1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
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.
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.
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/>.
31 #include <sys/resource.h>
32 #include <linux/sched.h>
39 usec_t now(clockid_t clock_id) {
42 assert_se(clock_gettime(clock_id, &ts) == 0);
44 return timespec_load(&ts);
47 usec_t timespec_load(const struct timespec *ts) {
51 (usec_t) ts->tv_sec * USEC_PER_SEC +
52 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
55 struct timespec *timespec_store(struct timespec *ts, usec_t u) {
58 ts->tv_sec = (time_t) (u / USEC_PER_SEC);
59 ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
64 usec_t timeval_load(const struct timeval *tv) {
68 (usec_t) tv->tv_sec * USEC_PER_SEC +
72 struct timeval *timeval_store(struct timeval *tv, usec_t u) {
75 tv->tv_sec = (time_t) (u / USEC_PER_SEC);
76 tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
81 bool endswith(const char *s, const char *postfix) {
93 return memcmp(s + sl - pl, postfix, pl) == 0;
96 bool startswith(const char *s, const char *prefix) {
108 return memcmp(s, prefix, pl) == 0;
111 bool first_word(const char *s, const char *word) {
123 if (memcmp(s, word, wl) != 0)
126 return (s[wl] == 0 ||
127 strchr(WHITESPACE, s[wl]));
130 int close_nointr(int fd) {
136 if ((r = close(fd)) >= 0)
144 void close_nointr_nofail(int fd) {
146 /* like close_nointr() but cannot fail, and guarantees errno
149 assert_se(close_nointr(fd) == 0);
152 int parse_boolean(const char *v) {
155 if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
157 else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
163 int safe_atou(const char *s, unsigned *ret_u) {
171 l = strtoul(s, &x, 0);
173 if (!x || *x || errno)
174 return errno ? -errno : -EINVAL;
176 if ((unsigned long) (unsigned) l != l)
179 *ret_u = (unsigned) l;
183 int safe_atoi(const char *s, int *ret_i) {
191 l = strtol(s, &x, 0);
193 if (!x || *x || errno)
194 return errno ? -errno : -EINVAL;
196 if ((long) (int) l != l)
203 int safe_atolu(const char *s, long unsigned *ret_lu) {
211 l = strtoul(s, &x, 0);
213 if (!x || *x || errno)
214 return errno ? -errno : -EINVAL;
220 int safe_atoli(const char *s, long int *ret_li) {
228 l = strtol(s, &x, 0);
230 if (!x || *x || errno)
231 return errno ? -errno : -EINVAL;
237 int safe_atollu(const char *s, long long unsigned *ret_llu) {
239 unsigned long long l;
245 l = strtoull(s, &x, 0);
247 if (!x || *x || errno)
248 return errno ? -errno : -EINVAL;
254 int safe_atolli(const char *s, long long int *ret_lli) {
262 l = strtoll(s, &x, 0);
264 if (!x || *x || errno)
265 return errno ? -errno : -EINVAL;
271 /* Split a string into words. */
272 char *split_spaces(const char *c, size_t *l, char **state) {
275 current = *state ? *state : (char*) c;
277 if (!*current || *c == 0)
280 current += strspn(current, WHITESPACE);
281 *l = strcspn(current, WHITESPACE);
284 return (char*) current;
287 /* Split a string into words, but consider strings enclosed in '' and
288 * "" as words even if they include spaces. */
289 char *split_quoted(const char *c, size_t *l, char **state) {
292 current = *state ? *state : (char*) c;
294 if (!*current || *c == 0)
297 current += strspn(current, WHITESPACE);
299 if (*current == '\'') {
301 *l = strcspn(current, "'");
306 } else if (*current == '\"') {
308 *l = strcspn(current, "\"");
314 *l = strcspn(current, WHITESPACE);
318 /* FIXME: Cannot deal with strings that have spaces AND ticks
321 return (char*) current;
324 int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
327 char fn[132], line[256], *p;
328 long long unsigned ppid;
333 assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%llu/stat", (unsigned long long) pid) < (int) (sizeof(fn)-1));
334 fn[sizeof(fn)-1] = 0;
336 if (!(f = fopen(fn, "r")))
339 if (!(fgets(line, sizeof(line), f))) {
347 /* Let's skip the pid and comm fields. The latter is enclosed
348 * in () but does not escape any () in its value, so let's
349 * skip over it manually */
351 if (!(p = strrchr(line, ')')))
362 if ((long long unsigned) (pid_t) ppid != ppid)
365 *_ppid = (pid_t) ppid;
370 int write_one_line_file(const char *fn, const char *line) {
377 if (!(f = fopen(fn, "we")))
380 if (fputs(line, f) < 0) {
391 int read_one_line_file(const char *fn, char **line) {
399 if (!(f = fopen(fn, "re")))
402 if (!(fgets(t, sizeof(t), f))) {
407 if (!(c = strdup(t))) {
420 char *strappend(const char *s, const char *suffix) {
430 if (!(r = new(char, a+b+1)))
434 memcpy(r+a, suffix, b);
440 int readlink_malloc(const char *p, char **r) {
450 if (!(c = new(char, l)))
453 if ((n = readlink(p, c, l-1)) < 0) {
459 if ((size_t) n < l-1) {
470 char *file_name_from_path(const char *p) {
475 if ((r = strrchr(p, '/')))
481 bool path_is_absolute(const char *p) {
487 bool is_path(const char *p) {
489 return !!strchr(p, '/');
492 char *path_make_absolute(const char *p, const char *prefix) {
497 if (path_is_absolute(p) || !prefix)
500 if (asprintf(&r, "%s/%s", prefix, p) < 0)
506 int reset_all_signal_handlers(void) {
509 for (sig = 1; sig < _NSIG; sig++) {
512 if (sig == SIGKILL || sig == SIGSTOP)
516 sa.sa_handler = SIG_DFL;
517 sa.sa_flags = SA_RESTART;
519 /* On Linux the first two RT signals are reserved by
520 * glibc, and sigaction() will return EINVAL for them. */
521 if ((sigaction(sig, &sa, NULL) < 0))
529 char *strstrip(char *s) {
532 /* Drops trailing whitespace. Modifies the string in
533 * place. Returns pointer to first non-space character */
535 s += strspn(s, WHITESPACE);
538 if (!strchr(WHITESPACE, *e))
550 char *file_in_same_dir(const char *path, const char *filename) {
557 /* This removes the last component of path and appends
558 * filename, unless the latter is absolute anyway or the
561 if (path_is_absolute(filename))
562 return strdup(filename);
564 if (!(e = strrchr(path, '/')))
565 return strdup(filename);
567 k = strlen(filename);
568 if (!(r = new(char, e-path+1+k+1)))
571 memcpy(r, path, e-path+1);
572 memcpy(r+(e-path)+1, filename, k+1);
577 char hexchar(int x) {
578 static const char table[16] = "0123456789abcdef";
580 return table[x & 15];
583 int unhexchar(char c) {
585 if (c >= '0' && c <= '9')
588 if (c >= 'a' && c <= 'f')
591 if (c >= 'A' && c <= 'F')
597 char octchar(int x) {
598 return '0' + (x & 7);
601 int unoctchar(char c) {
603 if (c >= '0' && c <= '7')
609 char *cescape(const char *s) {
615 /* Does C style string escaping. */
617 if (!(r = new(char, strlen(s)*4 + 1)))
620 for (f = s, t = r; *f; f++)
666 /* For special chars we prefer octal over
667 * hexadecimal encoding, simply because glib's
668 * g_strescape() does the same */
669 if ((*f < ' ') || (*f >= 127)) {
671 *(t++) = octchar((unsigned char) *f >> 6);
672 *(t++) = octchar((unsigned char) *f >> 3);
673 *(t++) = octchar((unsigned char) *f);
684 char *cunescape(const char *s) {
690 /* Undoes C style string escaping */
692 if (!(r = new(char, strlen(s)+1)))
695 for (f = s, t = r; *f; f++) {
738 /* hexadecimal encoding */
741 if ((a = unhexchar(f[1])) < 0 ||
742 (b = unhexchar(f[2])) < 0) {
743 /* Invalid escape code, let's take it literal then */
747 *(t++) = (char) ((a << 4) | b);
765 if ((a = unoctchar(f[0])) < 0 ||
766 (b = unoctchar(f[1])) < 0 ||
767 (c = unoctchar(f[2])) < 0) {
768 /* Invalid escape code, let's take it literal then */
772 *(t++) = (char) ((a << 6) | (b << 3) | c);
780 /* premature end of string.*/
785 /* Invalid escape code, let's take it literal then */
798 char *xescape(const char *s, const char *bad) {
802 /* Escapes all chars in bad, in addition to \ and all special
803 * chars, in \xFF style escaping. May be reversed with
806 if (!(r = new(char, strlen(s)*4+1)))
809 for (f = s, t = r; *f; f++) {
811 if (*f < ' ' || *f >= 127 ||
812 *f == '\\' || strchr(bad, *f)) {
815 *(t++) = hexchar(*f >> 4);
816 *(t++) = hexchar(*f);
826 char *bus_path_escape(const char *s) {
832 /* Escapes all chars that D-Bus' object path cannot deal
833 * with. Can be reverse with bus_path_unescape() */
835 if (!(r = new(char, strlen(s)*3+1)))
838 for (f = s, t = r; *f; f++) {
840 if (!(*f >= 'A' && *f <= 'Z') &&
841 !(*f >= 'a' && *f <= 'z') &&
842 !(*f >= '0' && *f <= '9')) {
844 *(t++) = hexchar(*f >> 4);
845 *(t++) = hexchar(*f);
855 char *bus_path_unescape(const char *s) {
861 if (!(r = new(char, strlen(s)+1)))
864 for (f = s, t = r; *f; f++) {
869 if ((a = unhexchar(f[1])) < 0 ||
870 (b = unhexchar(f[2])) < 0) {
871 /* Invalid escape code, let's take it literal then */
874 *(t++) = (char) ((a << 4) | b);
886 char *path_kill_slashes(char *path) {
890 /* Removes redundant inner and trailing slashes. Modifies the
891 * passed string in-place.
893 * ///foo///bar/ becomes /foo/bar
896 for (f = path, t = path; *f; f++) {
911 /* Special rule, if we are talking of the root directory, a
912 trailing slash is good */
914 if (t == path && slash)
921 bool path_startswith(const char *path, const char *prefix) {
925 if ((path[0] == '/') != (prefix[0] == '/'))
931 path += strspn(path, "/");
932 prefix += strspn(prefix, "/");
940 a = strcspn(path, "/");
941 b = strcspn(prefix, "/");
946 if (memcmp(path, prefix, a) != 0)
954 char *ascii_strlower(char *path) {
959 for (p = path; *p; p++)
960 if (*p >= 'A' && *p <= 'Z')
966 static const char *const ioprio_class_table[] = {
967 [IOPRIO_CLASS_NONE] = "none",
968 [IOPRIO_CLASS_RT] = "realtime",
969 [IOPRIO_CLASS_BE] = "best-effort",
970 [IOPRIO_CLASS_IDLE] = "idle"
973 DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int);
975 static const char *const sigchld_code_table[] = {
976 [CLD_EXITED] = "exited",
977 [CLD_KILLED] = "killed",
978 [CLD_DUMPED] = "dumped",
979 [CLD_TRAPPED] = "trapped",
980 [CLD_STOPPED] = "stopped",
981 [CLD_CONTINUED] = "continued",
984 DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
986 static const char *const log_facility_table[LOG_NFACILITIES] = {
987 [LOG_FAC(LOG_KERN)] = "kern",
988 [LOG_FAC(LOG_USER)] = "user",
989 [LOG_FAC(LOG_MAIL)] = "mail",
990 [LOG_FAC(LOG_DAEMON)] = "daemon",
991 [LOG_FAC(LOG_AUTH)] = "auth",
992 [LOG_FAC(LOG_SYSLOG)] = "syslog",
993 [LOG_FAC(LOG_LPR)] = "lpr",
994 [LOG_FAC(LOG_NEWS)] = "news",
995 [LOG_FAC(LOG_UUCP)] = "uucp",
996 [LOG_FAC(LOG_CRON)] = "cron",
997 [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
998 [LOG_FAC(LOG_FTP)] = "ftp",
999 [LOG_FAC(LOG_LOCAL0)] = "local0",
1000 [LOG_FAC(LOG_LOCAL1)] = "local1",
1001 [LOG_FAC(LOG_LOCAL2)] = "local2",
1002 [LOG_FAC(LOG_LOCAL3)] = "local3",
1003 [LOG_FAC(LOG_LOCAL4)] = "local4",
1004 [LOG_FAC(LOG_LOCAL5)] = "local5",
1005 [LOG_FAC(LOG_LOCAL6)] = "local6",
1006 [LOG_FAC(LOG_LOCAL7)] = "local7"
1009 DEFINE_STRING_TABLE_LOOKUP(log_facility, int);
1011 static const char *const log_level_table[] = {
1012 [LOG_EMERG] = "emerg",
1013 [LOG_ALERT] = "alert",
1014 [LOG_CRIT] = "crit",
1016 [LOG_WARNING] = "warning",
1017 [LOG_NOTICE] = "notice",
1018 [LOG_INFO] = "info",
1019 [LOG_DEBUG] = "debug"
1022 DEFINE_STRING_TABLE_LOOKUP(log_level, int);
1024 static const char* const sched_policy_table[] = {
1025 [SCHED_OTHER] = "other",
1026 [SCHED_BATCH] = "batch",
1027 [SCHED_IDLE] = "idle",
1028 [SCHED_FIFO] = "fifo",
1032 DEFINE_STRING_TABLE_LOOKUP(sched_policy, int);
1034 static const char* const rlimit_table[] = {
1035 [RLIMIT_CPU] = "LimitCPU",
1036 [RLIMIT_FSIZE] = "LimitFSIZE",
1037 [RLIMIT_DATA] = "LimitDATA",
1038 [RLIMIT_STACK] = "LimitSTACK",
1039 [RLIMIT_CORE] = "LimitCORE",
1040 [RLIMIT_RSS] = "LimitRSS",
1041 [RLIMIT_NOFILE] = "LimitNOFILE",
1042 [RLIMIT_AS] = "LimitAS",
1043 [RLIMIT_NPROC] = "LimitNPROC",
1044 [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
1045 [RLIMIT_LOCKS] = "LimitLOCKS",
1046 [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
1047 [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
1048 [RLIMIT_NICE] = "LimitNICE",
1049 [RLIMIT_RTPRIO] = "LimitRTPRIO",
1050 [RLIMIT_RTTIME] = "LimitRTTIME"
1053 DEFINE_STRING_TABLE_LOOKUP(rlimit, int);