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"
40 #include "parse-util.h"
41 //#include "path-util.h"
42 //#include "proc-cmdline.h"
43 #include "process-util.h"
44 #include "socket-util.h"
45 #include "stat-util.h"
46 #include "string-util.h"
48 #include "terminal-util.h"
49 #include "time-util.h"
52 /// Additional includes needed by elogind
53 #include "path-util.h"
55 static volatile unsigned cached_columns = 0;
56 static volatile unsigned cached_lines = 0;
58 static volatile int cached_on_tty = -1;
59 static volatile int cached_colors_enabled = -1;
60 static volatile int cached_underline_enabled = -1;
63 _cleanup_close_ int fd;
65 /* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go,
66 * if that's configured. */
68 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
74 TIOCL_GETKMSGREDIRECT,
78 if (ioctl(fd, TIOCLINUX, tiocl) < 0)
81 vt = tiocl[0] <= 0 ? 1 : tiocl[0];
84 if (ioctl(fd, VT_ACTIVATE, vt) < 0)
90 #if 0 /// UNNEEDED by elogind
91 int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
92 struct termios old_termios, new_termios;
93 char c, line[LINE_MAX];
98 if (tcgetattr(fileno(f), &old_termios) >= 0) {
99 new_termios = old_termios;
101 new_termios.c_lflag &= ~ICANON;
102 new_termios.c_cc[VMIN] = 1;
103 new_termios.c_cc[VTIME] = 0;
105 if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
108 if (t != USEC_INFINITY) {
109 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) {
110 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
115 k = fread(&c, 1, 1, f);
117 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
123 *need_nl = c != '\n';
130 if (t != USEC_INFINITY) {
131 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0)
136 if (!fgets(line, sizeof(line), f))
137 return errno > 0 ? -errno : -EIO;
141 if (strlen(line) != 1)
151 #define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC)
153 int ask_char(char *ret, const char *replies, const char *fmt, ...) {
165 if (colors_enabled())
166 fputs(ANSI_HIGHLIGHT, stdout);
174 if (colors_enabled())
175 fputs(ANSI_NORMAL, stdout);
179 r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl);
186 puts("Bad input, please try again.");
197 if (strchr(replies, c)) {
202 puts("Read unexpected character, please try again.");
206 int ask_string(char **ret, const char *text, ...) {
214 if (colors_enabled())
215 fputs(ANSI_HIGHLIGHT, stdout);
221 if (colors_enabled())
222 fputs(ANSI_NORMAL, stdout);
227 if (!fgets(line, sizeof(line), stdin))
228 return errno > 0 ? -errno : -EIO;
230 if (!endswith(line, "\n"))
249 int reset_terminal_fd(int fd, bool switch_to_text) {
250 struct termios termios;
253 /* Set terminal to some sane defaults */
257 /* We leave locked terminal attributes untouched, so that
258 * Plymouth may set whatever it wants to set, and we don't
259 * interfere with that. */
261 /* Disable exclusive mode, just in case */
262 (void) ioctl(fd, TIOCNXCL);
264 /* Switch to text mode */
266 (void) ioctl(fd, KDSETMODE, KD_TEXT);
268 /* Set default keyboard mode */
269 (void) vt_reset_keyboard(fd);
271 if (tcgetattr(fd, &termios) < 0) {
276 /* We only reset the stuff that matters to the software. How
277 * hardware is set up we don't touch assuming that somebody
278 * else will do that for us */
280 termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
281 termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
282 termios.c_oflag |= ONLCR;
283 termios.c_cflag |= CREAD;
284 termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
286 termios.c_cc[VINTR] = 03; /* ^C */
287 termios.c_cc[VQUIT] = 034; /* ^\ */
288 termios.c_cc[VERASE] = 0177;
289 termios.c_cc[VKILL] = 025; /* ^X */
290 termios.c_cc[VEOF] = 04; /* ^D */
291 termios.c_cc[VSTART] = 021; /* ^Q */
292 termios.c_cc[VSTOP] = 023; /* ^S */
293 termios.c_cc[VSUSP] = 032; /* ^Z */
294 termios.c_cc[VLNEXT] = 026; /* ^V */
295 termios.c_cc[VWERASE] = 027; /* ^W */
296 termios.c_cc[VREPRINT] = 022; /* ^R */
297 termios.c_cc[VEOL] = 0;
298 termios.c_cc[VEOL2] = 0;
300 termios.c_cc[VTIME] = 0;
301 termios.c_cc[VMIN] = 1;
303 if (tcsetattr(fd, TCSANOW, &termios) < 0)
307 /* Just in case, flush all crap out */
308 (void) tcflush(fd, TCIOFLUSH);
313 int reset_terminal(const char *name) {
314 _cleanup_close_ int fd = -1;
316 /* We open the terminal with O_NONBLOCK here, to ensure we
317 * don't block on carrier if this is a terminal with carrier
320 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
324 return reset_terminal_fd(fd, true);
328 int open_terminal(const char *name, int mode) {
333 * If a TTY is in the process of being closed opening it might
334 * cause EIO. This is horribly awful, but unlikely to be
335 * changed in the kernel. Hence we work around this problem by
336 * retrying a couple of times.
338 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
345 fd = open(name, mode, 0);
352 /* Max 1s in total */
356 usleep(50 * USEC_PER_MSEC);
360 if (isatty(fd) <= 0) {
368 #if 0 /// UNNEEDED by elogind
369 int acquire_terminal(
371 AcquireTerminalFlags flags,
374 _cleanup_close_ int notify = -1, fd = -1;
375 usec_t ts = USEC_INFINITY;
379 assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT));
381 /* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually
382 * acquire it, so that we don't lose any event.
384 * Note: strictly speaking this actually watches for the device being closed, it does *not* really watch
385 * whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty
386 * *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to
387 * not configure any service on the same tty as an untrusted user this should not be a problem. (Which they
388 * probably should not do anyway.) */
390 if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) {
391 notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0));
395 wd = inotify_add_watch(notify, name, IN_CLOSE);
399 if (timeout != USEC_INFINITY)
400 ts = now(CLOCK_MONOTONIC);
404 struct sigaction sa_old, sa_new = {
405 .sa_handler = SIG_IGN,
406 .sa_flags = SA_RESTART,
410 r = flush_fd(notify);
415 /* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way
416 * to figure out if we successfully became the controlling process of the tty */
417 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
421 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */
422 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
424 /* First, try to get the tty */
425 r = ioctl(fd, TIOCSCTTY,
426 (flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0;
428 /* Reset signal handler to old value */
429 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
431 /* Success? Exit the loop now! */
435 /* Any failure besides -EPERM? Fail, regardless of the mode. */
439 if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this
440 * into a success. Note that EPERM is also returned if we
441 * already are the owner of the TTY. */
444 if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */
451 union inotify_event_buffer buffer;
452 struct inotify_event *e;
455 if (timeout != USEC_INFINITY) {
458 assert(ts != USEC_INFINITY);
460 n = now(CLOCK_MONOTONIC);
461 if (ts + timeout < n)
464 r = fd_wait_for_event(notify, POLLIN, ts + timeout - n);
471 l = read(notify, &buffer, sizeof(buffer));
473 if (IN_SET(errno, EINTR, EAGAIN))
479 FOREACH_INOTIFY_EVENT(e, buffer, l) {
480 if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */
483 if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */
490 /* We close the tty fd here since if the old session ended our handle will be dead. It's important that
491 * we do this after sleeping, so that we don't enter an endless loop. */
499 #if 0 /// UNNEEDED by elogind
500 int release_terminal(void) {
501 static const struct sigaction sa_new = {
502 .sa_handler = SIG_IGN,
503 .sa_flags = SA_RESTART,
506 _cleanup_close_ int fd = -1;
507 struct sigaction sa_old;
510 fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
514 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
515 * by our own TIOCNOTTY */
516 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
518 r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0;
520 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
525 int terminal_vhangup_fd(int fd) {
528 if (ioctl(fd, TIOCVHANGUP) < 0)
534 int terminal_vhangup(const char *name) {
535 _cleanup_close_ int fd;
537 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
541 return terminal_vhangup_fd(fd);
544 int vt_disallocate(const char *name) {
545 _cleanup_close_ int fd = -1;
550 /* Deallocate the VT if possible. If not possible
551 * (i.e. because it is the active one), at least clear it
552 * entirely (including the scrollback buffer) */
554 e = path_startswith(name, "/dev/");
558 if (!tty_is_vc(name)) {
559 /* So this is not a VT. I guess we cannot deallocate
560 * it then. But let's at least clear the screen */
562 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
567 "\033[r" /* clear scrolling region */
568 "\033[H" /* move home */
569 "\033[2J", /* clear screen */
574 n = startswith(e, "tty");
578 r = safe_atou(n, &u);
585 /* Try to deallocate */
586 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
590 r = ioctl(fd, VT_DISALLOCATE, u);
599 /* Couldn't deallocate, so let's clear it fully with
601 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
606 "\033[r" /* clear scrolling region */
607 "\033[H" /* move home */
608 "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */
613 int make_console_stdio(void) {
616 /* Make /dev/console the controlling terminal and stdin/stdout/stderr */
618 fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY);
620 return log_error_errno(fd, "Failed to acquire terminal: %m");
622 r = reset_terminal_fd(fd, true);
624 log_warning_errno(r, "Failed to reset terminal, ignoring: %m");
626 r = rearrange_stdio(fd, fd, fd); /* This invalidates 'fd' both on success and on failure. */
628 return log_error_errno(r, "Failed to make terminal stdin/stdout/stderr: %m");
630 reset_terminal_feature_caches();
636 bool tty_is_vc(const char *tty) {
639 return vtnr_from_tty(tty) >= 0;
642 bool tty_is_console(const char *tty) {
645 return streq(skip_dev_prefix(tty), "console");
648 int vtnr_from_tty(const char *tty) {
653 tty = skip_dev_prefix(tty);
655 if (!startswith(tty, "tty") )
658 if (tty[3] < '0' || tty[3] > '9')
661 r = safe_atoi(tty+3, &i);
671 #if 0 /// UNNEEDED by elogind
672 int resolve_dev_console(char **ret) {
673 _cleanup_free_ char *active = NULL;
679 /* Resolve where /dev/console is pointing to, if /sys is actually ours (i.e. not read-only-mounted which is a
680 * sign for container setups) */
682 if (path_is_read_only_fs("/sys") > 0)
685 r = read_one_line_file("/sys/class/tty/console/active", &active);
689 /* If multiple log outputs are configured the last one is what /dev/console points to */
690 tty = strrchr(active, ' ');
696 if (streq(tty, "tty0")) {
697 active = mfree(active);
699 /* Get the active VC (e.g. tty1) */
700 r = read_one_line_file("/sys/class/tty/tty0/active", &active);
708 *ret = TAKE_PTR(active);
722 int get_kernel_consoles(char ***ret) {
723 _cleanup_strv_free_ char **l = NULL;
724 _cleanup_free_ char *line = NULL;
730 /* If /sys is mounted read-only this means we are running in some kind of container environment. In that
731 * case /sys would reflect the host system, not us, hence ignore the data we can read from it. */
732 if (path_is_read_only_fs("/sys") > 0)
735 r = read_one_line_file("/sys/class/tty/console/active", &line);
741 _cleanup_free_ char *tty = NULL;
744 r = extract_first_word(&p, &tty, NULL, 0);
750 if (streq(tty, "tty0")) {
752 r = read_one_line_file("/sys/class/tty/tty0/active", &tty);
757 path = strappend("/dev/", tty);
761 if (access(path, F_OK) < 0) {
762 log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path);
767 r = strv_consume(&l, path);
772 if (strv_isempty(l)) {
773 log_debug("No devices found for system console");
782 r = strv_extend(&l, "/dev/console");
791 bool tty_is_vc_resolve(const char *tty) {
792 _cleanup_free_ char *resolved = NULL;
796 tty = skip_dev_prefix(tty);
798 if (streq(tty, "console")) {
799 if (resolve_dev_console(&resolved) < 0)
805 return tty_is_vc(tty);
808 const char *default_term_for_tty(const char *tty) {
809 return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220";
813 int fd_columns(int fd) {
814 struct winsize ws = {};
816 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
825 unsigned columns(void) {
829 if (cached_columns > 0)
830 return cached_columns;
833 e = getenv("COLUMNS");
835 (void) safe_atoi(e, &c);
838 c = fd_columns(STDOUT_FILENO);
844 return cached_columns;
847 int fd_lines(int fd) {
848 struct winsize ws = {};
850 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
859 unsigned lines(void) {
863 if (cached_lines > 0)
869 (void) safe_atoi(e, &l);
872 l = fd_lines(STDOUT_FILENO);
881 /* intended to be used as a SIGWINCH sighandler */
882 #if 0 /// UNNEEDED by elogind
883 void columns_lines_cache_reset(int signum) {
889 void reset_terminal_feature_caches(void) {
893 cached_colors_enabled = -1;
894 cached_underline_enabled = -1;
899 if (cached_on_tty < 0)
900 cached_on_tty = isatty(STDOUT_FILENO) > 0;
902 return cached_on_tty;
905 int getttyname_malloc(int fd, char **ret) {
915 r = ttyname_r(fd, path, sizeof(path));
919 c = strdup(skip_dev_prefix(path));
936 int getttyname_harder(int fd, char **r) {
940 k = getttyname_malloc(fd, &s);
944 if (streq(s, "tty")) {
946 return get_ctty(0, NULL, r);
953 int get_ctty_devnr(pid_t pid, dev_t *d) {
955 _cleanup_free_ char *line = NULL;
961 p = procfs_file_alloca(pid, "stat");
962 r = read_one_line_file(p, &line);
966 p = strrchr(line, ')');
981 if (major(ttynr) == 0 && minor(ttynr) == 0)
990 int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
991 char fn[STRLEN("/dev/char/") + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL;
992 _cleanup_free_ char *s = NULL;
999 k = get_ctty_devnr(pid, &devnr);
1003 sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr));
1005 k = readlink_malloc(fn, &s);
1011 /* This is an ugly hack */
1012 if (major(devnr) == 136) {
1013 if (asprintf(&b, "pts/%u", minor(devnr)) < 0)
1016 /* Probably something like the ptys which have no
1017 * symlink in /dev/char. Let's return something
1018 * vaguely useful. */
1025 if (startswith(s, "/dev/"))
1027 else if (startswith(s, "../"))
1044 #if 0 /// UNNEEDED by elogind
1045 int ptsname_malloc(int fd, char **ret) {
1058 if (ptsname_r(fd, c, l) == 0) {
1062 if (errno != ERANGE) {
1072 int ptsname_namespace(int pty, char **ret) {
1075 /* Like ptsname(), but doesn't assume that the path is
1076 * accessible in the local namespace. */
1078 r = ioctl(pty, TIOCGPTN, &no);
1085 if (asprintf(ret, "/dev/pts/%i", no) < 0)
1091 int openpt_in_namespace(pid_t pid, int flags) {
1092 _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1;
1093 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1099 r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd);
1103 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
1106 r = safe_fork("(sd-openpt)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child);
1112 pair[0] = safe_close(pair[0]);
1114 r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd);
1116 _exit(EXIT_FAILURE);
1118 master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC);
1120 _exit(EXIT_FAILURE);
1122 if (unlockpt(master) < 0)
1123 _exit(EXIT_FAILURE);
1125 if (send_one_fd(pair[1], master, 0) < 0)
1126 _exit(EXIT_FAILURE);
1128 _exit(EXIT_SUCCESS);
1131 pair[1] = safe_close(pair[1]);
1133 r = wait_for_terminate_and_check("(sd-openpt)", child, 0);
1136 if (r != EXIT_SUCCESS)
1139 return receive_one_fd(pair[0], 0);
1142 int open_terminal_in_namespace(pid_t pid, const char *name, int mode) {
1143 _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1;
1144 _cleanup_close_pair_ int pair[2] = { -1, -1 };
1148 r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd);
1152 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
1155 r = safe_fork("(sd-terminal)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child);
1161 pair[0] = safe_close(pair[0]);
1163 r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd);
1165 _exit(EXIT_FAILURE);
1167 master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC);
1169 _exit(EXIT_FAILURE);
1171 if (send_one_fd(pair[1], master, 0) < 0)
1172 _exit(EXIT_FAILURE);
1174 _exit(EXIT_SUCCESS);
1177 pair[1] = safe_close(pair[1]);
1179 r = wait_for_terminate_and_check("(sd-terminal)", child, 0);
1182 if (r != EXIT_SUCCESS)
1185 return receive_one_fd(pair[0], 0);
1189 static bool getenv_terminal_is_dumb(void) {
1196 return streq(e, "dumb");
1199 bool terminal_is_dumb(void) {
1203 return getenv_terminal_is_dumb();
1206 bool colors_enabled(void) {
1208 /* Returns true if colors are considered supported on our stdout. For that we check $SYSTEMD_COLORS first
1209 * (which is the explicit way to turn colors on/off). If that didn't work we turn colors off unless we are on a
1210 * 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
1211 * we are PID 1 then we do not check whether we are connected to a TTY, because we don't keep /dev/console open
1212 * continously due to fear of SAK, and hence things are a bit weird. */
1214 if (cached_colors_enabled < 0) {
1215 #if 0 /// elogind does not allow such forcing, and we are never init!
1218 val = getenv_bool("SYSTEMD_COLORS");
1220 cached_colors_enabled = val;
1221 else if (getpid_cached() == 1)
1222 /* PID1 outputs to the console without holding it open all the time */
1223 cached_colors_enabled = !getenv_terminal_is_dumb();
1226 cached_colors_enabled = !terminal_is_dumb();
1229 return cached_colors_enabled;
1232 #if 0 /// UNNEEDED by elogind
1233 bool dev_console_colors_enabled(void) {
1234 _cleanup_free_ char *s = NULL;
1237 /* Returns true if we assume that color is supported on /dev/console.
1239 * For that we first check if we explicitly got told to use colors or not, by checking $SYSTEMD_COLORS. If that
1240 * isn't set we check whether PID 1 has $TERM set, and if not, whether TERM is set on the kernel command
1241 * line. If we find $TERM set we assume color if it's not set to "dumb", similarly to how regular
1242 * colors_enabled() operates. */
1244 b = getenv_bool("SYSTEMD_COLORS");
1248 if (getenv_for_pid(1, "TERM", &s) <= 0)
1249 (void) proc_cmdline_get_key("TERM", 0, &s);
1251 return !streq_ptr(s, "dumb");
1255 bool underline_enabled(void) {
1257 if (cached_underline_enabled < 0) {
1259 /* The Linux console doesn't support underlining, turn it off, but only there. */
1261 if (colors_enabled())
1262 cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux");
1264 cached_underline_enabled = false;
1267 return cached_underline_enabled;
1270 int vt_default_utf8(void) {
1271 _cleanup_free_ char *b = NULL;
1274 /* Read the default VT UTF8 setting from the kernel */
1276 r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b);
1280 return parse_boolean(b);
1283 int vt_reset_keyboard(int fd) {
1286 /* If we can't read the default, then default to unicode. It's 2017 after all. */
1287 kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE;
1289 if (ioctl(fd, KDSKBMODE, kb) < 0)
1295 static bool urlify_enabled(void) {
1296 static int cached_urlify_enabled = -1;
1298 /* Unfortunately 'less' doesn't support links like this yet ðŸ˜, hence let's disable this as long as there's a
1299 * pager in effect. Let's drop this check as soon as less got fixed a and enough time passed so that it's safe
1300 * to assume that a link-enabled 'less' version has hit most installations. */
1302 if (cached_urlify_enabled < 0) {
1305 val = getenv_bool("SYSTEMD_URLIFY");
1307 cached_urlify_enabled = val;
1309 cached_urlify_enabled = colors_enabled() && !pager_have();
1312 return cached_urlify_enabled;
1315 int terminal_urlify(const char *url, const char *text, char **ret) {
1320 /* Takes an URL and a pretty string and formats it as clickable link for the terminal. See
1321 * https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda for details. */
1326 if (urlify_enabled())
1327 n = strjoin("\x1B]8;;", url, "\a", text, "\x1B]8;;\a");
1337 int terminal_urlify_path(const char *path, const char *text, char **ret) {
1338 _cleanup_free_ char *absolute = NULL;
1345 /* Much like terminal_urlify() above, but takes a file system path as input
1346 * and turns it into a proper file:// URL first. */
1354 if (!urlify_enabled()) {
1368 if (!path_is_absolute(path)) {
1369 r = path_make_absolute_cwd(path, &absolute);
1376 /* As suggested by https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda, let's include the local
1377 * hostname here. Note that we don't use gethostname_malloc() or gethostname_strict() since we are interested
1378 * in the raw string the kernel has set, whatever it may be, under the assumption that terminals are not overly
1379 * careful with validating the strings either. */
1381 url = strjoina("file://", u.nodename, path);
1383 return terminal_urlify(url, text, ret);
1386 static int cat_file(const char *filename, bool newline) {
1387 _cleanup_close_ int fd;
1389 fd = open(filename, O_RDONLY|O_CLOEXEC|O_NOCTTY);
1393 printf("%s%s# %s%s\n",
1394 newline ? "\n" : "",
1395 ansi_highlight_blue(),
1400 return copy_bytes(fd, STDOUT_FILENO, (uint64_t) -1, 0);
1403 int cat_files(const char *file, char **dropins) {
1408 r = cat_file(file, false);
1410 return log_warning_errno(r, "Failed to cat %s: %m", file);
1413 STRV_FOREACH(path, dropins) {
1414 r = cat_file(*path, file || path != dropins);
1416 return log_warning_errno(r, "Failed to cat %s: %m", *path);