]>
git.ipfire.org Git - thirdparty/systemd.git/blob - src/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>
37 #include <sys/ioctl.h>
39 #include <linux/tiocl.h>
42 #include <sys/inotify.h>
46 #include <sys/prctl.h>
55 bool streq_ptr(const char *a
, const char *b
) {
57 /* Like streq(), but tries to make sense of NULL pointers */
68 usec_t
now(clockid_t clock_id
) {
71 assert_se(clock_gettime(clock_id
, &ts
) == 0);
73 return timespec_load(&ts
);
76 timestamp
* timestamp_get(timestamp
*ts
) {
79 ts
->realtime
= now(CLOCK_REALTIME
);
80 ts
->monotonic
= now(CLOCK_MONOTONIC
);
85 usec_t
timespec_load(const struct timespec
*ts
) {
89 (usec_t
) ts
->tv_sec
* USEC_PER_SEC
+
90 (usec_t
) ts
->tv_nsec
/ NSEC_PER_USEC
;
93 struct timespec
*timespec_store(struct timespec
*ts
, usec_t u
) {
96 ts
->tv_sec
= (time_t) (u
/ USEC_PER_SEC
);
97 ts
->tv_nsec
= (long int) ((u
% USEC_PER_SEC
) * NSEC_PER_USEC
);
102 usec_t
timeval_load(const struct timeval
*tv
) {
106 (usec_t
) tv
->tv_sec
* USEC_PER_SEC
+
107 (usec_t
) tv
->tv_usec
;
110 struct timeval
*timeval_store(struct timeval
*tv
, usec_t u
) {
113 tv
->tv_sec
= (time_t) (u
/ USEC_PER_SEC
);
114 tv
->tv_usec
= (suseconds_t
) (u
% USEC_PER_SEC
);
119 bool endswith(const char *s
, const char *postfix
) {
126 pl
= strlen(postfix
);
134 return memcmp(s
+ sl
- pl
, postfix
, pl
) == 0;
137 bool startswith(const char *s
, const char *prefix
) {
152 return memcmp(s
, prefix
, pl
) == 0;
155 bool startswith_no_case(const char *s
, const char *prefix
) {
171 for(i
= 0; i
< pl
; ++i
) {
172 if (tolower(s
[i
]) != tolower(prefix
[i
]))
179 bool first_word(const char *s
, const char *word
) {
194 if (memcmp(s
, word
, wl
) != 0)
198 strchr(WHITESPACE
, s
[wl
]);
201 int close_nointr(int fd
) {
207 if ((r
= close(fd
)) >= 0)
215 void close_nointr_nofail(int fd
) {
216 int saved_errno
= errno
;
218 /* like close_nointr() but cannot fail, and guarantees errno
221 assert_se(close_nointr(fd
) == 0);
226 void close_many(const int fds
[], unsigned n_fd
) {
229 for (i
= 0; i
< n_fd
; i
++)
230 close_nointr_nofail(fds
[i
]);
233 int parse_boolean(const char *v
) {
236 if (streq(v
, "1") || v
[0] == 'y' || v
[0] == 'Y' || v
[0] == 't' || v
[0] == 'T' || !strcasecmp(v
, "on"))
238 else if (streq(v
, "0") || v
[0] == 'n' || v
[0] == 'N' || v
[0] == 'f' || v
[0] == 'F' || !strcasecmp(v
, "off"))
244 int parse_pid(const char *s
, pid_t
* ret_pid
) {
252 if ((r
= safe_atolu(s
, &ul
)) < 0)
257 if ((unsigned long) pid
!= ul
)
267 int safe_atou(const char *s
, unsigned *ret_u
) {
275 l
= strtoul(s
, &x
, 0);
277 if (!x
|| *x
|| errno
)
278 return errno
? -errno
: -EINVAL
;
280 if ((unsigned long) (unsigned) l
!= l
)
283 *ret_u
= (unsigned) l
;
287 int safe_atoi(const char *s
, int *ret_i
) {
295 l
= strtol(s
, &x
, 0);
297 if (!x
|| *x
|| errno
)
298 return errno
? -errno
: -EINVAL
;
300 if ((long) (int) l
!= l
)
307 int safe_atolu(const char *s
, long unsigned *ret_lu
) {
315 l
= strtoul(s
, &x
, 0);
317 if (!x
|| *x
|| errno
)
318 return errno
? -errno
: -EINVAL
;
324 int safe_atoli(const char *s
, long int *ret_li
) {
332 l
= strtol(s
, &x
, 0);
334 if (!x
|| *x
|| errno
)
335 return errno
? -errno
: -EINVAL
;
341 int safe_atollu(const char *s
, long long unsigned *ret_llu
) {
343 unsigned long long l
;
349 l
= strtoull(s
, &x
, 0);
351 if (!x
|| *x
|| errno
)
352 return errno
? -errno
: -EINVAL
;
358 int safe_atolli(const char *s
, long long int *ret_lli
) {
366 l
= strtoll(s
, &x
, 0);
368 if (!x
|| *x
|| errno
)
369 return errno
? -errno
: -EINVAL
;
375 /* Split a string into words. */
376 char *split(const char *c
, size_t *l
, const char *separator
, char **state
) {
379 current
= *state
? *state
: (char*) c
;
381 if (!*current
|| *c
== 0)
384 current
+= strspn(current
, separator
);
385 *l
= strcspn(current
, separator
);
388 return (char*) current
;
391 /* Split a string into words, but consider strings enclosed in '' and
392 * "" as words even if they include spaces. */
393 char *split_quoted(const char *c
, size_t *l
, char **state
) {
396 current
= *state
? *state
: (char*) c
;
398 if (!*current
|| *c
== 0)
401 current
+= strspn(current
, WHITESPACE
);
403 if (*current
== '\'') {
405 *l
= strcspn(current
, "'");
410 } else if (*current
== '\"') {
412 *l
= strcspn(current
, "\"");
418 *l
= strcspn(current
, WHITESPACE
);
422 /* FIXME: Cannot deal with strings that have spaces AND ticks
425 return (char*) current
;
428 char **split_path_and_make_absolute(const char *p
) {
432 if (!(l
= strv_split(p
, ":")))
435 if (!strv_path_make_absolute_cwd(l
)) {
443 int get_parent_of_pid(pid_t pid
, pid_t
*_ppid
) {
446 char fn
[132], line
[256], *p
;
447 long long unsigned ppid
;
452 assert_se(snprintf(fn
, sizeof(fn
)-1, "/proc/%llu/stat", (unsigned long long) pid
) < (int) (sizeof(fn
)-1));
453 fn
[sizeof(fn
)-1] = 0;
455 if (!(f
= fopen(fn
, "r")))
458 if (!(fgets(line
, sizeof(line
), f
))) {
466 /* Let's skip the pid and comm fields. The latter is enclosed
467 * in () but does not escape any () in its value, so let's
468 * skip over it manually */
470 if (!(p
= strrchr(line
, ')')))
481 if ((long long unsigned) (pid_t
) ppid
!= ppid
)
484 *_ppid
= (pid_t
) ppid
;
489 int write_one_line_file(const char *fn
, const char *line
) {
496 if (!(f
= fopen(fn
, "we")))
499 if (fputs(line
, f
) < 0) {
510 int read_one_line_file(const char *fn
, char **line
) {
518 if (!(f
= fopen(fn
, "re")))
521 if (!(fgets(t
, sizeof(t
), f
))) {
526 if (!(c
= strdup(t
))) {
539 char *truncate_nl(char *s
) {
542 s
[strcspn(s
, NEWLINE
)] = 0;
546 int get_process_name(pid_t pid
, char **name
) {
553 if (asprintf(&p
, "/proc/%llu/comm", (unsigned long long) pid
) < 0)
556 r
= read_one_line_file(p
, name
);
566 char *strappend(const char *s
, const char *suffix
) {
576 if (!(r
= new(char, a
+b
+1)))
580 memcpy(r
+a
, suffix
, b
);
586 int readlink_malloc(const char *p
, char **r
) {
596 if (!(c
= new(char, l
)))
599 if ((n
= readlink(p
, c
, l
-1)) < 0) {
605 if ((size_t) n
< l
-1) {
616 int readlink_and_make_absolute(const char *p
, char **r
) {
623 if ((j
= readlink_malloc(p
, &target
)) < 0)
626 k
= file_in_same_dir(p
, target
);
636 char *file_name_from_path(const char *p
) {
641 if ((r
= strrchr(p
, '/')))
647 bool path_is_absolute(const char *p
) {
653 bool is_path(const char *p
) {
655 return !!strchr(p
, '/');
658 char *path_make_absolute(const char *p
, const char *prefix
) {
663 /* Makes every item in the list an absolute path by prepending
664 * the prefix, if specified and necessary */
666 if (path_is_absolute(p
) || !prefix
)
669 if (asprintf(&r
, "%s/%s", prefix
, p
) < 0)
675 char *path_make_absolute_cwd(const char *p
) {
680 /* Similar to path_make_absolute(), but prefixes with the
681 * current working directory. */
683 if (path_is_absolute(p
))
686 if (!(cwd
= get_current_dir_name()))
689 r
= path_make_absolute(p
, cwd
);
695 char **strv_path_make_absolute_cwd(char **l
) {
698 /* Goes through every item in the string list and makes it
699 * absolute. This works in place and won't rollback any
700 * changes on failure. */
705 if (!(t
= path_make_absolute_cwd(*s
)))
715 char **strv_path_canonicalize(char **l
) {
723 /* Goes through every item in the string list and canonicalize
724 * the path. This works in place and won't rollback any
725 * changes on failure. */
730 t
= path_make_absolute_cwd(*s
);
739 u
= canonicalize_file_name(t
);
743 if (errno
== ENOMEM
|| !errno
)
760 int reset_all_signal_handlers(void) {
763 for (sig
= 1; sig
< _NSIG
; sig
++) {
766 if (sig
== SIGKILL
|| sig
== SIGSTOP
)
770 sa
.sa_handler
= SIG_DFL
;
771 sa
.sa_flags
= SA_RESTART
;
773 /* On Linux the first two RT signals are reserved by
774 * glibc, and sigaction() will return EINVAL for them. */
775 if ((sigaction(sig
, &sa
, NULL
) < 0))
783 char *strstrip(char *s
) {
786 /* Drops trailing whitespace. Modifies the string in
787 * place. Returns pointer to first non-space character */
789 s
+= strspn(s
, WHITESPACE
);
792 if (!strchr(WHITESPACE
, *e
))
803 char *delete_chars(char *s
, const char *bad
) {
806 /* Drops all whitespace, regardless where in the string */
808 for (f
= s
, t
= s
; *f
; f
++) {
820 char *file_in_same_dir(const char *path
, const char *filename
) {
827 /* This removes the last component of path and appends
828 * filename, unless the latter is absolute anyway or the
831 if (path_is_absolute(filename
))
832 return strdup(filename
);
834 if (!(e
= strrchr(path
, '/')))
835 return strdup(filename
);
837 k
= strlen(filename
);
838 if (!(r
= new(char, e
-path
+1+k
+1)))
841 memcpy(r
, path
, e
-path
+1);
842 memcpy(r
+(e
-path
)+1, filename
, k
+1);
847 int mkdir_parents(const char *path
, mode_t mode
) {
852 /* Creates every parent directory in the path except the last
855 p
= path
+ strspn(path
, "/");
860 e
= p
+ strcspn(p
, "/");
861 p
= e
+ strspn(e
, "/");
863 /* Is this the last component? If so, then we're
868 if (!(t
= strndup(path
, e
- path
)))
875 if (r
< 0 && errno
!= EEXIST
)
880 int mkdir_p(const char *path
, mode_t mode
) {
885 if ((r
= mkdir_parents(path
, mode
)) < 0)
888 if (mkdir(path
, mode
) < 0)
894 char hexchar(int x
) {
895 static const char table
[16] = "0123456789abcdef";
897 return table
[x
& 15];
900 int unhexchar(char c
) {
902 if (c
>= '0' && c
<= '9')
905 if (c
>= 'a' && c
<= 'f')
908 if (c
>= 'A' && c
<= 'F')
914 char octchar(int x
) {
915 return '0' + (x
& 7);
918 int unoctchar(char c
) {
920 if (c
>= '0' && c
<= '7')
926 char decchar(int x
) {
927 return '0' + (x
% 10);
930 int undecchar(char c
) {
932 if (c
>= '0' && c
<= '9')
938 char *cescape(const char *s
) {
944 /* Does C style string escaping. */
946 if (!(r
= new(char, strlen(s
)*4 + 1)))
949 for (f
= s
, t
= r
; *f
; f
++)
995 /* For special chars we prefer octal over
996 * hexadecimal encoding, simply because glib's
997 * g_strescape() does the same */
998 if ((*f
< ' ') || (*f
>= 127)) {
1000 *(t
++) = octchar((unsigned char) *f
>> 6);
1001 *(t
++) = octchar((unsigned char) *f
>> 3);
1002 *(t
++) = octchar((unsigned char) *f
);
1013 char *cunescape(const char *s
) {
1019 /* Undoes C style string escaping */
1021 if (!(r
= new(char, strlen(s
)+1)))
1024 for (f
= s
, t
= r
; *f
; f
++) {
1067 /* hexadecimal encoding */
1070 if ((a
= unhexchar(f
[1])) < 0 ||
1071 (b
= unhexchar(f
[2])) < 0) {
1072 /* Invalid escape code, let's take it literal then */
1076 *(t
++) = (char) ((a
<< 4) | b
);
1091 /* octal encoding */
1094 if ((a
= unoctchar(f
[0])) < 0 ||
1095 (b
= unoctchar(f
[1])) < 0 ||
1096 (c
= unoctchar(f
[2])) < 0) {
1097 /* Invalid escape code, let's take it literal then */
1101 *(t
++) = (char) ((a
<< 6) | (b
<< 3) | c
);
1109 /* premature end of string.*/
1114 /* Invalid escape code, let's take it literal then */
1127 char *xescape(const char *s
, const char *bad
) {
1131 /* Escapes all chars in bad, in addition to \ and all special
1132 * chars, in \xFF style escaping. May be reversed with
1135 if (!(r
= new(char, strlen(s
)*4+1)))
1138 for (f
= s
, t
= r
; *f
; f
++) {
1140 if ((*f
< ' ') || (*f
>= 127) ||
1141 (*f
== '\\') || strchr(bad
, *f
)) {
1144 *(t
++) = hexchar(*f
>> 4);
1145 *(t
++) = hexchar(*f
);
1155 char *bus_path_escape(const char *s
) {
1161 /* Escapes all chars that D-Bus' object path cannot deal
1162 * with. Can be reverse with bus_path_unescape() */
1164 if (!(r
= new(char, strlen(s
)*3+1)))
1167 for (f
= s
, t
= r
; *f
; f
++) {
1169 if (!(*f
>= 'A' && *f
<= 'Z') &&
1170 !(*f
>= 'a' && *f
<= 'z') &&
1171 !(*f
>= '0' && *f
<= '9')) {
1173 *(t
++) = hexchar(*f
>> 4);
1174 *(t
++) = hexchar(*f
);
1184 char *bus_path_unescape(const char *f
) {
1189 if (!(r
= strdup(f
)))
1192 for (t
= r
; *f
; f
++) {
1197 if ((a
= unhexchar(f
[1])) < 0 ||
1198 (b
= unhexchar(f
[2])) < 0) {
1199 /* Invalid escape code, let's take it literal then */
1202 *(t
++) = (char) ((a
<< 4) | b
);
1214 char *path_kill_slashes(char *path
) {
1218 /* Removes redundant inner and trailing slashes. Modifies the
1219 * passed string in-place.
1221 * ///foo///bar/ becomes /foo/bar
1224 for (f
= path
, t
= path
; *f
; f
++) {
1239 /* Special rule, if we are talking of the root directory, a
1240 trailing slash is good */
1242 if (t
== path
&& slash
)
1249 bool path_startswith(const char *path
, const char *prefix
) {
1253 if ((path
[0] == '/') != (prefix
[0] == '/'))
1259 path
+= strspn(path
, "/");
1260 prefix
+= strspn(prefix
, "/");
1268 a
= strcspn(path
, "/");
1269 b
= strcspn(prefix
, "/");
1274 if (memcmp(path
, prefix
, a
) != 0)
1282 bool path_equal(const char *a
, const char *b
) {
1286 if ((a
[0] == '/') != (b
[0] == '/'))
1292 a
+= strspn(a
, "/");
1293 b
+= strspn(b
, "/");
1295 if (*a
== 0 && *b
== 0)
1298 if (*a
== 0 || *b
== 0)
1301 j
= strcspn(a
, "/");
1302 k
= strcspn(b
, "/");
1307 if (memcmp(a
, b
, j
) != 0)
1315 char *ascii_strlower(char *t
) {
1320 for (p
= t
; *p
; p
++)
1321 if (*p
>= 'A' && *p
<= 'Z')
1322 *p
= *p
- 'A' + 'a';
1327 bool ignore_file(const char *filename
) {
1331 filename
[0] == '.' ||
1332 streq(filename
, "lost+found") ||
1333 endswith(filename
, "~") ||
1334 endswith(filename
, ".rpmnew") ||
1335 endswith(filename
, ".rpmsave") ||
1336 endswith(filename
, ".rpmorig") ||
1337 endswith(filename
, ".dpkg-old") ||
1338 endswith(filename
, ".dpkg-new") ||
1339 endswith(filename
, ".swp");
1342 int fd_nonblock(int fd
, bool nonblock
) {
1347 if ((flags
= fcntl(fd
, F_GETFL
, 0)) < 0)
1351 flags
|= O_NONBLOCK
;
1353 flags
&= ~O_NONBLOCK
;
1355 if (fcntl(fd
, F_SETFL
, flags
) < 0)
1361 int fd_cloexec(int fd
, bool cloexec
) {
1366 if ((flags
= fcntl(fd
, F_GETFD
, 0)) < 0)
1370 flags
|= FD_CLOEXEC
;
1372 flags
&= ~FD_CLOEXEC
;
1374 if (fcntl(fd
, F_SETFD
, flags
) < 0)
1380 int close_all_fds(const int except
[], unsigned n_except
) {
1385 if (!(d
= opendir("/proc/self/fd")))
1388 while ((de
= readdir(d
))) {
1391 if (ignore_file(de
->d_name
))
1394 if ((r
= safe_atoi(de
->d_name
, &fd
)) < 0)
1408 for (i
= 0; i
< n_except
; i
++)
1409 if (except
[i
] == fd
) {
1418 if ((r
= close_nointr(fd
)) < 0) {
1419 /* Valgrind has its own FD and doesn't want to have it closed */
1432 bool chars_intersect(const char *a
, const char *b
) {
1435 /* Returns true if any of the chars in a are in b. */
1436 for (p
= a
; *p
; p
++)
1443 char *format_timestamp(char *buf
, size_t l
, usec_t t
) {
1453 sec
= (time_t) t
/ USEC_PER_SEC
;
1455 if (strftime(buf
, l
, "%a, %d %b %Y %H:%M:%S %z", localtime_r(&sec
, &tm
)) <= 0)
1461 char *format_timespan(char *buf
, size_t l
, usec_t t
) {
1462 static const struct {
1466 { "w", USEC_PER_WEEK
},
1467 { "d", USEC_PER_DAY
},
1468 { "h", USEC_PER_HOUR
},
1469 { "min", USEC_PER_MINUTE
},
1470 { "s", USEC_PER_SEC
},
1471 { "ms", USEC_PER_MSEC
},
1481 if (t
== (usec_t
) -1)
1484 /* The result of this function can be parsed with parse_usec */
1486 for (i
= 0; i
< ELEMENTSOF(table
); i
++) {
1490 if (t
< table
[i
].usec
)
1496 k
= snprintf(p
, l
, "%s%llu%s", p
> buf
? " " : "", (unsigned long long) (t
/ table
[i
].usec
), table
[i
].suffix
);
1497 n
= MIN((size_t) k
, l
);
1510 bool fstype_is_network(const char *fstype
) {
1511 static const char * const table
[] = {
1523 for (i
= 0; i
< ELEMENTSOF(table
); i
++)
1524 if (streq(table
[i
], fstype
))
1533 if ((fd
= open("/dev/tty0", O_RDWR
|O_NOCTTY
|O_CLOEXEC
)) < 0)
1538 TIOCL_GETKMSGREDIRECT
,
1542 if (ioctl(fd
, TIOCLINUX
, tiocl
) < 0)
1545 vt
= tiocl
[0] <= 0 ? 1 : tiocl
[0];
1548 if (ioctl(fd
, VT_ACTIVATE
, vt
) < 0)
1551 close_nointr_nofail(r
);
1555 int read_one_char(FILE *f
, char *ret
, bool *need_nl
) {
1556 struct termios old_termios
, new_termios
;
1563 if (tcgetattr(fileno(f
), &old_termios
) >= 0) {
1564 new_termios
= old_termios
;
1566 new_termios
.c_lflag
&= ~ICANON
;
1567 new_termios
.c_cc
[VMIN
] = 1;
1568 new_termios
.c_cc
[VTIME
] = 0;
1570 if (tcsetattr(fileno(f
), TCSADRAIN
, &new_termios
) >= 0) {
1573 k
= fread(&c
, 1, 1, f
);
1575 tcsetattr(fileno(f
), TCSADRAIN
, &old_termios
);
1581 *need_nl
= c
!= '\n';
1588 if (!(fgets(line
, sizeof(line
), f
)))
1593 if (strlen(line
) != 1)
1603 int ask(char *ret
, const char *replies
, const char *text
, ...) {
1612 bool need_nl
= true;
1614 fputs("\x1B[1m", stdout
);
1620 fputs("\x1B[0m", stdout
);
1624 if ((r
= read_one_char(stdin
, &c
, &need_nl
)) < 0) {
1626 if (r
== -EBADMSG
) {
1627 puts("Bad input, please try again.");
1638 if (strchr(replies
, c
)) {
1643 puts("Read unexpected character, please try again.");
1647 int reset_terminal(int fd
) {
1648 struct termios termios
;
1653 /* Set terminal to some sane defaults */
1655 if (tcgetattr(fd
, &termios
) < 0) {
1660 /* We only reset the stuff that matters to the software. How
1661 * hardware is set up we don't touch assuming that somebody
1662 * else will do that for us */
1664 termios
.c_iflag
&= ~(IGNBRK
| BRKINT
| ISTRIP
| INLCR
| IGNCR
| IUCLC
);
1665 termios
.c_iflag
|= ICRNL
| IMAXBEL
| IUTF8
;
1666 termios
.c_oflag
|= ONLCR
;
1667 termios
.c_cflag
|= CREAD
;
1668 termios
.c_lflag
= ISIG
| ICANON
| IEXTEN
| ECHO
| ECHOE
| ECHOK
| ECHOCTL
| ECHOPRT
| ECHOKE
;
1670 termios
.c_cc
[VINTR
] = 03; /* ^C */
1671 termios
.c_cc
[VQUIT
] = 034; /* ^\ */
1672 termios
.c_cc
[VERASE
] = 0177;
1673 termios
.c_cc
[VKILL
] = 025; /* ^X */
1674 termios
.c_cc
[VEOF
] = 04; /* ^D */
1675 termios
.c_cc
[VSTART
] = 021; /* ^Q */
1676 termios
.c_cc
[VSTOP
] = 023; /* ^S */
1677 termios
.c_cc
[VSUSP
] = 032; /* ^Z */
1678 termios
.c_cc
[VLNEXT
] = 026; /* ^V */
1679 termios
.c_cc
[VWERASE
] = 027; /* ^W */
1680 termios
.c_cc
[VREPRINT
] = 022; /* ^R */
1681 termios
.c_cc
[VEOL
] = 0;
1682 termios
.c_cc
[VEOL2
] = 0;
1684 termios
.c_cc
[VTIME
] = 0;
1685 termios
.c_cc
[VMIN
] = 1;
1687 if (tcsetattr(fd
, TCSANOW
, &termios
) < 0)
1691 /* Just in case, flush all crap out */
1692 tcflush(fd
, TCIOFLUSH
);
1697 int open_terminal(const char *name
, int mode
) {
1700 if ((fd
= open(name
, mode
)) < 0)
1703 if ((r
= isatty(fd
)) < 0) {
1704 close_nointr_nofail(fd
);
1709 close_nointr_nofail(fd
);
1716 int flush_fd(int fd
) {
1717 struct pollfd pollfd
;
1721 pollfd
.events
= POLLIN
;
1728 if ((r
= poll(&pollfd
, 1, 0)) < 0) {
1739 if ((l
= read(fd
, buf
, sizeof(buf
))) < 0) {
1744 if (errno
== EAGAIN
)
1755 int acquire_terminal(const char *name
, bool fail
, bool force
, bool ignore_tiocstty_eperm
) {
1756 int fd
= -1, notify
= -1, r
, wd
= -1;
1760 /* We use inotify to be notified when the tty is closed. We
1761 * create the watch before checking if we can actually acquire
1762 * it, so that we don't lose any event.
1764 * Note: strictly speaking this actually watches for the
1765 * device being closed, it does *not* really watch whether a
1766 * tty loses its controlling process. However, unless some
1767 * rogue process uses TIOCNOTTY on /dev/tty *after* closing
1768 * its tty otherwise this will not become a problem. As long
1769 * as the administrator makes sure not configure any service
1770 * on the same tty as an untrusted user this should not be a
1771 * problem. (Which he probably should not do anyway.) */
1773 if (!fail
&& !force
) {
1774 if ((notify
= inotify_init1(IN_CLOEXEC
)) < 0) {
1779 if ((wd
= inotify_add_watch(notify
, name
, IN_CLOSE
)) < 0) {
1787 if ((r
= flush_fd(notify
)) < 0)
1790 /* We pass here O_NOCTTY only so that we can check the return
1791 * value TIOCSCTTY and have a reliable way to figure out if we
1792 * successfully became the controlling process of the tty */
1793 if ((fd
= open_terminal(name
, O_RDWR
|O_NOCTTY
)) < 0)
1796 /* First, try to get the tty */
1797 r
= ioctl(fd
, TIOCSCTTY
, force
);
1799 /* Sometimes it makes sense to ignore TIOCSCTTY
1800 * returning EPERM, i.e. when very likely we already
1801 * are have this controlling terminal. */
1802 if (r
< 0 && errno
== EPERM
&& ignore_tiocstty_eperm
)
1805 if (r
< 0 && (force
|| fail
|| errno
!= EPERM
)) {
1815 assert(notify
>= 0);
1818 struct inotify_event e
;
1821 if ((l
= read(notify
, &e
, sizeof(e
))) != sizeof(e
)) {
1835 if (e
.wd
!= wd
|| !(e
.mask
& IN_CLOSE
)) {
1843 /* We close the tty fd here since if the old session
1844 * ended our handle will be dead. It's important that
1845 * we do this after sleeping, so that we don't enter
1846 * an endless loop. */
1847 close_nointr_nofail(fd
);
1851 close_nointr_nofail(notify
);
1853 if ((r
= reset_terminal(fd
)) < 0)
1854 log_warning("Failed to reset terminal: %s", strerror(-r
));
1860 close_nointr_nofail(fd
);
1863 close_nointr_nofail(notify
);
1868 int release_terminal(void) {
1870 struct sigaction sa_old
, sa_new
;
1872 if ((fd
= open("/dev/tty", O_RDWR
|O_NOCTTY
|O_NDELAY
)) < 0)
1875 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
1876 * by our own TIOCNOTTY */
1879 sa_new
.sa_handler
= SIG_IGN
;
1880 sa_new
.sa_flags
= SA_RESTART
;
1881 assert_se(sigaction(SIGHUP
, &sa_new
, &sa_old
) == 0);
1883 if (ioctl(fd
, TIOCNOTTY
) < 0)
1886 assert_se(sigaction(SIGHUP
, &sa_old
, NULL
) == 0);
1888 close_nointr_nofail(fd
);
1892 int sigaction_many(const struct sigaction
*sa
, ...) {
1897 while ((sig
= va_arg(ap
, int)) > 0)
1898 if (sigaction(sig
, sa
, NULL
) < 0)
1905 int ignore_signals(int sig
, ...) {
1906 struct sigaction sa
;
1911 sa
.sa_handler
= SIG_IGN
;
1912 sa
.sa_flags
= SA_RESTART
;
1914 if (sigaction(sig
, &sa
, NULL
) < 0)
1918 while ((sig
= va_arg(ap
, int)) > 0)
1919 if (sigaction(sig
, &sa
, NULL
) < 0)
1926 int default_signals(int sig
, ...) {
1927 struct sigaction sa
;
1932 sa
.sa_handler
= SIG_DFL
;
1933 sa
.sa_flags
= SA_RESTART
;
1935 if (sigaction(sig
, &sa
, NULL
) < 0)
1939 while ((sig
= va_arg(ap
, int)) > 0)
1940 if (sigaction(sig
, &sa
, NULL
) < 0)
1947 int close_pipe(int p
[]) {
1953 a
= close_nointr(p
[0]);
1958 b
= close_nointr(p
[1]);
1962 return a
< 0 ? a
: b
;
1965 ssize_t
loop_read(int fd
, void *buf
, size_t nbytes
) {
1974 while (nbytes
> 0) {
1977 if ((k
= read(fd
, p
, nbytes
)) <= 0) {
1982 if (errno
== EAGAIN
) {
1983 struct pollfd pollfd
;
1987 pollfd
.events
= POLLIN
;
1989 if (poll(&pollfd
, 1, -1) < 0) {
1993 return n
> 0 ? n
: -errno
;
1996 if (pollfd
.revents
!= POLLIN
)
1997 return n
> 0 ? n
: -EIO
;
2002 return n
> 0 ? n
: (k
< 0 ? -errno
: 0);
2013 int path_is_mount_point(const char *t
) {
2017 if (lstat(t
, &a
) < 0) {
2019 if (errno
== ENOENT
)
2025 if (!(copy
= strdup(t
)))
2028 if (lstat(dirname(copy
), &b
) < 0) {
2035 return a
.st_dev
!= b
.st_dev
;
2038 int parse_usec(const char *t
, usec_t
*usec
) {
2039 static const struct {
2043 { "sec", USEC_PER_SEC
},
2044 { "s", USEC_PER_SEC
},
2045 { "min", USEC_PER_MINUTE
},
2046 { "hr", USEC_PER_HOUR
},
2047 { "h", USEC_PER_HOUR
},
2048 { "d", USEC_PER_DAY
},
2049 { "w", USEC_PER_WEEK
},
2050 { "msec", USEC_PER_MSEC
},
2051 { "ms", USEC_PER_MSEC
},
2052 { "m", USEC_PER_MINUTE
},
2055 { "", USEC_PER_SEC
},
2071 l
= strtoll(p
, &e
, 10);
2082 e
+= strspn(e
, WHITESPACE
);
2084 for (i
= 0; i
< ELEMENTSOF(table
); i
++)
2085 if (startswith(e
, table
[i
].suffix
)) {
2086 r
+= (usec_t
) l
* table
[i
].usec
;
2087 p
= e
+ strlen(table
[i
].suffix
);
2091 if (i
>= ELEMENTSOF(table
))
2101 int make_stdio(int fd
) {
2106 r
= dup2(fd
, STDIN_FILENO
);
2107 s
= dup2(fd
, STDOUT_FILENO
);
2108 t
= dup2(fd
, STDERR_FILENO
);
2111 close_nointr_nofail(fd
);
2113 if (r
< 0 || s
< 0 || t
< 0)
2119 bool is_clean_exit(int code
, int status
) {
2121 if (code
== CLD_EXITED
)
2124 /* If a daemon does not implement handlers for some of the
2125 * signals that's not considered an unclean shutdown */
2126 if (code
== CLD_KILLED
)
2130 status
== SIGTERM
||
2136 bool is_device_path(const char *path
) {
2138 /* Returns true on paths that refer to a device, either in
2139 * sysfs or in /dev */
2142 path_startswith(path
, "/dev/") ||
2143 path_startswith(path
, "/sys/");
2146 int dir_is_empty(const char *path
) {
2149 struct dirent buf
, *de
;
2151 if (!(d
= opendir(path
)))
2155 if ((r
= readdir_r(d
, &buf
, &de
)) > 0) {
2165 if (!ignore_file(de
->d_name
)) {
2175 unsigned long long random_ull(void) {
2180 if ((fd
= open("/dev/urandom", O_RDONLY
|O_CLOEXEC
|O_NOCTTY
)) < 0)
2183 r
= loop_read(fd
, &ull
, sizeof(ull
));
2184 close_nointr_nofail(fd
);
2186 if (r
!= sizeof(ull
))
2192 return random() * RAND_MAX
+ random();
2195 void rename_process(const char name
[8]) {
2198 prctl(PR_SET_NAME
, name
);
2200 /* This is a like a poor man's setproctitle(). The string
2201 * passed should fit in 7 chars (i.e. the length of
2204 if (program_invocation_name
)
2205 strncpy(program_invocation_name
, name
, strlen(program_invocation_name
));
2208 void sigset_add_many(sigset_t
*ss
, ...) {
2215 while ((sig
= va_arg(ap
, int)) > 0)
2216 assert_se(sigaddset(ss
, sig
) == 0);
2220 static const char *const ioprio_class_table
[] = {
2221 [IOPRIO_CLASS_NONE
] = "none",
2222 [IOPRIO_CLASS_RT
] = "realtime",
2223 [IOPRIO_CLASS_BE
] = "best-effort",
2224 [IOPRIO_CLASS_IDLE
] = "idle"
2227 DEFINE_STRING_TABLE_LOOKUP(ioprio_class
, int);
2229 static const char *const sigchld_code_table
[] = {
2230 [CLD_EXITED
] = "exited",
2231 [CLD_KILLED
] = "killed",
2232 [CLD_DUMPED
] = "dumped",
2233 [CLD_TRAPPED
] = "trapped",
2234 [CLD_STOPPED
] = "stopped",
2235 [CLD_CONTINUED
] = "continued",
2238 DEFINE_STRING_TABLE_LOOKUP(sigchld_code
, int);
2240 static const char *const log_facility_table
[LOG_NFACILITIES
] = {
2241 [LOG_FAC(LOG_KERN
)] = "kern",
2242 [LOG_FAC(LOG_USER
)] = "user",
2243 [LOG_FAC(LOG_MAIL
)] = "mail",
2244 [LOG_FAC(LOG_DAEMON
)] = "daemon",
2245 [LOG_FAC(LOG_AUTH
)] = "auth",
2246 [LOG_FAC(LOG_SYSLOG
)] = "syslog",
2247 [LOG_FAC(LOG_LPR
)] = "lpr",
2248 [LOG_FAC(LOG_NEWS
)] = "news",
2249 [LOG_FAC(LOG_UUCP
)] = "uucp",
2250 [LOG_FAC(LOG_CRON
)] = "cron",
2251 [LOG_FAC(LOG_AUTHPRIV
)] = "authpriv",
2252 [LOG_FAC(LOG_FTP
)] = "ftp",
2253 [LOG_FAC(LOG_LOCAL0
)] = "local0",
2254 [LOG_FAC(LOG_LOCAL1
)] = "local1",
2255 [LOG_FAC(LOG_LOCAL2
)] = "local2",
2256 [LOG_FAC(LOG_LOCAL3
)] = "local3",
2257 [LOG_FAC(LOG_LOCAL4
)] = "local4",
2258 [LOG_FAC(LOG_LOCAL5
)] = "local5",
2259 [LOG_FAC(LOG_LOCAL6
)] = "local6",
2260 [LOG_FAC(LOG_LOCAL7
)] = "local7"
2263 DEFINE_STRING_TABLE_LOOKUP(log_facility
, int);
2265 static const char *const log_level_table
[] = {
2266 [LOG_EMERG
] = "emerg",
2267 [LOG_ALERT
] = "alert",
2268 [LOG_CRIT
] = "crit",
2270 [LOG_WARNING
] = "warning",
2271 [LOG_NOTICE
] = "notice",
2272 [LOG_INFO
] = "info",
2273 [LOG_DEBUG
] = "debug"
2276 DEFINE_STRING_TABLE_LOOKUP(log_level
, int);
2278 static const char* const sched_policy_table
[] = {
2279 [SCHED_OTHER
] = "other",
2280 [SCHED_BATCH
] = "batch",
2281 [SCHED_IDLE
] = "idle",
2282 [SCHED_FIFO
] = "fifo",
2286 DEFINE_STRING_TABLE_LOOKUP(sched_policy
, int);
2288 static const char* const rlimit_table
[] = {
2289 [RLIMIT_CPU
] = "LimitCPU",
2290 [RLIMIT_FSIZE
] = "LimitFSIZE",
2291 [RLIMIT_DATA
] = "LimitDATA",
2292 [RLIMIT_STACK
] = "LimitSTACK",
2293 [RLIMIT_CORE
] = "LimitCORE",
2294 [RLIMIT_RSS
] = "LimitRSS",
2295 [RLIMIT_NOFILE
] = "LimitNOFILE",
2296 [RLIMIT_AS
] = "LimitAS",
2297 [RLIMIT_NPROC
] = "LimitNPROC",
2298 [RLIMIT_MEMLOCK
] = "LimitMEMLOCK",
2299 [RLIMIT_LOCKS
] = "LimitLOCKS",
2300 [RLIMIT_SIGPENDING
] = "LimitSIGPENDING",
2301 [RLIMIT_MSGQUEUE
] = "LimitMSGQUEUE",
2302 [RLIMIT_NICE
] = "LimitNICE",
2303 [RLIMIT_RTPRIO
] = "LimitRTPRIO",
2304 [RLIMIT_RTTIME
] = "LimitRTTIME"
2307 DEFINE_STRING_TABLE_LOOKUP(rlimit
, int);