1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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 Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser 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>
44 #include <sys/prctl.h>
45 #include <sys/utsname.h>
47 #include <netinet/ip.h>
55 #include <sys/mount.h>
56 #include <linux/magic.h>
60 #include <sys/personality.h>
61 #include <sys/xattr.h>
62 #include <sys/statvfs.h>
66 /* When we include libgen.h because we need dirname() we immediately
67 * undefine basename() since libgen.h defines it as a macro to the XDG
68 * version which is really broken. */
72 #ifdef HAVE_SYS_AUXV_H
84 #include "path-util.h"
85 #include "exit-status.h"
89 #include "device-nodes.h"
94 #include "sparse-endian.h"
96 /* Put this test here for a lack of better place */
97 assert_cc(EAGAIN == EWOULDBLOCK);
100 char **saved_argv = NULL;
102 static volatile unsigned cached_columns = 0;
103 static volatile unsigned cached_lines = 0;
105 size_t page_size(void) {
106 static thread_local size_t pgsz = 0;
109 if (_likely_(pgsz > 0))
112 r = sysconf(_SC_PAGESIZE);
119 bool streq_ptr(const char *a, const char *b) {
121 /* Like streq(), but tries to make sense of NULL pointers */
132 char* endswith(const char *s, const char *postfix) {
139 pl = strlen(postfix);
142 return (char*) s + sl;
147 if (memcmp(s + sl - pl, postfix, pl) != 0)
150 return (char*) s + sl - pl;
153 char* endswith_no_case(const char *s, const char *postfix) {
160 pl = strlen(postfix);
163 return (char*) s + sl;
168 if (strcasecmp(s + sl - pl, postfix) != 0)
171 return (char*) s + sl - pl;
174 char* first_word(const char *s, const char *word) {
181 /* Checks if the string starts with the specified word, either
182 * followed by NUL or by whitespace. Returns a pointer to the
183 * NUL or the first character after the whitespace. */
194 if (memcmp(s, word, wl) != 0)
201 if (!strchr(WHITESPACE, *p))
204 p += strspn(p, WHITESPACE);
208 static size_t cescape_char(char c, char *buf) {
209 char * buf_old = buf;
255 /* For special chars we prefer octal over
256 * hexadecimal encoding, simply because glib's
257 * g_strescape() does the same */
258 if ((c < ' ') || (c >= 127)) {
260 *(buf++) = octchar((unsigned char) c >> 6);
261 *(buf++) = octchar((unsigned char) c >> 3);
262 *(buf++) = octchar((unsigned char) c);
268 return buf - buf_old;
271 int close_nointr(int fd) {
278 * Just ignore EINTR; a retry loop is the wrong thing to do on
281 * http://lkml.indiana.edu/hypermail/linux/kernel/0509.1/0877.html
282 * https://bugzilla.gnome.org/show_bug.cgi?id=682819
283 * http://utcc.utoronto.ca/~cks/space/blog/unix/CloseEINTR
284 * https://sites.google.com/site/michaelsafyan/software-engineering/checkforeintrwheninvokingclosethinkagain
292 int safe_close(int fd) {
295 * Like close_nointr() but cannot fail. Guarantees errno is
296 * unchanged. Is a NOP with negative fds passed, and returns
297 * -1, so that it can be used in this syntax:
299 * fd = safe_close(fd);
305 /* The kernel might return pretty much any error code
306 * via close(), but the fd will be closed anyway. The
307 * only condition we want to check for here is whether
308 * the fd was invalid at all... */
310 assert_se(close_nointr(fd) != -EBADF);
316 void close_many(const int fds[], unsigned n_fd) {
319 assert(fds || n_fd <= 0);
321 for (i = 0; i < n_fd; i++)
325 int unlink_noerrno(const char *path) {
336 int parse_boolean(const char *v) {
339 if (streq(v, "1") || strcaseeq(v, "yes") || strcaseeq(v, "y") || strcaseeq(v, "true") || strcaseeq(v, "t") || strcaseeq(v, "on"))
341 else if (streq(v, "0") || strcaseeq(v, "no") || strcaseeq(v, "n") || strcaseeq(v, "false") || strcaseeq(v, "f") || strcaseeq(v, "off"))
347 int parse_pid(const char *s, pid_t* ret_pid) {
348 unsigned long ul = 0;
355 r = safe_atolu(s, &ul);
361 if ((unsigned long) pid != ul)
371 int parse_uid(const char *s, uid_t* ret_uid) {
372 unsigned long ul = 0;
379 r = safe_atolu(s, &ul);
385 if ((unsigned long) uid != ul)
388 /* Some libc APIs use UID_INVALID as special placeholder */
389 if (uid == (uid_t) 0xFFFFFFFF)
392 /* A long time ago UIDs where 16bit, hence explicitly avoid the 16bit -1 too */
393 if (uid == (uid_t) 0xFFFF)
400 int safe_atou(const char *s, unsigned *ret_u) {
408 l = strtoul(s, &x, 0);
410 if (!x || x == s || *x || errno)
411 return errno > 0 ? -errno : -EINVAL;
413 if ((unsigned long) (unsigned) l != l)
416 *ret_u = (unsigned) l;
420 int safe_atoi(const char *s, int *ret_i) {
428 l = strtol(s, &x, 0);
430 if (!x || x == s || *x || errno)
431 return errno > 0 ? -errno : -EINVAL;
433 if ((long) (int) l != l)
440 int safe_atou8(const char *s, uint8_t *ret) {
448 l = strtoul(s, &x, 0);
450 if (!x || x == s || *x || errno)
451 return errno > 0 ? -errno : -EINVAL;
453 if ((unsigned long) (uint8_t) l != l)
460 int safe_atou16(const char *s, uint16_t *ret) {
468 l = strtoul(s, &x, 0);
470 if (!x || x == s || *x || errno)
471 return errno > 0 ? -errno : -EINVAL;
473 if ((unsigned long) (uint16_t) l != l)
480 int safe_atoi16(const char *s, int16_t *ret) {
488 l = strtol(s, &x, 0);
490 if (!x || x == s || *x || errno)
491 return errno > 0 ? -errno : -EINVAL;
493 if ((long) (int16_t) l != l)
500 int safe_atollu(const char *s, long long unsigned *ret_llu) {
502 unsigned long long l;
508 l = strtoull(s, &x, 0);
510 if (!x || x == s || *x || errno)
511 return errno ? -errno : -EINVAL;
517 int safe_atolli(const char *s, long long int *ret_lli) {
525 l = strtoll(s, &x, 0);
527 if (!x || x == s || *x || errno)
528 return errno ? -errno : -EINVAL;
534 int safe_atod(const char *s, double *ret_d) {
542 loc = newlocale(LC_NUMERIC_MASK, "C", (locale_t) 0);
543 if (loc == (locale_t) 0)
547 d = strtod_l(s, &x, loc);
549 if (!x || x == s || *x || errno) {
551 return errno ? -errno : -EINVAL;
559 static size_t strcspn_escaped(const char *s, const char *reject) {
560 bool escaped = false;
563 for (n=0; s[n]; n++) {
566 else if (s[n] == '\\')
568 else if (strchr(reject, s[n]))
572 /* if s ends in \, return index of previous char */
576 /* Split a string into words. */
577 const char* split(const char **state, size_t *l, const char *separator, bool quoted) {
583 assert(**state == '\0');
587 current += strspn(current, separator);
593 if (quoted && strchr("\'\"", *current)) {
594 char quotechars[2] = {*current, '\0'};
596 *l = strcspn_escaped(current + 1, quotechars);
597 if (current[*l + 1] == '\0' ||
598 (current[*l + 2] && !strchr(separator, current[*l + 2]))) {
599 /* right quote missing or garbage at the end */
603 assert(current[*l + 1] == quotechars[0]);
604 *state = current++ + *l + 2;
606 *l = strcspn_escaped(current, separator);
607 if (current[*l] && !strchr(separator, current[*l])) {
608 /* unfinished escape */
612 *state = current + *l;
614 *l = strcspn(current, separator);
615 *state = current + *l;
621 int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
623 _cleanup_free_ char *line = NULL;
635 p = procfs_file_alloca(pid, "stat");
636 r = read_one_line_file(p, &line);
640 /* Let's skip the pid and comm fields. The latter is enclosed
641 * in () but does not escape any () in its value, so let's
642 * skip over it manually */
644 p = strrchr(line, ')');
656 if ((long unsigned) (pid_t) ppid != ppid)
659 *_ppid = (pid_t) ppid;
664 int fchmod_umask(int fd, mode_t m) {
669 r = fchmod(fd, m & (~u)) < 0 ? -errno : 0;
675 char *truncate_nl(char *s) {
678 s[strcspn(s, NEWLINE)] = 0;
682 int get_process_state(pid_t pid) {
686 _cleanup_free_ char *line = NULL;
690 p = procfs_file_alloca(pid, "stat");
691 r = read_one_line_file(p, &line);
695 p = strrchr(line, ')');
701 if (sscanf(p, " %c", &state) != 1)
704 return (unsigned char) state;
707 int get_process_comm(pid_t pid, char **name) {
714 p = procfs_file_alloca(pid, "comm");
716 r = read_one_line_file(p, name);
723 int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) {
724 _cleanup_fclose_ FILE *f = NULL;
732 p = procfs_file_alloca(pid, "cmdline");
738 if (max_length == 0) {
739 size_t len = 0, allocated = 0;
741 while ((c = getc(f)) != EOF) {
743 if (!GREEDY_REALLOC(r, allocated, len+2)) {
748 r[len++] = isprint(c) ? c : ' ';
758 r = new(char, max_length);
764 while ((c = getc(f)) != EOF) {
786 size_t n = MIN(left-1, 3U);
793 /* Kernel threads have no argv[] */
795 _cleanup_free_ char *t = NULL;
803 h = get_process_comm(pid, &t);
807 r = strjoin("[", t, "]", NULL);
816 int is_kernel_thread(pid_t pid) {
828 p = procfs_file_alloca(pid, "cmdline");
833 count = fread(&c, 1, 1, f);
837 /* Kernel threads have an empty cmdline */
840 return eof ? 1 : -errno;
845 int get_process_capeff(pid_t pid, char **capeff) {
851 p = procfs_file_alloca(pid, "status");
853 return get_status_field(p, "\nCapEff:", capeff);
856 static int get_process_link_contents(const char *proc_file, char **name) {
862 r = readlink_malloc(proc_file, name);
864 return r == -ENOENT ? -ESRCH : r;
869 int get_process_exe(pid_t pid, char **name) {
876 p = procfs_file_alloca(pid, "exe");
877 r = get_process_link_contents(p, name);
881 d = endswith(*name, " (deleted)");
888 static int get_process_id(pid_t pid, const char *field, uid_t *uid) {
889 _cleanup_fclose_ FILE *f = NULL;
899 p = procfs_file_alloca(pid, "status");
904 FOREACH_LINE(line, f, return -errno) {
909 if (startswith(l, field)) {
911 l += strspn(l, WHITESPACE);
913 l[strcspn(l, WHITESPACE)] = 0;
915 return parse_uid(l, uid);
922 int get_process_uid(pid_t pid, uid_t *uid) {
923 return get_process_id(pid, "Uid:", uid);
926 int get_process_gid(pid_t pid, gid_t *gid) {
927 assert_cc(sizeof(uid_t) == sizeof(gid_t));
928 return get_process_id(pid, "Gid:", gid);
931 int get_process_cwd(pid_t pid, char **cwd) {
936 p = procfs_file_alloca(pid, "cwd");
938 return get_process_link_contents(p, cwd);
941 int get_process_root(pid_t pid, char **root) {
946 p = procfs_file_alloca(pid, "root");
948 return get_process_link_contents(p, root);
951 int get_process_environ(pid_t pid, char **env) {
952 _cleanup_fclose_ FILE *f = NULL;
953 _cleanup_free_ char *outcome = NULL;
956 size_t allocated = 0, sz = 0;
961 p = procfs_file_alloca(pid, "environ");
967 while ((c = fgetc(f)) != EOF) {
968 if (!GREEDY_REALLOC(outcome, allocated, sz + 5))
972 outcome[sz++] = '\n';
974 sz += cescape_char(c, outcome + sz);
984 char *strnappend(const char *s, const char *suffix, size_t b) {
992 return strndup(suffix, b);
1001 if (b > ((size_t) -1) - a)
1004 r = new(char, a+b+1);
1009 memcpy(r+a, suffix, b);
1015 char *strappend(const char *s, const char *suffix) {
1016 return strnappend(s, suffix, suffix ? strlen(suffix) : 0);
1019 int readlinkat_malloc(int fd, const char *p, char **ret) {
1034 n = readlinkat(fd, p, c, l-1);
1041 if ((size_t) n < l-1) {
1052 int readlink_malloc(const char *p, char **ret) {
1053 return readlinkat_malloc(AT_FDCWD, p, ret);
1056 int readlink_value(const char *p, char **ret) {
1057 _cleanup_free_ char *link = NULL;
1061 r = readlink_malloc(p, &link);
1065 value = basename(link);
1069 value = strdup(value);
1078 int readlink_and_make_absolute(const char *p, char **r) {
1079 _cleanup_free_ char *target = NULL;
1086 j = readlink_malloc(p, &target);
1090 k = file_in_same_dir(p, target);
1098 int readlink_and_canonicalize(const char *p, char **r) {
1105 j = readlink_and_make_absolute(p, &t);
1109 s = canonicalize_file_name(t);
1116 path_kill_slashes(*r);
1121 int reset_all_signal_handlers(void) {
1124 for (sig = 1; sig < _NSIG; sig++) {
1125 struct sigaction sa = {
1126 .sa_handler = SIG_DFL,
1127 .sa_flags = SA_RESTART,
1130 /* These two cannot be caught... */
1131 if (sig == SIGKILL || sig == SIGSTOP)
1134 /* On Linux the first two RT signals are reserved by
1135 * glibc, and sigaction() will return EINVAL for them. */
1136 if ((sigaction(sig, &sa, NULL) < 0))
1137 if (errno != EINVAL && r == 0)
1144 int reset_signal_mask(void) {
1147 if (sigemptyset(&ss) < 0)
1150 if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0)
1156 char *strstrip(char *s) {
1159 /* Drops trailing whitespace. Modifies the string in
1160 * place. Returns pointer to first non-space character */
1162 s += strspn(s, WHITESPACE);
1164 for (e = strchr(s, 0); e > s; e --)
1165 if (!strchr(WHITESPACE, e[-1]))
1173 char *delete_chars(char *s, const char *bad) {
1176 /* Drops all whitespace, regardless where in the string */
1178 for (f = s, t = s; *f; f++) {
1179 if (strchr(bad, *f))
1190 char *file_in_same_dir(const char *path, const char *filename) {
1197 /* This removes the last component of path and appends
1198 * filename, unless the latter is absolute anyway or the
1201 if (path_is_absolute(filename))
1202 return strdup(filename);
1204 e = strrchr(path, '/');
1206 return strdup(filename);
1208 k = strlen(filename);
1209 ret = new(char, (e + 1 - path) + k + 1);
1213 memcpy(mempcpy(ret, path, e + 1 - path), filename, k + 1);
1217 int rmdir_parents(const char *path, const char *stop) {
1226 /* Skip trailing slashes */
1227 while (l > 0 && path[l-1] == '/')
1233 /* Skip last component */
1234 while (l > 0 && path[l-1] != '/')
1237 /* Skip trailing slashes */
1238 while (l > 0 && path[l-1] == '/')
1244 if (!(t = strndup(path, l)))
1247 if (path_startswith(stop, t)) {
1256 if (errno != ENOENT)
1263 char hexchar(int x) {
1264 static const char table[16] = "0123456789abcdef";
1266 return table[x & 15];
1269 int unhexchar(char c) {
1271 if (c >= '0' && c <= '9')
1274 if (c >= 'a' && c <= 'f')
1275 return c - 'a' + 10;
1277 if (c >= 'A' && c <= 'F')
1278 return c - 'A' + 10;
1283 char *hexmem(const void *p, size_t l) {
1287 z = r = malloc(l * 2 + 1);
1291 for (x = p; x < (const uint8_t*) p + l; x++) {
1292 *(z++) = hexchar(*x >> 4);
1293 *(z++) = hexchar(*x & 15);
1300 void *unhexmem(const char *p, size_t l) {
1306 z = r = malloc((l + 1) / 2 + 1);
1310 for (x = p; x < p + l; x += 2) {
1313 a = unhexchar(x[0]);
1315 b = unhexchar(x[1]);
1319 *(z++) = (uint8_t) a << 4 | (uint8_t) b;
1326 char octchar(int x) {
1327 return '0' + (x & 7);
1330 int unoctchar(char c) {
1332 if (c >= '0' && c <= '7')
1338 char decchar(int x) {
1339 return '0' + (x % 10);
1342 int undecchar(char c) {
1344 if (c >= '0' && c <= '9')
1350 char *cescape(const char *s) {
1356 /* Does C style string escaping. May be reversed with
1359 r = new(char, strlen(s)*4 + 1);
1363 for (f = s, t = r; *f; f++)
1364 t += cescape_char(*f, t);
1371 static int cunescape_one(const char *p, size_t length, char *ret, uint32_t *ret_unicode) {
1378 /* Unescapes C style. Returns the unescaped character in ret,
1379 * unless we encountered a \u sequence in which case the full
1380 * unicode character is returned in ret_unicode, instead. */
1382 if (length != (size_t) -1 && length < 1)
1419 /* This is an extension of the XDG syntax files */
1424 /* hexadecimal encoding */
1427 if (length != (size_t) -1 && length < 3)
1430 a = unhexchar(p[1]);
1434 b = unhexchar(p[2]);
1438 /* Don't allow NUL bytes */
1439 if (a == 0 && b == 0)
1442 *ret = (char) ((a << 4U) | b);
1448 /* C++11 style 16bit unicode */
1454 if (length != (size_t) -1 && length < 5)
1457 for (i = 0; i < 4; i++) {
1458 a[i] = unhexchar(p[1 + i]);
1463 c = ((uint32_t) a[0] << 12U) | ((uint32_t) a[1] << 8U) | ((uint32_t) a[2] << 4U) | (uint32_t) a[3];
1465 /* Don't allow 0 chars */
1484 /* C++11 style 32bit unicode */
1490 if (length != (size_t) -1 && length < 9)
1493 for (i = 0; i < 8; i++) {
1494 a[i] = unhexchar(p[1 + i]);
1499 c = ((uint32_t) a[0] << 28U) | ((uint32_t) a[1] << 24U) | ((uint32_t) a[2] << 20U) | ((uint32_t) a[3] << 16U) |
1500 ((uint32_t) a[4] << 12U) | ((uint32_t) a[5] << 8U) | ((uint32_t) a[6] << 4U) | (uint32_t) a[7];
1502 /* Don't allow 0 chars */
1506 /* Don't allow invalid code points */
1507 if (!unichar_is_valid(c))
1532 /* octal encoding */
1536 if (length != (size_t) -1 && length < 4)
1539 a = unoctchar(p[0]);
1543 b = unoctchar(p[1]);
1547 c = unoctchar(p[2]);
1551 /* don't allow NUL bytes */
1552 if (a == 0 && b == 0 && c == 0)
1555 /* Don't allow bytes above 255 */
1556 m = ((uint32_t) a << 6U) | ((uint32_t) b << 3U) | (uint32_t) c;
1572 int cunescape_length_with_prefix(const char *s, size_t length, const char *prefix, UnescapeFlags flags, char **ret) {
1580 /* Undoes C style string escaping, and optionally prefixes it. */
1582 pl = prefix ? strlen(prefix) : 0;
1584 r = new(char, pl+length+1);
1589 memcpy(r, prefix, pl);
1591 for (f = s, t = r + pl; f < s + length; f++) {
1597 remaining = s + length - f;
1598 assert(remaining > 0);
1601 /* A literal literal, copy verbatim */
1606 if (remaining == 1) {
1607 if (flags & UNESCAPE_RELAX) {
1608 /* A trailing backslash, copy verbatim */
1617 k = cunescape_one(f + 1, remaining - 1, &c, &u);
1619 if (flags & UNESCAPE_RELAX) {
1620 /* Invalid escape code, let's take it literal then */
1630 /* Non-Unicode? Let's encode this directly */
1633 /* Unicode? Then let's encode this in UTF-8 */
1634 t += utf8_encode_unichar(t, u);
1645 int cunescape_length(const char *s, size_t length, UnescapeFlags flags, char **ret) {
1646 return cunescape_length_with_prefix(s, length, NULL, flags, ret);
1649 int cunescape(const char *s, UnescapeFlags flags, char **ret) {
1650 return cunescape_length(s, strlen(s), flags, ret);
1653 char *xescape(const char *s, const char *bad) {
1657 /* Escapes all chars in bad, in addition to \ and all special
1658 * chars, in \xFF style escaping. May be reversed with
1661 r = new(char, strlen(s) * 4 + 1);
1665 for (f = s, t = r; *f; f++) {
1667 if ((*f < ' ') || (*f >= 127) ||
1668 (*f == '\\') || strchr(bad, *f)) {
1671 *(t++) = hexchar(*f >> 4);
1672 *(t++) = hexchar(*f);
1682 char *ascii_strlower(char *t) {
1687 for (p = t; *p; p++)
1688 if (*p >= 'A' && *p <= 'Z')
1689 *p = *p - 'A' + 'a';
1694 _pure_ static bool hidden_file_allow_backup(const char *filename) {
1698 filename[0] == '.' ||
1699 streq(filename, "lost+found") ||
1700 streq(filename, "aquota.user") ||
1701 streq(filename, "aquota.group") ||
1702 endswith(filename, ".rpmnew") ||
1703 endswith(filename, ".rpmsave") ||
1704 endswith(filename, ".rpmorig") ||
1705 endswith(filename, ".dpkg-old") ||
1706 endswith(filename, ".dpkg-new") ||
1707 endswith(filename, ".dpkg-tmp") ||
1708 endswith(filename, ".dpkg-dist") ||
1709 endswith(filename, ".dpkg-bak") ||
1710 endswith(filename, ".dpkg-backup") ||
1711 endswith(filename, ".dpkg-remove") ||
1712 endswith(filename, ".swp");
1715 bool hidden_file(const char *filename) {
1718 if (endswith(filename, "~"))
1721 return hidden_file_allow_backup(filename);
1724 int fd_nonblock(int fd, bool nonblock) {
1729 flags = fcntl(fd, F_GETFL, 0);
1734 nflags = flags | O_NONBLOCK;
1736 nflags = flags & ~O_NONBLOCK;
1738 if (nflags == flags)
1741 if (fcntl(fd, F_SETFL, nflags) < 0)
1747 int fd_cloexec(int fd, bool cloexec) {
1752 flags = fcntl(fd, F_GETFD, 0);
1757 nflags = flags | FD_CLOEXEC;
1759 nflags = flags & ~FD_CLOEXEC;
1761 if (nflags == flags)
1764 if (fcntl(fd, F_SETFD, nflags) < 0)
1770 _pure_ static bool fd_in_set(int fd, const int fdset[], unsigned n_fdset) {
1773 assert(n_fdset == 0 || fdset);
1775 for (i = 0; i < n_fdset; i++)
1782 int close_all_fds(const int except[], unsigned n_except) {
1783 _cleanup_closedir_ DIR *d = NULL;
1787 assert(n_except == 0 || except);
1789 d = opendir("/proc/self/fd");
1794 /* When /proc isn't available (for example in chroots)
1795 * the fallback is brute forcing through the fd
1798 assert_se(getrlimit(RLIMIT_NOFILE, &rl) >= 0);
1799 for (fd = 3; fd < (int) rl.rlim_max; fd ++) {
1801 if (fd_in_set(fd, except, n_except))
1804 if (close_nointr(fd) < 0)
1805 if (errno != EBADF && r == 0)
1812 while ((de = readdir(d))) {
1815 if (hidden_file(de->d_name))
1818 if (safe_atoi(de->d_name, &fd) < 0)
1819 /* Let's better ignore this, just in case */
1828 if (fd_in_set(fd, except, n_except))
1831 if (close_nointr(fd) < 0) {
1832 /* Valgrind has its own FD and doesn't want to have it closed */
1833 if (errno != EBADF && r == 0)
1841 bool chars_intersect(const char *a, const char *b) {
1844 /* Returns true if any of the chars in a are in b. */
1845 for (p = a; *p; p++)
1852 bool fstype_is_network(const char *fstype) {
1853 static const char table[] =
1868 x = startswith(fstype, "fuse.");
1872 return nulstr_contains(table, fstype);
1876 _cleanup_close_ int fd;
1878 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
1884 TIOCL_GETKMSGREDIRECT,
1888 if (ioctl(fd, TIOCLINUX, tiocl) < 0)
1891 vt = tiocl[0] <= 0 ? 1 : tiocl[0];
1894 if (ioctl(fd, VT_ACTIVATE, vt) < 0)
1900 int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
1901 struct termios old_termios, new_termios;
1902 char c, line[LINE_MAX];
1907 if (tcgetattr(fileno(f), &old_termios) >= 0) {
1908 new_termios = old_termios;
1910 new_termios.c_lflag &= ~ICANON;
1911 new_termios.c_cc[VMIN] = 1;
1912 new_termios.c_cc[VTIME] = 0;
1914 if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
1917 if (t != USEC_INFINITY) {
1918 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) {
1919 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
1924 k = fread(&c, 1, 1, f);
1926 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
1932 *need_nl = c != '\n';
1939 if (t != USEC_INFINITY) {
1940 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0)
1945 if (!fgets(line, sizeof(line), f))
1946 return errno ? -errno : -EIO;
1950 if (strlen(line) != 1)
1960 int ask_char(char *ret, const char *replies, const char *text, ...) {
1970 bool need_nl = true;
1973 fputs(ANSI_HIGHLIGHT_ON, stdout);
1980 fputs(ANSI_HIGHLIGHT_OFF, stdout);
1984 r = read_one_char(stdin, &c, USEC_INFINITY, &need_nl);
1987 if (r == -EBADMSG) {
1988 puts("Bad input, please try again.");
1999 if (strchr(replies, c)) {
2004 puts("Read unexpected character, please try again.");
2008 int ask_string(char **ret, const char *text, ...) {
2013 char line[LINE_MAX];
2017 fputs(ANSI_HIGHLIGHT_ON, stdout);
2024 fputs(ANSI_HIGHLIGHT_OFF, stdout);
2029 if (!fgets(line, sizeof(line), stdin))
2030 return errno ? -errno : -EIO;
2032 if (!endswith(line, "\n"))
2051 int reset_terminal_fd(int fd, bool switch_to_text) {
2052 struct termios termios;
2055 /* Set terminal to some sane defaults */
2059 /* We leave locked terminal attributes untouched, so that
2060 * Plymouth may set whatever it wants to set, and we don't
2061 * interfere with that. */
2063 /* Disable exclusive mode, just in case */
2064 ioctl(fd, TIOCNXCL);
2066 /* Switch to text mode */
2068 ioctl(fd, KDSETMODE, KD_TEXT);
2070 /* Enable console unicode mode */
2071 ioctl(fd, KDSKBMODE, K_UNICODE);
2073 if (tcgetattr(fd, &termios) < 0) {
2078 /* We only reset the stuff that matters to the software. How
2079 * hardware is set up we don't touch assuming that somebody
2080 * else will do that for us */
2082 termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
2083 termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
2084 termios.c_oflag |= ONLCR;
2085 termios.c_cflag |= CREAD;
2086 termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
2088 termios.c_cc[VINTR] = 03; /* ^C */
2089 termios.c_cc[VQUIT] = 034; /* ^\ */
2090 termios.c_cc[VERASE] = 0177;
2091 termios.c_cc[VKILL] = 025; /* ^X */
2092 termios.c_cc[VEOF] = 04; /* ^D */
2093 termios.c_cc[VSTART] = 021; /* ^Q */
2094 termios.c_cc[VSTOP] = 023; /* ^S */
2095 termios.c_cc[VSUSP] = 032; /* ^Z */
2096 termios.c_cc[VLNEXT] = 026; /* ^V */
2097 termios.c_cc[VWERASE] = 027; /* ^W */
2098 termios.c_cc[VREPRINT] = 022; /* ^R */
2099 termios.c_cc[VEOL] = 0;
2100 termios.c_cc[VEOL2] = 0;
2102 termios.c_cc[VTIME] = 0;
2103 termios.c_cc[VMIN] = 1;
2105 if (tcsetattr(fd, TCSANOW, &termios) < 0)
2109 /* Just in case, flush all crap out */
2110 tcflush(fd, TCIOFLUSH);
2115 int reset_terminal(const char *name) {
2116 _cleanup_close_ int fd = -1;
2118 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
2122 return reset_terminal_fd(fd, true);
2125 int open_terminal(const char *name, int mode) {
2130 * If a TTY is in the process of being closed opening it might
2131 * cause EIO. This is horribly awful, but unlikely to be
2132 * changed in the kernel. Hence we work around this problem by
2133 * retrying a couple of times.
2135 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
2138 assert(!(mode & O_CREAT));
2141 fd = open(name, mode, 0);
2148 /* Max 1s in total */
2152 usleep(50 * USEC_PER_MSEC);
2170 int flush_fd(int fd) {
2171 struct pollfd pollfd = {
2181 r = poll(&pollfd, 1, 0);
2191 l = read(fd, buf, sizeof(buf));
2197 if (errno == EAGAIN)
2206 int acquire_terminal(
2210 bool ignore_tiocstty_eperm,
2213 int fd = -1, notify = -1, r = 0, wd = -1;
2218 /* We use inotify to be notified when the tty is closed. We
2219 * create the watch before checking if we can actually acquire
2220 * it, so that we don't lose any event.
2222 * Note: strictly speaking this actually watches for the
2223 * device being closed, it does *not* really watch whether a
2224 * tty loses its controlling process. However, unless some
2225 * rogue process uses TIOCNOTTY on /dev/tty *after* closing
2226 * its tty otherwise this will not become a problem. As long
2227 * as the administrator makes sure not configure any service
2228 * on the same tty as an untrusted user this should not be a
2229 * problem. (Which he probably should not do anyway.) */
2231 if (timeout != USEC_INFINITY)
2232 ts = now(CLOCK_MONOTONIC);
2234 if (!fail && !force) {
2235 notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0));
2241 wd = inotify_add_watch(notify, name, IN_CLOSE);
2249 struct sigaction sa_old, sa_new = {
2250 .sa_handler = SIG_IGN,
2251 .sa_flags = SA_RESTART,
2255 r = flush_fd(notify);
2260 /* We pass here O_NOCTTY only so that we can check the return
2261 * value TIOCSCTTY and have a reliable way to figure out if we
2262 * successfully became the controlling process of the tty */
2263 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
2267 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
2268 * if we already own the tty. */
2269 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
2271 /* First, try to get the tty */
2272 if (ioctl(fd, TIOCSCTTY, force) < 0)
2275 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
2277 /* Sometimes it makes sense to ignore TIOCSCTTY
2278 * returning EPERM, i.e. when very likely we already
2279 * are have this controlling terminal. */
2280 if (r < 0 && r == -EPERM && ignore_tiocstty_eperm)
2283 if (r < 0 && (force || fail || r != -EPERM)) {
2292 assert(notify >= 0);
2295 union inotify_event_buffer buffer;
2296 struct inotify_event *e;
2299 if (timeout != USEC_INFINITY) {
2302 n = now(CLOCK_MONOTONIC);
2303 if (ts + timeout < n) {
2308 r = fd_wait_for_event(fd, POLLIN, ts + timeout - n);
2318 l = read(notify, &buffer, sizeof(buffer));
2320 if (errno == EINTR || errno == EAGAIN)
2327 FOREACH_INOTIFY_EVENT(e, buffer, l) {
2328 if (e->wd != wd || !(e->mask & IN_CLOSE)) {
2337 /* We close the tty fd here since if the old session
2338 * ended our handle will be dead. It's important that
2339 * we do this after sleeping, so that we don't enter
2340 * an endless loop. */
2341 fd = safe_close(fd);
2346 r = reset_terminal_fd(fd, true);
2348 log_warning_errno(r, "Failed to reset terminal: %m");
2359 int release_terminal(void) {
2360 static const struct sigaction sa_new = {
2361 .sa_handler = SIG_IGN,
2362 .sa_flags = SA_RESTART,
2365 _cleanup_close_ int fd = -1;
2366 struct sigaction sa_old;
2369 fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC);
2373 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
2374 * by our own TIOCNOTTY */
2375 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
2377 if (ioctl(fd, TIOCNOTTY) < 0)
2380 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
2385 int sigaction_many(const struct sigaction *sa, ...) {
2390 while ((sig = va_arg(ap, int)) > 0)
2391 if (sigaction(sig, sa, NULL) < 0)
2398 int ignore_signals(int sig, ...) {
2399 struct sigaction sa = {
2400 .sa_handler = SIG_IGN,
2401 .sa_flags = SA_RESTART,
2406 if (sigaction(sig, &sa, NULL) < 0)
2410 while ((sig = va_arg(ap, int)) > 0)
2411 if (sigaction(sig, &sa, NULL) < 0)
2418 int default_signals(int sig, ...) {
2419 struct sigaction sa = {
2420 .sa_handler = SIG_DFL,
2421 .sa_flags = SA_RESTART,
2426 if (sigaction(sig, &sa, NULL) < 0)
2430 while ((sig = va_arg(ap, int)) > 0)
2431 if (sigaction(sig, &sa, NULL) < 0)
2438 void safe_close_pair(int p[]) {
2442 /* Special case pairs which use the same fd in both
2444 p[0] = p[1] = safe_close(p[0]);
2448 p[0] = safe_close(p[0]);
2449 p[1] = safe_close(p[1]);
2452 ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) {
2459 while (nbytes > 0) {
2462 k = read(fd, p, nbytes);
2467 if (errno == EAGAIN && do_poll) {
2469 /* We knowingly ignore any return value here,
2470 * and expect that any error/EOF is reported
2473 fd_wait_for_event(fd, POLLIN, USEC_INFINITY);
2477 return n > 0 ? n : -errno;
2491 int loop_read_exact(int fd, void *buf, size_t nbytes, bool do_poll) {
2494 n = loop_read(fd, buf, nbytes, do_poll);
2497 if ((size_t) n != nbytes)
2502 int loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) {
2503 const uint8_t *p = buf;
2510 while (nbytes > 0) {
2513 k = write(fd, p, nbytes);
2518 if (errno == EAGAIN && do_poll) {
2519 /* We knowingly ignore any return value here,
2520 * and expect that any error/EOF is reported
2523 fd_wait_for_event(fd, POLLOUT, USEC_INFINITY);
2530 if (k == 0) /* Can't really happen */
2540 int parse_size(const char *t, off_t base, off_t *size) {
2542 /* Soo, sometimes we want to parse IEC binary suffxies, and
2543 * sometimes SI decimal suffixes. This function can parse
2544 * both. Which one is the right way depends on the
2545 * context. Wikipedia suggests that SI is customary for
2546 * hardrware metrics and network speeds, while IEC is
2547 * customary for most data sizes used by software and volatile
2548 * (RAM) memory. Hence be careful which one you pick!
2550 * In either case we use just K, M, G as suffix, and not Ki,
2551 * Mi, Gi or so (as IEC would suggest). That's because that's
2552 * frickin' ugly. But this means you really need to make sure
2553 * to document which base you are parsing when you use this
2558 unsigned long long factor;
2561 static const struct table iec[] = {
2562 { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
2563 { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
2564 { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
2565 { "G", 1024ULL*1024ULL*1024ULL },
2566 { "M", 1024ULL*1024ULL },
2572 static const struct table si[] = {
2573 { "E", 1000ULL*1000ULL*1000ULL*1000ULL*1000ULL*1000ULL },
2574 { "P", 1000ULL*1000ULL*1000ULL*1000ULL*1000ULL },
2575 { "T", 1000ULL*1000ULL*1000ULL*1000ULL },
2576 { "G", 1000ULL*1000ULL*1000ULL },
2577 { "M", 1000ULL*1000ULL },
2583 const struct table *table;
2585 unsigned long long r = 0;
2586 unsigned n_entries, start_pos = 0;
2589 assert(base == 1000 || base == 1024);
2594 n_entries = ELEMENTSOF(si);
2597 n_entries = ELEMENTSOF(iec);
2603 unsigned long long l2;
2609 l = strtoll(p, &e, 10);
2622 if (*e >= '0' && *e <= '9') {
2625 /* strotoull itself would accept space/+/- */
2626 l2 = strtoull(e, &e2, 10);
2628 if (errno == ERANGE)
2631 /* Ignore failure. E.g. 10.M is valid */
2638 e += strspn(e, WHITESPACE);
2640 for (i = start_pos; i < n_entries; i++)
2641 if (startswith(e, table[i].suffix)) {
2642 unsigned long long tmp;
2643 if ((unsigned long long) l + (frac > 0) > ULLONG_MAX / table[i].factor)
2645 tmp = l * table[i].factor + (unsigned long long) (frac * table[i].factor);
2646 if (tmp > ULLONG_MAX - r)
2650 if ((unsigned long long) (off_t) r != r)
2653 p = e + strlen(table[i].suffix);
2669 int make_stdio(int fd) {
2674 r = dup2(fd, STDIN_FILENO);
2675 s = dup2(fd, STDOUT_FILENO);
2676 t = dup2(fd, STDERR_FILENO);
2681 if (r < 0 || s < 0 || t < 0)
2684 /* Explicitly unset O_CLOEXEC, since if fd was < 3, then
2685 * dup2() was a NOP and the bit hence possibly set. */
2686 fd_cloexec(STDIN_FILENO, false);
2687 fd_cloexec(STDOUT_FILENO, false);
2688 fd_cloexec(STDERR_FILENO, false);
2693 int make_null_stdio(void) {
2696 null_fd = open("/dev/null", O_RDWR|O_NOCTTY);
2700 return make_stdio(null_fd);
2703 bool is_device_path(const char *path) {
2705 /* Returns true on paths that refer to a device, either in
2706 * sysfs or in /dev */
2709 path_startswith(path, "/dev/") ||
2710 path_startswith(path, "/sys/");
2713 int dir_is_empty(const char *path) {
2714 _cleanup_closedir_ DIR *d;
2725 if (!de && errno != 0)
2731 if (!hidden_file(de->d_name))
2736 char* dirname_malloc(const char *path) {
2737 char *d, *dir, *dir2;
2754 int dev_urandom(void *p, size_t n) {
2755 static int have_syscall = -1;
2757 _cleanup_close_ int fd = -1;
2760 /* Gathers some randomness from the kernel. This call will
2761 * never block, and will always return some data from the
2762 * kernel, regardless if the random pool is fully initialized
2763 * or not. It thus makes no guarantee for the quality of the
2764 * returned entropy, but is good enough for or usual usecases
2765 * of seeding the hash functions for hashtable */
2767 /* Use the getrandom() syscall unless we know we don't have
2768 * it, or when the requested size is too large for it. */
2769 if (have_syscall != 0 || (size_t) (int) n != n) {
2770 r = getrandom(p, n, GRND_NONBLOCK);
2772 have_syscall = true;
2777 if (errno == ENOSYS)
2778 /* we lack the syscall, continue with
2779 * reading from /dev/urandom */
2780 have_syscall = false;
2781 else if (errno == EAGAIN)
2782 /* not enough entropy for now. Let's
2783 * remember to use the syscall the
2784 * next time, again, but also read
2785 * from /dev/urandom for now, which
2786 * doesn't care about the current
2787 * amount of entropy. */
2788 have_syscall = true;
2792 /* too short read? */
2796 fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY);
2798 return errno == ENOENT ? -ENOSYS : -errno;
2800 return loop_read_exact(fd, p, n, true);
2803 void initialize_srand(void) {
2804 static bool srand_called = false;
2806 #ifdef HAVE_SYS_AUXV_H
2815 #ifdef HAVE_SYS_AUXV_H
2816 /* The kernel provides us with a bit of entropy in auxv, so
2817 * let's try to make use of that to seed the pseudo-random
2818 * generator. It's better than nothing... */
2820 auxv = (void*) getauxval(AT_RANDOM);
2822 x ^= *(unsigned*) auxv;
2825 x ^= (unsigned) now(CLOCK_REALTIME);
2826 x ^= (unsigned) gettid();
2829 srand_called = true;
2832 void random_bytes(void *p, size_t n) {
2836 r = dev_urandom(p, n);
2840 /* If some idiot made /dev/urandom unavailable to us, he'll
2841 * get a PRNG instead. */
2845 for (q = p; q < (uint8_t*) p + n; q ++)
2849 void rename_process(const char name[8]) {
2852 /* This is a like a poor man's setproctitle(). It changes the
2853 * comm field, argv[0], and also the glibc's internally used
2854 * name of the process. For the first one a limit of 16 chars
2855 * applies, to the second one usually one of 10 (i.e. length
2856 * of "/sbin/init"), to the third one one of 7 (i.e. length of
2857 * "systemd"). If you pass a longer string it will be
2860 prctl(PR_SET_NAME, name);
2862 if (program_invocation_name)
2863 strncpy(program_invocation_name, name, strlen(program_invocation_name));
2865 if (saved_argc > 0) {
2869 strncpy(saved_argv[0], name, strlen(saved_argv[0]));
2871 for (i = 1; i < saved_argc; i++) {
2875 memzero(saved_argv[i], strlen(saved_argv[i]));
2880 void sigset_add_many(sigset_t *ss, ...) {
2887 while ((sig = va_arg(ap, int)) > 0)
2888 assert_se(sigaddset(ss, sig) == 0);
2892 int sigprocmask_many(int how, ...) {
2897 assert_se(sigemptyset(&ss) == 0);
2900 while ((sig = va_arg(ap, int)) > 0)
2901 assert_se(sigaddset(&ss, sig) == 0);
2904 if (sigprocmask(how, &ss, NULL) < 0)
2910 char* gethostname_malloc(void) {
2913 assert_se(uname(&u) >= 0);
2915 if (!isempty(u.nodename) && !streq(u.nodename, "(none)"))
2916 return strdup(u.nodename);
2918 return strdup(u.sysname);
2921 bool hostname_is_set(void) {
2924 assert_se(uname(&u) >= 0);
2926 return !isempty(u.nodename) && !streq(u.nodename, "(none)");
2929 char *lookup_uid(uid_t uid) {
2932 _cleanup_free_ char *buf = NULL;
2933 struct passwd pwbuf, *pw = NULL;
2935 /* Shortcut things to avoid NSS lookups */
2937 return strdup("root");
2939 bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
2943 buf = malloc(bufsize);
2947 if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw)
2948 return strdup(pw->pw_name);
2950 if (asprintf(&name, UID_FMT, uid) < 0)
2956 char* getlogname_malloc(void) {
2960 if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0)
2965 return lookup_uid(uid);
2968 char *getusername_malloc(void) {
2975 return lookup_uid(getuid());
2978 int getttyname_malloc(int fd, char **ret) {
2988 r = ttyname_r(fd, path, sizeof(path));
2993 p = startswith(path, "/dev/");
2994 c = strdup(p ?: path);
3011 int getttyname_harder(int fd, char **r) {
3015 k = getttyname_malloc(fd, &s);
3019 if (streq(s, "tty")) {
3021 return get_ctty(0, NULL, r);
3028 int get_ctty_devnr(pid_t pid, dev_t *d) {
3030 _cleanup_free_ char *line = NULL;
3032 unsigned long ttynr;
3036 p = procfs_file_alloca(pid, "stat");
3037 r = read_one_line_file(p, &line);
3041 p = strrchr(line, ')');
3051 "%*d " /* session */
3056 if (major(ttynr) == 0 && minor(ttynr) == 0)
3065 int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
3066 char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL;
3067 _cleanup_free_ char *s = NULL;
3074 k = get_ctty_devnr(pid, &devnr);
3078 sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr));
3080 k = readlink_malloc(fn, &s);
3086 /* This is an ugly hack */
3087 if (major(devnr) == 136) {
3088 if (asprintf(&b, "pts/%u", minor(devnr)) < 0)
3091 /* Probably something like the ptys which have no
3092 * symlink in /dev/char. Let's return something
3093 * vaguely useful. */
3100 if (startswith(s, "/dev/"))
3102 else if (startswith(s, "../"))
3119 bool is_temporary_fs(const struct statfs *s) {
3122 return F_TYPE_EQUAL(s->f_type, TMPFS_MAGIC) ||
3123 F_TYPE_EQUAL(s->f_type, RAMFS_MAGIC);
3126 int fd_is_temporary_fs(int fd) {
3129 if (fstatfs(fd, &s) < 0)
3132 return is_temporary_fs(&s);
3135 int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
3138 /* Under the assumption that we are running privileged we
3139 * first change the access mode and only then hand out
3140 * ownership to avoid a window where access is too open. */
3142 if (mode != MODE_INVALID)
3143 if (chmod(path, mode) < 0)
3146 if (uid != UID_INVALID || gid != GID_INVALID)
3147 if (chown(path, uid, gid) < 0)
3153 int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid) {
3156 /* Under the assumption that we are running privileged we
3157 * first change the access mode and only then hand out
3158 * ownership to avoid a window where access is too open. */
3160 if (mode != MODE_INVALID)
3161 if (fchmod(fd, mode) < 0)
3164 if (uid != UID_INVALID || gid != GID_INVALID)
3165 if (fchown(fd, uid, gid) < 0)
3171 cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
3175 /* Allocates the cpuset in the right size */
3178 if (!(r = CPU_ALLOC(n)))
3181 if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), r) >= 0) {
3182 CPU_ZERO_S(CPU_ALLOC_SIZE(n), r);
3192 if (errno != EINVAL)
3199 int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) {
3200 static const char status_indent[] = " "; /* "[" STATUS "] " */
3201 _cleanup_free_ char *s = NULL;
3202 _cleanup_close_ int fd = -1;
3203 struct iovec iovec[6] = {};
3205 static bool prev_ephemeral;
3209 /* This is independent of logging, as status messages are
3210 * optional and go exclusively to the console. */
3212 if (vasprintf(&s, format, ap) < 0)
3215 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
3228 sl = status ? sizeof(status_indent)-1 : 0;
3234 e = ellipsize(s, emax, 50);
3242 IOVEC_SET_STRING(iovec[n++], "\r" ANSI_ERASE_TO_END_OF_LINE);
3243 prev_ephemeral = ephemeral;
3246 if (!isempty(status)) {
3247 IOVEC_SET_STRING(iovec[n++], "[");
3248 IOVEC_SET_STRING(iovec[n++], status);
3249 IOVEC_SET_STRING(iovec[n++], "] ");
3251 IOVEC_SET_STRING(iovec[n++], status_indent);
3254 IOVEC_SET_STRING(iovec[n++], s);
3256 IOVEC_SET_STRING(iovec[n++], "\n");
3258 if (writev(fd, iovec, n) < 0)
3264 int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) {
3270 va_start(ap, format);
3271 r = status_vprintf(status, ellipse, ephemeral, format, ap);
3277 char *replace_env(const char *format, char **env) {
3284 const char *e, *word = format;
3289 for (e = format; *e; e ++) {
3300 k = strnappend(r, word, e-word-1);
3310 } else if (*e == '$') {
3311 k = strnappend(r, word, e-word);
3328 t = strempty(strv_env_get_n(env, word+2, e-word-2));
3330 k = strappend(r, t);
3344 k = strnappend(r, word, e-word);
3356 char **replace_env_argv(char **argv, char **env) {
3358 unsigned k = 0, l = 0;
3360 l = strv_length(argv);
3362 ret = new(char*, l+1);
3366 STRV_FOREACH(i, argv) {
3368 /* If $FOO appears as single word, replace it by the split up variable */
3369 if ((*i)[0] == '$' && (*i)[1] != '{') {
3371 char **w, **m = NULL;
3374 e = strv_env_get(env, *i+1);
3378 r = strv_split_quoted(&m, e, UNQUOTE_RELAX);
3390 w = realloc(ret, sizeof(char*) * (l+1));
3400 memcpy(ret + k, m, q * sizeof(char*));
3408 /* If ${FOO} appears as part of a word, replace it by the variable as-is */
3409 ret[k] = replace_env(*i, env);
3421 int fd_columns(int fd) {
3422 struct winsize ws = {};
3424 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
3433 unsigned columns(void) {
3437 if (_likely_(cached_columns > 0))
3438 return cached_columns;
3441 e = getenv("COLUMNS");
3443 (void) safe_atoi(e, &c);
3446 c = fd_columns(STDOUT_FILENO);
3452 return cached_columns;
3455 int fd_lines(int fd) {
3456 struct winsize ws = {};
3458 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
3467 unsigned lines(void) {
3471 if (_likely_(cached_lines > 0))
3472 return cached_lines;
3475 e = getenv("LINES");
3477 (void) safe_atoi(e, &l);
3480 l = fd_lines(STDOUT_FILENO);
3486 return cached_lines;
3489 /* intended to be used as a SIGWINCH sighandler */
3490 void columns_lines_cache_reset(int signum) {
3496 static int cached_on_tty = -1;
3498 if (_unlikely_(cached_on_tty < 0))
3499 cached_on_tty = isatty(STDOUT_FILENO) > 0;
3501 return cached_on_tty;
3504 int files_same(const char *filea, const char *fileb) {
3507 if (stat(filea, &a) < 0)
3510 if (stat(fileb, &b) < 0)
3513 return a.st_dev == b.st_dev &&
3514 a.st_ino == b.st_ino;
3517 int running_in_chroot(void) {
3520 ret = files_same("/proc/1/root", "/");
3527 static char *ascii_ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
3532 assert(percent <= 100);
3533 assert(new_length >= 3);
3535 if (old_length <= 3 || old_length <= new_length)
3536 return strndup(s, old_length);
3538 r = new0(char, new_length+1);
3542 x = (new_length * percent) / 100;
3544 if (x > new_length - 3)
3552 s + old_length - (new_length - x - 3),
3553 new_length - x - 3);
3558 char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
3562 unsigned k, len, len2;
3565 assert(percent <= 100);
3566 assert(new_length >= 3);
3568 /* if no multibyte characters use ascii_ellipsize_mem for speed */
3569 if (ascii_is_valid(s))
3570 return ascii_ellipsize_mem(s, old_length, new_length, percent);
3572 if (old_length <= 3 || old_length <= new_length)
3573 return strndup(s, old_length);
3575 x = (new_length * percent) / 100;
3577 if (x > new_length - 3)
3581 for (i = s; k < x && i < s + old_length; i = utf8_next_char(i)) {
3584 c = utf8_encoded_to_unichar(i);
3587 k += unichar_iswide(c) ? 2 : 1;
3590 if (k > x) /* last character was wide and went over quota */
3593 for (j = s + old_length; k < new_length && j > i; ) {
3596 j = utf8_prev_char(j);
3597 c = utf8_encoded_to_unichar(j);
3600 k += unichar_iswide(c) ? 2 : 1;
3604 /* we don't actually need to ellipsize */
3606 return memdup(s, old_length + 1);
3608 /* make space for ellipsis */
3609 j = utf8_next_char(j);
3612 len2 = s + old_length - j;
3613 e = new(char, len + 3 + len2 + 1);
3618 printf("old_length=%zu new_length=%zu x=%zu len=%u len2=%u k=%u\n",
3619 old_length, new_length, x, len, len2, k);
3623 e[len] = 0xe2; /* tri-dot ellipsis: … */
3627 memcpy(e + len + 3, j, len2 + 1);
3632 char *ellipsize(const char *s, size_t length, unsigned percent) {
3633 return ellipsize_mem(s, strlen(s), length, percent);
3636 int touch_file(const char *path, bool parents, usec_t stamp, uid_t uid, gid_t gid, mode_t mode) {
3637 _cleanup_close_ int fd;
3643 mkdir_parents(path, 0755);
3645 fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode > 0 ? mode : 0644);
3650 r = fchmod(fd, mode);
3655 if (uid != UID_INVALID || gid != GID_INVALID) {
3656 r = fchown(fd, uid, gid);
3661 if (stamp != USEC_INFINITY) {
3662 struct timespec ts[2];
3664 timespec_store(&ts[0], stamp);
3666 r = futimens(fd, ts);
3668 r = futimens(fd, NULL);
3675 int touch(const char *path) {
3676 return touch_file(path, false, USEC_INFINITY, UID_INVALID, GID_INVALID, 0);
3679 char *unquote(const char *s, const char* quotes) {
3683 /* This is rather stupid, simply removes the heading and
3684 * trailing quotes if there is one. Doesn't care about
3685 * escaping or anything. We should make this smarter one
3692 if (strchr(quotes, s[0]) && s[l-1] == s[0])
3693 return strndup(s+1, l-2);
3698 char *normalize_env_assignment(const char *s) {
3699 _cleanup_free_ char *value = NULL;
3703 eq = strchr(s, '=');
3713 memmove(r, t, strlen(t) + 1);
3718 name = strndupa(s, eq - s);
3719 p = strdupa(eq + 1);
3721 value = unquote(strstrip(p), QUOTES);
3725 return strjoin(strstrip(name), "=", value, NULL);
3728 int wait_for_terminate(pid_t pid, siginfo_t *status) {
3739 if (waitid(P_PID, pid, status, WEXITED) < 0) {
3753 * < 0 : wait_for_terminate() failed to get the state of the
3754 * process, the process was terminated by a signal, or
3755 * failed for an unknown reason.
3756 * >=0 : The process terminated normally, and its exit code is
3759 * That is, success is indicated by a return value of zero, and an
3760 * error is indicated by a non-zero value.
3762 * A warning is emitted if the process terminates abnormally,
3763 * and also if it returns non-zero unless check_exit_code is true.
3765 int wait_for_terminate_and_warn(const char *name, pid_t pid, bool check_exit_code) {
3772 r = wait_for_terminate(pid, &status);
3774 return log_warning_errno(r, "Failed to wait for %s: %m", name);
3776 if (status.si_code == CLD_EXITED) {
3777 if (status.si_status != 0)
3778 log_full(check_exit_code ? LOG_WARNING : LOG_DEBUG,
3779 "%s failed with error code %i.", name, status.si_status);
3781 log_debug("%s succeeded.", name);
3783 return status.si_status;
3784 } else if (status.si_code == CLD_KILLED ||
3785 status.si_code == CLD_DUMPED) {
3787 log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
3791 log_warning("%s failed due to unknown reason.", name);
3795 noreturn void freeze(void) {
3797 /* Make sure nobody waits for us on a socket anymore */
3798 close_all_fds(NULL, 0);
3806 bool null_or_empty(struct stat *st) {
3809 if (S_ISREG(st->st_mode) && st->st_size <= 0)
3812 if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode))
3818 int null_or_empty_path(const char *fn) {
3823 if (stat(fn, &st) < 0)
3826 return null_or_empty(&st);
3829 int null_or_empty_fd(int fd) {
3834 if (fstat(fd, &st) < 0)
3837 return null_or_empty(&st);
3840 DIR *xopendirat(int fd, const char *name, int flags) {
3844 assert(!(flags & O_CREAT));
3846 nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0);
3859 int signal_from_string_try_harder(const char *s) {
3863 signo = signal_from_string(s);
3865 if (startswith(s, "SIG"))
3866 return signal_from_string(s+3);
3871 static char *tag_to_udev_node(const char *tagvalue, const char *by) {
3872 _cleanup_free_ char *t = NULL, *u = NULL;
3875 u = unquote(tagvalue, "\"\'");
3879 enc_len = strlen(u) * 4 + 1;
3880 t = new(char, enc_len);
3884 if (encode_devnode_name(u, t, enc_len) < 0)
3887 return strjoin("/dev/disk/by-", by, "/", t, NULL);
3890 char *fstab_node_to_udev_node(const char *p) {
3893 if (startswith(p, "LABEL="))
3894 return tag_to_udev_node(p+6, "label");
3896 if (startswith(p, "UUID="))
3897 return tag_to_udev_node(p+5, "uuid");
3899 if (startswith(p, "PARTUUID="))
3900 return tag_to_udev_node(p+9, "partuuid");
3902 if (startswith(p, "PARTLABEL="))
3903 return tag_to_udev_node(p+10, "partlabel");
3908 bool tty_is_vc(const char *tty) {
3911 return vtnr_from_tty(tty) >= 0;
3914 bool tty_is_console(const char *tty) {
3917 if (startswith(tty, "/dev/"))
3920 return streq(tty, "console");
3923 int vtnr_from_tty(const char *tty) {
3928 if (startswith(tty, "/dev/"))
3931 if (!startswith(tty, "tty") )
3934 if (tty[3] < '0' || tty[3] > '9')
3937 r = safe_atoi(tty+3, &i);
3941 if (i < 0 || i > 63)
3947 char *resolve_dev_console(char **active) {
3950 /* Resolve where /dev/console is pointing to, if /sys is actually ours
3951 * (i.e. not read-only-mounted which is a sign for container setups) */
3953 if (path_is_read_only_fs("/sys") > 0)
3956 if (read_one_line_file("/sys/class/tty/console/active", active) < 0)
3959 /* If multiple log outputs are configured the last one is what
3960 * /dev/console points to */
3961 tty = strrchr(*active, ' ');
3967 if (streq(tty, "tty0")) {
3970 /* Get the active VC (e.g. tty1) */
3971 if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) {
3973 tty = *active = tmp;
3980 bool tty_is_vc_resolve(const char *tty) {
3981 _cleanup_free_ char *active = NULL;
3985 if (startswith(tty, "/dev/"))
3988 if (streq(tty, "console")) {
3989 tty = resolve_dev_console(&active);
3994 return tty_is_vc(tty);
3997 const char *default_term_for_tty(const char *tty) {
4000 return tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt220";
4003 bool dirent_is_file(const struct dirent *de) {
4006 if (hidden_file(de->d_name))
4009 if (de->d_type != DT_REG &&
4010 de->d_type != DT_LNK &&
4011 de->d_type != DT_UNKNOWN)
4017 bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) {
4020 if (de->d_type != DT_REG &&
4021 de->d_type != DT_LNK &&
4022 de->d_type != DT_UNKNOWN)
4025 if (hidden_file_allow_backup(de->d_name))
4028 return endswith(de->d_name, suffix);
4031 static int do_execute(char **directories, usec_t timeout, char *argv[]) {
4032 _cleanup_hashmap_free_free_ Hashmap *pids = NULL;
4033 _cleanup_set_free_free_ Set *seen = NULL;
4036 /* We fork this all off from a child process so that we can
4037 * somewhat cleanly make use of SIGALRM to set a time limit */
4039 reset_all_signal_handlers();
4040 reset_signal_mask();
4042 assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
4044 pids = hashmap_new(NULL);
4048 seen = set_new(&string_hash_ops);
4052 STRV_FOREACH(directory, directories) {
4053 _cleanup_closedir_ DIR *d;
4056 d = opendir(*directory);
4058 if (errno == ENOENT)
4061 return log_error_errno(errno, "Failed to open directory %s: %m", *directory);
4064 FOREACH_DIRENT(de, d, break) {
4065 _cleanup_free_ char *path = NULL;
4069 if (!dirent_is_file(de))
4072 if (set_contains(seen, de->d_name)) {
4073 log_debug("%1$s/%2$s skipped (%2$s was already seen).", *directory, de->d_name);
4077 r = set_put_strdup(seen, de->d_name);
4081 path = strjoin(*directory, "/", de->d_name, NULL);
4085 if (null_or_empty_path(path)) {
4086 log_debug("%s is empty (a mask).", path);
4092 log_error_errno(errno, "Failed to fork: %m");
4094 } else if (pid == 0) {
4097 assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
4107 return log_error_errno(errno, "Failed to execute %s: %m", path);
4110 log_debug("Spawned %s as " PID_FMT ".", path, pid);
4112 r = hashmap_put(pids, UINT_TO_PTR(pid), path);
4119 /* Abort execution of this process after the timout. We simply
4120 * rely on SIGALRM as default action terminating the process,
4121 * and turn on alarm(). */
4123 if (timeout != USEC_INFINITY)
4124 alarm((timeout + USEC_PER_SEC - 1) / USEC_PER_SEC);
4126 while (!hashmap_isempty(pids)) {
4127 _cleanup_free_ char *path = NULL;
4130 pid = PTR_TO_UINT(hashmap_first_key(pids));
4133 path = hashmap_remove(pids, UINT_TO_PTR(pid));
4136 wait_for_terminate_and_warn(path, pid, true);
4142 void execute_directories(const char* const* directories, usec_t timeout, char *argv[]) {
4146 char **dirs = (char**) directories;
4148 assert(!strv_isempty(dirs));
4150 name = basename(dirs[0]);
4151 assert(!isempty(name));
4153 /* Executes all binaries in the directories in parallel and waits
4154 * for them to finish. Optionally a timeout is applied. If a file
4155 * with the same name exists in more than one directory, the
4156 * earliest one wins. */
4158 executor_pid = fork();
4159 if (executor_pid < 0) {
4160 log_error_errno(errno, "Failed to fork: %m");
4163 } else if (executor_pid == 0) {
4164 r = do_execute(dirs, timeout, argv);
4165 _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
4168 wait_for_terminate_and_warn(name, executor_pid, true);
4171 int kill_and_sigcont(pid_t pid, int sig) {
4174 r = kill(pid, sig) < 0 ? -errno : 0;
4182 bool nulstr_contains(const char*nulstr, const char *needle) {
4188 NULSTR_FOREACH(i, nulstr)
4189 if (streq(i, needle))
4195 bool plymouth_running(void) {
4196 return access("/run/plymouth/pid", F_OK) >= 0;
4199 char* strshorten(char *s, size_t l) {
4208 static bool hostname_valid_char(char c) {
4210 (c >= 'a' && c <= 'z') ||
4211 (c >= 'A' && c <= 'Z') ||
4212 (c >= '0' && c <= '9') ||
4218 bool hostname_is_valid(const char *s) {
4225 /* Doesn't accept empty hostnames, hostnames with trailing or
4226 * leading dots, and hostnames with multiple dots in a
4227 * sequence. Also ensures that the length stays below
4230 for (p = s, dot = true; *p; p++) {
4237 if (!hostname_valid_char(*p))
4247 if (p-s > HOST_NAME_MAX)
4253 char* hostname_cleanup(char *s, bool lowercase) {
4257 for (p = s, d = s, dot = true; *p; p++) {
4264 } else if (hostname_valid_char(*p)) {
4265 *(d++) = lowercase ? tolower(*p) : *p;
4276 strshorten(s, HOST_NAME_MAX);
4281 bool machine_name_is_valid(const char *s) {
4283 if (!hostname_is_valid(s))
4286 /* Machine names should be useful hostnames, but also be
4287 * useful in unit names, hence we enforce a stricter length
4296 int pipe_eof(int fd) {
4297 struct pollfd pollfd = {
4299 .events = POLLIN|POLLHUP,
4304 r = poll(&pollfd, 1, 0);
4311 return pollfd.revents & POLLHUP;
4314 int fd_wait_for_event(int fd, int event, usec_t t) {
4316 struct pollfd pollfd = {
4324 r = ppoll(&pollfd, 1, t == USEC_INFINITY ? NULL : timespec_store(&ts, t), NULL);
4331 return pollfd.revents;
4334 int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
4343 r = tempfn_xxxxxx(path, &t);
4347 fd = mkostemp_safe(t, O_WRONLY|O_CLOEXEC);
4353 f = fdopen(fd, "we");
4366 int terminal_vhangup_fd(int fd) {
4369 if (ioctl(fd, TIOCVHANGUP) < 0)
4375 int terminal_vhangup(const char *name) {
4376 _cleanup_close_ int fd;
4378 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4382 return terminal_vhangup_fd(fd);
4385 int vt_disallocate(const char *name) {
4389 /* Deallocate the VT if possible. If not possible
4390 * (i.e. because it is the active one), at least clear it
4391 * entirely (including the scrollback buffer) */
4393 if (!startswith(name, "/dev/"))
4396 if (!tty_is_vc(name)) {
4397 /* So this is not a VT. I guess we cannot deallocate
4398 * it then. But let's at least clear the screen */
4400 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4405 "\033[r" /* clear scrolling region */
4406 "\033[H" /* move home */
4407 "\033[2J", /* clear screen */
4414 if (!startswith(name, "/dev/tty"))
4417 r = safe_atou(name+8, &u);
4424 /* Try to deallocate */
4425 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
4429 r = ioctl(fd, VT_DISALLOCATE, u);
4438 /* Couldn't deallocate, so let's clear it fully with
4440 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4445 "\033[r" /* clear scrolling region */
4446 "\033[H" /* move home */
4447 "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */
4454 int symlink_atomic(const char *from, const char *to) {
4455 _cleanup_free_ char *t = NULL;
4461 r = tempfn_random(to, &t);
4465 if (symlink(from, t) < 0)
4468 if (rename(t, to) < 0) {
4476 int mknod_atomic(const char *path, mode_t mode, dev_t dev) {
4477 _cleanup_free_ char *t = NULL;
4482 r = tempfn_random(path, &t);
4486 if (mknod(t, mode, dev) < 0)
4489 if (rename(t, path) < 0) {
4497 int mkfifo_atomic(const char *path, mode_t mode) {
4498 _cleanup_free_ char *t = NULL;
4503 r = tempfn_random(path, &t);
4507 if (mkfifo(t, mode) < 0)
4510 if (rename(t, path) < 0) {
4518 bool display_is_local(const char *display) {
4522 display[0] == ':' &&
4523 display[1] >= '0' &&
4527 int socket_from_display(const char *display, char **path) {
4534 if (!display_is_local(display))
4537 k = strspn(display+1, "0123456789");
4539 f = new(char, strlen("/tmp/.X11-unix/X") + k + 1);
4543 c = stpcpy(f, "/tmp/.X11-unix/X");
4544 memcpy(c, display+1, k);
4553 const char **username,
4554 uid_t *uid, gid_t *gid,
4556 const char **shell) {
4564 /* We enforce some special rules for uid=0: in order to avoid
4565 * NSS lookups for root we hardcode its data. */
4567 if (streq(*username, "root") || streq(*username, "0")) {
4585 if (parse_uid(*username, &u) >= 0) {
4589 /* If there are multiple users with the same id, make
4590 * sure to leave $USER to the configured value instead
4591 * of the first occurrence in the database. However if
4592 * the uid was configured by a numeric uid, then let's
4593 * pick the real username from /etc/passwd. */
4595 *username = p->pw_name;
4598 p = getpwnam(*username);
4602 return errno > 0 ? -errno : -ESRCH;
4614 *shell = p->pw_shell;
4619 char* uid_to_name(uid_t uid) {
4624 return strdup("root");
4628 return strdup(p->pw_name);
4630 if (asprintf(&r, UID_FMT, uid) < 0)
4636 char* gid_to_name(gid_t gid) {
4641 return strdup("root");
4645 return strdup(p->gr_name);
4647 if (asprintf(&r, GID_FMT, gid) < 0)
4653 int get_group_creds(const char **groupname, gid_t *gid) {
4659 /* We enforce some special rules for gid=0: in order to avoid
4660 * NSS lookups for root we hardcode its data. */
4662 if (streq(*groupname, "root") || streq(*groupname, "0")) {
4663 *groupname = "root";
4671 if (parse_gid(*groupname, &id) >= 0) {
4676 *groupname = g->gr_name;
4679 g = getgrnam(*groupname);
4683 return errno > 0 ? -errno : -ESRCH;
4691 int in_gid(gid_t gid) {
4693 int ngroups_max, r, i;
4695 if (getgid() == gid)
4698 if (getegid() == gid)
4701 ngroups_max = sysconf(_SC_NGROUPS_MAX);
4702 assert(ngroups_max > 0);
4704 gids = alloca(sizeof(gid_t) * ngroups_max);
4706 r = getgroups(ngroups_max, gids);
4710 for (i = 0; i < r; i++)
4717 int in_group(const char *name) {
4721 r = get_group_creds(&name, &gid);
4728 int glob_exists(const char *path) {
4729 _cleanup_globfree_ glob_t g = {};
4735 k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
4737 if (k == GLOB_NOMATCH)
4739 else if (k == GLOB_NOSPACE)
4742 return !strv_isempty(g.gl_pathv);
4744 return errno ? -errno : -EIO;
4747 int glob_extend(char ***strv, const char *path) {
4748 _cleanup_globfree_ glob_t g = {};
4753 k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
4755 if (k == GLOB_NOMATCH)
4757 else if (k == GLOB_NOSPACE)
4759 else if (k != 0 || strv_isempty(g.gl_pathv))
4760 return errno ? -errno : -EIO;
4762 STRV_FOREACH(p, g.gl_pathv) {
4763 k = strv_extend(strv, *p);
4771 int dirent_ensure_type(DIR *d, struct dirent *de) {
4777 if (de->d_type != DT_UNKNOWN)
4780 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
4784 S_ISREG(st.st_mode) ? DT_REG :
4785 S_ISDIR(st.st_mode) ? DT_DIR :
4786 S_ISLNK(st.st_mode) ? DT_LNK :
4787 S_ISFIFO(st.st_mode) ? DT_FIFO :
4788 S_ISSOCK(st.st_mode) ? DT_SOCK :
4789 S_ISCHR(st.st_mode) ? DT_CHR :
4790 S_ISBLK(st.st_mode) ? DT_BLK :
4796 int get_files_in_directory(const char *path, char ***list) {
4797 _cleanup_closedir_ DIR *d = NULL;
4798 size_t bufsize = 0, n = 0;
4799 _cleanup_strv_free_ char **l = NULL;
4803 /* Returns all files in a directory in *list, and the number
4804 * of files as return value. If list is NULL returns only the
4816 if (!de && errno != 0)
4821 dirent_ensure_type(d, de);
4823 if (!dirent_is_file(de))
4827 /* one extra slot is needed for the terminating NULL */
4828 if (!GREEDY_REALLOC(l, bufsize, n + 2))
4831 l[n] = strdup(de->d_name);
4842 l = NULL; /* avoid freeing */
4848 char *strjoin(const char *x, ...) {
4862 t = va_arg(ap, const char *);
4867 if (n > ((size_t) -1) - l) {
4891 t = va_arg(ap, const char *);
4905 bool is_main_thread(void) {
4906 static thread_local int cached = 0;
4908 if (_unlikely_(cached == 0))
4909 cached = getpid() == gettid() ? 1 : -1;
4914 int block_get_whole_disk(dev_t d, dev_t *ret) {
4921 /* If it has a queue this is good enough for us */
4922 if (asprintf(&p, "/sys/dev/block/%u:%u/queue", major(d), minor(d)) < 0)
4925 r = access(p, F_OK);
4933 /* If it is a partition find the originating device */
4934 if (asprintf(&p, "/sys/dev/block/%u:%u/partition", major(d), minor(d)) < 0)
4937 r = access(p, F_OK);
4943 /* Get parent dev_t */
4944 if (asprintf(&p, "/sys/dev/block/%u:%u/../dev", major(d), minor(d)) < 0)
4947 r = read_one_line_file(p, &s);
4953 r = sscanf(s, "%u:%u", &m, &n);
4959 /* Only return this if it is really good enough for us. */
4960 if (asprintf(&p, "/sys/dev/block/%u:%u/queue", m, n) < 0)
4963 r = access(p, F_OK);
4967 *ret = makedev(m, n);
4974 static const char *const ioprio_class_table[] = {
4975 [IOPRIO_CLASS_NONE] = "none",
4976 [IOPRIO_CLASS_RT] = "realtime",
4977 [IOPRIO_CLASS_BE] = "best-effort",
4978 [IOPRIO_CLASS_IDLE] = "idle"
4981 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ioprio_class, int, INT_MAX);
4983 static const char *const sigchld_code_table[] = {
4984 [CLD_EXITED] = "exited",
4985 [CLD_KILLED] = "killed",
4986 [CLD_DUMPED] = "dumped",
4987 [CLD_TRAPPED] = "trapped",
4988 [CLD_STOPPED] = "stopped",
4989 [CLD_CONTINUED] = "continued",
4992 DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
4994 static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = {
4995 [LOG_FAC(LOG_KERN)] = "kern",
4996 [LOG_FAC(LOG_USER)] = "user",
4997 [LOG_FAC(LOG_MAIL)] = "mail",
4998 [LOG_FAC(LOG_DAEMON)] = "daemon",
4999 [LOG_FAC(LOG_AUTH)] = "auth",
5000 [LOG_FAC(LOG_SYSLOG)] = "syslog",
5001 [LOG_FAC(LOG_LPR)] = "lpr",
5002 [LOG_FAC(LOG_NEWS)] = "news",
5003 [LOG_FAC(LOG_UUCP)] = "uucp",
5004 [LOG_FAC(LOG_CRON)] = "cron",
5005 [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
5006 [LOG_FAC(LOG_FTP)] = "ftp",
5007 [LOG_FAC(LOG_LOCAL0)] = "local0",
5008 [LOG_FAC(LOG_LOCAL1)] = "local1",
5009 [LOG_FAC(LOG_LOCAL2)] = "local2",
5010 [LOG_FAC(LOG_LOCAL3)] = "local3",
5011 [LOG_FAC(LOG_LOCAL4)] = "local4",
5012 [LOG_FAC(LOG_LOCAL5)] = "local5",
5013 [LOG_FAC(LOG_LOCAL6)] = "local6",
5014 [LOG_FAC(LOG_LOCAL7)] = "local7"
5017 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_facility_unshifted, int, LOG_FAC(~0));
5019 static const char *const log_level_table[] = {
5020 [LOG_EMERG] = "emerg",
5021 [LOG_ALERT] = "alert",
5022 [LOG_CRIT] = "crit",
5024 [LOG_WARNING] = "warning",
5025 [LOG_NOTICE] = "notice",
5026 [LOG_INFO] = "info",
5027 [LOG_DEBUG] = "debug"
5030 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_level, int, LOG_DEBUG);
5032 static const char* const sched_policy_table[] = {
5033 [SCHED_OTHER] = "other",
5034 [SCHED_BATCH] = "batch",
5035 [SCHED_IDLE] = "idle",
5036 [SCHED_FIFO] = "fifo",
5040 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sched_policy, int, INT_MAX);
5042 static const char* const rlimit_table[_RLIMIT_MAX] = {
5043 [RLIMIT_CPU] = "LimitCPU",
5044 [RLIMIT_FSIZE] = "LimitFSIZE",
5045 [RLIMIT_DATA] = "LimitDATA",
5046 [RLIMIT_STACK] = "LimitSTACK",
5047 [RLIMIT_CORE] = "LimitCORE",
5048 [RLIMIT_RSS] = "LimitRSS",
5049 [RLIMIT_NOFILE] = "LimitNOFILE",
5050 [RLIMIT_AS] = "LimitAS",
5051 [RLIMIT_NPROC] = "LimitNPROC",
5052 [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
5053 [RLIMIT_LOCKS] = "LimitLOCKS",
5054 [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
5055 [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
5056 [RLIMIT_NICE] = "LimitNICE",
5057 [RLIMIT_RTPRIO] = "LimitRTPRIO",
5058 [RLIMIT_RTTIME] = "LimitRTTIME"
5061 DEFINE_STRING_TABLE_LOOKUP(rlimit, int);
5063 static const char* const ip_tos_table[] = {
5064 [IPTOS_LOWDELAY] = "low-delay",
5065 [IPTOS_THROUGHPUT] = "throughput",
5066 [IPTOS_RELIABILITY] = "reliability",
5067 [IPTOS_LOWCOST] = "low-cost",
5070 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff);
5072 static const char *const __signal_table[] = {
5089 [SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */
5100 [SIGVTALRM] = "VTALRM",
5102 [SIGWINCH] = "WINCH",
5108 DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int);
5110 const char *signal_to_string(int signo) {
5111 static thread_local char buf[sizeof("RTMIN+")-1 + DECIMAL_STR_MAX(int) + 1];
5114 name = __signal_to_string(signo);
5118 if (signo >= SIGRTMIN && signo <= SIGRTMAX)
5119 snprintf(buf, sizeof(buf), "RTMIN+%d", signo - SIGRTMIN);
5121 snprintf(buf, sizeof(buf), "%d", signo);
5126 int signal_from_string(const char *s) {
5131 signo = __signal_from_string(s);
5135 if (startswith(s, "RTMIN+")) {
5139 if (safe_atou(s, &u) >= 0) {
5140 signo = (int) u + offset;
5141 if (signo > 0 && signo < _NSIG)
5147 bool kexec_loaded(void) {
5148 bool loaded = false;
5151 if (read_one_line_file("/sys/kernel/kexec_loaded", &s) >= 0) {
5159 int prot_from_flags(int flags) {
5161 switch (flags & O_ACCMODE) {
5170 return PROT_READ|PROT_WRITE;
5177 char *format_bytes(char *buf, size_t l, off_t t) {
5180 static const struct {
5184 { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
5185 { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
5186 { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
5187 { "G", 1024ULL*1024ULL*1024ULL },
5188 { "M", 1024ULL*1024ULL },
5192 if (t == (off_t) -1)
5195 for (i = 0; i < ELEMENTSOF(table); i++) {
5197 if (t >= table[i].factor) {
5200 (unsigned long long) (t / table[i].factor),
5201 (unsigned long long) (((t*10ULL) / table[i].factor) % 10ULL),
5208 snprintf(buf, l, "%lluB", (unsigned long long) t);
5216 void* memdup(const void *p, size_t l) {
5229 int fd_inc_sndbuf(int fd, size_t n) {
5231 socklen_t l = sizeof(value);
5233 r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l);
5234 if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2)
5237 /* If we have the privileges we will ignore the kernel limit. */
5240 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
5241 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
5247 int fd_inc_rcvbuf(int fd, size_t n) {
5249 socklen_t l = sizeof(value);
5251 r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l);
5252 if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2)
5255 /* If we have the privileges we will ignore the kernel limit. */
5258 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
5259 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
5264 int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...) {
5265 bool stdout_is_tty, stderr_is_tty;
5266 pid_t parent_pid, agent_pid;
5267 sigset_t ss, saved_ss;
5275 /* Spawns a temporary TTY agent, making sure it goes away when
5278 parent_pid = getpid();
5280 /* First we temporarily block all signals, so that the new
5281 * child has them blocked initially. This way, we can be sure
5282 * that SIGTERMs are not lost we might send to the agent. */
5283 assert_se(sigfillset(&ss) >= 0);
5284 assert_se(sigprocmask(SIG_SETMASK, &ss, &saved_ss) >= 0);
5287 if (agent_pid < 0) {
5288 assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0);
5292 if (agent_pid != 0) {
5293 assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0);
5300 * Make sure the agent goes away when the parent dies */
5301 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
5302 _exit(EXIT_FAILURE);
5304 /* Make sure we actually can kill the agent, if we need to, in
5305 * case somebody invoked us from a shell script that trapped
5306 * SIGTERM or so... */
5307 reset_all_signal_handlers();
5308 reset_signal_mask();
5310 /* Check whether our parent died before we were able
5311 * to set the death signal and unblock the signals */
5312 if (getppid() != parent_pid)
5313 _exit(EXIT_SUCCESS);
5315 /* Don't leak fds to the agent */
5316 close_all_fds(except, n_except);
5318 stdout_is_tty = isatty(STDOUT_FILENO);
5319 stderr_is_tty = isatty(STDERR_FILENO);
5321 if (!stdout_is_tty || !stderr_is_tty) {
5324 /* Detach from stdout/stderr. and reopen
5325 * /dev/tty for them. This is important to
5326 * ensure that when systemctl is started via
5327 * popen() or a similar call that expects to
5328 * read EOF we actually do generate EOF and
5329 * not delay this indefinitely by because we
5330 * keep an unused copy of stdin around. */
5331 fd = open("/dev/tty", O_WRONLY);
5333 log_error_errno(errno, "Failed to open /dev/tty: %m");
5334 _exit(EXIT_FAILURE);
5338 dup2(fd, STDOUT_FILENO);
5341 dup2(fd, STDERR_FILENO);
5347 /* Count arguments */
5349 for (n = 0; va_arg(ap, char*); n++)
5354 l = alloca(sizeof(char *) * (n + 1));
5356 /* Fill in arguments */
5358 for (i = 0; i <= n; i++)
5359 l[i] = va_arg(ap, char*);
5363 _exit(EXIT_FAILURE);
5366 int setrlimit_closest(int resource, const struct rlimit *rlim) {
5367 struct rlimit highest, fixed;
5371 if (setrlimit(resource, rlim) >= 0)
5377 /* So we failed to set the desired setrlimit, then let's try
5378 * to get as close as we can */
5379 assert_se(getrlimit(resource, &highest) == 0);
5381 fixed.rlim_cur = MIN(rlim->rlim_cur, highest.rlim_max);
5382 fixed.rlim_max = MIN(rlim->rlim_max, highest.rlim_max);
5384 if (setrlimit(resource, &fixed) < 0)
5390 int getenv_for_pid(pid_t pid, const char *field, char **_value) {
5391 _cleanup_fclose_ FILE *f = NULL;
5402 path = procfs_file_alloca(pid, "environ");
5404 f = fopen(path, "re");
5412 char line[LINE_MAX];
5415 for (i = 0; i < sizeof(line)-1; i++) {
5419 if (_unlikely_(c == EOF)) {
5429 if (memcmp(line, field, l) == 0 && line[l] == '=') {
5430 value = strdup(line + l + 1);
5444 bool http_etag_is_valid(const char *etag) {
5448 if (!endswith(etag, "\""))
5451 if (!startswith(etag, "\"") && !startswith(etag, "W/\""))
5457 bool http_url_is_valid(const char *url) {
5463 p = startswith(url, "http://");
5465 p = startswith(url, "https://");
5472 return ascii_is_valid(p);
5475 bool documentation_url_is_valid(const char *url) {
5481 if (http_url_is_valid(url))
5484 p = startswith(url, "file:/");
5486 p = startswith(url, "info:");
5488 p = startswith(url, "man:");
5493 return ascii_is_valid(p);
5496 bool in_initrd(void) {
5497 static int saved = -1;
5503 /* We make two checks here:
5505 * 1. the flag file /etc/initrd-release must exist
5506 * 2. the root file system must be a memory file system
5508 * The second check is extra paranoia, since misdetecting an
5509 * initrd can have bad bad consequences due the initrd
5510 * emptying when transititioning to the main systemd.
5513 saved = access("/etc/initrd-release", F_OK) >= 0 &&
5514 statfs("/", &s) >= 0 &&
5515 is_temporary_fs(&s);
5520 void warn_melody(void) {
5521 _cleanup_close_ int fd = -1;
5523 fd = open("/dev/console", O_WRONLY|O_CLOEXEC|O_NOCTTY);
5527 /* Yeah, this is synchronous. Kinda sucks. But well... */
5529 ioctl(fd, KIOCSOUND, (int)(1193180/440));
5530 usleep(125*USEC_PER_MSEC);
5532 ioctl(fd, KIOCSOUND, (int)(1193180/220));
5533 usleep(125*USEC_PER_MSEC);
5535 ioctl(fd, KIOCSOUND, (int)(1193180/220));
5536 usleep(125*USEC_PER_MSEC);
5538 ioctl(fd, KIOCSOUND, 0);
5541 int make_console_stdio(void) {
5544 /* Make /dev/console the controlling terminal and stdin/stdout/stderr */
5546 fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY);
5548 return log_error_errno(fd, "Failed to acquire terminal: %m");
5552 return log_error_errno(r, "Failed to duplicate terminal fd: %m");
5557 int get_home_dir(char **_h) {
5565 /* Take the user specified one */
5566 e = secure_getenv("HOME");
5567 if (e && path_is_absolute(e)) {
5576 /* Hardcode home directory for root to avoid NSS */
5579 h = strdup("/root");
5587 /* Check the database... */
5591 return errno > 0 ? -errno : -ESRCH;
5593 if (!path_is_absolute(p->pw_dir))
5596 h = strdup(p->pw_dir);
5604 int get_shell(char **_s) {
5612 /* Take the user specified one */
5613 e = getenv("SHELL");
5623 /* Hardcode home directory for root to avoid NSS */
5626 s = strdup("/bin/sh");
5634 /* Check the database... */
5638 return errno > 0 ? -errno : -ESRCH;
5640 if (!path_is_absolute(p->pw_shell))
5643 s = strdup(p->pw_shell);
5651 bool filename_is_valid(const char *p) {
5665 if (strlen(p) > FILENAME_MAX)
5671 bool string_is_safe(const char *p) {
5677 for (t = p; *t; t++) {
5678 if (*t > 0 && *t < ' ')
5681 if (strchr("\\\"\'\0x7f", *t))
5689 * Check if a string contains control characters. If 'ok' is non-NULL
5690 * it may be a string containing additional CCs to be considered OK.
5692 bool string_has_cc(const char *p, const char *ok) {
5697 for (t = p; *t; t++) {
5698 if (ok && strchr(ok, *t))
5701 if (*t > 0 && *t < ' ')
5711 bool path_is_safe(const char *p) {
5716 if (streq(p, "..") || startswith(p, "../") || endswith(p, "/..") || strstr(p, "/../"))
5719 if (strlen(p) > PATH_MAX)
5722 /* The following two checks are not really dangerous, but hey, they still are confusing */
5723 if (streq(p, ".") || startswith(p, "./") || endswith(p, "/.") || strstr(p, "/./"))
5726 if (strstr(p, "//"))
5732 /* hey glibc, APIs with callbacks without a user pointer are so useless */
5733 void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size,
5734 int (*compar) (const void *, const void *, void *), void *arg) {
5743 p = (void *)(((const char *) base) + (idx * size));
5744 comparison = compar(key, p, arg);
5747 else if (comparison > 0)
5755 void init_gettext(void) {
5756 setlocale(LC_ALL, "");
5757 textdomain(GETTEXT_PACKAGE);
5760 bool is_locale_utf8(void) {
5762 static int cached_answer = -1;
5764 if (cached_answer >= 0)
5767 if (!setlocale(LC_ALL, "")) {
5768 cached_answer = true;
5772 set = nl_langinfo(CODESET);
5774 cached_answer = true;
5778 if (streq(set, "UTF-8")) {
5779 cached_answer = true;
5783 /* For LC_CTYPE=="C" return true, because CTYPE is effectly
5784 * unset and everything can do to UTF-8 nowadays. */
5785 set = setlocale(LC_CTYPE, NULL);
5787 cached_answer = true;
5791 /* Check result, but ignore the result if C was set
5795 !getenv("LC_ALL") &&
5796 !getenv("LC_CTYPE") &&
5800 return (bool) cached_answer;
5803 const char *draw_special_char(DrawSpecialChar ch) {
5804 static const char *draw_table[2][_DRAW_SPECIAL_CHAR_MAX] = {
5807 [DRAW_TREE_VERTICAL] = "\342\224\202 ", /* │ */
5808 [DRAW_TREE_BRANCH] = "\342\224\234\342\224\200", /* ├─ */
5809 [DRAW_TREE_RIGHT] = "\342\224\224\342\224\200", /* └─ */
5810 [DRAW_TREE_SPACE] = " ", /* */
5811 [DRAW_TRIANGULAR_BULLET] = "\342\200\243", /* ‣ */
5812 [DRAW_BLACK_CIRCLE] = "\342\227\217", /* ● */
5813 [DRAW_ARROW] = "\342\206\222", /* → */
5814 [DRAW_DASH] = "\342\200\223", /* – */
5817 /* ASCII fallback */ {
5818 [DRAW_TREE_VERTICAL] = "| ",
5819 [DRAW_TREE_BRANCH] = "|-",
5820 [DRAW_TREE_RIGHT] = "`-",
5821 [DRAW_TREE_SPACE] = " ",
5822 [DRAW_TRIANGULAR_BULLET] = ">",
5823 [DRAW_BLACK_CIRCLE] = "*",
5824 [DRAW_ARROW] = "->",
5829 return draw_table[!is_locale_utf8()][ch];
5832 char *strreplace(const char *text, const char *old_string, const char *new_string) {
5835 size_t l, old_len, new_len;
5841 old_len = strlen(old_string);
5842 new_len = strlen(new_string);
5855 if (!startswith(f, old_string)) {
5861 nl = l - old_len + new_len;
5862 a = realloc(r, nl + 1);
5870 t = stpcpy(t, new_string);
5882 char *strip_tab_ansi(char **ibuf, size_t *_isz) {
5883 const char *i, *begin = NULL;
5888 } state = STATE_OTHER;
5890 size_t osz = 0, isz;
5896 /* Strips ANSI color and replaces TABs by 8 spaces */
5898 isz = _isz ? *_isz : strlen(*ibuf);
5900 f = open_memstream(&obuf, &osz);
5904 for (i = *ibuf; i < *ibuf + isz + 1; i++) {
5909 if (i >= *ibuf + isz) /* EOT */
5911 else if (*i == '\x1B')
5912 state = STATE_ESCAPE;
5913 else if (*i == '\t')
5920 if (i >= *ibuf + isz) { /* EOT */
5923 } else if (*i == '[') {
5924 state = STATE_BRACKET;
5929 state = STATE_OTHER;
5936 if (i >= *ibuf + isz || /* EOT */
5937 (!(*i >= '0' && *i <= '9') && *i != ';' && *i != 'm')) {
5940 state = STATE_OTHER;
5942 } else if (*i == 'm')
5943 state = STATE_OTHER;
5965 int on_ac_power(void) {
5966 bool found_offline = false, found_online = false;
5967 _cleanup_closedir_ DIR *d = NULL;
5969 d = opendir("/sys/class/power_supply");
5971 return errno == ENOENT ? true : -errno;
5975 _cleanup_close_ int fd = -1, device = -1;
5981 if (!de && errno != 0)
5987 if (hidden_file(de->d_name))
5990 device = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC|O_NOCTTY);
5992 if (errno == ENOENT || errno == ENOTDIR)
5998 fd = openat(device, "type", O_RDONLY|O_CLOEXEC|O_NOCTTY);
6000 if (errno == ENOENT)
6006 n = read(fd, contents, sizeof(contents));
6010 if (n != 6 || memcmp(contents, "Mains\n", 6))
6014 fd = openat(device, "online", O_RDONLY|O_CLOEXEC|O_NOCTTY);
6016 if (errno == ENOENT)
6022 n = read(fd, contents, sizeof(contents));
6026 if (n != 2 || contents[1] != '\n')
6029 if (contents[0] == '1') {
6030 found_online = true;
6032 } else if (contents[0] == '0')
6033 found_offline = true;
6038 return found_online || !found_offline;
6041 static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) {
6048 if (!path_strv_resolve_uniq(search, root))
6051 STRV_FOREACH(i, search) {
6052 _cleanup_free_ char *p = NULL;
6056 p = strjoin(root, *i, "/", path, NULL);
6058 p = strjoin(*i, "/", path, NULL);
6068 if (errno != ENOENT)
6075 int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) {
6076 _cleanup_strv_free_ char **copy = NULL;
6082 if (path_is_absolute(path)) {
6085 f = fopen(path, mode);
6094 copy = strv_copy((char**) search);
6098 return search_and_fopen_internal(path, mode, root, copy, _f);
6101 int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) {
6102 _cleanup_strv_free_ char **s = NULL;
6104 if (path_is_absolute(path)) {
6107 f = fopen(path, mode);
6116 s = strv_split_nulstr(search);
6120 return search_and_fopen_internal(path, mode, root, s, _f);
6123 char *strextend(char **x, ...) {
6130 l = f = *x ? strlen(*x) : 0;
6137 t = va_arg(ap, const char *);
6142 if (n > ((size_t) -1) - l) {
6151 r = realloc(*x, l+1);
6161 t = va_arg(ap, const char *);
6175 char *strrep(const char *s, unsigned n) {
6183 p = r = malloc(l * n + 1);
6187 for (i = 0; i < n; i++)
6194 void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size) {
6201 if (*allocated >= need)
6204 newalloc = MAX(need * 2, 64u / size);
6205 a = newalloc * size;
6207 /* check for overflows */
6208 if (a < size * need)
6216 *allocated = newalloc;
6220 void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size) {
6229 q = greedy_realloc(p, allocated, need, size);
6233 if (*allocated > prev)
6234 memzero(q + prev * size, (*allocated - prev) * size);
6239 bool id128_is_valid(const char *s) {
6245 /* Simple formatted 128bit hex string */
6247 for (i = 0; i < l; i++) {
6250 if (!(c >= '0' && c <= '9') &&
6251 !(c >= 'a' && c <= 'z') &&
6252 !(c >= 'A' && c <= 'Z'))
6256 } else if (l == 36) {
6258 /* Formatted UUID */
6260 for (i = 0; i < l; i++) {
6263 if ((i == 8 || i == 13 || i == 18 || i == 23)) {
6267 if (!(c >= '0' && c <= '9') &&
6268 !(c >= 'a' && c <= 'z') &&
6269 !(c >= 'A' && c <= 'Z'))
6280 int split_pair(const char *s, const char *sep, char **l, char **r) {
6295 a = strndup(s, x - s);
6299 b = strdup(x + strlen(sep));
6311 int shall_restore_state(void) {
6312 _cleanup_free_ char *value = NULL;
6315 r = get_proc_cmdline_key("systemd.restore_state=", &value);
6321 return parse_boolean(value) != 0;
6324 int proc_cmdline(char **ret) {
6327 if (detect_container(NULL) > 0)
6328 return get_process_cmdline(1, 0, false, ret);
6330 return read_one_line_file("/proc/cmdline", ret);
6333 int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value)) {
6334 _cleanup_free_ char *line = NULL;
6340 r = proc_cmdline(&line);
6346 _cleanup_free_ char *word = NULL;
6349 r = unquote_first_word(&p, &word, UNQUOTE_RELAX);
6355 /* Filter out arguments that are intended only for the
6357 if (!in_initrd() && startswith(word, "rd."))
6360 value = strchr(word, '=');
6364 r = parse_item(word, value);
6372 int get_proc_cmdline_key(const char *key, char **value) {
6373 _cleanup_free_ char *line = NULL, *ret = NULL;
6380 r = proc_cmdline(&line);
6386 _cleanup_free_ char *word = NULL;
6389 r = unquote_first_word(&p, &word, UNQUOTE_RELAX);
6395 /* Filter out arguments that are intended only for the
6397 if (!in_initrd() && startswith(word, "rd."))
6401 e = startswith(word, key);
6405 r = free_and_strdup(&ret, e);
6411 if (streq(word, key))
6425 int container_get_leader(const char *machine, pid_t *pid) {
6426 _cleanup_free_ char *s = NULL, *class = NULL;
6434 p = strjoina("/run/systemd/machines/", machine);
6435 r = parse_env_file(p, NEWLINE, "LEADER", &s, "CLASS", &class, NULL);
6443 if (!streq_ptr(class, "container"))
6446 r = parse_pid(s, &leader);
6456 int namespace_open(pid_t pid, int *pidns_fd, int *mntns_fd, int *netns_fd, int *root_fd) {
6457 _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, netnsfd = -1;
6465 mntns = procfs_file_alloca(pid, "ns/mnt");
6466 mntnsfd = open(mntns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
6474 pidns = procfs_file_alloca(pid, "ns/pid");
6475 pidnsfd = open(pidns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
6483 netns = procfs_file_alloca(pid, "ns/net");
6484 netnsfd = open(netns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
6492 root = procfs_file_alloca(pid, "root");
6493 rfd = open(root, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
6499 *pidns_fd = pidnsfd;
6502 *mntns_fd = mntnsfd;
6505 *netns_fd = netnsfd;
6510 pidnsfd = mntnsfd = netnsfd = -1;
6515 int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int root_fd) {
6518 if (setns(pidns_fd, CLONE_NEWPID) < 0)
6522 if (setns(mntns_fd, CLONE_NEWNS) < 0)
6526 if (setns(netns_fd, CLONE_NEWNET) < 0)
6530 if (fchdir(root_fd) < 0)
6533 if (chroot(".") < 0)
6537 if (setresgid(0, 0, 0) < 0)
6540 if (setgroups(0, NULL) < 0)
6543 if (setresuid(0, 0, 0) < 0)
6549 bool pid_is_unwaited(pid_t pid) {
6550 /* Checks whether a PID is still valid at all, including a zombie */
6555 if (kill(pid, 0) >= 0)
6558 return errno != ESRCH;
6561 bool pid_is_alive(pid_t pid) {
6564 /* Checks whether a PID is still valid and not a zombie */
6569 r = get_process_state(pid);
6570 if (r == -ENOENT || r == 'Z')
6576 int getpeercred(int fd, struct ucred *ucred) {
6577 socklen_t n = sizeof(struct ucred);
6584 r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &u, &n);
6588 if (n != sizeof(struct ucred))
6591 /* Check if the data is actually useful and not suppressed due
6592 * to namespacing issues */
6595 if (u.uid == UID_INVALID)
6597 if (u.gid == GID_INVALID)
6604 int getpeersec(int fd, char **ret) {
6616 r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n);
6620 if (errno != ERANGE)
6627 r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n);
6643 /* This is much like like mkostemp() but is subject to umask(). */
6644 int mkostemp_safe(char *pattern, int flags) {
6645 _cleanup_umask_ mode_t u;
6652 fd = mkostemp(pattern, flags);
6659 int open_tmpfile(const char *path, int flags) {
6666 /* Try O_TMPFILE first, if it is supported */
6667 fd = open(path, flags|O_TMPFILE, S_IRUSR|S_IWUSR);
6672 /* Fall back to unguessable name + unlinking */
6673 p = strjoina(path, "/systemd-tmp-XXXXXX");
6675 fd = mkostemp_safe(p, flags);
6683 int fd_warn_permissions(const char *path, int fd) {
6686 if (fstat(fd, &st) < 0)
6689 if (st.st_mode & 0111)
6690 log_warning("Configuration file %s is marked executable. Please remove executable permission bits. Proceeding anyway.", path);
6692 if (st.st_mode & 0002)
6693 log_warning("Configuration file %s is marked world-writable. Please remove world writability permission bits. Proceeding anyway.", path);
6695 if (getpid() == 1 && (st.st_mode & 0044) != 0044)
6696 log_warning("Configuration file %s is marked world-inaccessible. This has no effect as configuration data is accessible via APIs without restrictions. Proceeding anyway.", path);
6701 unsigned long personality_from_string(const char *p) {
6703 /* Parse a personality specifier. We introduce our own
6704 * identifiers that indicate specific ABIs, rather than just
6705 * hints regarding the register size, since we want to keep
6706 * things open for multiple locally supported ABIs for the
6707 * same register size. We try to reuse the ABI identifiers
6708 * used by libseccomp. */
6710 #if defined(__x86_64__)
6712 if (streq(p, "x86"))
6715 if (streq(p, "x86-64"))
6718 #elif defined(__i386__)
6720 if (streq(p, "x86"))
6724 /* personality(7) documents that 0xffffffffUL is used for
6725 * querying the current personality, hence let's use that here
6726 * as error indicator. */
6727 return 0xffffffffUL;
6730 const char* personality_to_string(unsigned long p) {
6732 #if defined(__x86_64__)
6734 if (p == PER_LINUX32)
6740 #elif defined(__i386__)
6749 uint64_t physical_memory(void) {
6752 /* We return this as uint64_t in case we are running as 32bit
6753 * process on a 64bit kernel with huge amounts of memory */
6755 mem = sysconf(_SC_PHYS_PAGES);
6758 return (uint64_t) mem * (uint64_t) page_size();
6761 void hexdump(FILE *f, const void *p, size_t s) {
6762 const uint8_t *b = p;
6765 assert(s == 0 || b);
6770 fprintf(f, "%04x ", n);
6772 for (i = 0; i < 16; i++) {
6777 fprintf(f, "%02x ", b[i]);
6785 for (i = 0; i < 16; i++) {
6790 fputc(isprint(b[i]) ? (char) b[i] : '.', f);
6804 int update_reboot_param_file(const char *param) {
6809 r = write_string_file(REBOOT_PARAM_FILE, param);
6811 log_error("Failed to write reboot param to "
6812 REBOOT_PARAM_FILE": %s", strerror(-r));
6814 unlink(REBOOT_PARAM_FILE);
6819 int umount_recursive(const char *prefix, int flags) {
6823 /* Try to umount everything recursively below a
6824 * directory. Also, take care of stacked mounts, and keep
6825 * unmounting them until they are gone. */
6828 _cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
6833 proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
6834 if (!proc_self_mountinfo)
6838 _cleanup_free_ char *path = NULL, *p = NULL;
6841 k = fscanf(proc_self_mountinfo,
6842 "%*s " /* (1) mount id */
6843 "%*s " /* (2) parent id */
6844 "%*s " /* (3) major:minor */
6845 "%*s " /* (4) root */
6846 "%ms " /* (5) mount point */
6847 "%*s" /* (6) mount options */
6848 "%*[^-]" /* (7) optional fields */
6849 "- " /* (8) separator */
6850 "%*s " /* (9) file system type */
6851 "%*s" /* (10) mount source */
6852 "%*s" /* (11) mount options 2 */
6853 "%*[^\n]", /* some rubbish at the end */
6862 r = cunescape(path, UNESCAPE_RELAX, &p);
6866 if (!path_startswith(p, prefix))
6869 if (umount2(p, flags) < 0) {
6885 static int get_mount_flags(const char *path, unsigned long *flags) {
6888 if (statvfs(path, &buf) < 0)
6890 *flags = buf.f_flag;
6894 int bind_remount_recursive(const char *prefix, bool ro) {
6895 _cleanup_set_free_free_ Set *done = NULL;
6896 _cleanup_free_ char *cleaned = NULL;
6899 /* Recursively remount a directory (and all its submounts)
6900 * read-only or read-write. If the directory is already
6901 * mounted, we reuse the mount and simply mark it
6902 * MS_BIND|MS_RDONLY (or remove the MS_RDONLY for read-write
6903 * operation). If it isn't we first make it one. Afterwards we
6904 * apply MS_BIND|MS_RDONLY (or remove MS_RDONLY) to all
6905 * submounts we can access, too. When mounts are stacked on
6906 * the same mount point we only care for each individual
6907 * "top-level" mount on each point, as we cannot
6908 * influence/access the underlying mounts anyway. We do not
6909 * have any effect on future submounts that might get
6910 * propagated, they migt be writable. This includes future
6911 * submounts that have been triggered via autofs. */
6913 cleaned = strdup(prefix);
6917 path_kill_slashes(cleaned);
6919 done = set_new(&string_hash_ops);
6924 _cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
6925 _cleanup_set_free_free_ Set *todo = NULL;
6926 bool top_autofs = false;
6928 unsigned long orig_flags;
6930 todo = set_new(&string_hash_ops);
6934 proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
6935 if (!proc_self_mountinfo)
6939 _cleanup_free_ char *path = NULL, *p = NULL, *type = NULL;
6942 k = fscanf(proc_self_mountinfo,
6943 "%*s " /* (1) mount id */
6944 "%*s " /* (2) parent id */
6945 "%*s " /* (3) major:minor */
6946 "%*s " /* (4) root */
6947 "%ms " /* (5) mount point */
6948 "%*s" /* (6) mount options (superblock) */
6949 "%*[^-]" /* (7) optional fields */
6950 "- " /* (8) separator */
6951 "%ms " /* (9) file system type */
6952 "%*s" /* (10) mount source */
6953 "%*s" /* (11) mount options (bind mount) */
6954 "%*[^\n]", /* some rubbish at the end */
6964 r = cunescape(path, UNESCAPE_RELAX, &p);
6968 /* Let's ignore autofs mounts. If they aren't
6969 * triggered yet, we want to avoid triggering
6970 * them, as we don't make any guarantees for
6971 * future submounts anyway. If they are
6972 * already triggered, then we will find
6973 * another entry for this. */
6974 if (streq(type, "autofs")) {
6975 top_autofs = top_autofs || path_equal(cleaned, p);
6979 if (path_startswith(p, cleaned) &&
6980 !set_contains(done, p)) {
6982 r = set_consume(todo, p);
6992 /* If we have no submounts to process anymore and if
6993 * the root is either already done, or an autofs, we
6995 if (set_isempty(todo) &&
6996 (top_autofs || set_contains(done, cleaned)))
6999 if (!set_contains(done, cleaned) &&
7000 !set_contains(todo, cleaned)) {
7001 /* The prefix directory itself is not yet a
7002 * mount, make it one. */
7003 if (mount(cleaned, cleaned, NULL, MS_BIND|MS_REC, NULL) < 0)
7007 (void) get_mount_flags(cleaned, &orig_flags);
7008 orig_flags &= ~MS_RDONLY;
7010 if (mount(NULL, prefix, NULL, orig_flags|MS_BIND|MS_REMOUNT|(ro ? MS_RDONLY : 0), NULL) < 0)
7013 x = strdup(cleaned);
7017 r = set_consume(done, x);
7022 while ((x = set_steal_first(todo))) {
7024 r = set_consume(done, x);
7030 /* Try to reuse the original flag set, but
7031 * don't care for errors, in case of
7032 * obstructed mounts */
7034 (void) get_mount_flags(x, &orig_flags);
7035 orig_flags &= ~MS_RDONLY;
7037 if (mount(NULL, x, NULL, orig_flags|MS_BIND|MS_REMOUNT|(ro ? MS_RDONLY : 0), NULL) < 0) {
7039 /* Deal with mount points that are
7040 * obstructed by a later mount */
7042 if (errno != ENOENT)
7050 int fflush_and_check(FILE *f) {
7057 return errno ? -errno : -EIO;
7062 int tempfn_xxxxxx(const char *p, char **ret) {
7074 * /foo/bar/.#waldoXXXXXX
7078 if (!filename_is_valid(fn))
7081 t = new(char, strlen(p) + 2 + 6 + 1);
7085 strcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), fn), "XXXXXX");
7087 *ret = path_kill_slashes(t);
7091 int tempfn_random(const char *p, char **ret) {
7105 * /foo/bar/.#waldobaa2a261115984a9
7109 if (!filename_is_valid(fn))
7112 t = new(char, strlen(p) + 2 + 16 + 1);
7116 x = stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), fn);
7119 for (i = 0; i < 16; i++) {
7120 *(x++) = hexchar(u & 0xF);
7126 *ret = path_kill_slashes(t);
7130 int tempfn_random_child(const char *p, char **ret) {
7141 * /foo/bar/waldo/.#3c2b6219aa75d7d0
7144 t = new(char, strlen(p) + 3 + 16 + 1);
7148 x = stpcpy(stpcpy(t, p), "/.#");
7151 for (i = 0; i < 16; i++) {
7152 *(x++) = hexchar(u & 0xF);
7158 *ret = path_kill_slashes(t);
7162 /* make sure the hostname is not "localhost" */
7163 bool is_localhost(const char *hostname) {
7166 /* This tries to identify local host and domain names
7167 * described in RFC6761 plus the redhatism of .localdomain */
7169 return streq(hostname, "localhost") ||
7170 streq(hostname, "localhost.") ||
7171 streq(hostname, "localdomain.") ||
7172 streq(hostname, "localdomain") ||
7173 endswith(hostname, ".localhost") ||
7174 endswith(hostname, ".localhost.") ||
7175 endswith(hostname, ".localdomain") ||
7176 endswith(hostname, ".localdomain.");
7179 int take_password_lock(const char *root) {
7181 struct flock flock = {
7183 .l_whence = SEEK_SET,
7191 /* This is roughly the same as lckpwdf(), but not as awful. We
7192 * don't want to use alarm() and signals, hence we implement
7193 * our own trivial version of this.
7195 * Note that shadow-utils also takes per-database locks in
7196 * addition to lckpwdf(). However, we don't given that they
7197 * are redundant as they they invoke lckpwdf() first and keep
7198 * it during everything they do. The per-database locks are
7199 * awfully racy, and thus we just won't do them. */
7202 path = strjoina(root, "/etc/.pwd.lock");
7204 path = "/etc/.pwd.lock";
7206 fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0600);
7210 r = fcntl(fd, F_SETLKW, &flock);
7219 int is_symlink(const char *path) {
7222 if (lstat(path, &info) < 0)
7225 return !!S_ISLNK(info.st_mode);
7228 int is_dir(const char* path, bool follow) {
7233 r = stat(path, &st);
7235 r = lstat(path, &st);
7239 return !!S_ISDIR(st.st_mode);
7242 int unquote_first_word(const char **p, char **ret, UnquoteFlags flags) {
7243 _cleanup_free_ char *s = NULL;
7244 size_t allocated = 0, sz = 0;
7252 SINGLE_QUOTE_ESCAPE,
7254 DOUBLE_QUOTE_ESCAPE,
7262 /* Parses the first word of a string, and returns it in
7263 * *ret. Removes all quotes in the process. When parsing fails
7264 * (because of an uneven number of quotes or similar), leaves
7265 * the pointer *p at the first invalid character. */
7275 else if (strchr(WHITESPACE, c))
7285 state = SINGLE_QUOTE;
7287 state = VALUE_ESCAPE;
7289 state = DOUBLE_QUOTE;
7290 else if (strchr(WHITESPACE, c))
7293 if (!GREEDY_REALLOC(s, allocated, sz+2))
7303 if (flags & UNQUOTE_RELAX)
7308 if (!GREEDY_REALLOC(s, allocated, sz+2))
7311 if (flags & UNQUOTE_CUNESCAPE) {
7314 r = cunescape_one(*p, (size_t) -1, &c, &u);
7321 s[sz++] = c; /* normal explicit char */
7323 sz += utf8_encode_unichar(s, u); /* unicode chars we'll encode as utf8 */
7332 if (flags & UNQUOTE_RELAX)
7335 } else if (c == '\'')
7338 state = SINGLE_QUOTE_ESCAPE;
7340 if (!GREEDY_REALLOC(s, allocated, sz+2))
7348 case SINGLE_QUOTE_ESCAPE:
7350 if (flags & UNQUOTE_RELAX)
7355 if (!GREEDY_REALLOC(s, allocated, sz+2))
7358 if (flags & UNQUOTE_CUNESCAPE) {
7361 r = cunescape_one(*p, (size_t) -1, &c, &u);
7370 sz += utf8_encode_unichar(s, u);
7374 state = SINGLE_QUOTE;
7383 state = DOUBLE_QUOTE_ESCAPE;
7385 if (!GREEDY_REALLOC(s, allocated, sz+2))
7393 case DOUBLE_QUOTE_ESCAPE:
7395 if (flags & UNQUOTE_RELAX)
7400 if (!GREEDY_REALLOC(s, allocated, sz+2))
7403 if (flags & UNQUOTE_CUNESCAPE) {
7406 r = cunescape_one(*p, (size_t) -1, &c, &u);
7415 sz += utf8_encode_unichar(s, u);
7419 state = DOUBLE_QUOTE;
7425 if (!strchr(WHITESPACE, c))
7447 int unquote_many_words(const char **p, UnquoteFlags flags, ...) {
7452 /* Parses a number of words from a string, stripping any
7453 * quotes if necessary. */
7457 /* Count how many words are expected */
7458 va_start(ap, flags);
7460 if (!va_arg(ap, char **))
7469 /* Read all words into a temporary array */
7470 l = newa0(char*, n);
7471 for (c = 0; c < n; c++) {
7473 r = unquote_first_word(p, &l[c], flags);
7477 for (j = 0; j < c; j++)
7487 /* If we managed to parse all words, return them in the passed
7489 va_start(ap, flags);
7490 for (i = 0; i < n; i++) {
7493 v = va_arg(ap, char **);
7503 int free_and_strdup(char **p, const char *s) {
7508 /* Replaces a string pointer with an strdup()ed new string,
7509 * possibly freeing the old one. */
7524 int sethostname_idempotent(const char *s) {
7526 char buf[HOST_NAME_MAX + 1] = {};
7530 r = gethostname(buf, sizeof(buf));
7537 r = sethostname(s, strlen(s));
7544 int ptsname_malloc(int fd, char **ret) {
7557 if (ptsname_r(fd, c, l) == 0) {
7561 if (errno != ERANGE) {
7571 int openpt_in_namespace(pid_t pid, int flags) {
7572 _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, rootfd = -1;
7573 _cleanup_close_pair_ int pair[2] = { -1, -1 };
7575 struct cmsghdr cmsghdr;
7576 uint8_t buf[CMSG_SPACE(sizeof(int))];
7578 struct msghdr mh = {
7579 .msg_control = &control,
7580 .msg_controllen = sizeof(control),
7582 struct cmsghdr *cmsg;
7589 r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &rootfd);
7593 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
7603 pair[0] = safe_close(pair[0]);
7605 r = namespace_enter(pidnsfd, mntnsfd, -1, rootfd);
7607 _exit(EXIT_FAILURE);
7609 master = posix_openpt(flags);
7611 _exit(EXIT_FAILURE);
7613 cmsg = CMSG_FIRSTHDR(&mh);
7614 cmsg->cmsg_level = SOL_SOCKET;
7615 cmsg->cmsg_type = SCM_RIGHTS;
7616 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
7617 memcpy(CMSG_DATA(cmsg), &master, sizeof(int));
7619 mh.msg_controllen = cmsg->cmsg_len;
7621 if (sendmsg(pair[1], &mh, MSG_NOSIGNAL) < 0)
7622 _exit(EXIT_FAILURE);
7624 _exit(EXIT_SUCCESS);
7627 pair[1] = safe_close(pair[1]);
7629 r = wait_for_terminate(child, &si);
7632 if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)
7635 if (recvmsg(pair[0], &mh, MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) < 0)
7638 for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg))
7639 if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
7643 fds = (int*) CMSG_DATA(cmsg);
7644 n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
7647 close_many(fds, n_fds);
7657 ssize_t fgetxattrat_fake(int dirfd, const char *filename, const char *attribute, void *value, size_t size, int flags) {
7658 _cleanup_close_ int fd = -1;
7661 /* The kernel doesn't have a fgetxattrat() command, hence let's emulate one */
7663 fd = openat(dirfd, filename, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOATIME|(flags & AT_SYMLINK_NOFOLLOW ? O_NOFOLLOW : 0));
7667 l = fgetxattr(fd, attribute, value, size);
7674 static int parse_crtime(le64_t le, usec_t *usec) {
7680 if (u == 0 || u == (uint64_t) -1)
7687 int fd_getcrtime(int fd, usec_t *usec) {
7694 /* Until Linux gets a real concept of birthtime/creation time,
7695 * let's fake one with xattrs */
7697 n = fgetxattr(fd, "user.crtime_usec", &le, sizeof(le));
7700 if (n != sizeof(le))
7703 return parse_crtime(le, usec);
7706 int fd_getcrtime_at(int dirfd, const char *name, usec_t *usec, int flags) {
7710 n = fgetxattrat_fake(dirfd, name, "user.crtime_usec", &le, sizeof(le), flags);
7713 if (n != sizeof(le))
7716 return parse_crtime(le, usec);
7719 int path_getcrtime(const char *p, usec_t *usec) {
7726 n = getxattr(p, "user.crtime_usec", &le, sizeof(le));
7729 if (n != sizeof(le))
7732 return parse_crtime(le, usec);
7735 int fd_setcrtime(int fd, usec_t usec) {
7741 usec = now(CLOCK_REALTIME);
7743 le = htole64((uint64_t) usec);
7744 if (fsetxattr(fd, "user.crtime_usec", &le, sizeof(le), 0) < 0)
7750 int chattr_fd(int fd, unsigned value, unsigned mask) {
7751 unsigned old_attr, new_attr;
7758 if (ioctl(fd, FS_IOC_GETFLAGS, &old_attr) < 0)
7761 new_attr = (old_attr & ~mask) | (value & mask);
7762 if (new_attr == old_attr)
7765 if (ioctl(fd, FS_IOC_SETFLAGS, &new_attr) < 0)
7771 int chattr_path(const char *p, unsigned value, unsigned mask) {
7772 _cleanup_close_ int fd = -1;
7779 fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
7783 return chattr_fd(fd, value, mask);
7786 int read_attr_fd(int fd, unsigned *ret) {
7789 if (ioctl(fd, FS_IOC_GETFLAGS, ret) < 0)
7795 int read_attr_path(const char *p, unsigned *ret) {
7796 _cleanup_close_ int fd = -1;
7801 fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
7805 return read_attr_fd(fd, ret);
7808 int make_lock_file(const char *p, int operation, LockFile *ret) {
7809 _cleanup_close_ int fd = -1;
7810 _cleanup_free_ char *t = NULL;
7814 * We use UNPOSIX locks if they are available. They have nice
7815 * semantics, and are mostly compatible with NFS. However,
7816 * they are only available on new kernels. When we detect we
7817 * are running on an older kernel, then we fall back to good
7818 * old BSD locks. They also have nice semantics, but are
7819 * slightly problematic on NFS, where they are upgraded to
7820 * POSIX locks, even though locally they are orthogonal to
7830 .l_type = (operation & ~LOCK_NB) == LOCK_EX ? F_WRLCK : F_RDLCK,
7831 .l_whence = SEEK_SET,
7835 fd = open(p, O_CREAT|O_RDWR|O_NOFOLLOW|O_CLOEXEC|O_NOCTTY, 0600);
7839 r = fcntl(fd, (operation & LOCK_NB) ? F_OFD_SETLK : F_OFD_SETLKW, &fl);
7842 /* If the kernel is too old, use good old BSD locks */
7843 if (errno == EINVAL)
7844 r = flock(fd, operation);
7847 return errno == EAGAIN ? -EBUSY : -errno;
7850 /* If we acquired the lock, let's check if the file
7851 * still exists in the file system. If not, then the
7852 * previous exclusive owner removed it and then closed
7853 * it. In such a case our acquired lock is worthless,
7854 * hence try again. */
7859 if (st.st_nlink > 0)
7862 fd = safe_close(fd);
7867 ret->operation = operation;
7875 int make_lock_file_for(const char *p, int operation, LockFile *ret) {
7883 if (!filename_is_valid(fn))
7886 t = newa(char, strlen(p) + 2 + 4 + 1);
7887 stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), fn), ".lck");
7889 return make_lock_file(t, operation, ret);
7892 void release_lock_file(LockFile *f) {
7900 /* If we are the exclusive owner we can safely delete
7901 * the lock file itself. If we are not the exclusive
7902 * owner, we can try becoming it. */
7905 (f->operation & ~LOCK_NB) == LOCK_SH) {
7906 static const struct flock fl = {
7908 .l_whence = SEEK_SET,
7911 r = fcntl(f->fd, F_OFD_SETLK, &fl);
7912 if (r < 0 && errno == EINVAL)
7913 r = flock(f->fd, LOCK_EX|LOCK_NB);
7916 f->operation = LOCK_EX|LOCK_NB;
7919 if ((f->operation & ~LOCK_NB) == LOCK_EX)
7920 unlink_noerrno(f->path);
7926 f->fd = safe_close(f->fd);
7930 static size_t nul_length(const uint8_t *p, size_t sz) {
7945 ssize_t sparse_write(int fd, const void *p, size_t sz, size_t run_length) {
7946 const uint8_t *q, *w, *e;
7954 n = nul_length(q, e - q);
7956 /* If there are more than the specified run length of
7957 * NUL bytes, or if this is the beginning or the end
7958 * of the buffer, then seek instead of write */
7959 if ((n > run_length) ||
7960 (n > 0 && q == p) ||
7961 (n > 0 && q + n >= e)) {
7963 l = write(fd, w, q - w);
7970 if (lseek(fd, n, SEEK_CUR) == (off_t) -1)
7982 l = write(fd, w, q - w);
7989 return q - (const uint8_t*) p;
7992 void sigkill_wait(pid_t *pid) {
7998 if (kill(*pid, SIGKILL) > 0)
7999 (void) wait_for_terminate(*pid, NULL);
8002 int syslog_parse_priority(const char **p, int *priority, bool with_facility) {
8003 int a = 0, b = 0, c = 0;
8013 if (!strchr(*p, '>'))
8016 if ((*p)[2] == '>') {
8017 c = undecchar((*p)[1]);
8019 } else if ((*p)[3] == '>') {
8020 b = undecchar((*p)[1]);
8021 c = undecchar((*p)[2]);
8023 } else if ((*p)[4] == '>') {
8024 a = undecchar((*p)[1]);
8025 b = undecchar((*p)[2]);
8026 c = undecchar((*p)[3]);
8031 if (a < 0 || b < 0 || c < 0 ||
8032 (!with_facility && (a || b || c > 7)))
8036 *priority = a*100 + b*10 + c;
8038 *priority = (*priority & LOG_FACMASK) | c;
8044 ssize_t string_table_lookup(const char * const *table, size_t len, const char *key) {
8050 for (i = 0; i < len; ++i)
8051 if (streq_ptr(table[i], key))
8057 void cmsg_close_all(struct msghdr *mh) {
8058 struct cmsghdr *cmsg;
8062 for (cmsg = CMSG_FIRSTHDR(mh); cmsg; cmsg = CMSG_NXTHDR(mh, cmsg))
8063 if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS)
8064 close_many((int*) CMSG_DATA(cmsg), (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int));
8067 int rename_noreplace(int olddirfd, const char *oldpath, int newdirfd, const char *newpath) {
8071 ret = renameat2(olddirfd, oldpath, newdirfd, newpath, RENAME_NOREPLACE);
8075 /* Even though renameat2() exists since Linux 3.15, btrfs added
8076 * support for it later. If it is not implemented, fallback to another
8078 if (errno != EINVAL)
8081 /* The link()/unlink() fallback does not work on directories. But
8082 * renameat() without RENAME_NOREPLACE gives the same semantics on
8083 * directories, except when newpath is an *empty* directory. This is
8085 ret = fstatat(olddirfd, oldpath, &buf, AT_SYMLINK_NOFOLLOW);
8086 if (ret >= 0 && S_ISDIR(buf.st_mode)) {
8087 ret = renameat(olddirfd, oldpath, newdirfd, newpath);
8088 return ret >= 0 ? 0 : -errno;
8091 /* If it is not a directory, use the link()/unlink() fallback. */
8092 ret = linkat(olddirfd, oldpath, newdirfd, newpath, 0);
8096 ret = unlinkat(olddirfd, oldpath, 0);
8098 /* backup errno before the following unlinkat() alters it */
8100 (void) unlinkat(newdirfd, newpath, 0);
8108 char *shell_maybe_quote(const char *s) {
8114 /* Encloses a string in double quotes if necessary to make it
8115 * OK as shell string. */
8117 for (p = s; *p; p++)
8120 strchr(SHELL_NEED_QUOTES, *p))
8126 r = new(char, 1+strlen(s)*2+1+1);
8132 t = mempcpy(t, s, p - s);
8136 if (strchr(SHELL_NEED_ESCAPE, *p))