2 * Copyright (C) 2006-2009 Kay Sievers <kay@vrfy.org>
3 * Copyright (C) 2009 Canonical Ltd.
4 * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
32 #include <sys/inotify.h>
35 #include <sys/types.h>
40 static void help(void) {
41 printf("Usage: udevadm settle OPTIONS\n"
42 " -t,--timeout=<seconds> maximum time to wait for events\n"
43 " -s,--seq-start=<seqnum> first seqnum to wait for\n"
44 " -e,--seq-end=<seqnum> last seqnum to wait for\n"
45 " -E,--exit-if-exists=<file> stop waiting if file exists\n"
46 " -q,--quiet do not print list after timeout\n"
50 static int adm_settle(struct udev *udev, int argc, char *argv[])
52 static const struct option options[] = {
53 { "seq-start", required_argument, NULL, 's' },
54 { "seq-end", required_argument, NULL, 'e' },
55 { "timeout", required_argument, NULL, 't' },
56 { "exit-if-exists", required_argument, NULL, 'E' },
57 { "quiet", no_argument, NULL, 'q' },
58 { "help", no_argument, NULL, 'h' },
61 usec_t start_usec = now(CLOCK_MONOTONIC);
65 const char *exists = NULL;
66 unsigned int timeout = 120;
67 struct pollfd pfd[1] = { {.fd = -1}, };
68 struct udev_queue *udev_queue = NULL;
69 int rc = EXIT_FAILURE, c;
71 while ((c = getopt_long(argc, argv, "s:e:t:E:qh", options, NULL)) >= 0)
74 start = strtoull(optarg, NULL, 0);
77 end = strtoull(optarg, NULL, 0);
82 r = safe_atou(optarg, &timeout);
84 fprintf(stderr, "Invalid timeout value '%s': %s\n",
85 optarg, strerror(-r));
102 assert_not_reached("Unkown argument");
106 fprintf(stderr, "Extraneous argument: '%s'\n", argv[optind]);
110 udev_queue = udev_queue_new(udev);
111 if (udev_queue == NULL)
115 unsigned long long kernel_seq;
117 kernel_seq = udev_queue_get_kernel_seqnum(udev_queue);
119 /* unless specified, the last event is the current kernel seqnum */
121 end = udev_queue_get_kernel_seqnum(udev_queue);
124 log_error("seq-start larger than seq-end, ignoring\n");
129 if (start > kernel_seq || end > kernel_seq) {
130 log_error("seq-start or seq-end larger than current kernel value, ignoring\n");
134 log_debug("start=%llu end=%llu current=%llu\n", (unsigned long long)start, (unsigned long long)end, kernel_seq);
137 log_error("seq-end needs seq-start parameter, ignoring\n");
142 /* guarantee that the udev daemon isn't pre-processing */
144 struct udev_ctrl *uctrl;
146 uctrl = udev_ctrl_new(udev);
148 if (udev_ctrl_send_ping(uctrl, timeout) < 0) {
149 log_debug("no connection to daemon\n");
150 udev_ctrl_unref(uctrl);
154 udev_ctrl_unref(uctrl);
158 pfd[0].events = POLLIN;
159 pfd[0].fd = inotify_init1(IN_CLOEXEC);
161 log_error("inotify_init failed: %m\n");
163 if (inotify_add_watch(pfd[0].fd, "/run/udev" , IN_MOVED_TO) < 0) {
164 log_error("watching /run/udev failed\n");
173 if (exists != NULL && stat(exists, &statbuf) == 0) {
179 /* if asked for, wait for a specific sequence of events */
180 if (udev_queue_get_seqnum_sequence_is_finished(udev_queue, start, end) == 1) {
185 /* exit if queue is empty */
186 if (udev_queue_get_queue_is_empty(udev_queue)) {
192 if (pfd[0].fd >= 0) {
195 if (exists != NULL || start > 0)
199 /* wake up after delay, or immediately after the queue is rebuilt */
200 if (poll(pfd, 1, delay) > 0 && pfd[0].revents & POLLIN) {
201 char buf[sizeof(struct inotify_event) + PATH_MAX];
203 read(pfd[0].fd, buf, sizeof(buf));
212 age_usec = now(CLOCK_MONOTONIC) - start_usec;
213 if (age_usec / (1000 * 1000) >= timeout) {
214 struct udev_list_entry *list_entry;
216 if (!quiet && udev_queue_get_queued_list_entry(udev_queue) != NULL) {
217 log_debug("timeout waiting for udev queue\n");
218 printf("\nudevadm settle - timeout of %i seconds reached, the event queue contains:\n", timeout);
219 udev_list_entry_foreach(list_entry, udev_queue_get_queued_list_entry(udev_queue))
221 udev_list_entry_get_name(list_entry),
222 udev_list_entry_get_value(list_entry));
232 udev_queue_unref(udev_queue);
236 const struct udevadm_cmd udevadm_settle = {
239 .help = "wait for the event queue to finish",