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>
45 usec_t now(clockid_t clock_id) {
48 assert_se(clock_gettime(clock_id, &ts) == 0);
50 return timespec_load(&ts);
53 usec_t timespec_load(const struct timespec *ts) {
57 (usec_t) ts->tv_sec * USEC_PER_SEC +
58 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
61 struct timespec *timespec_store(struct timespec *ts, usec_t u) {
64 ts->tv_sec = (time_t) (u / USEC_PER_SEC);
65 ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
70 usec_t timeval_load(const struct timeval *tv) {
74 (usec_t) tv->tv_sec * USEC_PER_SEC +
78 struct timeval *timeval_store(struct timeval *tv, usec_t u) {
81 tv->tv_sec = (time_t) (u / USEC_PER_SEC);
82 tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
87 bool endswith(const char *s, const char *postfix) {
99 return memcmp(s + sl - pl, postfix, pl) == 0;
102 bool startswith(const char *s, const char *prefix) {
114 return memcmp(s, prefix, pl) == 0;
117 bool first_word(const char *s, const char *word) {
129 if (memcmp(s, word, wl) != 0)
132 return (s[wl] == 0 ||
133 strchr(WHITESPACE, s[wl]));
136 int close_nointr(int fd) {
142 if ((r = close(fd)) >= 0)
150 void close_nointr_nofail(int fd) {
152 /* like close_nointr() but cannot fail, and guarantees errno
155 assert_se(close_nointr(fd) == 0);
158 int parse_boolean(const char *v) {
161 if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
163 else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
169 int safe_atou(const char *s, unsigned *ret_u) {
177 l = strtoul(s, &x, 0);
179 if (!x || *x || errno)
180 return errno ? -errno : -EINVAL;
182 if ((unsigned long) (unsigned) l != l)
185 *ret_u = (unsigned) l;
189 int safe_atoi(const char *s, int *ret_i) {
197 l = strtol(s, &x, 0);
199 if (!x || *x || errno)
200 return errno ? -errno : -EINVAL;
202 if ((long) (int) l != l)
209 int safe_atolu(const char *s, long unsigned *ret_lu) {
217 l = strtoul(s, &x, 0);
219 if (!x || *x || errno)
220 return errno ? -errno : -EINVAL;
226 int safe_atoli(const char *s, long int *ret_li) {
234 l = strtol(s, &x, 0);
236 if (!x || *x || errno)
237 return errno ? -errno : -EINVAL;
243 int safe_atollu(const char *s, long long unsigned *ret_llu) {
245 unsigned long long l;
251 l = strtoull(s, &x, 0);
253 if (!x || *x || errno)
254 return errno ? -errno : -EINVAL;
260 int safe_atolli(const char *s, long long int *ret_lli) {
268 l = strtoll(s, &x, 0);
270 if (!x || *x || errno)
271 return errno ? -errno : -EINVAL;
277 /* Split a string into words. */
278 char *split(const char *c, size_t *l, const char *separator, char **state) {
281 current = *state ? *state : (char*) c;
283 if (!*current || *c == 0)
286 current += strspn(current, separator);
287 *l = strcspn(current, separator);
290 return (char*) current;
293 /* Split a string into words, but consider strings enclosed in '' and
294 * "" as words even if they include spaces. */
295 char *split_quoted(const char *c, size_t *l, char **state) {
298 current = *state ? *state : (char*) c;
300 if (!*current || *c == 0)
303 current += strspn(current, WHITESPACE);
305 if (*current == '\'') {
307 *l = strcspn(current, "'");
312 } else if (*current == '\"') {
314 *l = strcspn(current, "\"");
320 *l = strcspn(current, WHITESPACE);
324 /* FIXME: Cannot deal with strings that have spaces AND ticks
327 return (char*) current;
330 char **split_path_and_make_absolute(const char *p) {
334 if (!(l = strv_split(p, ":")))
337 if (!strv_path_make_absolute_cwd(l)) {
345 int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
348 char fn[132], line[256], *p;
349 long long unsigned ppid;
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;
357 if (!(f = fopen(fn, "r")))
360 if (!(fgets(line, sizeof(line), f))) {
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 */
372 if (!(p = strrchr(line, ')')))
383 if ((long long unsigned) (pid_t) ppid != ppid)
386 *_ppid = (pid_t) ppid;
391 int write_one_line_file(const char *fn, const char *line) {
398 if (!(f = fopen(fn, "we")))
401 if (fputs(line, f) < 0) {
412 int read_one_line_file(const char *fn, char **line) {
420 if (!(f = fopen(fn, "re")))
423 if (!(fgets(t, sizeof(t), f))) {
428 if (!(c = strdup(t))) {
441 char *strappend(const char *s, const char *suffix) {
451 if (!(r = new(char, a+b+1)))
455 memcpy(r+a, suffix, b);
461 int readlink_malloc(const char *p, char **r) {
471 if (!(c = new(char, l)))
474 if ((n = readlink(p, c, l-1)) < 0) {
480 if ((size_t) n < l-1) {
491 char *file_name_from_path(const char *p) {
496 if ((r = strrchr(p, '/')))
502 bool path_is_absolute(const char *p) {
508 bool is_path(const char *p) {
510 return !!strchr(p, '/');
513 char *path_make_absolute(const char *p, const char *prefix) {
518 /* Makes every item in the list an absolute path by prepending
519 * the prefix, if specified and necessary */
521 if (path_is_absolute(p) || !prefix)
524 if (asprintf(&r, "%s/%s", prefix, p) < 0)
530 char *path_make_absolute_cwd(const char *p) {
535 /* Similar to path_make_absolute(), but prefixes with the
536 * current working directory. */
538 if (path_is_absolute(p))
541 if (!(cwd = get_current_dir_name()))
544 r = path_make_absolute(p, cwd);
550 char **strv_path_make_absolute_cwd(char **l) {
553 /* Goes through every item in the string list and makes it
554 * absolute. This works in place and won't rollback any
555 * changes on failure. */
560 if (!(t = path_make_absolute_cwd(*s)))
570 int reset_all_signal_handlers(void) {
573 for (sig = 1; sig < _NSIG; sig++) {
576 if (sig == SIGKILL || sig == SIGSTOP)
580 sa.sa_handler = SIG_DFL;
581 sa.sa_flags = SA_RESTART;
583 /* On Linux the first two RT signals are reserved by
584 * glibc, and sigaction() will return EINVAL for them. */
585 if ((sigaction(sig, &sa, NULL) < 0))
593 char *strstrip(char *s) {
596 /* Drops trailing whitespace. Modifies the string in
597 * place. Returns pointer to first non-space character */
599 s += strspn(s, WHITESPACE);
602 if (!strchr(WHITESPACE, *e))
614 char *delete_chars(char *s, const char *bad) {
617 /* Drops all whitespace, regardless where in the string */
619 for (f = s, t = s; *f; f++) {
631 char *file_in_same_dir(const char *path, const char *filename) {
638 /* This removes the last component of path and appends
639 * filename, unless the latter is absolute anyway or the
642 if (path_is_absolute(filename))
643 return strdup(filename);
645 if (!(e = strrchr(path, '/')))
646 return strdup(filename);
648 k = strlen(filename);
649 if (!(r = new(char, e-path+1+k+1)))
652 memcpy(r, path, e-path+1);
653 memcpy(r+(e-path)+1, filename, k+1);
658 int mkdir_parents(const char *path, mode_t mode) {
663 /* Creates every parent directory in the path except the last
666 p = path + strspn(path, "/");
671 e = p + strcspn(p, "/");
672 p = e + strspn(e, "/");
674 /* Is this the last component? If so, then we're
679 if (!(t = strndup(path, e - path)))
686 if (r < 0 && errno != EEXIST)
691 char hexchar(int x) {
692 static const char table[16] = "0123456789abcdef";
694 return table[x & 15];
697 int unhexchar(char c) {
699 if (c >= '0' && c <= '9')
702 if (c >= 'a' && c <= 'f')
705 if (c >= 'A' && c <= 'F')
711 char octchar(int x) {
712 return '0' + (x & 7);
715 int unoctchar(char c) {
717 if (c >= '0' && c <= '7')
723 char decchar(int x) {
724 return '0' + (x % 10);
727 int undecchar(char c) {
729 if (c >= '0' && c <= '9')
735 char *cescape(const char *s) {
741 /* Does C style string escaping. */
743 if (!(r = new(char, strlen(s)*4 + 1)))
746 for (f = s, t = r; *f; f++)
792 /* For special chars we prefer octal over
793 * hexadecimal encoding, simply because glib's
794 * g_strescape() does the same */
795 if ((*f < ' ') || (*f >= 127)) {
797 *(t++) = octchar((unsigned char) *f >> 6);
798 *(t++) = octchar((unsigned char) *f >> 3);
799 *(t++) = octchar((unsigned char) *f);
810 char *cunescape(const char *s) {
816 /* Undoes C style string escaping */
818 if (!(r = new(char, strlen(s)+1)))
821 for (f = s, t = r; *f; f++) {
864 /* hexadecimal encoding */
867 if ((a = unhexchar(f[1])) < 0 ||
868 (b = unhexchar(f[2])) < 0) {
869 /* Invalid escape code, let's take it literal then */
873 *(t++) = (char) ((a << 4) | b);
891 if ((a = unoctchar(f[0])) < 0 ||
892 (b = unoctchar(f[1])) < 0 ||
893 (c = unoctchar(f[2])) < 0) {
894 /* Invalid escape code, let's take it literal then */
898 *(t++) = (char) ((a << 6) | (b << 3) | c);
906 /* premature end of string.*/
911 /* Invalid escape code, let's take it literal then */
924 char *xescape(const char *s, const char *bad) {
928 /* Escapes all chars in bad, in addition to \ and all special
929 * chars, in \xFF style escaping. May be reversed with
932 if (!(r = new(char, strlen(s)*4+1)))
935 for (f = s, t = r; *f; f++) {
937 if ((*f < ' ') || (*f >= 127) ||
938 (*f == '\\') || strchr(bad, *f)) {
941 *(t++) = hexchar(*f >> 4);
942 *(t++) = hexchar(*f);
952 char *bus_path_escape(const char *s) {
958 /* Escapes all chars that D-Bus' object path cannot deal
959 * with. Can be reverse with bus_path_unescape() */
961 if (!(r = new(char, strlen(s)*3+1)))
964 for (f = s, t = r; *f; f++) {
966 if (!(*f >= 'A' && *f <= 'Z') &&
967 !(*f >= 'a' && *f <= 'z') &&
968 !(*f >= '0' && *f <= '9')) {
970 *(t++) = hexchar(*f >> 4);
971 *(t++) = hexchar(*f);
981 char *bus_path_unescape(const char *s) {
987 if (!(r = new(char, strlen(s)+1)))
990 for (f = s, t = r; *f; f++) {
995 if ((a = unhexchar(f[1])) < 0 ||
996 (b = unhexchar(f[2])) < 0) {
997 /* Invalid escape code, let's take it literal then */
1000 *(t++) = (char) ((a << 4) | b);
1012 char *path_kill_slashes(char *path) {
1016 /* Removes redundant inner and trailing slashes. Modifies the
1017 * passed string in-place.
1019 * ///foo///bar/ becomes /foo/bar
1022 for (f = path, t = path; *f; f++) {
1037 /* Special rule, if we are talking of the root directory, a
1038 trailing slash is good */
1040 if (t == path && slash)
1047 bool path_startswith(const char *path, const char *prefix) {
1051 if ((path[0] == '/') != (prefix[0] == '/'))
1057 path += strspn(path, "/");
1058 prefix += strspn(prefix, "/");
1066 a = strcspn(path, "/");
1067 b = strcspn(prefix, "/");
1072 if (memcmp(path, prefix, a) != 0)
1080 char *ascii_strlower(char *t) {
1085 for (p = t; *p; p++)
1086 if (*p >= 'A' && *p <= 'Z')
1087 *p = *p - 'A' + 'a';
1092 bool ignore_file(const char *filename) {
1096 filename[0] == '.' ||
1097 endswith(filename, "~") ||
1098 endswith(filename, ".rpmnew") ||
1099 endswith(filename, ".rpmsave") ||
1100 endswith(filename, ".rpmorig") ||
1101 endswith(filename, ".dpkg-old") ||
1102 endswith(filename, ".dpkg-new") ||
1103 endswith(filename, ".swp");
1106 int fd_nonblock(int fd, bool nonblock) {
1111 if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
1115 flags |= O_NONBLOCK;
1117 flags &= ~O_NONBLOCK;
1119 if (fcntl(fd, F_SETFL, flags) < 0)
1125 int fd_cloexec(int fd, bool cloexec) {
1130 if ((flags = fcntl(fd, F_GETFD, 0)) < 0)
1134 flags |= FD_CLOEXEC;
1136 flags &= ~FD_CLOEXEC;
1138 if (fcntl(fd, F_SETFD, flags) < 0)
1144 int close_all_fds(const int except[], unsigned n_except) {
1149 if (!(d = opendir("/proc/self/fd")))
1152 while ((de = readdir(d))) {
1155 if (de->d_name[0] == '.')
1158 if ((r = safe_atoi(de->d_name, &fd)) < 0)
1172 for (i = 0; i < n_except; i++)
1173 if (except[i] == fd) {
1182 if ((r = close_nointr(fd)) < 0) {
1183 /* Valgrind has its own FD and doesn't want to have it closed */
1196 bool chars_intersect(const char *a, const char *b) {
1199 /* Returns true if any of the chars in a are in b. */
1200 for (p = a; *p; p++)
1207 static const char *const ioprio_class_table[] = {
1208 [IOPRIO_CLASS_NONE] = "none",
1209 [IOPRIO_CLASS_RT] = "realtime",
1210 [IOPRIO_CLASS_BE] = "best-effort",
1211 [IOPRIO_CLASS_IDLE] = "idle"
1214 DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int);
1216 static const char *const sigchld_code_table[] = {
1217 [CLD_EXITED] = "exited",
1218 [CLD_KILLED] = "killed",
1219 [CLD_DUMPED] = "dumped",
1220 [CLD_TRAPPED] = "trapped",
1221 [CLD_STOPPED] = "stopped",
1222 [CLD_CONTINUED] = "continued",
1225 DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
1227 static const char *const log_facility_table[LOG_NFACILITIES] = {
1228 [LOG_FAC(LOG_KERN)] = "kern",
1229 [LOG_FAC(LOG_USER)] = "user",
1230 [LOG_FAC(LOG_MAIL)] = "mail",
1231 [LOG_FAC(LOG_DAEMON)] = "daemon",
1232 [LOG_FAC(LOG_AUTH)] = "auth",
1233 [LOG_FAC(LOG_SYSLOG)] = "syslog",
1234 [LOG_FAC(LOG_LPR)] = "lpr",
1235 [LOG_FAC(LOG_NEWS)] = "news",
1236 [LOG_FAC(LOG_UUCP)] = "uucp",
1237 [LOG_FAC(LOG_CRON)] = "cron",
1238 [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
1239 [LOG_FAC(LOG_FTP)] = "ftp",
1240 [LOG_FAC(LOG_LOCAL0)] = "local0",
1241 [LOG_FAC(LOG_LOCAL1)] = "local1",
1242 [LOG_FAC(LOG_LOCAL2)] = "local2",
1243 [LOG_FAC(LOG_LOCAL3)] = "local3",
1244 [LOG_FAC(LOG_LOCAL4)] = "local4",
1245 [LOG_FAC(LOG_LOCAL5)] = "local5",
1246 [LOG_FAC(LOG_LOCAL6)] = "local6",
1247 [LOG_FAC(LOG_LOCAL7)] = "local7"
1250 DEFINE_STRING_TABLE_LOOKUP(log_facility, int);
1252 static const char *const log_level_table[] = {
1253 [LOG_EMERG] = "emerg",
1254 [LOG_ALERT] = "alert",
1255 [LOG_CRIT] = "crit",
1257 [LOG_WARNING] = "warning",
1258 [LOG_NOTICE] = "notice",
1259 [LOG_INFO] = "info",
1260 [LOG_DEBUG] = "debug"
1263 DEFINE_STRING_TABLE_LOOKUP(log_level, int);
1265 static const char* const sched_policy_table[] = {
1266 [SCHED_OTHER] = "other",
1267 [SCHED_BATCH] = "batch",
1268 [SCHED_IDLE] = "idle",
1269 [SCHED_FIFO] = "fifo",
1273 DEFINE_STRING_TABLE_LOOKUP(sched_policy, int);
1275 static const char* const rlimit_table[] = {
1276 [RLIMIT_CPU] = "LimitCPU",
1277 [RLIMIT_FSIZE] = "LimitFSIZE",
1278 [RLIMIT_DATA] = "LimitDATA",
1279 [RLIMIT_STACK] = "LimitSTACK",
1280 [RLIMIT_CORE] = "LimitCORE",
1281 [RLIMIT_RSS] = "LimitRSS",
1282 [RLIMIT_NOFILE] = "LimitNOFILE",
1283 [RLIMIT_AS] = "LimitAS",
1284 [RLIMIT_NPROC] = "LimitNPROC",
1285 [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
1286 [RLIMIT_LOCKS] = "LimitLOCKS",
1287 [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
1288 [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
1289 [RLIMIT_NICE] = "LimitNICE",
1290 [RLIMIT_RTPRIO] = "LimitRTPRIO",
1291 [RLIMIT_RTTIME] = "LimitRTTIME"
1294 DEFINE_STRING_TABLE_LOOKUP(rlimit, int);