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>
33 #include <sys/types.h>
43 usec_t now(clockid_t clock_id) {
46 assert_se(clock_gettime(clock_id, &ts) == 0);
48 return timespec_load(&ts);
51 usec_t timespec_load(const struct timespec *ts) {
55 (usec_t) ts->tv_sec * USEC_PER_SEC +
56 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
59 struct timespec *timespec_store(struct timespec *ts, usec_t u) {
62 ts->tv_sec = (time_t) (u / USEC_PER_SEC);
63 ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
68 usec_t timeval_load(const struct timeval *tv) {
72 (usec_t) tv->tv_sec * USEC_PER_SEC +
76 struct timeval *timeval_store(struct timeval *tv, usec_t u) {
79 tv->tv_sec = (time_t) (u / USEC_PER_SEC);
80 tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
85 bool endswith(const char *s, const char *postfix) {
97 return memcmp(s + sl - pl, postfix, pl) == 0;
100 bool startswith(const char *s, const char *prefix) {
112 return memcmp(s, prefix, pl) == 0;
115 bool first_word(const char *s, const char *word) {
127 if (memcmp(s, word, wl) != 0)
130 return (s[wl] == 0 ||
131 strchr(WHITESPACE, s[wl]));
134 int close_nointr(int fd) {
140 if ((r = close(fd)) >= 0)
148 void close_nointr_nofail(int fd) {
150 /* like close_nointr() but cannot fail, and guarantees errno
153 assert_se(close_nointr(fd) == 0);
156 int parse_boolean(const char *v) {
159 if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
161 else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
167 int safe_atou(const char *s, unsigned *ret_u) {
175 l = strtoul(s, &x, 0);
177 if (!x || *x || errno)
178 return errno ? -errno : -EINVAL;
180 if ((unsigned long) (unsigned) l != l)
183 *ret_u = (unsigned) l;
187 int safe_atoi(const char *s, int *ret_i) {
195 l = strtol(s, &x, 0);
197 if (!x || *x || errno)
198 return errno ? -errno : -EINVAL;
200 if ((long) (int) l != l)
207 int safe_atolu(const char *s, long unsigned *ret_lu) {
215 l = strtoul(s, &x, 0);
217 if (!x || *x || errno)
218 return errno ? -errno : -EINVAL;
224 int safe_atoli(const char *s, long int *ret_li) {
232 l = strtol(s, &x, 0);
234 if (!x || *x || errno)
235 return errno ? -errno : -EINVAL;
241 int safe_atollu(const char *s, long long unsigned *ret_llu) {
243 unsigned long long l;
249 l = strtoull(s, &x, 0);
251 if (!x || *x || errno)
252 return errno ? -errno : -EINVAL;
258 int safe_atolli(const char *s, long long int *ret_lli) {
266 l = strtoll(s, &x, 0);
268 if (!x || *x || errno)
269 return errno ? -errno : -EINVAL;
275 /* Split a string into words. */
276 char *split(const char *c, size_t *l, const char *separator, char **state) {
279 current = *state ? *state : (char*) c;
281 if (!*current || *c == 0)
284 current += strspn(current, separator);
285 *l = strcspn(current, separator);
288 return (char*) current;
291 /* Split a string into words, but consider strings enclosed in '' and
292 * "" as words even if they include spaces. */
293 char *split_quoted(const char *c, size_t *l, char **state) {
296 current = *state ? *state : (char*) c;
298 if (!*current || *c == 0)
301 current += strspn(current, WHITESPACE);
303 if (*current == '\'') {
305 *l = strcspn(current, "'");
310 } else if (*current == '\"') {
312 *l = strcspn(current, "\"");
318 *l = strcspn(current, WHITESPACE);
322 /* FIXME: Cannot deal with strings that have spaces AND ticks
325 return (char*) current;
328 char **split_path_and_make_absolute(const char *p) {
332 if (!(l = strv_split(p, ":")))
335 if (!strv_path_make_absolute_cwd(l)) {
343 int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
346 char fn[132], line[256], *p;
347 long long unsigned ppid;
352 assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%llu/stat", (unsigned long long) pid) < (int) (sizeof(fn)-1));
353 fn[sizeof(fn)-1] = 0;
355 if (!(f = fopen(fn, "r")))
358 if (!(fgets(line, sizeof(line), f))) {
366 /* Let's skip the pid and comm fields. The latter is enclosed
367 * in () but does not escape any () in its value, so let's
368 * skip over it manually */
370 if (!(p = strrchr(line, ')')))
381 if ((long long unsigned) (pid_t) ppid != ppid)
384 *_ppid = (pid_t) ppid;
389 int write_one_line_file(const char *fn, const char *line) {
396 if (!(f = fopen(fn, "we")))
399 if (fputs(line, f) < 0) {
410 int read_one_line_file(const char *fn, char **line) {
418 if (!(f = fopen(fn, "re")))
421 if (!(fgets(t, sizeof(t), f))) {
426 if (!(c = strdup(t))) {
439 char *strappend(const char *s, const char *suffix) {
449 if (!(r = new(char, a+b+1)))
453 memcpy(r+a, suffix, b);
459 int readlink_malloc(const char *p, char **r) {
469 if (!(c = new(char, l)))
472 if ((n = readlink(p, c, l-1)) < 0) {
478 if ((size_t) n < l-1) {
489 char *file_name_from_path(const char *p) {
494 if ((r = strrchr(p, '/')))
500 bool path_is_absolute(const char *p) {
506 bool is_path(const char *p) {
508 return !!strchr(p, '/');
511 char *path_make_absolute(const char *p, const char *prefix) {
516 /* Makes every item in the list an absolute path by prepending
517 * the prefix, if specified and necessary */
519 if (path_is_absolute(p) || !prefix)
522 if (asprintf(&r, "%s/%s", prefix, p) < 0)
528 char *path_make_absolute_cwd(const char *p) {
533 /* Similar to path_make_absolute(), but prefixes with the
534 * current working directory. */
536 if (path_is_absolute(p))
539 if (!(cwd = get_current_dir_name()))
542 r = path_make_absolute(p, cwd);
548 char **strv_path_make_absolute_cwd(char **l) {
551 /* Goes through every item in the string list and makes it
552 * absolute. This works in place and won't rollback any
553 * changes on failure. */
558 if (!(t = path_make_absolute_cwd(*s)))
568 int reset_all_signal_handlers(void) {
571 for (sig = 1; sig < _NSIG; sig++) {
574 if (sig == SIGKILL || sig == SIGSTOP)
578 sa.sa_handler = SIG_DFL;
579 sa.sa_flags = SA_RESTART;
581 /* On Linux the first two RT signals are reserved by
582 * glibc, and sigaction() will return EINVAL for them. */
583 if ((sigaction(sig, &sa, NULL) < 0))
591 char *strstrip(char *s) {
594 /* Drops trailing whitespace. Modifies the string in
595 * place. Returns pointer to first non-space character */
597 s += strspn(s, WHITESPACE);
600 if (!strchr(WHITESPACE, *e))
612 char *file_in_same_dir(const char *path, const char *filename) {
619 /* This removes the last component of path and appends
620 * filename, unless the latter is absolute anyway or the
623 if (path_is_absolute(filename))
624 return strdup(filename);
626 if (!(e = strrchr(path, '/')))
627 return strdup(filename);
629 k = strlen(filename);
630 if (!(r = new(char, e-path+1+k+1)))
633 memcpy(r, path, e-path+1);
634 memcpy(r+(e-path)+1, filename, k+1);
639 int mkdir_parents(const char *path, mode_t mode) {
644 /* Creates every parent directory in the path except the last
647 p = path + strspn(path, "/");
652 e = p + strcspn(p, "/");
653 p = e + strspn(e, "/");
655 /* Is this the last component? If so, then we're
660 if (!(t = strndup(path, e - path)))
667 if (r < 0 && errno != EEXIST)
672 char hexchar(int x) {
673 static const char table[16] = "0123456789abcdef";
675 return table[x & 15];
678 int unhexchar(char c) {
680 if (c >= '0' && c <= '9')
683 if (c >= 'a' && c <= 'f')
686 if (c >= 'A' && c <= 'F')
692 char octchar(int x) {
693 return '0' + (x & 7);
696 int unoctchar(char c) {
698 if (c >= '0' && c <= '7')
704 char *cescape(const char *s) {
710 /* Does C style string escaping. */
712 if (!(r = new(char, strlen(s)*4 + 1)))
715 for (f = s, t = r; *f; f++)
761 /* For special chars we prefer octal over
762 * hexadecimal encoding, simply because glib's
763 * g_strescape() does the same */
764 if ((*f < ' ') || (*f >= 127)) {
766 *(t++) = octchar((unsigned char) *f >> 6);
767 *(t++) = octchar((unsigned char) *f >> 3);
768 *(t++) = octchar((unsigned char) *f);
779 char *cunescape(const char *s) {
785 /* Undoes C style string escaping */
787 if (!(r = new(char, strlen(s)+1)))
790 for (f = s, t = r; *f; f++) {
833 /* hexadecimal encoding */
836 if ((a = unhexchar(f[1])) < 0 ||
837 (b = unhexchar(f[2])) < 0) {
838 /* Invalid escape code, let's take it literal then */
842 *(t++) = (char) ((a << 4) | b);
860 if ((a = unoctchar(f[0])) < 0 ||
861 (b = unoctchar(f[1])) < 0 ||
862 (c = unoctchar(f[2])) < 0) {
863 /* Invalid escape code, let's take it literal then */
867 *(t++) = (char) ((a << 6) | (b << 3) | c);
875 /* premature end of string.*/
880 /* Invalid escape code, let's take it literal then */
893 char *xescape(const char *s, const char *bad) {
897 /* Escapes all chars in bad, in addition to \ and all special
898 * chars, in \xFF style escaping. May be reversed with
901 if (!(r = new(char, strlen(s)*4+1)))
904 for (f = s, t = r; *f; f++) {
906 if ((*f < ' ') || (*f >= 127) ||
907 (*f == '\\') || strchr(bad, *f)) {
910 *(t++) = hexchar(*f >> 4);
911 *(t++) = hexchar(*f);
921 char *bus_path_escape(const char *s) {
927 /* Escapes all chars that D-Bus' object path cannot deal
928 * with. Can be reverse with bus_path_unescape() */
930 if (!(r = new(char, strlen(s)*3+1)))
933 for (f = s, t = r; *f; f++) {
935 if (!(*f >= 'A' && *f <= 'Z') &&
936 !(*f >= 'a' && *f <= 'z') &&
937 !(*f >= '0' && *f <= '9')) {
939 *(t++) = hexchar(*f >> 4);
940 *(t++) = hexchar(*f);
950 char *bus_path_unescape(const char *s) {
956 if (!(r = new(char, strlen(s)+1)))
959 for (f = s, t = r; *f; f++) {
964 if ((a = unhexchar(f[1])) < 0 ||
965 (b = unhexchar(f[2])) < 0) {
966 /* Invalid escape code, let's take it literal then */
969 *(t++) = (char) ((a << 4) | b);
981 char *path_kill_slashes(char *path) {
985 /* Removes redundant inner and trailing slashes. Modifies the
986 * passed string in-place.
988 * ///foo///bar/ becomes /foo/bar
991 for (f = path, t = path; *f; f++) {
1006 /* Special rule, if we are talking of the root directory, a
1007 trailing slash is good */
1009 if (t == path && slash)
1016 bool path_startswith(const char *path, const char *prefix) {
1020 if ((path[0] == '/') != (prefix[0] == '/'))
1026 path += strspn(path, "/");
1027 prefix += strspn(prefix, "/");
1035 a = strcspn(path, "/");
1036 b = strcspn(prefix, "/");
1041 if (memcmp(path, prefix, a) != 0)
1049 char *ascii_strlower(char *path) {
1054 for (p = path; *p; p++)
1055 if (*p >= 'A' && *p <= 'Z')
1056 *p = *p - 'A' + 'a';
1061 bool ignore_file(const char *filename) {
1065 filename[0] == '.' ||
1066 endswith(filename, "~") ||
1067 endswith(filename, ".rpmnew") ||
1068 endswith(filename, ".rpmsave") ||
1069 endswith(filename, ".rpmorig") ||
1070 endswith(filename, ".dpkg-old") ||
1071 endswith(filename, ".dpkg-new") ||
1072 endswith(filename, ".swp");
1075 static const char *const ioprio_class_table[] = {
1076 [IOPRIO_CLASS_NONE] = "none",
1077 [IOPRIO_CLASS_RT] = "realtime",
1078 [IOPRIO_CLASS_BE] = "best-effort",
1079 [IOPRIO_CLASS_IDLE] = "idle"
1082 DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int);
1084 static const char *const sigchld_code_table[] = {
1085 [CLD_EXITED] = "exited",
1086 [CLD_KILLED] = "killed",
1087 [CLD_DUMPED] = "dumped",
1088 [CLD_TRAPPED] = "trapped",
1089 [CLD_STOPPED] = "stopped",
1090 [CLD_CONTINUED] = "continued",
1093 DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
1095 static const char *const log_facility_table[LOG_NFACILITIES] = {
1096 [LOG_FAC(LOG_KERN)] = "kern",
1097 [LOG_FAC(LOG_USER)] = "user",
1098 [LOG_FAC(LOG_MAIL)] = "mail",
1099 [LOG_FAC(LOG_DAEMON)] = "daemon",
1100 [LOG_FAC(LOG_AUTH)] = "auth",
1101 [LOG_FAC(LOG_SYSLOG)] = "syslog",
1102 [LOG_FAC(LOG_LPR)] = "lpr",
1103 [LOG_FAC(LOG_NEWS)] = "news",
1104 [LOG_FAC(LOG_UUCP)] = "uucp",
1105 [LOG_FAC(LOG_CRON)] = "cron",
1106 [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
1107 [LOG_FAC(LOG_FTP)] = "ftp",
1108 [LOG_FAC(LOG_LOCAL0)] = "local0",
1109 [LOG_FAC(LOG_LOCAL1)] = "local1",
1110 [LOG_FAC(LOG_LOCAL2)] = "local2",
1111 [LOG_FAC(LOG_LOCAL3)] = "local3",
1112 [LOG_FAC(LOG_LOCAL4)] = "local4",
1113 [LOG_FAC(LOG_LOCAL5)] = "local5",
1114 [LOG_FAC(LOG_LOCAL6)] = "local6",
1115 [LOG_FAC(LOG_LOCAL7)] = "local7"
1118 DEFINE_STRING_TABLE_LOOKUP(log_facility, int);
1120 static const char *const log_level_table[] = {
1121 [LOG_EMERG] = "emerg",
1122 [LOG_ALERT] = "alert",
1123 [LOG_CRIT] = "crit",
1125 [LOG_WARNING] = "warning",
1126 [LOG_NOTICE] = "notice",
1127 [LOG_INFO] = "info",
1128 [LOG_DEBUG] = "debug"
1131 DEFINE_STRING_TABLE_LOOKUP(log_level, int);
1133 static const char* const sched_policy_table[] = {
1134 [SCHED_OTHER] = "other",
1135 [SCHED_BATCH] = "batch",
1136 [SCHED_IDLE] = "idle",
1137 [SCHED_FIFO] = "fifo",
1141 DEFINE_STRING_TABLE_LOOKUP(sched_policy, int);
1143 static const char* const rlimit_table[] = {
1144 [RLIMIT_CPU] = "LimitCPU",
1145 [RLIMIT_FSIZE] = "LimitFSIZE",
1146 [RLIMIT_DATA] = "LimitDATA",
1147 [RLIMIT_STACK] = "LimitSTACK",
1148 [RLIMIT_CORE] = "LimitCORE",
1149 [RLIMIT_RSS] = "LimitRSS",
1150 [RLIMIT_NOFILE] = "LimitNOFILE",
1151 [RLIMIT_AS] = "LimitAS",
1152 [RLIMIT_NPROC] = "LimitNPROC",
1153 [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
1154 [RLIMIT_LOCKS] = "LimitLOCKS",
1155 [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
1156 [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
1157 [RLIMIT_NICE] = "LimitNICE",
1158 [RLIMIT_RTPRIO] = "LimitRTPRIO",
1159 [RLIMIT_RTTIME] = "LimitRTTIME"
1162 DEFINE_STRING_TABLE_LOOKUP(rlimit, int);