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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 | |
288a74cc RC |
6 | ***/ |
7 | ||
11c3a366 | 8 | #include <errno.h> |
07630cea | 9 | #include <fcntl.h> |
11c3a366 TA |
10 | #include <limits.h> |
11 | #include <stdarg.h> | |
12 | #include <stddef.h> | |
13 | #include <stdlib.h> | |
14 | #include <string.h> | |
15 | #include <sys/inotify.h> | |
16 | #include <sys/socket.h> | |
17 | #include <sys/sysmacros.h> | |
18 | #include <sys/time.h> | |
07630cea LP |
19 | #include <linux/kd.h> |
20 | #include <linux/tiocl.h> | |
21 | #include <linux/vt.h> | |
22 | #include <poll.h> | |
23 | #include <signal.h> | |
288a74cc | 24 | #include <sys/ioctl.h> |
07630cea | 25 | #include <sys/types.h> |
288a74cc | 26 | #include <termios.h> |
07630cea | 27 | #include <unistd.h> |
288a74cc | 28 | |
b5efdb8a | 29 | #include "alloc-util.h" |
acf553b0 | 30 | #include "env-util.h" |
3ffd4af2 | 31 | #include "fd-util.h" |
288a74cc | 32 | #include "fileio.h" |
f4f15635 | 33 | #include "fs-util.h" |
c004493c | 34 | #include "io-util.h" |
93cc7779 TA |
35 | #include "log.h" |
36 | #include "macro.h" | |
6bedfcbb | 37 | #include "parse-util.h" |
c2b32159 LP |
38 | #include "path-util.h" |
39 | #include "proc-cmdline.h" | |
07630cea | 40 | #include "process-util.h" |
2583fbea | 41 | #include "socket-util.h" |
8fcde012 | 42 | #include "stat-util.h" |
07630cea | 43 | #include "string-util.h" |
6af62124 | 44 | #include "strv.h" |
3ffd4af2 | 45 | #include "terminal-util.h" |
07630cea LP |
46 | #include "time-util.h" |
47 | #include "util.h" | |
288a74cc RC |
48 | |
49 | static volatile unsigned cached_columns = 0; | |
50 | static volatile unsigned cached_lines = 0; | |
51 | ||
c6063244 LP |
52 | static volatile int cached_on_tty = -1; |
53 | static volatile int cached_colors_enabled = -1; | |
54 | static volatile int cached_underline_enabled = -1; | |
55 | ||
288a74cc RC |
56 | int chvt(int vt) { |
57 | _cleanup_close_ int fd; | |
58 | ||
0295642d LP |
59 | /* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go, |
60 | * if that's configured. */ | |
61 | ||
0a8b555c | 62 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
63 | if (fd < 0) |
64 | return -errno; | |
65 | ||
b9e74c39 | 66 | if (vt <= 0) { |
288a74cc RC |
67 | int tiocl[2] = { |
68 | TIOCL_GETKMSGREDIRECT, | |
69 | 0 | |
70 | }; | |
71 | ||
72 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
73 | return -errno; | |
74 | ||
75 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
76 | } | |
77 | ||
78 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
79 | return -errno; | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
85 | struct termios old_termios, new_termios; | |
86 | char c, line[LINE_MAX]; | |
87 | ||
88 | assert(f); | |
89 | assert(ret); | |
90 | ||
91 | if (tcgetattr(fileno(f), &old_termios) >= 0) { | |
92 | new_termios = old_termios; | |
93 | ||
94 | new_termios.c_lflag &= ~ICANON; | |
95 | new_termios.c_cc[VMIN] = 1; | |
96 | new_termios.c_cc[VTIME] = 0; | |
97 | ||
98 | if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { | |
99 | size_t k; | |
100 | ||
101 | if (t != USEC_INFINITY) { | |
102 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { | |
103 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
104 | return -ETIMEDOUT; | |
105 | } | |
106 | } | |
107 | ||
108 | k = fread(&c, 1, 1, f); | |
109 | ||
110 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
111 | ||
112 | if (k <= 0) | |
113 | return -EIO; | |
114 | ||
115 | if (need_nl) | |
116 | *need_nl = c != '\n'; | |
117 | ||
118 | *ret = c; | |
119 | return 0; | |
120 | } | |
121 | } | |
122 | ||
123 | if (t != USEC_INFINITY) { | |
124 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) | |
125 | return -ETIMEDOUT; | |
126 | } | |
127 | ||
128 | errno = 0; | |
129 | if (!fgets(line, sizeof(line), f)) | |
f5e5c28f | 130 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
131 | |
132 | truncate_nl(line); | |
133 | ||
134 | if (strlen(line) != 1) | |
135 | return -EBADMSG; | |
136 | ||
137 | if (need_nl) | |
138 | *need_nl = false; | |
139 | ||
140 | *ret = line[0]; | |
141 | return 0; | |
142 | } | |
143 | ||
3c670f89 FB |
144 | #define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC) |
145 | ||
146 | int ask_char(char *ret, const char *replies, const char *fmt, ...) { | |
288a74cc RC |
147 | int r; |
148 | ||
149 | assert(ret); | |
150 | assert(replies); | |
3c670f89 | 151 | assert(fmt); |
288a74cc RC |
152 | |
153 | for (;;) { | |
154 | va_list ap; | |
155 | char c; | |
156 | bool need_nl = true; | |
157 | ||
7565bb98 | 158 | if (colors_enabled()) |
1fc464f6 | 159 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc | 160 | |
3c670f89 FB |
161 | putchar('\r'); |
162 | ||
163 | va_start(ap, fmt); | |
164 | vprintf(fmt, ap); | |
288a74cc RC |
165 | va_end(ap); |
166 | ||
7565bb98 | 167 | if (colors_enabled()) |
1fc464f6 | 168 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
169 | |
170 | fflush(stdout); | |
171 | ||
3c670f89 | 172 | r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl); |
288a74cc RC |
173 | if (r < 0) { |
174 | ||
3c670f89 FB |
175 | if (r == -ETIMEDOUT) |
176 | continue; | |
177 | ||
288a74cc RC |
178 | if (r == -EBADMSG) { |
179 | puts("Bad input, please try again."); | |
180 | continue; | |
181 | } | |
182 | ||
183 | putchar('\n'); | |
184 | return r; | |
185 | } | |
186 | ||
187 | if (need_nl) | |
188 | putchar('\n'); | |
189 | ||
190 | if (strchr(replies, c)) { | |
191 | *ret = c; | |
192 | return 0; | |
193 | } | |
194 | ||
195 | puts("Read unexpected character, please try again."); | |
196 | } | |
197 | } | |
198 | ||
199 | int ask_string(char **ret, const char *text, ...) { | |
200 | assert(ret); | |
201 | assert(text); | |
202 | ||
203 | for (;;) { | |
204 | char line[LINE_MAX]; | |
205 | va_list ap; | |
206 | ||
7565bb98 | 207 | if (colors_enabled()) |
1fc464f6 | 208 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
209 | |
210 | va_start(ap, text); | |
211 | vprintf(text, ap); | |
212 | va_end(ap); | |
213 | ||
7565bb98 | 214 | if (colors_enabled()) |
1fc464f6 | 215 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
216 | |
217 | fflush(stdout); | |
218 | ||
219 | errno = 0; | |
220 | if (!fgets(line, sizeof(line), stdin)) | |
f5e5c28f | 221 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
222 | |
223 | if (!endswith(line, "\n")) | |
224 | putchar('\n'); | |
225 | else { | |
226 | char *s; | |
227 | ||
228 | if (isempty(line)) | |
229 | continue; | |
230 | ||
231 | truncate_nl(line); | |
232 | s = strdup(line); | |
233 | if (!s) | |
234 | return -ENOMEM; | |
235 | ||
236 | *ret = s; | |
237 | return 0; | |
238 | } | |
239 | } | |
240 | } | |
241 | ||
242 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
243 | struct termios termios; | |
244 | int r = 0; | |
245 | ||
246 | /* Set terminal to some sane defaults */ | |
247 | ||
248 | assert(fd >= 0); | |
249 | ||
250 | /* We leave locked terminal attributes untouched, so that | |
251 | * Plymouth may set whatever it wants to set, and we don't | |
252 | * interfere with that. */ | |
253 | ||
254 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 255 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
256 | |
257 | /* Switch to text mode */ | |
258 | if (switch_to_text) | |
7d927c9a | 259 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc | 260 | |
73e669e0 | 261 | /* Set default keyboard mode */ |
c83f349c | 262 | (void) vt_reset_keyboard(fd); |
288a74cc RC |
263 | |
264 | if (tcgetattr(fd, &termios) < 0) { | |
265 | r = -errno; | |
266 | goto finish; | |
267 | } | |
268 | ||
269 | /* We only reset the stuff that matters to the software. How | |
270 | * hardware is set up we don't touch assuming that somebody | |
271 | * else will do that for us */ | |
272 | ||
273 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
274 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
275 | termios.c_oflag |= ONLCR; | |
276 | termios.c_cflag |= CREAD; | |
277 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
278 | ||
279 | termios.c_cc[VINTR] = 03; /* ^C */ | |
280 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
281 | termios.c_cc[VERASE] = 0177; | |
282 | termios.c_cc[VKILL] = 025; /* ^X */ | |
283 | termios.c_cc[VEOF] = 04; /* ^D */ | |
284 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
285 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
286 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
287 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
288 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
289 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
290 | termios.c_cc[VEOL] = 0; | |
291 | termios.c_cc[VEOL2] = 0; | |
292 | ||
293 | termios.c_cc[VTIME] = 0; | |
294 | termios.c_cc[VMIN] = 1; | |
295 | ||
296 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
297 | r = -errno; | |
298 | ||
299 | finish: | |
300 | /* Just in case, flush all crap out */ | |
7d927c9a | 301 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
302 | |
303 | return r; | |
304 | } | |
305 | ||
306 | int reset_terminal(const char *name) { | |
307 | _cleanup_close_ int fd = -1; | |
308 | ||
0a8b555c LP |
309 | /* We open the terminal with O_NONBLOCK here, to ensure we |
310 | * don't block on carrier if this is a terminal with carrier | |
311 | * configured. */ | |
312 | ||
313 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
314 | if (fd < 0) |
315 | return fd; | |
316 | ||
317 | return reset_terminal_fd(fd, true); | |
318 | } | |
319 | ||
320 | int open_terminal(const char *name, int mode) { | |
288a74cc | 321 | unsigned c = 0; |
87964ec7 | 322 | int fd; |
288a74cc RC |
323 | |
324 | /* | |
325 | * If a TTY is in the process of being closed opening it might | |
326 | * cause EIO. This is horribly awful, but unlikely to be | |
327 | * changed in the kernel. Hence we work around this problem by | |
328 | * retrying a couple of times. | |
329 | * | |
330 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
331 | */ | |
332 | ||
35bdab77 LP |
333 | if (mode & O_CREAT) |
334 | return -EINVAL; | |
288a74cc RC |
335 | |
336 | for (;;) { | |
337 | fd = open(name, mode, 0); | |
338 | if (fd >= 0) | |
339 | break; | |
340 | ||
341 | if (errno != EIO) | |
342 | return -errno; | |
343 | ||
344 | /* Max 1s in total */ | |
345 | if (c >= 20) | |
346 | return -errno; | |
347 | ||
348 | usleep(50 * USEC_PER_MSEC); | |
349 | c++; | |
350 | } | |
351 | ||
87964ec7 | 352 | if (isatty(fd) <= 0) { |
288a74cc RC |
353 | safe_close(fd); |
354 | return -ENOTTY; | |
355 | } | |
356 | ||
357 | return fd; | |
358 | } | |
359 | ||
360 | int acquire_terminal( | |
361 | const char *name, | |
8854d795 | 362 | AcquireTerminalFlags flags, |
288a74cc RC |
363 | usec_t timeout) { |
364 | ||
8854d795 LP |
365 | _cleanup_close_ int notify = -1, fd = -1; |
366 | usec_t ts = USEC_INFINITY; | |
367 | int r, wd = -1; | |
288a74cc RC |
368 | |
369 | assert(name); | |
8854d795 | 370 | assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT)); |
288a74cc | 371 | |
8854d795 LP |
372 | /* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually |
373 | * acquire it, so that we don't lose any event. | |
288a74cc | 374 | * |
8854d795 LP |
375 | * Note: strictly speaking this actually watches for the device being closed, it does *not* really watch |
376 | * whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty | |
f95dbcc2 ZJS |
377 | * *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to |
378 | * not configure any service on the same tty as an untrusted user this should not be a problem. (Which they | |
8854d795 LP |
379 | * probably should not do anyway.) */ |
380 | ||
381 | if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) { | |
288a74cc | 382 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); |
8854d795 LP |
383 | if (notify < 0) |
384 | return -errno; | |
288a74cc RC |
385 | |
386 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
8854d795 LP |
387 | if (wd < 0) |
388 | return -errno; | |
389 | ||
390 | if (timeout != USEC_INFINITY) | |
391 | ts = now(CLOCK_MONOTONIC); | |
288a74cc RC |
392 | } |
393 | ||
394 | for (;;) { | |
395 | struct sigaction sa_old, sa_new = { | |
396 | .sa_handler = SIG_IGN, | |
397 | .sa_flags = SA_RESTART, | |
398 | }; | |
399 | ||
400 | if (notify >= 0) { | |
401 | r = flush_fd(notify); | |
402 | if (r < 0) | |
8854d795 | 403 | return r; |
288a74cc RC |
404 | } |
405 | ||
8854d795 LP |
406 | /* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way |
407 | * to figure out if we successfully became the controlling process of the tty */ | |
288a74cc RC |
408 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); |
409 | if (fd < 0) | |
410 | return fd; | |
411 | ||
8854d795 | 412 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */ |
288a74cc RC |
413 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); |
414 | ||
415 | /* First, try to get the tty */ | |
8854d795 LP |
416 | r = ioctl(fd, TIOCSCTTY, |
417 | (flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0; | |
288a74cc | 418 | |
8854d795 | 419 | /* Reset signal handler to old value */ |
288a74cc RC |
420 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); |
421 | ||
8854d795 LP |
422 | /* Success? Exit the loop now! */ |
423 | if (r >= 0) | |
424 | break; | |
288a74cc | 425 | |
8854d795 LP |
426 | /* Any failure besides -EPERM? Fail, regardless of the mode. */ |
427 | if (r != -EPERM) | |
428 | return r; | |
288a74cc | 429 | |
8854d795 LP |
430 | if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this |
431 | * into a success. Note that EPERM is also returned if we | |
432 | * already are the owner of the TTY. */ | |
288a74cc RC |
433 | break; |
434 | ||
8854d795 LP |
435 | if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */ |
436 | return r; | |
437 | ||
288a74cc | 438 | assert(notify >= 0); |
8854d795 | 439 | assert(wd >= 0); |
288a74cc RC |
440 | |
441 | for (;;) { | |
442 | union inotify_event_buffer buffer; | |
443 | struct inotify_event *e; | |
444 | ssize_t l; | |
445 | ||
446 | if (timeout != USEC_INFINITY) { | |
447 | usec_t n; | |
448 | ||
8854d795 LP |
449 | assert(ts != USEC_INFINITY); |
450 | ||
288a74cc | 451 | n = now(CLOCK_MONOTONIC); |
8854d795 LP |
452 | if (ts + timeout < n) |
453 | return -ETIMEDOUT; | |
288a74cc | 454 | |
f80da6f3 | 455 | r = fd_wait_for_event(notify, POLLIN, ts + timeout - n); |
288a74cc | 456 | if (r < 0) |
8854d795 LP |
457 | return r; |
458 | if (r == 0) | |
459 | return -ETIMEDOUT; | |
288a74cc RC |
460 | } |
461 | ||
462 | l = read(notify, &buffer, sizeof(buffer)); | |
463 | if (l < 0) { | |
3742095b | 464 | if (IN_SET(errno, EINTR, EAGAIN)) |
288a74cc RC |
465 | continue; |
466 | ||
8854d795 | 467 | return -errno; |
288a74cc RC |
468 | } |
469 | ||
470 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
8854d795 LP |
471 | if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */ |
472 | break; | |
473 | ||
474 | if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */ | |
475 | return -EIO; | |
288a74cc RC |
476 | } |
477 | ||
478 | break; | |
479 | } | |
480 | ||
8854d795 LP |
481 | /* We close the tty fd here since if the old session ended our handle will be dead. It's important that |
482 | * we do this after sleeping, so that we don't enter an endless loop. */ | |
288a74cc RC |
483 | fd = safe_close(fd); |
484 | } | |
485 | ||
c10d6bdb | 486 | return TAKE_FD(fd); |
288a74cc RC |
487 | } |
488 | ||
489 | int release_terminal(void) { | |
490 | static const struct sigaction sa_new = { | |
491 | .sa_handler = SIG_IGN, | |
492 | .sa_flags = SA_RESTART, | |
493 | }; | |
494 | ||
495 | _cleanup_close_ int fd = -1; | |
496 | struct sigaction sa_old; | |
87964ec7 | 497 | int r; |
288a74cc | 498 | |
0a8b555c | 499 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
500 | if (fd < 0) |
501 | return -errno; | |
502 | ||
503 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
504 | * by our own TIOCNOTTY */ | |
505 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
506 | ||
87964ec7 | 507 | r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0; |
288a74cc RC |
508 | |
509 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
510 | ||
511 | return r; | |
512 | } | |
513 | ||
514 | int terminal_vhangup_fd(int fd) { | |
515 | assert(fd >= 0); | |
516 | ||
517 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
518 | return -errno; | |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
523 | int terminal_vhangup(const char *name) { | |
524 | _cleanup_close_ int fd; | |
525 | ||
0a8b555c | 526 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
527 | if (fd < 0) |
528 | return fd; | |
529 | ||
530 | return terminal_vhangup_fd(fd); | |
531 | } | |
532 | ||
533 | int vt_disallocate(const char *name) { | |
1ba23931 | 534 | _cleanup_close_ int fd = -1; |
27458ed6 | 535 | const char *e, *n; |
288a74cc | 536 | unsigned u; |
1ba23931 | 537 | int r; |
288a74cc RC |
538 | |
539 | /* Deallocate the VT if possible. If not possible | |
540 | * (i.e. because it is the active one), at least clear it | |
541 | * entirely (including the scrollback buffer) */ | |
542 | ||
27458ed6 LP |
543 | e = path_startswith(name, "/dev/"); |
544 | if (!e) | |
288a74cc RC |
545 | return -EINVAL; |
546 | ||
547 | if (!tty_is_vc(name)) { | |
548 | /* So this is not a VT. I guess we cannot deallocate | |
549 | * it then. But let's at least clear the screen */ | |
550 | ||
551 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
552 | if (fd < 0) | |
553 | return fd; | |
554 | ||
555 | loop_write(fd, | |
556 | "\033[r" /* clear scrolling region */ | |
557 | "\033[H" /* move home */ | |
558 | "\033[2J", /* clear screen */ | |
559 | 10, false); | |
288a74cc RC |
560 | return 0; |
561 | } | |
562 | ||
27458ed6 LP |
563 | n = startswith(e, "tty"); |
564 | if (!n) | |
288a74cc RC |
565 | return -EINVAL; |
566 | ||
27458ed6 | 567 | r = safe_atou(n, &u); |
288a74cc RC |
568 | if (r < 0) |
569 | return r; | |
570 | ||
571 | if (u <= 0) | |
572 | return -EINVAL; | |
573 | ||
574 | /* Try to deallocate */ | |
0a8b555c | 575 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
576 | if (fd < 0) |
577 | return fd; | |
578 | ||
579 | r = ioctl(fd, VT_DISALLOCATE, u); | |
1ba23931 | 580 | fd = safe_close(fd); |
288a74cc RC |
581 | |
582 | if (r >= 0) | |
583 | return 0; | |
584 | ||
585 | if (errno != EBUSY) | |
586 | return -errno; | |
587 | ||
588 | /* Couldn't deallocate, so let's clear it fully with | |
589 | * scrollback */ | |
590 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
591 | if (fd < 0) | |
592 | return fd; | |
593 | ||
594 | loop_write(fd, | |
595 | "\033[r" /* clear scrolling region */ | |
596 | "\033[H" /* move home */ | |
597 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
598 | 10, false); | |
288a74cc RC |
599 | return 0; |
600 | } | |
601 | ||
288a74cc RC |
602 | int make_console_stdio(void) { |
603 | int fd, r; | |
604 | ||
605 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
606 | ||
8854d795 | 607 | fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY); |
288a74cc RC |
608 | if (fd < 0) |
609 | return log_error_errno(fd, "Failed to acquire terminal: %m"); | |
610 | ||
3d18b167 LP |
611 | r = reset_terminal_fd(fd, true); |
612 | if (r < 0) | |
613 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
614 | ||
8bb2db73 | 615 | r = rearrange_stdio(fd, fd, fd); /* This invalidates 'fd' both on success and on failure. */ |
288a74cc | 616 | if (r < 0) |
8bb2db73 | 617 | return log_error_errno(r, "Failed to make terminal stdin/stdout/stderr: %m"); |
288a74cc | 618 | |
c6063244 LP |
619 | reset_terminal_feature_caches(); |
620 | ||
288a74cc RC |
621 | return 0; |
622 | } | |
623 | ||
288a74cc RC |
624 | bool tty_is_vc(const char *tty) { |
625 | assert(tty); | |
626 | ||
627 | return vtnr_from_tty(tty) >= 0; | |
628 | } | |
629 | ||
630 | bool tty_is_console(const char *tty) { | |
631 | assert(tty); | |
632 | ||
a119ec7c | 633 | return streq(skip_dev_prefix(tty), "console"); |
288a74cc RC |
634 | } |
635 | ||
636 | int vtnr_from_tty(const char *tty) { | |
637 | int i, r; | |
638 | ||
639 | assert(tty); | |
640 | ||
a119ec7c | 641 | tty = skip_dev_prefix(tty); |
288a74cc RC |
642 | |
643 | if (!startswith(tty, "tty") ) | |
644 | return -EINVAL; | |
645 | ||
646 | if (tty[3] < '0' || tty[3] > '9') | |
647 | return -EINVAL; | |
648 | ||
649 | r = safe_atoi(tty+3, &i); | |
650 | if (r < 0) | |
651 | return r; | |
652 | ||
653 | if (i < 0 || i > 63) | |
654 | return -EINVAL; | |
655 | ||
656 | return i; | |
657 | } | |
658 | ||
7b912648 LP |
659 | int resolve_dev_console(char **ret) { |
660 | _cleanup_free_ char *active = NULL; | |
288a74cc | 661 | char *tty; |
7b912648 | 662 | int r; |
288a74cc | 663 | |
7b912648 LP |
664 | assert(ret); |
665 | ||
666 | /* Resolve where /dev/console is pointing to, if /sys is actually ours (i.e. not read-only-mounted which is a | |
667 | * sign for container setups) */ | |
288a74cc RC |
668 | |
669 | if (path_is_read_only_fs("/sys") > 0) | |
7b912648 | 670 | return -ENOMEDIUM; |
288a74cc | 671 | |
7b912648 LP |
672 | r = read_one_line_file("/sys/class/tty/console/active", &active); |
673 | if (r < 0) | |
674 | return r; | |
288a74cc | 675 | |
7b912648 LP |
676 | /* If multiple log outputs are configured the last one is what /dev/console points to */ |
677 | tty = strrchr(active, ' '); | |
288a74cc RC |
678 | if (tty) |
679 | tty++; | |
680 | else | |
7b912648 | 681 | tty = active; |
288a74cc RC |
682 | |
683 | if (streq(tty, "tty0")) { | |
7b912648 | 684 | active = mfree(active); |
288a74cc RC |
685 | |
686 | /* Get the active VC (e.g. tty1) */ | |
7b912648 LP |
687 | r = read_one_line_file("/sys/class/tty/tty0/active", &active); |
688 | if (r < 0) | |
689 | return r; | |
690 | ||
691 | tty = active; | |
692 | } | |
693 | ||
ae2a15bc LP |
694 | if (tty == active) |
695 | *ret = TAKE_PTR(active); | |
696 | else { | |
7b912648 LP |
697 | char *tmp; |
698 | ||
699 | tmp = strdup(tty); | |
700 | if (!tmp) | |
701 | return -ENOMEM; | |
702 | ||
703 | *ret = tmp; | |
288a74cc RC |
704 | } |
705 | ||
7b912648 | 706 | return 0; |
288a74cc RC |
707 | } |
708 | ||
bef41af2 LP |
709 | int get_kernel_consoles(char ***ret) { |
710 | _cleanup_strv_free_ char **l = NULL; | |
6af62124 | 711 | _cleanup_free_ char *line = NULL; |
bef41af2 | 712 | const char *p; |
6af62124 WF |
713 | int r; |
714 | ||
bef41af2 LP |
715 | assert(ret); |
716 | ||
f95dbcc2 | 717 | /* If /sys is mounted read-only this means we are running in some kind of container environment. In that |
bef41af2 LP |
718 | * case /sys would reflect the host system, not us, hence ignore the data we can read from it. */ |
719 | if (path_is_read_only_fs("/sys") > 0) | |
720 | goto fallback; | |
6af62124 WF |
721 | |
722 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
723 | if (r < 0) | |
724 | return r; | |
725 | ||
bef41af2 | 726 | p = line; |
6af62124 WF |
727 | for (;;) { |
728 | _cleanup_free_ char *tty = NULL; | |
729 | char *path; | |
730 | ||
bef41af2 | 731 | r = extract_first_word(&p, &tty, NULL, 0); |
6af62124 WF |
732 | if (r < 0) |
733 | return r; | |
734 | if (r == 0) | |
735 | break; | |
736 | ||
737 | if (streq(tty, "tty0")) { | |
738 | tty = mfree(tty); | |
739 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
740 | if (r < 0) | |
741 | return r; | |
742 | } | |
743 | ||
744 | path = strappend("/dev/", tty); | |
745 | if (!path) | |
746 | return -ENOMEM; | |
747 | ||
748 | if (access(path, F_OK) < 0) { | |
749 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
750 | free(path); | |
751 | continue; | |
752 | } | |
753 | ||
bef41af2 | 754 | r = strv_consume(&l, path); |
6af62124 WF |
755 | if (r < 0) |
756 | return r; | |
757 | } | |
758 | ||
bef41af2 | 759 | if (strv_isempty(l)) { |
6af62124 | 760 | log_debug("No devices found for system console"); |
bef41af2 | 761 | goto fallback; |
6af62124 WF |
762 | } |
763 | ||
ae2a15bc | 764 | *ret = TAKE_PTR(l); |
bef41af2 LP |
765 | |
766 | return 0; | |
767 | ||
768 | fallback: | |
769 | r = strv_extend(&l, "/dev/console"); | |
770 | if (r < 0) | |
771 | return r; | |
772 | ||
ae2a15bc | 773 | *ret = TAKE_PTR(l); |
bef41af2 | 774 | |
6af62124 WF |
775 | return 0; |
776 | } | |
777 | ||
288a74cc | 778 | bool tty_is_vc_resolve(const char *tty) { |
7b912648 | 779 | _cleanup_free_ char *resolved = NULL; |
288a74cc RC |
780 | |
781 | assert(tty); | |
782 | ||
a119ec7c | 783 | tty = skip_dev_prefix(tty); |
288a74cc RC |
784 | |
785 | if (streq(tty, "console")) { | |
7b912648 | 786 | if (resolve_dev_console(&resolved) < 0) |
288a74cc | 787 | return false; |
7b912648 LP |
788 | |
789 | tty = resolved; | |
288a74cc RC |
790 | } |
791 | ||
792 | return tty_is_vc(tty); | |
793 | } | |
794 | ||
795 | const char *default_term_for_tty(const char *tty) { | |
6af760f3 | 796 | return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220"; |
288a74cc RC |
797 | } |
798 | ||
799 | int fd_columns(int fd) { | |
800 | struct winsize ws = {}; | |
801 | ||
802 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
803 | return -errno; | |
804 | ||
805 | if (ws.ws_col <= 0) | |
806 | return -EIO; | |
807 | ||
808 | return ws.ws_col; | |
809 | } | |
810 | ||
811 | unsigned columns(void) { | |
812 | const char *e; | |
813 | int c; | |
814 | ||
c6063244 | 815 | if (cached_columns > 0) |
288a74cc RC |
816 | return cached_columns; |
817 | ||
818 | c = 0; | |
819 | e = getenv("COLUMNS"); | |
820 | if (e) | |
821 | (void) safe_atoi(e, &c); | |
822 | ||
823 | if (c <= 0) | |
824 | c = fd_columns(STDOUT_FILENO); | |
825 | ||
826 | if (c <= 0) | |
827 | c = 80; | |
828 | ||
829 | cached_columns = c; | |
830 | return cached_columns; | |
831 | } | |
832 | ||
833 | int fd_lines(int fd) { | |
834 | struct winsize ws = {}; | |
835 | ||
836 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
837 | return -errno; | |
838 | ||
839 | if (ws.ws_row <= 0) | |
840 | return -EIO; | |
841 | ||
842 | return ws.ws_row; | |
843 | } | |
844 | ||
845 | unsigned lines(void) { | |
846 | const char *e; | |
847 | int l; | |
848 | ||
c6063244 | 849 | if (cached_lines > 0) |
288a74cc RC |
850 | return cached_lines; |
851 | ||
852 | l = 0; | |
853 | e = getenv("LINES"); | |
854 | if (e) | |
855 | (void) safe_atoi(e, &l); | |
856 | ||
857 | if (l <= 0) | |
858 | l = fd_lines(STDOUT_FILENO); | |
859 | ||
860 | if (l <= 0) | |
861 | l = 24; | |
862 | ||
863 | cached_lines = l; | |
864 | return cached_lines; | |
865 | } | |
866 | ||
867 | /* intended to be used as a SIGWINCH sighandler */ | |
868 | void columns_lines_cache_reset(int signum) { | |
869 | cached_columns = 0; | |
870 | cached_lines = 0; | |
871 | } | |
872 | ||
c6063244 LP |
873 | void reset_terminal_feature_caches(void) { |
874 | cached_columns = 0; | |
875 | cached_lines = 0; | |
876 | ||
877 | cached_colors_enabled = -1; | |
878 | cached_underline_enabled = -1; | |
879 | cached_on_tty = -1; | |
880 | } | |
288a74cc | 881 | |
c6063244 LP |
882 | bool on_tty(void) { |
883 | if (cached_on_tty < 0) | |
288a74cc RC |
884 | cached_on_tty = isatty(STDOUT_FILENO) > 0; |
885 | ||
886 | return cached_on_tty; | |
887 | } | |
888 | ||
288a74cc RC |
889 | int getttyname_malloc(int fd, char **ret) { |
890 | size_t l = 100; | |
891 | int r; | |
892 | ||
893 | assert(fd >= 0); | |
894 | assert(ret); | |
895 | ||
896 | for (;;) { | |
897 | char path[l]; | |
898 | ||
899 | r = ttyname_r(fd, path, sizeof(path)); | |
900 | if (r == 0) { | |
288a74cc RC |
901 | char *c; |
902 | ||
a119ec7c | 903 | c = strdup(skip_dev_prefix(path)); |
288a74cc RC |
904 | if (!c) |
905 | return -ENOMEM; | |
906 | ||
907 | *ret = c; | |
908 | return 0; | |
909 | } | |
910 | ||
911 | if (r != ERANGE) | |
912 | return -r; | |
913 | ||
914 | l *= 2; | |
915 | } | |
916 | ||
917 | return 0; | |
918 | } | |
919 | ||
920 | int getttyname_harder(int fd, char **r) { | |
921 | int k; | |
922 | char *s = NULL; | |
923 | ||
924 | k = getttyname_malloc(fd, &s); | |
925 | if (k < 0) | |
926 | return k; | |
927 | ||
928 | if (streq(s, "tty")) { | |
929 | free(s); | |
930 | return get_ctty(0, NULL, r); | |
931 | } | |
932 | ||
933 | *r = s; | |
934 | return 0; | |
935 | } | |
936 | ||
937 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
938 | int r; | |
939 | _cleanup_free_ char *line = NULL; | |
940 | const char *p; | |
941 | unsigned long ttynr; | |
942 | ||
943 | assert(pid >= 0); | |
944 | ||
945 | p = procfs_file_alloca(pid, "stat"); | |
946 | r = read_one_line_file(p, &line); | |
947 | if (r < 0) | |
948 | return r; | |
949 | ||
950 | p = strrchr(line, ')'); | |
951 | if (!p) | |
952 | return -EIO; | |
953 | ||
954 | p++; | |
955 | ||
956 | if (sscanf(p, " " | |
957 | "%*c " /* state */ | |
958 | "%*d " /* ppid */ | |
959 | "%*d " /* pgrp */ | |
960 | "%*d " /* session */ | |
961 | "%lu ", /* ttynr */ | |
962 | &ttynr) != 1) | |
963 | return -EIO; | |
964 | ||
965 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 966 | return -ENXIO; |
288a74cc RC |
967 | |
968 | if (d) | |
969 | *d = (dev_t) ttynr; | |
970 | ||
971 | return 0; | |
972 | } | |
973 | ||
974 | int get_ctty(pid_t pid, dev_t *_devnr, char **r) { | |
fbd0b64f | 975 | char fn[STRLEN("/dev/char/") + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL; |
288a74cc RC |
976 | _cleanup_free_ char *s = NULL; |
977 | const char *p; | |
978 | dev_t devnr; | |
979 | int k; | |
980 | ||
981 | assert(r); | |
982 | ||
983 | k = get_ctty_devnr(pid, &devnr); | |
984 | if (k < 0) | |
985 | return k; | |
986 | ||
987 | sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr)); | |
988 | ||
989 | k = readlink_malloc(fn, &s); | |
990 | if (k < 0) { | |
991 | ||
992 | if (k != -ENOENT) | |
993 | return k; | |
994 | ||
995 | /* This is an ugly hack */ | |
996 | if (major(devnr) == 136) { | |
997 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) | |
998 | return -ENOMEM; | |
999 | } else { | |
1000 | /* Probably something like the ptys which have no | |
1001 | * symlink in /dev/char. Let's return something | |
1002 | * vaguely useful. */ | |
1003 | ||
1004 | b = strdup(fn + 5); | |
1005 | if (!b) | |
1006 | return -ENOMEM; | |
1007 | } | |
1008 | } else { | |
1009 | if (startswith(s, "/dev/")) | |
1010 | p = s + 5; | |
1011 | else if (startswith(s, "../")) | |
1012 | p = s + 3; | |
1013 | else | |
1014 | p = s; | |
1015 | ||
1016 | b = strdup(p); | |
1017 | if (!b) | |
1018 | return -ENOMEM; | |
1019 | } | |
1020 | ||
1021 | *r = b; | |
1022 | if (_devnr) | |
1023 | *_devnr = devnr; | |
1024 | ||
1025 | return 0; | |
1026 | } | |
a07c35c3 | 1027 | |
66cb2fde LP |
1028 | int ptsname_malloc(int fd, char **ret) { |
1029 | size_t l = 100; | |
1030 | ||
1031 | assert(fd >= 0); | |
1032 | assert(ret); | |
1033 | ||
1034 | for (;;) { | |
1035 | char *c; | |
1036 | ||
1037 | c = new(char, l); | |
1038 | if (!c) | |
1039 | return -ENOMEM; | |
1040 | ||
1041 | if (ptsname_r(fd, c, l) == 0) { | |
1042 | *ret = c; | |
1043 | return 0; | |
1044 | } | |
1045 | if (errno != ERANGE) { | |
1046 | free(c); | |
1047 | return -errno; | |
1048 | } | |
1049 | ||
1050 | free(c); | |
1051 | l *= 2; | |
1052 | } | |
1053 | } | |
1054 | ||
a07c35c3 LP |
1055 | int ptsname_namespace(int pty, char **ret) { |
1056 | int no = -1, r; | |
1057 | ||
1058 | /* Like ptsname(), but doesn't assume that the path is | |
1059 | * accessible in the local namespace. */ | |
1060 | ||
1061 | r = ioctl(pty, TIOCGPTN, &no); | |
1062 | if (r < 0) | |
1063 | return -errno; | |
1064 | ||
1065 | if (no < 0) | |
1066 | return -EIO; | |
1067 | ||
1068 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1069 | return -ENOMEM; | |
1070 | ||
1071 | return 0; | |
1072 | } | |
66cb2fde LP |
1073 | |
1074 | int openpt_in_namespace(pid_t pid, int flags) { | |
1075 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1076 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
66cb2fde LP |
1077 | pid_t child; |
1078 | int r; | |
1079 | ||
1080 | assert(pid > 0); | |
1081 | ||
1082 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1083 | if (r < 0) | |
1084 | return r; | |
1085 | ||
1086 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1087 | return -errno; | |
1088 | ||
4c253ed1 LP |
1089 | r = safe_fork("(sd-openpt)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child); |
1090 | if (r < 0) | |
1091 | return r; | |
1092 | if (r == 0) { | |
66cb2fde LP |
1093 | int master; |
1094 | ||
1095 | pair[0] = safe_close(pair[0]); | |
1096 | ||
1097 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1098 | if (r < 0) | |
1099 | _exit(EXIT_FAILURE); | |
1100 | ||
1101 | master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1102 | if (master < 0) | |
1103 | _exit(EXIT_FAILURE); | |
1104 | ||
1105 | if (unlockpt(master) < 0) | |
1106 | _exit(EXIT_FAILURE); | |
1107 | ||
1108 | if (send_one_fd(pair[1], master, 0) < 0) | |
1109 | _exit(EXIT_FAILURE); | |
1110 | ||
1111 | _exit(EXIT_SUCCESS); | |
1112 | } | |
1113 | ||
1114 | pair[1] = safe_close(pair[1]); | |
1115 | ||
2e87a1fd | 1116 | r = wait_for_terminate_and_check("(sd-openpt)", child, 0); |
66cb2fde LP |
1117 | if (r < 0) |
1118 | return r; | |
2e87a1fd | 1119 | if (r != EXIT_SUCCESS) |
66cb2fde LP |
1120 | return -EIO; |
1121 | ||
1122 | return receive_one_fd(pair[0], 0); | |
1123 | } | |
40e1f4ea LP |
1124 | |
1125 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1126 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1127 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
40e1f4ea LP |
1128 | pid_t child; |
1129 | int r; | |
1130 | ||
1131 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1132 | if (r < 0) | |
1133 | return r; | |
1134 | ||
1135 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1136 | return -errno; | |
1137 | ||
4c253ed1 LP |
1138 | r = safe_fork("(sd-terminal)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child); |
1139 | if (r < 0) | |
1140 | return r; | |
1141 | if (r == 0) { | |
40e1f4ea LP |
1142 | int master; |
1143 | ||
1144 | pair[0] = safe_close(pair[0]); | |
1145 | ||
1146 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1147 | if (r < 0) | |
1148 | _exit(EXIT_FAILURE); | |
1149 | ||
1150 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); | |
1151 | if (master < 0) | |
1152 | _exit(EXIT_FAILURE); | |
1153 | ||
1154 | if (send_one_fd(pair[1], master, 0) < 0) | |
1155 | _exit(EXIT_FAILURE); | |
1156 | ||
1157 | _exit(EXIT_SUCCESS); | |
1158 | } | |
1159 | ||
1160 | pair[1] = safe_close(pair[1]); | |
1161 | ||
2e87a1fd | 1162 | r = wait_for_terminate_and_check("(sd-terminal)", child, 0); |
40e1f4ea LP |
1163 | if (r < 0) |
1164 | return r; | |
2e87a1fd | 1165 | if (r != EXIT_SUCCESS) |
40e1f4ea LP |
1166 | return -EIO; |
1167 | ||
1168 | return receive_one_fd(pair[0], 0); | |
1169 | } | |
40c9fe4c | 1170 | |
158fbf76 | 1171 | static bool getenv_terminal_is_dumb(void) { |
ac96418b LP |
1172 | const char *e; |
1173 | ||
ac96418b LP |
1174 | e = getenv("TERM"); |
1175 | if (!e) | |
1176 | return true; | |
1177 | ||
1178 | return streq(e, "dumb"); | |
1179 | } | |
1180 | ||
158fbf76 ZJS |
1181 | bool terminal_is_dumb(void) { |
1182 | if (!on_tty()) | |
1183 | return true; | |
1184 | ||
1185 | return getenv_terminal_is_dumb(); | |
1186 | } | |
1187 | ||
40c9fe4c | 1188 | bool colors_enabled(void) { |
40c9fe4c | 1189 | |
0295642d | 1190 | /* Returns true if colors are considered supported on our stdout. For that we check $SYSTEMD_COLORS first |
f95dbcc2 | 1191 | * (which is the explicit way to turn colors on/off). If that didn't work we turn colors off unless we are on a |
0295642d LP |
1192 | * 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 |
1193 | * we are PID 1 then we do not check whether we are connected to a TTY, because we don't keep /dev/console open | |
1194 | * continously due to fear of SAK, and hence things are a bit weird. */ | |
1195 | ||
c6063244 | 1196 | if (cached_colors_enabled < 0) { |
acf553b0 | 1197 | int val; |
ae5b3958 | 1198 | |
acf553b0 ZJS |
1199 | val = getenv_bool("SYSTEMD_COLORS"); |
1200 | if (val >= 0) | |
c6063244 | 1201 | cached_colors_enabled = val; |
df0ff127 | 1202 | else if (getpid_cached() == 1) |
158fbf76 | 1203 | /* PID1 outputs to the console without holding it open all the time */ |
c6063244 | 1204 | cached_colors_enabled = !getenv_terminal_is_dumb(); |
ae5b3958 | 1205 | else |
c6063244 | 1206 | cached_colors_enabled = !terminal_is_dumb(); |
40c9fe4c JS |
1207 | } |
1208 | ||
c6063244 | 1209 | return cached_colors_enabled; |
40c9fe4c | 1210 | } |
c83f349c | 1211 | |
c2b32159 LP |
1212 | bool dev_console_colors_enabled(void) { |
1213 | _cleanup_free_ char *s = NULL; | |
1214 | int b; | |
1215 | ||
1216 | /* Returns true if we assume that color is supported on /dev/console. | |
1217 | * | |
1218 | * For that we first check if we explicitly got told to use colors or not, by checking $SYSTEMD_COLORS. If that | |
f95dbcc2 ZJS |
1219 | * isn't set we check whether PID 1 has $TERM set, and if not, whether TERM is set on the kernel command |
1220 | * line. If we find $TERM set we assume color if it's not set to "dumb", similarly to how regular | |
c2b32159 LP |
1221 | * colors_enabled() operates. */ |
1222 | ||
1223 | b = getenv_bool("SYSTEMD_COLORS"); | |
1224 | if (b >= 0) | |
1225 | return b; | |
1226 | ||
1227 | if (getenv_for_pid(1, "TERM", &s) <= 0) | |
1228 | (void) proc_cmdline_get_key("TERM", 0, &s); | |
1229 | ||
1230 | return !streq_ptr(s, "dumb"); | |
1231 | } | |
1232 | ||
526664f6 | 1233 | bool underline_enabled(void) { |
526664f6 | 1234 | |
c6063244 | 1235 | if (cached_underline_enabled < 0) { |
526664f6 LP |
1236 | |
1237 | /* The Linux console doesn't support underlining, turn it off, but only there. */ | |
1238 | ||
c6063244 LP |
1239 | if (colors_enabled()) |
1240 | cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux"); | |
526664f6 | 1241 | else |
c6063244 | 1242 | cached_underline_enabled = false; |
526664f6 LP |
1243 | } |
1244 | ||
c6063244 | 1245 | return cached_underline_enabled; |
526664f6 LP |
1246 | } |
1247 | ||
c83f349c LP |
1248 | int vt_default_utf8(void) { |
1249 | _cleanup_free_ char *b = NULL; | |
1250 | int r; | |
1251 | ||
1252 | /* Read the default VT UTF8 setting from the kernel */ | |
1253 | ||
1254 | r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b); | |
1255 | if (r < 0) | |
1256 | return r; | |
1257 | ||
1258 | return parse_boolean(b); | |
1259 | } | |
1260 | ||
1261 | int vt_reset_keyboard(int fd) { | |
1262 | int kb; | |
1263 | ||
1264 | /* If we can't read the default, then default to unicode. It's 2017 after all. */ | |
1265 | kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE; | |
1266 | ||
1267 | if (ioctl(fd, KDSKBMODE, kb) < 0) | |
1268 | return -errno; | |
1269 | ||
1270 | return 0; | |
1271 | } |