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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
288a74cc RC |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
11c3a366 | 21 | #include <errno.h> |
07630cea | 22 | #include <fcntl.h> |
11c3a366 TA |
23 | #include <limits.h> |
24 | #include <stdarg.h> | |
25 | #include <stddef.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/inotify.h> | |
29 | #include <sys/socket.h> | |
30 | #include <sys/sysmacros.h> | |
31 | #include <sys/time.h> | |
07630cea LP |
32 | #include <linux/kd.h> |
33 | #include <linux/tiocl.h> | |
34 | #include <linux/vt.h> | |
35 | #include <poll.h> | |
36 | #include <signal.h> | |
288a74cc | 37 | #include <sys/ioctl.h> |
07630cea | 38 | #include <sys/types.h> |
288a74cc | 39 | #include <termios.h> |
07630cea | 40 | #include <unistd.h> |
288a74cc | 41 | |
b5efdb8a | 42 | #include "alloc-util.h" |
acf553b0 | 43 | #include "env-util.h" |
3ffd4af2 | 44 | #include "fd-util.h" |
288a74cc | 45 | #include "fileio.h" |
f4f15635 | 46 | #include "fs-util.h" |
c004493c | 47 | #include "io-util.h" |
93cc7779 TA |
48 | #include "log.h" |
49 | #include "macro.h" | |
6bedfcbb | 50 | #include "parse-util.h" |
07630cea | 51 | #include "process-util.h" |
2583fbea | 52 | #include "socket-util.h" |
8fcde012 | 53 | #include "stat-util.h" |
07630cea | 54 | #include "string-util.h" |
6af62124 | 55 | #include "strv.h" |
3ffd4af2 | 56 | #include "terminal-util.h" |
07630cea LP |
57 | #include "time-util.h" |
58 | #include "util.h" | |
27458ed6 | 59 | #include "path-util.h" |
288a74cc RC |
60 | |
61 | static volatile unsigned cached_columns = 0; | |
62 | static volatile unsigned cached_lines = 0; | |
63 | ||
c6063244 LP |
64 | static volatile int cached_on_tty = -1; |
65 | static volatile int cached_colors_enabled = -1; | |
66 | static volatile int cached_underline_enabled = -1; | |
67 | ||
288a74cc RC |
68 | int chvt(int vt) { |
69 | _cleanup_close_ int fd; | |
70 | ||
0a8b555c | 71 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
72 | if (fd < 0) |
73 | return -errno; | |
74 | ||
b9e74c39 | 75 | if (vt <= 0) { |
288a74cc RC |
76 | int tiocl[2] = { |
77 | TIOCL_GETKMSGREDIRECT, | |
78 | 0 | |
79 | }; | |
80 | ||
81 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
82 | return -errno; | |
83 | ||
84 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
85 | } | |
86 | ||
87 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
88 | return -errno; | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
94 | struct termios old_termios, new_termios; | |
95 | char c, line[LINE_MAX]; | |
96 | ||
97 | assert(f); | |
98 | assert(ret); | |
99 | ||
100 | if (tcgetattr(fileno(f), &old_termios) >= 0) { | |
101 | new_termios = old_termios; | |
102 | ||
103 | new_termios.c_lflag &= ~ICANON; | |
104 | new_termios.c_cc[VMIN] = 1; | |
105 | new_termios.c_cc[VTIME] = 0; | |
106 | ||
107 | if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { | |
108 | size_t k; | |
109 | ||
110 | if (t != USEC_INFINITY) { | |
111 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { | |
112 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
113 | return -ETIMEDOUT; | |
114 | } | |
115 | } | |
116 | ||
117 | k = fread(&c, 1, 1, f); | |
118 | ||
119 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
120 | ||
121 | if (k <= 0) | |
122 | return -EIO; | |
123 | ||
124 | if (need_nl) | |
125 | *need_nl = c != '\n'; | |
126 | ||
127 | *ret = c; | |
128 | return 0; | |
129 | } | |
130 | } | |
131 | ||
132 | if (t != USEC_INFINITY) { | |
133 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) | |
134 | return -ETIMEDOUT; | |
135 | } | |
136 | ||
137 | errno = 0; | |
138 | if (!fgets(line, sizeof(line), f)) | |
f5e5c28f | 139 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
140 | |
141 | truncate_nl(line); | |
142 | ||
143 | if (strlen(line) != 1) | |
144 | return -EBADMSG; | |
145 | ||
146 | if (need_nl) | |
147 | *need_nl = false; | |
148 | ||
149 | *ret = line[0]; | |
150 | return 0; | |
151 | } | |
152 | ||
3c670f89 FB |
153 | #define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC) |
154 | ||
155 | int ask_char(char *ret, const char *replies, const char *fmt, ...) { | |
288a74cc RC |
156 | int r; |
157 | ||
158 | assert(ret); | |
159 | assert(replies); | |
3c670f89 | 160 | assert(fmt); |
288a74cc RC |
161 | |
162 | for (;;) { | |
163 | va_list ap; | |
164 | char c; | |
165 | bool need_nl = true; | |
166 | ||
7565bb98 | 167 | if (colors_enabled()) |
1fc464f6 | 168 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc | 169 | |
3c670f89 FB |
170 | putchar('\r'); |
171 | ||
172 | va_start(ap, fmt); | |
173 | vprintf(fmt, ap); | |
288a74cc RC |
174 | va_end(ap); |
175 | ||
7565bb98 | 176 | if (colors_enabled()) |
1fc464f6 | 177 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
178 | |
179 | fflush(stdout); | |
180 | ||
3c670f89 | 181 | r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl); |
288a74cc RC |
182 | if (r < 0) { |
183 | ||
3c670f89 FB |
184 | if (r == -ETIMEDOUT) |
185 | continue; | |
186 | ||
288a74cc RC |
187 | if (r == -EBADMSG) { |
188 | puts("Bad input, please try again."); | |
189 | continue; | |
190 | } | |
191 | ||
192 | putchar('\n'); | |
193 | return r; | |
194 | } | |
195 | ||
196 | if (need_nl) | |
197 | putchar('\n'); | |
198 | ||
199 | if (strchr(replies, c)) { | |
200 | *ret = c; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | puts("Read unexpected character, please try again."); | |
205 | } | |
206 | } | |
207 | ||
208 | int ask_string(char **ret, const char *text, ...) { | |
209 | assert(ret); | |
210 | assert(text); | |
211 | ||
212 | for (;;) { | |
213 | char line[LINE_MAX]; | |
214 | va_list ap; | |
215 | ||
7565bb98 | 216 | if (colors_enabled()) |
1fc464f6 | 217 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
218 | |
219 | va_start(ap, text); | |
220 | vprintf(text, ap); | |
221 | va_end(ap); | |
222 | ||
7565bb98 | 223 | if (colors_enabled()) |
1fc464f6 | 224 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
225 | |
226 | fflush(stdout); | |
227 | ||
228 | errno = 0; | |
229 | if (!fgets(line, sizeof(line), stdin)) | |
f5e5c28f | 230 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
231 | |
232 | if (!endswith(line, "\n")) | |
233 | putchar('\n'); | |
234 | else { | |
235 | char *s; | |
236 | ||
237 | if (isempty(line)) | |
238 | continue; | |
239 | ||
240 | truncate_nl(line); | |
241 | s = strdup(line); | |
242 | if (!s) | |
243 | return -ENOMEM; | |
244 | ||
245 | *ret = s; | |
246 | return 0; | |
247 | } | |
248 | } | |
249 | } | |
250 | ||
251 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
252 | struct termios termios; | |
253 | int r = 0; | |
254 | ||
255 | /* Set terminal to some sane defaults */ | |
256 | ||
257 | assert(fd >= 0); | |
258 | ||
259 | /* We leave locked terminal attributes untouched, so that | |
260 | * Plymouth may set whatever it wants to set, and we don't | |
261 | * interfere with that. */ | |
262 | ||
263 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 264 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
265 | |
266 | /* Switch to text mode */ | |
267 | if (switch_to_text) | |
7d927c9a | 268 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc | 269 | |
73e669e0 | 270 | /* Set default keyboard mode */ |
c83f349c | 271 | (void) vt_reset_keyboard(fd); |
288a74cc RC |
272 | |
273 | if (tcgetattr(fd, &termios) < 0) { | |
274 | r = -errno; | |
275 | goto finish; | |
276 | } | |
277 | ||
278 | /* We only reset the stuff that matters to the software. How | |
279 | * hardware is set up we don't touch assuming that somebody | |
280 | * else will do that for us */ | |
281 | ||
282 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
283 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
284 | termios.c_oflag |= ONLCR; | |
285 | termios.c_cflag |= CREAD; | |
286 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
287 | ||
288 | termios.c_cc[VINTR] = 03; /* ^C */ | |
289 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
290 | termios.c_cc[VERASE] = 0177; | |
291 | termios.c_cc[VKILL] = 025; /* ^X */ | |
292 | termios.c_cc[VEOF] = 04; /* ^D */ | |
293 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
294 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
295 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
296 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
297 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
298 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
299 | termios.c_cc[VEOL] = 0; | |
300 | termios.c_cc[VEOL2] = 0; | |
301 | ||
302 | termios.c_cc[VTIME] = 0; | |
303 | termios.c_cc[VMIN] = 1; | |
304 | ||
305 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
306 | r = -errno; | |
307 | ||
308 | finish: | |
309 | /* Just in case, flush all crap out */ | |
7d927c9a | 310 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
311 | |
312 | return r; | |
313 | } | |
314 | ||
315 | int reset_terminal(const char *name) { | |
316 | _cleanup_close_ int fd = -1; | |
317 | ||
0a8b555c LP |
318 | /* We open the terminal with O_NONBLOCK here, to ensure we |
319 | * don't block on carrier if this is a terminal with carrier | |
320 | * configured. */ | |
321 | ||
322 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
323 | if (fd < 0) |
324 | return fd; | |
325 | ||
326 | return reset_terminal_fd(fd, true); | |
327 | } | |
328 | ||
329 | int open_terminal(const char *name, int mode) { | |
288a74cc | 330 | unsigned c = 0; |
87964ec7 | 331 | int fd; |
288a74cc RC |
332 | |
333 | /* | |
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. | |
338 | * | |
339 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
340 | */ | |
341 | ||
35bdab77 LP |
342 | if (mode & O_CREAT) |
343 | return -EINVAL; | |
288a74cc RC |
344 | |
345 | for (;;) { | |
346 | fd = open(name, mode, 0); | |
347 | if (fd >= 0) | |
348 | break; | |
349 | ||
350 | if (errno != EIO) | |
351 | return -errno; | |
352 | ||
353 | /* Max 1s in total */ | |
354 | if (c >= 20) | |
355 | return -errno; | |
356 | ||
357 | usleep(50 * USEC_PER_MSEC); | |
358 | c++; | |
359 | } | |
360 | ||
87964ec7 | 361 | if (isatty(fd) <= 0) { |
288a74cc RC |
362 | safe_close(fd); |
363 | return -ENOTTY; | |
364 | } | |
365 | ||
366 | return fd; | |
367 | } | |
368 | ||
369 | int acquire_terminal( | |
370 | const char *name, | |
8854d795 | 371 | AcquireTerminalFlags flags, |
288a74cc RC |
372 | usec_t timeout) { |
373 | ||
8854d795 LP |
374 | _cleanup_close_ int notify = -1, fd = -1; |
375 | usec_t ts = USEC_INFINITY; | |
376 | int r, wd = -1; | |
288a74cc RC |
377 | |
378 | assert(name); | |
8854d795 | 379 | assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT)); |
288a74cc | 380 | |
8854d795 LP |
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. | |
288a74cc | 383 | * |
8854d795 LP |
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 | |
387 | * not configure any service on the same tty as an untrusted user this should not be a problem. (Which he | |
388 | * probably should not do anyway.) */ | |
389 | ||
390 | if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) { | |
288a74cc | 391 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); |
8854d795 LP |
392 | if (notify < 0) |
393 | return -errno; | |
288a74cc RC |
394 | |
395 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
8854d795 LP |
396 | if (wd < 0) |
397 | return -errno; | |
398 | ||
399 | if (timeout != USEC_INFINITY) | |
400 | ts = now(CLOCK_MONOTONIC); | |
288a74cc RC |
401 | } |
402 | ||
403 | for (;;) { | |
404 | struct sigaction sa_old, sa_new = { | |
405 | .sa_handler = SIG_IGN, | |
406 | .sa_flags = SA_RESTART, | |
407 | }; | |
408 | ||
409 | if (notify >= 0) { | |
410 | r = flush_fd(notify); | |
411 | if (r < 0) | |
8854d795 | 412 | return r; |
288a74cc RC |
413 | } |
414 | ||
8854d795 LP |
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 */ | |
288a74cc RC |
417 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); |
418 | if (fd < 0) | |
419 | return fd; | |
420 | ||
8854d795 | 421 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */ |
288a74cc RC |
422 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); |
423 | ||
424 | /* First, try to get the tty */ | |
8854d795 LP |
425 | r = ioctl(fd, TIOCSCTTY, |
426 | (flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0; | |
288a74cc | 427 | |
8854d795 | 428 | /* Reset signal handler to old value */ |
288a74cc RC |
429 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); |
430 | ||
8854d795 LP |
431 | /* Success? Exit the loop now! */ |
432 | if (r >= 0) | |
433 | break; | |
288a74cc | 434 | |
8854d795 LP |
435 | /* Any failure besides -EPERM? Fail, regardless of the mode. */ |
436 | if (r != -EPERM) | |
437 | return r; | |
288a74cc | 438 | |
8854d795 LP |
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. */ | |
288a74cc RC |
442 | break; |
443 | ||
8854d795 LP |
444 | if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */ |
445 | return r; | |
446 | ||
288a74cc | 447 | assert(notify >= 0); |
8854d795 | 448 | assert(wd >= 0); |
288a74cc RC |
449 | |
450 | for (;;) { | |
451 | union inotify_event_buffer buffer; | |
452 | struct inotify_event *e; | |
453 | ssize_t l; | |
454 | ||
455 | if (timeout != USEC_INFINITY) { | |
456 | usec_t n; | |
457 | ||
8854d795 LP |
458 | assert(ts != USEC_INFINITY); |
459 | ||
288a74cc | 460 | n = now(CLOCK_MONOTONIC); |
8854d795 LP |
461 | if (ts + timeout < n) |
462 | return -ETIMEDOUT; | |
288a74cc | 463 | |
f80da6f3 | 464 | r = fd_wait_for_event(notify, POLLIN, ts + timeout - n); |
288a74cc | 465 | if (r < 0) |
8854d795 LP |
466 | return r; |
467 | if (r == 0) | |
468 | return -ETIMEDOUT; | |
288a74cc RC |
469 | } |
470 | ||
471 | l = read(notify, &buffer, sizeof(buffer)); | |
472 | if (l < 0) { | |
3742095b | 473 | if (IN_SET(errno, EINTR, EAGAIN)) |
288a74cc RC |
474 | continue; |
475 | ||
8854d795 | 476 | return -errno; |
288a74cc RC |
477 | } |
478 | ||
479 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
8854d795 LP |
480 | if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */ |
481 | break; | |
482 | ||
483 | if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */ | |
484 | return -EIO; | |
288a74cc RC |
485 | } |
486 | ||
487 | break; | |
488 | } | |
489 | ||
8854d795 LP |
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. */ | |
288a74cc RC |
492 | fd = safe_close(fd); |
493 | } | |
494 | ||
8854d795 LP |
495 | r = fd; |
496 | fd = -1; | |
288a74cc RC |
497 | |
498 | return r; | |
499 | } | |
500 | ||
501 | int release_terminal(void) { | |
502 | static const struct sigaction sa_new = { | |
503 | .sa_handler = SIG_IGN, | |
504 | .sa_flags = SA_RESTART, | |
505 | }; | |
506 | ||
507 | _cleanup_close_ int fd = -1; | |
508 | struct sigaction sa_old; | |
87964ec7 | 509 | int r; |
288a74cc | 510 | |
0a8b555c | 511 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
512 | if (fd < 0) |
513 | return -errno; | |
514 | ||
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); | |
518 | ||
87964ec7 | 519 | r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0; |
288a74cc RC |
520 | |
521 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
522 | ||
523 | return r; | |
524 | } | |
525 | ||
526 | int terminal_vhangup_fd(int fd) { | |
527 | assert(fd >= 0); | |
528 | ||
529 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
530 | return -errno; | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
535 | int terminal_vhangup(const char *name) { | |
536 | _cleanup_close_ int fd; | |
537 | ||
0a8b555c | 538 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
539 | if (fd < 0) |
540 | return fd; | |
541 | ||
542 | return terminal_vhangup_fd(fd); | |
543 | } | |
544 | ||
545 | int vt_disallocate(const char *name) { | |
1ba23931 | 546 | _cleanup_close_ int fd = -1; |
27458ed6 | 547 | const char *e, *n; |
288a74cc | 548 | unsigned u; |
1ba23931 | 549 | int r; |
288a74cc RC |
550 | |
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) */ | |
554 | ||
27458ed6 LP |
555 | e = path_startswith(name, "/dev/"); |
556 | if (!e) | |
288a74cc RC |
557 | return -EINVAL; |
558 | ||
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 */ | |
562 | ||
563 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
564 | if (fd < 0) | |
565 | return fd; | |
566 | ||
567 | loop_write(fd, | |
568 | "\033[r" /* clear scrolling region */ | |
569 | "\033[H" /* move home */ | |
570 | "\033[2J", /* clear screen */ | |
571 | 10, false); | |
288a74cc RC |
572 | return 0; |
573 | } | |
574 | ||
27458ed6 LP |
575 | n = startswith(e, "tty"); |
576 | if (!n) | |
288a74cc RC |
577 | return -EINVAL; |
578 | ||
27458ed6 | 579 | r = safe_atou(n, &u); |
288a74cc RC |
580 | if (r < 0) |
581 | return r; | |
582 | ||
583 | if (u <= 0) | |
584 | return -EINVAL; | |
585 | ||
586 | /* Try to deallocate */ | |
0a8b555c | 587 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
588 | if (fd < 0) |
589 | return fd; | |
590 | ||
591 | r = ioctl(fd, VT_DISALLOCATE, u); | |
1ba23931 | 592 | fd = safe_close(fd); |
288a74cc RC |
593 | |
594 | if (r >= 0) | |
595 | return 0; | |
596 | ||
597 | if (errno != EBUSY) | |
598 | return -errno; | |
599 | ||
600 | /* Couldn't deallocate, so let's clear it fully with | |
601 | * scrollback */ | |
602 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
603 | if (fd < 0) | |
604 | return fd; | |
605 | ||
606 | loop_write(fd, | |
607 | "\033[r" /* clear scrolling region */ | |
608 | "\033[H" /* move home */ | |
609 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
610 | 10, false); | |
288a74cc RC |
611 | return 0; |
612 | } | |
613 | ||
288a74cc RC |
614 | int make_console_stdio(void) { |
615 | int fd, r; | |
616 | ||
617 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
618 | ||
8854d795 | 619 | fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY); |
288a74cc RC |
620 | if (fd < 0) |
621 | return log_error_errno(fd, "Failed to acquire terminal: %m"); | |
622 | ||
3d18b167 LP |
623 | r = reset_terminal_fd(fd, true); |
624 | if (r < 0) | |
625 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
626 | ||
288a74cc RC |
627 | r = make_stdio(fd); |
628 | if (r < 0) | |
629 | return log_error_errno(r, "Failed to duplicate terminal fd: %m"); | |
630 | ||
c6063244 LP |
631 | reset_terminal_feature_caches(); |
632 | ||
288a74cc RC |
633 | return 0; |
634 | } | |
635 | ||
288a74cc RC |
636 | bool tty_is_vc(const char *tty) { |
637 | assert(tty); | |
638 | ||
639 | return vtnr_from_tty(tty) >= 0; | |
640 | } | |
641 | ||
642 | bool tty_is_console(const char *tty) { | |
643 | assert(tty); | |
644 | ||
a119ec7c | 645 | return streq(skip_dev_prefix(tty), "console"); |
288a74cc RC |
646 | } |
647 | ||
648 | int vtnr_from_tty(const char *tty) { | |
649 | int i, r; | |
650 | ||
651 | assert(tty); | |
652 | ||
a119ec7c | 653 | tty = skip_dev_prefix(tty); |
288a74cc RC |
654 | |
655 | if (!startswith(tty, "tty") ) | |
656 | return -EINVAL; | |
657 | ||
658 | if (tty[3] < '0' || tty[3] > '9') | |
659 | return -EINVAL; | |
660 | ||
661 | r = safe_atoi(tty+3, &i); | |
662 | if (r < 0) | |
663 | return r; | |
664 | ||
665 | if (i < 0 || i > 63) | |
666 | return -EINVAL; | |
667 | ||
668 | return i; | |
669 | } | |
670 | ||
671 | char *resolve_dev_console(char **active) { | |
672 | char *tty; | |
673 | ||
674 | /* Resolve where /dev/console is pointing to, if /sys is actually ours | |
675 | * (i.e. not read-only-mounted which is a sign for container setups) */ | |
676 | ||
677 | if (path_is_read_only_fs("/sys") > 0) | |
678 | return NULL; | |
679 | ||
680 | if (read_one_line_file("/sys/class/tty/console/active", active) < 0) | |
681 | return NULL; | |
682 | ||
683 | /* If multiple log outputs are configured the last one is what | |
684 | * /dev/console points to */ | |
685 | tty = strrchr(*active, ' '); | |
686 | if (tty) | |
687 | tty++; | |
688 | else | |
689 | tty = *active; | |
690 | ||
691 | if (streq(tty, "tty0")) { | |
692 | char *tmp; | |
693 | ||
694 | /* Get the active VC (e.g. tty1) */ | |
695 | if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) { | |
696 | free(*active); | |
697 | tty = *active = tmp; | |
698 | } | |
699 | } | |
700 | ||
701 | return tty; | |
702 | } | |
703 | ||
6af62124 WF |
704 | int get_kernel_consoles(char ***consoles) { |
705 | _cleanup_strv_free_ char **con = NULL; | |
706 | _cleanup_free_ char *line = NULL; | |
707 | const char *active; | |
708 | int r; | |
709 | ||
710 | assert(consoles); | |
711 | ||
712 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
713 | if (r < 0) | |
714 | return r; | |
715 | ||
716 | active = line; | |
717 | for (;;) { | |
718 | _cleanup_free_ char *tty = NULL; | |
719 | char *path; | |
720 | ||
721 | r = extract_first_word(&active, &tty, NULL, 0); | |
722 | if (r < 0) | |
723 | return r; | |
724 | if (r == 0) | |
725 | break; | |
726 | ||
727 | if (streq(tty, "tty0")) { | |
728 | tty = mfree(tty); | |
729 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
730 | if (r < 0) | |
731 | return r; | |
732 | } | |
733 | ||
734 | path = strappend("/dev/", tty); | |
735 | if (!path) | |
736 | return -ENOMEM; | |
737 | ||
738 | if (access(path, F_OK) < 0) { | |
739 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
740 | free(path); | |
741 | continue; | |
742 | } | |
743 | ||
744 | r = strv_consume(&con, path); | |
745 | if (r < 0) | |
746 | return r; | |
747 | } | |
748 | ||
749 | if (strv_isempty(con)) { | |
750 | log_debug("No devices found for system console"); | |
751 | ||
752 | r = strv_extend(&con, "/dev/console"); | |
753 | if (r < 0) | |
754 | return r; | |
755 | } | |
756 | ||
757 | *consoles = con; | |
758 | con = NULL; | |
759 | return 0; | |
760 | } | |
761 | ||
288a74cc RC |
762 | bool tty_is_vc_resolve(const char *tty) { |
763 | _cleanup_free_ char *active = NULL; | |
764 | ||
765 | assert(tty); | |
766 | ||
a119ec7c | 767 | tty = skip_dev_prefix(tty); |
288a74cc RC |
768 | |
769 | if (streq(tty, "console")) { | |
770 | tty = resolve_dev_console(&active); | |
771 | if (!tty) | |
772 | return false; | |
773 | } | |
774 | ||
775 | return tty_is_vc(tty); | |
776 | } | |
777 | ||
778 | const char *default_term_for_tty(const char *tty) { | |
6af760f3 | 779 | return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220"; |
288a74cc RC |
780 | } |
781 | ||
782 | int fd_columns(int fd) { | |
783 | struct winsize ws = {}; | |
784 | ||
785 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
786 | return -errno; | |
787 | ||
788 | if (ws.ws_col <= 0) | |
789 | return -EIO; | |
790 | ||
791 | return ws.ws_col; | |
792 | } | |
793 | ||
794 | unsigned columns(void) { | |
795 | const char *e; | |
796 | int c; | |
797 | ||
c6063244 | 798 | if (cached_columns > 0) |
288a74cc RC |
799 | return cached_columns; |
800 | ||
801 | c = 0; | |
802 | e = getenv("COLUMNS"); | |
803 | if (e) | |
804 | (void) safe_atoi(e, &c); | |
805 | ||
806 | if (c <= 0) | |
807 | c = fd_columns(STDOUT_FILENO); | |
808 | ||
809 | if (c <= 0) | |
810 | c = 80; | |
811 | ||
812 | cached_columns = c; | |
813 | return cached_columns; | |
814 | } | |
815 | ||
816 | int fd_lines(int fd) { | |
817 | struct winsize ws = {}; | |
818 | ||
819 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
820 | return -errno; | |
821 | ||
822 | if (ws.ws_row <= 0) | |
823 | return -EIO; | |
824 | ||
825 | return ws.ws_row; | |
826 | } | |
827 | ||
828 | unsigned lines(void) { | |
829 | const char *e; | |
830 | int l; | |
831 | ||
c6063244 | 832 | if (cached_lines > 0) |
288a74cc RC |
833 | return cached_lines; |
834 | ||
835 | l = 0; | |
836 | e = getenv("LINES"); | |
837 | if (e) | |
838 | (void) safe_atoi(e, &l); | |
839 | ||
840 | if (l <= 0) | |
841 | l = fd_lines(STDOUT_FILENO); | |
842 | ||
843 | if (l <= 0) | |
844 | l = 24; | |
845 | ||
846 | cached_lines = l; | |
847 | return cached_lines; | |
848 | } | |
849 | ||
850 | /* intended to be used as a SIGWINCH sighandler */ | |
851 | void columns_lines_cache_reset(int signum) { | |
852 | cached_columns = 0; | |
853 | cached_lines = 0; | |
854 | } | |
855 | ||
c6063244 LP |
856 | void reset_terminal_feature_caches(void) { |
857 | cached_columns = 0; | |
858 | cached_lines = 0; | |
859 | ||
860 | cached_colors_enabled = -1; | |
861 | cached_underline_enabled = -1; | |
862 | cached_on_tty = -1; | |
863 | } | |
288a74cc | 864 | |
c6063244 LP |
865 | bool on_tty(void) { |
866 | if (cached_on_tty < 0) | |
288a74cc RC |
867 | cached_on_tty = isatty(STDOUT_FILENO) > 0; |
868 | ||
869 | return cached_on_tty; | |
870 | } | |
871 | ||
872 | int make_stdio(int fd) { | |
395195bb | 873 | int r = 0; |
288a74cc RC |
874 | |
875 | assert(fd >= 0); | |
876 | ||
c6063244 | 877 | if (dup2(fd, STDIN_FILENO) < 0) |
395195bb LP |
878 | r = -errno; |
879 | if (dup2(fd, STDOUT_FILENO) < 0 && r >= 0) | |
880 | r = -errno; | |
881 | if (dup2(fd, STDERR_FILENO) < 0 && r >= 0) | |
882 | r = -errno; | |
288a74cc RC |
883 | |
884 | if (fd >= 3) | |
885 | safe_close(fd); | |
886 | ||
395195bb | 887 | /* Explicitly unset O_CLOEXEC, since if fd was < 3, then dup2() was a NOP and the bit hence possibly set. */ |
913f38e4 | 888 | stdio_unset_cloexec(); |
288a74cc | 889 | |
395195bb | 890 | return r; |
288a74cc RC |
891 | } |
892 | ||
893 | int make_null_stdio(void) { | |
c6063244 | 894 | int null_fd, r; |
288a74cc | 895 | |
d8caff6d | 896 | null_fd = open("/dev/null", O_RDWR|O_NOCTTY|O_CLOEXEC); |
288a74cc RC |
897 | if (null_fd < 0) |
898 | return -errno; | |
899 | ||
c6063244 LP |
900 | r = make_stdio(null_fd); |
901 | ||
902 | reset_terminal_feature_caches(); | |
903 | ||
904 | return r; | |
288a74cc RC |
905 | } |
906 | ||
907 | int getttyname_malloc(int fd, char **ret) { | |
908 | size_t l = 100; | |
909 | int r; | |
910 | ||
911 | assert(fd >= 0); | |
912 | assert(ret); | |
913 | ||
914 | for (;;) { | |
915 | char path[l]; | |
916 | ||
917 | r = ttyname_r(fd, path, sizeof(path)); | |
918 | if (r == 0) { | |
288a74cc RC |
919 | char *c; |
920 | ||
a119ec7c | 921 | c = strdup(skip_dev_prefix(path)); |
288a74cc RC |
922 | if (!c) |
923 | return -ENOMEM; | |
924 | ||
925 | *ret = c; | |
926 | return 0; | |
927 | } | |
928 | ||
929 | if (r != ERANGE) | |
930 | return -r; | |
931 | ||
932 | l *= 2; | |
933 | } | |
934 | ||
935 | return 0; | |
936 | } | |
937 | ||
938 | int getttyname_harder(int fd, char **r) { | |
939 | int k; | |
940 | char *s = NULL; | |
941 | ||
942 | k = getttyname_malloc(fd, &s); | |
943 | if (k < 0) | |
944 | return k; | |
945 | ||
946 | if (streq(s, "tty")) { | |
947 | free(s); | |
948 | return get_ctty(0, NULL, r); | |
949 | } | |
950 | ||
951 | *r = s; | |
952 | return 0; | |
953 | } | |
954 | ||
955 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
956 | int r; | |
957 | _cleanup_free_ char *line = NULL; | |
958 | const char *p; | |
959 | unsigned long ttynr; | |
960 | ||
961 | assert(pid >= 0); | |
962 | ||
963 | p = procfs_file_alloca(pid, "stat"); | |
964 | r = read_one_line_file(p, &line); | |
965 | if (r < 0) | |
966 | return r; | |
967 | ||
968 | p = strrchr(line, ')'); | |
969 | if (!p) | |
970 | return -EIO; | |
971 | ||
972 | p++; | |
973 | ||
974 | if (sscanf(p, " " | |
975 | "%*c " /* state */ | |
976 | "%*d " /* ppid */ | |
977 | "%*d " /* pgrp */ | |
978 | "%*d " /* session */ | |
979 | "%lu ", /* ttynr */ | |
980 | &ttynr) != 1) | |
981 | return -EIO; | |
982 | ||
983 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 984 | return -ENXIO; |
288a74cc RC |
985 | |
986 | if (d) | |
987 | *d = (dev_t) ttynr; | |
988 | ||
989 | return 0; | |
990 | } | |
991 | ||
992 | int get_ctty(pid_t pid, dev_t *_devnr, char **r) { | |
fbd0b64f | 993 | char fn[STRLEN("/dev/char/") + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL; |
288a74cc RC |
994 | _cleanup_free_ char *s = NULL; |
995 | const char *p; | |
996 | dev_t devnr; | |
997 | int k; | |
998 | ||
999 | assert(r); | |
1000 | ||
1001 | k = get_ctty_devnr(pid, &devnr); | |
1002 | if (k < 0) | |
1003 | return k; | |
1004 | ||
1005 | sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr)); | |
1006 | ||
1007 | k = readlink_malloc(fn, &s); | |
1008 | if (k < 0) { | |
1009 | ||
1010 | if (k != -ENOENT) | |
1011 | return k; | |
1012 | ||
1013 | /* This is an ugly hack */ | |
1014 | if (major(devnr) == 136) { | |
1015 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) | |
1016 | return -ENOMEM; | |
1017 | } else { | |
1018 | /* Probably something like the ptys which have no | |
1019 | * symlink in /dev/char. Let's return something | |
1020 | * vaguely useful. */ | |
1021 | ||
1022 | b = strdup(fn + 5); | |
1023 | if (!b) | |
1024 | return -ENOMEM; | |
1025 | } | |
1026 | } else { | |
1027 | if (startswith(s, "/dev/")) | |
1028 | p = s + 5; | |
1029 | else if (startswith(s, "../")) | |
1030 | p = s + 3; | |
1031 | else | |
1032 | p = s; | |
1033 | ||
1034 | b = strdup(p); | |
1035 | if (!b) | |
1036 | return -ENOMEM; | |
1037 | } | |
1038 | ||
1039 | *r = b; | |
1040 | if (_devnr) | |
1041 | *_devnr = devnr; | |
1042 | ||
1043 | return 0; | |
1044 | } | |
a07c35c3 | 1045 | |
66cb2fde LP |
1046 | int ptsname_malloc(int fd, char **ret) { |
1047 | size_t l = 100; | |
1048 | ||
1049 | assert(fd >= 0); | |
1050 | assert(ret); | |
1051 | ||
1052 | for (;;) { | |
1053 | char *c; | |
1054 | ||
1055 | c = new(char, l); | |
1056 | if (!c) | |
1057 | return -ENOMEM; | |
1058 | ||
1059 | if (ptsname_r(fd, c, l) == 0) { | |
1060 | *ret = c; | |
1061 | return 0; | |
1062 | } | |
1063 | if (errno != ERANGE) { | |
1064 | free(c); | |
1065 | return -errno; | |
1066 | } | |
1067 | ||
1068 | free(c); | |
1069 | l *= 2; | |
1070 | } | |
1071 | } | |
1072 | ||
a07c35c3 LP |
1073 | int ptsname_namespace(int pty, char **ret) { |
1074 | int no = -1, r; | |
1075 | ||
1076 | /* Like ptsname(), but doesn't assume that the path is | |
1077 | * accessible in the local namespace. */ | |
1078 | ||
1079 | r = ioctl(pty, TIOCGPTN, &no); | |
1080 | if (r < 0) | |
1081 | return -errno; | |
1082 | ||
1083 | if (no < 0) | |
1084 | return -EIO; | |
1085 | ||
1086 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1087 | return -ENOMEM; | |
1088 | ||
1089 | return 0; | |
1090 | } | |
66cb2fde LP |
1091 | |
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 }; | |
66cb2fde LP |
1095 | pid_t child; |
1096 | int r; | |
1097 | ||
1098 | assert(pid > 0); | |
1099 | ||
1100 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1101 | if (r < 0) | |
1102 | return r; | |
1103 | ||
1104 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1105 | return -errno; | |
1106 | ||
4c253ed1 LP |
1107 | r = safe_fork("(sd-openpt)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child); |
1108 | if (r < 0) | |
1109 | return r; | |
1110 | if (r == 0) { | |
66cb2fde LP |
1111 | int master; |
1112 | ||
1113 | pair[0] = safe_close(pair[0]); | |
1114 | ||
1115 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1116 | if (r < 0) | |
1117 | _exit(EXIT_FAILURE); | |
1118 | ||
1119 | master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1120 | if (master < 0) | |
1121 | _exit(EXIT_FAILURE); | |
1122 | ||
1123 | if (unlockpt(master) < 0) | |
1124 | _exit(EXIT_FAILURE); | |
1125 | ||
1126 | if (send_one_fd(pair[1], master, 0) < 0) | |
1127 | _exit(EXIT_FAILURE); | |
1128 | ||
1129 | _exit(EXIT_SUCCESS); | |
1130 | } | |
1131 | ||
1132 | pair[1] = safe_close(pair[1]); | |
1133 | ||
2e87a1fd | 1134 | r = wait_for_terminate_and_check("(sd-openpt)", child, 0); |
66cb2fde LP |
1135 | if (r < 0) |
1136 | return r; | |
2e87a1fd | 1137 | if (r != EXIT_SUCCESS) |
66cb2fde LP |
1138 | return -EIO; |
1139 | ||
1140 | return receive_one_fd(pair[0], 0); | |
1141 | } | |
40e1f4ea LP |
1142 | |
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 }; | |
40e1f4ea LP |
1146 | pid_t child; |
1147 | int r; | |
1148 | ||
1149 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1150 | if (r < 0) | |
1151 | return r; | |
1152 | ||
1153 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1154 | return -errno; | |
1155 | ||
4c253ed1 LP |
1156 | r = safe_fork("(sd-terminal)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child); |
1157 | if (r < 0) | |
1158 | return r; | |
1159 | if (r == 0) { | |
40e1f4ea LP |
1160 | int master; |
1161 | ||
1162 | pair[0] = safe_close(pair[0]); | |
1163 | ||
1164 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1165 | if (r < 0) | |
1166 | _exit(EXIT_FAILURE); | |
1167 | ||
1168 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); | |
1169 | if (master < 0) | |
1170 | _exit(EXIT_FAILURE); | |
1171 | ||
1172 | if (send_one_fd(pair[1], master, 0) < 0) | |
1173 | _exit(EXIT_FAILURE); | |
1174 | ||
1175 | _exit(EXIT_SUCCESS); | |
1176 | } | |
1177 | ||
1178 | pair[1] = safe_close(pair[1]); | |
1179 | ||
2e87a1fd | 1180 | r = wait_for_terminate_and_check("(sd-terminal)", child, 0); |
40e1f4ea LP |
1181 | if (r < 0) |
1182 | return r; | |
2e87a1fd | 1183 | if (r != EXIT_SUCCESS) |
40e1f4ea LP |
1184 | return -EIO; |
1185 | ||
1186 | return receive_one_fd(pair[0], 0); | |
1187 | } | |
40c9fe4c | 1188 | |
158fbf76 | 1189 | static bool getenv_terminal_is_dumb(void) { |
ac96418b LP |
1190 | const char *e; |
1191 | ||
ac96418b LP |
1192 | e = getenv("TERM"); |
1193 | if (!e) | |
1194 | return true; | |
1195 | ||
1196 | return streq(e, "dumb"); | |
1197 | } | |
1198 | ||
158fbf76 ZJS |
1199 | bool terminal_is_dumb(void) { |
1200 | if (!on_tty()) | |
1201 | return true; | |
1202 | ||
1203 | return getenv_terminal_is_dumb(); | |
1204 | } | |
1205 | ||
40c9fe4c | 1206 | bool colors_enabled(void) { |
40c9fe4c | 1207 | |
c6063244 | 1208 | if (cached_colors_enabled < 0) { |
acf553b0 | 1209 | int val; |
ae5b3958 | 1210 | |
acf553b0 ZJS |
1211 | val = getenv_bool("SYSTEMD_COLORS"); |
1212 | if (val >= 0) | |
c6063244 | 1213 | cached_colors_enabled = val; |
df0ff127 | 1214 | else if (getpid_cached() == 1) |
158fbf76 | 1215 | /* PID1 outputs to the console without holding it open all the time */ |
c6063244 | 1216 | cached_colors_enabled = !getenv_terminal_is_dumb(); |
ae5b3958 | 1217 | else |
c6063244 | 1218 | cached_colors_enabled = !terminal_is_dumb(); |
40c9fe4c JS |
1219 | } |
1220 | ||
c6063244 | 1221 | return cached_colors_enabled; |
40c9fe4c | 1222 | } |
c83f349c | 1223 | |
526664f6 | 1224 | bool underline_enabled(void) { |
526664f6 | 1225 | |
c6063244 | 1226 | if (cached_underline_enabled < 0) { |
526664f6 LP |
1227 | |
1228 | /* The Linux console doesn't support underlining, turn it off, but only there. */ | |
1229 | ||
c6063244 LP |
1230 | if (colors_enabled()) |
1231 | cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux"); | |
526664f6 | 1232 | else |
c6063244 | 1233 | cached_underline_enabled = false; |
526664f6 LP |
1234 | } |
1235 | ||
c6063244 | 1236 | return cached_underline_enabled; |
526664f6 LP |
1237 | } |
1238 | ||
c83f349c LP |
1239 | int vt_default_utf8(void) { |
1240 | _cleanup_free_ char *b = NULL; | |
1241 | int r; | |
1242 | ||
1243 | /* Read the default VT UTF8 setting from the kernel */ | |
1244 | ||
1245 | r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b); | |
1246 | if (r < 0) | |
1247 | return r; | |
1248 | ||
1249 | return parse_boolean(b); | |
1250 | } | |
1251 | ||
1252 | int vt_reset_keyboard(int fd) { | |
1253 | int kb; | |
1254 | ||
1255 | /* If we can't read the default, then default to unicode. It's 2017 after all. */ | |
1256 | kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE; | |
1257 | ||
1258 | if (ioctl(fd, KDSKBMODE, kb) < 0) | |
1259 | return -errno; | |
1260 | ||
1261 | return 0; | |
1262 | } |