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>
47 #include <sys/utsname.h>
49 #include <netinet/ip.h>
58 bool streq_ptr(const char *a, const char *b) {
60 /* Like streq(), but tries to make sense of NULL pointers */
71 usec_t now(clockid_t clock_id) {
74 assert_se(clock_gettime(clock_id, &ts) == 0);
76 return timespec_load(&ts);
79 dual_timestamp* dual_timestamp_get(dual_timestamp *ts) {
82 ts->realtime = now(CLOCK_REALTIME);
83 ts->monotonic = now(CLOCK_MONOTONIC);
88 usec_t timespec_load(const struct timespec *ts) {
92 (usec_t) ts->tv_sec * USEC_PER_SEC +
93 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
96 struct timespec *timespec_store(struct timespec *ts, usec_t u) {
99 ts->tv_sec = (time_t) (u / USEC_PER_SEC);
100 ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
105 usec_t timeval_load(const struct timeval *tv) {
109 (usec_t) tv->tv_sec * USEC_PER_SEC +
110 (usec_t) tv->tv_usec;
113 struct timeval *timeval_store(struct timeval *tv, usec_t u) {
116 tv->tv_sec = (time_t) (u / USEC_PER_SEC);
117 tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
122 bool endswith(const char *s, const char *postfix) {
129 pl = strlen(postfix);
137 return memcmp(s + sl - pl, postfix, pl) == 0;
140 bool startswith(const char *s, const char *prefix) {
155 return memcmp(s, prefix, pl) == 0;
158 bool startswith_no_case(const char *s, const char *prefix) {
174 for(i = 0; i < pl; ++i) {
175 if (tolower(s[i]) != tolower(prefix[i]))
182 bool first_word(const char *s, const char *word) {
197 if (memcmp(s, word, wl) != 0)
201 strchr(WHITESPACE, s[wl]);
204 int close_nointr(int fd) {
210 if ((r = close(fd)) >= 0)
218 void close_nointr_nofail(int fd) {
219 int saved_errno = errno;
221 /* like close_nointr() but cannot fail, and guarantees errno
224 assert_se(close_nointr(fd) == 0);
229 void close_many(const int fds[], unsigned n_fd) {
232 for (i = 0; i < n_fd; i++)
233 close_nointr_nofail(fds[i]);
236 int parse_boolean(const char *v) {
239 if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
241 else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
247 int parse_pid(const char *s, pid_t* ret_pid) {
255 if ((r = safe_atolu(s, &ul)) < 0)
260 if ((unsigned long) pid != ul)
270 int safe_atou(const char *s, unsigned *ret_u) {
278 l = strtoul(s, &x, 0);
280 if (!x || *x || errno)
281 return errno ? -errno : -EINVAL;
283 if ((unsigned long) (unsigned) l != l)
286 *ret_u = (unsigned) l;
290 int safe_atoi(const char *s, int *ret_i) {
298 l = strtol(s, &x, 0);
300 if (!x || *x || errno)
301 return errno ? -errno : -EINVAL;
303 if ((long) (int) l != l)
310 int safe_atollu(const char *s, long long unsigned *ret_llu) {
312 unsigned long long l;
318 l = strtoull(s, &x, 0);
320 if (!x || *x || errno)
321 return errno ? -errno : -EINVAL;
327 int safe_atolli(const char *s, long long int *ret_lli) {
335 l = strtoll(s, &x, 0);
337 if (!x || *x || errno)
338 return errno ? -errno : -EINVAL;
344 /* Split a string into words. */
345 char *split(const char *c, size_t *l, const char *separator, char **state) {
348 current = *state ? *state : (char*) c;
350 if (!*current || *c == 0)
353 current += strspn(current, separator);
354 *l = strcspn(current, separator);
357 return (char*) current;
360 /* Split a string into words, but consider strings enclosed in '' and
361 * "" as words even if they include spaces. */
362 char *split_quoted(const char *c, size_t *l, char **state) {
364 bool escaped = false;
366 current = *state ? *state : (char*) c;
368 if (!*current || *c == 0)
371 current += strspn(current, WHITESPACE);
373 if (*current == '\'') {
376 for (e = current; *e; e++) {
386 *state = *e == 0 ? e : e+1;
387 } else if (*current == '\"') {
390 for (e = current; *e; e++) {
400 *state = *e == 0 ? e : e+1;
402 for (e = current; *e; e++) {
407 else if (strchr(WHITESPACE, *e))
414 return (char*) current;
417 char **split_path_and_make_absolute(const char *p) {
421 if (!(l = strv_split(p, ":")))
424 if (!strv_path_make_absolute_cwd(l)) {
432 int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
435 char fn[132], line[256], *p;
441 assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1));
442 fn[sizeof(fn)-1] = 0;
444 if (!(f = fopen(fn, "r")))
447 if (!(fgets(line, sizeof(line), f))) {
455 /* Let's skip the pid and comm fields. The latter is enclosed
456 * in () but does not escape any () in its value, so let's
457 * skip over it manually */
459 if (!(p = strrchr(line, ')')))
470 if ((long unsigned) (pid_t) ppid != ppid)
473 *_ppid = (pid_t) ppid;
478 int write_one_line_file(const char *fn, const char *line) {
485 if (!(f = fopen(fn, "we")))
488 if (fputs(line, f) < 0) {
499 int read_one_line_file(const char *fn, char **line) {
507 if (!(f = fopen(fn, "re")))
510 if (!(fgets(t, sizeof(t), f))) {
515 if (!(c = strdup(t))) {
528 char *truncate_nl(char *s) {
531 s[strcspn(s, NEWLINE)] = 0;
535 int get_process_name(pid_t pid, char **name) {
542 if (asprintf(&p, "/proc/%lu/comm", (unsigned long) pid) < 0)
545 r = read_one_line_file(p, name);
555 int get_process_cmdline(pid_t pid, size_t max_length, char **line) {
563 assert(max_length > 0);
566 if (asprintf(&p, "/proc/%lu/cmdline", (unsigned long) pid) < 0)
575 if (!(r = new(char, max_length))) {
582 while ((c = getc(f)) != EOF) {
604 size_t n = MIN(left-1, 3U);
616 char *strappend(const char *s, const char *suffix) {
626 if (!(r = new(char, a+b+1)))
630 memcpy(r+a, suffix, b);
636 int readlink_malloc(const char *p, char **r) {
646 if (!(c = new(char, l)))
649 if ((n = readlink(p, c, l-1)) < 0) {
655 if ((size_t) n < l-1) {
666 int readlink_and_make_absolute(const char *p, char **r) {
673 if ((j = readlink_malloc(p, &target)) < 0)
676 k = file_in_same_dir(p, target);
686 char *file_name_from_path(const char *p) {
691 if ((r = strrchr(p, '/')))
697 bool path_is_absolute(const char *p) {
703 bool is_path(const char *p) {
705 return !!strchr(p, '/');
708 char *path_make_absolute(const char *p, const char *prefix) {
713 /* Makes every item in the list an absolute path by prepending
714 * the prefix, if specified and necessary */
716 if (path_is_absolute(p) || !prefix)
719 if (asprintf(&r, "%s/%s", prefix, p) < 0)
725 char *path_make_absolute_cwd(const char *p) {
730 /* Similar to path_make_absolute(), but prefixes with the
731 * current working directory. */
733 if (path_is_absolute(p))
736 if (!(cwd = get_current_dir_name()))
739 r = path_make_absolute(p, cwd);
745 char **strv_path_make_absolute_cwd(char **l) {
748 /* Goes through every item in the string list and makes it
749 * absolute. This works in place and won't rollback any
750 * changes on failure. */
755 if (!(t = path_make_absolute_cwd(*s)))
765 char **strv_path_canonicalize(char **l) {
773 /* Goes through every item in the string list and canonicalize
774 * the path. This works in place and won't rollback any
775 * changes on failure. */
780 t = path_make_absolute_cwd(*s);
789 u = canonicalize_file_name(t);
793 if (errno == ENOMEM || !errno)
810 int reset_all_signal_handlers(void) {
813 for (sig = 1; sig < _NSIG; sig++) {
816 if (sig == SIGKILL || sig == SIGSTOP)
820 sa.sa_handler = SIG_DFL;
821 sa.sa_flags = SA_RESTART;
823 /* On Linux the first two RT signals are reserved by
824 * glibc, and sigaction() will return EINVAL for them. */
825 if ((sigaction(sig, &sa, NULL) < 0))
833 char *strstrip(char *s) {
836 /* Drops trailing whitespace. Modifies the string in
837 * place. Returns pointer to first non-space character */
839 s += strspn(s, WHITESPACE);
842 if (!strchr(WHITESPACE, *e))
853 char *delete_chars(char *s, const char *bad) {
856 /* Drops all whitespace, regardless where in the string */
858 for (f = s, t = s; *f; f++) {
870 char *file_in_same_dir(const char *path, const char *filename) {
877 /* This removes the last component of path and appends
878 * filename, unless the latter is absolute anyway or the
881 if (path_is_absolute(filename))
882 return strdup(filename);
884 if (!(e = strrchr(path, '/')))
885 return strdup(filename);
887 k = strlen(filename);
888 if (!(r = new(char, e-path+1+k+1)))
891 memcpy(r, path, e-path+1);
892 memcpy(r+(e-path)+1, filename, k+1);
897 int safe_mkdir(const char *path, mode_t mode, uid_t uid, gid_t gid) {
900 if (mkdir(path, mode) >= 0)
901 if (chmod_and_chown(path, mode, uid, gid) < 0)
904 if (lstat(path, &st) < 0)
907 if ((st.st_mode & 0777) != mode ||
910 !S_ISDIR(st.st_mode)) {
919 int mkdir_parents(const char *path, mode_t mode) {
924 /* Creates every parent directory in the path except the last
927 p = path + strspn(path, "/");
932 e = p + strcspn(p, "/");
933 p = e + strspn(e, "/");
935 /* Is this the last component? If so, then we're
940 if (!(t = strndup(path, e - path)))
947 if (r < 0 && errno != EEXIST)
952 int mkdir_p(const char *path, mode_t mode) {
957 if ((r = mkdir_parents(path, mode)) < 0)
960 if (mkdir(path, mode) < 0)
966 int rmdir_parents(const char *path, const char *stop) {
975 /* Skip trailing slashes */
976 while (l > 0 && path[l-1] == '/')
982 /* Skip last component */
983 while (l > 0 && path[l-1] != '/')
986 /* Skip trailing slashes */
987 while (l > 0 && path[l-1] == '/')
993 if (!(t = strndup(path, l)))
996 if (path_startswith(stop, t)) {
1005 if (errno != ENOENT)
1013 char hexchar(int x) {
1014 static const char table[16] = "0123456789abcdef";
1016 return table[x & 15];
1019 int unhexchar(char c) {
1021 if (c >= '0' && c <= '9')
1024 if (c >= 'a' && c <= 'f')
1025 return c - 'a' + 10;
1027 if (c >= 'A' && c <= 'F')
1028 return c - 'A' + 10;
1033 char octchar(int x) {
1034 return '0' + (x & 7);
1037 int unoctchar(char c) {
1039 if (c >= '0' && c <= '7')
1045 char decchar(int x) {
1046 return '0' + (x % 10);
1049 int undecchar(char c) {
1051 if (c >= '0' && c <= '9')
1057 char *cescape(const char *s) {
1063 /* Does C style string escaping. */
1065 if (!(r = new(char, strlen(s)*4 + 1)))
1068 for (f = s, t = r; *f; f++)
1114 /* For special chars we prefer octal over
1115 * hexadecimal encoding, simply because glib's
1116 * g_strescape() does the same */
1117 if ((*f < ' ') || (*f >= 127)) {
1119 *(t++) = octchar((unsigned char) *f >> 6);
1120 *(t++) = octchar((unsigned char) *f >> 3);
1121 *(t++) = octchar((unsigned char) *f);
1132 char *cunescape_length(const char *s, size_t length) {
1138 /* Undoes C style string escaping */
1140 if (!(r = new(char, length+1)))
1143 for (f = s, t = r; f < s + length; f++) {
1186 /* hexadecimal encoding */
1189 if ((a = unhexchar(f[1])) < 0 ||
1190 (b = unhexchar(f[2])) < 0) {
1191 /* Invalid escape code, let's take it literal then */
1195 *(t++) = (char) ((a << 4) | b);
1210 /* octal encoding */
1213 if ((a = unoctchar(f[0])) < 0 ||
1214 (b = unoctchar(f[1])) < 0 ||
1215 (c = unoctchar(f[2])) < 0) {
1216 /* Invalid escape code, let's take it literal then */
1220 *(t++) = (char) ((a << 6) | (b << 3) | c);
1228 /* premature end of string.*/
1233 /* Invalid escape code, let's take it literal then */
1245 char *cunescape(const char *s) {
1246 return cunescape_length(s, strlen(s));
1249 char *xescape(const char *s, const char *bad) {
1253 /* Escapes all chars in bad, in addition to \ and all special
1254 * chars, in \xFF style escaping. May be reversed with
1257 if (!(r = new(char, strlen(s)*4+1)))
1260 for (f = s, t = r; *f; f++) {
1262 if ((*f < ' ') || (*f >= 127) ||
1263 (*f == '\\') || strchr(bad, *f)) {
1266 *(t++) = hexchar(*f >> 4);
1267 *(t++) = hexchar(*f);
1277 char *bus_path_escape(const char *s) {
1283 /* Escapes all chars that D-Bus' object path cannot deal
1284 * with. Can be reverse with bus_path_unescape() */
1286 if (!(r = new(char, strlen(s)*3+1)))
1289 for (f = s, t = r; *f; f++) {
1291 if (!(*f >= 'A' && *f <= 'Z') &&
1292 !(*f >= 'a' && *f <= 'z') &&
1293 !(*f >= '0' && *f <= '9')) {
1295 *(t++) = hexchar(*f >> 4);
1296 *(t++) = hexchar(*f);
1306 char *bus_path_unescape(const char *f) {
1311 if (!(r = strdup(f)))
1314 for (t = r; *f; f++) {
1319 if ((a = unhexchar(f[1])) < 0 ||
1320 (b = unhexchar(f[2])) < 0) {
1321 /* Invalid escape code, let's take it literal then */
1324 *(t++) = (char) ((a << 4) | b);
1336 char *path_kill_slashes(char *path) {
1340 /* Removes redundant inner and trailing slashes. Modifies the
1341 * passed string in-place.
1343 * ///foo///bar/ becomes /foo/bar
1346 for (f = path, t = path; *f; f++) {
1361 /* Special rule, if we are talking of the root directory, a
1362 trailing slash is good */
1364 if (t == path && slash)
1371 bool path_startswith(const char *path, const char *prefix) {
1375 if ((path[0] == '/') != (prefix[0] == '/'))
1381 path += strspn(path, "/");
1382 prefix += strspn(prefix, "/");
1390 a = strcspn(path, "/");
1391 b = strcspn(prefix, "/");
1396 if (memcmp(path, prefix, a) != 0)
1404 bool path_equal(const char *a, const char *b) {
1408 if ((a[0] == '/') != (b[0] == '/'))
1414 a += strspn(a, "/");
1415 b += strspn(b, "/");
1417 if (*a == 0 && *b == 0)
1420 if (*a == 0 || *b == 0)
1423 j = strcspn(a, "/");
1424 k = strcspn(b, "/");
1429 if (memcmp(a, b, j) != 0)
1437 char *ascii_strlower(char *t) {
1442 for (p = t; *p; p++)
1443 if (*p >= 'A' && *p <= 'Z')
1444 *p = *p - 'A' + 'a';
1449 bool ignore_file(const char *filename) {
1453 filename[0] == '.' ||
1454 streq(filename, "lost+found") ||
1455 endswith(filename, "~") ||
1456 endswith(filename, ".rpmnew") ||
1457 endswith(filename, ".rpmsave") ||
1458 endswith(filename, ".rpmorig") ||
1459 endswith(filename, ".dpkg-old") ||
1460 endswith(filename, ".dpkg-new") ||
1461 endswith(filename, ".swp");
1464 int fd_nonblock(int fd, bool nonblock) {
1469 if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
1473 flags |= O_NONBLOCK;
1475 flags &= ~O_NONBLOCK;
1477 if (fcntl(fd, F_SETFL, flags) < 0)
1483 int fd_cloexec(int fd, bool cloexec) {
1488 if ((flags = fcntl(fd, F_GETFD, 0)) < 0)
1492 flags |= FD_CLOEXEC;
1494 flags &= ~FD_CLOEXEC;
1496 if (fcntl(fd, F_SETFD, flags) < 0)
1502 int close_all_fds(const int except[], unsigned n_except) {
1507 if (!(d = opendir("/proc/self/fd")))
1510 while ((de = readdir(d))) {
1513 if (ignore_file(de->d_name))
1516 if ((r = safe_atoi(de->d_name, &fd)) < 0)
1530 for (i = 0; i < n_except; i++)
1531 if (except[i] == fd) {
1540 if ((r = close_nointr(fd)) < 0) {
1541 /* Valgrind has its own FD and doesn't want to have it closed */
1554 bool chars_intersect(const char *a, const char *b) {
1557 /* Returns true if any of the chars in a are in b. */
1558 for (p = a; *p; p++)
1565 char *format_timestamp(char *buf, size_t l, usec_t t) {
1575 sec = (time_t) (t / USEC_PER_SEC);
1577 if (strftime(buf, l, "%a, %d %b %Y %H:%M:%S %z", localtime_r(&sec, &tm)) <= 0)
1583 char *format_timespan(char *buf, size_t l, usec_t t) {
1584 static const struct {
1588 { "w", USEC_PER_WEEK },
1589 { "d", USEC_PER_DAY },
1590 { "h", USEC_PER_HOUR },
1591 { "min", USEC_PER_MINUTE },
1592 { "s", USEC_PER_SEC },
1593 { "ms", USEC_PER_MSEC },
1603 if (t == (usec_t) -1)
1606 /* The result of this function can be parsed with parse_usec */
1608 for (i = 0; i < ELEMENTSOF(table); i++) {
1612 if (t < table[i].usec)
1618 k = snprintf(p, l, "%s%llu%s", p > buf ? " " : "", (unsigned long long) (t / table[i].usec), table[i].suffix);
1619 n = MIN((size_t) k, l);
1632 bool fstype_is_network(const char *fstype) {
1633 static const char * const table[] = {
1645 for (i = 0; i < ELEMENTSOF(table); i++)
1646 if (streq(table[i], fstype))
1655 if ((fd = open("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0)
1660 TIOCL_GETKMSGREDIRECT,
1664 if (ioctl(fd, TIOCLINUX, tiocl) < 0)
1667 vt = tiocl[0] <= 0 ? 1 : tiocl[0];
1670 if (ioctl(fd, VT_ACTIVATE, vt) < 0)
1673 close_nointr_nofail(r);
1677 int read_one_char(FILE *f, char *ret, bool *need_nl) {
1678 struct termios old_termios, new_termios;
1685 if (tcgetattr(fileno(f), &old_termios) >= 0) {
1686 new_termios = old_termios;
1688 new_termios.c_lflag &= ~ICANON;
1689 new_termios.c_cc[VMIN] = 1;
1690 new_termios.c_cc[VTIME] = 0;
1692 if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
1695 k = fread(&c, 1, 1, f);
1697 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
1703 *need_nl = c != '\n';
1710 if (!(fgets(line, sizeof(line), f)))
1715 if (strlen(line) != 1)
1725 int ask(char *ret, const char *replies, const char *text, ...) {
1734 bool need_nl = true;
1736 fputs("\x1B[1m", stdout);
1742 fputs("\x1B[0m", stdout);
1746 if ((r = read_one_char(stdin, &c, &need_nl)) < 0) {
1748 if (r == -EBADMSG) {
1749 puts("Bad input, please try again.");
1760 if (strchr(replies, c)) {
1765 puts("Read unexpected character, please try again.");
1769 int reset_terminal(int fd) {
1770 struct termios termios;
1775 /* Set terminal to some sane defaults */
1777 if (tcgetattr(fd, &termios) < 0) {
1782 /* We only reset the stuff that matters to the software. How
1783 * hardware is set up we don't touch assuming that somebody
1784 * else will do that for us */
1786 termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
1787 termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
1788 termios.c_oflag |= ONLCR;
1789 termios.c_cflag |= CREAD;
1790 termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
1792 termios.c_cc[VINTR] = 03; /* ^C */
1793 termios.c_cc[VQUIT] = 034; /* ^\ */
1794 termios.c_cc[VERASE] = 0177;
1795 termios.c_cc[VKILL] = 025; /* ^X */
1796 termios.c_cc[VEOF] = 04; /* ^D */
1797 termios.c_cc[VSTART] = 021; /* ^Q */
1798 termios.c_cc[VSTOP] = 023; /* ^S */
1799 termios.c_cc[VSUSP] = 032; /* ^Z */
1800 termios.c_cc[VLNEXT] = 026; /* ^V */
1801 termios.c_cc[VWERASE] = 027; /* ^W */
1802 termios.c_cc[VREPRINT] = 022; /* ^R */
1803 termios.c_cc[VEOL] = 0;
1804 termios.c_cc[VEOL2] = 0;
1806 termios.c_cc[VTIME] = 0;
1807 termios.c_cc[VMIN] = 1;
1809 if (tcsetattr(fd, TCSANOW, &termios) < 0)
1813 /* Just in case, flush all crap out */
1814 tcflush(fd, TCIOFLUSH);
1819 int open_terminal(const char *name, int mode) {
1822 if ((fd = open(name, mode)) < 0)
1825 if ((r = isatty(fd)) < 0) {
1826 close_nointr_nofail(fd);
1831 close_nointr_nofail(fd);
1838 int flush_fd(int fd) {
1839 struct pollfd pollfd;
1843 pollfd.events = POLLIN;
1850 if ((r = poll(&pollfd, 1, 0)) < 0) {
1861 if ((l = read(fd, buf, sizeof(buf))) < 0) {
1866 if (errno == EAGAIN)
1877 int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm) {
1878 int fd = -1, notify = -1, r, wd = -1;
1882 /* We use inotify to be notified when the tty is closed. We
1883 * create the watch before checking if we can actually acquire
1884 * it, so that we don't lose any event.
1886 * Note: strictly speaking this actually watches for the
1887 * device being closed, it does *not* really watch whether a
1888 * tty loses its controlling process. However, unless some
1889 * rogue process uses TIOCNOTTY on /dev/tty *after* closing
1890 * its tty otherwise this will not become a problem. As long
1891 * as the administrator makes sure not configure any service
1892 * on the same tty as an untrusted user this should not be a
1893 * problem. (Which he probably should not do anyway.) */
1895 if (!fail && !force) {
1896 if ((notify = inotify_init1(IN_CLOEXEC)) < 0) {
1901 if ((wd = inotify_add_watch(notify, name, IN_CLOSE)) < 0) {
1909 if ((r = flush_fd(notify)) < 0)
1912 /* We pass here O_NOCTTY only so that we can check the return
1913 * value TIOCSCTTY and have a reliable way to figure out if we
1914 * successfully became the controlling process of the tty */
1915 if ((fd = open_terminal(name, O_RDWR|O_NOCTTY)) < 0)
1918 /* First, try to get the tty */
1919 r = ioctl(fd, TIOCSCTTY, force);
1921 /* Sometimes it makes sense to ignore TIOCSCTTY
1922 * returning EPERM, i.e. when very likely we already
1923 * are have this controlling terminal. */
1924 if (r < 0 && errno == EPERM && ignore_tiocstty_eperm)
1927 if (r < 0 && (force || fail || errno != EPERM)) {
1937 assert(notify >= 0);
1940 struct inotify_event e;
1943 if ((l = read(notify, &e, sizeof(e))) != sizeof(e)) {
1957 if (e.wd != wd || !(e.mask & IN_CLOSE)) {
1965 /* We close the tty fd here since if the old session
1966 * ended our handle will be dead. It's important that
1967 * we do this after sleeping, so that we don't enter
1968 * an endless loop. */
1969 close_nointr_nofail(fd);
1973 close_nointr_nofail(notify);
1975 if ((r = reset_terminal(fd)) < 0)
1976 log_warning("Failed to reset terminal: %s", strerror(-r));
1982 close_nointr_nofail(fd);
1985 close_nointr_nofail(notify);
1990 int release_terminal(void) {
1992 struct sigaction sa_old, sa_new;
1994 if ((fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY)) < 0)
1997 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
1998 * by our own TIOCNOTTY */
2001 sa_new.sa_handler = SIG_IGN;
2002 sa_new.sa_flags = SA_RESTART;
2003 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
2005 if (ioctl(fd, TIOCNOTTY) < 0)
2008 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
2010 close_nointr_nofail(fd);
2014 int sigaction_many(const struct sigaction *sa, ...) {
2019 while ((sig = va_arg(ap, int)) > 0)
2020 if (sigaction(sig, sa, NULL) < 0)
2027 int ignore_signals(int sig, ...) {
2028 struct sigaction sa;
2033 sa.sa_handler = SIG_IGN;
2034 sa.sa_flags = SA_RESTART;
2036 if (sigaction(sig, &sa, NULL) < 0)
2040 while ((sig = va_arg(ap, int)) > 0)
2041 if (sigaction(sig, &sa, NULL) < 0)
2048 int default_signals(int sig, ...) {
2049 struct sigaction sa;
2054 sa.sa_handler = SIG_DFL;
2055 sa.sa_flags = SA_RESTART;
2057 if (sigaction(sig, &sa, NULL) < 0)
2061 while ((sig = va_arg(ap, int)) > 0)
2062 if (sigaction(sig, &sa, NULL) < 0)
2069 int close_pipe(int p[]) {
2075 a = close_nointr(p[0]);
2080 b = close_nointr(p[1]);
2084 return a < 0 ? a : b;
2087 ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) {
2096 while (nbytes > 0) {
2099 if ((k = read(fd, p, nbytes)) <= 0) {
2101 if (k < 0 && errno == EINTR)
2104 if (k < 0 && errno == EAGAIN && do_poll) {
2105 struct pollfd pollfd;
2109 pollfd.events = POLLIN;
2111 if (poll(&pollfd, 1, -1) < 0) {
2115 return n > 0 ? n : -errno;
2118 if (pollfd.revents != POLLIN)
2119 return n > 0 ? n : -EIO;
2124 return n > 0 ? n : (k < 0 ? -errno : 0);
2135 ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) {
2144 while (nbytes > 0) {
2147 if ((k = write(fd, p, nbytes)) <= 0) {
2149 if (k < 0 && errno == EINTR)
2152 if (k < 0 && errno == EAGAIN && do_poll) {
2153 struct pollfd pollfd;
2157 pollfd.events = POLLOUT;
2159 if (poll(&pollfd, 1, -1) < 0) {
2163 return n > 0 ? n : -errno;
2166 if (pollfd.revents != POLLOUT)
2167 return n > 0 ? n : -EIO;
2172 return n > 0 ? n : (k < 0 ? -errno : 0);
2183 int path_is_mount_point(const char *t) {
2187 if (lstat(t, &a) < 0) {
2189 if (errno == ENOENT)
2195 if (!(copy = strdup(t)))
2198 if (lstat(dirname(copy), &b) < 0) {
2205 return a.st_dev != b.st_dev;
2208 int parse_usec(const char *t, usec_t *usec) {
2209 static const struct {
2213 { "sec", USEC_PER_SEC },
2214 { "s", USEC_PER_SEC },
2215 { "min", USEC_PER_MINUTE },
2216 { "hr", USEC_PER_HOUR },
2217 { "h", USEC_PER_HOUR },
2218 { "d", USEC_PER_DAY },
2219 { "w", USEC_PER_WEEK },
2220 { "msec", USEC_PER_MSEC },
2221 { "ms", USEC_PER_MSEC },
2222 { "m", USEC_PER_MINUTE },
2225 { "", USEC_PER_SEC },
2241 l = strtoll(p, &e, 10);
2252 e += strspn(e, WHITESPACE);
2254 for (i = 0; i < ELEMENTSOF(table); i++)
2255 if (startswith(e, table[i].suffix)) {
2256 r += (usec_t) l * table[i].usec;
2257 p = e + strlen(table[i].suffix);
2261 if (i >= ELEMENTSOF(table))
2271 int make_stdio(int fd) {
2276 r = dup2(fd, STDIN_FILENO);
2277 s = dup2(fd, STDOUT_FILENO);
2278 t = dup2(fd, STDERR_FILENO);
2281 close_nointr_nofail(fd);
2283 if (r < 0 || s < 0 || t < 0)
2289 bool is_clean_exit(int code, int status) {
2291 if (code == CLD_EXITED)
2294 /* If a daemon does not implement handlers for some of the
2295 * signals that's not considered an unclean shutdown */
2296 if (code == CLD_KILLED)
2300 status == SIGTERM ||
2306 bool is_device_path(const char *path) {
2308 /* Returns true on paths that refer to a device, either in
2309 * sysfs or in /dev */
2312 path_startswith(path, "/dev/") ||
2313 path_startswith(path, "/sys/");
2316 int dir_is_empty(const char *path) {
2319 struct dirent buf, *de;
2321 if (!(d = opendir(path)))
2325 if ((r = readdir_r(d, &buf, &de)) > 0) {
2335 if (!ignore_file(de->d_name)) {
2345 unsigned long long random_ull(void) {
2350 if ((fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY)) < 0)
2353 r = loop_read(fd, &ull, sizeof(ull), true);
2354 close_nointr_nofail(fd);
2356 if (r != sizeof(ull))
2362 return random() * RAND_MAX + random();
2365 void rename_process(const char name[8]) {
2368 prctl(PR_SET_NAME, name);
2370 /* This is a like a poor man's setproctitle(). The string
2371 * passed should fit in 7 chars (i.e. the length of
2374 if (program_invocation_name)
2375 strncpy(program_invocation_name, name, strlen(program_invocation_name));
2378 void sigset_add_many(sigset_t *ss, ...) {
2385 while ((sig = va_arg(ap, int)) > 0)
2386 assert_se(sigaddset(ss, sig) == 0);
2390 char* gethostname_malloc(void) {
2393 assert_se(uname(&u) >= 0);
2396 return strdup(u.nodename);
2398 return strdup(u.sysname);
2401 int getmachineid_malloc(char **b) {
2406 if ((r = read_one_line_file("/var/lib/dbus/machine-id", b)) < 0)
2413 char* getlogname_malloc(void) {
2417 struct passwd pwbuf, *pw = NULL;
2420 if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0)
2425 /* Shortcut things to avoid NSS lookups */
2427 return strdup("root");
2429 if ((bufsize = sysconf(_SC_GETPW_R_SIZE_MAX)) <= 0)
2432 if (!(buf = malloc(bufsize)))
2435 if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw) {
2436 name = strdup(pw->pw_name);
2443 if (asprintf(&name, "%lu", (unsigned long) uid) < 0)
2449 int getttyname_malloc(char **r) {
2450 char path[PATH_MAX], *p, *c;
2454 if (ttyname_r(STDIN_FILENO, path, sizeof(path)) < 0)
2460 if (startswith(path, "/dev/"))
2463 if (!(c = strdup(p)))
2470 static int rm_rf_children(int fd, bool only_dirs) {
2476 /* This returns the first error we run into, but nevertheless
2479 if (!(d = fdopendir(fd))) {
2480 close_nointr_nofail(fd);
2485 struct dirent buf, *de;
2489 if ((r = readdir_r(d, &buf, &de)) != 0) {
2498 if (streq(de->d_name, ".") || streq(de->d_name, ".."))
2501 if (de->d_type == DT_UNKNOWN) {
2504 if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
2510 is_dir = S_ISDIR(st.st_mode);
2512 is_dir = de->d_type == DT_DIR;
2517 if ((subdir_fd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)) < 0) {
2523 if ((r = rm_rf_children(subdir_fd, only_dirs)) < 0) {
2528 if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
2532 } else if (!only_dirs) {
2534 if (unlinkat(fd, de->d_name, 0) < 0) {
2546 int rm_rf(const char *path, bool only_dirs, bool delete_root) {
2552 if ((fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)) < 0) {
2554 if (errno != ENOTDIR)
2557 if (delete_root && !only_dirs)
2558 if (unlink(path) < 0)
2564 r = rm_rf_children(fd, only_dirs);
2567 if (rmdir(path) < 0) {
2575 int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
2578 /* Under the assumption that we are running privileged we
2579 * first change the access mode and only then hand out
2580 * ownership to avoid a window where access is too open. */
2582 if (chmod(path, mode) < 0)
2585 if (chown(path, uid, gid) < 0)
2591 cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
2595 /* Allocates the cpuset in the right size */
2598 if (!(r = CPU_ALLOC(n)))
2601 if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), r) >= 0) {
2602 CPU_ZERO_S(CPU_ALLOC_SIZE(n), r);
2612 if (errno != EINVAL)
2619 void status_vprintf(const char *format, va_list ap) {
2625 /* This independent of logging, as status messages are
2626 * optional and go exclusively to the console. */
2628 if (vasprintf(&s, format, ap) < 0)
2631 if ((fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0)
2634 write(fd, s, strlen(s));
2640 close_nointr_nofail(fd);
2643 void status_printf(const char *format, ...) {
2648 va_start(ap, format);
2649 status_vprintf(format, ap);
2653 void status_welcome(void) {
2655 #if defined(TARGET_FEDORA)
2658 if (read_one_line_file("/etc/system-release", &r) < 0)
2663 /* This tries to mimic the color magic the old Red Hat sysinit
2666 if (startswith(r, "Red Hat"))
2667 status_printf("Welcome to \x1B[0;31m%s\x1B[0m!\n", r); /* Red for RHEL */
2668 else if (startswith(r, "Fedora"))
2669 status_printf("Welcome to \x1B[0;34m%s\x1B[0m!\n", r); /* Blue for Fedora */
2671 status_printf("Welcome to %s!\n", r);
2675 #elif defined(TARGET_SUSE)
2678 if (read_one_line_file("/etc/SuSE-release", &r) < 0)
2683 status_printf("Welcome to \x1B[0;32m%s\x1B[0m!\n", r); /* Green for SUSE */
2686 #warning "You probably should add a welcome text logic here."
2690 static const char *const ioprio_class_table[] = {
2691 [IOPRIO_CLASS_NONE] = "none",
2692 [IOPRIO_CLASS_RT] = "realtime",
2693 [IOPRIO_CLASS_BE] = "best-effort",
2694 [IOPRIO_CLASS_IDLE] = "idle"
2697 DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int);
2699 static const char *const sigchld_code_table[] = {
2700 [CLD_EXITED] = "exited",
2701 [CLD_KILLED] = "killed",
2702 [CLD_DUMPED] = "dumped",
2703 [CLD_TRAPPED] = "trapped",
2704 [CLD_STOPPED] = "stopped",
2705 [CLD_CONTINUED] = "continued",
2708 DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
2710 static const char *const log_facility_table[LOG_NFACILITIES] = {
2711 [LOG_FAC(LOG_KERN)] = "kern",
2712 [LOG_FAC(LOG_USER)] = "user",
2713 [LOG_FAC(LOG_MAIL)] = "mail",
2714 [LOG_FAC(LOG_DAEMON)] = "daemon",
2715 [LOG_FAC(LOG_AUTH)] = "auth",
2716 [LOG_FAC(LOG_SYSLOG)] = "syslog",
2717 [LOG_FAC(LOG_LPR)] = "lpr",
2718 [LOG_FAC(LOG_NEWS)] = "news",
2719 [LOG_FAC(LOG_UUCP)] = "uucp",
2720 [LOG_FAC(LOG_CRON)] = "cron",
2721 [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
2722 [LOG_FAC(LOG_FTP)] = "ftp",
2723 [LOG_FAC(LOG_LOCAL0)] = "local0",
2724 [LOG_FAC(LOG_LOCAL1)] = "local1",
2725 [LOG_FAC(LOG_LOCAL2)] = "local2",
2726 [LOG_FAC(LOG_LOCAL3)] = "local3",
2727 [LOG_FAC(LOG_LOCAL4)] = "local4",
2728 [LOG_FAC(LOG_LOCAL5)] = "local5",
2729 [LOG_FAC(LOG_LOCAL6)] = "local6",
2730 [LOG_FAC(LOG_LOCAL7)] = "local7"
2733 DEFINE_STRING_TABLE_LOOKUP(log_facility, int);
2735 static const char *const log_level_table[] = {
2736 [LOG_EMERG] = "emerg",
2737 [LOG_ALERT] = "alert",
2738 [LOG_CRIT] = "crit",
2740 [LOG_WARNING] = "warning",
2741 [LOG_NOTICE] = "notice",
2742 [LOG_INFO] = "info",
2743 [LOG_DEBUG] = "debug"
2746 DEFINE_STRING_TABLE_LOOKUP(log_level, int);
2748 static const char* const sched_policy_table[] = {
2749 [SCHED_OTHER] = "other",
2750 [SCHED_BATCH] = "batch",
2751 [SCHED_IDLE] = "idle",
2752 [SCHED_FIFO] = "fifo",
2756 DEFINE_STRING_TABLE_LOOKUP(sched_policy, int);
2758 static const char* const rlimit_table[] = {
2759 [RLIMIT_CPU] = "LimitCPU",
2760 [RLIMIT_FSIZE] = "LimitFSIZE",
2761 [RLIMIT_DATA] = "LimitDATA",
2762 [RLIMIT_STACK] = "LimitSTACK",
2763 [RLIMIT_CORE] = "LimitCORE",
2764 [RLIMIT_RSS] = "LimitRSS",
2765 [RLIMIT_NOFILE] = "LimitNOFILE",
2766 [RLIMIT_AS] = "LimitAS",
2767 [RLIMIT_NPROC] = "LimitNPROC",
2768 [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
2769 [RLIMIT_LOCKS] = "LimitLOCKS",
2770 [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
2771 [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
2772 [RLIMIT_NICE] = "LimitNICE",
2773 [RLIMIT_RTPRIO] = "LimitRTPRIO",
2774 [RLIMIT_RTTIME] = "LimitRTTIME"
2777 DEFINE_STRING_TABLE_LOOKUP(rlimit, int);
2779 static const char* const ip_tos_table[] = {
2780 [IPTOS_LOWDELAY] = "low-delay",
2781 [IPTOS_THROUGHPUT] = "throughput",
2782 [IPTOS_RELIABILITY] = "reliability",
2783 [IPTOS_LOWCOST] = "low-cost",
2786 DEFINE_STRING_TABLE_LOOKUP(ip_tos, int);