mirror of
https://github.com/systemd/systemd.git
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226 lines
5.7 KiB
C
226 lines
5.7 KiB
C
/*
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* Copyright (C) 2006-2008 Kay Sievers <kay@vrfy.org>
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* Copyright (C) 2009 Canonical Ltd.
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* Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <syslog.h>
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#include <getopt.h>
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#include <signal.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "udev.h"
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#define DEFAULT_TIMEOUT 180
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#define LOOP_PER_SECOND 20
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static volatile sig_atomic_t is_timeout;
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static void sig_handler(int signum)
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{
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switch (signum) {
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case SIGALRM:
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is_timeout = 1;
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case SIGUSR1:
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;
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}
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}
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int udevadm_settle(struct udev *udev, int argc, char *argv[])
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{
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static const struct option options[] = {
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{ "seq-start", required_argument, NULL, 's' },
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{ "seq-end", required_argument, NULL, 'e' },
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{ "timeout", required_argument, NULL, 't' },
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{ "exit-if-exists", required_argument, NULL, 'E' },
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{ "quiet", no_argument, NULL, 'q' },
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{ "help", no_argument, NULL, 'h' },
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{}
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};
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unsigned long long start = 0;
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unsigned long long end = 0;
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int quiet = 0;
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const char *exists = NULL;
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int timeout = DEFAULT_TIMEOUT;
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struct sigaction act;
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struct udev_queue *udev_queue = NULL;
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int rc = 1;
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dbg(udev, "version %s\n", VERSION);
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/* set signal handlers */
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memset(&act, 0x00, sizeof(act));
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act.sa_handler = sig_handler;
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sigemptyset (&act.sa_mask);
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act.sa_flags = 0;
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sigaction(SIGALRM, &act, NULL);
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sigaction(SIGUSR1, &act, NULL);
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while (1) {
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int option;
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int seconds;
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option = getopt_long(argc, argv, "s:e:t:E:qh", options, NULL);
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if (option == -1)
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break;
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switch (option) {
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case 's':
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start = strtoull(optarg, NULL, 0);
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break;
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case 'e':
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end = strtoull(optarg, NULL, 0);
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break;
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case 't':
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seconds = atoi(optarg);
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if (seconds >= 0)
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timeout = seconds;
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else
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fprintf(stderr, "invalid timeout value\n");
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dbg(udev, "timeout=%i\n", timeout);
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break;
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case 'q':
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quiet = 1;
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break;
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case 'E':
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exists = optarg;
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break;
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case 'h':
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printf("Usage: udevadm settle OPTIONS\n"
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" --timeout=<seconds> maximum time to wait for events\n"
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" --seq-start=<seqnum> first seqnum to wait for\n"
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" --seq-end=<seqnum> last seqnum to wait for\n"
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" --exit-if-exists=<file> stop waiting if file exists\n"
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" --quiet do not print list after timeout\n"
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" --help\n\n");
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exit(0);
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}
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}
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if (timeout > 0)
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alarm(timeout);
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else
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is_timeout = 1;
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udev_queue = udev_queue_new(udev);
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if (udev_queue == NULL)
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exit(2);
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if (start > 0) {
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unsigned long long kernel_seq;
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kernel_seq = udev_queue_get_kernel_seqnum(udev_queue);
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/* unless specified, the last event is the current kernel seqnum */
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if (end == 0)
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end = udev_queue_get_kernel_seqnum(udev_queue);
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if (start > end) {
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err(udev, "seq-start larger than seq-end, ignoring\n");
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fprintf(stderr, "seq-start larger than seq-end, ignoring\n");
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start = 0;
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end = 0;
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}
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if (start > kernel_seq || end > kernel_seq) {
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err(udev, "seq-start or seq-end larger than current kernel value, ignoring\n");
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fprintf(stderr, "seq-start or seq-end larger than current kernel value, ignoring\n");
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start = 0;
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end = 0;
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}
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info(udev, "start=%llu end=%llu current=%llu\n", start, end, kernel_seq);
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} else {
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if (end > 0) {
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err(udev, "seq-end needs seq-start parameter, ignoring\n");
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fprintf(stderr, "seq-end needs seq-start parameter, ignoring\n");
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end = 0;
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}
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}
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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_from_socket(udev, UDEV_CTRL_SOCK_PATH);
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if (uctrl != NULL) {
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sigset_t mask, oldmask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGUSR1);
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sigaddset(&mask, SIGALRM);
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sigprocmask(SIG_BLOCK, &mask, &oldmask);
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if (udev_ctrl_send_settle(uctrl) > 0)
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sigsuspend(&oldmask);
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sigprocmask(SIG_SETMASK, &oldmask, NULL);
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udev_ctrl_unref(uctrl);
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}
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}
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while (1) {
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struct stat statbuf;
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if (exists != NULL && stat(exists, &statbuf) == 0) {
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rc = 0;
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break;
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}
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if (start > 0) {
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/* if asked for, wait for a specific sequence of events */
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if (udev_queue_get_seqnum_sequence_is_finished(udev_queue, start, end) == 1) {
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rc = 0;
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break;
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}
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} else {
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/* exit if queue is empty */
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if (udev_queue_get_queue_is_empty(udev_queue)) {
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rc = 0;
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break;
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}
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}
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if (is_timeout)
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break;
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usleep(1000 * 1000 / LOOP_PER_SECOND);
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}
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/* if we reached the timeout, print the list of remaining events */
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if (is_timeout) {
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struct udev_list_entry *list_entry;
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if (!quiet && udev_queue_get_queued_list_entry(udev_queue) != NULL) {
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info(udev, "timeout waiting for udev queue\n");
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printf("\nudevadm settle - timeout of %i seconds reached, the event queue contains:\n", timeout);
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udev_list_entry_foreach(list_entry, udev_queue_get_queued_list_entry(udev_queue))
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printf(" %s (%s)\n",
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udev_list_entry_get_name(list_entry),
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udev_list_entry_get_value(list_entry));
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}
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}
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udev_queue_unref(udev_queue);
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return rc;
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}
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