1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2010 Lennart Poettering
11 //#include <linux/kd.h>
12 //#include <linux/tiocl.h>
13 //#include <linux/vt.h>
20 #include <sys/inotify.h>
21 //#include <sys/ioctl.h>
22 #include <sys/socket.h>
23 #include <sys/sysmacros.h>
25 #include <sys/types.h>
26 //#include <sys/utsname.h>
30 #include "alloc-util.h"
41 #include "parse-util.h"
42 //#include "path-util.h"
43 //#include "proc-cmdline.h"
44 #include "process-util.h"
45 #include "socket-util.h"
46 #include "stat-util.h"
47 #include "string-util.h"
49 #include "terminal-util.h"
50 #include "time-util.h"
53 /// Additional includes needed by elogind
54 #include "path-util.h"
56 static volatile unsigned cached_columns = 0;
57 static volatile unsigned cached_lines = 0;
59 static volatile int cached_on_tty = -1;
60 static volatile int cached_colors_enabled = -1;
61 static volatile int cached_underline_enabled = -1;
64 _cleanup_close_ int fd;
66 /* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go,
67 * if that's configured. */
69 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
75 TIOCL_GETKMSGREDIRECT,
79 if (ioctl(fd, TIOCLINUX, tiocl) < 0)
82 vt = tiocl[0] <= 0 ? 1 : tiocl[0];
85 if (ioctl(fd, VT_ACTIVATE, vt) < 0)
91 #if 0 /// UNNEEDED by elogind
92 int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
93 struct termios old_termios, new_termios;
94 char c, line[LINE_MAX];
99 if (tcgetattr(fileno(f), &old_termios) >= 0) {
100 new_termios = old_termios;
102 new_termios.c_lflag &= ~ICANON;
103 new_termios.c_cc[VMIN] = 1;
104 new_termios.c_cc[VTIME] = 0;
106 if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
109 if (t != USEC_INFINITY) {
110 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) {
111 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
116 k = fread(&c, 1, 1, f);
118 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
124 *need_nl = c != '\n';
131 if (t != USEC_INFINITY) {
132 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0)
137 if (!fgets(line, sizeof(line), f))
138 return errno > 0 ? -errno : -EIO;
142 if (strlen(line) != 1)
152 #define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC)
154 int ask_char(char *ret, const char *replies, const char *fmt, ...) {
166 if (colors_enabled())
167 fputs(ANSI_HIGHLIGHT, stdout);
175 if (colors_enabled())
176 fputs(ANSI_NORMAL, stdout);
180 r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl);
187 puts("Bad input, please try again.");
198 if (strchr(replies, c)) {
203 puts("Read unexpected character, please try again.");
207 int ask_string(char **ret, const char *text, ...) {
215 if (colors_enabled())
216 fputs(ANSI_HIGHLIGHT, stdout);
222 if (colors_enabled())
223 fputs(ANSI_NORMAL, stdout);
228 if (!fgets(line, sizeof(line), stdin))
229 return errno > 0 ? -errno : -EIO;
231 if (!endswith(line, "\n"))
250 int reset_terminal_fd(int fd, bool switch_to_text) {
251 struct termios termios;
254 /* Set terminal to some sane defaults */
258 /* We leave locked terminal attributes untouched, so that
259 * Plymouth may set whatever it wants to set, and we don't
260 * interfere with that. */
262 /* Disable exclusive mode, just in case */
263 (void) ioctl(fd, TIOCNXCL);
265 /* Switch to text mode */
267 (void) ioctl(fd, KDSETMODE, KD_TEXT);
269 /* Set default keyboard mode */
270 (void) vt_reset_keyboard(fd);
272 if (tcgetattr(fd, &termios) < 0) {
277 /* We only reset the stuff that matters to the software. How
278 * hardware is set up we don't touch assuming that somebody
279 * else will do that for us */
281 termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
282 termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
283 termios.c_oflag |= ONLCR;
284 termios.c_cflag |= CREAD;
285 termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
287 termios.c_cc[VINTR] = 03; /* ^C */
288 termios.c_cc[VQUIT] = 034; /* ^\ */
289 termios.c_cc[VERASE] = 0177;
290 termios.c_cc[VKILL] = 025; /* ^X */
291 termios.c_cc[VEOF] = 04; /* ^D */
292 termios.c_cc[VSTART] = 021; /* ^Q */
293 termios.c_cc[VSTOP] = 023; /* ^S */
294 termios.c_cc[VSUSP] = 032; /* ^Z */
295 termios.c_cc[VLNEXT] = 026; /* ^V */
296 termios.c_cc[VWERASE] = 027; /* ^W */
297 termios.c_cc[VREPRINT] = 022; /* ^R */
298 termios.c_cc[VEOL] = 0;
299 termios.c_cc[VEOL2] = 0;
301 termios.c_cc[VTIME] = 0;
302 termios.c_cc[VMIN] = 1;
304 if (tcsetattr(fd, TCSANOW, &termios) < 0)
308 /* Just in case, flush all crap out */
309 (void) tcflush(fd, TCIOFLUSH);
314 int reset_terminal(const char *name) {
315 _cleanup_close_ int fd = -1;
317 /* We open the terminal with O_NONBLOCK here, to ensure we
318 * don't block on carrier if this is a terminal with carrier
321 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
325 return reset_terminal_fd(fd, true);
329 int open_terminal(const char *name, int mode) {
334 * If a TTY is in the process of being closed opening it might
335 * cause EIO. This is horribly awful, but unlikely to be
336 * changed in the kernel. Hence we work around this problem by
337 * retrying a couple of times.
339 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
346 fd = open(name, mode, 0);
353 /* Max 1s in total */
357 usleep(50 * USEC_PER_MSEC);
361 if (isatty(fd) <= 0) {
369 #if 0 /// UNNEEDED by elogind
370 int acquire_terminal(
372 AcquireTerminalFlags flags,
375 _cleanup_close_ int notify = -1, fd = -1;
376 usec_t ts = USEC_INFINITY;
380 assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT));
382 /* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually
383 * acquire it, so that we don't lose any event.
385 * Note: strictly speaking this actually watches for the device being closed, it does *not* really watch
386 * whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty
387 * *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to
388 * not configure any service on the same tty as an untrusted user this should not be a problem. (Which they
389 * probably should not do anyway.) */
391 if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) {
392 notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0));
396 wd = inotify_add_watch(notify, name, IN_CLOSE);
400 if (timeout != USEC_INFINITY)
401 ts = now(CLOCK_MONOTONIC);
405 struct sigaction sa_old, sa_new = {
406 .sa_handler = SIG_IGN,
407 .sa_flags = SA_RESTART,
411 r = flush_fd(notify);
416 /* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way
417 * to figure out if we successfully became the controlling process of the tty */
418 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
422 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */
423 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
425 /* First, try to get the tty */
426 r = ioctl(fd, TIOCSCTTY,
427 (flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0;
429 /* Reset signal handler to old value */
430 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
432 /* Success? Exit the loop now! */
436 /* Any failure besides -EPERM? Fail, regardless of the mode. */
440 if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this
441 * into a success. Note that EPERM is also returned if we
442 * already are the owner of the TTY. */
445 if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */
452 union inotify_event_buffer buffer;
453 struct inotify_event *e;
456 if (timeout != USEC_INFINITY) {
459 assert(ts != USEC_INFINITY);
461 n = now(CLOCK_MONOTONIC);
462 if (ts + timeout < n)
465 r = fd_wait_for_event(notify, POLLIN, ts + timeout - n);
472 l = read(notify, &buffer, sizeof(buffer));
474 if (IN_SET(errno, EINTR, EAGAIN))
480 FOREACH_INOTIFY_EVENT(e, buffer, l) {
481 if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */
484 if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */
491 /* We close the tty fd here since if the old session ended our handle will be dead. It's important that
492 * we do this after sleeping, so that we don't enter an endless loop. */
500 #if 0 /// UNNEEDED by elogind
501 int release_terminal(void) {
502 static const struct sigaction sa_new = {
503 .sa_handler = SIG_IGN,
504 .sa_flags = SA_RESTART,
507 _cleanup_close_ int fd = -1;
508 struct sigaction sa_old;
511 fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
515 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
516 * by our own TIOCNOTTY */
517 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
519 r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0;
521 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
526 int terminal_vhangup_fd(int fd) {
529 if (ioctl(fd, TIOCVHANGUP) < 0)
535 int terminal_vhangup(const char *name) {
536 _cleanup_close_ int fd;
538 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
542 return terminal_vhangup_fd(fd);
545 int vt_disallocate(const char *name) {
546 _cleanup_close_ int fd = -1;
551 /* Deallocate the VT if possible. If not possible
552 * (i.e. because it is the active one), at least clear it
553 * entirely (including the scrollback buffer) */
555 e = path_startswith(name, "/dev/");
559 if (!tty_is_vc(name)) {
560 /* So this is not a VT. I guess we cannot deallocate
561 * it then. But let's at least clear the screen */
563 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
568 "\033[r" /* clear scrolling region */
569 "\033[H" /* move home */
570 "\033[2J", /* clear screen */
575 n = startswith(e, "tty");
579 r = safe_atou(n, &u);
586 /* Try to deallocate */
587 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
591 r = ioctl(fd, VT_DISALLOCATE, u);
600 /* Couldn't deallocate, so let's clear it fully with
602 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
607 "\033[r" /* clear scrolling region */
608 "\033[H" /* move home */
609 "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */
614 int make_console_stdio(void) {
617 /* Make /dev/console the controlling terminal and stdin/stdout/stderr */
619 fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY);
621 return log_error_errno(fd, "Failed to acquire terminal: %m");
623 r = reset_terminal_fd(fd, true);
625 log_warning_errno(r, "Failed to reset terminal, ignoring: %m");
627 r = rearrange_stdio(fd, fd, fd); /* This invalidates 'fd' both on success and on failure. */
629 return log_error_errno(r, "Failed to make terminal stdin/stdout/stderr: %m");
631 reset_terminal_feature_caches();
637 bool tty_is_vc(const char *tty) {
640 return vtnr_from_tty(tty) >= 0;
643 bool tty_is_console(const char *tty) {
646 return streq(skip_dev_prefix(tty), "console");
649 int vtnr_from_tty(const char *tty) {
654 tty = skip_dev_prefix(tty);
656 if (!startswith(tty, "tty") )
659 if (tty[3] < '0' || tty[3] > '9')
662 r = safe_atoi(tty+3, &i);
672 #if 0 /// UNNEEDED by elogind
673 int resolve_dev_console(char **ret) {
674 _cleanup_free_ char *active = NULL;
680 /* Resolve where /dev/console is pointing to, if /sys is actually ours (i.e. not read-only-mounted which is a
681 * sign for container setups) */
683 if (path_is_read_only_fs("/sys") > 0)
686 r = read_one_line_file("/sys/class/tty/console/active", &active);
690 /* If multiple log outputs are configured the last one is what /dev/console points to */
691 tty = strrchr(active, ' ');
697 if (streq(tty, "tty0")) {
698 active = mfree(active);
700 /* Get the active VC (e.g. tty1) */
701 r = read_one_line_file("/sys/class/tty/tty0/active", &active);
709 *ret = TAKE_PTR(active);
723 int get_kernel_consoles(char ***ret) {
724 _cleanup_strv_free_ char **l = NULL;
725 _cleanup_free_ char *line = NULL;
731 /* If /sys is mounted read-only this means we are running in some kind of container environment. In that
732 * case /sys would reflect the host system, not us, hence ignore the data we can read from it. */
733 if (path_is_read_only_fs("/sys") > 0)
736 r = read_one_line_file("/sys/class/tty/console/active", &line);
742 _cleanup_free_ char *tty = NULL;
745 r = extract_first_word(&p, &tty, NULL, 0);
751 if (streq(tty, "tty0")) {
753 r = read_one_line_file("/sys/class/tty/tty0/active", &tty);
758 path = strappend("/dev/", tty);
762 if (access(path, F_OK) < 0) {
763 log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path);
768 r = strv_consume(&l, path);
773 if (strv_isempty(l)) {
774 log_debug("No devices found for system console");
783 r = strv_extend(&l, "/dev/console");
792 bool tty_is_vc_resolve(const char *tty) {
793 _cleanup_free_ char *resolved = NULL;
797 tty = skip_dev_prefix(tty);
799 if (streq(tty, "console")) {
800 if (resolve_dev_console(&resolved) < 0)
806 return tty_is_vc(tty);
809 const char *default_term_for_tty(const char *tty) {
810 return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220";
814 int fd_columns(int fd) {
815 struct winsize ws = {};
817 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
826 unsigned columns(void) {
830 if (cached_columns > 0)
831 return cached_columns;
834 e = getenv("COLUMNS");
836 (void) safe_atoi(e, &c);
839 c = fd_columns(STDOUT_FILENO);
845 return cached_columns;
848 int fd_lines(int fd) {
849 struct winsize ws = {};
851 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
860 unsigned lines(void) {
864 if (cached_lines > 0)
870 (void) safe_atoi(e, &l);
873 l = fd_lines(STDOUT_FILENO);
882 /* intended to be used as a SIGWINCH sighandler */
883 #if 0 /// UNNEEDED by elogind
884 void columns_lines_cache_reset(int signum) {
890 void reset_terminal_feature_caches(void) {
894 cached_colors_enabled = -1;
895 cached_underline_enabled = -1;
900 if (cached_on_tty < 0)
901 cached_on_tty = isatty(STDOUT_FILENO) > 0;
903 return cached_on_tty;
906 int getttyname_malloc(int fd, char **ret) {
916 r = ttyname_r(fd, path, sizeof(path));
920 c = strdup(skip_dev_prefix(path));
937 int getttyname_harder(int fd, char **r) {
941 k = getttyname_malloc(fd, &s);
945 if (streq(s, "tty")) {
947 return get_ctty(0, NULL, r);
954 int get_ctty_devnr(pid_t pid, dev_t *d) {
956 _cleanup_free_ char *line = NULL;
962 p = procfs_file_alloca(pid, "stat");
963 r = read_one_line_file(p, &line);
967 p = strrchr(line, ')');
982 if (major(ttynr) == 0 && minor(ttynr) == 0)
991 int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
992 char fn[STRLEN("/dev/char/") + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL;
993 _cleanup_free_ char *s = NULL;
1000 k = get_ctty_devnr(pid, &devnr);
1004 sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr));
1006 k = readlink_malloc(fn, &s);
1012 /* This is an ugly hack */
1013 if (major(devnr) == 136) {
1014 if (asprintf(&b, "pts/%u", minor(devnr)) < 0)
1017 /* Probably something like the ptys which have no
1018 * symlink in /dev/char. Let's return something
1019 * vaguely useful. */
1026 if (startswith(s, "/dev/"))
1028 else if (startswith(s, "../"))
1045 #if 0 /// UNNEEDED by elogind
1046 int ptsname_malloc(int fd, char **ret) {
1059 if (ptsname_r(fd, c, l) == 0) {
1063 if (errno != ERANGE) {
1073 int ptsname_namespace(int pty, char **ret) {
1076 /* Like ptsname(), but doesn't assume that the path is
1077 * accessible in the local namespace. */
1079 r = ioctl(pty, TIOCGPTN, &no);
1086 if (asprintf(ret, "/dev/pts/%i", no) < 0)
1092 int openpt_in_namespace(pid_t pid, int flags) {
1093 _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1;
1094 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1100 r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd);
1104 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
1107 r = safe_fork("(sd-openpt)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child);
1113 pair[0] = safe_close(pair[0]);
1115 r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd);
1117 _exit(EXIT_FAILURE);
1119 master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC);
1121 _exit(EXIT_FAILURE);
1123 if (unlockpt(master) < 0)
1124 _exit(EXIT_FAILURE);
1126 if (send_one_fd(pair[1], master, 0) < 0)
1127 _exit(EXIT_FAILURE);
1129 _exit(EXIT_SUCCESS);
1132 pair[1] = safe_close(pair[1]);
1134 r = wait_for_terminate_and_check("(sd-openpt)", child, 0);
1137 if (r != EXIT_SUCCESS)
1140 return receive_one_fd(pair[0], 0);
1143 int open_terminal_in_namespace(pid_t pid, const char *name, int mode) {
1144 _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1;
1145 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1149 r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd);
1153 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
1156 r = safe_fork("(sd-terminal)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child);
1162 pair[0] = safe_close(pair[0]);
1164 r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd);
1166 _exit(EXIT_FAILURE);
1168 master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC);
1170 _exit(EXIT_FAILURE);
1172 if (send_one_fd(pair[1], master, 0) < 0)
1173 _exit(EXIT_FAILURE);
1175 _exit(EXIT_SUCCESS);
1178 pair[1] = safe_close(pair[1]);
1180 r = wait_for_terminate_and_check("(sd-terminal)", child, 0);
1183 if (r != EXIT_SUCCESS)
1186 return receive_one_fd(pair[0], 0);
1190 static bool getenv_terminal_is_dumb(void) {
1197 return streq(e, "dumb");
1200 bool terminal_is_dumb(void) {
1204 return getenv_terminal_is_dumb();
1207 bool colors_enabled(void) {
1209 /* Returns true if colors are considered supported on our stdout. For that we check $SYSTEMD_COLORS first
1210 * (which is the explicit way to turn colors on/off). If that didn't work we turn colors off unless we are on a
1211 * TTY. And if we are on a TTY we turn it off if $TERM is set to "dumb". There's one special tweak though: if
1212 * we are PID 1 then we do not check whether we are connected to a TTY, because we don't keep /dev/console open
1213 * continously due to fear of SAK, and hence things are a bit weird. */
1215 if (cached_colors_enabled < 0) {
1216 #if 0 /// elogind does not allow such forcing, and we are never init!
1219 val = getenv_bool("SYSTEMD_COLORS");
1221 cached_colors_enabled = val;
1222 else if (getpid_cached() == 1)
1223 /* PID1 outputs to the console without holding it open all the time */
1224 cached_colors_enabled = !getenv_terminal_is_dumb();
1227 cached_colors_enabled = !terminal_is_dumb();
1230 return cached_colors_enabled;
1233 #if 0 /// UNNEEDED by elogind
1234 bool dev_console_colors_enabled(void) {
1235 _cleanup_free_ char *s = NULL;
1238 /* Returns true if we assume that color is supported on /dev/console.
1240 * For that we first check if we explicitly got told to use colors or not, by checking $SYSTEMD_COLORS. If that
1241 * isn't set we check whether PID 1 has $TERM set, and if not, whether TERM is set on the kernel command
1242 * line. If we find $TERM set we assume color if it's not set to "dumb", similarly to how regular
1243 * colors_enabled() operates. */
1245 b = getenv_bool("SYSTEMD_COLORS");
1249 if (getenv_for_pid(1, "TERM", &s) <= 0)
1250 (void) proc_cmdline_get_key("TERM", 0, &s);
1252 return !streq_ptr(s, "dumb");
1256 bool underline_enabled(void) {
1258 if (cached_underline_enabled < 0) {
1260 /* The Linux console doesn't support underlining, turn it off, but only there. */
1262 if (colors_enabled())
1263 cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux");
1265 cached_underline_enabled = false;
1268 return cached_underline_enabled;
1271 int vt_default_utf8(void) {
1272 _cleanup_free_ char *b = NULL;
1275 /* Read the default VT UTF8 setting from the kernel */
1277 r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b);
1281 return parse_boolean(b);
1284 int vt_reset_keyboard(int fd) {
1287 /* If we can't read the default, then default to unicode. It's 2017 after all. */
1288 kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE;
1290 if (ioctl(fd, KDSKBMODE, kb) < 0)
1296 static bool urlify_enabled(void) {
1297 static int cached_urlify_enabled = -1;
1299 /* Unfortunately 'less' doesn't support links like this yet ðŸ˜, hence let's disable this as long as there's a
1300 * pager in effect. Let's drop this check as soon as less got fixed a and enough time passed so that it's safe
1301 * to assume that a link-enabled 'less' version has hit most installations. */
1303 if (cached_urlify_enabled < 0) {
1306 val = getenv_bool("SYSTEMD_URLIFY");
1308 cached_urlify_enabled = val;
1310 cached_urlify_enabled = colors_enabled() && !pager_have();
1313 return cached_urlify_enabled;
1316 int terminal_urlify(const char *url, const char *text, char **ret) {
1321 /* Takes an URL and a pretty string and formats it as clickable link for the terminal. See
1322 * https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda for details. */
1327 if (urlify_enabled())
1328 n = strjoin("\x1B]8;;", url, "\a", text, "\x1B]8;;\a");
1338 int terminal_urlify_path(const char *path, const char *text, char **ret) {
1339 _cleanup_free_ char *absolute = NULL;
1346 /* Much like terminal_urlify() above, but takes a file system path as input
1347 * and turns it into a proper file:// URL first. */
1355 if (!urlify_enabled()) {
1369 if (!path_is_absolute(path)) {
1370 r = path_make_absolute_cwd(path, &absolute);
1377 /* As suggested by https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda, let's include the local
1378 * hostname here. Note that we don't use gethostname_malloc() or gethostname_strict() since we are interested
1379 * in the raw string the kernel has set, whatever it may be, under the assumption that terminals are not overly
1380 * careful with validating the strings either. */
1382 url = strjoina("file://", u.nodename, path);
1384 return terminal_urlify(url, text, ret);
1387 static int cat_file(const char *filename, bool newline) {
1388 _cleanup_fclose_ FILE *f = NULL;
1391 f = fopen(filename, "re");
1395 printf("%s%s# %s%s\n",
1396 newline ? "\n" : "",
1397 ansi_highlight_blue(),
1403 _cleanup_free_ char *line = NULL;
1405 r = read_line(f, LONG_LINE_MAX, &line);
1407 return log_error_errno(r, "Failed to read \"%s\": %m", filename);
1417 int cat_files(const char *file, char **dropins, CatFlags flags) {
1422 r = cat_file(file, false);
1423 if (r == -ENOENT && (flags & CAT_FLAGS_MAIN_FILE_OPTIONAL))
1424 printf("%s# config file %s not found%s\n",
1425 ansi_highlight_magenta(),
1429 return log_warning_errno(r, "Failed to cat %s: %m", file);
1432 STRV_FOREACH(path, dropins) {
1433 r = cat_file(*path, file || path != dropins);
1435 return log_warning_errno(r, "Failed to cat %s: %m", *path);