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/>.
34 #include <sys/types.h>
37 #include "udev-util.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 " -E,--exit-if-exists=<file> stop waiting if file exists\n"
47 static int adm_settle(struct udev *udev, int argc, char *argv[])
49 static const struct option options[] = {
50 { "seq-start", required_argument, NULL, '\0' }, /* removed */
51 { "seq-end", required_argument, NULL, '\0' }, /* removed */
52 { "timeout", required_argument, NULL, 't' },
53 { "exit-if-exists", required_argument, NULL, 'E' },
54 { "quiet", no_argument, NULL, 'q' }, /* removed */
55 { "help", no_argument, NULL, 'h' },
58 const char *exists = NULL;
59 unsigned int timeout = 120;
60 struct pollfd pfd[1] = { {.fd = -1}, };
62 struct udev_queue *queue;
63 int rc = EXIT_FAILURE;
65 while ((c = getopt_long(argc, argv, "s:e:t:E:qh", options, NULL)) >= 0) {
70 r = safe_atou(optarg, &timeout);
72 fprintf(stderr, "Invalid timeout value '%s': %s\n",
73 optarg, strerror(-r));
87 assert_not_reached("Unknown argument");
92 fprintf(stderr, "Extraneous argument: '%s'\n", argv[optind]);
96 /* guarantee that the udev daemon isn't pre-processing */
98 struct udev_ctrl *uctrl;
100 uctrl = udev_ctrl_new(udev);
102 if (udev_ctrl_send_ping(uctrl, timeout) < 0) {
103 log_debug("no connection to daemon");
104 udev_ctrl_unref(uctrl);
107 udev_ctrl_unref(uctrl);
111 queue = udev_queue_new(udev);
113 log_error("unable to get udev queue");
117 pfd[0].events = POLLIN;
118 pfd[0].fd = udev_queue_get_fd(queue);
120 log_debug("queue is empty, nothing to watch");
126 if (exists && access(exists, F_OK) >= 0) {
131 /* exit if queue is empty */
132 if (udev_queue_get_queue_is_empty(queue)) {
137 /* wake up when queue is empty */
138 if (poll(pfd, 1, MSEC_PER_SEC) > 0 && pfd[0].revents & POLLIN)
139 udev_queue_flush(queue);
143 udev_queue_unref(queue);
147 const struct udevadm_cmd udevadm_settle = {
150 .help = "wait for pending udev events",