1 /* SPDX-License-Identifier: LGPL-2.1+ */
7 #include <linux/tiocl.h>
15 #include <sys/inotify.h>
16 //#include <sys/ioctl.h>
17 #include <sys/socket.h>
18 #include <sys/sysmacros.h>
20 #include <sys/types.h>
21 //#include <sys/utsname.h>
25 #include "alloc-util.h"
36 #include "parse-util.h"
37 //#include "path-util.h"
38 //#include "proc-cmdline.h"
39 #include "process-util.h"
40 #include "socket-util.h"
41 #include "stat-util.h"
42 #include "string-util.h"
44 #include "terminal-util.h"
45 #include "time-util.h"
48 /// Additional includes needed by elogind
49 #include "path-util.h"
51 static volatile unsigned cached_columns = 0;
52 static volatile unsigned cached_lines = 0;
54 static volatile int cached_on_tty = -1;
55 static volatile int cached_colors_enabled = -1;
56 static volatile int cached_underline_enabled = -1;
59 _cleanup_close_ int fd;
61 /* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go,
62 * if that's configured. */
64 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
70 TIOCL_GETKMSGREDIRECT,
74 if (ioctl(fd, TIOCLINUX, tiocl) < 0)
77 vt = tiocl[0] <= 0 ? 1 : tiocl[0];
80 if (ioctl(fd, VT_ACTIVATE, vt) < 0)
86 #if 0 /// UNNEEDED by elogind
87 int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
88 struct termios old_termios, new_termios;
89 char c, line[LINE_MAX];
94 if (tcgetattr(fileno(f), &old_termios) >= 0) {
95 new_termios = old_termios;
97 new_termios.c_lflag &= ~ICANON;
98 new_termios.c_cc[VMIN] = 1;
99 new_termios.c_cc[VTIME] = 0;
101 if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
104 if (t != USEC_INFINITY) {
105 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) {
106 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
111 k = fread(&c, 1, 1, f);
113 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
119 *need_nl = c != '\n';
126 if (t != USEC_INFINITY) {
127 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0)
132 if (!fgets(line, sizeof(line), f))
133 return errno > 0 ? -errno : -EIO;
137 if (strlen(line) != 1)
147 #define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC)
149 int ask_char(char *ret, const char *replies, const char *fmt, ...) {
161 if (colors_enabled())
162 fputs(ANSI_HIGHLIGHT, stdout);
170 if (colors_enabled())
171 fputs(ANSI_NORMAL, stdout);
175 r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl);
182 puts("Bad input, please try again.");
193 if (strchr(replies, c)) {
198 puts("Read unexpected character, please try again.");
202 int ask_string(char **ret, const char *text, ...) {
210 if (colors_enabled())
211 fputs(ANSI_HIGHLIGHT, stdout);
217 if (colors_enabled())
218 fputs(ANSI_NORMAL, stdout);
223 if (!fgets(line, sizeof(line), stdin))
224 return errno > 0 ? -errno : -EIO;
226 if (!endswith(line, "\n"))
245 int reset_terminal_fd(int fd, bool switch_to_text) {
246 struct termios termios;
249 /* Set terminal to some sane defaults */
253 /* We leave locked terminal attributes untouched, so that
254 * Plymouth may set whatever it wants to set, and we don't
255 * interfere with that. */
257 /* Disable exclusive mode, just in case */
258 (void) ioctl(fd, TIOCNXCL);
260 /* Switch to text mode */
262 (void) ioctl(fd, KDSETMODE, KD_TEXT);
264 /* Set default keyboard mode */
265 (void) vt_reset_keyboard(fd);
267 if (tcgetattr(fd, &termios) < 0) {
272 /* We only reset the stuff that matters to the software. How
273 * hardware is set up we don't touch assuming that somebody
274 * else will do that for us */
276 termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
277 termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
278 termios.c_oflag |= ONLCR;
279 termios.c_cflag |= CREAD;
280 termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
282 termios.c_cc[VINTR] = 03; /* ^C */
283 termios.c_cc[VQUIT] = 034; /* ^\ */
284 termios.c_cc[VERASE] = 0177;
285 termios.c_cc[VKILL] = 025; /* ^X */
286 termios.c_cc[VEOF] = 04; /* ^D */
287 termios.c_cc[VSTART] = 021; /* ^Q */
288 termios.c_cc[VSTOP] = 023; /* ^S */
289 termios.c_cc[VSUSP] = 032; /* ^Z */
290 termios.c_cc[VLNEXT] = 026; /* ^V */
291 termios.c_cc[VWERASE] = 027; /* ^W */
292 termios.c_cc[VREPRINT] = 022; /* ^R */
293 termios.c_cc[VEOL] = 0;
294 termios.c_cc[VEOL2] = 0;
296 termios.c_cc[VTIME] = 0;
297 termios.c_cc[VMIN] = 1;
299 if (tcsetattr(fd, TCSANOW, &termios) < 0)
303 /* Just in case, flush all crap out */
304 (void) tcflush(fd, TCIOFLUSH);
309 int reset_terminal(const char *name) {
310 _cleanup_close_ int fd = -1;
312 /* We open the terminal with O_NONBLOCK here, to ensure we
313 * don't block on carrier if this is a terminal with carrier
316 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
320 return reset_terminal_fd(fd, true);
324 int open_terminal(const char *name, int mode) {
329 * If a TTY is in the process of being closed opening it might
330 * cause EIO. This is horribly awful, but unlikely to be
331 * changed in the kernel. Hence we work around this problem by
332 * retrying a couple of times.
334 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
341 fd = open(name, mode, 0);
348 /* Max 1s in total */
352 usleep(50 * USEC_PER_MSEC);
356 if (isatty(fd) <= 0) {
364 #if 0 /// UNNEEDED by elogind
365 int acquire_terminal(
367 AcquireTerminalFlags flags,
370 _cleanup_close_ int notify = -1, fd = -1;
371 usec_t ts = USEC_INFINITY;
375 assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT));
377 /* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually
378 * acquire it, so that we don't lose any event.
380 * Note: strictly speaking this actually watches for the device being closed, it does *not* really watch
381 * whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty
382 * *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to
383 * not configure any service on the same tty as an untrusted user this should not be a problem. (Which they
384 * probably should not do anyway.) */
386 if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) {
387 notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0));
391 wd = inotify_add_watch(notify, name, IN_CLOSE);
395 if (timeout != USEC_INFINITY)
396 ts = now(CLOCK_MONOTONIC);
400 struct sigaction sa_old, sa_new = {
401 .sa_handler = SIG_IGN,
402 .sa_flags = SA_RESTART,
406 r = flush_fd(notify);
411 /* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way
412 * to figure out if we successfully became the controlling process of the tty */
413 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
417 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */
418 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
420 /* First, try to get the tty */
421 r = ioctl(fd, TIOCSCTTY,
422 (flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0;
424 /* Reset signal handler to old value */
425 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
427 /* Success? Exit the loop now! */
431 /* Any failure besides -EPERM? Fail, regardless of the mode. */
435 if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this
436 * into a success. Note that EPERM is also returned if we
437 * already are the owner of the TTY. */
440 if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */
447 union inotify_event_buffer buffer;
448 struct inotify_event *e;
451 if (timeout != USEC_INFINITY) {
454 assert(ts != USEC_INFINITY);
456 n = now(CLOCK_MONOTONIC);
457 if (ts + timeout < n)
460 r = fd_wait_for_event(notify, POLLIN, ts + timeout - n);
467 l = read(notify, &buffer, sizeof(buffer));
469 if (IN_SET(errno, EINTR, EAGAIN))
475 FOREACH_INOTIFY_EVENT(e, buffer, l) {
476 if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */
479 if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */
486 /* We close the tty fd here since if the old session ended our handle will be dead. It's important that
487 * we do this after sleeping, so that we don't enter an endless loop. */
495 #if 0 /// UNNEEDED by elogind
496 int release_terminal(void) {
497 static const struct sigaction sa_new = {
498 .sa_handler = SIG_IGN,
499 .sa_flags = SA_RESTART,
502 _cleanup_close_ int fd = -1;
503 struct sigaction sa_old;
506 fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
510 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
511 * by our own TIOCNOTTY */
512 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
514 r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0;
516 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
521 int terminal_vhangup_fd(int fd) {
524 if (ioctl(fd, TIOCVHANGUP) < 0)
530 int terminal_vhangup(const char *name) {
531 _cleanup_close_ int fd;
533 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
537 return terminal_vhangup_fd(fd);
540 int vt_disallocate(const char *name) {
541 _cleanup_close_ int fd = -1;
546 /* Deallocate the VT if possible. If not possible
547 * (i.e. because it is the active one), at least clear it
548 * entirely (including the scrollback buffer) */
550 e = path_startswith(name, "/dev/");
554 if (!tty_is_vc(name)) {
555 /* So this is not a VT. I guess we cannot deallocate
556 * it then. But let's at least clear the screen */
558 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
563 "\033[r" /* clear scrolling region */
564 "\033[H" /* move home */
565 "\033[2J", /* clear screen */
570 n = startswith(e, "tty");
574 r = safe_atou(n, &u);
581 /* Try to deallocate */
582 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
586 r = ioctl(fd, VT_DISALLOCATE, u);
595 /* Couldn't deallocate, so let's clear it fully with
597 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
602 "\033[r" /* clear scrolling region */
603 "\033[H" /* move home */
604 "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */
609 int make_console_stdio(void) {
612 /* Make /dev/console the controlling terminal and stdin/stdout/stderr */
614 fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY);
616 return log_error_errno(fd, "Failed to acquire terminal: %m");
618 r = reset_terminal_fd(fd, true);
620 log_warning_errno(r, "Failed to reset terminal, ignoring: %m");
622 r = rearrange_stdio(fd, fd, fd); /* This invalidates 'fd' both on success and on failure. */
624 return log_error_errno(r, "Failed to make terminal stdin/stdout/stderr: %m");
626 reset_terminal_feature_caches();
632 bool tty_is_vc(const char *tty) {
635 return vtnr_from_tty(tty) >= 0;
638 bool tty_is_console(const char *tty) {
641 return streq(skip_dev_prefix(tty), "console");
644 int vtnr_from_tty(const char *tty) {
649 tty = skip_dev_prefix(tty);
651 if (!startswith(tty, "tty") )
654 if (tty[3] < '0' || tty[3] > '9')
657 r = safe_atoi(tty+3, &i);
667 #if 0 /// UNNEEDED by elogind
668 int resolve_dev_console(char **ret) {
669 _cleanup_free_ char *active = NULL;
675 /* Resolve where /dev/console is pointing to, if /sys is actually ours (i.e. not read-only-mounted which is a
676 * sign for container setups) */
678 if (path_is_read_only_fs("/sys") > 0)
681 r = read_one_line_file("/sys/class/tty/console/active", &active);
685 /* If multiple log outputs are configured the last one is what /dev/console points to */
686 tty = strrchr(active, ' ');
692 if (streq(tty, "tty0")) {
693 active = mfree(active);
695 /* Get the active VC (e.g. tty1) */
696 r = read_one_line_file("/sys/class/tty/tty0/active", &active);
704 *ret = TAKE_PTR(active);
718 int get_kernel_consoles(char ***ret) {
719 _cleanup_strv_free_ char **l = NULL;
720 _cleanup_free_ char *line = NULL;
726 /* If /sys is mounted read-only this means we are running in some kind of container environment. In that
727 * case /sys would reflect the host system, not us, hence ignore the data we can read from it. */
728 if (path_is_read_only_fs("/sys") > 0)
731 r = read_one_line_file("/sys/class/tty/console/active", &line);
737 _cleanup_free_ char *tty = NULL;
740 r = extract_first_word(&p, &tty, NULL, 0);
746 if (streq(tty, "tty0")) {
748 r = read_one_line_file("/sys/class/tty/tty0/active", &tty);
753 path = strappend("/dev/", tty);
757 if (access(path, F_OK) < 0) {
758 log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path);
763 r = strv_consume(&l, path);
768 if (strv_isempty(l)) {
769 log_debug("No devices found for system console");
778 r = strv_extend(&l, "/dev/console");
787 bool tty_is_vc_resolve(const char *tty) {
788 _cleanup_free_ char *resolved = NULL;
792 tty = skip_dev_prefix(tty);
794 if (streq(tty, "console")) {
795 if (resolve_dev_console(&resolved) < 0)
801 return tty_is_vc(tty);
804 const char *default_term_for_tty(const char *tty) {
805 return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220";
809 int fd_columns(int fd) {
810 struct winsize ws = {};
812 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
821 unsigned columns(void) {
825 if (cached_columns > 0)
826 return cached_columns;
829 e = getenv("COLUMNS");
831 (void) safe_atoi(e, &c);
834 c = fd_columns(STDOUT_FILENO);
840 return cached_columns;
843 int fd_lines(int fd) {
844 struct winsize ws = {};
846 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
855 unsigned lines(void) {
859 if (cached_lines > 0)
865 (void) safe_atoi(e, &l);
868 l = fd_lines(STDOUT_FILENO);
877 /* intended to be used as a SIGWINCH sighandler */
878 #if 0 /// UNNEEDED by elogind
879 void columns_lines_cache_reset(int signum) {
885 void reset_terminal_feature_caches(void) {
889 cached_colors_enabled = -1;
890 cached_underline_enabled = -1;
896 /* We check both stdout and stderr, so that situations where pipes on the shell are used are reliably
897 * recognized, regardless if only the output or the errors are piped to some place. Since on_tty() is generally
898 * used to default to a safer, non-interactive, non-color mode of operation it's probably good to be defensive
899 * here, and check for both. Note that we don't check for STDIN_FILENO, because it should fine to use fancy
900 * terminal functionality when outputting stuff, even if the input is piped to us. */
902 if (cached_on_tty < 0)
904 isatty(STDOUT_FILENO) > 0 &&
905 isatty(STDERR_FILENO) > 0;
907 return cached_on_tty;
910 int getttyname_malloc(int fd, char **ret) {
920 r = ttyname_r(fd, path, sizeof(path));
924 c = strdup(skip_dev_prefix(path));
941 int getttyname_harder(int fd, char **r) {
945 k = getttyname_malloc(fd, &s);
949 if (streq(s, "tty")) {
951 return get_ctty(0, NULL, r);
958 int get_ctty_devnr(pid_t pid, dev_t *d) {
960 _cleanup_free_ char *line = NULL;
966 p = procfs_file_alloca(pid, "stat");
967 r = read_one_line_file(p, &line);
971 p = strrchr(line, ')');
986 if (major(ttynr) == 0 && minor(ttynr) == 0)
995 int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
996 char fn[STRLEN("/dev/char/") + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL;
997 _cleanup_free_ char *s = NULL;
1004 k = get_ctty_devnr(pid, &devnr);
1008 sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr));
1010 k = readlink_malloc(fn, &s);
1016 /* This is an ugly hack */
1017 if (major(devnr) == 136) {
1018 if (asprintf(&b, "pts/%u", minor(devnr)) < 0)
1021 /* Probably something like the ptys which have no
1022 * symlink in /dev/char. Let's return something
1023 * vaguely useful. */
1030 if (startswith(s, "/dev/"))
1032 else if (startswith(s, "../"))
1049 #if 0 /// UNNEEDED by elogind
1050 int ptsname_malloc(int fd, char **ret) {
1063 if (ptsname_r(fd, c, l) == 0) {
1067 if (errno != ERANGE) {
1077 int ptsname_namespace(int pty, char **ret) {
1080 /* Like ptsname(), but doesn't assume that the path is
1081 * accessible in the local namespace. */
1083 r = ioctl(pty, TIOCGPTN, &no);
1090 if (asprintf(ret, "/dev/pts/%i", no) < 0)
1096 int openpt_in_namespace(pid_t pid, int flags) {
1097 _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1;
1098 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1104 r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd);
1108 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
1111 r = safe_fork("(sd-openpt)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child);
1117 pair[0] = safe_close(pair[0]);
1119 r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd);
1121 _exit(EXIT_FAILURE);
1123 master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC);
1125 _exit(EXIT_FAILURE);
1127 if (unlockpt(master) < 0)
1128 _exit(EXIT_FAILURE);
1130 if (send_one_fd(pair[1], master, 0) < 0)
1131 _exit(EXIT_FAILURE);
1133 _exit(EXIT_SUCCESS);
1136 pair[1] = safe_close(pair[1]);
1138 r = wait_for_terminate_and_check("(sd-openpt)", child, 0);
1141 if (r != EXIT_SUCCESS)
1144 return receive_one_fd(pair[0], 0);
1147 int open_terminal_in_namespace(pid_t pid, const char *name, int mode) {
1148 _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1;
1149 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1153 r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd);
1157 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
1160 r = safe_fork("(sd-terminal)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child);
1166 pair[0] = safe_close(pair[0]);
1168 r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd);
1170 _exit(EXIT_FAILURE);
1172 master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC);
1174 _exit(EXIT_FAILURE);
1176 if (send_one_fd(pair[1], master, 0) < 0)
1177 _exit(EXIT_FAILURE);
1179 _exit(EXIT_SUCCESS);
1182 pair[1] = safe_close(pair[1]);
1184 r = wait_for_terminate_and_check("(sd-terminal)", child, 0);
1187 if (r != EXIT_SUCCESS)
1190 return receive_one_fd(pair[0], 0);
1194 static bool getenv_terminal_is_dumb(void) {
1201 return streq(e, "dumb");
1204 bool terminal_is_dumb(void) {
1208 return getenv_terminal_is_dumb();
1211 bool colors_enabled(void) {
1213 /* Returns true if colors are considered supported on our stdout. For that we check $SYSTEMD_COLORS first
1214 * (which is the explicit way to turn colors on/off). If that didn't work we turn colors off unless we are on a
1215 * 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
1216 * we are PID 1 then we do not check whether we are connected to a TTY, because we don't keep /dev/console open
1217 * continously due to fear of SAK, and hence things are a bit weird. */
1219 if (cached_colors_enabled < 0) {
1220 #if 0 /// elogind does not allow such forcing, and we are never init!
1223 val = getenv_bool("SYSTEMD_COLORS");
1225 cached_colors_enabled = val;
1226 else if (getpid_cached() == 1)
1227 /* PID1 outputs to the console without holding it open all the time */
1228 cached_colors_enabled = !getenv_terminal_is_dumb();
1231 cached_colors_enabled = !terminal_is_dumb();
1234 return cached_colors_enabled;
1237 #if 0 /// UNNEEDED by elogind
1238 bool dev_console_colors_enabled(void) {
1239 _cleanup_free_ char *s = NULL;
1242 /* Returns true if we assume that color is supported on /dev/console.
1244 * For that we first check if we explicitly got told to use colors or not, by checking $SYSTEMD_COLORS. If that
1245 * isn't set we check whether PID 1 has $TERM set, and if not, whether TERM is set on the kernel command
1246 * line. If we find $TERM set we assume color if it's not set to "dumb", similarly to how regular
1247 * colors_enabled() operates. */
1249 b = getenv_bool("SYSTEMD_COLORS");
1253 if (getenv_for_pid(1, "TERM", &s) <= 0)
1254 (void) proc_cmdline_get_key("TERM", 0, &s);
1256 return !streq_ptr(s, "dumb");
1260 bool underline_enabled(void) {
1262 if (cached_underline_enabled < 0) {
1264 /* The Linux console doesn't support underlining, turn it off, but only there. */
1266 if (colors_enabled())
1267 cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux");
1269 cached_underline_enabled = false;
1272 return cached_underline_enabled;
1275 int vt_default_utf8(void) {
1276 _cleanup_free_ char *b = NULL;
1279 /* Read the default VT UTF8 setting from the kernel */
1281 r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b);
1285 return parse_boolean(b);
1288 int vt_reset_keyboard(int fd) {
1291 /* If we can't read the default, then default to unicode. It's 2017 after all. */
1292 kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE;
1294 if (ioctl(fd, KDSKBMODE, kb) < 0)
1300 #if 0 /// UNNEEDED by elogind
1301 static bool urlify_enabled(void) {
1302 static int cached_urlify_enabled = -1;
1304 /* Unfortunately 'less' doesn't support links like this yet ðŸ˜, hence let's disable this as long as there's a
1305 * pager in effect. Let's drop this check as soon as less got fixed a and enough time passed so that it's safe
1306 * to assume that a link-enabled 'less' version has hit most installations. */
1308 if (cached_urlify_enabled < 0) {
1311 val = getenv_bool("SYSTEMD_URLIFY");
1313 cached_urlify_enabled = val;
1315 cached_urlify_enabled = colors_enabled() && !pager_have();
1318 return cached_urlify_enabled;
1321 int terminal_urlify(const char *url, const char *text, char **ret) {
1326 /* Takes an URL and a pretty string and formats it as clickable link for the terminal. See
1327 * https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda for details. */
1332 if (urlify_enabled())
1333 n = strjoin("\x1B]8;;", url, "\a", text, "\x1B]8;;\a");
1343 int terminal_urlify_path(const char *path, const char *text, char **ret) {
1344 _cleanup_free_ char *absolute = NULL;
1351 /* Much like terminal_urlify() above, but takes a file system path as input
1352 * and turns it into a proper file:// URL first. */
1360 if (!urlify_enabled()) {
1374 if (!path_is_absolute(path)) {
1375 r = path_make_absolute_cwd(path, &absolute);
1382 /* As suggested by https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda, let's include the local
1383 * hostname here. Note that we don't use gethostname_malloc() or gethostname_strict() since we are interested
1384 * in the raw string the kernel has set, whatever it may be, under the assumption that terminals are not overly
1385 * careful with validating the strings either. */
1387 url = strjoina("file://", u.nodename, path);
1389 return terminal_urlify(url, text, ret);
1392 static int cat_file(const char *filename, bool newline) {
1393 _cleanup_fclose_ FILE *f = NULL;
1394 _cleanup_free_ char *urlified = NULL;
1397 f = fopen(filename, "re");
1401 r = terminal_urlify_path(filename, NULL, &urlified);
1405 printf("%s%s# %s%s\n",
1406 newline ? "\n" : "",
1407 ansi_highlight_blue(),
1413 _cleanup_free_ char *line = NULL;
1415 r = read_line(f, LONG_LINE_MAX, &line);
1417 return log_error_errno(r, "Failed to read \"%s\": %m", filename);
1427 int cat_files(const char *file, char **dropins, CatFlags flags) {
1432 r = cat_file(file, false);
1433 if (r == -ENOENT && (flags & CAT_FLAGS_MAIN_FILE_OPTIONAL))
1434 printf("%s# config file %s not found%s\n",
1435 ansi_highlight_magenta(),
1439 return log_warning_errno(r, "Failed to cat %s: %m", file);
1442 STRV_FOREACH(path, dropins) {
1443 r = cat_file(*path, file || path != dropins);
1445 return log_warning_errno(r, "Failed to cat %s: %m", *path);
1451 void print_separator(void) {
1453 /* Outputs a separator line that resolves to whitespace when copied from the terminal. We do that by outputting
1454 * one line filled with spaces with ANSI underline set, followed by a second (empty) line. */
1456 if (underline_enabled()) {
1462 fputs_unlocked(ANSI_UNDERLINE, stdout);
1464 for (i = 0; i < c; i++)
1465 fputc_unlocked(' ', stdout);
1467 fputs_unlocked(ANSI_NORMAL "\n\n", stdout);
1468 funlockfile(stdout);
1470 fputs("\n\n", stdout);