/* * 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 <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" " -s,--seq-start=<seqnum> first seqnum to wait for\n" " -e,--seq-end=<seqnum> last seqnum to wait for\n" " -E,--exit-if-exists=<file> stop waiting if file exists\n" " -q,--quiet do not print list after timeout\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, 's' }, { "seq-end", required_argument, NULL, 'e' }, { "timeout", required_argument, NULL, 't' }, { "exit-if-exists", required_argument, NULL, 'E' }, { "quiet", no_argument, NULL, 'q' }, { "help", no_argument, NULL, 'h' }, {} }; usec_t start_usec = now(CLOCK_MONOTONIC); usec_t start = 0; usec_t end = 0; int quiet = 0; const char *exists = NULL; unsigned int timeout = 120; struct pollfd pfd[1] = { {.fd = -1}, }; _cleanup_udev_queue_unref_ struct udev_queue *udev_queue = NULL; int rc = EXIT_FAILURE, c; while ((c = getopt_long(argc, argv, "s:e:t:E:qh", options, NULL)) >= 0) switch (c) { case 's': start = strtoull(optarg, NULL, 0); break; case 'e': end = strtoull(optarg, NULL, 0); break; 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 'q': quiet = 1; break; case 'h': help(); exit(EXIT_SUCCESS); case '?': exit(EXIT_FAILURE); default: assert_not_reached("Unkown argument"); } if (optind < argc) { fprintf(stderr, "Extraneous argument: '%s'\n", argv[optind]); exit(EXIT_FAILURE); } udev_queue = udev_queue_new(udev); if (udev_queue == NULL) exit(2); if (start > 0) { unsigned long long kernel_seq; kernel_seq = udev_queue_get_kernel_seqnum(udev_queue); /* unless specified, the last event is the current kernel seqnum */ if (end == 0) end = udev_queue_get_kernel_seqnum(udev_queue); if (start > end) { log_error("seq-start larger than seq-end, ignoring"); start = 0; end = 0; } if (start > kernel_seq || end > kernel_seq) { log_error("seq-start or seq-end larger than current kernel value, ignoring"); start = 0; end = 0; } log_debug("start=%llu end=%llu current=%llu", (unsigned long long)start, (unsigned long long)end, kernel_seq); } else { if (end > 0) { log_error("seq-end needs seq-start parameter, ignoring"); end = 0; } } /* 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"); } else { if (inotify_add_watch(pfd[0].fd, "/run/udev" , IN_MOVED_TO) < 0) { log_error("watching /run/udev failed"); close(pfd[0].fd); pfd[0].fd = -1; } } for (;;) { struct stat statbuf; if (exists != NULL && stat(exists, &statbuf) == 0) { rc = EXIT_SUCCESS; break; } if (start > 0) { /* if asked for, wait for a specific sequence of events */ if (udev_queue_get_seqnum_sequence_is_finished(udev_queue, start, end) == 1) { rc = EXIT_SUCCESS; break; } } else { /* exit if queue is empty */ if (udev_queue_get_queue_is_empty(udev_queue)) { rc = EXIT_SUCCESS; break; } } if (pfd[0].fd >= 0) { int delay; if (exists != NULL || start > 0) delay = 100; else delay = 1000; /* wake up after delay, or immediately after the queue is rebuilt */ if (poll(pfd, 1, delay) > 0 && pfd[0].revents & POLLIN) { char buf[sizeof(struct inotify_event) + PATH_MAX]; read(pfd[0].fd, buf, sizeof(buf)); } } else { sleep(1); } if (timeout > 0) { usec_t age_usec; age_usec = now(CLOCK_MONOTONIC) - start_usec; if (age_usec / (1000 * 1000) >= timeout) { struct udev_list_entry *list_entry; if (!quiet && udev_queue_get_queued_list_entry(udev_queue) != NULL) { log_debug("timeout waiting for udev queue"); printf("\nudevadm settle - timeout of %i seconds reached, the event queue contains:\n", timeout); udev_list_entry_foreach(list_entry, udev_queue_get_queued_list_entry(udev_queue)) printf(" %s (%s)\n", udev_list_entry_get_name(list_entry), udev_list_entry_get_value(list_entry)); } break; } } } 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 the event queue to finish", };