2 * Copyright (C) 2006-2008 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/types.h>
36 #define DEFAULT_TIMEOUT 180
37 #define LOOP_PER_SECOND 20
39 static volatile sig_atomic_t is_timeout;
41 static void sig_handler(int signum)
51 int udevadm_settle(struct udev *udev, int argc, char *argv[])
53 static const struct option options[] = {
54 { "seq-start", required_argument, NULL, 's' },
55 { "seq-end", required_argument, NULL, 'e' },
56 { "timeout", required_argument, NULL, 't' },
57 { "exit-if-exists", required_argument, NULL, 'E' },
58 { "quiet", no_argument, NULL, 'q' },
59 { "help", no_argument, NULL, 'h' },
62 unsigned long long start = 0;
63 unsigned long long end = 0;
65 const char *exists = NULL;
66 int timeout = DEFAULT_TIMEOUT;
68 struct udev_queue *udev_queue = NULL;
71 dbg(udev, "version %s\n", VERSION);
73 /* set signal handlers */
74 memset(&act, 0x00, sizeof(act));
75 act.sa_handler = sig_handler;
76 sigemptyset (&act.sa_mask);
78 sigaction(SIGALRM, &act, NULL);
79 sigaction(SIGUSR1, &act, NULL);
85 option = getopt_long(argc, argv, "s:e:t:E:qh", options, NULL);
91 start = strtoull(optarg, NULL, 0);
94 end = strtoull(optarg, NULL, 0);
97 seconds = atoi(optarg);
101 fprintf(stderr, "invalid timeout value\n");
102 dbg(udev, "timeout=%i\n", timeout);
111 printf("Usage: udevadm settle OPTIONS\n"
112 " --timeout=<seconds> maximum time to wait for events\n"
113 " --seq-start=<seqnum> first seqnum to wait for\n"
114 " --seq-end=<seqnum> last seqnum to wait for\n"
115 " --exit-if-exists=<file> stop waiting if file exists\n"
116 " --quiet do not print list after timeout\n"
127 udev_queue = udev_queue_new(udev);
128 if (udev_queue == NULL)
132 unsigned long long kernel_seq;
134 kernel_seq = udev_queue_get_kernel_seqnum(udev_queue);
136 /* unless specified, the last event is the current kernel seqnum */
138 end = udev_queue_get_kernel_seqnum(udev_queue);
141 err(udev, "seq-start larger than seq-end, ignoring\n");
142 fprintf(stderr, "seq-start larger than seq-end, ignoring\n");
147 if (start > kernel_seq || end > kernel_seq) {
148 err(udev, "seq-start or seq-end larger than current kernel value, ignoring\n");
149 fprintf(stderr, "seq-start or seq-end larger than current kernel value, ignoring\n");
153 info(udev, "start=%llu end=%llu current=%llu\n", start, end, kernel_seq);
156 err(udev, "seq-end needs seq-start parameter, ignoring\n");
157 fprintf(stderr, "seq-end needs seq-start parameter, ignoring\n");
162 /* guarantee that the udev daemon isn't pre-processing */
164 struct udev_ctrl *uctrl;
166 uctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
168 sigset_t mask, oldmask;
171 sigaddset(&mask, SIGUSR1);
172 sigaddset(&mask, SIGALRM);
173 sigprocmask(SIG_BLOCK, &mask, &oldmask);
174 if (udev_ctrl_send_settle(uctrl) > 0)
175 sigsuspend(&oldmask);
176 sigprocmask(SIG_SETMASK, &oldmask, NULL);
177 udev_ctrl_unref(uctrl);
184 if (exists != NULL && stat(exists, &statbuf) == 0) {
190 /* if asked for, wait for a specific sequence of events */
191 if (udev_queue_get_seqnum_sequence_is_finished(udev_queue, start, end) == 1) {
196 /* exit if queue is empty */
197 if (udev_queue_get_queue_is_empty(udev_queue)) {
206 usleep(1000 * 1000 / LOOP_PER_SECOND);
209 /* if we reached the timeout, print the list of remaining events */
211 struct udev_list_entry *list_entry;
213 if (!quiet && udev_queue_get_queued_list_entry(udev_queue) != NULL) {
214 info(udev, "timeout waiting for udev queue\n");
215 printf("\nudevadm settle - timeout of %i seconds reached, the event queue contains:\n", timeout);
216 udev_list_entry_foreach(list_entry, udev_queue_get_queued_list_entry(udev_queue))
218 udev_list_entry_get_name(list_entry),
219 udev_list_entry_get_value(list_entry));
223 udev_queue_unref(udev_queue);