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 size_t page_size(void) {
84 static __thread size_t pgsz = 0;
87 if (_likely_(pgsz > 0))
90 r = sysconf(_SC_PAGESIZE);
97 bool streq_ptr(const char *a, const char *b) {
99 /* Like streq(), but tries to make sense of NULL pointers */
110 char* endswith(const char *s, const char *postfix) {
117 pl = strlen(postfix);
120 return (char*) s + sl;
125 if (memcmp(s + sl - pl, postfix, pl) != 0)
128 return (char*) s + sl - pl;
131 bool first_word(const char *s, const char *word) {
146 if (memcmp(s, word, wl) != 0)
150 strchr(WHITESPACE, s[wl]);
153 int close_nointr(int fd) {
159 /* Just ignore EINTR; a retry loop is the wrong
160 * thing to do on Linux.
162 * http://lkml.indiana.edu/hypermail/linux/kernel/0509.1/0877.html
163 * https://bugzilla.gnome.org/show_bug.cgi?id=682819
164 * http://utcc.utoronto.ca/~cks/space/blog/unix/CloseEINTR
165 * https://sites.google.com/site/michaelsafyan/software-engineering/checkforeintrwheninvokingclosethinkagain
167 if (_unlikely_(r < 0 && errno == EINTR))
175 void close_nointr_nofail(int fd) {
178 /* like close_nointr() but cannot fail, and guarantees errno
181 assert_se(close_nointr(fd) == 0);
184 void close_many(const int fds[], unsigned n_fd) {
187 assert(fds || n_fd <= 0);
189 for (i = 0; i < n_fd; i++)
190 close_nointr_nofail(fds[i]);
193 int unlink_noerrno(const char *path) {
204 int parse_boolean(const char *v) {
207 if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || strcaseeq(v, "on"))
209 else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || strcaseeq(v, "off"))
215 int parse_pid(const char *s, pid_t* ret_pid) {
216 unsigned long ul = 0;
223 r = safe_atolu(s, &ul);
229 if ((unsigned long) pid != ul)
239 int parse_uid(const char *s, uid_t* ret_uid) {
240 unsigned long ul = 0;
247 r = safe_atolu(s, &ul);
253 if ((unsigned long) uid != ul)
260 int safe_atou(const char *s, unsigned *ret_u) {
268 l = strtoul(s, &x, 0);
270 if (!x || x == s || *x || errno)
271 return errno > 0 ? -errno : -EINVAL;
273 if ((unsigned long) (unsigned) l != l)
276 *ret_u = (unsigned) l;
280 int safe_atoi(const char *s, int *ret_i) {
288 l = strtol(s, &x, 0);
290 if (!x || x == s || *x || errno)
291 return errno > 0 ? -errno : -EINVAL;
293 if ((long) (int) l != l)
300 int safe_atollu(const char *s, long long unsigned *ret_llu) {
302 unsigned long long l;
308 l = strtoull(s, &x, 0);
310 if (!x || x == s || *x || errno)
311 return errno ? -errno : -EINVAL;
317 int safe_atolli(const char *s, long long int *ret_lli) {
325 l = strtoll(s, &x, 0);
327 if (!x || x == s || *x || errno)
328 return errno ? -errno : -EINVAL;
334 int safe_atod(const char *s, double *ret_d) {
341 RUN_WITH_LOCALE(LC_NUMERIC_MASK, "C") {
346 if (!x || x == s || *x || errno)
347 return errno ? -errno : -EINVAL;
353 /* Split a string into words. */
354 char *split(const char *c, size_t *l, const char *separator, char **state) {
357 current = *state ? *state : (char*) c;
359 if (!*current || *c == 0)
362 current += strspn(current, separator);
363 *l = strcspn(current, separator);
366 return (char*) current;
369 /* Split a string into words, but consider strings enclosed in '' and
370 * "" as words even if they include spaces. */
371 char *split_quoted(const char *c, size_t *l, char **state) {
373 bool escaped = false;
375 current = *state ? *state : (char*) c;
377 if (!*current || *c == 0)
380 current += strspn(current, WHITESPACE);
382 if (*current == '\'') {
385 for (e = current; *e; e++) {
395 *state = *e == 0 ? e : e+1;
396 } else if (*current == '\"') {
399 for (e = current; *e; e++) {
409 *state = *e == 0 ? e : e+1;
411 for (e = current; *e; e++) {
416 else if (strchr(WHITESPACE, *e))
423 return (char*) current;
426 int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
428 _cleanup_fclose_ FILE *f = NULL;
441 p = procfs_file_alloca(pid, "stat");
446 if (!fgets(line, sizeof(line), f)) {
447 r = feof(f) ? -EIO : -errno;
451 /* Let's skip the pid and comm fields. The latter is enclosed
452 * in () but does not escape any () in its value, so let's
453 * skip over it manually */
455 p = strrchr(line, ')');
467 if ((long unsigned) (pid_t) ppid != ppid)
470 *_ppid = (pid_t) ppid;
475 int get_starttime_of_pid(pid_t pid, unsigned long long *st) {
476 _cleanup_fclose_ FILE *f = NULL;
484 p = "/proc/self/stat";
486 p = procfs_file_alloca(pid, "stat");
492 if (!fgets(line, sizeof(line), f)) {
499 /* Let's skip the pid and comm fields. The latter is enclosed
500 * in () but does not escape any () in its value, so let's
501 * skip over it manually */
503 p = strrchr(line, ')');
525 "%*d " /* priority */
527 "%*d " /* num_threads */
528 "%*d " /* itrealvalue */
529 "%llu " /* starttime */,
536 int fchmod_umask(int fd, mode_t m) {
541 r = fchmod(fd, m & (~u)) < 0 ? -errno : 0;
547 char *truncate_nl(char *s) {
550 s[strcspn(s, NEWLINE)] = 0;
554 int get_process_comm(pid_t pid, char **name) {
561 p = "/proc/self/comm";
563 p = procfs_file_alloca(pid, "comm");
565 return read_one_line_file(p, name);
568 int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) {
569 _cleanup_fclose_ FILE *f = NULL;
578 p = "/proc/self/cmdline";
580 p = procfs_file_alloca(pid, "cmdline");
586 if (max_length == 0) {
587 size_t len = 0, allocated = 0;
589 while ((c = getc(f)) != EOF) {
591 if (!GREEDY_REALLOC(r, allocated, len+2)) {
596 r[len++] = isprint(c) ? c : ' ';
606 r = new(char, max_length);
612 while ((c = getc(f)) != EOF) {
634 size_t n = MIN(left-1, 3U);
641 /* Kernel threads have no argv[] */
642 if (r == NULL || r[0] == 0) {
651 h = get_process_comm(pid, &t);
655 r = strjoin("[", t, "]", NULL);
666 int is_kernel_thread(pid_t pid) {
678 p = procfs_file_alloca(pid, "cmdline");
683 count = fread(&c, 1, 1, f);
687 /* Kernel threads have an empty cmdline */
690 return eof ? 1 : -errno;
695 int get_process_capeff(pid_t pid, char **capeff) {
697 _cleanup_free_ char *status = NULL;
705 p = "/proc/self/status";
707 p = procfs_file_alloca(pid, "status");
709 r = read_full_file(p, &status, NULL);
713 t = strstr(status, "\nCapEff:\t");
717 for (t += strlen("\nCapEff:\t"); t[0] == '0'; t++)
723 *capeff = strndup(t, strchr(t, '\n') - t);
730 int get_process_exe(pid_t pid, char **name) {
739 p = "/proc/self/exe";
741 p = procfs_file_alloca(pid, "exe");
743 r = readlink_malloc(p, name);
747 d = endswith(*name, " (deleted)");
754 static int get_process_id(pid_t pid, const char *field, uid_t *uid) {
755 _cleanup_fclose_ FILE *f = NULL;
765 p = procfs_file_alloca(pid, "status");
770 FOREACH_LINE(line, f, return -errno) {
775 if (startswith(l, field)) {
777 l += strspn(l, WHITESPACE);
779 l[strcspn(l, WHITESPACE)] = 0;
781 return parse_uid(l, uid);
788 int get_process_uid(pid_t pid, uid_t *uid) {
789 return get_process_id(pid, "Uid:", uid);
792 int get_process_gid(pid_t pid, gid_t *gid) {
793 assert_cc(sizeof(uid_t) == sizeof(gid_t));
794 return get_process_id(pid, "Gid:", gid);
797 char *strnappend(const char *s, const char *suffix, size_t b) {
805 return strndup(suffix, b);
814 if (b > ((size_t) -1) - a)
817 r = new(char, a+b+1);
822 memcpy(r+a, suffix, b);
828 char *strappend(const char *s, const char *suffix) {
829 return strnappend(s, suffix, suffix ? strlen(suffix) : 0);
832 int readlink_malloc(const char *p, char **r) {
842 if (!(c = new(char, l)))
845 if ((n = readlink(p, c, l-1)) < 0) {
851 if ((size_t) n < l-1) {
862 int readlink_and_make_absolute(const char *p, char **r) {
863 _cleanup_free_ char *target = NULL;
870 j = readlink_malloc(p, &target);
874 k = file_in_same_dir(p, target);
882 int readlink_and_canonicalize(const char *p, char **r) {
889 j = readlink_and_make_absolute(p, &t);
893 s = canonicalize_file_name(t);
900 path_kill_slashes(*r);
905 int reset_all_signal_handlers(void) {
908 for (sig = 1; sig < _NSIG; sig++) {
909 struct sigaction sa = {
910 .sa_handler = SIG_DFL,
911 .sa_flags = SA_RESTART,
914 if (sig == SIGKILL || sig == SIGSTOP)
917 /* On Linux the first two RT signals are reserved by
918 * glibc, and sigaction() will return EINVAL for them. */
919 if ((sigaction(sig, &sa, NULL) < 0))
927 char *strstrip(char *s) {
930 /* Drops trailing whitespace. Modifies the string in
931 * place. Returns pointer to first non-space character */
933 s += strspn(s, WHITESPACE);
935 for (e = strchr(s, 0); e > s; e --)
936 if (!strchr(WHITESPACE, e[-1]))
944 char *delete_chars(char *s, const char *bad) {
947 /* Drops all whitespace, regardless where in the string */
949 for (f = s, t = s; *f; f++) {
961 bool in_charset(const char *s, const char* charset) {
968 if (!strchr(charset, *i))
974 char *file_in_same_dir(const char *path, const char *filename) {
981 /* This removes the last component of path and appends
982 * filename, unless the latter is absolute anyway or the
985 if (path_is_absolute(filename))
986 return strdup(filename);
988 if (!(e = strrchr(path, '/')))
989 return strdup(filename);
991 k = strlen(filename);
992 if (!(r = new(char, e-path+1+k+1)))
995 memcpy(r, path, e-path+1);
996 memcpy(r+(e-path)+1, filename, k+1);
1001 int rmdir_parents(const char *path, const char *stop) {
1010 /* Skip trailing slashes */
1011 while (l > 0 && path[l-1] == '/')
1017 /* Skip last component */
1018 while (l > 0 && path[l-1] != '/')
1021 /* Skip trailing slashes */
1022 while (l > 0 && path[l-1] == '/')
1028 if (!(t = strndup(path, l)))
1031 if (path_startswith(stop, t)) {
1040 if (errno != ENOENT)
1047 char hexchar(int x) {
1048 static const char table[16] = "0123456789abcdef";
1050 return table[x & 15];
1053 int unhexchar(char c) {
1055 if (c >= '0' && c <= '9')
1058 if (c >= 'a' && c <= 'f')
1059 return c - 'a' + 10;
1061 if (c >= 'A' && c <= 'F')
1062 return c - 'A' + 10;
1067 char *hexmem(const void *p, size_t l) {
1071 z = r = malloc(l * 2 + 1);
1075 for (x = p; x < (const uint8_t*) p + l; x++) {
1076 *(z++) = hexchar(*x >> 4);
1077 *(z++) = hexchar(*x & 15);
1084 void *unhexmem(const char *p, size_t l) {
1090 z = r = malloc((l + 1) / 2 + 1);
1094 for (x = p; x < p + l; x += 2) {
1097 a = unhexchar(x[0]);
1099 b = unhexchar(x[1]);
1103 *(z++) = (uint8_t) a << 4 | (uint8_t) b;
1110 char octchar(int x) {
1111 return '0' + (x & 7);
1114 int unoctchar(char c) {
1116 if (c >= '0' && c <= '7')
1122 char decchar(int x) {
1123 return '0' + (x % 10);
1126 int undecchar(char c) {
1128 if (c >= '0' && c <= '9')
1134 char *cescape(const char *s) {
1140 /* Does C style string escaping. */
1142 r = new(char, strlen(s)*4 + 1);
1146 for (f = s, t = r; *f; f++)
1192 /* For special chars we prefer octal over
1193 * hexadecimal encoding, simply because glib's
1194 * g_strescape() does the same */
1195 if ((*f < ' ') || (*f >= 127)) {
1197 *(t++) = octchar((unsigned char) *f >> 6);
1198 *(t++) = octchar((unsigned char) *f >> 3);
1199 *(t++) = octchar((unsigned char) *f);
1210 char *cunescape_length_with_prefix(const char *s, size_t length, const char *prefix) {
1217 /* Undoes C style string escaping, and optionally prefixes it. */
1219 pl = prefix ? strlen(prefix) : 0;
1221 r = new(char, pl+length+1);
1226 memcpy(r, prefix, pl);
1228 for (f = s, t = r + pl; f < s + length; f++) {
1271 /* This is an extension of the XDG syntax files */
1276 /* hexadecimal encoding */
1279 a = unhexchar(f[1]);
1280 b = unhexchar(f[2]);
1282 if (a < 0 || b < 0) {
1283 /* Invalid escape code, let's take it literal then */
1287 *(t++) = (char) ((a << 4) | b);
1302 /* octal encoding */
1305 a = unoctchar(f[0]);
1306 b = unoctchar(f[1]);
1307 c = unoctchar(f[2]);
1309 if (a < 0 || b < 0 || c < 0) {
1310 /* Invalid escape code, let's take it literal then */
1314 *(t++) = (char) ((a << 6) | (b << 3) | c);
1322 /* premature end of string.*/
1327 /* Invalid escape code, let's take it literal then */
1339 char *cunescape_length(const char *s, size_t length) {
1340 return cunescape_length_with_prefix(s, length, NULL);
1343 char *cunescape(const char *s) {
1346 return cunescape_length(s, strlen(s));
1349 char *xescape(const char *s, const char *bad) {
1353 /* Escapes all chars in bad, in addition to \ and all special
1354 * chars, in \xFF style escaping. May be reversed with
1357 r = new(char, strlen(s) * 4 + 1);
1361 for (f = s, t = r; *f; f++) {
1363 if ((*f < ' ') || (*f >= 127) ||
1364 (*f == '\\') || strchr(bad, *f)) {
1367 *(t++) = hexchar(*f >> 4);
1368 *(t++) = hexchar(*f);
1378 char *bus_path_escape(const char *s) {
1384 /* Escapes all chars that D-Bus' object path cannot deal
1385 * with. Can be reverse with bus_path_unescape(). We special
1386 * case the empty string. */
1391 r = new(char, strlen(s)*3 + 1);
1395 for (f = s, t = r; *f; f++) {
1397 /* Escape everything that is not a-zA-Z0-9. We also
1398 * escape 0-9 if it's the first character */
1400 if (!(*f >= 'A' && *f <= 'Z') &&
1401 !(*f >= 'a' && *f <= 'z') &&
1402 !(f > s && *f >= '0' && *f <= '9')) {
1404 *(t++) = hexchar(*f >> 4);
1405 *(t++) = hexchar(*f);
1415 char *bus_path_unescape(const char *f) {
1420 /* Special case for the empty string */
1424 r = new(char, strlen(f) + 1);
1428 for (t = r; *f; f++) {
1433 if ((a = unhexchar(f[1])) < 0 ||
1434 (b = unhexchar(f[2])) < 0) {
1435 /* Invalid escape code, let's take it literal then */
1438 *(t++) = (char) ((a << 4) | b);
1450 char *ascii_strlower(char *t) {
1455 for (p = t; *p; p++)
1456 if (*p >= 'A' && *p <= 'Z')
1457 *p = *p - 'A' + 'a';
1462 _pure_ static bool ignore_file_allow_backup(const char *filename) {
1466 filename[0] == '.' ||
1467 streq(filename, "lost+found") ||
1468 streq(filename, "aquota.user") ||
1469 streq(filename, "aquota.group") ||
1470 endswith(filename, ".rpmnew") ||
1471 endswith(filename, ".rpmsave") ||
1472 endswith(filename, ".rpmorig") ||
1473 endswith(filename, ".dpkg-old") ||
1474 endswith(filename, ".dpkg-new") ||
1475 endswith(filename, ".swp");
1478 bool ignore_file(const char *filename) {
1481 if (endswith(filename, "~"))
1484 return ignore_file_allow_backup(filename);
1487 int fd_nonblock(int fd, bool nonblock) {
1492 if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
1496 flags |= O_NONBLOCK;
1498 flags &= ~O_NONBLOCK;
1500 if (fcntl(fd, F_SETFL, flags) < 0)
1506 int fd_cloexec(int fd, bool cloexec) {
1511 if ((flags = fcntl(fd, F_GETFD, 0)) < 0)
1515 flags |= FD_CLOEXEC;
1517 flags &= ~FD_CLOEXEC;
1519 if (fcntl(fd, F_SETFD, flags) < 0)
1525 _pure_ static bool fd_in_set(int fd, const int fdset[], unsigned n_fdset) {
1528 assert(n_fdset == 0 || fdset);
1530 for (i = 0; i < n_fdset; i++)
1537 int close_all_fds(const int except[], unsigned n_except) {
1542 assert(n_except == 0 || except);
1544 d = opendir("/proc/self/fd");
1549 /* When /proc isn't available (for example in chroots)
1550 * the fallback is brute forcing through the fd
1553 assert_se(getrlimit(RLIMIT_NOFILE, &rl) >= 0);
1554 for (fd = 3; fd < (int) rl.rlim_max; fd ++) {
1556 if (fd_in_set(fd, except, n_except))
1559 if (close_nointr(fd) < 0)
1560 if (errno != EBADF && r == 0)
1567 while ((de = readdir(d))) {
1570 if (ignore_file(de->d_name))
1573 if (safe_atoi(de->d_name, &fd) < 0)
1574 /* Let's better ignore this, just in case */
1583 if (fd_in_set(fd, except, n_except))
1586 if (close_nointr(fd) < 0) {
1587 /* Valgrind has its own FD and doesn't want to have it closed */
1588 if (errno != EBADF && r == 0)
1597 bool chars_intersect(const char *a, const char *b) {
1600 /* Returns true if any of the chars in a are in b. */
1601 for (p = a; *p; p++)
1608 bool fstype_is_network(const char *fstype) {
1609 static const char table[] =
1619 return nulstr_contains(table, fstype);
1623 _cleanup_close_ int fd;
1625 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
1631 TIOCL_GETKMSGREDIRECT,
1635 if (ioctl(fd, TIOCLINUX, tiocl) < 0)
1638 vt = tiocl[0] <= 0 ? 1 : tiocl[0];
1641 if (ioctl(fd, VT_ACTIVATE, vt) < 0)
1647 int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
1648 struct termios old_termios, new_termios;
1650 char line[LINE_MAX];
1655 if (tcgetattr(fileno(f), &old_termios) >= 0) {
1656 new_termios = old_termios;
1658 new_termios.c_lflag &= ~ICANON;
1659 new_termios.c_cc[VMIN] = 1;
1660 new_termios.c_cc[VTIME] = 0;
1662 if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
1665 if (t != (usec_t) -1) {
1666 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) {
1667 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
1672 k = fread(&c, 1, 1, f);
1674 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
1680 *need_nl = c != '\n';
1687 if (t != (usec_t) -1)
1688 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0)
1691 if (!fgets(line, sizeof(line), f))
1696 if (strlen(line) != 1)
1706 int ask(char *ret, const char *replies, const char *text, ...) {
1716 bool need_nl = true;
1719 fputs(ANSI_HIGHLIGHT_ON, stdout);
1726 fputs(ANSI_HIGHLIGHT_OFF, stdout);
1730 r = read_one_char(stdin, &c, (usec_t) -1, &need_nl);
1733 if (r == -EBADMSG) {
1734 puts("Bad input, please try again.");
1745 if (strchr(replies, c)) {
1750 puts("Read unexpected character, please try again.");
1754 int reset_terminal_fd(int fd, bool switch_to_text) {
1755 struct termios termios;
1758 /* Set terminal to some sane defaults */
1762 /* We leave locked terminal attributes untouched, so that
1763 * Plymouth may set whatever it wants to set, and we don't
1764 * interfere with that. */
1766 /* Disable exclusive mode, just in case */
1767 ioctl(fd, TIOCNXCL);
1769 /* Switch to text mode */
1771 ioctl(fd, KDSETMODE, KD_TEXT);
1773 /* Enable console unicode mode */
1774 ioctl(fd, KDSKBMODE, K_UNICODE);
1776 if (tcgetattr(fd, &termios) < 0) {
1781 /* We only reset the stuff that matters to the software. How
1782 * hardware is set up we don't touch assuming that somebody
1783 * else will do that for us */
1785 termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
1786 termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
1787 termios.c_oflag |= ONLCR;
1788 termios.c_cflag |= CREAD;
1789 termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
1791 termios.c_cc[VINTR] = 03; /* ^C */
1792 termios.c_cc[VQUIT] = 034; /* ^\ */
1793 termios.c_cc[VERASE] = 0177;
1794 termios.c_cc[VKILL] = 025; /* ^X */
1795 termios.c_cc[VEOF] = 04; /* ^D */
1796 termios.c_cc[VSTART] = 021; /* ^Q */
1797 termios.c_cc[VSTOP] = 023; /* ^S */
1798 termios.c_cc[VSUSP] = 032; /* ^Z */
1799 termios.c_cc[VLNEXT] = 026; /* ^V */
1800 termios.c_cc[VWERASE] = 027; /* ^W */
1801 termios.c_cc[VREPRINT] = 022; /* ^R */
1802 termios.c_cc[VEOL] = 0;
1803 termios.c_cc[VEOL2] = 0;
1805 termios.c_cc[VTIME] = 0;
1806 termios.c_cc[VMIN] = 1;
1808 if (tcsetattr(fd, TCSANOW, &termios) < 0)
1812 /* Just in case, flush all crap out */
1813 tcflush(fd, TCIOFLUSH);
1818 int reset_terminal(const char *name) {
1821 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
1825 r = reset_terminal_fd(fd, true);
1826 close_nointr_nofail(fd);
1831 int open_terminal(const char *name, int mode) {
1836 * If a TTY is in the process of being closed opening it might
1837 * cause EIO. This is horribly awful, but unlikely to be
1838 * changed in the kernel. Hence we work around this problem by
1839 * retrying a couple of times.
1841 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
1844 assert(!(mode & O_CREAT));
1847 fd = open(name, mode, 0);
1854 /* Max 1s in total */
1858 usleep(50 * USEC_PER_MSEC);
1867 close_nointr_nofail(fd);
1872 close_nointr_nofail(fd);
1879 int flush_fd(int fd) {
1880 struct pollfd pollfd = {
1890 r = poll(&pollfd, 1, 0);
1900 l = read(fd, buf, sizeof(buf));
1906 if (errno == EAGAIN)
1915 int acquire_terminal(
1919 bool ignore_tiocstty_eperm,
1922 int fd = -1, notify = -1, r = 0, wd = -1;
1927 /* We use inotify to be notified when the tty is closed. We
1928 * create the watch before checking if we can actually acquire
1929 * it, so that we don't lose any event.
1931 * Note: strictly speaking this actually watches for the
1932 * device being closed, it does *not* really watch whether a
1933 * tty loses its controlling process. However, unless some
1934 * rogue process uses TIOCNOTTY on /dev/tty *after* closing
1935 * its tty otherwise this will not become a problem. As long
1936 * as the administrator makes sure not configure any service
1937 * on the same tty as an untrusted user this should not be a
1938 * problem. (Which he probably should not do anyway.) */
1940 if (timeout != (usec_t) -1)
1941 ts = now(CLOCK_MONOTONIC);
1943 if (!fail && !force) {
1944 notify = inotify_init1(IN_CLOEXEC | (timeout != (usec_t) -1 ? IN_NONBLOCK : 0));
1950 wd = inotify_add_watch(notify, name, IN_CLOSE);
1958 struct sigaction sa_old, sa_new = {
1959 .sa_handler = SIG_IGN,
1960 .sa_flags = SA_RESTART,
1964 r = flush_fd(notify);
1969 /* We pass here O_NOCTTY only so that we can check the return
1970 * value TIOCSCTTY and have a reliable way to figure out if we
1971 * successfully became the controlling process of the tty */
1972 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
1976 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
1977 * if we already own the tty. */
1978 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
1980 /* First, try to get the tty */
1981 if (ioctl(fd, TIOCSCTTY, force) < 0)
1984 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
1986 /* Sometimes it makes sense to ignore TIOCSCTTY
1987 * returning EPERM, i.e. when very likely we already
1988 * are have this controlling terminal. */
1989 if (r < 0 && r == -EPERM && ignore_tiocstty_eperm)
1992 if (r < 0 && (force || fail || r != -EPERM)) {
2001 assert(notify >= 0);
2004 uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
2006 struct inotify_event *e;
2008 if (timeout != (usec_t) -1) {
2011 n = now(CLOCK_MONOTONIC);
2012 if (ts + timeout < n) {
2017 r = fd_wait_for_event(fd, POLLIN, ts + timeout - n);
2027 l = read(notify, inotify_buffer, sizeof(inotify_buffer));
2030 if (errno == EINTR || errno == EAGAIN)
2037 e = (struct inotify_event*) inotify_buffer;
2042 if (e->wd != wd || !(e->mask & IN_CLOSE)) {
2047 step = sizeof(struct inotify_event) + e->len;
2048 assert(step <= (size_t) l);
2050 e = (struct inotify_event*) ((uint8_t*) e + step);
2057 /* We close the tty fd here since if the old session
2058 * ended our handle will be dead. It's important that
2059 * we do this after sleeping, so that we don't enter
2060 * an endless loop. */
2061 close_nointr_nofail(fd);
2065 close_nointr_nofail(notify);
2067 r = reset_terminal_fd(fd, true);
2069 log_warning("Failed to reset terminal: %s", strerror(-r));
2075 close_nointr_nofail(fd);
2078 close_nointr_nofail(notify);
2083 int release_terminal(void) {
2085 struct sigaction sa_old, sa_new = {
2086 .sa_handler = SIG_IGN,
2087 .sa_flags = SA_RESTART,
2089 _cleanup_close_ int fd;
2091 fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC);
2095 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
2096 * by our own TIOCNOTTY */
2097 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
2099 if (ioctl(fd, TIOCNOTTY) < 0)
2102 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
2107 int sigaction_many(const struct sigaction *sa, ...) {
2112 while ((sig = va_arg(ap, int)) > 0)
2113 if (sigaction(sig, sa, NULL) < 0)
2120 int ignore_signals(int sig, ...) {
2121 struct sigaction sa = {
2122 .sa_handler = SIG_IGN,
2123 .sa_flags = SA_RESTART,
2129 if (sigaction(sig, &sa, NULL) < 0)
2133 while ((sig = va_arg(ap, int)) > 0)
2134 if (sigaction(sig, &sa, NULL) < 0)
2141 int default_signals(int sig, ...) {
2142 struct sigaction sa = {
2143 .sa_handler = SIG_DFL,
2144 .sa_flags = SA_RESTART,
2149 if (sigaction(sig, &sa, NULL) < 0)
2153 while ((sig = va_arg(ap, int)) > 0)
2154 if (sigaction(sig, &sa, NULL) < 0)
2161 int close_pipe(int p[]) {
2167 a = close_nointr(p[0]);
2172 b = close_nointr(p[1]);
2176 return a < 0 ? a : b;
2179 ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) {
2188 while (nbytes > 0) {
2191 if ((k = read(fd, p, nbytes)) <= 0) {
2193 if (k < 0 && errno == EINTR)
2196 if (k < 0 && errno == EAGAIN && do_poll) {
2197 struct pollfd pollfd = {
2202 if (poll(&pollfd, 1, -1) < 0) {
2206 return n > 0 ? n : -errno;
2209 if (pollfd.revents != POLLIN)
2210 return n > 0 ? n : -EIO;
2215 return n > 0 ? n : (k < 0 ? -errno : 0);
2226 ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) {
2235 while (nbytes > 0) {
2238 k = write(fd, p, nbytes);
2241 if (k < 0 && errno == EINTR)
2244 if (k < 0 && errno == EAGAIN && do_poll) {
2245 struct pollfd pollfd = {
2250 if (poll(&pollfd, 1, -1) < 0) {
2254 return n > 0 ? n : -errno;
2257 if (pollfd.revents != POLLOUT)
2258 return n > 0 ? n : -EIO;
2263 return n > 0 ? n : (k < 0 ? -errno : 0);
2274 int parse_bytes(const char *t, off_t *bytes) {
2275 static const struct {
2277 unsigned long long factor;
2281 { "M", 1024ULL*1024ULL },
2282 { "G", 1024ULL*1024ULL*1024ULL },
2283 { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
2284 { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
2285 { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
2290 unsigned long long r = 0;
2302 l = strtoll(p, &e, 10);
2313 e += strspn(e, WHITESPACE);
2315 for (i = 0; i < ELEMENTSOF(table); i++)
2316 if (startswith(e, table[i].suffix)) {
2317 unsigned long long tmp;
2318 if ((unsigned long long) l > ULLONG_MAX / table[i].factor)
2320 tmp = l * table[i].factor;
2321 if (tmp > ULLONG_MAX - r)
2325 if ((unsigned long long) (off_t) r != r)
2328 p = e + strlen(table[i].suffix);
2332 if (i >= ELEMENTSOF(table))
2342 int make_stdio(int fd) {
2347 r = dup3(fd, STDIN_FILENO, 0);
2348 s = dup3(fd, STDOUT_FILENO, 0);
2349 t = dup3(fd, STDERR_FILENO, 0);
2352 close_nointr_nofail(fd);
2354 if (r < 0 || s < 0 || t < 0)
2357 /* We rely here that the new fd has O_CLOEXEC not set */
2362 int make_null_stdio(void) {
2365 null_fd = open("/dev/null", O_RDWR|O_NOCTTY);
2369 return make_stdio(null_fd);
2372 bool is_device_path(const char *path) {
2374 /* Returns true on paths that refer to a device, either in
2375 * sysfs or in /dev */
2378 path_startswith(path, "/dev/") ||
2379 path_startswith(path, "/sys/");
2382 int dir_is_empty(const char *path) {
2383 _cleanup_closedir_ DIR *d;
2392 union dirent_storage buf;
2394 r = readdir_r(d, &buf.de, &de);
2401 if (!ignore_file(de->d_name))
2406 char* dirname_malloc(const char *path) {
2407 char *d, *dir, *dir2;
2424 unsigned long long random_ull(void) {
2425 _cleanup_close_ int fd;
2429 fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY);
2433 r = loop_read(fd, &ull, sizeof(ull), true);
2434 if (r != sizeof(ull))
2440 return random() * RAND_MAX + random();
2443 void rename_process(const char name[8]) {
2446 /* This is a like a poor man's setproctitle(). It changes the
2447 * comm field, argv[0], and also the glibc's internally used
2448 * name of the process. For the first one a limit of 16 chars
2449 * applies, to the second one usually one of 10 (i.e. length
2450 * of "/sbin/init"), to the third one one of 7 (i.e. length of
2451 * "systemd"). If you pass a longer string it will be
2454 prctl(PR_SET_NAME, name);
2456 if (program_invocation_name)
2457 strncpy(program_invocation_name, name, strlen(program_invocation_name));
2459 if (saved_argc > 0) {
2463 strncpy(saved_argv[0], name, strlen(saved_argv[0]));
2465 for (i = 1; i < saved_argc; i++) {
2469 memset(saved_argv[i], 0, strlen(saved_argv[i]));
2474 void sigset_add_many(sigset_t *ss, ...) {
2481 while ((sig = va_arg(ap, int)) > 0)
2482 assert_se(sigaddset(ss, sig) == 0);
2486 char* gethostname_malloc(void) {
2489 assert_se(uname(&u) >= 0);
2491 if (!isempty(u.nodename) && !streq(u.nodename, "(none)"))
2492 return strdup(u.nodename);
2494 return strdup(u.sysname);
2497 bool hostname_is_set(void) {
2500 assert_se(uname(&u) >= 0);
2502 return !isempty(u.nodename) && !streq(u.nodename, "(none)");
2505 static char *lookup_uid(uid_t uid) {
2508 _cleanup_free_ char *buf = NULL;
2509 struct passwd pwbuf, *pw = NULL;
2511 /* Shortcut things to avoid NSS lookups */
2513 return strdup("root");
2515 bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
2519 buf = malloc(bufsize);
2523 if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw)
2524 return strdup(pw->pw_name);
2526 if (asprintf(&name, "%lu", (unsigned long) uid) < 0)
2532 char* getlogname_malloc(void) {
2536 if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0)
2541 return lookup_uid(uid);
2544 char *getusername_malloc(void) {
2551 return lookup_uid(getuid());
2554 int getttyname_malloc(int fd, char **r) {
2555 char path[PATH_MAX], *c;
2560 k = ttyname_r(fd, path, sizeof(path));
2566 c = strdup(startswith(path, "/dev/") ? path + 5 : path);
2574 int getttyname_harder(int fd, char **r) {
2578 k = getttyname_malloc(fd, &s);
2582 if (streq(s, "tty")) {
2584 return get_ctty(0, NULL, r);
2591 int get_ctty_devnr(pid_t pid, dev_t *d) {
2592 _cleanup_fclose_ FILE *f = NULL;
2593 char line[LINE_MAX], *p;
2594 unsigned long ttynr;
2602 fn = "/proc/self/stat";
2604 fn = procfs_file_alloca(pid, "stat");
2606 f = fopen(fn, "re");
2610 if (!fgets(line, sizeof(line), f)) {
2611 k = feof(f) ? -EIO : -errno;
2615 p = strrchr(line, ')');
2625 "%*d " /* session */
2630 if (major(ttynr) == 0 && minor(ttynr) == 0)
2637 int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
2639 char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *s, *b, *p;
2644 k = get_ctty_devnr(pid, &devnr);
2648 snprintf(fn, sizeof(fn), "/dev/char/%u:%u", major(devnr), minor(devnr));
2650 k = readlink_malloc(fn, &s);
2656 /* This is an ugly hack */
2657 if (major(devnr) == 136) {
2658 if (asprintf(&b, "pts/%lu", (unsigned long) minor(devnr)) < 0)
2668 /* Probably something like the ptys which have no
2669 * symlink in /dev/char. Let's return something
2670 * vaguely useful. */
2683 if (startswith(s, "/dev/"))
2685 else if (startswith(s, "../"))
2703 int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) {
2709 /* This returns the first error we run into, but nevertheless
2710 * tries to go on. This closes the passed fd. */
2714 close_nointr_nofail(fd);
2716 return errno == ENOENT ? 0 : -errno;
2721 union dirent_storage buf;
2722 bool is_dir, keep_around;
2726 r = readdir_r(d, &buf.de, &de);
2727 if (r != 0 && ret == 0) {
2735 if (streq(de->d_name, ".") || streq(de->d_name, ".."))
2738 if (de->d_type == DT_UNKNOWN ||
2740 (de->d_type == DT_DIR && root_dev)) {
2741 if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
2742 if (ret == 0 && errno != ENOENT)
2747 is_dir = S_ISDIR(st.st_mode);
2750 (st.st_uid == 0 || st.st_uid == getuid()) &&
2751 (st.st_mode & S_ISVTX);
2753 is_dir = de->d_type == DT_DIR;
2754 keep_around = false;
2760 /* if root_dev is set, remove subdirectories only, if device is same as dir */
2761 if (root_dev && st.st_dev != root_dev->st_dev)
2764 subdir_fd = openat(fd, de->d_name,
2765 O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
2766 if (subdir_fd < 0) {
2767 if (ret == 0 && errno != ENOENT)
2772 r = rm_rf_children_dangerous(subdir_fd, only_dirs, honour_sticky, root_dev);
2773 if (r < 0 && ret == 0)
2777 if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
2778 if (ret == 0 && errno != ENOENT)
2782 } else if (!only_dirs && !keep_around) {
2784 if (unlinkat(fd, de->d_name, 0) < 0) {
2785 if (ret == 0 && errno != ENOENT)
2796 _pure_ static int is_temporary_fs(struct statfs *s) {
2799 F_TYPE_EQUAL(s->f_type, TMPFS_MAGIC) ||
2800 F_TYPE_EQUAL(s->f_type, RAMFS_MAGIC);
2803 int rm_rf_children(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) {
2808 if (fstatfs(fd, &s) < 0) {
2809 close_nointr_nofail(fd);
2813 /* We refuse to clean disk file systems with this call. This
2814 * is extra paranoia just to be sure we never ever remove
2816 if (!is_temporary_fs(&s)) {
2817 log_error("Attempted to remove disk file system, and we can't allow that.");
2818 close_nointr_nofail(fd);
2822 return rm_rf_children_dangerous(fd, only_dirs, honour_sticky, root_dev);
2825 static int rm_rf_internal(const char *path, bool only_dirs, bool delete_root, bool honour_sticky, bool dangerous) {
2831 /* We refuse to clean the root file system with this
2832 * call. This is extra paranoia to never cause a really
2833 * seriously broken system. */
2834 if (path_equal(path, "/")) {
2835 log_error("Attempted to remove entire root file system, and we can't allow that.");
2839 fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
2842 if (errno != ENOTDIR)
2846 if (statfs(path, &s) < 0)
2849 if (!is_temporary_fs(&s)) {
2850 log_error("Attempted to remove disk file system, and we can't allow that.");
2855 if (delete_root && !only_dirs)
2856 if (unlink(path) < 0 && errno != ENOENT)
2863 if (fstatfs(fd, &s) < 0) {
2864 close_nointr_nofail(fd);
2868 if (!is_temporary_fs(&s)) {
2869 log_error("Attempted to remove disk file system, and we can't allow that.");
2870 close_nointr_nofail(fd);
2875 r = rm_rf_children_dangerous(fd, only_dirs, honour_sticky, NULL);
2878 if (honour_sticky && file_is_priv_sticky(path) > 0)
2881 if (rmdir(path) < 0 && errno != ENOENT) {
2890 int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
2891 return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, false);
2894 int rm_rf_dangerous(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
2895 return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, true);
2898 int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
2901 /* Under the assumption that we are running privileged we
2902 * first change the access mode and only then hand out
2903 * ownership to avoid a window where access is too open. */
2905 if (mode != (mode_t) -1)
2906 if (chmod(path, mode) < 0)
2909 if (uid != (uid_t) -1 || gid != (gid_t) -1)
2910 if (chown(path, uid, gid) < 0)
2916 int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid) {
2919 /* Under the assumption that we are running privileged we
2920 * first change the access mode and only then hand out
2921 * ownership to avoid a window where access is too open. */
2923 if (fchmod(fd, mode) < 0)
2926 if (fchown(fd, uid, gid) < 0)
2932 cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
2936 /* Allocates the cpuset in the right size */
2939 if (!(r = CPU_ALLOC(n)))
2942 if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), r) >= 0) {
2943 CPU_ZERO_S(CPU_ALLOC_SIZE(n), r);
2953 if (errno != EINVAL)
2960 int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) {
2961 static const char status_indent[] = " "; /* "[" STATUS "] " */
2962 _cleanup_free_ char *s = NULL;
2963 _cleanup_close_ int fd = -1;
2964 struct iovec iovec[6] = {};
2966 static bool prev_ephemeral;
2970 /* This is independent of logging, as status messages are
2971 * optional and go exclusively to the console. */
2973 if (vasprintf(&s, format, ap) < 0)
2976 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
2989 sl = status ? sizeof(status_indent)-1 : 0;
2995 e = ellipsize(s, emax, 75);
3003 IOVEC_SET_STRING(iovec[n++], "\r" ANSI_ERASE_TO_END_OF_LINE);
3004 prev_ephemeral = ephemeral;
3007 if (!isempty(status)) {
3008 IOVEC_SET_STRING(iovec[n++], "[");
3009 IOVEC_SET_STRING(iovec[n++], status);
3010 IOVEC_SET_STRING(iovec[n++], "] ");
3012 IOVEC_SET_STRING(iovec[n++], status_indent);
3015 IOVEC_SET_STRING(iovec[n++], s);
3017 IOVEC_SET_STRING(iovec[n++], "\n");
3019 if (writev(fd, iovec, n) < 0)
3025 int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) {
3031 va_start(ap, format);
3032 r = status_vprintf(status, ellipse, ephemeral, format, ap);
3038 int status_welcome(void) {
3040 _cleanup_free_ char *pretty_name = NULL, *ansi_color = NULL;
3042 r = parse_env_file("/etc/os-release", NEWLINE,
3043 "PRETTY_NAME", &pretty_name,
3044 "ANSI_COLOR", &ansi_color,
3046 if (r < 0 && r != -ENOENT)
3047 log_warning("Failed to read /etc/os-release: %s", strerror(-r));
3049 return status_printf(NULL, false, false,
3050 "\nWelcome to \x1B[%sm%s\x1B[0m!\n",
3051 isempty(ansi_color) ? "1" : ansi_color,
3052 isempty(pretty_name) ? "Linux" : pretty_name);
3055 char *replace_env(const char *format, char **env) {
3062 const char *e, *word = format;
3067 for (e = format; *e; e ++) {
3078 if (!(k = strnappend(r, word, e-word-1)))
3087 } else if (*e == '$') {
3088 if (!(k = strnappend(r, word, e-word)))
3104 t = strempty(strv_env_get_n(env, word+2, e-word-2));
3106 k = strappend(r, t);
3120 if (!(k = strnappend(r, word, e-word)))
3131 char **replace_env_argv(char **argv, char **env) {
3133 unsigned k = 0, l = 0;
3135 l = strv_length(argv);
3137 if (!(r = new(char*, l+1)))
3140 STRV_FOREACH(i, argv) {
3142 /* If $FOO appears as single word, replace it by the split up variable */
3143 if ((*i)[0] == '$' && (*i)[1] != '{') {
3148 e = strv_env_get(env, *i+1);
3151 if (!(m = strv_split_quoted(e))) {
3162 if (!(w = realloc(r, sizeof(char*) * (l+1)))) {
3171 memcpy(r + k, m, q * sizeof(char*));
3179 /* If ${FOO} appears as part of a word, replace it by the variable as-is */
3180 if (!(r[k++] = replace_env(*i, env))) {
3190 int fd_columns(int fd) {
3191 struct winsize ws = {};
3193 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
3202 unsigned columns(void) {
3206 if (_likely_(cached_columns > 0))
3207 return cached_columns;
3210 e = getenv("COLUMNS");
3215 c = fd_columns(STDOUT_FILENO);
3224 int fd_lines(int fd) {
3225 struct winsize ws = {};
3227 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
3236 unsigned lines(void) {
3240 if (_likely_(cached_lines > 0))
3241 return cached_lines;
3244 e = getenv("LINES");
3249 l = fd_lines(STDOUT_FILENO);
3255 return cached_lines;
3258 /* intended to be used as a SIGWINCH sighandler */
3259 void columns_lines_cache_reset(int signum) {
3265 static int cached_on_tty = -1;
3267 if (_unlikely_(cached_on_tty < 0))
3268 cached_on_tty = isatty(STDOUT_FILENO) > 0;
3270 return cached_on_tty;
3273 int running_in_chroot(void) {
3274 struct stat a = {}, b = {};
3276 /* Only works as root */
3277 if (stat("/proc/1/root", &a) < 0)
3280 if (stat("/", &b) < 0)
3284 a.st_dev != b.st_dev ||
3285 a.st_ino != b.st_ino;
3288 char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
3293 assert(percent <= 100);
3294 assert(new_length >= 3);
3296 if (old_length <= 3 || old_length <= new_length)
3297 return strndup(s, old_length);
3299 r = new0(char, new_length+1);
3303 x = (new_length * percent) / 100;
3305 if (x > new_length - 3)
3313 s + old_length - (new_length - x - 3),
3314 new_length - x - 3);
3319 char *ellipsize(const char *s, size_t length, unsigned percent) {
3320 return ellipsize_mem(s, strlen(s), length, percent);
3323 int touch(const char *path) {
3328 /* This just opens the file for writing, ensuring it
3329 * exists. It doesn't call utimensat() the way /usr/bin/touch
3332 fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644);
3336 close_nointr_nofail(fd);
3340 char *unquote(const char *s, const char* quotes) {
3344 /* This is rather stupid, simply removes the heading and
3345 * trailing quotes if there is one. Doesn't care about
3346 * escaping or anything. We should make this smarter one
3353 if (strchr(quotes, s[0]) && s[l-1] == s[0])
3354 return strndup(s+1, l-2);
3359 char *normalize_env_assignment(const char *s) {
3360 _cleanup_free_ char *name = NULL, *value = NULL, *p = NULL;
3363 eq = strchr(s, '=');
3375 memmove(r, t, strlen(t) + 1);
3379 name = strndup(s, eq - s);
3387 value = unquote(strstrip(p), QUOTES);
3391 if (asprintf(&r, "%s=%s", strstrip(name), value) < 0)