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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright © 2009 Canonical Ltd.
* Copyright © 2009 Scott James Remnant <scott@netsplit.com>
*/
#include <errno.h>
#include <getopt.h>
#include <poll.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "parse-util.h"
#include "udev.h"
#include "udevadm-util.h"
#include "util.h"
static void help(void) {
printf("%s settle [OPTIONS]\n\n"
"Wait for pending udev events.\n\n"
" -h --help Show this help\n"
" -V --version Show package version\n"
" -t --timeout=SECONDS Maximum time to wait for events\n"
" -E --exit-if-exists=FILE Stop waiting if file exists\n"
, program_invocation_short_name);
}
static int adm_settle(struct udev *udev, int argc, char *argv[]) {
static const struct option options[] = {
{ "timeout", required_argument, NULL, 't' },
{ "exit-if-exists", required_argument, NULL, 'E' },
{ "version", no_argument, NULL, 'V' },
{ "help", no_argument, NULL, 'h' },
{ "seq-start", required_argument, NULL, 's' }, /* removed */
{ "seq-end", required_argument, NULL, 'e' }, /* removed */
{ "quiet", no_argument, NULL, 'q' }, /* removed */
{}
};
usec_t deadline;
const char *exists = NULL;
unsigned int timeout = 120;
struct pollfd pfd[1] = { {.fd = -1}, };
int c;
struct udev_queue *queue;
int rc = EXIT_FAILURE;
while ((c = getopt_long(argc, argv, "t:E:Vhs:e:q", options, NULL)) >= 0) {
switch (c) {
case 't': {
int r;
r = safe_atou(optarg, &timeout);
if (r < 0) {
log_error_errno(r, "Invalid timeout value '%s': %m", optarg);
return EXIT_FAILURE;
}
break;
}
case 'E':
exists = optarg;
break;
case 'V':
print_version();
return EXIT_SUCCESS;
case 'h':
help();
return EXIT_SUCCESS;
case 's':
case 'e':
case 'q':
log_info("Option -%c no longer supported.", c);
return EXIT_FAILURE;
case '?':
return EXIT_FAILURE;
default:
assert_not_reached("Unknown argument");
}
}
if (optind < argc) {
fprintf(stderr, "Extraneous argument: '%s'\n", argv[optind]);
return EXIT_FAILURE;
}
deadline = now(CLOCK_MONOTONIC) + timeout * USEC_PER_SEC;
/* 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, MAX(5U, timeout)) < 0) {
log_debug("no connection to daemon");
udev_ctrl_unref(uctrl);
return EXIT_SUCCESS;
}
udev_ctrl_unref(uctrl);
}
}
queue = udev_queue_new(udev);
if (!queue) {
log_error("unable to get udev queue");
return EXIT_FAILURE;
}
pfd[0].events = POLLIN;
pfd[0].fd = udev_queue_get_fd(queue);
if (pfd[0].fd < 0) {
log_debug("queue is empty, nothing to watch");
rc = EXIT_SUCCESS;
goto out;
}
for (;;) {
if (exists && access(exists, F_OK) >= 0) {
rc = EXIT_SUCCESS;
break;
}
/* exit if queue is empty */
if (udev_queue_get_queue_is_empty(queue)) {
rc = EXIT_SUCCESS;
break;
}
if (now(CLOCK_MONOTONIC) >= deadline)
break;
/* wake up when queue is empty */
if (poll(pfd, 1, MSEC_PER_SEC) > 0 && pfd[0].revents & POLLIN)
udev_queue_flush(queue);
}
out:
udev_queue_unref(queue);
return rc;
}
const struct udevadm_cmd udevadm_settle = {
.name = "settle",
.cmd = adm_settle,
.help = "Wait for pending udev events",
};
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