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>
42 #include <sys/inotify.h>
46 #include <sys/prctl.h>
47 #include <sys/utsname.h>
49 #include <netinet/ip.h>
58 #include <linux/magic.h>
71 #include "path-util.h"
72 #include "exit-status.h"
78 char **saved_argv = NULL;
80 static volatile unsigned cached_columns = 0;
81 static volatile unsigned cached_lines = 0;
83 #define PROCFS_PATH_LEN (sizeof("/proc/")-1 + DECIMAL_STR_MAX(pid_t))
85 #define FORMAT_PROCFS_PATH(buffer, path, pid) \
87 assert_cc(sizeof(buffer) == (PROCFS_PATH_LEN + 1 + sizeof(path))); \
88 snprintf(buffer, sizeof(buffer) - 1, "/proc/%lu/%s", (unsigned long) pid, path); \
89 char_array_0(buffer); \
93 size_t page_size(void) {
94 static __thread size_t pgsz = 0;
97 if (_likely_(pgsz > 0))
100 r = sysconf(_SC_PAGESIZE);
107 bool streq_ptr(const char *a, const char *b) {
109 /* Like streq(), but tries to make sense of NULL pointers */
120 char* endswith(const char *s, const char *postfix) {
127 pl = strlen(postfix);
130 return (char*) s + sl;
135 if (memcmp(s + sl - pl, postfix, pl) != 0)
138 return (char*) s + sl - pl;
141 char* startswith(const char *s, const char *prefix) {
158 char* startswith_no_case(const char *s, const char *prefix) {
168 if (tolower(*a) != tolower(*b))
175 bool first_word(const char *s, const char *word) {
190 if (memcmp(s, word, wl) != 0)
194 strchr(WHITESPACE, s[wl]);
197 int close_nointr(int fd) {
203 /* Just ignore EINTR; a retry loop is the wrong
204 * thing to do on Linux.
206 * http://lkml.indiana.edu/hypermail/linux/kernel/0509.1/0877.html
207 * https://bugzilla.gnome.org/show_bug.cgi?id=682819
208 * http://utcc.utoronto.ca/~cks/space/blog/unix/CloseEINTR
209 * https://sites.google.com/site/michaelsafyan/software-engineering/checkforeintrwheninvokingclosethinkagain
211 if (_unlikely_(r < 0 && errno == EINTR))
219 void close_nointr_nofail(int fd) {
222 /* like close_nointr() but cannot fail, and guarantees errno
225 assert_se(close_nointr(fd) == 0);
228 void close_many(const int fds[], unsigned n_fd) {
231 assert(fds || n_fd <= 0);
233 for (i = 0; i < n_fd; i++)
234 close_nointr_nofail(fds[i]);
237 int unlink_noerrno(const char *path) {
248 int parse_boolean(const char *v) {
251 if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || strcaseeq(v, "on"))
253 else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || strcaseeq(v, "off"))
259 int parse_pid(const char *s, pid_t* ret_pid) {
260 unsigned long ul = 0;
267 r = safe_atolu(s, &ul);
273 if ((unsigned long) pid != ul)
283 int parse_uid(const char *s, uid_t* ret_uid) {
284 unsigned long ul = 0;
291 r = safe_atolu(s, &ul);
297 if ((unsigned long) uid != ul)
304 int safe_atou(const char *s, unsigned *ret_u) {
312 l = strtoul(s, &x, 0);
314 if (!x || x == s || *x || errno)
315 return errno > 0 ? -errno : -EINVAL;
317 if ((unsigned long) (unsigned) l != l)
320 *ret_u = (unsigned) l;
324 int safe_atoi(const char *s, int *ret_i) {
332 l = strtol(s, &x, 0);
334 if (!x || x == s || *x || errno)
335 return errno > 0 ? -errno : -EINVAL;
337 if ((long) (int) l != l)
344 int safe_atollu(const char *s, long long unsigned *ret_llu) {
346 unsigned long long l;
352 l = strtoull(s, &x, 0);
354 if (!x || x == s || *x || errno)
355 return errno ? -errno : -EINVAL;
361 int safe_atolli(const char *s, long long int *ret_lli) {
369 l = strtoll(s, &x, 0);
371 if (!x || x == s || *x || errno)
372 return errno ? -errno : -EINVAL;
378 int safe_atod(const char *s, double *ret_d) {
388 if (!x || x == s || *x || errno)
389 return errno ? -errno : -EINVAL;
395 /* Split a string into words. */
396 char *split(const char *c, size_t *l, const char *separator, char **state) {
399 current = *state ? *state : (char*) c;
401 if (!*current || *c == 0)
404 current += strspn(current, separator);
405 *l = strcspn(current, separator);
408 return (char*) current;
411 /* Split a string into words, but consider strings enclosed in '' and
412 * "" as words even if they include spaces. */
413 char *split_quoted(const char *c, size_t *l, char **state) {
415 bool escaped = false;
417 current = *state ? *state : (char*) c;
419 if (!*current || *c == 0)
422 current += strspn(current, WHITESPACE);
424 if (*current == '\'') {
427 for (e = current; *e; e++) {
437 *state = *e == 0 ? e : e+1;
438 } else if (*current == '\"') {
441 for (e = current; *e; e++) {
451 *state = *e == 0 ? e : e+1;
453 for (e = current; *e; e++) {
458 else if (strchr(WHITESPACE, *e))
465 return (char*) current;
468 int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
470 _cleanup_fclose_ FILE *f = NULL;
471 char fn[sizeof("/proc/")-1 + DECIMAL_STR_MAX(pid_t) + sizeof("/stat")], line[LINE_MAX], *p;
477 assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1));
483 if (!fgets(line, sizeof(line), f)) {
484 r = feof(f) ? -EIO : -errno;
488 /* Let's skip the pid and comm fields. The latter is enclosed
489 * in () but does not escape any () in its value, so let's
490 * skip over it manually */
492 p = strrchr(line, ')');
504 if ((long unsigned) (pid_t) ppid != ppid)
507 *_ppid = (pid_t) ppid;
512 int get_starttime_of_pid(pid_t pid, unsigned long long *st) {
513 _cleanup_fclose_ FILE *f = NULL;
514 char fn[sizeof("/proc/")-1 + DECIMAL_STR_MAX(pid_t) + sizeof("/stat")], line[LINE_MAX], *p;
519 assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1));
525 if (!fgets(line, sizeof(line), f)) {
532 /* Let's skip the pid and comm fields. The latter is enclosed
533 * in () but does not escape any () in its value, so let's
534 * skip over it manually */
536 p = strrchr(line, ')');
558 "%*d " /* priority */
560 "%*d " /* num_threads */
561 "%*d " /* itrealvalue */
562 "%llu " /* starttime */,
569 int fchmod_umask(int fd, mode_t m) {
574 r = fchmod(fd, m & (~u)) < 0 ? -errno : 0;
580 char *truncate_nl(char *s) {
583 s[strcspn(s, NEWLINE)] = 0;
587 int get_process_comm(pid_t pid, char **name) {
593 r = read_one_line_file("/proc/self/comm", name);
595 char path[PROCFS_PATH_LEN + sizeof("/comm")];
596 FORMAT_PROCFS_PATH(path, "comm", pid);
597 r = read_one_line_file(path, name);
603 int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) {
611 f = fopen("/proc/self/cmdline", "re");
613 char path[PROCFS_PATH_LEN + sizeof("/cmdline")];
614 FORMAT_PROCFS_PATH(path, "cmdline", pid);
615 f = fopen(path, "re");
620 if (max_length == 0) {
622 while ((c = getc(f)) != EOF) {
623 k = realloc(r, len+1);
630 r[len-1] = isprint(c) ? c : ' ';
637 r = new(char, max_length);
645 while ((c = getc(f)) != EOF) {
667 size_t n = MIN(left-1, 3U);
676 /* Kernel threads have no argv[] */
677 if (r == NULL || r[0] == 0) {
686 h = get_process_comm(pid, &t);
690 r = strjoin("[", t, "]", NULL);
701 int is_kernel_thread(pid_t pid) {
702 char path[PROCFS_PATH_LEN + sizeof("/cmdline")];
711 FORMAT_PROCFS_PATH(path, "cmdline", pid);
712 f = fopen(path, "re");
717 count = fread(&c, 1, 1, f);
721 /* Kernel threads have an empty cmdline */
724 return eof ? 1 : -errno;
729 int get_process_exe(pid_t pid, char **name) {
735 r = readlink_malloc("/proc/self/exe", name);
737 char path[PROCFS_PATH_LEN + sizeof("/exe")];
738 FORMAT_PROCFS_PATH(path, "exe", pid);
739 r = readlink_malloc(path, name);
745 static int get_process_id(pid_t pid, const char *field, uid_t *uid) {
746 _cleanup_fclose_ FILE *f = NULL;
747 char path[PROCFS_PATH_LEN + sizeof("/status")];
756 FORMAT_PROCFS_PATH(path, "status", pid);
757 f = fopen(path, "re");
761 FOREACH_LINE(line, f, return -errno) {
766 if (startswith(l, field)) {
768 l += strspn(l, WHITESPACE);
770 l[strcspn(l, WHITESPACE)] = 0;
772 return parse_uid(l, uid);
779 int get_process_uid(pid_t pid, uid_t *uid) {
780 return get_process_id(pid, "Uid:", uid);
783 int get_process_gid(pid_t pid, gid_t *gid) {
784 return get_process_id(pid, "Gid:", gid);
787 char *strnappend(const char *s, const char *suffix, size_t b) {
795 return strndup(suffix, b);
804 if (b > ((size_t) -1) - a)
807 r = new(char, a+b+1);
812 memcpy(r+a, suffix, b);
818 char *strappend(const char *s, const char *suffix) {
819 return strnappend(s, suffix, suffix ? strlen(suffix) : 0);
822 int readlink_malloc(const char *p, char **r) {
832 if (!(c = new(char, l)))
835 if ((n = readlink(p, c, l-1)) < 0) {
841 if ((size_t) n < l-1) {
852 int readlink_and_make_absolute(const char *p, char **r) {
859 if ((j = readlink_malloc(p, &target)) < 0)
862 k = file_in_same_dir(p, target);
872 int readlink_and_canonicalize(const char *p, char **r) {
879 j = readlink_and_make_absolute(p, &t);
883 s = canonicalize_file_name(t);
890 path_kill_slashes(*r);
895 int reset_all_signal_handlers(void) {
898 for (sig = 1; sig < _NSIG; sig++) {
899 struct sigaction sa = {
900 .sa_handler = SIG_DFL,
901 .sa_flags = SA_RESTART,
904 if (sig == SIGKILL || sig == SIGSTOP)
907 /* On Linux the first two RT signals are reserved by
908 * glibc, and sigaction() will return EINVAL for them. */
909 if ((sigaction(sig, &sa, NULL) < 0))
917 char *strstrip(char *s) {
920 /* Drops trailing whitespace. Modifies the string in
921 * place. Returns pointer to first non-space character */
923 s += strspn(s, WHITESPACE);
925 for (e = strchr(s, 0); e > s; e --)
926 if (!strchr(WHITESPACE, e[-1]))
934 char *delete_chars(char *s, const char *bad) {
937 /* Drops all whitespace, regardless where in the string */
939 for (f = s, t = s; *f; f++) {
951 bool in_charset(const char *s, const char* charset) {
958 if (!strchr(charset, *i))
964 char *file_in_same_dir(const char *path, const char *filename) {
971 /* This removes the last component of path and appends
972 * filename, unless the latter is absolute anyway or the
975 if (path_is_absolute(filename))
976 return strdup(filename);
978 if (!(e = strrchr(path, '/')))
979 return strdup(filename);
981 k = strlen(filename);
982 if (!(r = new(char, e-path+1+k+1)))
985 memcpy(r, path, e-path+1);
986 memcpy(r+(e-path)+1, filename, k+1);
991 int rmdir_parents(const char *path, const char *stop) {
1000 /* Skip trailing slashes */
1001 while (l > 0 && path[l-1] == '/')
1007 /* Skip last component */
1008 while (l > 0 && path[l-1] != '/')
1011 /* Skip trailing slashes */
1012 while (l > 0 && path[l-1] == '/')
1018 if (!(t = strndup(path, l)))
1021 if (path_startswith(stop, t)) {
1030 if (errno != ENOENT)
1037 char hexchar(int x) {
1038 static const char table[16] = "0123456789abcdef";
1040 return table[x & 15];
1043 int unhexchar(char c) {
1045 if (c >= '0' && c <= '9')
1048 if (c >= 'a' && c <= 'f')
1049 return c - 'a' + 10;
1051 if (c >= 'A' && c <= 'F')
1052 return c - 'A' + 10;
1057 char *hexmem(const void *p, size_t l) {
1061 z = r = malloc(l * 2 + 1);
1065 for (x = p; x < (const uint8_t*) p + l; x++) {
1066 *(z++) = hexchar(*x >> 4);
1067 *(z++) = hexchar(*x & 15);
1074 void *unhexmem(const char *p, size_t l) {
1080 z = r = malloc((l + 1) / 2 + 1);
1084 for (x = p; x < p + l; x += 2) {
1087 a = unhexchar(x[0]);
1089 b = unhexchar(x[1]);
1093 *(z++) = (uint8_t) a << 4 | (uint8_t) b;
1100 char octchar(int x) {
1101 return '0' + (x & 7);
1104 int unoctchar(char c) {
1106 if (c >= '0' && c <= '7')
1112 char decchar(int x) {
1113 return '0' + (x % 10);
1116 int undecchar(char c) {
1118 if (c >= '0' && c <= '9')
1124 char *cescape(const char *s) {
1130 /* Does C style string escaping. */
1132 r = new(char, strlen(s)*4 + 1);
1136 for (f = s, t = r; *f; f++)
1182 /* For special chars we prefer octal over
1183 * hexadecimal encoding, simply because glib's
1184 * g_strescape() does the same */
1185 if ((*f < ' ') || (*f >= 127)) {
1187 *(t++) = octchar((unsigned char) *f >> 6);
1188 *(t++) = octchar((unsigned char) *f >> 3);
1189 *(t++) = octchar((unsigned char) *f);
1200 char *cunescape_length_with_prefix(const char *s, size_t length, const char *prefix) {
1207 /* Undoes C style string escaping, and optionally prefixes it. */
1209 pl = prefix ? strlen(prefix) : 0;
1211 r = new(char, pl+length+1);
1216 memcpy(r, prefix, pl);
1218 for (f = s, t = r + pl; f < s + length; f++) {
1261 /* This is an extension of the XDG syntax files */
1266 /* hexadecimal encoding */
1269 a = unhexchar(f[1]);
1270 b = unhexchar(f[2]);
1272 if (a < 0 || b < 0) {
1273 /* Invalid escape code, let's take it literal then */
1277 *(t++) = (char) ((a << 4) | b);
1292 /* octal encoding */
1295 a = unoctchar(f[0]);
1296 b = unoctchar(f[1]);
1297 c = unoctchar(f[2]);
1299 if (a < 0 || b < 0 || c < 0) {
1300 /* Invalid escape code, let's take it literal then */
1304 *(t++) = (char) ((a << 6) | (b << 3) | c);
1312 /* premature end of string.*/
1317 /* Invalid escape code, let's take it literal then */
1329 char *cunescape_length(const char *s, size_t length) {
1330 return cunescape_length_with_prefix(s, length, NULL);
1333 char *cunescape(const char *s) {
1336 return cunescape_length(s, strlen(s));
1339 char *xescape(const char *s, const char *bad) {
1343 /* Escapes all chars in bad, in addition to \ and all special
1344 * chars, in \xFF style escaping. May be reversed with
1347 r = new(char, strlen(s) * 4 + 1);
1351 for (f = s, t = r; *f; f++) {
1353 if ((*f < ' ') || (*f >= 127) ||
1354 (*f == '\\') || strchr(bad, *f)) {
1357 *(t++) = hexchar(*f >> 4);
1358 *(t++) = hexchar(*f);
1368 char *bus_path_escape(const char *s) {
1374 /* Escapes all chars that D-Bus' object path cannot deal
1375 * with. Can be reverse with bus_path_unescape(). We special
1376 * case the empty string. */
1381 r = new(char, strlen(s)*3 + 1);
1385 for (f = s, t = r; *f; f++) {
1387 /* Escape everything that is not a-zA-Z0-9. We also
1388 * escape 0-9 if it's the first character */
1390 if (!(*f >= 'A' && *f <= 'Z') &&
1391 !(*f >= 'a' && *f <= 'z') &&
1392 !(f > s && *f >= '0' && *f <= '9')) {
1394 *(t++) = hexchar(*f >> 4);
1395 *(t++) = hexchar(*f);
1405 char *bus_path_unescape(const char *f) {
1410 /* Special case for the empty string */
1414 r = new(char, strlen(f) + 1);
1418 for (t = r; *f; f++) {
1423 if ((a = unhexchar(f[1])) < 0 ||
1424 (b = unhexchar(f[2])) < 0) {
1425 /* Invalid escape code, let's take it literal then */
1428 *(t++) = (char) ((a << 4) | b);
1440 char *ascii_strlower(char *t) {
1445 for (p = t; *p; p++)
1446 if (*p >= 'A' && *p <= 'Z')
1447 *p = *p - 'A' + 'a';
1452 static bool ignore_file_allow_backup(const char *filename) {
1456 filename[0] == '.' ||
1457 streq(filename, "lost+found") ||
1458 streq(filename, "aquota.user") ||
1459 streq(filename, "aquota.group") ||
1460 endswith(filename, ".rpmnew") ||
1461 endswith(filename, ".rpmsave") ||
1462 endswith(filename, ".rpmorig") ||
1463 endswith(filename, ".dpkg-old") ||
1464 endswith(filename, ".dpkg-new") ||
1465 endswith(filename, ".swp");
1468 bool ignore_file(const char *filename) {
1471 if (endswith(filename, "~"))
1474 return ignore_file_allow_backup(filename);
1477 int fd_nonblock(int fd, bool nonblock) {
1482 if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
1486 flags |= O_NONBLOCK;
1488 flags &= ~O_NONBLOCK;
1490 if (fcntl(fd, F_SETFL, flags) < 0)
1496 int fd_cloexec(int fd, bool cloexec) {
1501 if ((flags = fcntl(fd, F_GETFD, 0)) < 0)
1505 flags |= FD_CLOEXEC;
1507 flags &= ~FD_CLOEXEC;
1509 if (fcntl(fd, F_SETFD, flags) < 0)
1515 static bool fd_in_set(int fd, const int fdset[], unsigned n_fdset) {
1518 assert(n_fdset == 0 || fdset);
1520 for (i = 0; i < n_fdset; i++)
1527 int close_all_fds(const int except[], unsigned n_except) {
1532 assert(n_except == 0 || except);
1534 d = opendir("/proc/self/fd");
1539 /* When /proc isn't available (for example in chroots)
1540 * the fallback is brute forcing through the fd
1543 assert_se(getrlimit(RLIMIT_NOFILE, &rl) >= 0);
1544 for (fd = 3; fd < (int) rl.rlim_max; fd ++) {
1546 if (fd_in_set(fd, except, n_except))
1549 if (close_nointr(fd) < 0)
1550 if (errno != EBADF && r == 0)
1557 while ((de = readdir(d))) {
1560 if (ignore_file(de->d_name))
1563 if (safe_atoi(de->d_name, &fd) < 0)
1564 /* Let's better ignore this, just in case */
1573 if (fd_in_set(fd, except, n_except))
1576 if (close_nointr(fd) < 0) {
1577 /* Valgrind has its own FD and doesn't want to have it closed */
1578 if (errno != EBADF && r == 0)
1587 bool chars_intersect(const char *a, const char *b) {
1590 /* Returns true if any of the chars in a are in b. */
1591 for (p = a; *p; p++)
1598 bool fstype_is_network(const char *fstype) {
1599 static const char table[] =
1608 return nulstr_contains(table, fstype);
1612 _cleanup_close_ int fd;
1614 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
1620 TIOCL_GETKMSGREDIRECT,
1624 if (ioctl(fd, TIOCLINUX, tiocl) < 0)
1627 vt = tiocl[0] <= 0 ? 1 : tiocl[0];
1630 if (ioctl(fd, VT_ACTIVATE, vt) < 0)
1636 int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
1637 struct termios old_termios, new_termios;
1639 char line[LINE_MAX];
1644 if (tcgetattr(fileno(f), &old_termios) >= 0) {
1645 new_termios = old_termios;
1647 new_termios.c_lflag &= ~ICANON;
1648 new_termios.c_cc[VMIN] = 1;
1649 new_termios.c_cc[VTIME] = 0;
1651 if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
1654 if (t != (usec_t) -1) {
1655 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) {
1656 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
1661 k = fread(&c, 1, 1, f);
1663 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
1669 *need_nl = c != '\n';
1676 if (t != (usec_t) -1)
1677 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0)
1680 if (!fgets(line, sizeof(line), f))
1685 if (strlen(line) != 1)
1695 int ask(char *ret, const char *replies, const char *text, ...) {
1705 bool need_nl = true;
1708 fputs(ANSI_HIGHLIGHT_ON, stdout);
1715 fputs(ANSI_HIGHLIGHT_OFF, stdout);
1719 r = read_one_char(stdin, &c, (usec_t) -1, &need_nl);
1722 if (r == -EBADMSG) {
1723 puts("Bad input, please try again.");
1734 if (strchr(replies, c)) {
1739 puts("Read unexpected character, please try again.");
1743 int reset_terminal_fd(int fd, bool switch_to_text) {
1744 struct termios termios;
1747 /* Set terminal to some sane defaults */
1751 /* We leave locked terminal attributes untouched, so that
1752 * Plymouth may set whatever it wants to set, and we don't
1753 * interfere with that. */
1755 /* Disable exclusive mode, just in case */
1756 ioctl(fd, TIOCNXCL);
1758 /* Switch to text mode */
1760 ioctl(fd, KDSETMODE, KD_TEXT);
1762 /* Enable console unicode mode */
1763 ioctl(fd, KDSKBMODE, K_UNICODE);
1765 if (tcgetattr(fd, &termios) < 0) {
1770 /* We only reset the stuff that matters to the software. How
1771 * hardware is set up we don't touch assuming that somebody
1772 * else will do that for us */
1774 termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
1775 termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
1776 termios.c_oflag |= ONLCR;
1777 termios.c_cflag |= CREAD;
1778 termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
1780 termios.c_cc[VINTR] = 03; /* ^C */
1781 termios.c_cc[VQUIT] = 034; /* ^\ */
1782 termios.c_cc[VERASE] = 0177;
1783 termios.c_cc[VKILL] = 025; /* ^X */
1784 termios.c_cc[VEOF] = 04; /* ^D */
1785 termios.c_cc[VSTART] = 021; /* ^Q */
1786 termios.c_cc[VSTOP] = 023; /* ^S */
1787 termios.c_cc[VSUSP] = 032; /* ^Z */
1788 termios.c_cc[VLNEXT] = 026; /* ^V */
1789 termios.c_cc[VWERASE] = 027; /* ^W */
1790 termios.c_cc[VREPRINT] = 022; /* ^R */
1791 termios.c_cc[VEOL] = 0;
1792 termios.c_cc[VEOL2] = 0;
1794 termios.c_cc[VTIME] = 0;
1795 termios.c_cc[VMIN] = 1;
1797 if (tcsetattr(fd, TCSANOW, &termios) < 0)
1801 /* Just in case, flush all crap out */
1802 tcflush(fd, TCIOFLUSH);
1807 int reset_terminal(const char *name) {
1810 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
1814 r = reset_terminal_fd(fd, true);
1815 close_nointr_nofail(fd);
1820 int open_terminal(const char *name, int mode) {
1825 * If a TTY is in the process of being closed opening it might
1826 * cause EIO. This is horribly awful, but unlikely to be
1827 * changed in the kernel. Hence we work around this problem by
1828 * retrying a couple of times.
1830 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
1834 fd = open(name, mode);
1841 /* Max 1s in total */
1845 usleep(50 * USEC_PER_MSEC);
1854 close_nointr_nofail(fd);
1859 close_nointr_nofail(fd);
1866 int flush_fd(int fd) {
1867 struct pollfd pollfd = {
1877 r = poll(&pollfd, 1, 0);
1887 l = read(fd, buf, sizeof(buf));
1893 if (errno == EAGAIN)
1902 int acquire_terminal(
1906 bool ignore_tiocstty_eperm,
1909 int fd = -1, notify = -1, r = 0, wd = -1;
1914 /* We use inotify to be notified when the tty is closed. We
1915 * create the watch before checking if we can actually acquire
1916 * it, so that we don't lose any event.
1918 * Note: strictly speaking this actually watches for the
1919 * device being closed, it does *not* really watch whether a
1920 * tty loses its controlling process. However, unless some
1921 * rogue process uses TIOCNOTTY on /dev/tty *after* closing
1922 * its tty otherwise this will not become a problem. As long
1923 * as the administrator makes sure not configure any service
1924 * on the same tty as an untrusted user this should not be a
1925 * problem. (Which he probably should not do anyway.) */
1927 if (timeout != (usec_t) -1)
1928 ts = now(CLOCK_MONOTONIC);
1930 if (!fail && !force) {
1931 notify = inotify_init1(IN_CLOEXEC | (timeout != (usec_t) -1 ? IN_NONBLOCK : 0));
1937 wd = inotify_add_watch(notify, name, IN_CLOSE);
1945 struct sigaction sa_old, sa_new = {
1946 .sa_handler = SIG_IGN,
1947 .sa_flags = SA_RESTART,
1951 r = flush_fd(notify);
1956 /* We pass here O_NOCTTY only so that we can check the return
1957 * value TIOCSCTTY and have a reliable way to figure out if we
1958 * successfully became the controlling process of the tty */
1959 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
1963 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
1964 * if we already own the tty. */
1965 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
1967 /* First, try to get the tty */
1968 if (ioctl(fd, TIOCSCTTY, force) < 0)
1971 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
1973 /* Sometimes it makes sense to ignore TIOCSCTTY
1974 * returning EPERM, i.e. when very likely we already
1975 * are have this controlling terminal. */
1976 if (r < 0 && r == -EPERM && ignore_tiocstty_eperm)
1979 if (r < 0 && (force || fail || r != -EPERM)) {
1988 assert(notify >= 0);
1991 uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
1993 struct inotify_event *e;
1995 if (timeout != (usec_t) -1) {
1998 n = now(CLOCK_MONOTONIC);
1999 if (ts + timeout < n) {
2004 r = fd_wait_for_event(fd, POLLIN, ts + timeout - n);
2014 l = read(notify, inotify_buffer, sizeof(inotify_buffer));
2017 if (errno == EINTR || errno == EAGAIN)
2024 e = (struct inotify_event*) inotify_buffer;
2029 if (e->wd != wd || !(e->mask & IN_CLOSE)) {
2034 step = sizeof(struct inotify_event) + e->len;
2035 assert(step <= (size_t) l);
2037 e = (struct inotify_event*) ((uint8_t*) e + step);
2044 /* We close the tty fd here since if the old session
2045 * ended our handle will be dead. It's important that
2046 * we do this after sleeping, so that we don't enter
2047 * an endless loop. */
2048 close_nointr_nofail(fd);
2052 close_nointr_nofail(notify);
2054 r = reset_terminal_fd(fd, true);
2056 log_warning("Failed to reset terminal: %s", strerror(-r));
2062 close_nointr_nofail(fd);
2065 close_nointr_nofail(notify);
2070 int release_terminal(void) {
2072 struct sigaction sa_old, sa_new = {
2073 .sa_handler = SIG_IGN,
2074 .sa_flags = SA_RESTART,
2076 int _cleanup_close_ fd;
2078 fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC);
2082 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
2083 * by our own TIOCNOTTY */
2084 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
2086 if (ioctl(fd, TIOCNOTTY) < 0)
2089 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
2094 int sigaction_many(const struct sigaction *sa, ...) {
2099 while ((sig = va_arg(ap, int)) > 0)
2100 if (sigaction(sig, sa, NULL) < 0)
2107 int ignore_signals(int sig, ...) {
2108 struct sigaction sa = {
2109 .sa_handler = SIG_IGN,
2110 .sa_flags = SA_RESTART,
2116 if (sigaction(sig, &sa, NULL) < 0)
2120 while ((sig = va_arg(ap, int)) > 0)
2121 if (sigaction(sig, &sa, NULL) < 0)
2128 int default_signals(int sig, ...) {
2129 struct sigaction sa = {
2130 .sa_handler = SIG_DFL,
2131 .sa_flags = SA_RESTART,
2136 if (sigaction(sig, &sa, NULL) < 0)
2140 while ((sig = va_arg(ap, int)) > 0)
2141 if (sigaction(sig, &sa, NULL) < 0)
2148 int close_pipe(int p[]) {
2154 a = close_nointr(p[0]);
2159 b = close_nointr(p[1]);
2163 return a < 0 ? a : b;
2166 ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) {
2175 while (nbytes > 0) {
2178 if ((k = read(fd, p, nbytes)) <= 0) {
2180 if (k < 0 && errno == EINTR)
2183 if (k < 0 && errno == EAGAIN && do_poll) {
2184 struct pollfd pollfd = {
2189 if (poll(&pollfd, 1, -1) < 0) {
2193 return n > 0 ? n : -errno;
2196 if (pollfd.revents != POLLIN)
2197 return n > 0 ? n : -EIO;
2202 return n > 0 ? n : (k < 0 ? -errno : 0);
2213 ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) {
2222 while (nbytes > 0) {
2225 k = write(fd, p, nbytes);
2228 if (k < 0 && errno == EINTR)
2231 if (k < 0 && errno == EAGAIN && do_poll) {
2232 struct pollfd pollfd = {
2237 if (poll(&pollfd, 1, -1) < 0) {
2241 return n > 0 ? n : -errno;
2244 if (pollfd.revents != POLLOUT)
2245 return n > 0 ? n : -EIO;
2250 return n > 0 ? n : (k < 0 ? -errno : 0);
2261 int parse_bytes(const char *t, off_t *bytes) {
2262 static const struct {
2268 { "M", 1024ULL*1024ULL },
2269 { "G", 1024ULL*1024ULL*1024ULL },
2270 { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
2271 { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
2272 { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
2289 l = strtoll(p, &e, 10);
2300 e += strspn(e, WHITESPACE);
2302 for (i = 0; i < ELEMENTSOF(table); i++)
2303 if (startswith(e, table[i].suffix)) {
2304 r += (off_t) l * table[i].factor;
2305 p = e + strlen(table[i].suffix);
2309 if (i >= ELEMENTSOF(table))
2319 int make_stdio(int fd) {
2324 r = dup3(fd, STDIN_FILENO, 0);
2325 s = dup3(fd, STDOUT_FILENO, 0);
2326 t = dup3(fd, STDERR_FILENO, 0);
2329 close_nointr_nofail(fd);
2331 if (r < 0 || s < 0 || t < 0)
2334 /* We rely here that the new fd has O_CLOEXEC not set */
2339 int make_null_stdio(void) {
2342 null_fd = open("/dev/null", O_RDWR|O_NOCTTY);
2346 return make_stdio(null_fd);
2349 bool is_device_path(const char *path) {
2351 /* Returns true on paths that refer to a device, either in
2352 * sysfs or in /dev */
2355 path_startswith(path, "/dev/") ||
2356 path_startswith(path, "/sys/");
2359 int dir_is_empty(const char *path) {
2360 _cleanup_closedir_ DIR *d;
2369 union dirent_storage buf;
2371 r = readdir_r(d, &buf.de, &de);
2378 if (!ignore_file(de->d_name))
2383 char* dirname_malloc(const char *path) {
2384 char *d, *dir, *dir2;
2401 unsigned long long random_ull(void) {
2402 _cleanup_close_ int fd;
2406 fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY);
2410 r = loop_read(fd, &ull, sizeof(ull), true);
2411 if (r != sizeof(ull))
2417 return random() * RAND_MAX + random();
2420 void rename_process(const char name[8]) {
2423 /* This is a like a poor man's setproctitle(). It changes the
2424 * comm field, argv[0], and also the glibc's internally used
2425 * name of the process. For the first one a limit of 16 chars
2426 * applies, to the second one usually one of 10 (i.e. length
2427 * of "/sbin/init"), to the third one one of 7 (i.e. length of
2428 * "systemd"). If you pass a longer string it will be
2431 prctl(PR_SET_NAME, name);
2433 if (program_invocation_name)
2434 strncpy(program_invocation_name, name, strlen(program_invocation_name));
2436 if (saved_argc > 0) {
2440 strncpy(saved_argv[0], name, strlen(saved_argv[0]));
2442 for (i = 1; i < saved_argc; i++) {
2446 memset(saved_argv[i], 0, strlen(saved_argv[i]));
2451 void sigset_add_many(sigset_t *ss, ...) {
2458 while ((sig = va_arg(ap, int)) > 0)
2459 assert_se(sigaddset(ss, sig) == 0);
2463 char* gethostname_malloc(void) {
2466 assert_se(uname(&u) >= 0);
2468 if (!isempty(u.nodename) && !streq(u.nodename, "(none)"))
2469 return strdup(u.nodename);
2471 return strdup(u.sysname);
2474 bool hostname_is_set(void) {
2477 assert_se(uname(&u) >= 0);
2479 return !isempty(u.nodename) && !streq(u.nodename, "(none)");
2482 static char *lookup_uid(uid_t uid) {
2485 _cleanup_free_ char *buf = NULL;
2486 struct passwd pwbuf, *pw = NULL;
2488 /* Shortcut things to avoid NSS lookups */
2490 return strdup("root");
2492 bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
2496 buf = malloc(bufsize);
2500 if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw)
2501 return strdup(pw->pw_name);
2503 if (asprintf(&name, "%lu", (unsigned long) uid) < 0)
2509 char* getlogname_malloc(void) {
2513 if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0)
2518 return lookup_uid(uid);
2521 char *getusername_malloc(void) {
2528 return lookup_uid(getuid());
2531 int getttyname_malloc(int fd, char **r) {
2532 char path[PATH_MAX], *c;
2537 k = ttyname_r(fd, path, sizeof(path));
2543 c = strdup(startswith(path, "/dev/") ? path + 5 : path);
2551 int getttyname_harder(int fd, char **r) {
2555 k = getttyname_malloc(fd, &s);
2559 if (streq(s, "tty")) {
2561 return get_ctty(0, NULL, r);
2568 int get_ctty_devnr(pid_t pid, dev_t *d) {
2570 char line[LINE_MAX], *p, *fn;
2571 unsigned long ttynr;
2574 if (asprintf(&fn, "/proc/%lu/stat", (unsigned long) (pid <= 0 ? getpid() : pid)) < 0)
2577 f = fopen(fn, "re");
2582 if (!fgets(line, sizeof(line), f)) {
2583 k = feof(f) ? -EIO : -errno;
2590 p = strrchr(line, ')');
2600 "%*d " /* session */
2605 if (major(ttynr) == 0 && minor(ttynr) == 0)
2612 int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
2614 char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *s, *b, *p;
2619 k = get_ctty_devnr(pid, &devnr);
2623 snprintf(fn, sizeof(fn), "/dev/char/%u:%u", major(devnr), minor(devnr));
2625 k = readlink_malloc(fn, &s);
2631 /* This is an ugly hack */
2632 if (major(devnr) == 136) {
2633 if (asprintf(&b, "pts/%lu", (unsigned long) minor(devnr)) < 0)
2643 /* Probably something like the ptys which have no
2644 * symlink in /dev/char. Let's return something
2645 * vaguely useful. */
2658 if (startswith(s, "/dev/"))
2660 else if (startswith(s, "../"))
2678 int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) {
2684 /* This returns the first error we run into, but nevertheless
2685 * tries to go on. This closes the passed fd. */
2689 close_nointr_nofail(fd);
2691 return errno == ENOENT ? 0 : -errno;
2696 union dirent_storage buf;
2697 bool is_dir, keep_around;
2701 r = readdir_r(d, &buf.de, &de);
2702 if (r != 0 && ret == 0) {
2710 if (streq(de->d_name, ".") || streq(de->d_name, ".."))
2713 if (de->d_type == DT_UNKNOWN ||
2715 (de->d_type == DT_DIR && root_dev)) {
2716 if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
2717 if (ret == 0 && errno != ENOENT)
2722 is_dir = S_ISDIR(st.st_mode);
2725 (st.st_uid == 0 || st.st_uid == getuid()) &&
2726 (st.st_mode & S_ISVTX);
2728 is_dir = de->d_type == DT_DIR;
2729 keep_around = false;
2735 /* if root_dev is set, remove subdirectories only, if device is same as dir */
2736 if (root_dev && st.st_dev != root_dev->st_dev)
2739 subdir_fd = openat(fd, de->d_name,
2740 O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
2741 if (subdir_fd < 0) {
2742 if (ret == 0 && errno != ENOENT)
2747 r = rm_rf_children_dangerous(subdir_fd, only_dirs, honour_sticky, root_dev);
2748 if (r < 0 && ret == 0)
2752 if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
2753 if (ret == 0 && errno != ENOENT)
2757 } else if (!only_dirs && !keep_around) {
2759 if (unlinkat(fd, de->d_name, 0) < 0) {
2760 if (ret == 0 && errno != ENOENT)
2771 static int is_temporary_fs(struct statfs *s) {
2773 return s->f_type == TMPFS_MAGIC ||
2774 (long)s->f_type == (long)RAMFS_MAGIC;
2777 int rm_rf_children(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) {
2782 if (fstatfs(fd, &s) < 0) {
2783 close_nointr_nofail(fd);
2787 /* We refuse to clean disk file systems with this call. This
2788 * is extra paranoia just to be sure we never ever remove
2790 if (!is_temporary_fs(&s)) {
2791 log_error("Attempted to remove disk file system, and we can't allow that.");
2792 close_nointr_nofail(fd);
2796 return rm_rf_children_dangerous(fd, only_dirs, honour_sticky, root_dev);
2799 static int rm_rf_internal(const char *path, bool only_dirs, bool delete_root, bool honour_sticky, bool dangerous) {
2805 /* We refuse to clean the root file system with this
2806 * call. This is extra paranoia to never cause a really
2807 * seriously broken system. */
2808 if (path_equal(path, "/")) {
2809 log_error("Attempted to remove entire root file system, and we can't allow that.");
2813 fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
2816 if (errno != ENOTDIR)
2820 if (statfs(path, &s) < 0)
2823 if (!is_temporary_fs(&s)) {
2824 log_error("Attempted to remove disk file system, and we can't allow that.");
2829 if (delete_root && !only_dirs)
2830 if (unlink(path) < 0 && errno != ENOENT)
2837 if (fstatfs(fd, &s) < 0) {
2838 close_nointr_nofail(fd);
2842 if (!is_temporary_fs(&s)) {
2843 log_error("Attempted to remove disk file system, and we can't allow that.");
2844 close_nointr_nofail(fd);
2849 r = rm_rf_children_dangerous(fd, only_dirs, honour_sticky, NULL);
2852 if (honour_sticky && file_is_priv_sticky(path) > 0)
2855 if (rmdir(path) < 0 && errno != ENOENT) {
2864 int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
2865 return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, false);
2868 int rm_rf_dangerous(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
2869 return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, true);
2872 int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
2875 /* Under the assumption that we are running privileged we
2876 * first change the access mode and only then hand out
2877 * ownership to avoid a window where access is too open. */
2879 if (mode != (mode_t) -1)
2880 if (chmod(path, mode) < 0)
2883 if (uid != (uid_t) -1 || gid != (gid_t) -1)
2884 if (chown(path, uid, gid) < 0)
2890 int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid) {
2893 /* Under the assumption that we are running privileged we
2894 * first change the access mode and only then hand out
2895 * ownership to avoid a window where access is too open. */
2897 if (fchmod(fd, mode) < 0)
2900 if (fchown(fd, uid, gid) < 0)
2906 cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
2910 /* Allocates the cpuset in the right size */
2913 if (!(r = CPU_ALLOC(n)))
2916 if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), r) >= 0) {
2917 CPU_ZERO_S(CPU_ALLOC_SIZE(n), r);
2927 if (errno != EINVAL)
2934 int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) {
2935 static const char status_indent[] = " "; /* "[" STATUS "] " */
2936 _cleanup_free_ char *s = NULL;
2937 _cleanup_close_ int fd = -1;
2938 struct iovec iovec[6] = {};
2940 static bool prev_ephemeral;
2944 /* This is independent of logging, as status messages are
2945 * optional and go exclusively to the console. */
2947 if (vasprintf(&s, format, ap) < 0)
2950 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
2963 sl = status ? sizeof(status_indent)-1 : 0;
2969 e = ellipsize(s, emax, 75);
2977 IOVEC_SET_STRING(iovec[n++], "\r" ANSI_ERASE_TO_END_OF_LINE);
2978 prev_ephemeral = ephemeral;
2981 if (!isempty(status)) {
2982 IOVEC_SET_STRING(iovec[n++], "[");
2983 IOVEC_SET_STRING(iovec[n++], status);
2984 IOVEC_SET_STRING(iovec[n++], "] ");
2986 IOVEC_SET_STRING(iovec[n++], status_indent);
2989 IOVEC_SET_STRING(iovec[n++], s);
2991 IOVEC_SET_STRING(iovec[n++], "\n");
2993 if (writev(fd, iovec, n) < 0)
2999 int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) {
3005 va_start(ap, format);
3006 r = status_vprintf(status, ellipse, ephemeral, format, ap);
3012 int status_welcome(void) {
3014 _cleanup_free_ char *pretty_name = NULL, *ansi_color = NULL;
3016 r = parse_env_file("/etc/os-release", NEWLINE,
3017 "PRETTY_NAME", &pretty_name,
3018 "ANSI_COLOR", &ansi_color,
3020 if (r < 0 && r != -ENOENT)
3021 log_warning("Failed to read /etc/os-release: %s", strerror(-r));
3023 return status_printf(NULL, false, false,
3024 "\nWelcome to \x1B[%sm%s\x1B[0m!\n",
3025 isempty(ansi_color) ? "1" : ansi_color,
3026 isempty(pretty_name) ? "Linux" : pretty_name);
3029 char *replace_env(const char *format, char **env) {
3036 const char *e, *word = format;
3041 for (e = format; *e; e ++) {
3052 if (!(k = strnappend(r, word, e-word-1)))
3061 } else if (*e == '$') {
3062 if (!(k = strnappend(r, word, e-word)))
3078 t = strempty(strv_env_get_n(env, word+2, e-word-2));
3080 k = strappend(r, t);
3094 if (!(k = strnappend(r, word, e-word)))
3105 char **replace_env_argv(char **argv, char **env) {
3107 unsigned k = 0, l = 0;
3109 l = strv_length(argv);
3111 if (!(r = new(char*, l+1)))
3114 STRV_FOREACH(i, argv) {
3116 /* If $FOO appears as single word, replace it by the split up variable */
3117 if ((*i)[0] == '$' && (*i)[1] != '{') {
3122 e = strv_env_get(env, *i+1);
3125 if (!(m = strv_split_quoted(e))) {
3136 if (!(w = realloc(r, sizeof(char*) * (l+1)))) {
3145 memcpy(r + k, m, q * sizeof(char*));
3153 /* If ${FOO} appears as part of a word, replace it by the variable as-is */
3154 if (!(r[k++] = replace_env(*i, env))) {
3164 int fd_columns(int fd) {
3165 struct winsize ws = {};
3167 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
3176 unsigned columns(void) {
3180 if (_likely_(cached_columns > 0))
3181 return cached_columns;
3184 e = getenv("COLUMNS");
3189 c = fd_columns(STDOUT_FILENO);
3198 int fd_lines(int fd) {
3199 struct winsize ws = {};
3201 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
3210 unsigned lines(void) {
3214 if (_likely_(cached_lines > 0))
3215 return cached_lines;
3218 e = getenv("LINES");
3223 l = fd_lines(STDOUT_FILENO);
3229 return cached_lines;
3232 /* intended to be used as a SIGWINCH sighandler */
3233 void columns_lines_cache_reset(int signum) {
3239 static int cached_on_tty = -1;
3241 if (_unlikely_(cached_on_tty < 0))
3242 cached_on_tty = isatty(STDOUT_FILENO) > 0;
3244 return cached_on_tty;
3247 int running_in_chroot(void) {
3248 struct stat a = {}, b = {};
3250 /* Only works as root */
3251 if (stat("/proc/1/root", &a) < 0)
3254 if (stat("/", &b) < 0)
3258 a.st_dev != b.st_dev ||
3259 a.st_ino != b.st_ino;
3262 char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
3267 assert(percent <= 100);
3268 assert(new_length >= 3);
3270 if (old_length <= 3 || old_length <= new_length)
3271 return strndup(s, old_length);
3273 r = new0(char, new_length+1);
3277 x = (new_length * percent) / 100;
3279 if (x > new_length - 3)
3287 s + old_length - (new_length - x - 3),
3288 new_length - x - 3);
3293 char *ellipsize(const char *s, size_t length, unsigned percent) {
3294 return ellipsize_mem(s, strlen(s), length, percent);
3297 int touch(const char *path) {
3302 /* This just opens the file for writing, ensuring it
3303 * exists. It doesn't call utimensat() the way /usr/bin/touch
3306 fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644);
3310 close_nointr_nofail(fd);
3314 char *unquote(const char *s, const char* quotes) {
3318 /* This is rather stupid, simply removes the heading and
3319 * trailing quotes if there is one. Doesn't care about
3320 * escaping or anything. We should make this smarter one
3327 if (strchr(quotes, s[0]) && s[l-1] == s[0])
3328 return strndup(s+1, l-2);
3333 char *normalize_env_assignment(const char *s) {
3334 _cleanup_free_ char *name = NULL, *value = NULL, *p = NULL;
3337 eq = strchr(s, '=');
3349 memmove(r, t, strlen(t) + 1);
3353 name = strndup(s, eq - s);
3361 value = unquote(strstrip(p), QUOTES);
3365 if (asprintf(&r, "%s=%s", strstrip(name), value) < 0)
3371 int wait_for_terminate(pid_t pid, siginfo_t *status) {
3382 if (waitid(P_PID, pid, status, WEXITED) < 0) {