146 lines
3.5 KiB
C
146 lines
3.5 KiB
C
/*
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* Copyright (C) 2006 Kay Sievers <kay@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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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 <sys/stat.h>
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#include <sys/types.h>
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#include "udev.h"
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#include "udevd.h"
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#define DEFAULT_TIMEOUT 180
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#define LOOP_PER_SECOND 20
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int udevsettle(int argc, char *argv[], char *envp[])
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{
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char queuename[PATH_SIZE];
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char filename[PATH_SIZE];
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unsigned long long seq_kernel;
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unsigned long long seq_udev;
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char seqnum[32];
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int fd;
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ssize_t len;
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int timeout = DEFAULT_TIMEOUT;
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int loop;
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static const struct option options[] = {
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{ "timeout", 1, NULL, 't' },
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{ "help", 0, NULL, 'h' },
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{}
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};
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int option;
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int rc = 1;
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int seconds;
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logging_init("udevsettle");
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udev_config_init();
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dbg("version %s", UDEV_VERSION);
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sysfs_init();
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while (1) {
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option = getopt_long(argc, argv, "t:h", 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 '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("timeout=%i", timeout);
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break;
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case 'h':
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printf("Usage: udevadm settle [--help] [--timeout=<seconds>]\n\n");
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goto exit;
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}
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}
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strlcpy(queuename, udev_root, sizeof(queuename));
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strlcat(queuename, "/" EVENT_QUEUE_DIR, sizeof(queuename));
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loop = timeout * LOOP_PER_SECOND;
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while (loop--) {
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/* wait for events in queue to finish */
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while (loop--) {
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struct stat statbuf;
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if (stat(queuename, &statbuf) < 0) {
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info("queue is empty");
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break;
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}
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usleep(1000 * 1000 / LOOP_PER_SECOND);
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}
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if (loop <= 0) {
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info("timeout waiting for queue");
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goto exit;
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}
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/* read current udev seqnum */
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strlcpy(filename, udev_root, sizeof(filename));
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strlcat(filename, "/" EVENT_SEQNUM, sizeof(filename));
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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goto exit;
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len = read(fd, seqnum, sizeof(seqnum)-1);
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close(fd);
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if (len <= 0)
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goto exit;
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seqnum[len] = '\0';
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seq_udev = strtoull(seqnum, NULL, 10);
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info("udev seqnum = %llu", seq_udev);
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/* read current kernel seqnum */
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strlcpy(filename, sysfs_path, sizeof(filename));
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strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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goto exit;
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len = read(fd, seqnum, sizeof(seqnum)-1);
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close(fd);
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if (len <= 0)
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goto exit;
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seqnum[len] = '\0';
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seq_kernel = strtoull(seqnum, NULL, 10);
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info("kernel seqnum = %llu", seq_kernel);
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/* make sure all kernel events have arrived in the queue */
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if (seq_udev >= seq_kernel) {
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info("queue is empty and no pending events left");
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rc = 0;
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goto exit;
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}
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usleep(1000 * 1000 / LOOP_PER_SECOND);
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info("queue is empty, but events still pending");
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}
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exit:
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sysfs_cleanup();
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logging_close();
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return rc;
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}
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