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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
0b452006 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 | ||
4f5dd394 | 21 | #include <ctype.h> |
0b452006 | 22 | #include <errno.h> |
11c3a366 TA |
23 | #include <limits.h> |
24 | #include <linux/oom.h> | |
7b3e062c | 25 | #include <sched.h> |
0b452006 | 26 | #include <signal.h> |
4f5dd394 LP |
27 | #include <stdbool.h> |
28 | #include <stdio.h> | |
35bbbf85 | 29 | #include <stdio_ext.h> |
11c3a366 | 30 | #include <stdlib.h> |
4f5dd394 | 31 | #include <string.h> |
9bfaffd5 | 32 | #include <sys/mman.h> |
7b3e062c | 33 | #include <sys/personality.h> |
405f8907 | 34 | #include <sys/prctl.h> |
4f5dd394 LP |
35 | #include <sys/types.h> |
36 | #include <sys/wait.h> | |
11c3a366 | 37 | #include <syslog.h> |
4f5dd394 | 38 | #include <unistd.h> |
349cc4a5 | 39 | #if HAVE_VALGRIND_VALGRIND_H |
dcadc967 EV |
40 | #include <valgrind/valgrind.h> |
41 | #endif | |
0b452006 | 42 | |
b5efdb8a | 43 | #include "alloc-util.h" |
6e5f1b57 | 44 | #include "architecture.h" |
4f5dd394 | 45 | #include "escape.h" |
3ffd4af2 | 46 | #include "fd-util.h" |
0b452006 | 47 | #include "fileio.h" |
f4f15635 | 48 | #include "fs-util.h" |
7b3e062c | 49 | #include "ioprio.h" |
0b452006 | 50 | #include "log.h" |
11c3a366 TA |
51 | #include "macro.h" |
52 | #include "missing.h" | |
93cc7779 | 53 | #include "process-util.h" |
8869a0b4 | 54 | #include "raw-clone.h" |
93cc7779 | 55 | #include "signal-util.h" |
1359fffa | 56 | #include "stat-util.h" |
7b3e062c | 57 | #include "string-table.h" |
07630cea | 58 | #include "string-util.h" |
4c253ed1 | 59 | #include "terminal-util.h" |
b1d4f8e1 | 60 | #include "user-util.h" |
4f5dd394 | 61 | #include "util.h" |
0b452006 RC |
62 | |
63 | int get_process_state(pid_t pid) { | |
64 | const char *p; | |
65 | char state; | |
66 | int r; | |
67 | _cleanup_free_ char *line = NULL; | |
68 | ||
69 | assert(pid >= 0); | |
70 | ||
71 | p = procfs_file_alloca(pid, "stat"); | |
a644184a | 72 | |
0b452006 | 73 | r = read_one_line_file(p, &line); |
a644184a LP |
74 | if (r == -ENOENT) |
75 | return -ESRCH; | |
0b452006 RC |
76 | if (r < 0) |
77 | return r; | |
78 | ||
79 | p = strrchr(line, ')'); | |
80 | if (!p) | |
81 | return -EIO; | |
82 | ||
83 | p++; | |
84 | ||
85 | if (sscanf(p, " %c", &state) != 1) | |
86 | return -EIO; | |
87 | ||
88 | return (unsigned char) state; | |
89 | } | |
90 | ||
91 | int get_process_comm(pid_t pid, char **name) { | |
92 | const char *p; | |
93 | int r; | |
94 | ||
95 | assert(name); | |
96 | assert(pid >= 0); | |
97 | ||
98 | p = procfs_file_alloca(pid, "comm"); | |
99 | ||
100 | r = read_one_line_file(p, name); | |
101 | if (r == -ENOENT) | |
102 | return -ESRCH; | |
103 | ||
104 | return r; | |
105 | } | |
106 | ||
107 | int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) { | |
108 | _cleanup_fclose_ FILE *f = NULL; | |
ba4cd7e2 | 109 | bool space = false; |
c0534780 | 110 | char *k, *ans = NULL; |
0b452006 RC |
111 | const char *p; |
112 | int c; | |
113 | ||
114 | assert(line); | |
115 | assert(pid >= 0); | |
116 | ||
69281c49 LP |
117 | /* Retrieves a process' command line. Replaces unprintable characters while doing so by whitespace (coalescing |
118 | * multiple sequential ones into one). If max_length is != 0 will return a string of the specified size at most | |
119 | * (the trailing NUL byte does count towards the length here!), abbreviated with a "..." ellipsis. If | |
120 | * comm_fallback is true and the process has no command line set (the case for kernel threads), or has a | |
121 | * command line that resolves to the empty string will return the "comm" name of the process instead. | |
122 | * | |
123 | * Returns -ESRCH if the process doesn't exist, and -ENOENT if the process has no command line (and | |
c0534780 | 124 | * comm_fallback is false). Returns 0 and sets *line otherwise. */ |
69281c49 | 125 | |
0b452006 RC |
126 | p = procfs_file_alloca(pid, "cmdline"); |
127 | ||
128 | f = fopen(p, "re"); | |
a644184a LP |
129 | if (!f) { |
130 | if (errno == ENOENT) | |
131 | return -ESRCH; | |
0b452006 | 132 | return -errno; |
a644184a | 133 | } |
0b452006 | 134 | |
35bbbf85 LP |
135 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
136 | ||
69281c49 LP |
137 | if (max_length == 1) { |
138 | ||
139 | /* If there's only room for one byte, return the empty string */ | |
c0534780 ZJS |
140 | ans = new0(char, 1); |
141 | if (!ans) | |
69281c49 LP |
142 | return -ENOMEM; |
143 | ||
c0534780 | 144 | *line = ans; |
69281c49 LP |
145 | return 0; |
146 | ||
147 | } else if (max_length == 0) { | |
0b452006 RC |
148 | size_t len = 0, allocated = 0; |
149 | ||
150 | while ((c = getc(f)) != EOF) { | |
151 | ||
c0534780 ZJS |
152 | if (!GREEDY_REALLOC(ans, allocated, len+3)) { |
153 | free(ans); | |
0b452006 RC |
154 | return -ENOMEM; |
155 | } | |
156 | ||
ba4cd7e2 MP |
157 | if (isprint(c)) { |
158 | if (space) { | |
c0534780 | 159 | ans[len++] = ' '; |
ba4cd7e2 MP |
160 | space = false; |
161 | } | |
162 | ||
c0534780 | 163 | ans[len++] = c; |
69281c49 | 164 | } else if (len > 0) |
ba4cd7e2 MP |
165 | space = true; |
166 | } | |
0b452006 RC |
167 | |
168 | if (len > 0) | |
c0534780 | 169 | ans[len] = '\0'; |
b09df4e2 | 170 | else |
c0534780 | 171 | ans = mfree(ans); |
0b452006 RC |
172 | |
173 | } else { | |
69281c49 | 174 | bool dotdotdot = false; |
0b452006 RC |
175 | size_t left; |
176 | ||
c0534780 ZJS |
177 | ans = new(char, max_length); |
178 | if (!ans) | |
0b452006 RC |
179 | return -ENOMEM; |
180 | ||
c0534780 | 181 | k = ans; |
0b452006 RC |
182 | left = max_length; |
183 | while ((c = getc(f)) != EOF) { | |
184 | ||
185 | if (isprint(c)) { | |
69281c49 | 186 | |
0b452006 | 187 | if (space) { |
69281c49 LP |
188 | if (left <= 2) { |
189 | dotdotdot = true; | |
0b452006 | 190 | break; |
69281c49 | 191 | } |
0b452006 RC |
192 | |
193 | *(k++) = ' '; | |
194 | left--; | |
195 | space = false; | |
196 | } | |
197 | ||
69281c49 LP |
198 | if (left <= 1) { |
199 | dotdotdot = true; | |
0b452006 | 200 | break; |
69281c49 | 201 | } |
0b452006 RC |
202 | |
203 | *(k++) = (char) c; | |
204 | left--; | |
c0534780 | 205 | } else if (k > ans) |
0b452006 RC |
206 | space = true; |
207 | } | |
208 | ||
69281c49 LP |
209 | if (dotdotdot) { |
210 | if (max_length <= 4) { | |
c0534780 | 211 | k = ans; |
69281c49 LP |
212 | left = max_length; |
213 | } else { | |
c0534780 | 214 | k = ans + max_length - 4; |
69281c49 LP |
215 | left = 4; |
216 | ||
217 | /* Eat up final spaces */ | |
c0534780 | 218 | while (k > ans && isspace(k[-1])) { |
69281c49 LP |
219 | k--; |
220 | left++; | |
221 | } | |
222 | } | |
223 | ||
224 | strncpy(k, "...", left-1); | |
b09df4e2 | 225 | k[left-1] = 0; |
0b452006 RC |
226 | } else |
227 | *k = 0; | |
228 | } | |
229 | ||
230 | /* Kernel threads have no argv[] */ | |
c0534780 | 231 | if (isempty(ans)) { |
0b452006 RC |
232 | _cleanup_free_ char *t = NULL; |
233 | int h; | |
234 | ||
c0534780 | 235 | free(ans); |
0b452006 RC |
236 | |
237 | if (!comm_fallback) | |
238 | return -ENOENT; | |
239 | ||
240 | h = get_process_comm(pid, &t); | |
241 | if (h < 0) | |
242 | return h; | |
243 | ||
69281c49 | 244 | if (max_length == 0) |
c0534780 | 245 | ans = strjoin("[", t, "]"); |
69281c49 LP |
246 | else { |
247 | size_t l; | |
248 | ||
249 | l = strlen(t); | |
250 | ||
251 | if (l + 3 <= max_length) | |
c0534780 | 252 | ans = strjoin("[", t, "]"); |
69281c49 LP |
253 | else if (max_length <= 6) { |
254 | ||
c0534780 ZJS |
255 | ans = new(char, max_length); |
256 | if (!ans) | |
69281c49 LP |
257 | return -ENOMEM; |
258 | ||
c0534780 ZJS |
259 | memcpy(ans, "[...]", max_length-1); |
260 | ans[max_length-1] = 0; | |
69281c49 LP |
261 | } else { |
262 | char *e; | |
263 | ||
264 | t[max_length - 6] = 0; | |
265 | ||
266 | /* Chop off final spaces */ | |
267 | e = strchr(t, 0); | |
268 | while (e > t && isspace(e[-1])) | |
269 | e--; | |
270 | *e = 0; | |
271 | ||
c0534780 | 272 | ans = strjoin("[", t, "...]"); |
69281c49 LP |
273 | } |
274 | } | |
c0534780 | 275 | if (!ans) |
0b452006 RC |
276 | return -ENOMEM; |
277 | } | |
278 | ||
c0534780 | 279 | *line = ans; |
0b452006 RC |
280 | return 0; |
281 | } | |
282 | ||
9bfaffd5 LP |
283 | int rename_process(const char name[]) { |
284 | static size_t mm_size = 0; | |
285 | static char *mm = NULL; | |
286 | bool truncated = false; | |
287 | size_t l; | |
288 | ||
289 | /* This is a like a poor man's setproctitle(). It changes the comm field, argv[0], and also the glibc's | |
290 | * internally used name of the process. For the first one a limit of 16 chars applies; to the second one in | |
291 | * many cases one of 10 (i.e. length of "/sbin/init") — however if we have CAP_SYS_RESOURCES it is unbounded; | |
292 | * to the third one 7 (i.e. the length of "systemd". If you pass a longer string it will likely be | |
293 | * truncated. | |
294 | * | |
295 | * Returns 0 if a name was set but truncated, > 0 if it was set but not truncated. */ | |
296 | ||
297 | if (isempty(name)) | |
298 | return -EINVAL; /* let's not confuse users unnecessarily with an empty name */ | |
405f8907 | 299 | |
9bfaffd5 | 300 | l = strlen(name); |
405f8907 | 301 | |
9bfaffd5 | 302 | /* First step, change the comm field. */ |
79d62972 | 303 | (void) prctl(PR_SET_NAME, name); |
9bfaffd5 LP |
304 | if (l > 15) /* Linux process names can be 15 chars at max */ |
305 | truncated = true; | |
306 | ||
307 | /* Second step, change glibc's ID of the process name. */ | |
308 | if (program_invocation_name) { | |
309 | size_t k; | |
310 | ||
311 | k = strlen(program_invocation_name); | |
312 | strncpy(program_invocation_name, name, k); | |
313 | if (l > k) | |
314 | truncated = true; | |
315 | } | |
316 | ||
317 | /* Third step, completely replace the argv[] array the kernel maintains for us. This requires privileges, but | |
318 | * has the advantage that the argv[] array is exactly what we want it to be, and not filled up with zeros at | |
13e785f7 | 319 | * the end. This is the best option for changing /proc/self/cmdline. */ |
01f989c6 JW |
320 | |
321 | /* Let's not bother with this if we don't have euid == 0. Strictly speaking we should check for the | |
322 | * CAP_SYS_RESOURCE capability which is independent of the euid. In our own code the capability generally is | |
323 | * present only for euid == 0, hence let's use this as quick bypass check, to avoid calling mmap() if | |
324 | * PR_SET_MM_ARG_{START,END} fails with EPERM later on anyway. After all geteuid() is dead cheap to call, but | |
325 | * mmap() is not. */ | |
326 | if (geteuid() != 0) | |
327 | log_debug("Skipping PR_SET_MM, as we don't have privileges."); | |
328 | else if (mm_size < l+1) { | |
9bfaffd5 LP |
329 | size_t nn_size; |
330 | char *nn; | |
331 | ||
9bfaffd5 LP |
332 | nn_size = PAGE_ALIGN(l+1); |
333 | nn = mmap(NULL, nn_size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
334 | if (nn == MAP_FAILED) { | |
335 | log_debug_errno(errno, "mmap() failed: %m"); | |
336 | goto use_saved_argv; | |
337 | } | |
405f8907 | 338 | |
9bfaffd5 LP |
339 | strncpy(nn, name, nn_size); |
340 | ||
341 | /* Now, let's tell the kernel about this new memory */ | |
342 | if (prctl(PR_SET_MM, PR_SET_MM_ARG_START, (unsigned long) nn, 0, 0) < 0) { | |
343 | log_debug_errno(errno, "PR_SET_MM_ARG_START failed, proceeding without: %m"); | |
344 | (void) munmap(nn, nn_size); | |
345 | goto use_saved_argv; | |
346 | } | |
347 | ||
348 | /* And update the end pointer to the new end, too. If this fails, we don't really know what to do, it's | |
349 | * pretty unlikely that we can rollback, hence we'll just accept the failure, and continue. */ | |
350 | if (prctl(PR_SET_MM, PR_SET_MM_ARG_END, (unsigned long) nn + l + 1, 0, 0) < 0) | |
351 | log_debug_errno(errno, "PR_SET_MM_ARG_END failed, proceeding without: %m"); | |
352 | ||
353 | if (mm) | |
354 | (void) munmap(mm, mm_size); | |
355 | ||
356 | mm = nn; | |
357 | mm_size = nn_size; | |
01f989c6 | 358 | } else { |
9bfaffd5 LP |
359 | strncpy(mm, name, mm_size); |
360 | ||
01f989c6 JW |
361 | /* Update the end pointer, continuing regardless of any failure. */ |
362 | if (prctl(PR_SET_MM, PR_SET_MM_ARG_END, (unsigned long) mm + l + 1, 0, 0) < 0) | |
363 | log_debug_errno(errno, "PR_SET_MM_ARG_END failed, proceeding without: %m"); | |
364 | } | |
365 | ||
9bfaffd5 LP |
366 | use_saved_argv: |
367 | /* Fourth step: in all cases we'll also update the original argv[], so that our own code gets it right too if | |
368 | * it still looks here */ | |
405f8907 LP |
369 | |
370 | if (saved_argc > 0) { | |
371 | int i; | |
372 | ||
9bfaffd5 LP |
373 | if (saved_argv[0]) { |
374 | size_t k; | |
375 | ||
376 | k = strlen(saved_argv[0]); | |
377 | strncpy(saved_argv[0], name, k); | |
378 | if (l > k) | |
379 | truncated = true; | |
380 | } | |
405f8907 LP |
381 | |
382 | for (i = 1; i < saved_argc; i++) { | |
383 | if (!saved_argv[i]) | |
384 | break; | |
385 | ||
386 | memzero(saved_argv[i], strlen(saved_argv[i])); | |
387 | } | |
388 | } | |
9bfaffd5 LP |
389 | |
390 | return !truncated; | |
405f8907 LP |
391 | } |
392 | ||
0b452006 RC |
393 | int is_kernel_thread(pid_t pid) { |
394 | const char *p; | |
395 | size_t count; | |
396 | char c; | |
397 | bool eof; | |
398 | FILE *f; | |
399 | ||
4c701096 | 400 | if (IN_SET(pid, 0, 1) || pid == getpid_cached()) /* pid 1, and we ourselves certainly aren't a kernel thread */ |
0b452006 RC |
401 | return 0; |
402 | ||
a6149b93 | 403 | assert(pid > 1); |
0b452006 RC |
404 | |
405 | p = procfs_file_alloca(pid, "cmdline"); | |
406 | f = fopen(p, "re"); | |
a644184a LP |
407 | if (!f) { |
408 | if (errno == ENOENT) | |
409 | return -ESRCH; | |
0b452006 | 410 | return -errno; |
a644184a | 411 | } |
0b452006 | 412 | |
35bbbf85 LP |
413 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
414 | ||
0b452006 RC |
415 | count = fread(&c, 1, 1, f); |
416 | eof = feof(f); | |
417 | fclose(f); | |
418 | ||
419 | /* Kernel threads have an empty cmdline */ | |
420 | ||
421 | if (count <= 0) | |
422 | return eof ? 1 : -errno; | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | int get_process_capeff(pid_t pid, char **capeff) { | |
428 | const char *p; | |
a644184a | 429 | int r; |
0b452006 RC |
430 | |
431 | assert(capeff); | |
432 | assert(pid >= 0); | |
433 | ||
434 | p = procfs_file_alloca(pid, "status"); | |
435 | ||
c4cd1d4d | 436 | r = get_proc_field(p, "CapEff", WHITESPACE, capeff); |
a644184a LP |
437 | if (r == -ENOENT) |
438 | return -ESRCH; | |
439 | ||
440 | return r; | |
0b452006 RC |
441 | } |
442 | ||
443 | static int get_process_link_contents(const char *proc_file, char **name) { | |
444 | int r; | |
445 | ||
446 | assert(proc_file); | |
447 | assert(name); | |
448 | ||
449 | r = readlink_malloc(proc_file, name); | |
a644184a LP |
450 | if (r == -ENOENT) |
451 | return -ESRCH; | |
0b452006 | 452 | if (r < 0) |
a644184a | 453 | return r; |
0b452006 RC |
454 | |
455 | return 0; | |
456 | } | |
457 | ||
458 | int get_process_exe(pid_t pid, char **name) { | |
459 | const char *p; | |
460 | char *d; | |
461 | int r; | |
462 | ||
463 | assert(pid >= 0); | |
464 | ||
465 | p = procfs_file_alloca(pid, "exe"); | |
466 | r = get_process_link_contents(p, name); | |
467 | if (r < 0) | |
468 | return r; | |
469 | ||
470 | d = endswith(*name, " (deleted)"); | |
471 | if (d) | |
472 | *d = '\0'; | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | static int get_process_id(pid_t pid, const char *field, uid_t *uid) { | |
478 | _cleanup_fclose_ FILE *f = NULL; | |
479 | char line[LINE_MAX]; | |
480 | const char *p; | |
481 | ||
482 | assert(field); | |
483 | assert(uid); | |
484 | ||
07b38ba5 | 485 | if (pid < 0) |
6f8cbcdb LP |
486 | return -EINVAL; |
487 | ||
0b452006 RC |
488 | p = procfs_file_alloca(pid, "status"); |
489 | f = fopen(p, "re"); | |
a644184a LP |
490 | if (!f) { |
491 | if (errno == ENOENT) | |
492 | return -ESRCH; | |
0b452006 | 493 | return -errno; |
a644184a | 494 | } |
0b452006 | 495 | |
35bbbf85 LP |
496 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
497 | ||
0b452006 RC |
498 | FOREACH_LINE(line, f, return -errno) { |
499 | char *l; | |
500 | ||
501 | l = strstrip(line); | |
502 | ||
503 | if (startswith(l, field)) { | |
504 | l += strlen(field); | |
505 | l += strspn(l, WHITESPACE); | |
506 | ||
507 | l[strcspn(l, WHITESPACE)] = 0; | |
508 | ||
509 | return parse_uid(l, uid); | |
510 | } | |
511 | } | |
512 | ||
513 | return -EIO; | |
514 | } | |
515 | ||
516 | int get_process_uid(pid_t pid, uid_t *uid) { | |
6f8cbcdb LP |
517 | |
518 | if (pid == 0 || pid == getpid_cached()) { | |
519 | *uid = getuid(); | |
520 | return 0; | |
521 | } | |
522 | ||
0b452006 RC |
523 | return get_process_id(pid, "Uid:", uid); |
524 | } | |
525 | ||
526 | int get_process_gid(pid_t pid, gid_t *gid) { | |
6f8cbcdb LP |
527 | |
528 | if (pid == 0 || pid == getpid_cached()) { | |
529 | *gid = getgid(); | |
530 | return 0; | |
531 | } | |
532 | ||
0b452006 RC |
533 | assert_cc(sizeof(uid_t) == sizeof(gid_t)); |
534 | return get_process_id(pid, "Gid:", gid); | |
535 | } | |
536 | ||
537 | int get_process_cwd(pid_t pid, char **cwd) { | |
538 | const char *p; | |
539 | ||
540 | assert(pid >= 0); | |
541 | ||
542 | p = procfs_file_alloca(pid, "cwd"); | |
543 | ||
544 | return get_process_link_contents(p, cwd); | |
545 | } | |
546 | ||
547 | int get_process_root(pid_t pid, char **root) { | |
548 | const char *p; | |
549 | ||
550 | assert(pid >= 0); | |
551 | ||
552 | p = procfs_file_alloca(pid, "root"); | |
553 | ||
554 | return get_process_link_contents(p, root); | |
555 | } | |
556 | ||
557 | int get_process_environ(pid_t pid, char **env) { | |
558 | _cleanup_fclose_ FILE *f = NULL; | |
559 | _cleanup_free_ char *outcome = NULL; | |
560 | int c; | |
561 | const char *p; | |
562 | size_t allocated = 0, sz = 0; | |
563 | ||
564 | assert(pid >= 0); | |
565 | assert(env); | |
566 | ||
567 | p = procfs_file_alloca(pid, "environ"); | |
568 | ||
569 | f = fopen(p, "re"); | |
a644184a LP |
570 | if (!f) { |
571 | if (errno == ENOENT) | |
572 | return -ESRCH; | |
0b452006 | 573 | return -errno; |
a644184a | 574 | } |
0b452006 | 575 | |
35bbbf85 LP |
576 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
577 | ||
0b452006 RC |
578 | while ((c = fgetc(f)) != EOF) { |
579 | if (!GREEDY_REALLOC(outcome, allocated, sz + 5)) | |
580 | return -ENOMEM; | |
581 | ||
582 | if (c == '\0') | |
583 | outcome[sz++] = '\n'; | |
584 | else | |
585 | sz += cescape_char(c, outcome + sz); | |
586 | } | |
587 | ||
03c55bc0 LP |
588 | if (!outcome) { |
589 | outcome = strdup(""); | |
590 | if (!outcome) | |
591 | return -ENOMEM; | |
592 | } else | |
593 | outcome[sz] = '\0'; | |
de8763b6 | 594 | |
0b452006 RC |
595 | *env = outcome; |
596 | outcome = NULL; | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
6bc73acb | 601 | int get_process_ppid(pid_t pid, pid_t *_ppid) { |
0b452006 RC |
602 | int r; |
603 | _cleanup_free_ char *line = NULL; | |
604 | long unsigned ppid; | |
605 | const char *p; | |
606 | ||
607 | assert(pid >= 0); | |
608 | assert(_ppid); | |
609 | ||
6f8cbcdb | 610 | if (pid == 0 || pid == getpid_cached()) { |
0b452006 RC |
611 | *_ppid = getppid(); |
612 | return 0; | |
613 | } | |
614 | ||
615 | p = procfs_file_alloca(pid, "stat"); | |
616 | r = read_one_line_file(p, &line); | |
a644184a LP |
617 | if (r == -ENOENT) |
618 | return -ESRCH; | |
0b452006 RC |
619 | if (r < 0) |
620 | return r; | |
621 | ||
622 | /* Let's skip the pid and comm fields. The latter is enclosed | |
623 | * in () but does not escape any () in its value, so let's | |
624 | * skip over it manually */ | |
625 | ||
626 | p = strrchr(line, ')'); | |
627 | if (!p) | |
628 | return -EIO; | |
629 | ||
630 | p++; | |
631 | ||
632 | if (sscanf(p, " " | |
633 | "%*c " /* state */ | |
634 | "%lu ", /* ppid */ | |
635 | &ppid) != 1) | |
636 | return -EIO; | |
637 | ||
638 | if ((long unsigned) (pid_t) ppid != ppid) | |
639 | return -ERANGE; | |
640 | ||
641 | *_ppid = (pid_t) ppid; | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
646 | int wait_for_terminate(pid_t pid, siginfo_t *status) { | |
647 | siginfo_t dummy; | |
648 | ||
649 | assert(pid >= 1); | |
650 | ||
651 | if (!status) | |
652 | status = &dummy; | |
653 | ||
654 | for (;;) { | |
655 | zero(*status); | |
656 | ||
657 | if (waitid(P_PID, pid, status, WEXITED) < 0) { | |
658 | ||
659 | if (errno == EINTR) | |
660 | continue; | |
661 | ||
3f0083a2 | 662 | return negative_errno(); |
0b452006 RC |
663 | } |
664 | ||
665 | return 0; | |
666 | } | |
667 | } | |
668 | ||
669 | /* | |
670 | * Return values: | |
671 | * < 0 : wait_for_terminate() failed to get the state of the | |
672 | * process, the process was terminated by a signal, or | |
673 | * failed for an unknown reason. | |
674 | * >=0 : The process terminated normally, and its exit code is | |
675 | * returned. | |
676 | * | |
677 | * That is, success is indicated by a return value of zero, and an | |
678 | * error is indicated by a non-zero value. | |
679 | * | |
680 | * A warning is emitted if the process terminates abnormally, | |
681 | * and also if it returns non-zero unless check_exit_code is true. | |
682 | */ | |
683 | int wait_for_terminate_and_warn(const char *name, pid_t pid, bool check_exit_code) { | |
684 | int r; | |
685 | siginfo_t status; | |
686 | ||
687 | assert(name); | |
688 | assert(pid > 1); | |
689 | ||
690 | r = wait_for_terminate(pid, &status); | |
691 | if (r < 0) | |
692 | return log_warning_errno(r, "Failed to wait for %s: %m", name); | |
693 | ||
694 | if (status.si_code == CLD_EXITED) { | |
695 | if (status.si_status != 0) | |
696 | log_full(check_exit_code ? LOG_WARNING : LOG_DEBUG, | |
697 | "%s failed with error code %i.", name, status.si_status); | |
698 | else | |
699 | log_debug("%s succeeded.", name); | |
700 | ||
701 | return status.si_status; | |
3742095b | 702 | } else if (IN_SET(status.si_code, CLD_KILLED, CLD_DUMPED)) { |
0b452006 RC |
703 | |
704 | log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status)); | |
705 | return -EPROTO; | |
706 | } | |
707 | ||
708 | log_warning("%s failed due to unknown reason.", name); | |
709 | return -EPROTO; | |
710 | } | |
711 | ||
d5641e0d KW |
712 | /* |
713 | * Return values: | |
714 | * < 0 : wait_for_terminate_with_timeout() failed to get the state of the | |
715 | * process, the process timed out, the process was terminated by a | |
716 | * signal, or failed for an unknown reason. | |
717 | * >=0 : The process terminated normally with no failures. | |
718 | * | |
719 | * Success is indicated by a return value of zero, a timeout is indicated | |
720 | * by ETIMEDOUT, and all other child failure states are indicated by error | |
721 | * is indicated by a non-zero value. | |
722 | */ | |
723 | int wait_for_terminate_with_timeout(pid_t pid, usec_t timeout) { | |
724 | sigset_t mask; | |
725 | int r; | |
726 | usec_t until; | |
727 | ||
728 | assert_se(sigemptyset(&mask) == 0); | |
729 | assert_se(sigaddset(&mask, SIGCHLD) == 0); | |
730 | ||
731 | /* Drop into a sigtimewait-based timeout. Waiting for the | |
732 | * pid to exit. */ | |
733 | until = now(CLOCK_MONOTONIC) + timeout; | |
734 | for (;;) { | |
735 | usec_t n; | |
736 | siginfo_t status = {}; | |
737 | struct timespec ts; | |
738 | ||
739 | n = now(CLOCK_MONOTONIC); | |
740 | if (n >= until) | |
741 | break; | |
742 | ||
743 | r = sigtimedwait(&mask, NULL, timespec_store(&ts, until - n)) < 0 ? -errno : 0; | |
744 | /* Assuming we woke due to the child exiting. */ | |
745 | if (waitid(P_PID, pid, &status, WEXITED|WNOHANG) == 0) { | |
746 | if (status.si_pid == pid) { | |
747 | /* This is the correct child.*/ | |
748 | if (status.si_code == CLD_EXITED) | |
749 | return (status.si_status == 0) ? 0 : -EPROTO; | |
750 | else | |
751 | return -EPROTO; | |
752 | } | |
753 | } | |
754 | /* Not the child, check for errors and proceed appropriately */ | |
755 | if (r < 0) { | |
756 | switch (r) { | |
757 | case -EAGAIN: | |
758 | /* Timed out, child is likely hung. */ | |
759 | return -ETIMEDOUT; | |
760 | case -EINTR: | |
761 | /* Received a different signal and should retry */ | |
762 | continue; | |
763 | default: | |
764 | /* Return any unexpected errors */ | |
765 | return r; | |
766 | } | |
767 | } | |
768 | } | |
769 | ||
770 | return -EPROTO; | |
771 | } | |
772 | ||
89c9030d LP |
773 | void sigkill_wait(pid_t pid) { |
774 | assert(pid > 1); | |
775 | ||
776 | if (kill(pid, SIGKILL) > 0) | |
777 | (void) wait_for_terminate(pid, NULL); | |
778 | } | |
779 | ||
780 | void sigkill_waitp(pid_t *pid) { | |
4d0d3d41 LP |
781 | if (!pid) |
782 | return; | |
783 | if (*pid <= 1) | |
784 | return; | |
785 | ||
89c9030d | 786 | sigkill_wait(*pid); |
4d0d3d41 LP |
787 | } |
788 | ||
0b452006 RC |
789 | int kill_and_sigcont(pid_t pid, int sig) { |
790 | int r; | |
791 | ||
792 | r = kill(pid, sig) < 0 ? -errno : 0; | |
793 | ||
26f417d3 LP |
794 | /* If this worked, also send SIGCONT, unless we already just sent a SIGCONT, or SIGKILL was sent which isn't |
795 | * affected by a process being suspended anyway. */ | |
a3d8d68c | 796 | if (r >= 0 && !IN_SET(sig, SIGCONT, SIGKILL)) |
26f417d3 | 797 | (void) kill(pid, SIGCONT); |
0b452006 RC |
798 | |
799 | return r; | |
800 | } | |
801 | ||
802 | int getenv_for_pid(pid_t pid, const char *field, char **_value) { | |
803 | _cleanup_fclose_ FILE *f = NULL; | |
804 | char *value = NULL; | |
805 | int r; | |
806 | bool done = false; | |
807 | size_t l; | |
808 | const char *path; | |
809 | ||
810 | assert(pid >= 0); | |
811 | assert(field); | |
812 | assert(_value); | |
813 | ||
814 | path = procfs_file_alloca(pid, "environ"); | |
815 | ||
816 | f = fopen(path, "re"); | |
a644184a LP |
817 | if (!f) { |
818 | if (errno == ENOENT) | |
819 | return -ESRCH; | |
0b452006 | 820 | return -errno; |
a644184a | 821 | } |
0b452006 | 822 | |
35bbbf85 LP |
823 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
824 | ||
0b452006 RC |
825 | l = strlen(field); |
826 | r = 0; | |
827 | ||
828 | do { | |
829 | char line[LINE_MAX]; | |
830 | unsigned i; | |
831 | ||
832 | for (i = 0; i < sizeof(line)-1; i++) { | |
833 | int c; | |
834 | ||
835 | c = getc(f); | |
836 | if (_unlikely_(c == EOF)) { | |
837 | done = true; | |
838 | break; | |
839 | } else if (c == 0) | |
840 | break; | |
841 | ||
842 | line[i] = c; | |
843 | } | |
844 | line[i] = 0; | |
845 | ||
041b5ae1 | 846 | if (strneq(line, field, l) && line[l] == '=') { |
0b452006 RC |
847 | value = strdup(line + l + 1); |
848 | if (!value) | |
849 | return -ENOMEM; | |
850 | ||
851 | r = 1; | |
852 | break; | |
853 | } | |
854 | ||
855 | } while (!done); | |
856 | ||
857 | *_value = value; | |
858 | return r; | |
859 | } | |
860 | ||
861 | bool pid_is_unwaited(pid_t pid) { | |
862 | /* Checks whether a PID is still valid at all, including a zombie */ | |
863 | ||
07b38ba5 | 864 | if (pid < 0) |
0b452006 RC |
865 | return false; |
866 | ||
5fd9b2c5 LP |
867 | if (pid <= 1) /* If we or PID 1 would be dead and have been waited for, this code would not be running */ |
868 | return true; | |
869 | ||
6f8cbcdb LP |
870 | if (pid == getpid_cached()) |
871 | return true; | |
872 | ||
0b452006 RC |
873 | if (kill(pid, 0) >= 0) |
874 | return true; | |
875 | ||
876 | return errno != ESRCH; | |
877 | } | |
878 | ||
879 | bool pid_is_alive(pid_t pid) { | |
880 | int r; | |
881 | ||
882 | /* Checks whether a PID is still valid and not a zombie */ | |
883 | ||
07b38ba5 | 884 | if (pid < 0) |
0b452006 RC |
885 | return false; |
886 | ||
5fd9b2c5 LP |
887 | if (pid <= 1) /* If we or PID 1 would be a zombie, this code would not be running */ |
888 | return true; | |
889 | ||
6f8cbcdb LP |
890 | if (pid == getpid_cached()) |
891 | return true; | |
892 | ||
0b452006 | 893 | r = get_process_state(pid); |
4c701096 | 894 | if (IN_SET(r, -ESRCH, 'Z')) |
0b452006 RC |
895 | return false; |
896 | ||
897 | return true; | |
898 | } | |
d4510856 | 899 | |
1359fffa MS |
900 | int pid_from_same_root_fs(pid_t pid) { |
901 | const char *root; | |
902 | ||
07b38ba5 | 903 | if (pid < 0) |
6f8cbcdb LP |
904 | return false; |
905 | ||
906 | if (pid == 0 || pid == getpid_cached()) | |
907 | return true; | |
1359fffa MS |
908 | |
909 | root = procfs_file_alloca(pid, "root"); | |
910 | ||
e3f791a2 | 911 | return files_same(root, "/proc/1/root", 0); |
1359fffa MS |
912 | } |
913 | ||
d4510856 LP |
914 | bool is_main_thread(void) { |
915 | static thread_local int cached = 0; | |
916 | ||
917 | if (_unlikely_(cached == 0)) | |
df0ff127 | 918 | cached = getpid_cached() == gettid() ? 1 : -1; |
d4510856 LP |
919 | |
920 | return cached > 0; | |
921 | } | |
7b3e062c LP |
922 | |
923 | noreturn void freeze(void) { | |
924 | ||
3da48d7a EV |
925 | log_close(); |
926 | ||
7b3e062c LP |
927 | /* Make sure nobody waits for us on a socket anymore */ |
928 | close_all_fds(NULL, 0); | |
929 | ||
930 | sync(); | |
931 | ||
932 | for (;;) | |
933 | pause(); | |
934 | } | |
935 | ||
936 | bool oom_score_adjust_is_valid(int oa) { | |
937 | return oa >= OOM_SCORE_ADJ_MIN && oa <= OOM_SCORE_ADJ_MAX; | |
938 | } | |
939 | ||
940 | unsigned long personality_from_string(const char *p) { | |
6e5f1b57 | 941 | int architecture; |
7b3e062c | 942 | |
0c0fea07 LP |
943 | if (!p) |
944 | return PERSONALITY_INVALID; | |
945 | ||
6e5f1b57 LP |
946 | /* Parse a personality specifier. We use our own identifiers that indicate specific ABIs, rather than just |
947 | * hints regarding the register size, since we want to keep things open for multiple locally supported ABIs for | |
948 | * the same register size. */ | |
949 | ||
950 | architecture = architecture_from_string(p); | |
951 | if (architecture < 0) | |
952 | return PERSONALITY_INVALID; | |
7b3e062c | 953 | |
0c0fea07 | 954 | if (architecture == native_architecture()) |
7b3e062c | 955 | return PER_LINUX; |
0c0fea07 LP |
956 | #ifdef SECONDARY_ARCHITECTURE |
957 | if (architecture == SECONDARY_ARCHITECTURE) | |
f2d1736c | 958 | return PER_LINUX32; |
7b3e062c LP |
959 | #endif |
960 | ||
961 | return PERSONALITY_INVALID; | |
962 | } | |
963 | ||
964 | const char* personality_to_string(unsigned long p) { | |
6e5f1b57 | 965 | int architecture = _ARCHITECTURE_INVALID; |
7b3e062c | 966 | |
7b3e062c | 967 | if (p == PER_LINUX) |
0c0fea07 LP |
968 | architecture = native_architecture(); |
969 | #ifdef SECONDARY_ARCHITECTURE | |
6e5f1b57 | 970 | else if (p == PER_LINUX32) |
0c0fea07 | 971 | architecture = SECONDARY_ARCHITECTURE; |
7b3e062c LP |
972 | #endif |
973 | ||
6e5f1b57 LP |
974 | if (architecture < 0) |
975 | return NULL; | |
976 | ||
977 | return architecture_to_string(architecture); | |
7b3e062c LP |
978 | } |
979 | ||
21022b9d LP |
980 | int safe_personality(unsigned long p) { |
981 | int ret; | |
982 | ||
983 | /* So here's the deal, personality() is weirdly defined by glibc. In some cases it returns a failure via errno, | |
984 | * and in others as negative return value containing an errno-like value. Let's work around this: this is a | |
985 | * wrapper that uses errno if it is set, and uses the return value otherwise. And then it sets both errno and | |
986 | * the return value indicating the same issue, so that we are definitely on the safe side. | |
987 | * | |
988 | * See https://github.com/systemd/systemd/issues/6737 */ | |
989 | ||
990 | errno = 0; | |
991 | ret = personality(p); | |
992 | if (ret < 0) { | |
993 | if (errno != 0) | |
994 | return -errno; | |
995 | ||
996 | errno = -ret; | |
997 | } | |
998 | ||
999 | return ret; | |
1000 | } | |
1001 | ||
e8132d63 LP |
1002 | int opinionated_personality(unsigned long *ret) { |
1003 | int current; | |
1004 | ||
1005 | /* Returns the current personality, or PERSONALITY_INVALID if we can't determine it. This function is a bit | |
1006 | * opinionated though, and ignores all the finer-grained bits and exotic personalities, only distinguishing the | |
1007 | * two most relevant personalities: PER_LINUX and PER_LINUX32. */ | |
1008 | ||
21022b9d | 1009 | current = safe_personality(PERSONALITY_INVALID); |
e8132d63 | 1010 | if (current < 0) |
21022b9d | 1011 | return current; |
e8132d63 LP |
1012 | |
1013 | if (((unsigned long) current & 0xffff) == PER_LINUX32) | |
1014 | *ret = PER_LINUX32; | |
1015 | else | |
1016 | *ret = PER_LINUX; | |
1017 | ||
1018 | return 0; | |
1019 | } | |
1020 | ||
dcadc967 | 1021 | void valgrind_summary_hack(void) { |
349cc4a5 | 1022 | #if HAVE_VALGRIND_VALGRIND_H |
df0ff127 | 1023 | if (getpid_cached() == 1 && RUNNING_ON_VALGRIND) { |
dcadc967 | 1024 | pid_t pid; |
8869a0b4 | 1025 | pid = raw_clone(SIGCHLD); |
dcadc967 EV |
1026 | if (pid < 0) |
1027 | log_emergency_errno(errno, "Failed to fork off valgrind helper: %m"); | |
1028 | else if (pid == 0) | |
1029 | exit(EXIT_SUCCESS); | |
1030 | else { | |
1031 | log_info("Spawned valgrind helper as PID "PID_FMT".", pid); | |
1032 | (void) wait_for_terminate(pid, NULL); | |
1033 | } | |
1034 | } | |
1035 | #endif | |
1036 | } | |
1037 | ||
291d565a LP |
1038 | int pid_compare_func(const void *a, const void *b) { |
1039 | const pid_t *p = a, *q = b; | |
1040 | ||
1041 | /* Suitable for usage in qsort() */ | |
1042 | ||
1043 | if (*p < *q) | |
1044 | return -1; | |
1045 | if (*p > *q) | |
1046 | return 1; | |
1047 | return 0; | |
1048 | } | |
1049 | ||
7f452159 LP |
1050 | int ioprio_parse_priority(const char *s, int *ret) { |
1051 | int i, r; | |
1052 | ||
1053 | assert(s); | |
1054 | assert(ret); | |
1055 | ||
1056 | r = safe_atoi(s, &i); | |
1057 | if (r < 0) | |
1058 | return r; | |
1059 | ||
1060 | if (!ioprio_priority_is_valid(i)) | |
1061 | return -EINVAL; | |
1062 | ||
1063 | *ret = i; | |
1064 | return 0; | |
1065 | } | |
1066 | ||
5c30a6d2 LP |
1067 | /* The cached PID, possible values: |
1068 | * | |
1069 | * == UNSET [0] → cache not initialized yet | |
1070 | * == BUSY [-1] → some thread is initializing it at the moment | |
1071 | * any other → the cached PID | |
1072 | */ | |
1073 | ||
1074 | #define CACHED_PID_UNSET ((pid_t) 0) | |
1075 | #define CACHED_PID_BUSY ((pid_t) -1) | |
1076 | ||
1077 | static pid_t cached_pid = CACHED_PID_UNSET; | |
1078 | ||
1079 | static void reset_cached_pid(void) { | |
1080 | /* Invoked in the child after a fork(), i.e. at the first moment the PID changed */ | |
1081 | cached_pid = CACHED_PID_UNSET; | |
1082 | } | |
1083 | ||
1084 | /* We use glibc __register_atfork() + __dso_handle directly here, as they are not included in the glibc | |
1085 | * headers. __register_atfork() is mostly equivalent to pthread_atfork(), but doesn't require us to link against | |
1086 | * libpthread, as it is part of glibc anyway. */ | |
1087 | extern int __register_atfork(void (*prepare) (void), void (*parent) (void), void (*child) (void), void * __dso_handle); | |
1088 | extern void* __dso_handle __attribute__ ((__weak__)); | |
1089 | ||
1090 | pid_t getpid_cached(void) { | |
1091 | pid_t current_value; | |
1092 | ||
1093 | /* getpid_cached() is much like getpid(), but caches the value in local memory, to avoid having to invoke a | |
1094 | * system call each time. This restores glibc behaviour from before 2.24, when getpid() was unconditionally | |
1095 | * cached. Starting with 2.24 getpid() started to become prohibitively expensive when used for detecting when | |
1096 | * objects were used across fork()s. With this caching the old behaviour is somewhat restored. | |
1097 | * | |
1098 | * https://bugzilla.redhat.com/show_bug.cgi?id=1443976 | |
a4041e4f | 1099 | * https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c579f48edba88380635ab98cb612030e3ed8691e |
5c30a6d2 LP |
1100 | */ |
1101 | ||
1102 | current_value = __sync_val_compare_and_swap(&cached_pid, CACHED_PID_UNSET, CACHED_PID_BUSY); | |
1103 | ||
1104 | switch (current_value) { | |
1105 | ||
1106 | case CACHED_PID_UNSET: { /* Not initialized yet, then do so now */ | |
1107 | pid_t new_pid; | |
1108 | ||
1109 | new_pid = getpid(); | |
1110 | ||
1111 | if (__register_atfork(NULL, NULL, reset_cached_pid, __dso_handle) != 0) { | |
1112 | /* OOM? Let's try again later */ | |
1113 | cached_pid = CACHED_PID_UNSET; | |
1114 | return new_pid; | |
1115 | } | |
1116 | ||
1117 | cached_pid = new_pid; | |
1118 | return new_pid; | |
1119 | } | |
1120 | ||
1121 | case CACHED_PID_BUSY: /* Somebody else is currently initializing */ | |
1122 | return getpid(); | |
1123 | ||
1124 | default: /* Properly initialized */ | |
1125 | return current_value; | |
1126 | } | |
1127 | } | |
1128 | ||
fba868fa LP |
1129 | int must_be_root(void) { |
1130 | ||
1131 | if (geteuid() == 0) | |
1132 | return 0; | |
1133 | ||
1134 | log_error("Need to be root."); | |
1135 | return -EPERM; | |
1136 | } | |
1137 | ||
4c253ed1 LP |
1138 | int safe_fork_full( |
1139 | const char *name, | |
1140 | const int except_fds[], | |
1141 | size_t n_except_fds, | |
1142 | ForkFlags flags, | |
1143 | pid_t *ret_pid) { | |
1144 | ||
1145 | pid_t original_pid, pid; | |
1146 | sigset_t saved_ss; | |
1147 | bool block_signals; | |
1148 | int r; | |
1149 | ||
1150 | /* A wrapper around fork(), that does a couple of important initializations in addition to mere forking. Always | |
1151 | * returns the child's PID in *ret_pid. Returns == 0 in the child, and > 0 in the parent. */ | |
1152 | ||
1153 | original_pid = getpid_cached(); | |
1154 | ||
1155 | block_signals = flags & (FORK_RESET_SIGNALS|FORK_DEATHSIG); | |
1156 | ||
1157 | if (block_signals) { | |
1158 | sigset_t ss; | |
1159 | ||
1160 | /* We temporarily block all signals, so that the new child has them blocked initially. This way, we can be sure | |
1161 | * that SIGTERMs are not lost we might send to the child. */ | |
1162 | if (sigfillset(&ss) < 0) | |
1163 | return log_debug_errno(errno, "Failed to reset signal set: %m"); | |
1164 | ||
1165 | if (sigprocmask(SIG_SETMASK, &ss, &saved_ss) < 0) | |
1166 | return log_debug_errno(errno, "Failed to reset signal mask: %m"); | |
1167 | } | |
1168 | ||
1169 | pid = fork(); | |
1170 | if (pid < 0) { | |
1171 | r = -errno; | |
1172 | ||
1173 | if (block_signals) /* undo what we did above */ | |
1174 | (void) sigprocmask(SIG_SETMASK, &saved_ss, NULL); | |
1175 | ||
1176 | return log_debug_errno(r, "Failed to fork: %m"); | |
1177 | } | |
1178 | if (pid > 0) { | |
1179 | /* We are in the parent process */ | |
1180 | ||
1181 | if (block_signals) /* undo what we did above */ | |
1182 | (void) sigprocmask(SIG_SETMASK, &saved_ss, NULL); | |
1183 | ||
1184 | log_debug("Sucessfully forked off '%s' as PID " PID_FMT ".", strna(name), pid); | |
1185 | ||
1186 | if (ret_pid) | |
1187 | *ret_pid = pid; | |
1188 | ||
1189 | return 1; | |
1190 | } | |
1191 | ||
1192 | /* We are in the child process */ | |
1193 | ||
1194 | if (flags & FORK_REOPEN_LOG) { | |
1195 | /* Close the logs if requested, before we log anything. And make sure we reopen it if needed. */ | |
1196 | log_close(); | |
1197 | log_set_open_when_needed(true); | |
1198 | } | |
1199 | ||
1200 | if (name) { | |
1201 | r = rename_process(name); | |
1202 | if (r < 0) | |
1203 | log_debug_errno(r, "Failed to rename process, ignoring: %m"); | |
1204 | } | |
1205 | ||
1206 | if (flags & FORK_DEATHSIG) | |
1207 | if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) { | |
1208 | log_debug_errno(errno, "Failed to set death signal: %m"); | |
1209 | _exit(EXIT_FAILURE); | |
1210 | } | |
1211 | ||
1212 | if (flags & FORK_RESET_SIGNALS) { | |
1213 | r = reset_all_signal_handlers(); | |
1214 | if (r < 0) { | |
1215 | log_debug_errno(r, "Failed to reset signal handlers: %m"); | |
1216 | _exit(EXIT_FAILURE); | |
1217 | } | |
1218 | ||
1219 | /* This implicitly undoes the signal mask stuff we did before the fork()ing above */ | |
1220 | r = reset_signal_mask(); | |
1221 | if (r < 0) { | |
1222 | log_debug_errno(r, "Failed to reset signal mask: %m"); | |
1223 | _exit(EXIT_FAILURE); | |
1224 | } | |
1225 | } else if (block_signals) { /* undo what we did above */ | |
1226 | if (sigprocmask(SIG_SETMASK, &saved_ss, NULL) < 0) { | |
1227 | log_debug_errno(errno, "Failed to restore signal mask: %m"); | |
1228 | _exit(EXIT_FAILURE); | |
1229 | } | |
1230 | } | |
1231 | ||
1232 | if (flags & FORK_DEATHSIG) { | |
1233 | /* Let's see if the parent PID is still the one we started from? If not, then the parent | |
1234 | * already died by the time we set PR_SET_PDEATHSIG, hence let's emulate the effect */ | |
1235 | ||
1236 | if (getppid() != original_pid) { | |
1237 | log_debug("Parent died early, raising SIGTERM."); | |
1238 | (void) raise(SIGTERM); | |
1239 | _exit(EXIT_FAILURE); | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | if (flags & FORK_CLOSE_ALL_FDS) { | |
1244 | /* Close the logs here in case it got reopened above, as close_all_fds() would close them for us */ | |
1245 | log_close(); | |
1246 | ||
1247 | r = close_all_fds(except_fds, n_except_fds); | |
1248 | if (r < 0) { | |
1249 | log_debug_errno(r, "Failed to close all file descriptors: %m"); | |
1250 | _exit(EXIT_FAILURE); | |
1251 | } | |
1252 | } | |
1253 | ||
1254 | /* When we were asked to reopen the logs, do so again now */ | |
1255 | if (flags & FORK_REOPEN_LOG) { | |
1256 | log_open(); | |
1257 | log_set_open_when_needed(false); | |
1258 | } | |
1259 | ||
1260 | if (flags & FORK_NULL_STDIO) { | |
1261 | r = make_null_stdio(); | |
1262 | if (r < 0) { | |
1263 | log_debug_errno(r, "Failed to connect stdin/stdout to /dev/null: %m"); | |
1264 | _exit(EXIT_FAILURE); | |
1265 | } | |
1266 | } | |
1267 | ||
1268 | if (ret_pid) | |
1269 | *ret_pid = getpid_cached(); | |
1270 | ||
1271 | return 0; | |
1272 | } | |
1273 | ||
7b3e062c LP |
1274 | static const char *const ioprio_class_table[] = { |
1275 | [IOPRIO_CLASS_NONE] = "none", | |
1276 | [IOPRIO_CLASS_RT] = "realtime", | |
1277 | [IOPRIO_CLASS_BE] = "best-effort", | |
1278 | [IOPRIO_CLASS_IDLE] = "idle" | |
1279 | }; | |
1280 | ||
1281 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ioprio_class, int, INT_MAX); | |
1282 | ||
1283 | static const char *const sigchld_code_table[] = { | |
1284 | [CLD_EXITED] = "exited", | |
1285 | [CLD_KILLED] = "killed", | |
1286 | [CLD_DUMPED] = "dumped", | |
1287 | [CLD_TRAPPED] = "trapped", | |
1288 | [CLD_STOPPED] = "stopped", | |
1289 | [CLD_CONTINUED] = "continued", | |
1290 | }; | |
1291 | ||
1292 | DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int); | |
1293 | ||
1294 | static const char* const sched_policy_table[] = { | |
1295 | [SCHED_OTHER] = "other", | |
1296 | [SCHED_BATCH] = "batch", | |
1297 | [SCHED_IDLE] = "idle", | |
1298 | [SCHED_FIFO] = "fifo", | |
1299 | [SCHED_RR] = "rr" | |
1300 | }; | |
1301 | ||
1302 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sched_policy, int, INT_MAX); |