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/*
* Copyright (C) 2006-2009 Kay Sievers <kay@vrfy.org>
* Copyright (C) 2009 Canonical Ltd.
* Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <syslog.h>
#include <getopt.h>
#include <signal.h>
#include <time.h>
#include <sys/inotify.h>
#include <sys/poll.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "udev.h"
#include "udev-util.h"
#include "util.h"
static void help(void) {
printf("Usage: udevadm settle OPTIONS\n"
" -t,--timeout=<seconds> maximum time to wait for events\n"
" -E,--exit-if-exists=<file> stop waiting if file exists\n"
" -h,--help\n\n");
}
static int adm_settle(struct udev *udev, int argc, char *argv[])
{
static const struct option options[] = {
{ "seq-start", required_argument, NULL, '\0' }, /* removed */
{ "seq-end", required_argument, NULL, '\0' }, /* removed */
{ "timeout", required_argument, NULL, 't' },
{ "exit-if-exists", required_argument, NULL, 'E' },
{ "quiet", no_argument, NULL, 'q' }, /* removed */
{ "help", no_argument, NULL, 'h' },
{}
};
const char *exists = NULL;
unsigned int timeout = 120;
struct pollfd pfd[1] = { {.fd = -1}, };
int rc = EXIT_FAILURE, c;
while ((c = getopt_long(argc, argv, "s:e:t:E:qh", options, NULL)) >= 0) {
switch (c) {
case 't': {
int r;
r = safe_atou(optarg, &timeout);
if (r < 0) {
fprintf(stderr, "Invalid timeout value '%s': %s\n",
optarg, strerror(-r));
exit(EXIT_FAILURE);
};
break;
}
case 'E':
exists = optarg;
break;
case 'h':
help();
exit(EXIT_SUCCESS);
case '?':
exit(EXIT_FAILURE);
default:
assert_not_reached("Unknown argument");
}
}
if (optind < argc) {
fprintf(stderr, "Extraneous argument: '%s'\n", argv[optind]);
exit(EXIT_FAILURE);
}
/* guarantee that the udev daemon isn't pre-processing */
if (getuid() == 0) {
struct udev_ctrl *uctrl;
uctrl = udev_ctrl_new(udev);
if (uctrl != NULL) {
if (udev_ctrl_send_ping(uctrl, timeout) < 0) {
log_debug("no connection to daemon");
udev_ctrl_unref(uctrl);
rc = EXIT_SUCCESS;
goto out;
}
udev_ctrl_unref(uctrl);
}
}
pfd[0].events = POLLIN;
pfd[0].fd = inotify_init1(IN_CLOEXEC);
if (pfd[0].fd < 0) {
log_error("inotify_init failed: %m");
goto out;
}
if (inotify_add_watch(pfd[0].fd, "/run/udev/queue" , IN_DELETE) < 0) {
/* If it does not exist, we don't have to wait */
if (errno == ENOENT)
rc = EXIT_SUCCESS;
else
log_debug("watching /run/udev/queue failed");
goto out;
}
for (;;) {
if (exists && access(exists, F_OK) >= 0) {
rc = EXIT_SUCCESS;
break;
}
/* exit if queue is empty */
if (access("/run/udev/queue", F_OK) < 0) {
rc = EXIT_SUCCESS;
break;
}
/* wake up when "queue" file is deleted */
if (poll(pfd, 1, 100) > 0 && pfd[0].revents & POLLIN) {
char buf[sizeof(struct inotify_event) + PATH_MAX];
read(pfd[0].fd, buf, sizeof(buf));
}
}
out:
if (pfd[0].fd >= 0)
close(pfd[0].fd);
return rc;
}
const struct udevadm_cmd udevadm_settle = {
.name = "settle",
.cmd = adm_settle,
.help = "wait for pending udev events",
};
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