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