_error("Out of memory");
4382 continue;
4383 }
4384
4385 if ((pid = fork()) < 0) {
4386 log_error("Failed to fork: %m");
4387 free(path);
4388 continue;
4389 }
4390
4391 if (pid == 0) {
4392 char *_argv[2];
4393 /* Child */
4394
4395 if (!argv) {
4396 _argv[0] = path;
4397 _argv[1] = NULL;
4398 argv = _argv;
4399 } else
4400 if (!argv[0])
4401 argv[0] = path;
4402
4403 execv(path, argv);
4404
4405 log_error("Failed to execute %s: %m", path);
4406 _exit(EXIT_FAILURE);
4407 }
4408
4409 log_debug("Spawned %s as %lu", path, (unsigned long) pid);
4410
4411 if ((k = hashmap_put(pids, UINT_TO_PTR(pid), path)) < 0) {
4412 log_error("Failed to add PID to set: %s", strerror(-k));
4413 free(path);
4414 }
4415 }
4416
4417 while (!hashmap_isempty(pids)) {
4418 siginfo_t si;
4419 char *path;
4420
4421 zero(si);
4422 if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
4423
4424 if (errno == EINTR)
4425 continue;
4426
4427 log_error("waitid() failed: %m");
4428 goto finish;
4429 }
4430
4431 if ((path = hashmap_remove(pids, UINT_TO_PTR(si.si_pid)))) {
4432 if (!is_clean_exit(si.si_code, si.si_status)) {
4433 if (si.si_code == CLD_EXITED)
4434 log_error("%s exited with exit status %i.", path, si.si_status);
4435 else
4436 log_error("%s terminated by signal %s.", path, signal_to_string(si.si_status));
4437 } else
4438 log_debug("%s exited successfully.", path);
4439
4440 free(path);
4441 }
4442 }
4443
4444finish:
4445 if (_d)
4446 closedir(_d);
4447
4448 if (pids)
4449 hashmap_free_free(pids);
4450}
4451
430c18ed
LP		 4452int kill_and_sigcont(pid_t pid, int sig) {
4453 int r;
4454
4455 r = kill(pid, sig) < 0 ? -errno : 0;
4456
4457 if (r >= 0)
4458 kill(pid, SIGCONT);
4459
4460 return r;
4461}
4462
05feefe0
LP		 4463bool nulstr_contains(const char*nulstr, const char *needle) {
4464 const char *i;
4465
4466 if (!nulstr)
4467 return false;
4468
4469 NULSTR_FOREACH(i, nulstr)
4470 if (streq(i, needle))
4471 return true;
4472
4473 return false;
4474}
4475
6faa1114 4476bool plymouth_running(void) {
9408a2d2 4477 return access("/run/plymouth/pid", F_OK) >= 0;
6faa1114
LP		 4478}
4479
7c3b203c
LP		 4480void parse_syslog_priority(char **p, int *priority) {
4481 int a = 0, b = 0, c = 0;
4482 int k;
4483
4484 assert(p);
4485 assert(*p);
4486 assert(priority);
4487
4488 if ((*p)[0] != '<')
4489 return;
4490
4491 if (!strchr(*p, '>'))
4492 return;
4493
4494 if ((*p)[2] == '>') {
4495 c = undecchar((*p)[1]);
4496 k = 3;
4497 } else if ((*p)[3] == '>') {
4498 b = undecchar((*p)[1]);
4499 c = undecchar((*p)[2]);
4500 k = 4;
4501 } else if ((*p)[4] == '>') {
4502 a = undecchar((*p)[1]);
4503 b = undecchar((*p)[2]);
4504 c = undecchar((*p)[3]);
4505 k = 5;
4506 } else
4507 return;
4508
4509 if (a < 0 || b < 0 || c < 0)
4510 return;
4511
4512 *priority = a*100+b*10+c;
4513 *p += k;
4514}
4515
87d2c1ff
LP		 4516void skip_syslog_pid(char **buf) {
4517 char *p;
4518
4519 assert(buf);
4520 assert(*buf);
4521
4522 p = *buf;
4523
4524 if (*p != '[')
4525 return;
4526
4527 p++;
4528 p += strspn(p, "0123456789");
4529
4530 if (*p != ']')
4531 return;
4532
4533 p++;
4534
4535 *buf = p;
4536}
4537
4538void skip_syslog_date(char **buf) {
4539 enum {
4540 LETTER,
4541 SPACE,
4542 NUMBER,
4543 SPACE_OR_NUMBER,
4544 COLON
4545 } sequence[] = {
4546 LETTER, LETTER, LETTER,
4547 SPACE,
4548 SPACE_OR_NUMBER, NUMBER,
4549 SPACE,
4550 SPACE_OR_NUMBER, NUMBER,
4551 COLON,
4552 SPACE_OR_NUMBER, NUMBER,
4553 COLON,
4554 SPACE_OR_NUMBER, NUMBER,
4555 SPACE
4556 };
4557
4558 char *p;
4559 unsigned i;
4560
4561 assert(buf);
4562 assert(*buf);
4563
4564 p = *buf;
4565
4566 for (i = 0; i < ELEMENTSOF(sequence); i++, p++) {
4567
4568 if (!*p)
4569 return;
4570
4571 switch (sequence[i]) {
4572
4573 case SPACE:
4574 if (*p != ' ')
4575 return;
4576 break;
4577
4578 case SPACE_OR_NUMBER:
4579 if (*p == ' ')
4580 break;
4581
4582 /* fall through */
4583
4584 case NUMBER:
4585 if (*p < '0' || *p > '9')
4586 return;
4587
4588 break;
4589
4590 case LETTER:
4591 if (!(*p >= 'A' && *p <= 'Z') &&
4592 !(*p >= 'a' && *p <= 'z'))
4593 return;
4594
4595 break;
4596
4597 case COLON:
4598 if (*p != ':')
4599 return;
4600 break;
4601
4602 }
4603 }
4604
4605 *buf = p;
4606}
4607
ac123445
LP		 4608int have_effective_cap(int value) {
4609 cap_t cap;
4610 cap_flag_value_t fv;
4611 int r;
4612
4613 if (!(cap = cap_get_proc()))
4614 return -errno;
4615
4616 if (cap_get_flag(cap, value, CAP_EFFECTIVE, &fv) < 0)
4617 r = -errno;
4618 else
4619 r = fv == CAP_SET;
4620
4621 cap_free(cap);
4622 return r;
4623}
4624
9beb3f4d
LP		 4625char* strshorten(char *s, size_t l) {
4626 assert(s);
4627
4628 if (l < strlen(s))
4629 s[l] = 0;
4630
4631 return s;
4632}
4633
4634static bool hostname_valid_char(char c) {
4635 return
4636 (c >= 'a' && c <= 'z') ||
4637 (c >= 'A' && c <= 'Z') ||
4638 (c >= '0' && c <= '9') ||
4639 c == '-' ||
4640 c == '_' ||
4641 c == '.';
4642}
4643
4644bool hostname_is_valid(const char *s) {
4645 const char *p;
4646
4647 if (isempty(s))
4648 return false;
4649
4650 for (p = s; *p; p++)
4651 if (!hostname_valid_char(*p))
4652 return false;
4653
4654 if (p-s > HOST_NAME_MAX)
4655 return false;
4656
4657 return true;
4658}
4659
4660char* hostname_cleanup(char *s) {
4661 char *p, *d;
4662
4663 for (p = s, d = s; *p; p++)
4664 if ((*p >= 'a' && *p <= 'z') ||
4665 (*p >= 'A' && *p <= 'Z') ||
4666 (*p >= '0' && *p <= '9') ||
4667 *p == '-' ||
4668 *p == '_' ||
4669 *p == '.')
4670 *(d++) = *p;
4671
4672 *d = 0;
4673
4674 strshorten(s, HOST_NAME_MAX);
4675 return s;
4676}
4677
1325aa42
LP		 4678int pipe_eof(int fd) {
4679 struct pollfd pollfd;
4680 int r;
4681
4682 zero(pollfd);
4683 pollfd.fd = fd;
4684 pollfd.events = POLLIN|POLLHUP;
4685
4686 r = poll(&pollfd, 1, 0);
4687 if (r < 0)
4688 return -errno;
4689
4690 if (r == 0)
4691 return 0;
4692
4693 return pollfd.revents & POLLHUP;
4694}
4695
5a3ab509
LP		 4696int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
4697 FILE *f;
4698 char *t;
4699 const char *fn;
4700 size_t k;
4701 int fd;
4702
4703 assert(path);
4704 assert(_f);
4705 assert(_temp_path);
4706
4707 t = new(char, strlen(path) + 1 + 6 + 1);
4708 if (!t)
4709 return -ENOMEM;
4710
4711 fn = file_name_from_path(path);
4712 k = fn-path;
4713 memcpy(t, path, k);
4714 t[k] = '.';
4715 stpcpy(stpcpy(t+k+1, fn), "XXXXXX");
4716
4717 fd = mkostemp(t, O_WRONLY|O_CLOEXEC);
4718 if (fd < 0) {
4719 free(t);
4720 return -errno;
4721 }
4722
4723 f = fdopen(fd, "we");
4724 if (!f) {
4725 unlink(t);
4726 free(t);
4727 return -errno;
4728 }
4729
4730 *_f = f;
4731 *_temp_path = t;
4732
4733 return 0;
4734}
4735
6ea832a2 4736int terminal_vhangup_fd(int fd) {
5a3ab509
LP		 4737 assert(fd >= 0);
4738
6ea832a2
LP		 4739 if (ioctl(fd, TIOCVHANGUP) < 0)
4740 return -errno;
4741
4742 return 0;
4743}
4744
4745int terminal_vhangup(const char *name) {
4746 int fd, r;
4747
4748 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4749 if (fd < 0)
4750 return fd;
4751
4752 r = terminal_vhangup_fd(fd);
4753 close_nointr_nofail(fd);
4754
4755 return r;
4756}
4757
4758int vt_disallocate(const char *name) {
4759 int fd, r;
4760 unsigned u;
6ea832a2
LP		 4761
4762 /* Deallocate the VT if possible. If not possible
4763 * (i.e. because it is the active one), at least clear it
4764 * entirely (including the scrollback buffer) */
4765
b83bc4e9
LP		 4766 if (!startswith(name, "/dev/"))
4767 return -EINVAL;
4768
4769 if (!tty_is_vc(name)) {
4770 /* So this is not a VT. I guess we cannot deallocate
4771 * it then. But let's at least clear the screen */
4772
4773 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4774 if (fd < 0)
4775 return fd;
4776
8585357a
LP		 4777 loop_write(fd,
4778 "\033[r" /* clear scrolling region */
4779 "\033[H" /* move home */
4780 "\033[2J", /* clear screen */
4781 10, false);
b83bc4e9
LP		 4782 close_nointr_nofail(fd);
4783
4784 return 0;
4785 }
6ea832a2
LP		 4786
4787 if (!startswith(name, "/dev/tty"))
4788 return -EINVAL;
4789
4790 r = safe_atou(name+8, &u);
4791 if (r < 0)
4792 return r;
4793
4794 if (u <= 0)
b83bc4e9 4795 return -EINVAL;
6ea832a2 4796
b83bc4e9 4797 /* Try to deallocate */
6ea832a2
LP		 4798 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
4799 if (fd < 0)
4800 return fd;
4801
4802 r = ioctl(fd, VT_DISALLOCATE, u);
b83bc4e9 4803 close_nointr_nofail(fd);
6ea832a2 4804
b83bc4e9
LP		 4805 if (r >= 0)
4806 return 0;
6ea832a2 4807
b83bc4e9 4808 if (errno != EBUSY)
6ea832a2 4809 return -errno;
6ea832a2 4810
b83bc4e9
LP		 4811 /* Couldn't deallocate, so let's clear it fully with
4812 * scrollback */
4813 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
6ea832a2 4814 if (fd < 0)
b83bc4e9 4815 return fd;
6ea832a2 4816
8585357a
LP		 4817 loop_write(fd,
4818 "\033[r" /* clear scrolling region */
4819 "\033[H" /* move home */
4820 "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */
4821 10, false);
b83bc4e9 4822 close_nointr_nofail(fd);
6ea832a2 4823
b83bc4e9 4824 return 0;
6ea832a2
LP		 4825}
4826
db1413d7
KS		 4827static int files_add(Hashmap *h, const char *path, const char *suffix) {
4828 DIR *dir;
f782b8d0 4829 struct dirent buffer, *de;
db1413d7
KS		 4830 int r = 0;
4831
4832 dir = opendir(path);
4833 if (!dir) {
4834 if (errno == ENOENT)
4835 return 0;
4836 return -errno;
4837 }
4838
f782b8d0
LP		 4839 for (;;) {
4840 int k;
223a3558 4841 char *p, *f;
f782b8d0
LP		 4842
4843 k = readdir_r(dir, &buffer, &de);
4844 if (k != 0) {
4845 r = -k;
4846 goto finish;
4847 }
4848
4849 if (!de)
4850 break;
db1413d7 4851
87d2c1ff 4852 if (!dirent_is_file_with_suffix(de, suffix))
db1413d7
KS		 4853 continue;
4854
223a3558 4855 if (asprintf(&p, "%s/%s", path, de->d_name) < 0) {
db1413d7
KS		 4856 r = -ENOMEM;
4857 goto finish;
4858 }
4859
223a3558
KS		 4860 f = canonicalize_file_name(p);
4861 if (!f) {
4862 log_error("Failed to canonicalize file name '%s': %m", p);
4863 free(p);
4864 continue;
4865 }
4866 free(p);
4867
db1413d7 4868 log_debug("found: %s\n", f);
f782b8d0 4869 if (hashmap_put(h, file_name_from_path(f), f) <= 0)
db1413d7
KS		 4870 free(f);
4871 }
4872
4873finish:
4874 closedir(dir);
4875 return r;
4876}
4877
4878static int base_cmp(const void *a, const void *b) {
4879 const char *s1, *s2;
4880
4881 s1 = *(char * const *)a;
4882 s2 = *(char * const *)b;
4883 return strcmp(file_name_from_path(s1), file_name_from_path(s2));
4884}
4885
44143309 4886int conf_files_list(char ***strv, const char *suffix, const char *dir, ...) {
223a3558
KS		 4887 Hashmap *fh = NULL;
4888 char **dirs = NULL;
db1413d7 4889 char **files = NULL;
223a3558 4890 char **p;
db1413d7 4891 va_list ap;
44143309 4892 int r = 0;
db1413d7 4893
223a3558
KS		 4894 va_start(ap, dir);
4895 dirs = strv_new_ap(dir, ap);
4896 va_end(ap);
4897 if (!dirs) {
4898 r = -ENOMEM;
4899 goto finish;
4900 }
4901 if (!strv_path_canonicalize(dirs)) {
4902 r = -ENOMEM;
4903 goto finish;
4904 }
4905 if (!strv_uniq(dirs)) {
4906 r = -ENOMEM;
4907 goto finish;
4908 }
4909
db1413d7
KS		 4910 fh = hashmap_new(string_hash_func, string_compare_func);
4911 if (!fh) {
44143309 4912 r = -ENOMEM;
db1413d7
KS		 4913 goto finish;
4914 }
4915
223a3558
KS		 4916 STRV_FOREACH(p, dirs) {
4917 if (files_add(fh, *p, suffix) < 0) {
db1413d7 4918 log_error("Failed to search for files.");
44143309 4919 r = -EINVAL;
db1413d7
KS		 4920 goto finish;
4921 }
db1413d7 4922 }
db1413d7
KS		 4923
4924 files = hashmap_get_strv(fh);
4925 if (files == NULL) {
4926 log_error("Failed to compose list of files.");
44143309 4927 r = -ENOMEM;
db1413d7
KS		 4928 goto finish;
4929 }
4930
4931 qsort(files, hashmap_size(fh), sizeof(char *), base_cmp);
8d0e38a2 4932
db1413d7 4933finish:
223a3558 4934 strv_free(dirs);
db1413d7 4935 hashmap_free(fh);
44143309
KS		 4936 *strv = files;
4937 return r;
db1413d7 4938}
7948c4df 4939
2076cf88 4940int hwclock_is_localtime(void) {
7948c4df 4941 FILE *f;
7948c4df
KS		 4942 bool local = false;
4943
4944 /*
4945 * The third line of adjtime is "UTC" or "LOCAL" or nothing.
4946 * # /etc/adjtime
2076cf88 4947 * 0.0 0 0
7948c4df
KS		 4948 * 0
4949 * UTC
4950 */
4951 f = fopen("/etc/adjtime", "re");
4952 if (f) {
2076cf88
LP		 4953 char line[LINE_MAX];
4954 bool b;
4955
4956 b = fgets(line, sizeof(line), f) &&
4957 fgets(line, sizeof(line), f) &&
4958 fgets(line, sizeof(line), f);
4959
7948c4df 4960 fclose(f);
2076cf88
LP		 4961
4962 if (!b)
4963 return -EIO;
4964
4965
4966 truncate_nl(line);
4967 local = streq(line, "LOCAL");
4968
4969 } else if (errno != -ENOENT)
4970 return -errno;
4971
7948c4df
KS		 4972 return local;
4973}
4974
ff4daf5a 4975int hwclock_apply_localtime_delta(int *min) {
7948c4df 4976 const struct timeval *tv_null = NULL;
2076cf88 4977 struct timespec ts;
7948c4df
KS		 4978 struct tm *tm;
4979 int minuteswest;
4980 struct timezone tz;
4981
2076cf88
LP		 4982 assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
4983 assert_se(tm = localtime(&ts.tv_sec));
7948c4df
KS		 4984 minuteswest = tm->tm_gmtoff / 60;
4985
4986 tz.tz_minuteswest = -minuteswest;
4987 tz.tz_dsttime = 0; /* DST_NONE*/
4988
4989 /*
4990 * If the hardware clock does not run in UTC, but in local time:
4991 * The very first time we set the kernel's timezone, it will warp
4992 * the clock so that it runs in UTC instead of local time.
4993 */
4994 if (settimeofday(tv_null, &tz) < 0)
4995 return -errno;
ff4daf5a
KS		 4996 if (min)
4997 *min = minuteswest;
4998 return 0;
2076cf88
LP		 4999}
5000
5001int hwclock_reset_localtime_delta(void) {
5002 const struct timeval *tv_null = NULL;
5003 struct timezone tz;
5004
5005 tz.tz_minuteswest = 0;
5006 tz.tz_dsttime = 0; /* DST_NONE*/
5007
5008 if (settimeofday(tv_null, &tz) < 0)
5009 return -errno;
5010
5011 return 0;
7948c4df
KS		 5012}
5013
5014int hwclock_get_time(struct tm *tm) {
5015 int fd;
5016 int err = 0;
5017
2076cf88
LP		 5018 assert(tm);
5019
7948c4df
KS		 5020 fd = open("/dev/rtc0", O_RDONLY|O_CLOEXEC);
5021 if (fd < 0)
5022 return -errno;
2076cf88
LP		 5023
5024 /* This leaves the timezone fields of struct tm
5025 * uninitialized! */
7948c4df
KS		 5026 if (ioctl(fd, RTC_RD_TIME, tm) < 0)
5027 err = -errno;
2076cf88
LP		 5028
5029 /* We don't now daylight saving, so we reset this in order not
5030 * to confused mktime(). */
5031 tm->tm_isdst = -1;
5032
5033 close_nointr_nofail(fd);
7948c4df
KS		 5034
5035 return err;
5036}
5037
5038int hwclock_set_time(const struct tm *tm) {
5039 int fd;
5040 int err = 0;
5041
2076cf88
LP		 5042 assert(tm);
5043
7948c4df
KS		 5044 fd = open("/dev/rtc0", O_RDONLY|O_CLOEXEC);
5045 if (fd < 0)
5046 return -errno;
2076cf88 5047
7948c4df
KS		 5048 if (ioctl(fd, RTC_SET_TIME, tm) < 0)
5049 err = -errno;
2076cf88
LP		 5050
5051 close_nointr_nofail(fd);
7948c4df
KS		 5052
5053 return err;
5054}
f41607a6 5055
34ca941c
LP		 5056int copy_file(const char *from, const char *to) {
5057 int r, fdf, fdt;
5058
5059 assert(from);
5060 assert(to);
5061
5062 fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY);
5063 if (fdf < 0)
5064 return -errno;
5065
5066 fdt = open(to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY, 0644);
5067 if (fdt < 0) {
5068 close_nointr_nofail(fdf);
5069 return -errno;
5070 }
5071
5072 for (;;) {
5073 char buf[PIPE_BUF];
5074 ssize_t n, k;
5075
5076 n = read(fdf, buf, sizeof(buf));
5077 if (n < 0) {
5078 r = -errno;
5079
5080 close_nointr_nofail(fdf);
5081 close_nointr(fdt);
5082 unlink(to);
5083
5084 return r;
5085 }
5086
5087 if (n == 0)
5088 break;
5089
5090 errno = 0;
5091 k = loop_write(fdt, buf, n, false);
5092 if (n != k) {
5093 r = k < 0 ? k : (errno ? -errno : -EIO);
5094
5095 close_nointr_nofail(fdf);
5096 close_nointr(fdt);
5097
5098 unlink(to);
5099 return r;
5100 }
5101 }
5102
5103 close_nointr_nofail(fdf);
5104 r = close_nointr(fdt);
5105
5106 if (r < 0) {
5107 unlink(to);
5108 return r;
5109 }
5110
5111 return 0;
5112}
5113
5114int symlink_or_copy(const char *from, const char *to) {
5115 char *pf = NULL, *pt = NULL;
5116 struct stat a, b;
5117 int r;
5118
5119 assert(from);
5120 assert(to);
5121
5122 if (parent_of_path(from, &pf) < 0 ||
5123 parent_of_path(to, &pt) < 0) {
5124 r = -ENOMEM;
5125 goto finish;
5126 }
5127
5128 if (stat(pf, &a) < 0 ||
5129 stat(pt, &b) < 0) {
5130 r = -errno;
5131 goto finish;
5132 }
5133
5134 if (a.st_dev != b.st_dev) {
5135 free(pf);
5136 free(pt);
5137
5138 return copy_file(from, to);
5139 }
5140
5141 if (symlink(from, to) < 0) {
5142 r = -errno;
5143 goto finish;
5144 }
5145
5146 r = 0;
5147
5148finish:
5149 free(pf);
5150 free(pt);
5151
5152 return r;
5153}
5154
5155int symlink_or_copy_atomic(const char *from, const char *to) {
5156 char *t, *x;
5157 const char *fn;
5158 size_t k;
5159 unsigned long long ull;
5160 unsigned i;
5161 int r;
5162
5163 assert(from);
5164 assert(to);
5165
5166 t = new(char, strlen(to) + 1 + 16 + 1);
5167 if (!t)
5168 return -ENOMEM;
5169
5170 fn = file_name_from_path(to);
5171 k = fn-to;
5172 memcpy(t, to, k);
5173 t[k] = '.';
5174 x = stpcpy(t+k+1, fn);
5175
5176 ull = random_ull();
5177 for (i = 0; i < 16; i++) {
5178 *(x++) = hexchar(ull & 0xF);
5179 ull >>= 4;
5180 }
5181
5182 *x = 0;
5183
5184 r = symlink_or_copy(from, t);
5185 if (r < 0) {
5186 unlink(t);
5187 free(t);
5188 return r;
5189 }
5190
5191 if (rename(t, to) < 0) {
5192 r = -errno;
5193 unlink(t);
5194 free(t);
5195 return r;
5196 }
5197
5198 free(t);
5199 return r;
5200}
5201
98a28fef 5202int audit_session_from_pid(pid_t pid, uint32_t *id) {
87d2c1ff 5203 char *s;
98a28fef
LP		 5204 uint32_t u;
5205 int r;
5206
98a28fef
LP		 5207 assert(id);
5208
5209 if (have_effective_cap(CAP_AUDIT_CONTROL) <= 0)
5210 return -ENOENT;
5211
87d2c1ff
LP		 5212 if (pid == 0)
5213 r = read_one_line_file("/proc/self/sessionid", &s);
5214 else {
5215 char *p;
5216
5217 if (asprintf(&p, "/proc/%lu/sessionid", (unsigned long) pid) < 0)
5218 return -ENOMEM;
5219
5220 r = read_one_line_file(p, &s);
5221 free(p);
5222 }
98a28fef 5223
98a28fef
LP		 5224 if (r < 0)
5225 return r;
5226
5227 r = safe_atou32(s, &u);
5228 free(s);
5229
5230 if (r < 0)
5231 return r;
5232
5233 if (u == (uint32_t) -1 || u <= 0)
5234 return -ENOENT;
5235
5236 *id = u;
5237 return 0;
5238}
5239
87d2c1ff
LP		 5240int audit_loginuid_from_pid(pid_t pid, uid_t *uid) {
5241 char *s;
5242 uid_t u;
5243 int r;
5244
5245 assert(uid);
5246
5247 /* Only use audit login uid if we are executed with sufficient
5248 * capabilities so that pam_loginuid could do its job. If we
5249 * are lacking the CAP_AUDIT_CONTROL capabality we most likely
5250 * are being run in a container and /proc/self/loginuid is
5251 * useless since it probably contains a uid of the host
5252 * system. */
5253
5254 if (have_effective_cap(CAP_AUDIT_CONTROL) <= 0)
5255 return -ENOENT;
5256
5257 if (pid == 0)
5258 r = read_one_line_file("/proc/self/loginuid", &s);
5259 else {
5260 char *p;
5261
5262 if (asprintf(&p, "/proc/%lu/loginuid", (unsigned long) pid) < 0)
5263 return -ENOMEM;
5264
5265 r = read_one_line_file(p, &s);
5266 free(p);
5267 }
5268
5269 if (r < 0)
5270 return r;
5271
5272 r = parse_uid(s, &u);
5273 free(s);
5274
5275 if (r < 0)
5276 return r;
5277
5278 if (u == (uid_t) -1)
5279 return -ENOENT;
5280
5281 *uid = (uid_t) u;
5282 return 0;
5283}
5284
4d6d6518
LP		 5285bool display_is_local(const char *display) {
5286 assert(display);
5287
5288 return
5289 display[0] == ':' &&
5290 display[1] >= '0' &&
5291 display[1] <= '9';
5292}
5293
5294int socket_from_display(const char *display, char **path) {
5295 size_t k;
5296 char *f, *c;
5297
5298 assert(display);
5299 assert(path);
5300
5301 if (!display_is_local(display))
5302 return -EINVAL;
5303
5304 k = strspn(display+1, "0123456789");
5305
5306 f = new(char, sizeof("/tmp/.X11-unix/X") + k);
5307 if (!f)
5308 return -ENOMEM;
5309
5310 c = stpcpy(f, "/tmp/.X11-unix/X");
5311 memcpy(c, display+1, k);
5312 c[k] = 0;
5313
5314 *path = f;
5315
5316 return 0;
5317}
5318
1cccf435
MV		 5319int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) {
5320 struct passwd *p;
ddd88763 5321 uid_t u;
1cccf435
MV		 5322
5323 assert(username);
5324 assert(*username);
1cccf435
MV		 5325
5326 /* We enforce some special rules for uid=0: in order to avoid
5327 * NSS lookups for root we hardcode its data. */
5328
5329 if (streq(*username, "root") || streq(*username, "0")) {
5330 *username = "root";
4b67834e
LP		 5331
5332 if (uid)
5333 *uid = 0;
5334
5335 if (gid)
5336 *gid = 0;
5337
5338 if (home)
5339 *home = "/root";
1cccf435
MV		 5340 return 0;
5341 }
5342
ddd88763 5343 if (parse_uid(*username, &u) >= 0) {
1cccf435 5344 errno = 0;
ddd88763 5345 p = getpwuid(u);
1cccf435
MV		 5346
5347 /* If there are multiple users with the same id, make
5348 * sure to leave $USER to the configured value instead
5349 * of the first occurrence in the database. However if
5350 * the uid was configured by a numeric uid, then let's
5351 * pick the real username from /etc/passwd. */
5352 if (p)
5353 *username = p->pw_name;
5354 } else {
5355 errno = 0;
5356 p = getpwnam(*username);
5357 }
5358
5359 if (!p)
5360 return errno != 0 ? -errno : -ESRCH;
5361
4b67834e
LP		 5362 if (uid)
5363 *uid = p->pw_uid;
5364
5365 if (gid)
5366 *gid = p->pw_gid;
5367
5368 if (home)
5369 *home = p->pw_dir;
5370
5371 return 0;
5372}
5373
5374int get_group_creds(const char **groupname, gid_t *gid) {
5375 struct group *g;
5376 gid_t id;
5377
5378 assert(groupname);
5379
5380 /* We enforce some special rules for gid=0: in order to avoid
5381 * NSS lookups for root we hardcode its data. */
5382
5383 if (streq(*groupname, "root") || streq(*groupname, "0")) {
5384 *groupname = "root";
5385
5386 if (gid)
5387 *gid = 0;
5388
5389 return 0;
5390 }
5391
5392 if (parse_gid(*groupname, &id) >= 0) {
5393 errno = 0;
5394 g = getgrgid(id);
5395
5396 if (g)
5397 *groupname = g->gr_name;
5398 } else {
5399 errno = 0;
5400 g = getgrnam(*groupname);
5401 }
5402
5403 if (!g)
5404 return errno != 0 ? -errno : -ESRCH;
5405
5406 if (gid)
5407 *gid = g->gr_gid;
5408
1cccf435
MV		 5409 return 0;
5410}
5411
8092a428
LP		 5412int glob_exists(const char *path) {
5413 glob_t g;
5414 int r, k;
5415
5416 assert(path);
5417
5418 zero(g);
5419 errno = 0;
5420 k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
5421
5422 if (k == GLOB_NOMATCH)
5423 r = 0;
5424 else if (k == GLOB_NOSPACE)
5425 r = -ENOMEM;
5426 else if (k == 0)
5427 r = !strv_isempty(g.gl_pathv);
5428 else
5429 r = errno ? -errno : -EIO;
5430
5431 globfree(&g);
5432
5433 return r;
5434}
5435
83096483
LP		 5436int dirent_ensure_type(DIR *d, struct dirent *de) {
5437 struct stat st;
5438
5439 assert(d);
5440 assert(de);
5441
5442 if (de->d_type != DT_UNKNOWN)
5443 return 0;
5444
5445 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
5446 return -errno;
5447
5448 de->d_type =
5449 S_ISREG(st.st_mode) ? DT_REG :
5450 S_ISDIR(st.st_mode) ? DT_DIR :
5451 S_ISLNK(st.st_mode) ? DT_LNK :
5452 S_ISFIFO(st.st_mode) ? DT_FIFO :
5453 S_ISSOCK(st.st_mode) ? DT_SOCK :
5454 S_ISCHR(st.st_mode) ? DT_CHR :
5455 S_ISBLK(st.st_mode) ? DT_BLK :
5456 DT_UNKNOWN;
5457
5458 return 0;
5459}
5460
5461int in_search_path(const char *path, char **search) {
5462 char **i, *parent;
5463 int r;
5464
5465 r = parent_of_path(path, &parent);
5466 if (r < 0)
5467 return r;
5468
5469 r = 0;
5470
5471 STRV_FOREACH(i, search) {
5472 if (path_equal(parent, *i)) {
5473 r = 1;
5474 break;
5475 }
5476 }
5477
5478 free(parent);
5479
5480 return r;
5481}
5482
034a2a52
LP		 5483int get_files_in_directory(const char *path, char ***list) {
5484 DIR *d;
5485 int r = 0;
5486 unsigned n = 0;
5487 char **l = NULL;
5488
5489 assert(path);
d60ef526
LP		 5490
5491 /* Returns all files in a directory in *list, and the number
5492 * of files as return value. If list is NULL returns only the
5493 * number */
034a2a52
LP		 5494
5495 d = opendir(path);
8ea913b2
LP		 5496 if (!d)
5497 return -errno;
5498
034a2a52
LP		 5499 for (;;) {
5500 struct dirent buffer, *de;
5501 int k;
5502
5503 k = readdir_r(d, &buffer, &de);
5504 if (k != 0) {
5505 r = -k;
5506 goto finish;
5507 }
5508
5509 if (!de)
5510 break;
5511
5512 dirent_ensure_type(d, de);
5513
5514 if (!dirent_is_file(de))
5515 continue;
5516
d60ef526
LP		 5517 if (list) {
5518 if ((unsigned) r >= n) {
5519 char **t;
034a2a52 5520
d60ef526
LP		 5521 n = MAX(16, 2*r);
5522 t = realloc(l, sizeof(char*) * n);
5523 if (!t) {
5524 r = -ENOMEM;
5525 goto finish;
5526 }
034a2a52 5527
d60ef526
LP		 5528 l = t;
5529 }
034a2a52 5530
d60ef526 5531 assert((unsigned) r < n);
034a2a52 5532
d60ef526
LP		 5533 l[r] = strdup(de->d_name);
5534 if (!l[r]) {
5535 r = -ENOMEM;
5536 goto finish;
5537 }
034a2a52 5538
d60ef526
LP		 5539 l[++r] = NULL;
5540 } else
5541 r++;
034a2a52
LP		 5542 }
5543
5544finish:
5545 if (d)
5546 closedir(d);
5547
d60ef526
LP		 5548 if (r >= 0) {
5549 if (list)
5550 *list = l;
5551 } else
034a2a52
LP		 5552 strv_free(l);
5553
5554 return r;
5555}
5556
911a4828
LP		 5557char *join(const char *x, ...) {
5558 va_list ap;
5559 size_t l;
5560 char *r, *p;
5561
5562 va_start(ap, x);
5563
5564 if (x) {
5565 l = strlen(x);
5566
5567 for (;;) {
5568 const char *t;
5569
5570 t = va_arg(ap, const char *);
5571 if (!t)
5572 break;
5573
5574 l += strlen(t);
5575 }
5576 } else
5577 l = 0;
5578
5579 va_end(ap);
5580
5581 r = new(char, l+1);
5582 if (!r)
5583 return NULL;
5584
5585 if (x) {
5586 p = stpcpy(r, x);
5587
5588 va_start(ap, x);
5589
5590 for (;;) {
5591 const char *t;
5592
5593 t = va_arg(ap, const char *);
5594 if (!t)
5595 break;
5596
5597 p = stpcpy(p, t);
5598 }
8ea913b2
LP		 5599
5600 va_end(ap);
911a4828
LP		 5601 } else
5602 r[0] = 0;
5603
5604 return r;
5605}
5606
b636465b
LP		 5607bool is_main_thread(void) {
5608 static __thread int cached = 0;
5609
5610 if (_unlikely_(cached == 0))
5611 cached = getpid() == gettid() ? 1 : -1;
5612
5613 return cached > 0;
5614}
5615
94959f0f
LP		 5616int block_get_whole_disk(dev_t d, dev_t *ret) {
5617 char *p, *s;
5618 int r;
5619 unsigned n, m;
5620
5621 assert(ret);
5622
5623 /* If it has a queue this is good enough for us */
5624 if (asprintf(&p, "/sys/dev/block/%u:%u/queue", major(d), minor(d)) < 0)
5625 return -ENOMEM;
5626
5627 r = access(p, F_OK);
5628 free(p);
5629
5630 if (r >= 0) {
5631 *ret = d;
5632 return 0;
5633 }
5634
5635 /* If it is a partition find the originating device */
5636 if (asprintf(&p, "/sys/dev/block/%u:%u/partition", major(d), minor(d)) < 0)
5637 return -ENOMEM;
5638
5639 r = access(p, F_OK);
5640 free(p);
5641
5642 if (r < 0)
5643 return -ENOENT;
5644
5645 /* Get parent dev_t */
5646 if (asprintf(&p, "/sys/dev/block/%u:%u/../dev", major(d), minor(d)) < 0)
5647 return -ENOMEM;
5648
5649 r = read_one_line_file(p, &s);
5650 free(p);
5651
5652 if (r < 0)
5653 return r;
5654
5655 r = sscanf(s, "%u:%u", &m, &n);
5656 free(s);
5657
5658 if (r != 2)
5659 return -EINVAL;
5660
5661 /* Only return this if it is really good enough for us. */
5662 if (asprintf(&p, "/sys/dev/block/%u:%u/queue", m, n) < 0)
5663 return -ENOMEM;
5664
5665 r = access(p, F_OK);
5666 free(p);
5667
5668 if (r >= 0) {
5669 *ret = makedev(m, n);
5670 return 0;
5671 }
5672
5673 return -ENOENT;
5674}
5675
ad293f5a
LP		 5676int file_is_sticky(const char *p) {
5677 struct stat st;
5678
5679 assert(p);
5680
5681 if (lstat(p, &st) < 0)
5682 return -errno;
5683
5684 return
5685 st.st_uid == 0 &&
5686 (st.st_mode & S_ISVTX);
5687}
94959f0f 5688
f41607a6
LP		 5689static const char *const ioprio_class_table[] = {
5690 [IOPRIO_CLASS_NONE] = "none",
5691 [IOPRIO_CLASS_RT] = "realtime",
5692 [IOPRIO_CLASS_BE] = "best-effort",
5693 [IOPRIO_CLASS_IDLE] = "idle"
5694};
5695
5696DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int);
5697
5698static const char *const sigchld_code_table[] = {
5699 [CLD_EXITED] = "exited",
5700 [CLD_KILLED] = "killed",
5701 [CLD_DUMPED] = "dumped",
5702 [CLD_TRAPPED] = "trapped",
5703 [CLD_STOPPED] = "stopped",
5704 [CLD_CONTINUED] = "continued",
5705};
5706
5707DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
5708
5709static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = {
5710 [LOG_FAC(LOG_KERN)] = "kern",
5711 [LOG_FAC(LOG_USER)] = "user",
5712 [LOG_FAC(LOG_MAIL)] = "mail",
5713 [LOG_FAC(LOG_DAEMON)] = "daemon",
5714 [LOG_FAC(LOG_AUTH)] = "auth",
5715 [LOG_FAC(LOG_SYSLOG)] = "syslog",
5716 [LOG_FAC(LOG_LPR)] = "lpr",
5717 [LOG_FAC(LOG_NEWS)] = "news",
5718 [LOG_FAC(LOG_UUCP)] = "uucp",
5719 [LOG_FAC(LOG_CRON)] = "cron",
5720 [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
5721 [LOG_FAC(LOG_FTP)] = "ftp",
5722 [LOG_FAC(LOG_LOCAL0)] = "local0",
5723 [LOG_FAC(LOG_LOCAL1)] = "local1",
5724 [LOG_FAC(LOG_LOCAL2)] = "local2",
5725 [LOG_FAC(LOG_LOCAL3)] = "local3",
5726 [LOG_FAC(LOG_LOCAL4)] = "local4",
5727 [LOG_FAC(LOG_LOCAL5)] = "local5",
5728 [LOG_FAC(LOG_LOCAL6)] = "local6",
5729 [LOG_FAC(LOG_LOCAL7)] = "local7"
5730};
5731
5732DEFINE_STRING_TABLE_LOOKUP(log_facility_unshifted, int);
5733
5734static const char *const log_level_table[] = {
5735 [LOG_EMERG] = "emerg",
5736 [LOG_ALERT] = "alert",
5737 [LOG_CRIT] = "crit",
5738 [LOG_ERR] = "err",
5739 [LOG_WARNING] = "warning",
5740 [LOG_NOTICE] = "notice",
5741 [LOG_INFO] = "info",
5742 [LOG_DEBUG] = "debug"
5743};
5744
5745DEFINE_STRING_TABLE_LOOKUP(log_level, int);
5746
5747static const char* const sched_policy_table[] = {
5748 [SCHED_OTHER] = "other",
5749 [SCHED_BATCH] = "batch",
5750 [SCHED_IDLE] = "idle",
5751 [SCHED_FIFO] = "fifo",
5752 [SCHED_RR] = "rr"
5753};
5754
5755DEFINE_STRING_TABLE_LOOKUP(sched_policy, int);
5756
5757static const char* const rlimit_table[] = {
5758 [RLIMIT_CPU] = "LimitCPU",
5759 [RLIMIT_FSIZE] = "LimitFSIZE",
5760 [RLIMIT_DATA] = "LimitDATA",
5761 [RLIMIT_STACK] = "LimitSTACK",
5762 [RLIMIT_CORE] = "LimitCORE",
5763 [RLIMIT_RSS] = "LimitRSS",
5764 [RLIMIT_NOFILE] = "LimitNOFILE",
5765 [RLIMIT_AS] = "LimitAS",
5766 [RLIMIT_NPROC] = "LimitNPROC",
5767 [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
5768 [RLIMIT_LOCKS] = "LimitLOCKS",
5769 [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
5770 [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
5771 [RLIMIT_NICE] = "LimitNICE",
5772 [RLIMIT_RTPRIO] = "LimitRTPRIO",
5773 [RLIMIT_RTTIME] = "LimitRTTIME"
5774};
5775
5776DEFINE_STRING_TABLE_LOOKUP(rlimit, int);
5777
5778static const char* const ip_tos_table[] = {
5779 [IPTOS_LOWDELAY] = "low-delay",
5780 [IPTOS_THROUGHPUT] = "throughput",
5781 [IPTOS_RELIABILITY] = "reliability",
5782 [IPTOS_LOWCOST] = "low-cost",
5783};
5784
5785DEFINE_STRING_TABLE_LOOKUP(ip_tos, int);
5786
4e240ab0 5787static const char *const __signal_table[] = {
f41607a6
LP		 5788 [SIGHUP] = "HUP",
5789 [SIGINT] = "INT",
5790 [SIGQUIT] = "QUIT",
5791 [SIGILL] = "ILL",
5792 [SIGTRAP] = "TRAP",
5793 [SIGABRT] = "ABRT",
5794 [SIGBUS] = "BUS",
5795 [SIGFPE] = "FPE",
5796 [SIGKILL] = "KILL",
5797 [SIGUSR1] = "USR1",
5798 [SIGSEGV] = "SEGV",
5799 [SIGUSR2] = "USR2",
5800 [SIGPIPE] = "PIPE",
5801 [SIGALRM] = "ALRM",
5802 [SIGTERM] = "TERM",
5803#ifdef SIGSTKFLT
5804 [SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */
5805#endif
5806 [SIGCHLD] = "CHLD",
5807 [SIGCONT] = "CONT",
5808 [SIGSTOP] = "STOP",
5809 [SIGTSTP] = "TSTP",
5810 [SIGTTIN] = "TTIN",
5811 [SIGTTOU] = "TTOU",
5812 [SIGURG] = "URG",
5813 [SIGXCPU] = "XCPU",
5814 [SIGXFSZ] = "XFSZ",
5815 [SIGVTALRM] = "VTALRM",
5816 [SIGPROF] = "PROF",
5817 [SIGWINCH] = "WINCH",
5818 [SIGIO] = "IO",
5819 [SIGPWR] = "PWR",
5820 [SIGSYS] = "SYS"
5821};
5822
4e240ab0
MS		 5823DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int);
5824
5825const char *signal_to_string(int signo) {
5826 static __thread char buf[12];
5827 const char *name;
5828
5829 name = __signal_to_string(signo);
5830 if (name)
5831 return name;
5832
5833 if (signo >= SIGRTMIN && signo <= SIGRTMAX)
5834 snprintf(buf, sizeof(buf) - 1, "RTMIN+%d", signo - SIGRTMIN);
5835 else
5836 snprintf(buf, sizeof(buf) - 1, "%d", signo);
5837 char_array_0(buf);
5838 return buf;
5839}
5840
5841int signal_from_string(const char *s) {
5842 int signo;
5843 int offset = 0;
5844 unsigned u;
5845
5846 signo =__signal_from_string(s);
5847 if (signo > 0)
5848 return signo;
5849
5850 if (startswith(s, "RTMIN+")) {
5851 s += 6;
5852 offset = SIGRTMIN;
5853 }
5854 if (safe_atou(s, &u) >= 0) {
5855 signo = (int) u + offset;
5856 if (signo > 0 && signo < _NSIG)
5857 return signo;
5858 }
5859 return -1;
5860}
65457142
FC		 5861
5862bool kexec_loaded(void) {
5863 bool loaded = false;
5864 char *s;
5865
5866 if (read_one_line_file("/sys/kernel/kexec_loaded", &s) >= 0) {
5867 if (s[0] == '1')
5868 loaded = true;
5869 free(s);
5870 }
5871 return loaded;
5872}
fb9de93d
LP		 5873
5874int strdup_or_null(const char *a, char **b) {
5875 char *c;
5876
5877 assert(b);
5878
5879 if (!a) {
5880 *b = NULL;
5881 return 0;
5882 }
5883
5884 c = strdup(a);
5885 if (!c)
5886 return -ENOMEM;
5887
5888 *b = c;
5889 return 0;
5890}
87d2c1ff
LP		 5891
5892int prot_from_flags(int flags) {
5893
5894 switch (flags & O_ACCMODE) {
5895
5896 case O_RDONLY:
5897 return PROT_READ;
5898
5899 case O_WRONLY:
5900 return PROT_WRITE;
5901
5902 case O_RDWR:
5903 return PROT_READ|PROT_WRITE;
5904
5905 default:
5906 return -EINVAL;
5907 }
7c99e0c1 5908}
689b9a22 5909
64685e0c
LP		 5910unsigned long cap_last_cap(void) {
5911 static __thread unsigned long saved;
5912 static __thread bool valid = false;
5913 unsigned long p;
5914
5915 if (valid)
5916 return saved;
5917
5918 p = (unsigned long) CAP_LAST_CAP;
5919
5920 if (prctl(PR_CAPBSET_READ, p) < 0) {
5921
5922 /* Hmm, look downwards, until we find one that
5923 * works */
5924 for (p--; p > 0; p --)
5925 if (prctl(PR_CAPBSET_READ, p) >= 0)
5926 break;
5927
5928 } else {
5929
5930 /* Hmm, look upwards, until we find one that doesn't
5931 * work */
5932 for (;; p++)
5933 if (prctl(PR_CAPBSET_READ, p+1) < 0)
5934 break;
5935 }
5936
5937 saved = p;
5938 valid = true;
5939
5940 return p;
87d2c1ff 5941}
Unnamed repository; edit this file 'description' to name the repository.