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dbus: extra protection against dbus calling into us while we are already disconnected
[thirdparty/systemd.git] / util.c
CommitLineData
60918275
LP		 1/*-*- Mode: C; c-basic-offset: 8 -*-*/
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>
60918275
LP		 37
38#include "macro.h"
39#include "util.h"
1dccbe19
LP		 40#include "ioprio.h"
41#include "missing.h"
a9f5d454 42#include "log.h"
65d2ebdc 43#include "strv.h"
60918275 44
47be870b 45usec_t now(clockid_t clock_id) {
60918275
LP		 46 struct timespec ts;
47
47be870b 48 assert_se(clock_gettime(clock_id, &ts) == 0);
60918275
LP		 49
50 return timespec_load(&ts);
51}
52
53usec_t timespec_load(const struct timespec *ts) {
54 assert(ts);
55
56 return
57 (usec_t) ts->tv_sec * USEC_PER_SEC +
58 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
59}
60
61struct timespec *timespec_store(struct timespec *ts, usec_t u) {
62 assert(ts);
63
64 ts->tv_sec = (time_t) (u / USEC_PER_SEC);
65 ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
66
67 return ts;
68}
69
70usec_t timeval_load(const struct timeval *tv) {
71 assert(tv);
72
73 return
74 (usec_t) tv->tv_sec * USEC_PER_SEC +
75 (usec_t) tv->tv_usec;
76}
77
78struct timeval *timeval_store(struct timeval *tv, usec_t u) {
79 assert(tv);
80
81 tv->tv_sec = (time_t) (u / USEC_PER_SEC);
82 tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
83
84 return tv;
85}
86
87bool endswith(const char *s, const char *postfix) {
88 size_t sl, pl;
89
90 assert(s);
91 assert(postfix);
92
93 sl = strlen(s);
94 pl = strlen(postfix);
95
96 if (sl < pl)
97 return false;
98
99 return memcmp(s + sl - pl, postfix, pl) == 0;
100}
101
102bool startswith(const char *s, const char *prefix) {
103 size_t sl, pl;
104
105 assert(s);
106 assert(prefix);
107
108 sl = strlen(s);
109 pl = strlen(prefix);
110
111 if (sl < pl)
112 return false;
113
114 return memcmp(s, prefix, pl) == 0;
115}
116
79d6d816
LP		 117bool first_word(const char *s, const char *word) {
118 size_t sl, wl;
119
120 assert(s);
121 assert(word);
122
123 sl = strlen(s);
124 wl = strlen(word);
125
126 if (sl < wl)
127 return false;
128
129 if (memcmp(s, word, wl) != 0)
130 return false;
131
132 return (s[wl] == 0 ||
133 strchr(WHITESPACE, s[wl]));
134}
135
42f4e3c4 136int close_nointr(int fd) {
60918275
LP		 137 assert(fd >= 0);
138
139 for (;;) {
140 int r;
141
142 if ((r = close(fd)) >= 0)
143 return r;
144
145 if (errno != EINTR)
146 return r;
147 }
148}
85261803 149
85f136b5
LP		 150void close_nointr_nofail(int fd) {
151
152 /* like close_nointr() but cannot fail, and guarantees errno
153 * is unchanged */
154
155 assert_se(close_nointr(fd) == 0);
156}
157
85261803
LP		 158int parse_boolean(const char *v) {
159 assert(v);
160
44d8db9e 161 if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
85261803 162 return 1;
44d8db9e 163 else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
85261803
LP		 164 return 0;
165
166 return -EINVAL;
167}
168
169int safe_atou(const char *s, unsigned *ret_u) {
170 char *x = NULL;
034c6ed7 171 unsigned long l;
85261803
LP		 172
173 assert(s);
174 assert(ret_u);
175
176 errno = 0;
177 l = strtoul(s, &x, 0);
178
179 if (!x || *x || errno)
180 return errno ? -errno : -EINVAL;
181
034c6ed7 182 if ((unsigned long) (unsigned) l != l)
85261803
LP		 183 return -ERANGE;
184
185 *ret_u = (unsigned) l;
186 return 0;
187}
188
189int safe_atoi(const char *s, int *ret_i) {
190 char *x = NULL;
034c6ed7 191 long l;
85261803
LP		 192
193 assert(s);
194 assert(ret_i);
195
196 errno = 0;
197 l = strtol(s, &x, 0);
198
199 if (!x || *x || errno)
200 return errno ? -errno : -EINVAL;
201
034c6ed7 202 if ((long) (int) l != l)
85261803
LP		 203 return -ERANGE;
204
034c6ed7
LP		 205 *ret_i = (int) l;
206 return 0;
207}
208
209int safe_atolu(const char *s, long unsigned *ret_lu) {
210 char *x = NULL;
211 unsigned long l;
212
213 assert(s);
214 assert(ret_lu);
215
216 errno = 0;
217 l = strtoul(s, &x, 0);
218
219 if (!x || *x || errno)
220 return errno ? -errno : -EINVAL;
221
222 *ret_lu = l;
223 return 0;
224}
225
226int safe_atoli(const char *s, long int *ret_li) {
227 char *x = NULL;
228 long l;
229
230 assert(s);
231 assert(ret_li);
232
233 errno = 0;
234 l = strtol(s, &x, 0);
235
236 if (!x || *x || errno)
237 return errno ? -errno : -EINVAL;
238
239 *ret_li = l;
240 return 0;
241}
242
243int safe_atollu(const char *s, long long unsigned *ret_llu) {
244 char *x = NULL;
245 unsigned long long l;
246
247 assert(s);
248 assert(ret_llu);
249
250 errno = 0;
251 l = strtoull(s, &x, 0);
252
253 if (!x || *x || errno)
254 return errno ? -errno : -EINVAL;
255
256 *ret_llu = l;
257 return 0;
258}
259
260int safe_atolli(const char *s, long long int *ret_lli) {
261 char *x = NULL;
262 long long l;
263
264 assert(s);
265 assert(ret_lli);
266
267 errno = 0;
268 l = strtoll(s, &x, 0);
269
270 if (!x || *x || errno)
271 return errno ? -errno : -EINVAL;
272
273 *ret_lli = l;
85261803
LP		 274 return 0;
275}
a41e8209 276
a41e8209 277/* Split a string into words. */
65d2ebdc 278char *split(const char *c, size_t *l, const char *separator, char **state) {
a41e8209
LP		 279 char *current;
280
281 current = *state ? *state : (char*) c;
282
283 if (!*current || *c == 0)
284 return NULL;
285
65d2ebdc
LP		 286 current += strspn(current, separator);
287 *l = strcspn(current, separator);
82919e3d
LP		 288 *state = current+*l;
289
290 return (char*) current;
291}
292
034c6ed7
LP		 293/* Split a string into words, but consider strings enclosed in '' and
294 * "" as words even if they include spaces. */
295char *split_quoted(const char *c, size_t *l, char **state) {
296 char *current;
297
298 current = *state ? *state : (char*) c;
299
300 if (!*current || *c == 0)
301 return NULL;
302
303 current += strspn(current, WHITESPACE);
304
305 if (*current == '\'') {
306 current ++;
307 *l = strcspn(current, "'");
308 *state = current+*l;
309
310 if (**state == '\'')
311 (*state)++;
312 } else if (*current == '\"') {
313 current ++;
b858b600 314 *l = strcspn(current, "\"");
034c6ed7
LP		 315 *state = current+*l;
316
317 if (**state == '\"')
318 (*state)++;
319 } else {
320 *l = strcspn(current, WHITESPACE);
321 *state = current+*l;
322 }
323
44d8db9e
LP		 324 /* FIXME: Cannot deal with strings that have spaces AND ticks
325 * in them */
326
034c6ed7
LP		 327 return (char*) current;
328}
329
65d2ebdc
LP		 330char **split_path_and_make_absolute(const char *p) {
331 char **l;
332 assert(p);
333
334 if (!(l = strv_split(p, ":")))
335 return NULL;
336
337 if (!strv_path_make_absolute_cwd(l)) {
338 strv_free(l);
339 return NULL;
340 }
341
342 return l;
343}
344
034c6ed7
LP		 345int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
346 int r;
347 FILE *f;
348 char fn[132], line[256], *p;
349 long long unsigned ppid;
350
351 assert(pid >= 0);
352 assert(_ppid);
353
354 assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%llu/stat", (unsigned long long) pid) < (int) (sizeof(fn)-1));
355 fn[sizeof(fn)-1] = 0;
356
357 if (!(f = fopen(fn, "r")))
358 return -errno;
359
360 if (!(fgets(line, sizeof(line), f))) {
361 r = -errno;
362 fclose(f);
363 return r;
364 }
365
366 fclose(f);
367
368 /* Let's skip the pid and comm fields. The latter is enclosed
369 * in () but does not escape any () in its value, so let's
370 * skip over it manually */
371
372 if (!(p = strrchr(line, ')')))
373 return -EIO;
374
375 p++;
376
377 if (sscanf(p, " "
378 "%*c " /* state */
379 "%llu ", /* ppid */
380 &ppid) != 1)
381 return -EIO;
382
383 if ((long long unsigned) (pid_t) ppid != ppid)
384 return -ERANGE;
385
386 *_ppid = (pid_t) ppid;
387
388 return 0;
389}
390
391int write_one_line_file(const char *fn, const char *line) {
392 FILE *f;
393 int r;
394
395 assert(fn);
396 assert(line);
397
398 if (!(f = fopen(fn, "we")))
399 return -errno;
400
401 if (fputs(line, f) < 0) {
402 r = -errno;
403 goto finish;
404 }
405
406 r = 0;
407finish:
408 fclose(f);
409 return r;
410}
411
412int read_one_line_file(const char *fn, char **line) {
413 FILE *f;
414 int r;
11316633 415 char t[2048], *c;
034c6ed7
LP		 416
417 assert(fn);
418 assert(line);
419
420 if (!(f = fopen(fn, "re")))
421 return -errno;
422
423 if (!(fgets(t, sizeof(t), f))) {
424 r = -errno;
425 goto finish;
426 }
427
428 if (!(c = strdup(t))) {
429 r = -ENOMEM;
430 goto finish;
431 }
432
433 *line = c;
434 r = 0;
435
436finish:
437 fclose(f);
438 return r;
439}
44d8db9e 440
7072ced8
LP		 441char *truncate_nl(char *s) {
442 assert(s);
443
444 s[strcspn(s, NEWLINE)] = 0;
445 return s;
446}
447
448int get_process_name(pid_t pid, char **name) {
449 char *p;
450 int r;
451
452 assert(pid >= 1);
453 assert(name);
454
455 if (asprintf(&p, "/proc/%llu/comm", (unsigned long long) pid) < 0)
456 return -ENOMEM;
457
458 r = read_one_line_file(p, name);
459 free(p);
460
461 if (r < 0)
462 return r;
463
464 truncate_nl(*name);
465 return 0;
466}
467
44d8db9e
LP		 468char *strappend(const char *s, const char *suffix) {
469 size_t a, b;
470 char *r;
471
472 assert(s);
473 assert(suffix);
474
475 a = strlen(s);
476 b = strlen(suffix);
477
478 if (!(r = new(char, a+b+1)))
479 return NULL;
480
481 memcpy(r, s, a);
482 memcpy(r+a, suffix, b);
483 r[a+b] = 0;
484
485 return r;
486}
87f0e418
LP		 487
488int readlink_malloc(const char *p, char **r) {
489 size_t l = 100;
490
491 assert(p);
492 assert(r);
493
494 for (;;) {
495 char *c;
496 ssize_t n;
497
498 if (!(c = new(char, l)))
499 return -ENOMEM;
500
501 if ((n = readlink(p, c, l-1)) < 0) {
502 int ret = -errno;
503 free(c);
504 return ret;
505 }
506
507 if ((size_t) n < l-1) {
508 c[n] = 0;
509 *r = c;
510 return 0;
511 }
512
513 free(c);
514 l *= 2;
515 }
516}
517
518char *file_name_from_path(const char *p) {
519 char *r;
520
521 assert(p);
522
523 if ((r = strrchr(p, '/')))
524 return r + 1;
525
526 return (char*) p;
527}
0301abf4
LP		 528
529bool path_is_absolute(const char *p) {
530 assert(p);
531
532 return p[0] == '/';
533}
534
535bool is_path(const char *p) {
536
537 return !!strchr(p, '/');
538}
539
540char *path_make_absolute(const char *p, const char *prefix) {
541 char *r;
542
543 assert(p);
544
65d2ebdc
LP		 545 /* Makes every item in the list an absolute path by prepending
546 * the prefix, if specified and necessary */
547
0301abf4
LP		 548 if (path_is_absolute(p) || !prefix)
549 return strdup(p);
550
551 if (asprintf(&r, "%s/%s", prefix, p) < 0)
552 return NULL;
553
554 return r;
555}
2a987ee8 556
65d2ebdc
LP		 557char *path_make_absolute_cwd(const char *p) {
558 char *cwd, *r;
559
560 assert(p);
561
562 /* Similar to path_make_absolute(), but prefixes with the
563 * current working directory. */
564
565 if (path_is_absolute(p))
566 return strdup(p);
567
568 if (!(cwd = get_current_dir_name()))
569 return NULL;
570
571 r = path_make_absolute(p, cwd);
572 free(cwd);
573
574 return r;
575}
576
577char **strv_path_make_absolute_cwd(char **l) {
578 char **s;
579
580 /* Goes through every item in the string list and makes it
581 * absolute. This works in place and won't rollback any
582 * changes on failure. */
583
584 STRV_FOREACH(s, l) {
585 char *t;
586
587 if (!(t = path_make_absolute_cwd(*s)))
588 return NULL;
589
590 free(*s);
591 *s = t;
592 }
593
594 return l;
595}
596
2a987ee8
LP		 597int reset_all_signal_handlers(void) {
598 int sig;
599
600 for (sig = 1; sig < _NSIG; sig++) {
601 struct sigaction sa;
602
603 if (sig == SIGKILL || sig == SIGSTOP)
604 continue;
605
606 zero(sa);
607 sa.sa_handler = SIG_DFL;
431c32bf 608 sa.sa_flags = SA_RESTART;
2a987ee8
LP		 609
610 /* On Linux the first two RT signals are reserved by
611 * glibc, and sigaction() will return EINVAL for them. */
612 if ((sigaction(sig, &sa, NULL) < 0))
613 if (errno != EINVAL)
614 return -errno;
615 }
616
8e274523 617 return 0;
2a987ee8 618}
4a72ff34
LP		 619
620char *strstrip(char *s) {
621 char *e, *l = NULL;
622
623 /* Drops trailing whitespace. Modifies the string in
624 * place. Returns pointer to first non-space character */
625
626 s += strspn(s, WHITESPACE);
627
628 for (e = s; *e; e++)
629 if (!strchr(WHITESPACE, *e))
630 l = e;
631
632 if (l)
633 *(l+1) = 0;
634 else
635 *s = 0;
636
637 return s;
638
639}
640
ee9b5e01
LP		 641char *delete_chars(char *s, const char *bad) {
642 char *f, *t;
643
644 /* Drops all whitespace, regardless where in the string */
645
646 for (f = s, t = s; *f; f++) {
647 if (strchr(bad, *f))
648 continue;
649
650 *(t++) = *f;
651 }
652
653 *t = 0;
654
655 return s;
656}
657
4a72ff34
LP		 658char *file_in_same_dir(const char *path, const char *filename) {
659 char *e, *r;
660 size_t k;
661
662 assert(path);
663 assert(filename);
664
665 /* This removes the last component of path and appends
666 * filename, unless the latter is absolute anyway or the
667 * former isn't */
668
669 if (path_is_absolute(filename))
670 return strdup(filename);
671
672 if (!(e = strrchr(path, '/')))
673 return strdup(filename);
674
675 k = strlen(filename);
676 if (!(r = new(char, e-path+1+k+1)))
677 return NULL;
678
679 memcpy(r, path, e-path+1);
680 memcpy(r+(e-path)+1, filename, k+1);
681
682 return r;
683}
fb624d04 684
a9f5d454
LP		 685int mkdir_parents(const char *path, mode_t mode) {
686 const char *p, *e;
687
688 assert(path);
689
690 /* Creates every parent directory in the path except the last
691 * component. */
692
693 p = path + strspn(path, "/");
694 for (;;) {
695 int r;
696 char *t;
697
698 e = p + strcspn(p, "/");
699 p = e + strspn(e, "/");
700
701 /* Is this the last component? If so, then we're
702 * done */
703 if (*p == 0)
704 return 0;
705
706 if (!(t = strndup(path, e - path)))
707 return -ENOMEM;
708
709 r = mkdir(t, mode);
710
711 free(t);
712
713 if (r < 0 && errno != EEXIST)
714 return -errno;
715 }
716}
717
fb624d04
LP		 718char hexchar(int x) {
719 static const char table[16] = "0123456789abcdef";
720
721 return table[x & 15];
722}
4fe88d28
LP		 723
724int unhexchar(char c) {
725
726 if (c >= '0' && c <= '9')
727 return c - '0';
728
729 if (c >= 'a' && c <= 'f')
ea430986 730 return c - 'a' + 10;
4fe88d28
LP		 731
732 if (c >= 'A' && c <= 'F')
ea430986 733 return c - 'A' + 10;
4fe88d28
LP		 734
735 return -1;
736}
737
738char octchar(int x) {
739 return '0' + (x & 7);
740}
741
742int unoctchar(char c) {
743
744 if (c >= '0' && c <= '7')
745 return c - '0';
746
747 return -1;
748}
749
5af98f82
LP		 750char decchar(int x) {
751 return '0' + (x % 10);
752}
753
754int undecchar(char c) {
755
756 if (c >= '0' && c <= '9')
757 return c - '0';
758
759 return -1;
760}
761
4fe88d28
LP		 762char *cescape(const char *s) {
763 char *r, *t;
764 const char *f;
765
766 assert(s);
767
768 /* Does C style string escaping. */
769
770 if (!(r = new(char, strlen(s)*4 + 1)))
771 return NULL;
772
773 for (f = s, t = r; *f; f++)
774
775 switch (*f) {
776
777 case '\a':
778 *(t++) = '\\';
779 *(t++) = 'a';
780 break;
781 case '\b':
782 *(t++) = '\\';
783 *(t++) = 'b';
784 break;
785 case '\f':
786 *(t++) = '\\';
787 *(t++) = 'f';
788 break;
789 case '\n':
790 *(t++) = '\\';
791 *(t++) = 'n';
792 break;
793 case '\r':
794 *(t++) = '\\';
795 *(t++) = 'r';
796 break;
797 case '\t':
798 *(t++) = '\\';
799 *(t++) = 't';
800 break;
801 case '\v':
802 *(t++) = '\\';
803 *(t++) = 'v';
804 break;
805 case '\\':
806 *(t++) = '\\';
807 *(t++) = '\\';
808 break;
809 case '"':
810 *(t++) = '\\';
811 *(t++) = '"';
812 break;
813 case '\'':
814 *(t++) = '\\';
815 *(t++) = '\'';
816 break;
817
818 default:
819 /* For special chars we prefer octal over
820 * hexadecimal encoding, simply because glib's
821 * g_strescape() does the same */
822 if ((*f < ' ') || (*f >= 127)) {
823 *(t++) = '\\';
824 *(t++) = octchar((unsigned char) *f >> 6);
825 *(t++) = octchar((unsigned char) *f >> 3);
826 *(t++) = octchar((unsigned char) *f);
827 } else
828 *(t++) = *f;
829 break;
830 }
831
832 *t = 0;
833
834 return r;
835}
836
837char *cunescape(const char *s) {
838 char *r, *t;
839 const char *f;
840
841 assert(s);
842
843 /* Undoes C style string escaping */
844
845 if (!(r = new(char, strlen(s)+1)))
846 return r;
847
848 for (f = s, t = r; *f; f++) {
849
850 if (*f != '\\') {
851 *(t++) = *f;
852 continue;
853 }
854
855 f++;
856
857 switch (*f) {
858
859 case 'a':
860 *(t++) = '\a';
861 break;
862 case 'b':
863 *(t++) = '\b';
864 break;
865 case 'f':
866 *(t++) = '\f';
867 break;
868 case 'n':
869 *(t++) = '\n';
870 break;
871 case 'r':
872 *(t++) = '\r';
873 break;
874 case 't':
875 *(t++) = '\t';
876 break;
877 case 'v':
878 *(t++) = '\v';
879 break;
880 case '\\':
881 *(t++) = '\\';
882 break;
883 case '"':
884 *(t++) = '"';
885 break;
886 case '\'':
887 *(t++) = '\'';
888 break;
889
890 case 'x': {
891 /* hexadecimal encoding */
892 int a, b;
893
894 if ((a = unhexchar(f[1])) < 0 ||
895 (b = unhexchar(f[2])) < 0) {
896 /* Invalid escape code, let's take it literal then */
897 *(t++) = '\\';
898 *(t++) = 'x';
899 } else {
900 *(t++) = (char) ((a << 4) | b);
901 f += 2;
902 }
903
904 break;
905 }
906
907 case '0':
908 case '1':
909 case '2':
910 case '3':
911 case '4':
912 case '5':
913 case '6':
914 case '7': {
915 /* octal encoding */
916 int a, b, c;
917
918 if ((a = unoctchar(f[0])) < 0 ||
919 (b = unoctchar(f[1])) < 0 ||
920 (c = unoctchar(f[2])) < 0) {
921 /* Invalid escape code, let's take it literal then */
922 *(t++) = '\\';
923 *(t++) = f[0];
924 } else {
925 *(t++) = (char) ((a << 6) | (b << 3) | c);
926 f += 2;
927 }
928
929 break;
930 }
931
932 case 0:
933 /* premature end of string.*/
934 *(t++) = '\\';
935 goto finish;
936
937 default:
938 /* Invalid escape code, let's take it literal then */
939 *(t++) = '\\';
940 *(t++) = 'f';
941 break;
942 }
943 }
944
945finish:
946 *t = 0;
947 return r;
948}
949
950
951char *xescape(const char *s, const char *bad) {
952 char *r, *t;
953 const char *f;
954
955 /* Escapes all chars in bad, in addition to \ and all special
956 * chars, in \xFF style escaping. May be reversed with
957 * cunescape. */
958
959 if (!(r = new(char, strlen(s)*4+1)))
960 return NULL;
961
962 for (f = s, t = r; *f; f++) {
963
b866264a
LP		 964 if ((*f < ' ') || (*f >= 127) ||
965 (*f == '\\') || strchr(bad, *f)) {
4fe88d28
LP		 966 *(t++) = '\\';
967 *(t++) = 'x';
968 *(t++) = hexchar(*f >> 4);
969 *(t++) = hexchar(*f);
970 } else
971 *(t++) = *f;
972 }
973
974 *t = 0;
975
976 return r;
977}
978
ea430986 979char *bus_path_escape(const char *s) {
ea430986
LP		 980 char *r, *t;
981 const char *f;
982
47be870b
LP		 983 assert(s);
984
ea430986
LP		 985 /* Escapes all chars that D-Bus' object path cannot deal
986 * with. Can be reverse with bus_path_unescape() */
987
988 if (!(r = new(char, strlen(s)*3+1)))
989 return NULL;
990
991 for (f = s, t = r; *f; f++) {
992
993 if (!(*f >= 'A' && *f <= 'Z') &&
994 !(*f >= 'a' && *f <= 'z') &&
995 !(*f >= '0' && *f <= '9')) {
996 *(t++) = '_';
997 *(t++) = hexchar(*f >> 4);
998 *(t++) = hexchar(*f);
999 } else
1000 *(t++) = *f;
1001 }
1002
1003 *t = 0;
1004
1005 return r;
1006}
1007
1008char *bus_path_unescape(const char *s) {
ea430986
LP		 1009 char *r, *t;
1010 const char *f;
1011
47be870b
LP		 1012 assert(s);
1013
ea430986
LP		 1014 if (!(r = new(char, strlen(s)+1)))
1015 return NULL;
1016
1017 for (f = s, t = r; *f; f++) {
1018
1019 if (*f == '_') {
1020 int a, b;
1021
1022 if ((a = unhexchar(f[1])) < 0 ||
1023 (b = unhexchar(f[2])) < 0) {
1024 /* Invalid escape code, let's take it literal then */
1025 *(t++) = '_';
1026 } else {
1027 *(t++) = (char) ((a << 4) | b);
1028 f += 2;
1029 }
1030 } else
1031 *(t++) = *f;
1032 }
1033
1034 *t = 0;
1035
1036 return r;
1037}
1038
4fe88d28
LP		 1039char *path_kill_slashes(char *path) {
1040 char *f, *t;
1041 bool slash = false;
1042
1043 /* Removes redundant inner and trailing slashes. Modifies the
1044 * passed string in-place.
1045 *
1046 * ///foo///bar/ becomes /foo/bar
1047 */
1048
1049 for (f = path, t = path; *f; f++) {
1050
1051 if (*f == '/') {
1052 slash = true;
1053 continue;
1054 }
1055
1056 if (slash) {
1057 slash = false;
1058 *(t++) = '/';
1059 }
1060
1061 *(t++) = *f;
1062 }
1063
1064 /* Special rule, if we are talking of the root directory, a
1065 trailing slash is good */
1066
1067 if (t == path && slash)
1068 *(t++) = '/';
1069
1070 *t = 0;
1071 return path;
1072}
1073
1074bool path_startswith(const char *path, const char *prefix) {
1075 assert(path);
1076 assert(prefix);
1077
1078 if ((path[0] == '/') != (prefix[0] == '/'))
1079 return false;
1080
1081 for (;;) {
1082 size_t a, b;
1083
1084 path += strspn(path, "/");
1085 prefix += strspn(prefix, "/");
1086
1087 if (*prefix == 0)
1088 return true;
1089
1090 if (*path == 0)
1091 return false;
1092
1093 a = strcspn(path, "/");
1094 b = strcspn(prefix, "/");
1095
1096 if (a != b)
1097 return false;
1098
1099 if (memcmp(path, prefix, a) != 0)
1100 return false;
1101
1102 path += a;
1103 prefix += b;
1104 }
1105}
1106
67d51650 1107char *ascii_strlower(char *t) {
4fe88d28
LP		 1108 char *p;
1109
67d51650 1110 assert(t);
4fe88d28 1111
67d51650 1112 for (p = t; *p; p++)
4fe88d28
LP		 1113 if (*p >= 'A' && *p <= 'Z')
1114 *p = *p - 'A' + 'a';
1115
67d51650 1116 return t;
4fe88d28 1117}
1dccbe19 1118
c85dc17b
LP		 1119bool ignore_file(const char *filename) {
1120 assert(filename);
1121
1122 return
1123 filename[0] == '.' ||
1124 endswith(filename, "~") ||
1125 endswith(filename, ".rpmnew") ||
1126 endswith(filename, ".rpmsave") ||
1127 endswith(filename, ".rpmorig") ||
1128 endswith(filename, ".dpkg-old") ||
1129 endswith(filename, ".dpkg-new") ||
1130 endswith(filename, ".swp");
1131}
1132
3a0ecb08
LP		 1133int fd_nonblock(int fd, bool nonblock) {
1134 int flags;
1135
1136 assert(fd >= 0);
1137
1138 if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
1139 return -errno;
1140
1141 if (nonblock)
1142 flags |= O_NONBLOCK;
1143 else
1144 flags &= ~O_NONBLOCK;
1145
1146 if (fcntl(fd, F_SETFL, flags) < 0)
1147 return -errno;
1148
1149 return 0;
1150}
1151
1152int fd_cloexec(int fd, bool cloexec) {
1153 int flags;
1154
1155 assert(fd >= 0);
1156
1157 if ((flags = fcntl(fd, F_GETFD, 0)) < 0)
1158 return -errno;
1159
1160 if (cloexec)
1161 flags |= FD_CLOEXEC;
1162 else
1163 flags &= ~FD_CLOEXEC;
1164
1165 if (fcntl(fd, F_SETFD, flags) < 0)
1166 return -errno;
1167
1168 return 0;
1169}
1170
a0d40ac5
LP		 1171int close_all_fds(const int except[], unsigned n_except) {
1172 DIR *d;
1173 struct dirent *de;
1174 int r = 0;
1175
1176 if (!(d = opendir("/proc/self/fd")))
1177 return -errno;
1178
1179 while ((de = readdir(d))) {
a7610064 1180 int fd = -1;
a0d40ac5
LP		 1181
1182 if (de->d_name[0] == '.')
1183 continue;
1184
1185 if ((r = safe_atoi(de->d_name, &fd)) < 0)
1186 goto finish;
1187
1188 if (fd < 3)
1189 continue;
1190
1191 if (fd == dirfd(d))
1192 continue;
1193
1194 if (except) {
1195 bool found;
1196 unsigned i;
1197
1198 found = false;
1199 for (i = 0; i < n_except; i++)
1200 if (except[i] == fd) {
1201 found = true;
1202 break;
1203 }
1204
1205 if (found)
1206 continue;
1207 }
1208
2f357920
LP		 1209 if ((r = close_nointr(fd)) < 0) {
1210 /* Valgrind has its own FD and doesn't want to have it closed */
1211 if (errno != EBADF)
1212 goto finish;
1213 }
a0d40ac5
LP		 1214 }
1215
2f357920
LP		 1216 r = 0;
1217
a0d40ac5
LP		 1218finish:
1219 closedir(d);
1220 return r;
1221}
1222
db12775d
LP		 1223bool chars_intersect(const char *a, const char *b) {
1224 const char *p;
1225
1226 /* Returns true if any of the chars in a are in b. */
1227 for (p = a; *p; p++)
1228 if (strchr(b, *p))
1229 return true;
1230
1231 return false;
1232}
1233
1dccbe19
LP		 1234static const char *const ioprio_class_table[] = {
1235 [IOPRIO_CLASS_NONE] = "none",
1236 [IOPRIO_CLASS_RT] = "realtime",
1237 [IOPRIO_CLASS_BE] = "best-effort",
1238 [IOPRIO_CLASS_IDLE] = "idle"
1239};
1240
1241DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int);
1242
1243static const char *const sigchld_code_table[] = {
1244 [CLD_EXITED] = "exited",
1245 [CLD_KILLED] = "killed",
1246 [CLD_DUMPED] = "dumped",
1247 [CLD_TRAPPED] = "trapped",
1248 [CLD_STOPPED] = "stopped",
1249 [CLD_CONTINUED] = "continued",
1250};
1251
1252DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
1253
1254static const char *const log_facility_table[LOG_NFACILITIES] = {
1255 [LOG_FAC(LOG_KERN)] = "kern",
1256 [LOG_FAC(LOG_USER)] = "user",
1257 [LOG_FAC(LOG_MAIL)] = "mail",
1258 [LOG_FAC(LOG_DAEMON)] = "daemon",
1259 [LOG_FAC(LOG_AUTH)] = "auth",
1260 [LOG_FAC(LOG_SYSLOG)] = "syslog",
1261 [LOG_FAC(LOG_LPR)] = "lpr",
1262 [LOG_FAC(LOG_NEWS)] = "news",
1263 [LOG_FAC(LOG_UUCP)] = "uucp",
1264 [LOG_FAC(LOG_CRON)] = "cron",
1265 [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
1266 [LOG_FAC(LOG_FTP)] = "ftp",
1267 [LOG_FAC(LOG_LOCAL0)] = "local0",
1268 [LOG_FAC(LOG_LOCAL1)] = "local1",
1269 [LOG_FAC(LOG_LOCAL2)] = "local2",
1270 [LOG_FAC(LOG_LOCAL3)] = "local3",
1271 [LOG_FAC(LOG_LOCAL4)] = "local4",
1272 [LOG_FAC(LOG_LOCAL5)] = "local5",
1273 [LOG_FAC(LOG_LOCAL6)] = "local6",
1274 [LOG_FAC(LOG_LOCAL7)] = "local7"
1275};
1276
1277DEFINE_STRING_TABLE_LOOKUP(log_facility, int);
1278
1279static const char *const log_level_table[] = {
1280 [LOG_EMERG] = "emerg",
1281 [LOG_ALERT] = "alert",
1282 [LOG_CRIT] = "crit",
1283 [LOG_ERR] = "err",
1284 [LOG_WARNING] = "warning",
1285 [LOG_NOTICE] = "notice",
1286 [LOG_INFO] = "info",
1287 [LOG_DEBUG] = "debug"
1288};
1289
1290DEFINE_STRING_TABLE_LOOKUP(log_level, int);
1291
1292static const char* const sched_policy_table[] = {
1293 [SCHED_OTHER] = "other",
1294 [SCHED_BATCH] = "batch",
1295 [SCHED_IDLE] = "idle",
1296 [SCHED_FIFO] = "fifo",
1297 [SCHED_RR] = "rr"
1298};
1299
1300DEFINE_STRING_TABLE_LOOKUP(sched_policy, int);
1301
1302static const char* const rlimit_table[] = {
1303 [RLIMIT_CPU] = "LimitCPU",
1304 [RLIMIT_FSIZE] = "LimitFSIZE",
1305 [RLIMIT_DATA] = "LimitDATA",
1306 [RLIMIT_STACK] = "LimitSTACK",
1307 [RLIMIT_CORE] = "LimitCORE",
1308 [RLIMIT_RSS] = "LimitRSS",
1309 [RLIMIT_NOFILE] = "LimitNOFILE",
1310 [RLIMIT_AS] = "LimitAS",
1311 [RLIMIT_NPROC] = "LimitNPROC",
1312 [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
1313 [RLIMIT_LOCKS] = "LimitLOCKS",
1314 [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
1315 [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
1316 [RLIMIT_NICE] = "LimitNICE",
1317 [RLIMIT_RTPRIO] = "LimitRTPRIO",
1318 [RLIMIT_RTTIME] = "LimitRTTIME"
1319};
1320
1321DEFINE_STRING_TABLE_LOOKUP(rlimit, int);
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