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 int adm_settle(struct udev
*udev
, int argc
, char *argv
[])
42 static const struct option options
[] = {
43 { "seq-start", required_argument
, NULL
, 's' },
44 { "seq-end", required_argument
, NULL
, 'e' },
45 { "timeout", required_argument
, NULL
, 't' },
46 { "exit-if-exists", required_argument
, NULL
, 'E' },
47 { "quiet", no_argument
, NULL
, 'q' },
48 { "help", no_argument
, NULL
, 'h' },
51 usec_t start_usec
= now(CLOCK_MONOTONIC
);
55 const char *exists
= NULL
;
56 unsigned int timeout
= 120;
57 struct pollfd pfd
[1] = { {.fd
= -1}, };
58 struct udev_queue
*udev_queue
= NULL
;
59 int rc
= EXIT_FAILURE
;
64 option
= getopt_long(argc
, argv
, "s:e:t:E:qh", options
, NULL
);
67 fprintf(stderr
, "Extraneous argument: '%s'\n", argv
[optind
]);
75 start
= strtoull(optarg
, NULL
, 0);
78 end
= strtoull(optarg
, NULL
, 0);
83 r
= safe_atou(optarg
, &timeout
);
85 fprintf(stderr
, "Invalid timeout value '%s': %s\n",
86 optarg
, strerror(-r
));
97 printf("Usage: udevadm settle OPTIONS\n"
98 " --timeout=<seconds> maximum time to wait for events\n"
99 " --seq-start=<seqnum> first seqnum to wait for\n"
100 " --seq-end=<seqnum> last seqnum to wait for\n"
101 " --exit-if-exists=<file> stop waiting if file exists\n"
102 " --quiet do not print list after timeout\n"
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",