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git.ipfire.org Git - people/ms/systemd.git/blob - util.c
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>
44 usec_t
now(clockid_t clock_id
) {
47 assert_se(clock_gettime(clock_id
, &ts
) == 0);
49 return timespec_load(&ts
);
52 usec_t
timespec_load(const struct timespec
*ts
) {
56 (usec_t
) ts
->tv_sec
* USEC_PER_SEC
+
57 (usec_t
) ts
->tv_nsec
/ NSEC_PER_USEC
;
60 struct timespec
*timespec_store(struct timespec
*ts
, usec_t u
) {
63 ts
->tv_sec
= (time_t) (u
/ USEC_PER_SEC
);
64 ts
->tv_nsec
= (long int) ((u
% USEC_PER_SEC
) * NSEC_PER_USEC
);
69 usec_t
timeval_load(const struct timeval
*tv
) {
73 (usec_t
) tv
->tv_sec
* USEC_PER_SEC
+
77 struct timeval
*timeval_store(struct timeval
*tv
, usec_t u
) {
80 tv
->tv_sec
= (time_t) (u
/ USEC_PER_SEC
);
81 tv
->tv_usec
= (suseconds_t
) (u
% USEC_PER_SEC
);
86 bool endswith(const char *s
, const char *postfix
) {
98 return memcmp(s
+ sl
- pl
, postfix
, pl
) == 0;
101 bool startswith(const char *s
, const char *prefix
) {
113 return memcmp(s
, prefix
, pl
) == 0;
116 bool first_word(const char *s
, const char *word
) {
128 if (memcmp(s
, word
, wl
) != 0)
131 return (s
[wl
] == 0 ||
132 strchr(WHITESPACE
, s
[wl
]));
135 int close_nointr(int fd
) {
141 if ((r
= close(fd
)) >= 0)
149 void close_nointr_nofail(int fd
) {
151 /* like close_nointr() but cannot fail, and guarantees errno
154 assert_se(close_nointr(fd
) == 0);
157 int parse_boolean(const char *v
) {
160 if (streq(v
, "1") || v
[0] == 'y' || v
[0] == 'Y' || v
[0] == 't' || v
[0] == 'T' || !strcasecmp(v
, "on"))
162 else if (streq(v
, "0") || v
[0] == 'n' || v
[0] == 'N' || v
[0] == 'f' || v
[0] == 'F' || !strcasecmp(v
, "off"))
168 int safe_atou(const char *s
, unsigned *ret_u
) {
176 l
= strtoul(s
, &x
, 0);
178 if (!x
|| *x
|| errno
)
179 return errno
? -errno
: -EINVAL
;
181 if ((unsigned long) (unsigned) l
!= l
)
184 *ret_u
= (unsigned) l
;
188 int safe_atoi(const char *s
, int *ret_i
) {
196 l
= strtol(s
, &x
, 0);
198 if (!x
|| *x
|| errno
)
199 return errno
? -errno
: -EINVAL
;
201 if ((long) (int) l
!= l
)
208 int safe_atolu(const char *s
, long unsigned *ret_lu
) {
216 l
= strtoul(s
, &x
, 0);
218 if (!x
|| *x
|| errno
)
219 return errno
? -errno
: -EINVAL
;
225 int safe_atoli(const char *s
, long int *ret_li
) {
233 l
= strtol(s
, &x
, 0);
235 if (!x
|| *x
|| errno
)
236 return errno
? -errno
: -EINVAL
;
242 int safe_atollu(const char *s
, long long unsigned *ret_llu
) {
244 unsigned long long l
;
250 l
= strtoull(s
, &x
, 0);
252 if (!x
|| *x
|| errno
)
253 return errno
? -errno
: -EINVAL
;
259 int safe_atolli(const char *s
, long long int *ret_lli
) {
267 l
= strtoll(s
, &x
, 0);
269 if (!x
|| *x
|| errno
)
270 return errno
? -errno
: -EINVAL
;
276 /* Split a string into words. */
277 char *split(const char *c
, size_t *l
, const char *separator
, char **state
) {
280 current
= *state
? *state
: (char*) c
;
282 if (!*current
|| *c
== 0)
285 current
+= strspn(current
, separator
);
286 *l
= strcspn(current
, separator
);
289 return (char*) current
;
292 /* Split a string into words, but consider strings enclosed in '' and
293 * "" as words even if they include spaces. */
294 char *split_quoted(const char *c
, size_t *l
, char **state
) {
297 current
= *state
? *state
: (char*) c
;
299 if (!*current
|| *c
== 0)
302 current
+= strspn(current
, WHITESPACE
);
304 if (*current
== '\'') {
306 *l
= strcspn(current
, "'");
311 } else if (*current
== '\"') {
313 *l
= strcspn(current
, "\"");
319 *l
= strcspn(current
, WHITESPACE
);
323 /* FIXME: Cannot deal with strings that have spaces AND ticks
326 return (char*) current
;
329 char **split_path_and_make_absolute(const char *p
) {
333 if (!(l
= strv_split(p
, ":")))
336 if (!strv_path_make_absolute_cwd(l
)) {
344 int get_parent_of_pid(pid_t pid
, pid_t
*_ppid
) {
347 char fn
[132], line
[256], *p
;
348 long long unsigned ppid
;
353 assert_se(snprintf(fn
, sizeof(fn
)-1, "/proc/%llu/stat", (unsigned long long) pid
) < (int) (sizeof(fn
)-1));
354 fn
[sizeof(fn
)-1] = 0;
356 if (!(f
= fopen(fn
, "r")))
359 if (!(fgets(line
, sizeof(line
), f
))) {
367 /* Let's skip the pid and comm fields. The latter is enclosed
368 * in () but does not escape any () in its value, so let's
369 * skip over it manually */
371 if (!(p
= strrchr(line
, ')')))
382 if ((long long unsigned) (pid_t
) ppid
!= ppid
)
385 *_ppid
= (pid_t
) ppid
;
390 int write_one_line_file(const char *fn
, const char *line
) {
397 if (!(f
= fopen(fn
, "we")))
400 if (fputs(line
, f
) < 0) {
411 int read_one_line_file(const char *fn
, char **line
) {
419 if (!(f
= fopen(fn
, "re")))
422 if (!(fgets(t
, sizeof(t
), f
))) {
427 if (!(c
= strdup(t
))) {
440 char *strappend(const char *s
, const char *suffix
) {
450 if (!(r
= new(char, a
+b
+1)))
454 memcpy(r
+a
, suffix
, b
);
460 int readlink_malloc(const char *p
, char **r
) {
470 if (!(c
= new(char, l
)))
473 if ((n
= readlink(p
, c
, l
-1)) < 0) {
479 if ((size_t) n
< l
-1) {
490 char *file_name_from_path(const char *p
) {
495 if ((r
= strrchr(p
, '/')))
501 bool path_is_absolute(const char *p
) {
507 bool is_path(const char *p
) {
509 return !!strchr(p
, '/');
512 char *path_make_absolute(const char *p
, const char *prefix
) {
517 /* Makes every item in the list an absolute path by prepending
518 * the prefix, if specified and necessary */
520 if (path_is_absolute(p
) || !prefix
)
523 if (asprintf(&r
, "%s/%s", prefix
, p
) < 0)
529 char *path_make_absolute_cwd(const char *p
) {
534 /* Similar to path_make_absolute(), but prefixes with the
535 * current working directory. */
537 if (path_is_absolute(p
))
540 if (!(cwd
= get_current_dir_name()))
543 r
= path_make_absolute(p
, cwd
);
549 char **strv_path_make_absolute_cwd(char **l
) {
552 /* Goes through every item in the string list and makes it
553 * absolute. This works in place and won't rollback any
554 * changes on failure. */
559 if (!(t
= path_make_absolute_cwd(*s
)))
569 int reset_all_signal_handlers(void) {
572 for (sig
= 1; sig
< _NSIG
; sig
++) {
575 if (sig
== SIGKILL
|| sig
== SIGSTOP
)
579 sa
.sa_handler
= SIG_DFL
;
580 sa
.sa_flags
= SA_RESTART
;
582 /* On Linux the first two RT signals are reserved by
583 * glibc, and sigaction() will return EINVAL for them. */
584 if ((sigaction(sig
, &sa
, NULL
) < 0))
592 char *strstrip(char *s
) {
595 /* Drops trailing whitespace. Modifies the string in
596 * place. Returns pointer to first non-space character */
598 s
+= strspn(s
, WHITESPACE
);
601 if (!strchr(WHITESPACE
, *e
))
613 char *file_in_same_dir(const char *path
, const char *filename
) {
620 /* This removes the last component of path and appends
621 * filename, unless the latter is absolute anyway or the
624 if (path_is_absolute(filename
))
625 return strdup(filename
);
627 if (!(e
= strrchr(path
, '/')))
628 return strdup(filename
);
630 k
= strlen(filename
);
631 if (!(r
= new(char, e
-path
+1+k
+1)))
634 memcpy(r
, path
, e
-path
+1);
635 memcpy(r
+(e
-path
)+1, filename
, k
+1);
640 int mkdir_parents(const char *path
, mode_t mode
) {
645 /* Creates every parent directory in the path except the last
648 p
= path
+ strspn(path
, "/");
653 e
= p
+ strcspn(p
, "/");
654 p
= e
+ strspn(e
, "/");
656 /* Is this the last component? If so, then we're
661 if (!(t
= strndup(path
, e
- path
)))
668 if (r
< 0 && errno
!= EEXIST
)
673 char hexchar(int x
) {
674 static const char table
[16] = "0123456789abcdef";
676 return table
[x
& 15];
679 int unhexchar(char c
) {
681 if (c
>= '0' && c
<= '9')
684 if (c
>= 'a' && c
<= 'f')
687 if (c
>= 'A' && c
<= 'F')
693 char octchar(int x
) {
694 return '0' + (x
& 7);
697 int unoctchar(char c
) {
699 if (c
>= '0' && c
<= '7')
705 char decchar(int x
) {
706 return '0' + (x
% 10);
709 int undecchar(char c
) {
711 if (c
>= '0' && c
<= '9')
717 char *cescape(const char *s
) {
723 /* Does C style string escaping. */
725 if (!(r
= new(char, strlen(s
)*4 + 1)))
728 for (f
= s
, t
= r
; *f
; f
++)
774 /* For special chars we prefer octal over
775 * hexadecimal encoding, simply because glib's
776 * g_strescape() does the same */
777 if ((*f
< ' ') || (*f
>= 127)) {
779 *(t
++) = octchar((unsigned char) *f
>> 6);
780 *(t
++) = octchar((unsigned char) *f
>> 3);
781 *(t
++) = octchar((unsigned char) *f
);
792 char *cunescape(const char *s
) {
798 /* Undoes C style string escaping */
800 if (!(r
= new(char, strlen(s
)+1)))
803 for (f
= s
, t
= r
; *f
; f
++) {
846 /* hexadecimal encoding */
849 if ((a
= unhexchar(f
[1])) < 0 ||
850 (b
= unhexchar(f
[2])) < 0) {
851 /* Invalid escape code, let's take it literal then */
855 *(t
++) = (char) ((a
<< 4) | b
);
873 if ((a
= unoctchar(f
[0])) < 0 ||
874 (b
= unoctchar(f
[1])) < 0 ||
875 (c
= unoctchar(f
[2])) < 0) {
876 /* Invalid escape code, let's take it literal then */
880 *(t
++) = (char) ((a
<< 6) | (b
<< 3) | c
);
888 /* premature end of string.*/
893 /* Invalid escape code, let's take it literal then */
906 char *xescape(const char *s
, const char *bad
) {
910 /* Escapes all chars in bad, in addition to \ and all special
911 * chars, in \xFF style escaping. May be reversed with
914 if (!(r
= new(char, strlen(s
)*4+1)))
917 for (f
= s
, t
= r
; *f
; f
++) {
919 if ((*f
< ' ') || (*f
>= 127) ||
920 (*f
== '\\') || strchr(bad
, *f
)) {
923 *(t
++) = hexchar(*f
>> 4);
924 *(t
++) = hexchar(*f
);
934 char *bus_path_escape(const char *s
) {
940 /* Escapes all chars that D-Bus' object path cannot deal
941 * with. Can be reverse with bus_path_unescape() */
943 if (!(r
= new(char, strlen(s
)*3+1)))
946 for (f
= s
, t
= r
; *f
; f
++) {
948 if (!(*f
>= 'A' && *f
<= 'Z') &&
949 !(*f
>= 'a' && *f
<= 'z') &&
950 !(*f
>= '0' && *f
<= '9')) {
952 *(t
++) = hexchar(*f
>> 4);
953 *(t
++) = hexchar(*f
);
963 char *bus_path_unescape(const char *s
) {
969 if (!(r
= new(char, strlen(s
)+1)))
972 for (f
= s
, t
= r
; *f
; f
++) {
977 if ((a
= unhexchar(f
[1])) < 0 ||
978 (b
= unhexchar(f
[2])) < 0) {
979 /* Invalid escape code, let's take it literal then */
982 *(t
++) = (char) ((a
<< 4) | b
);
994 char *path_kill_slashes(char *path
) {
998 /* Removes redundant inner and trailing slashes. Modifies the
999 * passed string in-place.
1001 * ///foo///bar/ becomes /foo/bar
1004 for (f
= path
, t
= path
; *f
; f
++) {
1019 /* Special rule, if we are talking of the root directory, a
1020 trailing slash is good */
1022 if (t
== path
&& slash
)
1029 bool path_startswith(const char *path
, const char *prefix
) {
1033 if ((path
[0] == '/') != (prefix
[0] == '/'))
1039 path
+= strspn(path
, "/");
1040 prefix
+= strspn(prefix
, "/");
1048 a
= strcspn(path
, "/");
1049 b
= strcspn(prefix
, "/");
1054 if (memcmp(path
, prefix
, a
) != 0)
1062 char *ascii_strlower(char *t
) {
1067 for (p
= t
; *p
; p
++)
1068 if (*p
>= 'A' && *p
<= 'Z')
1069 *p
= *p
- 'A' + 'a';
1074 bool ignore_file(const char *filename
) {
1078 filename
[0] == '.' ||
1079 endswith(filename
, "~") ||
1080 endswith(filename
, ".rpmnew") ||
1081 endswith(filename
, ".rpmsave") ||
1082 endswith(filename
, ".rpmorig") ||
1083 endswith(filename
, ".dpkg-old") ||
1084 endswith(filename
, ".dpkg-new") ||
1085 endswith(filename
, ".swp");
1088 int fd_nonblock(int fd
, bool nonblock
) {
1093 if ((flags
= fcntl(fd
, F_GETFL
, 0)) < 0)
1097 flags
|= O_NONBLOCK
;
1099 flags
&= ~O_NONBLOCK
;
1101 if (fcntl(fd
, F_SETFL
, flags
) < 0)
1107 int fd_cloexec(int fd
, bool cloexec
) {
1112 if ((flags
= fcntl(fd
, F_GETFD
, 0)) < 0)
1116 flags
|= FD_CLOEXEC
;
1118 flags
&= ~FD_CLOEXEC
;
1120 if (fcntl(fd
, F_SETFD
, flags
) < 0)
1126 static const char *const ioprio_class_table
[] = {
1127 [IOPRIO_CLASS_NONE
] = "none",
1128 [IOPRIO_CLASS_RT
] = "realtime",
1129 [IOPRIO_CLASS_BE
] = "best-effort",
1130 [IOPRIO_CLASS_IDLE
] = "idle"
1133 DEFINE_STRING_TABLE_LOOKUP(ioprio_class
, int);
1135 static const char *const sigchld_code_table
[] = {
1136 [CLD_EXITED
] = "exited",
1137 [CLD_KILLED
] = "killed",
1138 [CLD_DUMPED
] = "dumped",
1139 [CLD_TRAPPED
] = "trapped",
1140 [CLD_STOPPED
] = "stopped",
1141 [CLD_CONTINUED
] = "continued",
1144 DEFINE_STRING_TABLE_LOOKUP(sigchld_code
, int);
1146 static const char *const log_facility_table
[LOG_NFACILITIES
] = {
1147 [LOG_FAC(LOG_KERN
)] = "kern",
1148 [LOG_FAC(LOG_USER
)] = "user",
1149 [LOG_FAC(LOG_MAIL
)] = "mail",
1150 [LOG_FAC(LOG_DAEMON
)] = "daemon",
1151 [LOG_FAC(LOG_AUTH
)] = "auth",
1152 [LOG_FAC(LOG_SYSLOG
)] = "syslog",
1153 [LOG_FAC(LOG_LPR
)] = "lpr",
1154 [LOG_FAC(LOG_NEWS
)] = "news",
1155 [LOG_FAC(LOG_UUCP
)] = "uucp",
1156 [LOG_FAC(LOG_CRON
)] = "cron",
1157 [LOG_FAC(LOG_AUTHPRIV
)] = "authpriv",
1158 [LOG_FAC(LOG_FTP
)] = "ftp",
1159 [LOG_FAC(LOG_LOCAL0
)] = "local0",
1160 [LOG_FAC(LOG_LOCAL1
)] = "local1",
1161 [LOG_FAC(LOG_LOCAL2
)] = "local2",
1162 [LOG_FAC(LOG_LOCAL3
)] = "local3",
1163 [LOG_FAC(LOG_LOCAL4
)] = "local4",
1164 [LOG_FAC(LOG_LOCAL5
)] = "local5",
1165 [LOG_FAC(LOG_LOCAL6
)] = "local6",
1166 [LOG_FAC(LOG_LOCAL7
)] = "local7"
1169 DEFINE_STRING_TABLE_LOOKUP(log_facility
, int);
1171 static const char *const log_level_table
[] = {
1172 [LOG_EMERG
] = "emerg",
1173 [LOG_ALERT
] = "alert",
1174 [LOG_CRIT
] = "crit",
1176 [LOG_WARNING
] = "warning",
1177 [LOG_NOTICE
] = "notice",
1178 [LOG_INFO
] = "info",
1179 [LOG_DEBUG
] = "debug"
1182 DEFINE_STRING_TABLE_LOOKUP(log_level
, int);
1184 static const char* const sched_policy_table
[] = {
1185 [SCHED_OTHER
] = "other",
1186 [SCHED_BATCH
] = "batch",
1187 [SCHED_IDLE
] = "idle",
1188 [SCHED_FIFO
] = "fifo",
1192 DEFINE_STRING_TABLE_LOOKUP(sched_policy
, int);
1194 static const char* const rlimit_table
[] = {
1195 [RLIMIT_CPU
] = "LimitCPU",
1196 [RLIMIT_FSIZE
] = "LimitFSIZE",
1197 [RLIMIT_DATA
] = "LimitDATA",
1198 [RLIMIT_STACK
] = "LimitSTACK",
1199 [RLIMIT_CORE
] = "LimitCORE",
1200 [RLIMIT_RSS
] = "LimitRSS",
1201 [RLIMIT_NOFILE
] = "LimitNOFILE",
1202 [RLIMIT_AS
] = "LimitAS",
1203 [RLIMIT_NPROC
] = "LimitNPROC",
1204 [RLIMIT_MEMLOCK
] = "LimitMEMLOCK",
1205 [RLIMIT_LOCKS
] = "LimitLOCKS",
1206 [RLIMIT_SIGPENDING
] = "LimitSIGPENDING",
1207 [RLIMIT_MSGQUEUE
] = "LimitMSGQUEUE",
1208 [RLIMIT_NICE
] = "LimitNICE",
1209 [RLIMIT_RTPRIO
] = "LimitRTPRIO",
1210 [RLIMIT_RTTIME
] = "LimitRTTIME"
1213 DEFINE_STRING_TABLE_LOOKUP(rlimit
, int);