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 bool streq_ptr(const char *a, const char *b) {
47 /* Like streq(), but tries to make sense of NULL pointers */
58 usec_t now(clockid_t clock_id) {
61 assert_se(clock_gettime(clock_id, &ts) == 0);
63 return timespec_load(&ts);
66 usec_t timespec_load(const struct timespec *ts) {
70 (usec_t) ts->tv_sec * USEC_PER_SEC +
71 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
74 struct timespec *timespec_store(struct timespec *ts, usec_t u) {
77 ts->tv_sec = (time_t) (u / USEC_PER_SEC);
78 ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
83 usec_t timeval_load(const struct timeval *tv) {
87 (usec_t) tv->tv_sec * USEC_PER_SEC +
91 struct timeval *timeval_store(struct timeval *tv, usec_t u) {
94 tv->tv_sec = (time_t) (u / USEC_PER_SEC);
95 tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
100 bool endswith(const char *s, const char *postfix) {
107 pl = strlen(postfix);
112 return memcmp(s + sl - pl, postfix, pl) == 0;
115 bool startswith(const char *s, const char *prefix) {
127 return memcmp(s, prefix, pl) == 0;
130 bool first_word(const char *s, const char *word) {
142 if (memcmp(s, word, wl) != 0)
145 return (s[wl] == 0 ||
146 strchr(WHITESPACE, s[wl]));
149 int close_nointr(int fd) {
155 if ((r = close(fd)) >= 0)
163 void close_nointr_nofail(int fd) {
165 /* like close_nointr() but cannot fail, and guarantees errno
168 assert_se(close_nointr(fd) == 0);
171 int parse_boolean(const char *v) {
174 if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
176 else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
182 int safe_atou(const char *s, unsigned *ret_u) {
190 l = strtoul(s, &x, 0);
192 if (!x || *x || errno)
193 return errno ? -errno : -EINVAL;
195 if ((unsigned long) (unsigned) l != l)
198 *ret_u = (unsigned) l;
202 int safe_atoi(const char *s, int *ret_i) {
210 l = strtol(s, &x, 0);
212 if (!x || *x || errno)
213 return errno ? -errno : -EINVAL;
215 if ((long) (int) l != l)
222 int safe_atolu(const char *s, long unsigned *ret_lu) {
230 l = strtoul(s, &x, 0);
232 if (!x || *x || errno)
233 return errno ? -errno : -EINVAL;
239 int safe_atoli(const char *s, long int *ret_li) {
247 l = strtol(s, &x, 0);
249 if (!x || *x || errno)
250 return errno ? -errno : -EINVAL;
256 int safe_atollu(const char *s, long long unsigned *ret_llu) {
258 unsigned long long l;
264 l = strtoull(s, &x, 0);
266 if (!x || *x || errno)
267 return errno ? -errno : -EINVAL;
273 int safe_atolli(const char *s, long long int *ret_lli) {
281 l = strtoll(s, &x, 0);
283 if (!x || *x || errno)
284 return errno ? -errno : -EINVAL;
290 /* Split a string into words. */
291 char *split(const char *c, size_t *l, const char *separator, char **state) {
294 current = *state ? *state : (char*) c;
296 if (!*current || *c == 0)
299 current += strspn(current, separator);
300 *l = strcspn(current, separator);
303 return (char*) current;
306 /* Split a string into words, but consider strings enclosed in '' and
307 * "" as words even if they include spaces. */
308 char *split_quoted(const char *c, size_t *l, char **state) {
311 current = *state ? *state : (char*) c;
313 if (!*current || *c == 0)
316 current += strspn(current, WHITESPACE);
318 if (*current == '\'') {
320 *l = strcspn(current, "'");
325 } else if (*current == '\"') {
327 *l = strcspn(current, "\"");
333 *l = strcspn(current, WHITESPACE);
337 /* FIXME: Cannot deal with strings that have spaces AND ticks
340 return (char*) current;
343 char **split_path_and_make_absolute(const char *p) {
347 if (!(l = strv_split(p, ":")))
350 if (!strv_path_make_absolute_cwd(l)) {
358 int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
361 char fn[132], line[256], *p;
362 long long unsigned ppid;
367 assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%llu/stat", (unsigned long long) pid) < (int) (sizeof(fn)-1));
368 fn[sizeof(fn)-1] = 0;
370 if (!(f = fopen(fn, "r")))
373 if (!(fgets(line, sizeof(line), f))) {
381 /* Let's skip the pid and comm fields. The latter is enclosed
382 * in () but does not escape any () in its value, so let's
383 * skip over it manually */
385 if (!(p = strrchr(line, ')')))
396 if ((long long unsigned) (pid_t) ppid != ppid)
399 *_ppid = (pid_t) ppid;
404 int write_one_line_file(const char *fn, const char *line) {
411 if (!(f = fopen(fn, "we")))
414 if (fputs(line, f) < 0) {
425 int read_one_line_file(const char *fn, char **line) {
433 if (!(f = fopen(fn, "re")))
436 if (!(fgets(t, sizeof(t), f))) {
441 if (!(c = strdup(t))) {
454 char *truncate_nl(char *s) {
457 s[strcspn(s, NEWLINE)] = 0;
461 int get_process_name(pid_t pid, char **name) {
468 if (asprintf(&p, "/proc/%llu/comm", (unsigned long long) pid) < 0)
471 r = read_one_line_file(p, name);
481 char *strappend(const char *s, const char *suffix) {
491 if (!(r = new(char, a+b+1)))
495 memcpy(r+a, suffix, b);
501 int readlink_malloc(const char *p, char **r) {
511 if (!(c = new(char, l)))
514 if ((n = readlink(p, c, l-1)) < 0) {
520 if ((size_t) n < l-1) {
531 char *file_name_from_path(const char *p) {
536 if ((r = strrchr(p, '/')))
542 bool path_is_absolute(const char *p) {
548 bool is_path(const char *p) {
550 return !!strchr(p, '/');
553 char *path_make_absolute(const char *p, const char *prefix) {
558 /* Makes every item in the list an absolute path by prepending
559 * the prefix, if specified and necessary */
561 if (path_is_absolute(p) || !prefix)
564 if (asprintf(&r, "%s/%s", prefix, p) < 0)
570 char *path_make_absolute_cwd(const char *p) {
575 /* Similar to path_make_absolute(), but prefixes with the
576 * current working directory. */
578 if (path_is_absolute(p))
581 if (!(cwd = get_current_dir_name()))
584 r = path_make_absolute(p, cwd);
590 char **strv_path_make_absolute_cwd(char **l) {
593 /* Goes through every item in the string list and makes it
594 * absolute. This works in place and won't rollback any
595 * changes on failure. */
600 if (!(t = path_make_absolute_cwd(*s)))
610 int reset_all_signal_handlers(void) {
613 for (sig = 1; sig < _NSIG; sig++) {
616 if (sig == SIGKILL || sig == SIGSTOP)
620 sa.sa_handler = SIG_DFL;
621 sa.sa_flags = SA_RESTART;
623 /* On Linux the first two RT signals are reserved by
624 * glibc, and sigaction() will return EINVAL for them. */
625 if ((sigaction(sig, &sa, NULL) < 0))
633 char *strstrip(char *s) {
636 /* Drops trailing whitespace. Modifies the string in
637 * place. Returns pointer to first non-space character */
639 s += strspn(s, WHITESPACE);
642 if (!strchr(WHITESPACE, *e))
654 char *delete_chars(char *s, const char *bad) {
657 /* Drops all whitespace, regardless where in the string */
659 for (f = s, t = s; *f; f++) {
671 char *file_in_same_dir(const char *path, const char *filename) {
678 /* This removes the last component of path and appends
679 * filename, unless the latter is absolute anyway or the
682 if (path_is_absolute(filename))
683 return strdup(filename);
685 if (!(e = strrchr(path, '/')))
686 return strdup(filename);
688 k = strlen(filename);
689 if (!(r = new(char, e-path+1+k+1)))
692 memcpy(r, path, e-path+1);
693 memcpy(r+(e-path)+1, filename, k+1);
698 int mkdir_parents(const char *path, mode_t mode) {
703 /* Creates every parent directory in the path except the last
706 p = path + strspn(path, "/");
711 e = p + strcspn(p, "/");
712 p = e + strspn(e, "/");
714 /* Is this the last component? If so, then we're
719 if (!(t = strndup(path, e - path)))
726 if (r < 0 && errno != EEXIST)
731 int mkdir_p(const char *path, mode_t mode) {
736 if ((r = mkdir_parents(path, mode)) < 0)
739 if (mkdir(path, mode) < 0)
745 char hexchar(int x) {
746 static const char table[16] = "0123456789abcdef";
748 return table[x & 15];
751 int unhexchar(char c) {
753 if (c >= '0' && c <= '9')
756 if (c >= 'a' && c <= 'f')
759 if (c >= 'A' && c <= 'F')
765 char octchar(int x) {
766 return '0' + (x & 7);
769 int unoctchar(char c) {
771 if (c >= '0' && c <= '7')
777 char decchar(int x) {
778 return '0' + (x % 10);
781 int undecchar(char c) {
783 if (c >= '0' && c <= '9')
789 char *cescape(const char *s) {
795 /* Does C style string escaping. */
797 if (!(r = new(char, strlen(s)*4 + 1)))
800 for (f = s, t = r; *f; f++)
846 /* For special chars we prefer octal over
847 * hexadecimal encoding, simply because glib's
848 * g_strescape() does the same */
849 if ((*f < ' ') || (*f >= 127)) {
851 *(t++) = octchar((unsigned char) *f >> 6);
852 *(t++) = octchar((unsigned char) *f >> 3);
853 *(t++) = octchar((unsigned char) *f);
864 char *cunescape(const char *s) {
870 /* Undoes C style string escaping */
872 if (!(r = new(char, strlen(s)+1)))
875 for (f = s, t = r; *f; f++) {
918 /* hexadecimal encoding */
921 if ((a = unhexchar(f[1])) < 0 ||
922 (b = unhexchar(f[2])) < 0) {
923 /* Invalid escape code, let's take it literal then */
927 *(t++) = (char) ((a << 4) | b);
945 if ((a = unoctchar(f[0])) < 0 ||
946 (b = unoctchar(f[1])) < 0 ||
947 (c = unoctchar(f[2])) < 0) {
948 /* Invalid escape code, let's take it literal then */
952 *(t++) = (char) ((a << 6) | (b << 3) | c);
960 /* premature end of string.*/
965 /* Invalid escape code, let's take it literal then */
978 char *xescape(const char *s, const char *bad) {
982 /* Escapes all chars in bad, in addition to \ and all special
983 * chars, in \xFF style escaping. May be reversed with
986 if (!(r = new(char, strlen(s)*4+1)))
989 for (f = s, t = r; *f; f++) {
991 if ((*f < ' ') || (*f >= 127) ||
992 (*f == '\\') || strchr(bad, *f)) {
995 *(t++) = hexchar(*f >> 4);
996 *(t++) = hexchar(*f);
1006 char *bus_path_escape(const char *s) {
1012 /* Escapes all chars that D-Bus' object path cannot deal
1013 * with. Can be reverse with bus_path_unescape() */
1015 if (!(r = new(char, strlen(s)*3+1)))
1018 for (f = s, t = r; *f; f++) {
1020 if (!(*f >= 'A' && *f <= 'Z') &&
1021 !(*f >= 'a' && *f <= 'z') &&
1022 !(*f >= '0' && *f <= '9')) {
1024 *(t++) = hexchar(*f >> 4);
1025 *(t++) = hexchar(*f);
1035 char *bus_path_unescape(const char *s) {
1041 if (!(r = new(char, strlen(s)+1)))
1044 for (f = s, t = r; *f; f++) {
1049 if ((a = unhexchar(f[1])) < 0 ||
1050 (b = unhexchar(f[2])) < 0) {
1051 /* Invalid escape code, let's take it literal then */
1054 *(t++) = (char) ((a << 4) | b);
1066 char *path_kill_slashes(char *path) {
1070 /* Removes redundant inner and trailing slashes. Modifies the
1071 * passed string in-place.
1073 * ///foo///bar/ becomes /foo/bar
1076 for (f = path, t = path; *f; f++) {
1091 /* Special rule, if we are talking of the root directory, a
1092 trailing slash is good */
1094 if (t == path && slash)
1101 bool path_startswith(const char *path, const char *prefix) {
1105 if ((path[0] == '/') != (prefix[0] == '/'))
1111 path += strspn(path, "/");
1112 prefix += strspn(prefix, "/");
1120 a = strcspn(path, "/");
1121 b = strcspn(prefix, "/");
1126 if (memcmp(path, prefix, a) != 0)
1134 char *ascii_strlower(char *t) {
1139 for (p = t; *p; p++)
1140 if (*p >= 'A' && *p <= 'Z')
1141 *p = *p - 'A' + 'a';
1146 bool ignore_file(const char *filename) {
1150 filename[0] == '.' ||
1151 endswith(filename, "~") ||
1152 endswith(filename, ".rpmnew") ||
1153 endswith(filename, ".rpmsave") ||
1154 endswith(filename, ".rpmorig") ||
1155 endswith(filename, ".dpkg-old") ||
1156 endswith(filename, ".dpkg-new") ||
1157 endswith(filename, ".swp");
1160 int fd_nonblock(int fd, bool nonblock) {
1165 if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
1169 flags |= O_NONBLOCK;
1171 flags &= ~O_NONBLOCK;
1173 if (fcntl(fd, F_SETFL, flags) < 0)
1179 int fd_cloexec(int fd, bool cloexec) {
1184 if ((flags = fcntl(fd, F_GETFD, 0)) < 0)
1188 flags |= FD_CLOEXEC;
1190 flags &= ~FD_CLOEXEC;
1192 if (fcntl(fd, F_SETFD, flags) < 0)
1198 int close_all_fds(const int except[], unsigned n_except) {
1203 if (!(d = opendir("/proc/self/fd")))
1206 while ((de = readdir(d))) {
1209 if (de->d_name[0] == '.')
1212 if ((r = safe_atoi(de->d_name, &fd)) < 0)
1226 for (i = 0; i < n_except; i++)
1227 if (except[i] == fd) {
1236 if ((r = close_nointr(fd)) < 0) {
1237 /* Valgrind has its own FD and doesn't want to have it closed */
1250 bool chars_intersect(const char *a, const char *b) {
1253 /* Returns true if any of the chars in a are in b. */
1254 for (p = a; *p; p++)
1261 char *format_timestamp(char *buf, size_t l, usec_t t) {
1271 sec = (time_t) t / USEC_PER_SEC;
1273 if (strftime(buf, l, "%a, %d %b %Y %H:%M:%S %z", localtime_r(&sec, &tm)) <= 0)
1279 bool fstype_is_network(const char *fstype) {
1280 static const char * const table[] = {
1290 for (i = 0; i < ELEMENTSOF(table); i++)
1291 if (streq(table[i], fstype))
1297 static const char *const ioprio_class_table[] = {
1298 [IOPRIO_CLASS_NONE] = "none",
1299 [IOPRIO_CLASS_RT] = "realtime",
1300 [IOPRIO_CLASS_BE] = "best-effort",
1301 [IOPRIO_CLASS_IDLE] = "idle"
1304 DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int);
1306 static const char *const sigchld_code_table[] = {
1307 [CLD_EXITED] = "exited",
1308 [CLD_KILLED] = "killed",
1309 [CLD_DUMPED] = "dumped",
1310 [CLD_TRAPPED] = "trapped",
1311 [CLD_STOPPED] = "stopped",
1312 [CLD_CONTINUED] = "continued",
1315 DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
1317 static const char *const log_facility_table[LOG_NFACILITIES] = {
1318 [LOG_FAC(LOG_KERN)] = "kern",
1319 [LOG_FAC(LOG_USER)] = "user",
1320 [LOG_FAC(LOG_MAIL)] = "mail",
1321 [LOG_FAC(LOG_DAEMON)] = "daemon",
1322 [LOG_FAC(LOG_AUTH)] = "auth",
1323 [LOG_FAC(LOG_SYSLOG)] = "syslog",
1324 [LOG_FAC(LOG_LPR)] = "lpr",
1325 [LOG_FAC(LOG_NEWS)] = "news",
1326 [LOG_FAC(LOG_UUCP)] = "uucp",
1327 [LOG_FAC(LOG_CRON)] = "cron",
1328 [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
1329 [LOG_FAC(LOG_FTP)] = "ftp",
1330 [LOG_FAC(LOG_LOCAL0)] = "local0",
1331 [LOG_FAC(LOG_LOCAL1)] = "local1",
1332 [LOG_FAC(LOG_LOCAL2)] = "local2",
1333 [LOG_FAC(LOG_LOCAL3)] = "local3",
1334 [LOG_FAC(LOG_LOCAL4)] = "local4",
1335 [LOG_FAC(LOG_LOCAL5)] = "local5",
1336 [LOG_FAC(LOG_LOCAL6)] = "local6",
1337 [LOG_FAC(LOG_LOCAL7)] = "local7"
1340 DEFINE_STRING_TABLE_LOOKUP(log_facility, int);
1342 static const char *const log_level_table[] = {
1343 [LOG_EMERG] = "emerg",
1344 [LOG_ALERT] = "alert",
1345 [LOG_CRIT] = "crit",
1347 [LOG_WARNING] = "warning",
1348 [LOG_NOTICE] = "notice",
1349 [LOG_INFO] = "info",
1350 [LOG_DEBUG] = "debug"
1353 DEFINE_STRING_TABLE_LOOKUP(log_level, int);
1355 static const char* const sched_policy_table[] = {
1356 [SCHED_OTHER] = "other",
1357 [SCHED_BATCH] = "batch",
1358 [SCHED_IDLE] = "idle",
1359 [SCHED_FIFO] = "fifo",
1363 DEFINE_STRING_TABLE_LOOKUP(sched_policy, int);
1365 static const char* const rlimit_table[] = {
1366 [RLIMIT_CPU] = "LimitCPU",
1367 [RLIMIT_FSIZE] = "LimitFSIZE",
1368 [RLIMIT_DATA] = "LimitDATA",
1369 [RLIMIT_STACK] = "LimitSTACK",
1370 [RLIMIT_CORE] = "LimitCORE",
1371 [RLIMIT_RSS] = "LimitRSS",
1372 [RLIMIT_NOFILE] = "LimitNOFILE",
1373 [RLIMIT_AS] = "LimitAS",
1374 [RLIMIT_NPROC] = "LimitNPROC",
1375 [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
1376 [RLIMIT_LOCKS] = "LimitLOCKS",
1377 [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
1378 [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
1379 [RLIMIT_NICE] = "LimitNICE",
1380 [RLIMIT_RTPRIO] = "LimitRTPRIO",
1381 [RLIMIT_RTTIME] = "LimitRTTIME"
1384 DEFINE_STRING_TABLE_LOOKUP(rlimit, int);