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Commit | Line | Data |
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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
abbbea81 LP |
2 | |
3 | /*** | |
0ebee881 KS |
4 | This file is part of systemd. |
5 | ||
abbbea81 LP |
6 | Copyright 2010 Lennart Poettering |
7 | ||
0ebee881 KS |
8 | systemd is free software; you can redistribute it and/or modify it |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
abbbea81 | 17 | |
0ebee881 KS |
18 | You should have received a copy of the GNU Lesser General Public License |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
8c47c732 | 21 | |
abbbea81 | 22 | #include <errno.h> |
916abb21 | 23 | #include <limits.h> |
0ebee881 | 24 | #include <mqueue.h> |
8dd4c05b LP |
25 | #include <netinet/in.h> |
26 | #include <stdarg.h> | |
27 | #include <stddef.h> | |
28 | #include <stdio.h> | |
29 | #include <stdlib.h> | |
30 | #include <string.h> | |
31 | #include <sys/socket.h> | |
32 | #include <sys/stat.h> | |
33 | #include <sys/un.h> | |
34 | #include <unistd.h> | |
abbbea81 | 35 | |
be8f4e9e | 36 | #include "path-util.h" |
3cb46740 | 37 | #include "socket-util.h" |
8dd4c05b LP |
38 | #include "strv.h" |
39 | #include "util.h" | |
40 | ||
abbbea81 LP |
41 | #include "sd-daemon.h" |
42 | ||
8dd4c05b LP |
43 | static void unsetenv_all(bool unset_environment) { |
44 | ||
45 | if (!unset_environment) | |
46 | return; | |
47 | ||
48 | unsetenv("LISTEN_PID"); | |
49 | unsetenv("LISTEN_FDS"); | |
50 | unsetenv("LISTEN_FDNAMES"); | |
51 | } | |
52 | ||
0ebee881 | 53 | _public_ int sd_listen_fds(int unset_environment) { |
abbbea81 | 54 | const char *e; |
be8f4e9e LP |
55 | unsigned n; |
56 | int r, fd; | |
57 | pid_t pid; | |
abbbea81 | 58 | |
50425d16 MS |
59 | e = getenv("LISTEN_PID"); |
60 | if (!e) { | |
abbbea81 LP |
61 | r = 0; |
62 | goto finish; | |
63 | } | |
64 | ||
be8f4e9e LP |
65 | r = parse_pid(e, &pid); |
66 | if (r < 0) | |
abbbea81 | 67 | goto finish; |
abbbea81 LP |
68 | |
69 | /* Is this for us? */ | |
be8f4e9e | 70 | if (getpid() != pid) { |
abbbea81 LP |
71 | r = 0; |
72 | goto finish; | |
73 | } | |
74 | ||
50425d16 MS |
75 | e = getenv("LISTEN_FDS"); |
76 | if (!e) { | |
abbbea81 LP |
77 | r = 0; |
78 | goto finish; | |
79 | } | |
80 | ||
be8f4e9e LP |
81 | r = safe_atou(e, &n); |
82 | if (r < 0) | |
abbbea81 | 83 | goto finish; |
8640e111 | 84 | |
be8f4e9e LP |
85 | for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + (int) n; fd ++) { |
86 | r = fd_cloexec(fd, true); | |
87 | if (r < 0) | |
8640e111 | 88 | goto finish; |
8640e111 LP |
89 | } |
90 | ||
be8f4e9e | 91 | r = (int) n; |
abbbea81 LP |
92 | |
93 | finish: | |
8dd4c05b LP |
94 | unsetenv_all(unset_environment); |
95 | return r; | |
96 | } | |
97 | ||
98 | _public_ int sd_listen_fds_with_names(int unset_environment, char ***names) { | |
99 | _cleanup_strv_free_ char **l = NULL; | |
100 | bool have_names; | |
101 | int n_names = 0, n_fds; | |
102 | const char *e; | |
103 | int r; | |
104 | ||
105 | if (!names) | |
106 | return sd_listen_fds(unset_environment); | |
107 | ||
108 | e = getenv("LISTEN_FDNAMES"); | |
109 | if (e) { | |
110 | n_names = strv_split_extract(&l, e, ":", EXTRACT_DONT_COALESCE_SEPARATORS); | |
111 | if (n_names < 0) { | |
112 | unsetenv_all(unset_environment); | |
113 | return n_names; | |
114 | } | |
115 | ||
116 | have_names = true; | |
117 | } else | |
118 | have_names = false; | |
119 | ||
120 | n_fds = sd_listen_fds(unset_environment); | |
121 | if (n_fds <= 0) | |
122 | return n_fds; | |
123 | ||
124 | if (have_names) { | |
125 | if (n_names != n_fds) | |
126 | return -EINVAL; | |
127 | } else { | |
128 | r = strv_extend_n(&l, "unknown", n_fds); | |
129 | if (r < 0) | |
130 | return r; | |
abbbea81 LP |
131 | } |
132 | ||
8dd4c05b LP |
133 | *names = l; |
134 | l = NULL; | |
135 | ||
136 | return n_fds; | |
abbbea81 | 137 | } |
7c394faa | 138 | |
0ebee881 | 139 | _public_ int sd_is_fifo(int fd, const char *path) { |
7c394faa LP |
140 | struct stat st_fd; |
141 | ||
e6803801 | 142 | assert_return(fd >= 0, -EBADF); |
7c394faa | 143 | |
7c394faa LP |
144 | if (fstat(fd, &st_fd) < 0) |
145 | return -errno; | |
146 | ||
147 | if (!S_ISFIFO(st_fd.st_mode)) | |
148 | return 0; | |
149 | ||
150 | if (path) { | |
151 | struct stat st_path; | |
152 | ||
fd8bccfb | 153 | if (stat(path, &st_path) < 0) { |
7c394faa LP |
154 | |
155 | if (errno == ENOENT || errno == ENOTDIR) | |
156 | return 0; | |
157 | ||
158 | return -errno; | |
159 | } | |
160 | ||
161 | return | |
162 | st_path.st_dev == st_fd.st_dev && | |
163 | st_path.st_ino == st_fd.st_ino; | |
164 | } | |
165 | ||
166 | return 1; | |
167 | } | |
168 | ||
0ebee881 | 169 | _public_ int sd_is_special(int fd, const char *path) { |
4160ec67 WD |
170 | struct stat st_fd; |
171 | ||
e6803801 | 172 | assert_return(fd >= 0, -EBADF); |
4160ec67 WD |
173 | |
174 | if (fstat(fd, &st_fd) < 0) | |
175 | return -errno; | |
176 | ||
177 | if (!S_ISREG(st_fd.st_mode) && !S_ISCHR(st_fd.st_mode)) | |
178 | return 0; | |
179 | ||
180 | if (path) { | |
181 | struct stat st_path; | |
182 | ||
183 | if (stat(path, &st_path) < 0) { | |
184 | ||
185 | if (errno == ENOENT || errno == ENOTDIR) | |
186 | return 0; | |
187 | ||
188 | return -errno; | |
189 | } | |
190 | ||
191 | if (S_ISREG(st_fd.st_mode) && S_ISREG(st_path.st_mode)) | |
192 | return | |
193 | st_path.st_dev == st_fd.st_dev && | |
194 | st_path.st_ino == st_fd.st_ino; | |
195 | else if (S_ISCHR(st_fd.st_mode) && S_ISCHR(st_path.st_mode)) | |
196 | return st_path.st_rdev == st_fd.st_rdev; | |
197 | else | |
198 | return 0; | |
199 | } | |
200 | ||
201 | return 1; | |
202 | } | |
203 | ||
e6a3081a | 204 | static int sd_is_socket_internal(int fd, int type, int listening) { |
7c394faa LP |
205 | struct stat st_fd; |
206 | ||
e6803801 | 207 | assert_return(fd >= 0, -EBADF); |
be8f4e9e | 208 | assert_return(type >= 0, -EINVAL); |
7c394faa LP |
209 | |
210 | if (fstat(fd, &st_fd) < 0) | |
211 | return -errno; | |
212 | ||
213 | if (!S_ISSOCK(st_fd.st_mode)) | |
214 | return 0; | |
215 | ||
216 | if (type != 0) { | |
217 | int other_type = 0; | |
218 | socklen_t l = sizeof(other_type); | |
219 | ||
220 | if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &other_type, &l) < 0) | |
221 | return -errno; | |
222 | ||
223 | if (l != sizeof(other_type)) | |
224 | return -EINVAL; | |
225 | ||
226 | if (other_type != type) | |
227 | return 0; | |
228 | } | |
229 | ||
230 | if (listening >= 0) { | |
231 | int accepting = 0; | |
232 | socklen_t l = sizeof(accepting); | |
233 | ||
234 | if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &accepting, &l) < 0) | |
235 | return -errno; | |
236 | ||
237 | if (l != sizeof(accepting)) | |
238 | return -EINVAL; | |
239 | ||
dde770cf | 240 | if (!accepting != !listening) |
7c394faa LP |
241 | return 0; |
242 | } | |
243 | ||
244 | return 1; | |
245 | } | |
246 | ||
0ebee881 | 247 | _public_ int sd_is_socket(int fd, int family, int type, int listening) { |
88ce42f6 LP |
248 | int r; |
249 | ||
e6803801 | 250 | assert_return(fd >= 0, -EBADF); |
be8f4e9e | 251 | assert_return(family >= 0, -EINVAL); |
88ce42f6 | 252 | |
50425d16 MS |
253 | r = sd_is_socket_internal(fd, type, listening); |
254 | if (r <= 0) | |
88ce42f6 LP |
255 | return r; |
256 | ||
257 | if (family > 0) { | |
1c633045 ZJS |
258 | union sockaddr_union sockaddr = {}; |
259 | socklen_t l = sizeof(sockaddr); | |
88ce42f6 LP |
260 | |
261 | if (getsockname(fd, &sockaddr.sa, &l) < 0) | |
262 | return -errno; | |
263 | ||
b7f42664 | 264 | if (l < sizeof(sa_family_t)) |
88ce42f6 LP |
265 | return -EINVAL; |
266 | ||
267 | return sockaddr.sa.sa_family == family; | |
268 | } | |
269 | ||
270 | return 1; | |
271 | } | |
272 | ||
0ebee881 | 273 | _public_ int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port) { |
1c633045 ZJS |
274 | union sockaddr_union sockaddr = {}; |
275 | socklen_t l = sizeof(sockaddr); | |
7c394faa LP |
276 | int r; |
277 | ||
e6803801 | 278 | assert_return(fd >= 0, -EBADF); |
be8f4e9e | 279 | assert_return(IN_SET(family, 0, AF_INET, AF_INET6), -EINVAL); |
88ce42f6 | 280 | |
50425d16 MS |
281 | r = sd_is_socket_internal(fd, type, listening); |
282 | if (r <= 0) | |
7c394faa LP |
283 | return r; |
284 | ||
7c394faa LP |
285 | if (getsockname(fd, &sockaddr.sa, &l) < 0) |
286 | return -errno; | |
287 | ||
b7f42664 | 288 | if (l < sizeof(sa_family_t)) |
7c394faa LP |
289 | return -EINVAL; |
290 | ||
291 | if (sockaddr.sa.sa_family != AF_INET && | |
292 | sockaddr.sa.sa_family != AF_INET6) | |
293 | return 0; | |
294 | ||
be8f4e9e | 295 | if (family != 0) |
88ce42f6 LP |
296 | if (sockaddr.sa.sa_family != family) |
297 | return 0; | |
298 | ||
7c394faa LP |
299 | if (port > 0) { |
300 | if (sockaddr.sa.sa_family == AF_INET) { | |
301 | if (l < sizeof(struct sockaddr_in)) | |
302 | return -EINVAL; | |
303 | ||
3cb46740 | 304 | return htons(port) == sockaddr.in.sin_port; |
7c394faa LP |
305 | } else { |
306 | if (l < sizeof(struct sockaddr_in6)) | |
307 | return -EINVAL; | |
308 | ||
309 | return htons(port) == sockaddr.in6.sin6_port; | |
310 | } | |
311 | } | |
312 | ||
313 | return 1; | |
314 | } | |
315 | ||
0ebee881 | 316 | _public_ int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) { |
1c633045 ZJS |
317 | union sockaddr_union sockaddr = {}; |
318 | socklen_t l = sizeof(sockaddr); | |
7c394faa LP |
319 | int r; |
320 | ||
e6803801 | 321 | assert_return(fd >= 0, -EBADF); |
be8f4e9e | 322 | |
50425d16 MS |
323 | r = sd_is_socket_internal(fd, type, listening); |
324 | if (r <= 0) | |
7c394faa LP |
325 | return r; |
326 | ||
7c394faa LP |
327 | if (getsockname(fd, &sockaddr.sa, &l) < 0) |
328 | return -errno; | |
329 | ||
b7f42664 | 330 | if (l < sizeof(sa_family_t)) |
7c394faa LP |
331 | return -EINVAL; |
332 | ||
333 | if (sockaddr.sa.sa_family != AF_UNIX) | |
334 | return 0; | |
335 | ||
336 | if (path) { | |
d1d7caee | 337 | if (length == 0) |
7c394faa LP |
338 | length = strlen(path); |
339 | ||
d1d7caee | 340 | if (length == 0) |
7c394faa | 341 | /* Unnamed socket */ |
0e098b15 | 342 | return l == offsetof(struct sockaddr_un, sun_path); |
7c394faa | 343 | |
7c394faa LP |
344 | if (path[0]) |
345 | /* Normal path socket */ | |
cd250a39 | 346 | return |
0e098b15 | 347 | (l >= offsetof(struct sockaddr_un, sun_path) + length + 1) && |
cd250a39 | 348 | memcmp(path, sockaddr.un.sun_path, length+1) == 0; |
7c394faa LP |
349 | else |
350 | /* Abstract namespace socket */ | |
cd250a39 | 351 | return |
0e098b15 | 352 | (l == offsetof(struct sockaddr_un, sun_path) + length) && |
cd250a39 | 353 | memcmp(path, sockaddr.un.sun_path, length) == 0; |
7c394faa LP |
354 | } |
355 | ||
356 | return 1; | |
357 | } | |
8c47c732 | 358 | |
0ebee881 | 359 | _public_ int sd_is_mq(int fd, const char *path) { |
916abb21 LP |
360 | struct mq_attr attr; |
361 | ||
0260d1d5 ZJS |
362 | /* Check that the fd is valid */ |
363 | assert_return(fcntl(fd, F_GETFD) >= 0, -errno); | |
916abb21 | 364 | |
0260d1d5 ZJS |
365 | if (mq_getattr(fd, &attr) < 0) { |
366 | if (errno == EBADF) | |
367 | /* A non-mq fd (or an invalid one, but we ruled that out above) */ | |
368 | return 0; | |
916abb21 | 369 | return -errno; |
0260d1d5 | 370 | } |
916abb21 LP |
371 | |
372 | if (path) { | |
373 | char fpath[PATH_MAX]; | |
374 | struct stat a, b; | |
375 | ||
be8f4e9e | 376 | assert_return(path_is_absolute(path), -EINVAL); |
916abb21 LP |
377 | |
378 | if (fstat(fd, &a) < 0) | |
379 | return -errno; | |
380 | ||
381 | strncpy(stpcpy(fpath, "/dev/mqueue"), path, sizeof(fpath) - 12); | |
382 | fpath[sizeof(fpath)-1] = 0; | |
383 | ||
384 | if (stat(fpath, &b) < 0) | |
385 | return -errno; | |
386 | ||
387 | if (a.st_dev != b.st_dev || | |
388 | a.st_ino != b.st_ino) | |
389 | return 0; | |
390 | } | |
391 | ||
392 | return 1; | |
916abb21 LP |
393 | } |
394 | ||
a354329f LP |
395 | _public_ int sd_pid_notify_with_fds(pid_t pid, int unset_environment, const char *state, const int *fds, unsigned n_fds) { |
396 | union sockaddr_union sockaddr = { | |
397 | .sa.sa_family = AF_UNIX, | |
398 | }; | |
399 | struct iovec iovec = { | |
400 | .iov_base = (char*) state, | |
401 | }; | |
402 | struct msghdr msghdr = { | |
403 | .msg_iov = &iovec, | |
404 | .msg_iovlen = 1, | |
405 | .msg_name = &sockaddr, | |
406 | }; | |
a354329f LP |
407 | _cleanup_close_ int fd = -1; |
408 | struct cmsghdr *cmsg = NULL; | |
409 | const char *e; | |
64144440 | 410 | bool have_pid; |
be8f4e9e | 411 | int r; |
8c47c732 LP |
412 | |
413 | if (!state) { | |
414 | r = -EINVAL; | |
415 | goto finish; | |
416 | } | |
417 | ||
a354329f LP |
418 | if (n_fds > 0 && !fds) { |
419 | r = -EINVAL; | |
420 | goto finish; | |
421 | } | |
422 | ||
50425d16 MS |
423 | e = getenv("NOTIFY_SOCKET"); |
424 | if (!e) | |
08bfb810 | 425 | return 0; |
8c47c732 LP |
426 | |
427 | /* Must be an abstract socket, or an absolute path */ | |
428 | if ((e[0] != '@' && e[0] != '/') || e[1] == 0) { | |
429 | r = -EINVAL; | |
430 | goto finish; | |
431 | } | |
432 | ||
50425d16 MS |
433 | fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0); |
434 | if (fd < 0) { | |
8c47c732 LP |
435 | r = -errno; |
436 | goto finish; | |
437 | } | |
438 | ||
a354329f | 439 | iovec.iov_len = strlen(state); |
8c47c732 | 440 | |
a354329f | 441 | strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path)); |
8c47c732 LP |
442 | if (sockaddr.un.sun_path[0] == '@') |
443 | sockaddr.un.sun_path[0] = 0; | |
444 | ||
0e098b15 | 445 | msghdr.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(e); |
a013bd94 LP |
446 | if (msghdr.msg_namelen > sizeof(struct sockaddr_un)) |
447 | msghdr.msg_namelen = sizeof(struct sockaddr_un); | |
448 | ||
64144440 | 449 | have_pid = pid != 0 && pid != getpid(); |
d4a144fa | 450 | |
64144440 | 451 | if (n_fds > 0 || have_pid) { |
a5bd3c32 | 452 | /* CMSG_SPACE(0) may return value different then zero, which results in miscalculated controllen. */ |
c463a6f1 LP |
453 | msghdr.msg_controllen = |
454 | (n_fds > 0 ? CMSG_SPACE(sizeof(int) * n_fds) : 0) + | |
455 | (have_pid ? CMSG_SPACE(sizeof(struct ucred)) : 0); | |
456 | ||
40f44238 | 457 | msghdr.msg_control = alloca0(msghdr.msg_controllen); |
a354329f LP |
458 | |
459 | cmsg = CMSG_FIRSTHDR(&msghdr); | |
64144440 ZJS |
460 | if (n_fds > 0) { |
461 | cmsg->cmsg_level = SOL_SOCKET; | |
462 | cmsg->cmsg_type = SCM_RIGHTS; | |
463 | cmsg->cmsg_len = CMSG_LEN(sizeof(int) * n_fds); | |
a354329f | 464 | |
64144440 | 465 | memcpy(CMSG_DATA(cmsg), fds, sizeof(int) * n_fds); |
be8f4e9e | 466 | |
64144440 ZJS |
467 | if (have_pid) |
468 | assert_se(cmsg = CMSG_NXTHDR(&msghdr, cmsg)); | |
469 | } | |
a354329f | 470 | |
64144440 ZJS |
471 | if (have_pid) { |
472 | struct ucred *ucred; | |
be8f4e9e | 473 | |
64144440 ZJS |
474 | cmsg->cmsg_level = SOL_SOCKET; |
475 | cmsg->cmsg_type = SCM_CREDENTIALS; | |
476 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred)); | |
be8f4e9e | 477 | |
64144440 ZJS |
478 | ucred = (struct ucred*) CMSG_DATA(cmsg); |
479 | ucred->pid = pid; | |
480 | ucred->uid = getuid(); | |
481 | ucred->gid = getgid(); | |
482 | } | |
be8f4e9e LP |
483 | } |
484 | ||
485 | /* First try with fake ucred data, as requested */ | |
486 | if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) >= 0) { | |
487 | r = 1; | |
8c47c732 LP |
488 | goto finish; |
489 | } | |
490 | ||
a354329f | 491 | /* If that failed, try with our own ucred instead */ |
64144440 ZJS |
492 | if (have_pid) { |
493 | msghdr.msg_controllen -= CMSG_SPACE(sizeof(struct ucred)); | |
494 | if (msghdr.msg_controllen == 0) | |
a354329f | 495 | msghdr.msg_control = NULL; |
be8f4e9e LP |
496 | |
497 | if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) >= 0) { | |
498 | r = 1; | |
499 | goto finish; | |
500 | } | |
501 | } | |
502 | ||
503 | r = -errno; | |
8c47c732 LP |
504 | |
505 | finish: | |
506 | if (unset_environment) | |
507 | unsetenv("NOTIFY_SOCKET"); | |
508 | ||
8c47c732 | 509 | return r; |
8c47c732 LP |
510 | } |
511 | ||
a354329f LP |
512 | _public_ int sd_pid_notify(pid_t pid, int unset_environment, const char *state) { |
513 | return sd_pid_notify_with_fds(pid, unset_environment, state, NULL, 0); | |
514 | } | |
515 | ||
be8f4e9e | 516 | _public_ int sd_notify(int unset_environment, const char *state) { |
a354329f | 517 | return sd_pid_notify_with_fds(0, unset_environment, state, NULL, 0); |
be8f4e9e LP |
518 | } |
519 | ||
520 | _public_ int sd_pid_notifyf(pid_t pid, int unset_environment, const char *format, ...) { | |
521 | _cleanup_free_ char *p = NULL; | |
522 | int r; | |
523 | ||
524 | if (format) { | |
525 | va_list ap; | |
526 | ||
527 | va_start(ap, format); | |
528 | r = vasprintf(&p, format, ap); | |
529 | va_end(ap); | |
530 | ||
531 | if (r < 0 || !p) | |
532 | return -ENOMEM; | |
533 | } | |
534 | ||
535 | return sd_pid_notify(pid, unset_environment, p); | |
536 | } | |
537 | ||
0ebee881 | 538 | _public_ int sd_notifyf(int unset_environment, const char *format, ...) { |
be8f4e9e | 539 | _cleanup_free_ char *p = NULL; |
8c47c732 LP |
540 | int r; |
541 | ||
be8f4e9e LP |
542 | if (format) { |
543 | va_list ap; | |
8c47c732 | 544 | |
be8f4e9e LP |
545 | va_start(ap, format); |
546 | r = vasprintf(&p, format, ap); | |
547 | va_end(ap); | |
8c47c732 | 548 | |
be8f4e9e LP |
549 | if (r < 0 || !p) |
550 | return -ENOMEM; | |
551 | } | |
8c47c732 | 552 | |
be8f4e9e | 553 | return sd_pid_notify(0, unset_environment, p); |
8c47c732 | 554 | } |
40473a70 | 555 | |
0ebee881 | 556 | _public_ int sd_booted(void) { |
66e41181 LP |
557 | /* We test whether the runtime unit file directory has been |
558 | * created. This takes place in mount-setup.c, so is | |
559 | * guaranteed to happen very early during boot. */ | |
40473a70 | 560 | |
31021ba0 | 561 | return laccess("/run/systemd/system/", F_OK) >= 0; |
40473a70 | 562 | } |
09812eb7 | 563 | |
0ebee881 | 564 | _public_ int sd_watchdog_enabled(int unset_environment, uint64_t *usec) { |
a9becdd6 | 565 | const char *s, *p = ""; /* p is set to dummy value to do unsetting */ |
be8f4e9e | 566 | uint64_t u; |
a9becdd6 | 567 | int r = 0; |
09812eb7 | 568 | |
a9becdd6 ZJS |
569 | s = getenv("WATCHDOG_USEC"); |
570 | if (!s) | |
09812eb7 | 571 | goto finish; |
09812eb7 | 572 | |
a9becdd6 | 573 | r = safe_atou64(s, &u); |
be8f4e9e | 574 | if (r < 0) |
09812eb7 | 575 | goto finish; |
a9becdd6 | 576 | if (u <= 0) { |
09812eb7 LP |
577 | r = -EINVAL; |
578 | goto finish; | |
579 | } | |
580 | ||
a9becdd6 ZJS |
581 | p = getenv("WATCHDOG_PID"); |
582 | if (p) { | |
583 | pid_t pid; | |
584 | ||
585 | r = parse_pid(p, &pid); | |
586 | if (r < 0) | |
587 | goto finish; | |
588 | ||
589 | /* Is this for us? */ | |
590 | if (getpid() != pid) { | |
591 | r = 0; | |
592 | goto finish; | |
593 | } | |
09812eb7 LP |
594 | } |
595 | ||
596 | if (usec) | |
be8f4e9e | 597 | *usec = u; |
09812eb7 LP |
598 | |
599 | r = 1; | |
600 | ||
601 | finish: | |
a9becdd6 | 602 | if (unset_environment && s) |
09812eb7 | 603 | unsetenv("WATCHDOG_USEC"); |
a9becdd6 ZJS |
604 | if (unset_environment && p) |
605 | unsetenv("WATCHDOG_PID"); | |
09812eb7 LP |
606 | |
607 | return r; | |
09812eb7 | 608 | } |