]>
Commit | Line | Data |
---|---|---|
0b452006 RC |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
4f5dd394 | 20 | #include <ctype.h> |
0b452006 | 21 | #include <errno.h> |
11c3a366 TA |
22 | #include <limits.h> |
23 | #include <linux/oom.h> | |
7b3e062c | 24 | #include <sched.h> |
0b452006 | 25 | #include <signal.h> |
4f5dd394 LP |
26 | #include <stdbool.h> |
27 | #include <stdio.h> | |
11c3a366 | 28 | #include <stdlib.h> |
4f5dd394 | 29 | #include <string.h> |
9bfaffd5 | 30 | #include <sys/mman.h> |
7b3e062c | 31 | #include <sys/personality.h> |
405f8907 | 32 | #include <sys/prctl.h> |
4f5dd394 LP |
33 | #include <sys/types.h> |
34 | #include <sys/wait.h> | |
11c3a366 | 35 | #include <syslog.h> |
4f5dd394 | 36 | #include <unistd.h> |
dcadc967 EV |
37 | #ifdef HAVE_VALGRIND_VALGRIND_H |
38 | #include <valgrind/valgrind.h> | |
39 | #endif | |
0b452006 | 40 | |
b5efdb8a | 41 | #include "alloc-util.h" |
6e5f1b57 | 42 | #include "architecture.h" |
4f5dd394 | 43 | #include "escape.h" |
3ffd4af2 | 44 | #include "fd-util.h" |
0b452006 | 45 | #include "fileio.h" |
f4f15635 | 46 | #include "fs-util.h" |
7b3e062c | 47 | #include "ioprio.h" |
0b452006 | 48 | #include "log.h" |
11c3a366 TA |
49 | #include "macro.h" |
50 | #include "missing.h" | |
93cc7779 | 51 | #include "process-util.h" |
8869a0b4 | 52 | #include "raw-clone.h" |
93cc7779 | 53 | #include "signal-util.h" |
1359fffa | 54 | #include "stat-util.h" |
7b3e062c | 55 | #include "string-table.h" |
07630cea | 56 | #include "string-util.h" |
b1d4f8e1 | 57 | #include "user-util.h" |
4f5dd394 | 58 | #include "util.h" |
0b452006 RC |
59 | |
60 | int get_process_state(pid_t pid) { | |
61 | const char *p; | |
62 | char state; | |
63 | int r; | |
64 | _cleanup_free_ char *line = NULL; | |
65 | ||
66 | assert(pid >= 0); | |
67 | ||
68 | p = procfs_file_alloca(pid, "stat"); | |
a644184a | 69 | |
0b452006 | 70 | r = read_one_line_file(p, &line); |
a644184a LP |
71 | if (r == -ENOENT) |
72 | return -ESRCH; | |
0b452006 RC |
73 | if (r < 0) |
74 | return r; | |
75 | ||
76 | p = strrchr(line, ')'); | |
77 | if (!p) | |
78 | return -EIO; | |
79 | ||
80 | p++; | |
81 | ||
82 | if (sscanf(p, " %c", &state) != 1) | |
83 | return -EIO; | |
84 | ||
85 | return (unsigned char) state; | |
86 | } | |
87 | ||
88 | int get_process_comm(pid_t pid, char **name) { | |
89 | const char *p; | |
90 | int r; | |
91 | ||
92 | assert(name); | |
93 | assert(pid >= 0); | |
94 | ||
95 | p = procfs_file_alloca(pid, "comm"); | |
96 | ||
97 | r = read_one_line_file(p, name); | |
98 | if (r == -ENOENT) | |
99 | return -ESRCH; | |
100 | ||
101 | return r; | |
102 | } | |
103 | ||
104 | int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) { | |
105 | _cleanup_fclose_ FILE *f = NULL; | |
ba4cd7e2 | 106 | bool space = false; |
c0534780 | 107 | char *k, *ans = NULL; |
0b452006 RC |
108 | const char *p; |
109 | int c; | |
110 | ||
111 | assert(line); | |
112 | assert(pid >= 0); | |
113 | ||
69281c49 LP |
114 | /* Retrieves a process' command line. Replaces unprintable characters while doing so by whitespace (coalescing |
115 | * multiple sequential ones into one). If max_length is != 0 will return a string of the specified size at most | |
116 | * (the trailing NUL byte does count towards the length here!), abbreviated with a "..." ellipsis. If | |
117 | * comm_fallback is true and the process has no command line set (the case for kernel threads), or has a | |
118 | * command line that resolves to the empty string will return the "comm" name of the process instead. | |
119 | * | |
120 | * Returns -ESRCH if the process doesn't exist, and -ENOENT if the process has no command line (and | |
c0534780 | 121 | * comm_fallback is false). Returns 0 and sets *line otherwise. */ |
69281c49 | 122 | |
0b452006 RC |
123 | p = procfs_file_alloca(pid, "cmdline"); |
124 | ||
125 | f = fopen(p, "re"); | |
a644184a LP |
126 | if (!f) { |
127 | if (errno == ENOENT) | |
128 | return -ESRCH; | |
0b452006 | 129 | return -errno; |
a644184a | 130 | } |
0b452006 | 131 | |
69281c49 LP |
132 | if (max_length == 1) { |
133 | ||
134 | /* If there's only room for one byte, return the empty string */ | |
c0534780 ZJS |
135 | ans = new0(char, 1); |
136 | if (!ans) | |
69281c49 LP |
137 | return -ENOMEM; |
138 | ||
c0534780 | 139 | *line = ans; |
69281c49 LP |
140 | return 0; |
141 | ||
142 | } else if (max_length == 0) { | |
0b452006 RC |
143 | size_t len = 0, allocated = 0; |
144 | ||
145 | while ((c = getc(f)) != EOF) { | |
146 | ||
c0534780 ZJS |
147 | if (!GREEDY_REALLOC(ans, allocated, len+3)) { |
148 | free(ans); | |
0b452006 RC |
149 | return -ENOMEM; |
150 | } | |
151 | ||
ba4cd7e2 MP |
152 | if (isprint(c)) { |
153 | if (space) { | |
c0534780 | 154 | ans[len++] = ' '; |
ba4cd7e2 MP |
155 | space = false; |
156 | } | |
157 | ||
c0534780 | 158 | ans[len++] = c; |
69281c49 | 159 | } else if (len > 0) |
ba4cd7e2 MP |
160 | space = true; |
161 | } | |
0b452006 RC |
162 | |
163 | if (len > 0) | |
c0534780 | 164 | ans[len] = '\0'; |
b09df4e2 | 165 | else |
c0534780 | 166 | ans = mfree(ans); |
0b452006 RC |
167 | |
168 | } else { | |
69281c49 | 169 | bool dotdotdot = false; |
0b452006 RC |
170 | size_t left; |
171 | ||
c0534780 ZJS |
172 | ans = new(char, max_length); |
173 | if (!ans) | |
0b452006 RC |
174 | return -ENOMEM; |
175 | ||
c0534780 | 176 | k = ans; |
0b452006 RC |
177 | left = max_length; |
178 | while ((c = getc(f)) != EOF) { | |
179 | ||
180 | if (isprint(c)) { | |
69281c49 | 181 | |
0b452006 | 182 | if (space) { |
69281c49 LP |
183 | if (left <= 2) { |
184 | dotdotdot = true; | |
0b452006 | 185 | break; |
69281c49 | 186 | } |
0b452006 RC |
187 | |
188 | *(k++) = ' '; | |
189 | left--; | |
190 | space = false; | |
191 | } | |
192 | ||
69281c49 LP |
193 | if (left <= 1) { |
194 | dotdotdot = true; | |
0b452006 | 195 | break; |
69281c49 | 196 | } |
0b452006 RC |
197 | |
198 | *(k++) = (char) c; | |
199 | left--; | |
c0534780 | 200 | } else if (k > ans) |
0b452006 RC |
201 | space = true; |
202 | } | |
203 | ||
69281c49 LP |
204 | if (dotdotdot) { |
205 | if (max_length <= 4) { | |
c0534780 | 206 | k = ans; |
69281c49 LP |
207 | left = max_length; |
208 | } else { | |
c0534780 | 209 | k = ans + max_length - 4; |
69281c49 LP |
210 | left = 4; |
211 | ||
212 | /* Eat up final spaces */ | |
c0534780 | 213 | while (k > ans && isspace(k[-1])) { |
69281c49 LP |
214 | k--; |
215 | left++; | |
216 | } | |
217 | } | |
218 | ||
219 | strncpy(k, "...", left-1); | |
b09df4e2 | 220 | k[left-1] = 0; |
0b452006 RC |
221 | } else |
222 | *k = 0; | |
223 | } | |
224 | ||
225 | /* Kernel threads have no argv[] */ | |
c0534780 | 226 | if (isempty(ans)) { |
0b452006 RC |
227 | _cleanup_free_ char *t = NULL; |
228 | int h; | |
229 | ||
c0534780 | 230 | free(ans); |
0b452006 RC |
231 | |
232 | if (!comm_fallback) | |
233 | return -ENOENT; | |
234 | ||
235 | h = get_process_comm(pid, &t); | |
236 | if (h < 0) | |
237 | return h; | |
238 | ||
69281c49 | 239 | if (max_length == 0) |
c0534780 | 240 | ans = strjoin("[", t, "]"); |
69281c49 LP |
241 | else { |
242 | size_t l; | |
243 | ||
244 | l = strlen(t); | |
245 | ||
246 | if (l + 3 <= max_length) | |
c0534780 | 247 | ans = strjoin("[", t, "]"); |
69281c49 LP |
248 | else if (max_length <= 6) { |
249 | ||
c0534780 ZJS |
250 | ans = new(char, max_length); |
251 | if (!ans) | |
69281c49 LP |
252 | return -ENOMEM; |
253 | ||
c0534780 ZJS |
254 | memcpy(ans, "[...]", max_length-1); |
255 | ans[max_length-1] = 0; | |
69281c49 LP |
256 | } else { |
257 | char *e; | |
258 | ||
259 | t[max_length - 6] = 0; | |
260 | ||
261 | /* Chop off final spaces */ | |
262 | e = strchr(t, 0); | |
263 | while (e > t && isspace(e[-1])) | |
264 | e--; | |
265 | *e = 0; | |
266 | ||
c0534780 | 267 | ans = strjoin("[", t, "...]"); |
69281c49 LP |
268 | } |
269 | } | |
c0534780 | 270 | if (!ans) |
0b452006 RC |
271 | return -ENOMEM; |
272 | } | |
273 | ||
c0534780 | 274 | *line = ans; |
0b452006 RC |
275 | return 0; |
276 | } | |
277 | ||
9bfaffd5 LP |
278 | int rename_process(const char name[]) { |
279 | static size_t mm_size = 0; | |
280 | static char *mm = NULL; | |
281 | bool truncated = false; | |
282 | size_t l; | |
283 | ||
284 | /* This is a like a poor man's setproctitle(). It changes the comm field, argv[0], and also the glibc's | |
285 | * internally used name of the process. For the first one a limit of 16 chars applies; to the second one in | |
286 | * many cases one of 10 (i.e. length of "/sbin/init") — however if we have CAP_SYS_RESOURCES it is unbounded; | |
287 | * to the third one 7 (i.e. the length of "systemd". If you pass a longer string it will likely be | |
288 | * truncated. | |
289 | * | |
290 | * Returns 0 if a name was set but truncated, > 0 if it was set but not truncated. */ | |
291 | ||
292 | if (isempty(name)) | |
293 | return -EINVAL; /* let's not confuse users unnecessarily with an empty name */ | |
405f8907 | 294 | |
9bfaffd5 | 295 | l = strlen(name); |
405f8907 | 296 | |
9bfaffd5 | 297 | /* First step, change the comm field. */ |
79d62972 | 298 | (void) prctl(PR_SET_NAME, name); |
9bfaffd5 LP |
299 | if (l > 15) /* Linux process names can be 15 chars at max */ |
300 | truncated = true; | |
301 | ||
302 | /* Second step, change glibc's ID of the process name. */ | |
303 | if (program_invocation_name) { | |
304 | size_t k; | |
305 | ||
306 | k = strlen(program_invocation_name); | |
307 | strncpy(program_invocation_name, name, k); | |
308 | if (l > k) | |
309 | truncated = true; | |
310 | } | |
311 | ||
312 | /* Third step, completely replace the argv[] array the kernel maintains for us. This requires privileges, but | |
313 | * has the advantage that the argv[] array is exactly what we want it to be, and not filled up with zeros at | |
13e785f7 | 314 | * the end. This is the best option for changing /proc/self/cmdline. */ |
9bfaffd5 LP |
315 | if (mm_size < l+1) { |
316 | size_t nn_size; | |
317 | char *nn; | |
318 | ||
319 | /* Let's not bother with this if we don't have euid == 0. Strictly speaking if people do weird stuff | |
320 | * with capabilities this could work even for euid != 0, but our own code generally doesn't do that, | |
321 | * hence let's use this as quick bypass check, to avoid calling mmap() if PR_SET_MM_ARG_START fails | |
322 | * with EPERM later on anyway. After all geteuid() is dead cheap to call, but mmap() is not. */ | |
323 | if (geteuid() != 0) { | |
324 | log_debug("Skipping PR_SET_MM_ARG_START, as we don't have privileges."); | |
325 | goto use_saved_argv; | |
326 | } | |
327 | ||
328 | nn_size = PAGE_ALIGN(l+1); | |
329 | nn = mmap(NULL, nn_size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
330 | if (nn == MAP_FAILED) { | |
331 | log_debug_errno(errno, "mmap() failed: %m"); | |
332 | goto use_saved_argv; | |
333 | } | |
405f8907 | 334 | |
9bfaffd5 LP |
335 | strncpy(nn, name, nn_size); |
336 | ||
337 | /* Now, let's tell the kernel about this new memory */ | |
338 | if (prctl(PR_SET_MM, PR_SET_MM_ARG_START, (unsigned long) nn, 0, 0) < 0) { | |
339 | log_debug_errno(errno, "PR_SET_MM_ARG_START failed, proceeding without: %m"); | |
340 | (void) munmap(nn, nn_size); | |
341 | goto use_saved_argv; | |
342 | } | |
343 | ||
344 | /* And update the end pointer to the new end, too. If this fails, we don't really know what to do, it's | |
345 | * pretty unlikely that we can rollback, hence we'll just accept the failure, and continue. */ | |
346 | if (prctl(PR_SET_MM, PR_SET_MM_ARG_END, (unsigned long) nn + l + 1, 0, 0) < 0) | |
347 | log_debug_errno(errno, "PR_SET_MM_ARG_END failed, proceeding without: %m"); | |
348 | ||
349 | if (mm) | |
350 | (void) munmap(mm, mm_size); | |
351 | ||
352 | mm = nn; | |
353 | mm_size = nn_size; | |
354 | } else | |
355 | strncpy(mm, name, mm_size); | |
356 | ||
357 | use_saved_argv: | |
358 | /* Fourth step: in all cases we'll also update the original argv[], so that our own code gets it right too if | |
359 | * it still looks here */ | |
405f8907 LP |
360 | |
361 | if (saved_argc > 0) { | |
362 | int i; | |
363 | ||
9bfaffd5 LP |
364 | if (saved_argv[0]) { |
365 | size_t k; | |
366 | ||
367 | k = strlen(saved_argv[0]); | |
368 | strncpy(saved_argv[0], name, k); | |
369 | if (l > k) | |
370 | truncated = true; | |
371 | } | |
405f8907 LP |
372 | |
373 | for (i = 1; i < saved_argc; i++) { | |
374 | if (!saved_argv[i]) | |
375 | break; | |
376 | ||
377 | memzero(saved_argv[i], strlen(saved_argv[i])); | |
378 | } | |
379 | } | |
9bfaffd5 LP |
380 | |
381 | return !truncated; | |
405f8907 LP |
382 | } |
383 | ||
0b452006 RC |
384 | int is_kernel_thread(pid_t pid) { |
385 | const char *p; | |
386 | size_t count; | |
387 | char c; | |
388 | bool eof; | |
389 | FILE *f; | |
390 | ||
a6149b93 | 391 | if (pid == 0 || pid == 1) /* pid 1, and we ourselves certainly aren't a kernel thread */ |
0b452006 RC |
392 | return 0; |
393 | ||
a6149b93 | 394 | assert(pid > 1); |
0b452006 RC |
395 | |
396 | p = procfs_file_alloca(pid, "cmdline"); | |
397 | f = fopen(p, "re"); | |
a644184a LP |
398 | if (!f) { |
399 | if (errno == ENOENT) | |
400 | return -ESRCH; | |
0b452006 | 401 | return -errno; |
a644184a | 402 | } |
0b452006 RC |
403 | |
404 | count = fread(&c, 1, 1, f); | |
405 | eof = feof(f); | |
406 | fclose(f); | |
407 | ||
408 | /* Kernel threads have an empty cmdline */ | |
409 | ||
410 | if (count <= 0) | |
411 | return eof ? 1 : -errno; | |
412 | ||
413 | return 0; | |
414 | } | |
415 | ||
416 | int get_process_capeff(pid_t pid, char **capeff) { | |
417 | const char *p; | |
a644184a | 418 | int r; |
0b452006 RC |
419 | |
420 | assert(capeff); | |
421 | assert(pid >= 0); | |
422 | ||
423 | p = procfs_file_alloca(pid, "status"); | |
424 | ||
c4cd1d4d | 425 | r = get_proc_field(p, "CapEff", WHITESPACE, capeff); |
a644184a LP |
426 | if (r == -ENOENT) |
427 | return -ESRCH; | |
428 | ||
429 | return r; | |
0b452006 RC |
430 | } |
431 | ||
432 | static int get_process_link_contents(const char *proc_file, char **name) { | |
433 | int r; | |
434 | ||
435 | assert(proc_file); | |
436 | assert(name); | |
437 | ||
438 | r = readlink_malloc(proc_file, name); | |
a644184a LP |
439 | if (r == -ENOENT) |
440 | return -ESRCH; | |
0b452006 | 441 | if (r < 0) |
a644184a | 442 | return r; |
0b452006 RC |
443 | |
444 | return 0; | |
445 | } | |
446 | ||
447 | int get_process_exe(pid_t pid, char **name) { | |
448 | const char *p; | |
449 | char *d; | |
450 | int r; | |
451 | ||
452 | assert(pid >= 0); | |
453 | ||
454 | p = procfs_file_alloca(pid, "exe"); | |
455 | r = get_process_link_contents(p, name); | |
456 | if (r < 0) | |
457 | return r; | |
458 | ||
459 | d = endswith(*name, " (deleted)"); | |
460 | if (d) | |
461 | *d = '\0'; | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | static int get_process_id(pid_t pid, const char *field, uid_t *uid) { | |
467 | _cleanup_fclose_ FILE *f = NULL; | |
468 | char line[LINE_MAX]; | |
469 | const char *p; | |
470 | ||
471 | assert(field); | |
472 | assert(uid); | |
473 | ||
0b452006 RC |
474 | p = procfs_file_alloca(pid, "status"); |
475 | f = fopen(p, "re"); | |
a644184a LP |
476 | if (!f) { |
477 | if (errno == ENOENT) | |
478 | return -ESRCH; | |
0b452006 | 479 | return -errno; |
a644184a | 480 | } |
0b452006 RC |
481 | |
482 | FOREACH_LINE(line, f, return -errno) { | |
483 | char *l; | |
484 | ||
485 | l = strstrip(line); | |
486 | ||
487 | if (startswith(l, field)) { | |
488 | l += strlen(field); | |
489 | l += strspn(l, WHITESPACE); | |
490 | ||
491 | l[strcspn(l, WHITESPACE)] = 0; | |
492 | ||
493 | return parse_uid(l, uid); | |
494 | } | |
495 | } | |
496 | ||
497 | return -EIO; | |
498 | } | |
499 | ||
500 | int get_process_uid(pid_t pid, uid_t *uid) { | |
501 | return get_process_id(pid, "Uid:", uid); | |
502 | } | |
503 | ||
504 | int get_process_gid(pid_t pid, gid_t *gid) { | |
505 | assert_cc(sizeof(uid_t) == sizeof(gid_t)); | |
506 | return get_process_id(pid, "Gid:", gid); | |
507 | } | |
508 | ||
509 | int get_process_cwd(pid_t pid, char **cwd) { | |
510 | const char *p; | |
511 | ||
512 | assert(pid >= 0); | |
513 | ||
514 | p = procfs_file_alloca(pid, "cwd"); | |
515 | ||
516 | return get_process_link_contents(p, cwd); | |
517 | } | |
518 | ||
519 | int get_process_root(pid_t pid, char **root) { | |
520 | const char *p; | |
521 | ||
522 | assert(pid >= 0); | |
523 | ||
524 | p = procfs_file_alloca(pid, "root"); | |
525 | ||
526 | return get_process_link_contents(p, root); | |
527 | } | |
528 | ||
529 | int get_process_environ(pid_t pid, char **env) { | |
530 | _cleanup_fclose_ FILE *f = NULL; | |
531 | _cleanup_free_ char *outcome = NULL; | |
532 | int c; | |
533 | const char *p; | |
534 | size_t allocated = 0, sz = 0; | |
535 | ||
536 | assert(pid >= 0); | |
537 | assert(env); | |
538 | ||
539 | p = procfs_file_alloca(pid, "environ"); | |
540 | ||
541 | f = fopen(p, "re"); | |
a644184a LP |
542 | if (!f) { |
543 | if (errno == ENOENT) | |
544 | return -ESRCH; | |
0b452006 | 545 | return -errno; |
a644184a | 546 | } |
0b452006 RC |
547 | |
548 | while ((c = fgetc(f)) != EOF) { | |
549 | if (!GREEDY_REALLOC(outcome, allocated, sz + 5)) | |
550 | return -ENOMEM; | |
551 | ||
552 | if (c == '\0') | |
553 | outcome[sz++] = '\n'; | |
554 | else | |
555 | sz += cescape_char(c, outcome + sz); | |
556 | } | |
557 | ||
03c55bc0 LP |
558 | if (!outcome) { |
559 | outcome = strdup(""); | |
560 | if (!outcome) | |
561 | return -ENOMEM; | |
562 | } else | |
563 | outcome[sz] = '\0'; | |
de8763b6 | 564 | |
0b452006 RC |
565 | *env = outcome; |
566 | outcome = NULL; | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
6bc73acb | 571 | int get_process_ppid(pid_t pid, pid_t *_ppid) { |
0b452006 RC |
572 | int r; |
573 | _cleanup_free_ char *line = NULL; | |
574 | long unsigned ppid; | |
575 | const char *p; | |
576 | ||
577 | assert(pid >= 0); | |
578 | assert(_ppid); | |
579 | ||
580 | if (pid == 0) { | |
581 | *_ppid = getppid(); | |
582 | return 0; | |
583 | } | |
584 | ||
585 | p = procfs_file_alloca(pid, "stat"); | |
586 | r = read_one_line_file(p, &line); | |
a644184a LP |
587 | if (r == -ENOENT) |
588 | return -ESRCH; | |
0b452006 RC |
589 | if (r < 0) |
590 | return r; | |
591 | ||
592 | /* Let's skip the pid and comm fields. The latter is enclosed | |
593 | * in () but does not escape any () in its value, so let's | |
594 | * skip over it manually */ | |
595 | ||
596 | p = strrchr(line, ')'); | |
597 | if (!p) | |
598 | return -EIO; | |
599 | ||
600 | p++; | |
601 | ||
602 | if (sscanf(p, " " | |
603 | "%*c " /* state */ | |
604 | "%lu ", /* ppid */ | |
605 | &ppid) != 1) | |
606 | return -EIO; | |
607 | ||
608 | if ((long unsigned) (pid_t) ppid != ppid) | |
609 | return -ERANGE; | |
610 | ||
611 | *_ppid = (pid_t) ppid; | |
612 | ||
613 | return 0; | |
614 | } | |
615 | ||
616 | int wait_for_terminate(pid_t pid, siginfo_t *status) { | |
617 | siginfo_t dummy; | |
618 | ||
619 | assert(pid >= 1); | |
620 | ||
621 | if (!status) | |
622 | status = &dummy; | |
623 | ||
624 | for (;;) { | |
625 | zero(*status); | |
626 | ||
627 | if (waitid(P_PID, pid, status, WEXITED) < 0) { | |
628 | ||
629 | if (errno == EINTR) | |
630 | continue; | |
631 | ||
3f0083a2 | 632 | return negative_errno(); |
0b452006 RC |
633 | } |
634 | ||
635 | return 0; | |
636 | } | |
637 | } | |
638 | ||
639 | /* | |
640 | * Return values: | |
641 | * < 0 : wait_for_terminate() failed to get the state of the | |
642 | * process, the process was terminated by a signal, or | |
643 | * failed for an unknown reason. | |
644 | * >=0 : The process terminated normally, and its exit code is | |
645 | * returned. | |
646 | * | |
647 | * That is, success is indicated by a return value of zero, and an | |
648 | * error is indicated by a non-zero value. | |
649 | * | |
650 | * A warning is emitted if the process terminates abnormally, | |
651 | * and also if it returns non-zero unless check_exit_code is true. | |
652 | */ | |
653 | int wait_for_terminate_and_warn(const char *name, pid_t pid, bool check_exit_code) { | |
654 | int r; | |
655 | siginfo_t status; | |
656 | ||
657 | assert(name); | |
658 | assert(pid > 1); | |
659 | ||
660 | r = wait_for_terminate(pid, &status); | |
661 | if (r < 0) | |
662 | return log_warning_errno(r, "Failed to wait for %s: %m", name); | |
663 | ||
664 | if (status.si_code == CLD_EXITED) { | |
665 | if (status.si_status != 0) | |
666 | log_full(check_exit_code ? LOG_WARNING : LOG_DEBUG, | |
667 | "%s failed with error code %i.", name, status.si_status); | |
668 | else | |
669 | log_debug("%s succeeded.", name); | |
670 | ||
671 | return status.si_status; | |
672 | } else if (status.si_code == CLD_KILLED || | |
673 | status.si_code == CLD_DUMPED) { | |
674 | ||
675 | log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status)); | |
676 | return -EPROTO; | |
677 | } | |
678 | ||
679 | log_warning("%s failed due to unknown reason.", name); | |
680 | return -EPROTO; | |
681 | } | |
682 | ||
89c9030d LP |
683 | void sigkill_wait(pid_t pid) { |
684 | assert(pid > 1); | |
685 | ||
686 | if (kill(pid, SIGKILL) > 0) | |
687 | (void) wait_for_terminate(pid, NULL); | |
688 | } | |
689 | ||
690 | void sigkill_waitp(pid_t *pid) { | |
4d0d3d41 LP |
691 | if (!pid) |
692 | return; | |
693 | if (*pid <= 1) | |
694 | return; | |
695 | ||
89c9030d | 696 | sigkill_wait(*pid); |
4d0d3d41 LP |
697 | } |
698 | ||
0b452006 RC |
699 | int kill_and_sigcont(pid_t pid, int sig) { |
700 | int r; | |
701 | ||
702 | r = kill(pid, sig) < 0 ? -errno : 0; | |
703 | ||
26f417d3 LP |
704 | /* If this worked, also send SIGCONT, unless we already just sent a SIGCONT, or SIGKILL was sent which isn't |
705 | * affected by a process being suspended anyway. */ | |
a3d8d68c | 706 | if (r >= 0 && !IN_SET(sig, SIGCONT, SIGKILL)) |
26f417d3 | 707 | (void) kill(pid, SIGCONT); |
0b452006 RC |
708 | |
709 | return r; | |
710 | } | |
711 | ||
712 | int getenv_for_pid(pid_t pid, const char *field, char **_value) { | |
713 | _cleanup_fclose_ FILE *f = NULL; | |
714 | char *value = NULL; | |
715 | int r; | |
716 | bool done = false; | |
717 | size_t l; | |
718 | const char *path; | |
719 | ||
720 | assert(pid >= 0); | |
721 | assert(field); | |
722 | assert(_value); | |
723 | ||
724 | path = procfs_file_alloca(pid, "environ"); | |
725 | ||
726 | f = fopen(path, "re"); | |
a644184a LP |
727 | if (!f) { |
728 | if (errno == ENOENT) | |
729 | return -ESRCH; | |
0b452006 | 730 | return -errno; |
a644184a | 731 | } |
0b452006 RC |
732 | |
733 | l = strlen(field); | |
734 | r = 0; | |
735 | ||
736 | do { | |
737 | char line[LINE_MAX]; | |
738 | unsigned i; | |
739 | ||
740 | for (i = 0; i < sizeof(line)-1; i++) { | |
741 | int c; | |
742 | ||
743 | c = getc(f); | |
744 | if (_unlikely_(c == EOF)) { | |
745 | done = true; | |
746 | break; | |
747 | } else if (c == 0) | |
748 | break; | |
749 | ||
750 | line[i] = c; | |
751 | } | |
752 | line[i] = 0; | |
753 | ||
041b5ae1 | 754 | if (strneq(line, field, l) && line[l] == '=') { |
0b452006 RC |
755 | value = strdup(line + l + 1); |
756 | if (!value) | |
757 | return -ENOMEM; | |
758 | ||
759 | r = 1; | |
760 | break; | |
761 | } | |
762 | ||
763 | } while (!done); | |
764 | ||
765 | *_value = value; | |
766 | return r; | |
767 | } | |
768 | ||
769 | bool pid_is_unwaited(pid_t pid) { | |
770 | /* Checks whether a PID is still valid at all, including a zombie */ | |
771 | ||
5fd9b2c5 | 772 | if (pid < 0) |
0b452006 RC |
773 | return false; |
774 | ||
5fd9b2c5 LP |
775 | if (pid <= 1) /* If we or PID 1 would be dead and have been waited for, this code would not be running */ |
776 | return true; | |
777 | ||
0b452006 RC |
778 | if (kill(pid, 0) >= 0) |
779 | return true; | |
780 | ||
781 | return errno != ESRCH; | |
782 | } | |
783 | ||
784 | bool pid_is_alive(pid_t pid) { | |
785 | int r; | |
786 | ||
787 | /* Checks whether a PID is still valid and not a zombie */ | |
788 | ||
5fd9b2c5 | 789 | if (pid < 0) |
0b452006 RC |
790 | return false; |
791 | ||
5fd9b2c5 LP |
792 | if (pid <= 1) /* If we or PID 1 would be a zombie, this code would not be running */ |
793 | return true; | |
794 | ||
0b452006 | 795 | r = get_process_state(pid); |
a644184a | 796 | if (r == -ESRCH || r == 'Z') |
0b452006 RC |
797 | return false; |
798 | ||
799 | return true; | |
800 | } | |
d4510856 | 801 | |
1359fffa MS |
802 | int pid_from_same_root_fs(pid_t pid) { |
803 | const char *root; | |
804 | ||
805 | if (pid < 0) | |
806 | return 0; | |
807 | ||
808 | root = procfs_file_alloca(pid, "root"); | |
809 | ||
e3f791a2 | 810 | return files_same(root, "/proc/1/root", 0); |
1359fffa MS |
811 | } |
812 | ||
d4510856 LP |
813 | bool is_main_thread(void) { |
814 | static thread_local int cached = 0; | |
815 | ||
816 | if (_unlikely_(cached == 0)) | |
817 | cached = getpid() == gettid() ? 1 : -1; | |
818 | ||
819 | return cached > 0; | |
820 | } | |
7b3e062c LP |
821 | |
822 | noreturn void freeze(void) { | |
823 | ||
3da48d7a EV |
824 | log_close(); |
825 | ||
7b3e062c LP |
826 | /* Make sure nobody waits for us on a socket anymore */ |
827 | close_all_fds(NULL, 0); | |
828 | ||
829 | sync(); | |
830 | ||
831 | for (;;) | |
832 | pause(); | |
833 | } | |
834 | ||
835 | bool oom_score_adjust_is_valid(int oa) { | |
836 | return oa >= OOM_SCORE_ADJ_MIN && oa <= OOM_SCORE_ADJ_MAX; | |
837 | } | |
838 | ||
839 | unsigned long personality_from_string(const char *p) { | |
6e5f1b57 | 840 | int architecture; |
7b3e062c | 841 | |
0c0fea07 LP |
842 | if (!p) |
843 | return PERSONALITY_INVALID; | |
844 | ||
6e5f1b57 LP |
845 | /* Parse a personality specifier. We use our own identifiers that indicate specific ABIs, rather than just |
846 | * hints regarding the register size, since we want to keep things open for multiple locally supported ABIs for | |
847 | * the same register size. */ | |
848 | ||
849 | architecture = architecture_from_string(p); | |
850 | if (architecture < 0) | |
851 | return PERSONALITY_INVALID; | |
7b3e062c | 852 | |
0c0fea07 | 853 | if (architecture == native_architecture()) |
7b3e062c | 854 | return PER_LINUX; |
0c0fea07 LP |
855 | #ifdef SECONDARY_ARCHITECTURE |
856 | if (architecture == SECONDARY_ARCHITECTURE) | |
f2d1736c | 857 | return PER_LINUX32; |
7b3e062c LP |
858 | #endif |
859 | ||
860 | return PERSONALITY_INVALID; | |
861 | } | |
862 | ||
863 | const char* personality_to_string(unsigned long p) { | |
6e5f1b57 | 864 | int architecture = _ARCHITECTURE_INVALID; |
7b3e062c | 865 | |
7b3e062c | 866 | if (p == PER_LINUX) |
0c0fea07 LP |
867 | architecture = native_architecture(); |
868 | #ifdef SECONDARY_ARCHITECTURE | |
6e5f1b57 | 869 | else if (p == PER_LINUX32) |
0c0fea07 | 870 | architecture = SECONDARY_ARCHITECTURE; |
7b3e062c LP |
871 | #endif |
872 | ||
6e5f1b57 LP |
873 | if (architecture < 0) |
874 | return NULL; | |
875 | ||
876 | return architecture_to_string(architecture); | |
7b3e062c LP |
877 | } |
878 | ||
dcadc967 EV |
879 | void valgrind_summary_hack(void) { |
880 | #ifdef HAVE_VALGRIND_VALGRIND_H | |
881 | if (getpid() == 1 && RUNNING_ON_VALGRIND) { | |
882 | pid_t pid; | |
8869a0b4 | 883 | pid = raw_clone(SIGCHLD); |
dcadc967 EV |
884 | if (pid < 0) |
885 | log_emergency_errno(errno, "Failed to fork off valgrind helper: %m"); | |
886 | else if (pid == 0) | |
887 | exit(EXIT_SUCCESS); | |
888 | else { | |
889 | log_info("Spawned valgrind helper as PID "PID_FMT".", pid); | |
890 | (void) wait_for_terminate(pid, NULL); | |
891 | } | |
892 | } | |
893 | #endif | |
894 | } | |
895 | ||
291d565a LP |
896 | int pid_compare_func(const void *a, const void *b) { |
897 | const pid_t *p = a, *q = b; | |
898 | ||
899 | /* Suitable for usage in qsort() */ | |
900 | ||
901 | if (*p < *q) | |
902 | return -1; | |
903 | if (*p > *q) | |
904 | return 1; | |
905 | return 0; | |
906 | } | |
907 | ||
7f452159 LP |
908 | int ioprio_parse_priority(const char *s, int *ret) { |
909 | int i, r; | |
910 | ||
911 | assert(s); | |
912 | assert(ret); | |
913 | ||
914 | r = safe_atoi(s, &i); | |
915 | if (r < 0) | |
916 | return r; | |
917 | ||
918 | if (!ioprio_priority_is_valid(i)) | |
919 | return -EINVAL; | |
920 | ||
921 | *ret = i; | |
922 | return 0; | |
923 | } | |
924 | ||
7b3e062c LP |
925 | static const char *const ioprio_class_table[] = { |
926 | [IOPRIO_CLASS_NONE] = "none", | |
927 | [IOPRIO_CLASS_RT] = "realtime", | |
928 | [IOPRIO_CLASS_BE] = "best-effort", | |
929 | [IOPRIO_CLASS_IDLE] = "idle" | |
930 | }; | |
931 | ||
932 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ioprio_class, int, INT_MAX); | |
933 | ||
934 | static const char *const sigchld_code_table[] = { | |
935 | [CLD_EXITED] = "exited", | |
936 | [CLD_KILLED] = "killed", | |
937 | [CLD_DUMPED] = "dumped", | |
938 | [CLD_TRAPPED] = "trapped", | |
939 | [CLD_STOPPED] = "stopped", | |
940 | [CLD_CONTINUED] = "continued", | |
941 | }; | |
942 | ||
943 | DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int); | |
944 | ||
945 | static const char* const sched_policy_table[] = { | |
946 | [SCHED_OTHER] = "other", | |
947 | [SCHED_BATCH] = "batch", | |
948 | [SCHED_IDLE] = "idle", | |
949 | [SCHED_FIFO] = "fifo", | |
950 | [SCHED_RR] = "rr" | |
951 | }; | |
952 | ||
953 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sched_policy, int, INT_MAX); |