/* * 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 <getopt.h> #include <poll.h> #include "udev.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" " --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' }, { "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:hs:e:q", 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(); 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", };