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7fafc032 | 1 | /* |
1298001e | 2 | * Copyright (C) 2004-2012 Kay Sievers <kay@vrfy.org> |
2f6cbd19 | 3 | * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca> |
bb38678e SJR |
4 | * Copyright (C) 2009 Canonical Ltd. |
5 | * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com> | |
7fafc032 | 6 | * |
55e9959b KS |
7 | * This program is free software: you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, either version 2 of the License, or | |
10 | * (at your option) any later version. | |
7fafc032 | 11 | * |
55e9959b KS |
12 | * This program is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
7fafc032 | 16 | * |
55e9959b KS |
17 | * You should have received a copy of the GNU General Public License |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
7fafc032 KS |
19 | */ |
20 | ||
a695feae | 21 | #include <stddef.h> |
7fafc032 KS |
22 | #include <signal.h> |
23 | #include <unistd.h> | |
24 | #include <errno.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
c3804728 | 27 | #include <stdbool.h> |
7fafc032 | 28 | #include <string.h> |
085cce37 | 29 | #include <ctype.h> |
085cce37 | 30 | #include <fcntl.h> |
0b3dfb3d | 31 | #include <time.h> |
b52a01ee | 32 | #include <getopt.h> |
78230c0d | 33 | #include <dirent.h> |
820fc48f | 34 | #include <sys/time.h> |
1e03b754 KS |
35 | #include <sys/prctl.h> |
36 | #include <sys/socket.h> | |
a65aa40f | 37 | #include <sys/un.h> |
1e03b754 | 38 | #include <sys/signalfd.h> |
ff2c503d | 39 | #include <sys/epoll.h> |
3210a72b | 40 | #include <sys/poll.h> |
138068d6 | 41 | #include <sys/wait.h> |
dc117daa | 42 | #include <sys/stat.h> |
c895fd00 | 43 | #include <sys/ioctl.h> |
01618658 | 44 | #include <sys/inotify.h> |
761dfddc | 45 | #include <sys/utsname.h> |
7fafc032 KS |
46 | |
47 | #include "udev.h" | |
392ef7a2 | 48 | #include "sd-daemon.h" |
194bbe33 | 49 | #include "cgroup-util.h" |
5ba2dc25 | 50 | #include "dev-setup.h" |
a5c32cff | 51 | #include "fileio.h" |
7fafc032 | 52 | |
c3804728 | 53 | static bool debug; |
9e8fe79b | 54 | |
80df994c | 55 | void udev_main_log(struct udev *udev, int priority, |
912541b0 KS |
56 | const char *file, int line, const char *fn, |
57 | const char *format, va_list args) | |
7d563a17 | 58 | { |
baa30fbc | 59 | log_metav(priority, file, line, fn, format, args); |
7d563a17 KS |
60 | } |
61 | ||
d7ddce18 | 62 | static struct udev_rules *rules; |
f503f6b2 | 63 | static struct udev_queue_export *udev_queue_export; |
d59f11e1 | 64 | static struct udev_ctrl *udev_ctrl; |
1e03b754 | 65 | static struct udev_monitor *monitor; |
3c6ee190 | 66 | static int worker_watch[2] = { -1, -1 }; |
ff2c503d KS |
67 | static int fd_signal = -1; |
68 | static int fd_ep = -1; | |
69 | static int fd_inotify = -1; | |
c3804728 | 70 | static bool stop_exec_queue; |
7c85d636 | 71 | static bool reload; |
87d55ff6 KS |
72 | static int children; |
73 | static int children_max; | |
c830e98d | 74 | static int exec_delay; |
2181d30a | 75 | static sigset_t sigmask_orig; |
ff2c503d KS |
76 | static UDEV_LIST(event_list); |
77 | static UDEV_LIST(worker_list); | |
194bbe33 | 78 | char *udev_cgroup; |
c3804728 | 79 | static bool udev_exit; |
1e03b754 | 80 | |
1e03b754 | 81 | enum event_state { |
912541b0 KS |
82 | EVENT_UNDEF, |
83 | EVENT_QUEUED, | |
84 | EVENT_RUNNING, | |
1e03b754 KS |
85 | }; |
86 | ||
87 | struct event { | |
912541b0 KS |
88 | struct udev_list_node node; |
89 | struct udev *udev; | |
90 | struct udev_device *dev; | |
91 | enum event_state state; | |
92 | int exitcode; | |
93 | unsigned long long int delaying_seqnum; | |
94 | unsigned long long int seqnum; | |
95 | const char *devpath; | |
96 | size_t devpath_len; | |
97 | const char *devpath_old; | |
98 | dev_t devnum; | |
912541b0 | 99 | int ifindex; |
ea6039a3 | 100 | bool is_block; |
d8d4bee7 | 101 | #ifdef HAVE_FIRMWARE |
ea6039a3 | 102 | bool nodelay; |
61e536e1 | 103 | #endif |
1e03b754 KS |
104 | }; |
105 | ||
b27ee00b | 106 | static inline struct event *node_to_event(struct udev_list_node *node) |
7e027927 | 107 | { |
b27ee00b | 108 | return container_of(node, struct event, node); |
1e03b754 KS |
109 | } |
110 | ||
ff2c503d KS |
111 | static void event_queue_cleanup(struct udev *udev, enum event_state type); |
112 | ||
1e03b754 | 113 | enum worker_state { |
912541b0 KS |
114 | WORKER_UNDEF, |
115 | WORKER_RUNNING, | |
116 | WORKER_IDLE, | |
117 | WORKER_KILLED, | |
1e03b754 KS |
118 | }; |
119 | ||
120 | struct worker { | |
912541b0 KS |
121 | struct udev_list_node node; |
122 | struct udev *udev; | |
123 | int refcount; | |
124 | pid_t pid; | |
125 | struct udev_monitor *monitor; | |
126 | enum worker_state state; | |
127 | struct event *event; | |
40fe8b11 | 128 | usec_t event_start_usec; |
1e03b754 KS |
129 | }; |
130 | ||
131 | /* passed from worker to main process */ | |
132 | struct worker_message { | |
912541b0 KS |
133 | pid_t pid; |
134 | int exitcode; | |
1e03b754 KS |
135 | }; |
136 | ||
b27ee00b | 137 | static inline struct worker *node_to_worker(struct udev_list_node *node) |
1e03b754 | 138 | { |
b27ee00b | 139 | return container_of(node, struct worker, node); |
7e027927 KS |
140 | } |
141 | ||
ff2c503d | 142 | static void event_queue_delete(struct event *event, bool export) |
fc465079 | 143 | { |
912541b0 KS |
144 | udev_list_node_remove(&event->node); |
145 | ||
146 | if (export) { | |
147 | udev_queue_export_device_finished(udev_queue_export, event->dev); | |
baa30fbc | 148 | log_debug("seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode); |
912541b0 KS |
149 | } |
150 | udev_device_unref(event->dev); | |
151 | free(event); | |
aa8734ff | 152 | } |
7a770250 | 153 | |
bc113de9 KS |
154 | static struct worker *worker_ref(struct worker *worker) |
155 | { | |
912541b0 KS |
156 | worker->refcount++; |
157 | return worker; | |
bc113de9 KS |
158 | } |
159 | ||
ff2c503d KS |
160 | static void worker_cleanup(struct worker *worker) |
161 | { | |
912541b0 KS |
162 | udev_list_node_remove(&worker->node); |
163 | udev_monitor_unref(worker->monitor); | |
164 | children--; | |
165 | free(worker); | |
ff2c503d KS |
166 | } |
167 | ||
1e03b754 KS |
168 | static void worker_unref(struct worker *worker) |
169 | { | |
912541b0 KS |
170 | worker->refcount--; |
171 | if (worker->refcount > 0) | |
172 | return; | |
baa30fbc | 173 | log_debug("worker [%u] cleaned up\n", worker->pid); |
912541b0 | 174 | worker_cleanup(worker); |
ff2c503d KS |
175 | } |
176 | ||
177 | static void worker_list_cleanup(struct udev *udev) | |
178 | { | |
912541b0 | 179 | struct udev_list_node *loop, *tmp; |
ff2c503d | 180 | |
912541b0 KS |
181 | udev_list_node_foreach_safe(loop, tmp, &worker_list) { |
182 | struct worker *worker = node_to_worker(loop); | |
ff2c503d | 183 | |
912541b0 KS |
184 | worker_cleanup(worker); |
185 | } | |
fc465079 KS |
186 | } |
187 | ||
1e03b754 | 188 | static void worker_new(struct event *event) |
7fafc032 | 189 | { |
912541b0 KS |
190 | struct udev *udev = event->udev; |
191 | struct worker *worker; | |
192 | struct udev_monitor *worker_monitor; | |
193 | pid_t pid; | |
194 | ||
195 | /* listen for new events */ | |
196 | worker_monitor = udev_monitor_new_from_netlink(udev, NULL); | |
197 | if (worker_monitor == NULL) | |
198 | return; | |
199 | /* allow the main daemon netlink address to send devices to the worker */ | |
200 | udev_monitor_allow_unicast_sender(worker_monitor, monitor); | |
201 | udev_monitor_enable_receiving(worker_monitor); | |
202 | ||
203 | worker = calloc(1, sizeof(struct worker)); | |
204 | if (worker == NULL) { | |
205 | udev_monitor_unref(worker_monitor); | |
206 | return; | |
207 | } | |
208 | /* worker + event reference */ | |
209 | worker->refcount = 2; | |
210 | worker->udev = udev; | |
211 | ||
212 | pid = fork(); | |
213 | switch (pid) { | |
214 | case 0: { | |
215 | struct udev_device *dev = NULL; | |
216 | int fd_monitor; | |
217 | struct epoll_event ep_signal, ep_monitor; | |
218 | sigset_t mask; | |
219 | int rc = EXIT_SUCCESS; | |
220 | ||
43095991 | 221 | /* take initial device from queue */ |
912541b0 KS |
222 | dev = event->dev; |
223 | event->dev = NULL; | |
224 | ||
225 | free(worker); | |
226 | worker_list_cleanup(udev); | |
227 | event_queue_cleanup(udev, EVENT_UNDEF); | |
228 | udev_queue_export_unref(udev_queue_export); | |
229 | udev_monitor_unref(monitor); | |
230 | udev_ctrl_unref(udev_ctrl); | |
231 | close(fd_signal); | |
232 | close(fd_ep); | |
233 | close(worker_watch[READ_END]); | |
234 | ||
235 | sigfillset(&mask); | |
236 | fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); | |
237 | if (fd_signal < 0) { | |
baa30fbc | 238 | log_error("error creating signalfd %m\n"); |
912541b0 KS |
239 | rc = 2; |
240 | goto out; | |
241 | } | |
242 | ||
243 | fd_ep = epoll_create1(EPOLL_CLOEXEC); | |
244 | if (fd_ep < 0) { | |
baa30fbc | 245 | log_error("error creating epoll fd: %m\n"); |
912541b0 KS |
246 | rc = 3; |
247 | goto out; | |
248 | } | |
249 | ||
250 | memset(&ep_signal, 0, sizeof(struct epoll_event)); | |
251 | ep_signal.events = EPOLLIN; | |
252 | ep_signal.data.fd = fd_signal; | |
253 | ||
254 | fd_monitor = udev_monitor_get_fd(worker_monitor); | |
255 | memset(&ep_monitor, 0, sizeof(struct epoll_event)); | |
256 | ep_monitor.events = EPOLLIN; | |
257 | ep_monitor.data.fd = fd_monitor; | |
258 | ||
259 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || | |
260 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) { | |
baa30fbc | 261 | log_error("fail to add fds to epoll: %m\n"); |
912541b0 KS |
262 | rc = 4; |
263 | goto out; | |
264 | } | |
265 | ||
266 | /* request TERM signal if parent exits */ | |
267 | prctl(PR_SET_PDEATHSIG, SIGTERM); | |
268 | ||
145dae7e | 269 | /* reset OOM score, we only protect the main daemon */ |
574d5f2d | 270 | write_string_file("/proc/self/oom_score_adj", "0"); |
145dae7e | 271 | |
912541b0 KS |
272 | for (;;) { |
273 | struct udev_event *udev_event; | |
274 | struct worker_message msg; | |
275 | int err; | |
276 | ||
baa30fbc | 277 | log_debug("seq %llu running\n", udev_device_get_seqnum(dev)); |
912541b0 KS |
278 | udev_event = udev_event_new(dev); |
279 | if (udev_event == NULL) { | |
280 | rc = 5; | |
281 | goto out; | |
282 | } | |
283 | ||
284 | /* needed for SIGCHLD/SIGTERM in spawn() */ | |
285 | udev_event->fd_signal = fd_signal; | |
286 | ||
287 | if (exec_delay > 0) | |
288 | udev_event->exec_delay = exec_delay; | |
289 | ||
290 | /* apply rules, create node, symlinks */ | |
291 | err = udev_event_execute_rules(udev_event, rules, &sigmask_orig); | |
292 | ||
293 | if (err == 0) | |
294 | udev_event_execute_run(udev_event, &sigmask_orig); | |
295 | ||
296 | /* apply/restore inotify watch */ | |
297 | if (err == 0 && udev_event->inotify_watch) { | |
298 | udev_watch_begin(udev, dev); | |
299 | udev_device_update_db(dev); | |
300 | } | |
301 | ||
302 | /* send processed event back to libudev listeners */ | |
303 | udev_monitor_send_device(worker_monitor, NULL, dev); | |
304 | ||
305 | /* send udevd the result of the event execution */ | |
306 | memset(&msg, 0, sizeof(struct worker_message)); | |
307 | if (err != 0) | |
308 | msg.exitcode = err; | |
309 | msg.pid = getpid(); | |
310 | send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0); | |
311 | ||
baa30fbc | 312 | log_debug("seq %llu processed with %i\n", udev_device_get_seqnum(dev), err); |
912541b0 KS |
313 | |
314 | udev_device_unref(dev); | |
315 | dev = NULL; | |
316 | ||
317 | if (udev_event->sigterm) { | |
318 | udev_event_unref(udev_event); | |
319 | goto out; | |
320 | } | |
321 | ||
322 | udev_event_unref(udev_event); | |
323 | ||
324 | /* wait for more device messages from main udevd, or term signal */ | |
325 | while (dev == NULL) { | |
326 | struct epoll_event ev[4]; | |
327 | int fdcount; | |
328 | int i; | |
329 | ||
8fef0ff2 | 330 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1); |
912541b0 KS |
331 | if (fdcount < 0) { |
332 | if (errno == EINTR) | |
333 | continue; | |
baa30fbc | 334 | log_error("failed to poll: %m\n"); |
912541b0 KS |
335 | goto out; |
336 | } | |
337 | ||
338 | for (i = 0; i < fdcount; i++) { | |
339 | if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) { | |
340 | dev = udev_monitor_receive_device(worker_monitor); | |
341 | break; | |
342 | } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) { | |
343 | struct signalfd_siginfo fdsi; | |
344 | ssize_t size; | |
345 | ||
346 | size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
347 | if (size != sizeof(struct signalfd_siginfo)) | |
348 | continue; | |
349 | switch (fdsi.ssi_signo) { | |
350 | case SIGTERM: | |
351 | goto out; | |
352 | } | |
353 | } | |
354 | } | |
355 | } | |
356 | } | |
82063a88 | 357 | out: |
912541b0 KS |
358 | udev_device_unref(dev); |
359 | if (fd_signal >= 0) | |
360 | close(fd_signal); | |
361 | if (fd_ep >= 0) | |
362 | close(fd_ep); | |
363 | close(fd_inotify); | |
364 | close(worker_watch[WRITE_END]); | |
365 | udev_rules_unref(rules); | |
e64fae55 | 366 | udev_builtin_exit(udev); |
912541b0 KS |
367 | udev_monitor_unref(worker_monitor); |
368 | udev_unref(udev); | |
baa30fbc | 369 | log_close(); |
912541b0 KS |
370 | exit(rc); |
371 | } | |
372 | case -1: | |
373 | udev_monitor_unref(worker_monitor); | |
374 | event->state = EVENT_QUEUED; | |
375 | free(worker); | |
baa30fbc | 376 | log_error("fork of child failed: %m\n"); |
912541b0 KS |
377 | break; |
378 | default: | |
379 | /* close monitor, but keep address around */ | |
380 | udev_monitor_disconnect(worker_monitor); | |
381 | worker->monitor = worker_monitor; | |
382 | worker->pid = pid; | |
383 | worker->state = WORKER_RUNNING; | |
40fe8b11 | 384 | worker->event_start_usec = now(CLOCK_MONOTONIC); |
912541b0 KS |
385 | worker->event = event; |
386 | event->state = EVENT_RUNNING; | |
387 | udev_list_node_append(&worker->node, &worker_list); | |
388 | children++; | |
baa30fbc | 389 | log_debug("seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid); |
912541b0 KS |
390 | break; |
391 | } | |
7fafc032 KS |
392 | } |
393 | ||
57c6f8ae | 394 | static void event_run(struct event *event) |
fc465079 | 395 | { |
912541b0 KS |
396 | struct udev_list_node *loop; |
397 | ||
398 | udev_list_node_foreach(loop, &worker_list) { | |
399 | struct worker *worker = node_to_worker(loop); | |
400 | ssize_t count; | |
401 | ||
402 | if (worker->state != WORKER_IDLE) | |
403 | continue; | |
404 | ||
405 | count = udev_monitor_send_device(monitor, worker->monitor, event->dev); | |
406 | if (count < 0) { | |
baa30fbc | 407 | log_error("worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count); |
912541b0 KS |
408 | kill(worker->pid, SIGKILL); |
409 | worker->state = WORKER_KILLED; | |
410 | continue; | |
411 | } | |
412 | worker_ref(worker); | |
413 | worker->event = event; | |
414 | worker->state = WORKER_RUNNING; | |
40fe8b11 | 415 | worker->event_start_usec = now(CLOCK_MONOTONIC); |
912541b0 KS |
416 | event->state = EVENT_RUNNING; |
417 | return; | |
418 | } | |
419 | ||
420 | if (children >= children_max) { | |
421 | if (children_max > 1) | |
baa30fbc | 422 | log_debug("maximum number (%i) of children reached\n", children); |
912541b0 KS |
423 | return; |
424 | } | |
425 | ||
426 | /* start new worker and pass initial device */ | |
427 | worker_new(event); | |
1e03b754 KS |
428 | } |
429 | ||
40929a02 | 430 | static int event_queue_insert(struct udev_device *dev) |
1e03b754 | 431 | { |
912541b0 KS |
432 | struct event *event; |
433 | ||
434 | event = calloc(1, sizeof(struct event)); | |
435 | if (event == NULL) | |
436 | return -1; | |
437 | ||
438 | event->udev = udev_device_get_udev(dev); | |
439 | event->dev = dev; | |
440 | event->seqnum = udev_device_get_seqnum(dev); | |
441 | event->devpath = udev_device_get_devpath(dev); | |
442 | event->devpath_len = strlen(event->devpath); | |
443 | event->devpath_old = udev_device_get_devpath_old(dev); | |
444 | event->devnum = udev_device_get_devnum(dev); | |
ea6039a3 | 445 | event->is_block = streq("block", udev_device_get_subsystem(dev)); |
912541b0 | 446 | event->ifindex = udev_device_get_ifindex(dev); |
d8d4bee7 | 447 | #ifdef HAVE_FIRMWARE |
ea6039a3 KS |
448 | if (streq(udev_device_get_subsystem(dev), "firmware")) |
449 | event->nodelay = true; | |
61e536e1 | 450 | #endif |
912541b0 KS |
451 | |
452 | udev_queue_export_device_queued(udev_queue_export, dev); | |
baa30fbc | 453 | log_debug("seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev), |
912541b0 KS |
454 | udev_device_get_action(dev), udev_device_get_subsystem(dev)); |
455 | ||
456 | event->state = EVENT_QUEUED; | |
457 | udev_list_node_append(&event->node, &event_list); | |
458 | return 0; | |
fc465079 KS |
459 | } |
460 | ||
194bbe33 | 461 | static void worker_kill(struct udev *udev) |
1e03b754 | 462 | { |
912541b0 | 463 | struct udev_list_node *loop; |
1e03b754 | 464 | |
912541b0 KS |
465 | udev_list_node_foreach(loop, &worker_list) { |
466 | struct worker *worker = node_to_worker(loop); | |
1e03b754 | 467 | |
912541b0 KS |
468 | if (worker->state == WORKER_KILLED) |
469 | continue; | |
1e03b754 | 470 | |
912541b0 KS |
471 | worker->state = WORKER_KILLED; |
472 | kill(worker->pid, SIGTERM); | |
473 | } | |
1e03b754 KS |
474 | } |
475 | ||
e3196993 | 476 | /* lookup event for identical, parent, child device */ |
19711e19 | 477 | static bool is_devpath_busy(struct event *event) |
7fafc032 | 478 | { |
912541b0 KS |
479 | struct udev_list_node *loop; |
480 | size_t common; | |
481 | ||
482 | /* check if queue contains events we depend on */ | |
483 | udev_list_node_foreach(loop, &event_list) { | |
484 | struct event *loop_event = node_to_event(loop); | |
485 | ||
486 | /* we already found a later event, earlier can not block us, no need to check again */ | |
487 | if (loop_event->seqnum < event->delaying_seqnum) | |
488 | continue; | |
489 | ||
490 | /* event we checked earlier still exists, no need to check again */ | |
491 | if (loop_event->seqnum == event->delaying_seqnum) | |
492 | return true; | |
493 | ||
494 | /* found ourself, no later event can block us */ | |
495 | if (loop_event->seqnum >= event->seqnum) | |
496 | break; | |
497 | ||
498 | /* check major/minor */ | |
499 | if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block) | |
500 | return true; | |
501 | ||
502 | /* check network device ifindex */ | |
503 | if (event->ifindex != 0 && event->ifindex == loop_event->ifindex) | |
504 | return true; | |
505 | ||
506 | /* check our old name */ | |
090be865 | 507 | if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) { |
912541b0 KS |
508 | event->delaying_seqnum = loop_event->seqnum; |
509 | return true; | |
510 | } | |
511 | ||
512 | /* compare devpath */ | |
513 | common = MIN(loop_event->devpath_len, event->devpath_len); | |
514 | ||
515 | /* one devpath is contained in the other? */ | |
516 | if (memcmp(loop_event->devpath, event->devpath, common) != 0) | |
517 | continue; | |
518 | ||
519 | /* identical device event found */ | |
520 | if (loop_event->devpath_len == event->devpath_len) { | |
521 | /* devices names might have changed/swapped in the meantime */ | |
522 | if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block)) | |
523 | continue; | |
524 | if (event->ifindex != 0 && event->ifindex != loop_event->ifindex) | |
525 | continue; | |
526 | event->delaying_seqnum = loop_event->seqnum; | |
527 | return true; | |
528 | } | |
529 | ||
d8d4bee7 | 530 | #ifdef HAVE_FIRMWARE |
ea6039a3 KS |
531 | /* allow to bypass the dependency tracking */ |
532 | if (event->nodelay) | |
533 | continue; | |
61e536e1 | 534 | #endif |
ea6039a3 | 535 | |
912541b0 KS |
536 | /* parent device event found */ |
537 | if (event->devpath[common] == '/') { | |
538 | event->delaying_seqnum = loop_event->seqnum; | |
539 | return true; | |
540 | } | |
541 | ||
542 | /* child device event found */ | |
543 | if (loop_event->devpath[common] == '/') { | |
544 | event->delaying_seqnum = loop_event->seqnum; | |
545 | return true; | |
546 | } | |
547 | ||
548 | /* no matching device */ | |
549 | continue; | |
550 | } | |
551 | ||
552 | return false; | |
7fafc032 KS |
553 | } |
554 | ||
ff2c503d | 555 | static void event_queue_start(struct udev *udev) |
7fafc032 | 556 | { |
912541b0 | 557 | struct udev_list_node *loop; |
8ab44e3f | 558 | |
912541b0 KS |
559 | udev_list_node_foreach(loop, &event_list) { |
560 | struct event *event = node_to_event(loop); | |
0bc74ea7 | 561 | |
912541b0 KS |
562 | if (event->state != EVENT_QUEUED) |
563 | continue; | |
0bc74ea7 | 564 | |
912541b0 | 565 | /* do not start event if parent or child event is still running */ |
baa30fbc | 566 | if (is_devpath_busy(event)) |
912541b0 | 567 | continue; |
fc465079 | 568 | |
912541b0 KS |
569 | event_run(event); |
570 | } | |
1e03b754 KS |
571 | } |
572 | ||
ff2c503d KS |
573 | static void event_queue_cleanup(struct udev *udev, enum event_state match_type) |
574 | { | |
912541b0 | 575 | struct udev_list_node *loop, *tmp; |
ff2c503d | 576 | |
912541b0 KS |
577 | udev_list_node_foreach_safe(loop, tmp, &event_list) { |
578 | struct event *event = node_to_event(loop); | |
ff2c503d | 579 | |
912541b0 KS |
580 | if (match_type != EVENT_UNDEF && match_type != event->state) |
581 | continue; | |
ff2c503d | 582 | |
912541b0 KS |
583 | event_queue_delete(event, false); |
584 | } | |
ff2c503d KS |
585 | } |
586 | ||
587 | static void worker_returned(int fd_worker) | |
1e03b754 | 588 | { |
912541b0 KS |
589 | for (;;) { |
590 | struct worker_message msg; | |
591 | ssize_t size; | |
592 | struct udev_list_node *loop; | |
593 | ||
594 | size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT); | |
595 | if (size != sizeof(struct worker_message)) | |
596 | break; | |
597 | ||
598 | /* lookup worker who sent the signal */ | |
599 | udev_list_node_foreach(loop, &worker_list) { | |
600 | struct worker *worker = node_to_worker(loop); | |
601 | ||
602 | if (worker->pid != msg.pid) | |
603 | continue; | |
604 | ||
605 | /* worker returned */ | |
e64fae55 KS |
606 | if (worker->event) { |
607 | worker->event->exitcode = msg.exitcode; | |
608 | event_queue_delete(worker->event, true); | |
609 | worker->event = NULL; | |
610 | } | |
912541b0 KS |
611 | if (worker->state != WORKER_KILLED) |
612 | worker->state = WORKER_IDLE; | |
613 | worker_unref(worker); | |
614 | break; | |
615 | } | |
616 | } | |
88f4b648 KS |
617 | } |
618 | ||
3b47c739 | 619 | /* receive the udevd message from userspace */ |
ff2c503d | 620 | static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl) |
7fafc032 | 621 | { |
912541b0 KS |
622 | struct udev *udev = udev_ctrl_get_udev(uctrl); |
623 | struct udev_ctrl_connection *ctrl_conn; | |
624 | struct udev_ctrl_msg *ctrl_msg = NULL; | |
625 | const char *str; | |
626 | int i; | |
627 | ||
628 | ctrl_conn = udev_ctrl_get_connection(uctrl); | |
629 | if (ctrl_conn == NULL) | |
630 | goto out; | |
631 | ||
632 | ctrl_msg = udev_ctrl_receive_msg(ctrl_conn); | |
633 | if (ctrl_msg == NULL) | |
634 | goto out; | |
635 | ||
636 | i = udev_ctrl_get_set_log_level(ctrl_msg); | |
637 | if (i >= 0) { | |
baa30fbc KS |
638 | log_debug("udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i); |
639 | log_set_max_level(i); | |
912541b0 | 640 | udev_set_log_priority(udev, i); |
194bbe33 | 641 | worker_kill(udev); |
912541b0 KS |
642 | } |
643 | ||
644 | if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { | |
baa30fbc | 645 | log_debug("udevd message (STOP_EXEC_QUEUE) received\n"); |
912541b0 KS |
646 | stop_exec_queue = true; |
647 | } | |
648 | ||
649 | if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) { | |
baa30fbc | 650 | log_debug("udevd message (START_EXEC_QUEUE) received\n"); |
912541b0 KS |
651 | stop_exec_queue = false; |
652 | } | |
653 | ||
654 | if (udev_ctrl_get_reload(ctrl_msg) > 0) { | |
baa30fbc | 655 | log_debug("udevd message (RELOAD) received\n"); |
912541b0 KS |
656 | reload = true; |
657 | } | |
658 | ||
659 | str = udev_ctrl_get_set_env(ctrl_msg); | |
660 | if (str != NULL) { | |
661 | char *key; | |
662 | ||
663 | key = strdup(str); | |
664 | if (key != NULL) { | |
665 | char *val; | |
666 | ||
667 | val = strchr(key, '='); | |
668 | if (val != NULL) { | |
669 | val[0] = '\0'; | |
670 | val = &val[1]; | |
671 | if (val[0] == '\0') { | |
baa30fbc | 672 | log_debug("udevd message (ENV) received, unset '%s'\n", key); |
912541b0 KS |
673 | udev_add_property(udev, key, NULL); |
674 | } else { | |
baa30fbc | 675 | log_debug("udevd message (ENV) received, set '%s=%s'\n", key, val); |
912541b0 KS |
676 | udev_add_property(udev, key, val); |
677 | } | |
678 | } else { | |
baa30fbc | 679 | log_error("wrong key format '%s'\n", key); |
912541b0 KS |
680 | } |
681 | free(key); | |
682 | } | |
194bbe33 | 683 | worker_kill(udev); |
912541b0 KS |
684 | } |
685 | ||
686 | i = udev_ctrl_get_set_children_max(ctrl_msg); | |
687 | if (i >= 0) { | |
baa30fbc | 688 | log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i); |
912541b0 KS |
689 | children_max = i; |
690 | } | |
691 | ||
692 | if (udev_ctrl_get_ping(ctrl_msg) > 0) | |
baa30fbc | 693 | log_debug("udevd message (SYNC) received\n"); |
912541b0 KS |
694 | |
695 | if (udev_ctrl_get_exit(ctrl_msg) > 0) { | |
baa30fbc | 696 | log_debug("udevd message (EXIT) received\n"); |
912541b0 KS |
697 | udev_exit = true; |
698 | /* keep reference to block the client until we exit */ | |
699 | udev_ctrl_connection_ref(ctrl_conn); | |
700 | } | |
ff2c503d | 701 | out: |
912541b0 KS |
702 | udev_ctrl_msg_unref(ctrl_msg); |
703 | return udev_ctrl_connection_unref(ctrl_conn); | |
88f4b648 | 704 | } |
4a231017 | 705 | |
bd284db1 SJR |
706 | /* read inotify messages */ |
707 | static int handle_inotify(struct udev *udev) | |
708 | { | |
912541b0 KS |
709 | int nbytes, pos; |
710 | char *buf; | |
711 | struct inotify_event *ev; | |
712 | ||
713 | if ((ioctl(fd_inotify, FIONREAD, &nbytes) < 0) || (nbytes <= 0)) | |
714 | return 0; | |
715 | ||
716 | buf = malloc(nbytes); | |
717 | if (buf == NULL) { | |
baa30fbc | 718 | log_error("error getting buffer for inotify\n"); |
912541b0 KS |
719 | return -1; |
720 | } | |
721 | ||
722 | nbytes = read(fd_inotify, buf, nbytes); | |
723 | ||
724 | for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) { | |
725 | struct udev_device *dev; | |
726 | ||
727 | ev = (struct inotify_event *)(buf + pos); | |
728 | dev = udev_watch_lookup(udev, ev->wd); | |
729 | if (dev != NULL) { | |
baa30fbc | 730 | log_debug("inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev)); |
912541b0 KS |
731 | if (ev->mask & IN_CLOSE_WRITE) { |
732 | char filename[UTIL_PATH_SIZE]; | |
733 | int fd; | |
734 | ||
baa30fbc | 735 | log_debug("device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev)); |
d5a89d7d | 736 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); |
912541b0 KS |
737 | fd = open(filename, O_WRONLY); |
738 | if (fd >= 0) { | |
739 | if (write(fd, "change", 6) < 0) | |
baa30fbc | 740 | log_debug("error writing uevent: %m\n"); |
912541b0 KS |
741 | close(fd); |
742 | } | |
743 | } | |
744 | if (ev->mask & IN_IGNORED) | |
745 | udev_watch_end(udev, dev); | |
746 | ||
747 | udev_device_unref(dev); | |
748 | } | |
749 | ||
750 | } | |
751 | ||
752 | free(buf); | |
753 | return 0; | |
bd284db1 SJR |
754 | } |
755 | ||
45798927 | 756 | static void handle_signal(struct udev *udev, int signo) |
7fafc032 | 757 | { |
912541b0 KS |
758 | switch (signo) { |
759 | case SIGINT: | |
760 | case SIGTERM: | |
761 | udev_exit = true; | |
762 | break; | |
763 | case SIGCHLD: | |
764 | for (;;) { | |
765 | pid_t pid; | |
766 | int status; | |
767 | struct udev_list_node *loop, *tmp; | |
768 | ||
769 | pid = waitpid(-1, &status, WNOHANG); | |
770 | if (pid <= 0) | |
771 | break; | |
772 | ||
773 | udev_list_node_foreach_safe(loop, tmp, &worker_list) { | |
774 | struct worker *worker = node_to_worker(loop); | |
775 | ||
776 | if (worker->pid != pid) | |
777 | continue; | |
baa30fbc | 778 | log_debug("worker [%u] exit\n", pid); |
912541b0 KS |
779 | |
780 | if (WIFEXITED(status)) { | |
781 | if (WEXITSTATUS(status) != 0) | |
baa30fbc | 782 | log_error("worker [%u] exit with return code %i\n", pid, WEXITSTATUS(status)); |
912541b0 | 783 | } else if (WIFSIGNALED(status)) { |
baa30fbc | 784 | log_error("worker [%u] terminated by signal %i (%s)\n", |
912541b0 KS |
785 | pid, WTERMSIG(status), strsignal(WTERMSIG(status))); |
786 | } else if (WIFSTOPPED(status)) { | |
baa30fbc | 787 | log_error("worker [%u] stopped\n", pid); |
912541b0 | 788 | } else if (WIFCONTINUED(status)) { |
baa30fbc | 789 | log_error("worker [%u] continued\n", pid); |
912541b0 | 790 | } else { |
baa30fbc | 791 | log_error("worker [%u] exit with status 0x%04x\n", pid, status); |
912541b0 KS |
792 | } |
793 | ||
794 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
e64fae55 | 795 | if (worker->event) { |
baa30fbc KS |
796 | log_error("worker [%u] failed while handling '%s'\n", |
797 | pid, worker->event->devpath); | |
912541b0 KS |
798 | worker->event->exitcode = -32; |
799 | event_queue_delete(worker->event, true); | |
800 | /* drop reference taken for state 'running' */ | |
801 | worker_unref(worker); | |
802 | } | |
803 | } | |
804 | worker_unref(worker); | |
805 | break; | |
806 | } | |
807 | } | |
808 | break; | |
809 | case SIGHUP: | |
810 | reload = true; | |
811 | break; | |
812 | } | |
f27125f9 | 813 | } |
814 | ||
7459bcdc KS |
815 | static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink) |
816 | { | |
912541b0 KS |
817 | int ctrl = -1, netlink = -1; |
818 | int fd, n; | |
819 | ||
820 | n = sd_listen_fds(true); | |
821 | if (n <= 0) | |
822 | return -1; | |
823 | ||
824 | for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { | |
825 | if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) { | |
826 | if (ctrl >= 0) | |
827 | return -1; | |
828 | ctrl = fd; | |
829 | continue; | |
830 | } | |
831 | ||
832 | if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) { | |
833 | if (netlink >= 0) | |
834 | return -1; | |
835 | netlink = fd; | |
836 | continue; | |
837 | } | |
838 | ||
839 | return -1; | |
840 | } | |
841 | ||
842 | if (ctrl < 0 || netlink < 0) | |
843 | return -1; | |
844 | ||
baa30fbc | 845 | log_debug("ctrl=%i netlink=%i\n", ctrl, netlink); |
912541b0 KS |
846 | *rctrl = ctrl; |
847 | *rnetlink = netlink; | |
848 | return 0; | |
7459bcdc KS |
849 | } |
850 | ||
e6f86cac KS |
851 | /* |
852 | * read the kernel commandline, in case we need to get into debug mode | |
853 | * udev.log-priority=<level> syslog priority | |
854 | * udev.children-max=<number of workers> events are fully serialized if set to 1 | |
855 | * udev.exec-delay=<number of seconds> delay execution of every executed program | |
856 | */ | |
857 | static void kernel_cmdline_options(struct udev *udev) | |
858 | { | |
859 | char *line, *w, *state; | |
860 | size_t l; | |
861 | ||
862 | if (read_one_line_file("/proc/cmdline", &line) < 0) | |
863 | return; | |
864 | ||
865 | FOREACH_WORD_QUOTED(w, l, line, state) { | |
866 | char *s, *opt; | |
867 | ||
868 | s = strndup(w, l); | |
869 | if (!s) | |
870 | break; | |
871 | ||
872 | /* accept the same options for the initrd, prefixed with "rd." */ | |
873 | if (in_initrd() && startswith(s, "rd.")) | |
874 | opt = s + 3; | |
875 | else | |
876 | opt = s; | |
877 | ||
023b9d33 KS |
878 | if (startswith(opt, "udev.log-priority=")) { |
879 | int prio; | |
e6f86cac | 880 | |
023b9d33 KS |
881 | prio = util_log_priority(opt + 18); |
882 | log_set_max_level(prio); | |
883 | udev_set_log_priority(udev, prio); | |
884 | } else if (startswith(opt, "udev.children-max=")) { | |
e6f86cac | 885 | children_max = strtoul(opt + 18, NULL, 0); |
023b9d33 | 886 | } else if (startswith(opt, "udev.exec-delay=")) { |
e6f86cac | 887 | exec_delay = strtoul(opt + 16, NULL, 0); |
023b9d33 | 888 | } |
e6f86cac KS |
889 | |
890 | free(s); | |
891 | } | |
892 | ||
893 | free(line); | |
894 | } | |
895 | ||
59345311 | 896 | int main(int argc, char *argv[]) |
c2cf4012 | 897 | { |
912541b0 | 898 | struct udev *udev; |
912541b0 KS |
899 | sigset_t mask; |
900 | int daemonize = false; | |
901 | int resolve_names = 1; | |
902 | static const struct option options[] = { | |
903 | { "daemon", no_argument, NULL, 'd' }, | |
904 | { "debug", no_argument, NULL, 'D' }, | |
905 | { "children-max", required_argument, NULL, 'c' }, | |
906 | { "exec-delay", required_argument, NULL, 'e' }, | |
907 | { "resolve-names", required_argument, NULL, 'N' }, | |
908 | { "help", no_argument, NULL, 'h' }, | |
909 | { "version", no_argument, NULL, 'V' }, | |
910 | {} | |
911 | }; | |
912 | int fd_ctrl = -1; | |
913 | int fd_netlink = -1; | |
914 | int fd_worker = -1; | |
915 | struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker; | |
916 | struct udev_ctrl_connection *ctrl_conn = NULL; | |
912541b0 KS |
917 | int rc = 1; |
918 | ||
919 | udev = udev_new(); | |
920 | if (udev == NULL) | |
921 | goto exit; | |
922 | ||
4b261568 | 923 | log_set_target(LOG_TARGET_AUTO); |
baa30fbc | 924 | log_parse_environment(); |
4b261568 | 925 | log_open(); |
912541b0 | 926 | udev_set_log_fn(udev, udev_main_log); |
baa30fbc | 927 | log_debug("version %s\n", VERSION); |
0f9963a8 | 928 | label_init("/dev"); |
912541b0 KS |
929 | |
930 | for (;;) { | |
931 | int option; | |
932 | ||
5bbbe461 | 933 | option = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL); |
912541b0 KS |
934 | if (option == -1) |
935 | break; | |
936 | ||
937 | switch (option) { | |
938 | case 'd': | |
939 | daemonize = true; | |
940 | break; | |
941 | case 'c': | |
942 | children_max = strtoul(optarg, NULL, 0); | |
943 | break; | |
944 | case 'e': | |
945 | exec_delay = strtoul(optarg, NULL, 0); | |
946 | break; | |
947 | case 'D': | |
948 | debug = true; | |
194bbe33 | 949 | log_set_max_level(LOG_DEBUG); |
7781e063 | 950 | udev_set_log_priority(udev, LOG_DEBUG); |
912541b0 KS |
951 | break; |
952 | case 'N': | |
090be865 | 953 | if (streq(optarg, "early")) { |
912541b0 | 954 | resolve_names = 1; |
090be865 | 955 | } else if (streq(optarg, "late")) { |
912541b0 | 956 | resolve_names = 0; |
090be865 | 957 | } else if (streq(optarg, "never")) { |
912541b0 KS |
958 | resolve_names = -1; |
959 | } else { | |
960 | fprintf(stderr, "resolve-names must be early, late or never\n"); | |
baa30fbc | 961 | log_error("resolve-names must be early, late or never\n"); |
912541b0 KS |
962 | goto exit; |
963 | } | |
964 | break; | |
965 | case 'h': | |
966 | printf("Usage: udevd OPTIONS\n" | |
967 | " --daemon\n" | |
968 | " --debug\n" | |
969 | " --children-max=<maximum number of workers>\n" | |
970 | " --exec-delay=<seconds to wait before executing RUN=>\n" | |
971 | " --resolve-names=early|late|never\n" | |
972 | " --version\n" | |
973 | " --help\n" | |
974 | "\n"); | |
975 | goto exit; | |
976 | case 'V': | |
977 | printf("%s\n", VERSION); | |
978 | goto exit; | |
979 | default: | |
980 | goto exit; | |
981 | } | |
982 | } | |
983 | ||
e6f86cac | 984 | kernel_cmdline_options(udev); |
912541b0 KS |
985 | |
986 | if (getuid() != 0) { | |
987 | fprintf(stderr, "root privileges required\n"); | |
baa30fbc | 988 | log_error("root privileges required\n"); |
912541b0 KS |
989 | goto exit; |
990 | } | |
991 | ||
992 | /* set umask before creating any file/directory */ | |
993 | chdir("/"); | |
994 | umask(022); | |
995 | ||
6ada823a | 996 | mkdir("/run/udev", 0755); |
912541b0 | 997 | |
01ed0e23 | 998 | dev_setup(NULL); |
912541b0 KS |
999 | |
1000 | /* before opening new files, make sure std{in,out,err} fds are in a sane state */ | |
1001 | if (daemonize) { | |
1002 | int fd; | |
1003 | ||
1004 | fd = open("/dev/null", O_RDWR); | |
1005 | if (fd >= 0) { | |
1006 | if (write(STDOUT_FILENO, 0, 0) < 0) | |
1007 | dup2(fd, STDOUT_FILENO); | |
1008 | if (write(STDERR_FILENO, 0, 0) < 0) | |
1009 | dup2(fd, STDERR_FILENO); | |
1010 | if (fd > STDERR_FILENO) | |
1011 | close(fd); | |
1012 | } else { | |
1013 | fprintf(stderr, "cannot open /dev/null\n"); | |
baa30fbc | 1014 | log_error("cannot open /dev/null\n"); |
912541b0 KS |
1015 | } |
1016 | } | |
1017 | ||
1018 | if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) { | |
c5315881 | 1019 | /* get control and netlink socket from systemd */ |
912541b0 KS |
1020 | udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl); |
1021 | if (udev_ctrl == NULL) { | |
baa30fbc | 1022 | log_error("error taking over udev control socket"); |
912541b0 KS |
1023 | rc = 1; |
1024 | goto exit; | |
1025 | } | |
1026 | ||
1027 | monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink); | |
1028 | if (monitor == NULL) { | |
baa30fbc | 1029 | log_error("error taking over netlink socket\n"); |
912541b0 KS |
1030 | rc = 3; |
1031 | goto exit; | |
1032 | } | |
194bbe33 KS |
1033 | |
1034 | /* get our own cgroup, we regularly kill everything udev has left behind */ | |
7027ff61 | 1035 | if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0) |
194bbe33 | 1036 | udev_cgroup = NULL; |
912541b0 KS |
1037 | } else { |
1038 | /* open control and netlink socket */ | |
1039 | udev_ctrl = udev_ctrl_new(udev); | |
1040 | if (udev_ctrl == NULL) { | |
1041 | fprintf(stderr, "error initializing udev control socket"); | |
baa30fbc | 1042 | log_error("error initializing udev control socket"); |
912541b0 KS |
1043 | rc = 1; |
1044 | goto exit; | |
1045 | } | |
1046 | fd_ctrl = udev_ctrl_get_fd(udev_ctrl); | |
1047 | ||
1048 | monitor = udev_monitor_new_from_netlink(udev, "kernel"); | |
1049 | if (monitor == NULL) { | |
1050 | fprintf(stderr, "error initializing netlink socket\n"); | |
baa30fbc | 1051 | log_error("error initializing netlink socket\n"); |
912541b0 KS |
1052 | rc = 3; |
1053 | goto exit; | |
1054 | } | |
1055 | fd_netlink = udev_monitor_get_fd(monitor); | |
1056 | } | |
1057 | ||
1058 | if (udev_monitor_enable_receiving(monitor) < 0) { | |
1059 | fprintf(stderr, "error binding netlink socket\n"); | |
baa30fbc | 1060 | log_error("error binding netlink socket\n"); |
912541b0 KS |
1061 | rc = 3; |
1062 | goto exit; | |
1063 | } | |
1064 | ||
1065 | if (udev_ctrl_enable_receiving(udev_ctrl) < 0) { | |
1066 | fprintf(stderr, "error binding udev control socket\n"); | |
baa30fbc | 1067 | log_error("error binding udev control socket\n"); |
912541b0 KS |
1068 | rc = 1; |
1069 | goto exit; | |
1070 | } | |
1071 | ||
1072 | udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024); | |
1073 | ||
1074 | /* create queue file before signalling 'ready', to make sure we block 'settle' */ | |
1075 | udev_queue_export = udev_queue_export_new(udev); | |
1076 | if (udev_queue_export == NULL) { | |
baa30fbc | 1077 | log_error("error creating queue file\n"); |
912541b0 KS |
1078 | goto exit; |
1079 | } | |
1080 | ||
1081 | if (daemonize) { | |
1082 | pid_t pid; | |
912541b0 KS |
1083 | |
1084 | pid = fork(); | |
1085 | switch (pid) { | |
1086 | case 0: | |
1087 | break; | |
1088 | case -1: | |
baa30fbc | 1089 | log_error("fork of daemon failed: %m\n"); |
912541b0 KS |
1090 | rc = 4; |
1091 | goto exit; | |
1092 | default: | |
1093 | rc = EXIT_SUCCESS; | |
1094 | goto exit_daemonize; | |
1095 | } | |
1096 | ||
1097 | setsid(); | |
1098 | ||
574d5f2d | 1099 | write_string_file("/proc/self/oom_score_adj", "-1000"); |
912541b0 KS |
1100 | } else { |
1101 | sd_notify(1, "READY=1"); | |
1102 | } | |
1103 | ||
c6eefe36 | 1104 | print_kmsg("starting version " VERSION "\n"); |
912541b0 KS |
1105 | |
1106 | if (!debug) { | |
1107 | int fd; | |
1108 | ||
1109 | fd = open("/dev/null", O_RDWR); | |
1110 | if (fd >= 0) { | |
1111 | dup2(fd, STDIN_FILENO); | |
1112 | dup2(fd, STDOUT_FILENO); | |
1113 | dup2(fd, STDERR_FILENO); | |
1114 | close(fd); | |
1115 | } | |
1116 | } | |
1117 | ||
1118 | fd_inotify = udev_watch_init(udev); | |
1119 | if (fd_inotify < 0) { | |
1120 | fprintf(stderr, "error initializing inotify\n"); | |
baa30fbc | 1121 | log_error("error initializing inotify\n"); |
912541b0 KS |
1122 | rc = 4; |
1123 | goto exit; | |
1124 | } | |
1125 | udev_watch_restore(udev); | |
1126 | ||
1127 | /* block and listen to all signals on signalfd */ | |
1128 | sigfillset(&mask); | |
1129 | sigprocmask(SIG_SETMASK, &mask, &sigmask_orig); | |
1130 | fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); | |
1131 | if (fd_signal < 0) { | |
1132 | fprintf(stderr, "error creating signalfd\n"); | |
baa30fbc | 1133 | log_error("error creating signalfd\n"); |
912541b0 KS |
1134 | rc = 5; |
1135 | goto exit; | |
1136 | } | |
1137 | ||
1138 | /* unnamed socket from workers to the main daemon */ | |
1139 | if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) { | |
1140 | fprintf(stderr, "error creating socketpair\n"); | |
baa30fbc | 1141 | log_error("error creating socketpair\n"); |
912541b0 KS |
1142 | rc = 6; |
1143 | goto exit; | |
1144 | } | |
1145 | fd_worker = worker_watch[READ_END]; | |
1146 | ||
1147 | udev_builtin_init(udev); | |
1148 | ||
1149 | rules = udev_rules_new(udev, resolve_names); | |
1150 | if (rules == NULL) { | |
baa30fbc | 1151 | log_error("error reading rules\n"); |
912541b0 KS |
1152 | goto exit; |
1153 | } | |
1154 | ||
1155 | memset(&ep_ctrl, 0, sizeof(struct epoll_event)); | |
1156 | ep_ctrl.events = EPOLLIN; | |
1157 | ep_ctrl.data.fd = fd_ctrl; | |
1158 | ||
1159 | memset(&ep_inotify, 0, sizeof(struct epoll_event)); | |
1160 | ep_inotify.events = EPOLLIN; | |
1161 | ep_inotify.data.fd = fd_inotify; | |
1162 | ||
1163 | memset(&ep_signal, 0, sizeof(struct epoll_event)); | |
1164 | ep_signal.events = EPOLLIN; | |
1165 | ep_signal.data.fd = fd_signal; | |
1166 | ||
1167 | memset(&ep_netlink, 0, sizeof(struct epoll_event)); | |
1168 | ep_netlink.events = EPOLLIN; | |
1169 | ep_netlink.data.fd = fd_netlink; | |
1170 | ||
1171 | memset(&ep_worker, 0, sizeof(struct epoll_event)); | |
1172 | ep_worker.events = EPOLLIN; | |
1173 | ep_worker.data.fd = fd_worker; | |
1174 | ||
1175 | fd_ep = epoll_create1(EPOLL_CLOEXEC); | |
1176 | if (fd_ep < 0) { | |
baa30fbc | 1177 | log_error("error creating epoll fd: %m\n"); |
912541b0 KS |
1178 | goto exit; |
1179 | } | |
1180 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 || | |
1181 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 || | |
1182 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || | |
1183 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 || | |
1184 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) { | |
baa30fbc | 1185 | log_error("fail to add fds to epoll: %m\n"); |
912541b0 KS |
1186 | goto exit; |
1187 | } | |
1188 | ||
912541b0 | 1189 | if (children_max <= 0) { |
8cc3f8c0 | 1190 | cpu_set_t cpu_set; |
912541b0 | 1191 | |
8cc3f8c0 HH |
1192 | children_max = 8; |
1193 | ||
1194 | if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) { | |
1195 | children_max += CPU_COUNT(&cpu_set) * 2; | |
1196 | } | |
912541b0 | 1197 | } |
baa30fbc | 1198 | log_debug("set children_max to %u\n", children_max); |
912541b0 | 1199 | |
84b6ad70 TG |
1200 | rc = udev_rules_apply_static_dev_perms(rules); |
1201 | if (rc < 0) | |
1202 | log_error("failed to apply permissions on static device nodes - %s\n", strerror(-rc)); | |
912541b0 KS |
1203 | |
1204 | udev_list_node_init(&event_list); | |
1205 | udev_list_node_init(&worker_list); | |
1206 | ||
1207 | for (;;) { | |
40fe8b11 | 1208 | static usec_t last_usec; |
912541b0 KS |
1209 | struct epoll_event ev[8]; |
1210 | int fdcount; | |
1211 | int timeout; | |
1212 | bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl; | |
1213 | int i; | |
1214 | ||
1215 | if (udev_exit) { | |
1216 | /* close sources of new events and discard buffered events */ | |
1217 | if (fd_ctrl >= 0) { | |
1218 | epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL); | |
1219 | fd_ctrl = -1; | |
1220 | } | |
1221 | if (monitor != NULL) { | |
1222 | epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL); | |
1223 | udev_monitor_unref(monitor); | |
1224 | monitor = NULL; | |
1225 | } | |
1226 | if (fd_inotify >= 0) { | |
1227 | epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL); | |
1228 | close(fd_inotify); | |
1229 | fd_inotify = -1; | |
1230 | } | |
1231 | ||
1232 | /* discard queued events and kill workers */ | |
1233 | event_queue_cleanup(udev, EVENT_QUEUED); | |
194bbe33 | 1234 | worker_kill(udev); |
912541b0 KS |
1235 | |
1236 | /* exit after all has cleaned up */ | |
1237 | if (udev_list_node_is_empty(&event_list) && udev_list_node_is_empty(&worker_list)) | |
1238 | break; | |
1239 | ||
1240 | /* timeout at exit for workers to finish */ | |
e64fae55 | 1241 | timeout = 30 * 1000; |
194bbe33 | 1242 | } else if (udev_list_node_is_empty(&event_list) && !children) { |
e64fae55 | 1243 | /* we are idle */ |
912541b0 | 1244 | timeout = -1; |
194bbe33 KS |
1245 | |
1246 | /* cleanup possible left-over processes in our cgroup */ | |
1247 | if (udev_cgroup) | |
1248 | cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL); | |
e64fae55 KS |
1249 | } else { |
1250 | /* kill idle or hanging workers */ | |
1251 | timeout = 3 * 1000; | |
912541b0 | 1252 | } |
8fef0ff2 | 1253 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout); |
912541b0 KS |
1254 | if (fdcount < 0) |
1255 | continue; | |
1256 | ||
1257 | if (fdcount == 0) { | |
e64fae55 KS |
1258 | struct udev_list_node *loop; |
1259 | ||
1260 | /* timeout */ | |
912541b0 | 1261 | if (udev_exit) { |
baa30fbc | 1262 | log_error("timeout, giving up waiting for workers to finish\n"); |
912541b0 KS |
1263 | break; |
1264 | } | |
1265 | ||
e64fae55 KS |
1266 | /* kill idle workers */ |
1267 | if (udev_list_node_is_empty(&event_list)) { | |
baa30fbc | 1268 | log_debug("cleanup idle workers\n"); |
194bbe33 | 1269 | worker_kill(udev); |
e64fae55 KS |
1270 | } |
1271 | ||
1272 | /* check for hanging events */ | |
1273 | udev_list_node_foreach(loop, &worker_list) { | |
1274 | struct worker *worker = node_to_worker(loop); | |
1275 | ||
1276 | if (worker->state != WORKER_RUNNING) | |
1277 | continue; | |
1278 | ||
40fe8b11 | 1279 | if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > 30 * 1000 * 1000) { |
04a9d3a0 | 1280 | log_error("worker [%u] %s timeout; kill it\n", worker->pid, |
e64fae55 KS |
1281 | worker->event ? worker->event->devpath : "<idle>"); |
1282 | kill(worker->pid, SIGKILL); | |
1283 | worker->state = WORKER_KILLED; | |
1284 | /* drop reference taken for state 'running' */ | |
1285 | worker_unref(worker); | |
1286 | if (worker->event) { | |
baa30fbc KS |
1287 | log_error("seq %llu '%s' killed\n", |
1288 | udev_device_get_seqnum(worker->event->dev), worker->event->devpath); | |
e64fae55 KS |
1289 | worker->event->exitcode = -64; |
1290 | event_queue_delete(worker->event, true); | |
1291 | worker->event = NULL; | |
1292 | } | |
1293 | } | |
1294 | } | |
1295 | ||
912541b0 KS |
1296 | } |
1297 | ||
1298 | is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false; | |
1299 | for (i = 0; i < fdcount; i++) { | |
1300 | if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN) | |
1301 | is_worker = true; | |
1302 | else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN) | |
1303 | is_netlink = true; | |
1304 | else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) | |
1305 | is_signal = true; | |
1306 | else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN) | |
1307 | is_inotify = true; | |
1308 | else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN) | |
1309 | is_ctrl = true; | |
1310 | } | |
1311 | ||
1312 | /* check for changed config, every 3 seconds at most */ | |
40fe8b11 | 1313 | if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * 1000 * 1000) { |
6ada823a | 1314 | if (udev_rules_check_timestamp(rules)) |
912541b0 KS |
1315 | reload = true; |
1316 | if (udev_builtin_validate(udev)) | |
1317 | reload = true; | |
1318 | ||
40fe8b11 | 1319 | last_usec = now(CLOCK_MONOTONIC); |
912541b0 KS |
1320 | } |
1321 | ||
1322 | /* reload requested, HUP signal received, rules changed, builtin changed */ | |
1323 | if (reload) { | |
194bbe33 | 1324 | worker_kill(udev); |
912541b0 KS |
1325 | rules = udev_rules_unref(rules); |
1326 | udev_builtin_exit(udev); | |
7781e063 | 1327 | reload = false; |
912541b0 KS |
1328 | } |
1329 | ||
1330 | /* event has finished */ | |
1331 | if (is_worker) | |
1332 | worker_returned(fd_worker); | |
1333 | ||
1334 | if (is_netlink) { | |
1335 | struct udev_device *dev; | |
1336 | ||
1337 | dev = udev_monitor_receive_device(monitor); | |
1338 | if (dev != NULL) { | |
40fe8b11 | 1339 | udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC)); |
912541b0 KS |
1340 | if (event_queue_insert(dev) < 0) |
1341 | udev_device_unref(dev); | |
1342 | } | |
1343 | } | |
1344 | ||
1345 | /* start new events */ | |
1346 | if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) { | |
7781e063 | 1347 | udev_builtin_init(udev); |
912541b0 KS |
1348 | if (rules == NULL) |
1349 | rules = udev_rules_new(udev, resolve_names); | |
1350 | if (rules != NULL) | |
1351 | event_queue_start(udev); | |
1352 | } | |
1353 | ||
1354 | if (is_signal) { | |
1355 | struct signalfd_siginfo fdsi; | |
1356 | ssize_t size; | |
1357 | ||
1358 | size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
1359 | if (size == sizeof(struct signalfd_siginfo)) | |
1360 | handle_signal(udev, fdsi.ssi_signo); | |
1361 | } | |
1362 | ||
1363 | /* we are shutting down, the events below are not handled anymore */ | |
1364 | if (udev_exit) | |
1365 | continue; | |
1366 | ||
1367 | /* device node watch */ | |
1368 | if (is_inotify) | |
1369 | handle_inotify(udev); | |
1370 | ||
1371 | /* | |
1372 | * This needs to be after the inotify handling, to make sure, | |
1373 | * that the ping is send back after the possibly generated | |
1374 | * "change" events by the inotify device node watch. | |
1375 | * | |
1376 | * A single time we may receive a client connection which we need to | |
1377 | * keep open to block the client. It will be closed right before we | |
1378 | * exit. | |
1379 | */ | |
1380 | if (is_ctrl) | |
1381 | ctrl_conn = handle_ctrl_msg(udev_ctrl); | |
1382 | } | |
1383 | ||
1384 | rc = EXIT_SUCCESS; | |
53921bfa | 1385 | exit: |
912541b0 KS |
1386 | udev_queue_export_cleanup(udev_queue_export); |
1387 | udev_ctrl_cleanup(udev_ctrl); | |
1f5a5100 | 1388 | exit_daemonize: |
912541b0 KS |
1389 | if (fd_ep >= 0) |
1390 | close(fd_ep); | |
1391 | worker_list_cleanup(udev); | |
1392 | event_queue_cleanup(udev, EVENT_UNDEF); | |
1393 | udev_rules_unref(rules); | |
1394 | udev_builtin_exit(udev); | |
1395 | if (fd_signal >= 0) | |
1396 | close(fd_signal); | |
1397 | if (worker_watch[READ_END] >= 0) | |
1398 | close(worker_watch[READ_END]); | |
1399 | if (worker_watch[WRITE_END] >= 0) | |
1400 | close(worker_watch[WRITE_END]); | |
1401 | udev_monitor_unref(monitor); | |
1402 | udev_queue_export_unref(udev_queue_export); | |
1403 | udev_ctrl_connection_unref(ctrl_conn); | |
1404 | udev_ctrl_unref(udev_ctrl); | |
e9a5ef7c | 1405 | label_finish(); |
912541b0 | 1406 | udev_unref(udev); |
baa30fbc | 1407 | log_close(); |
912541b0 | 1408 | return rc; |
7fafc032 | 1409 | } |