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-rw-r--r--src/udev/udevadm-settle.c235
1 files changed, 235 insertions, 0 deletions
diff --git a/src/udev/udevadm-settle.c b/src/udev/udevadm-settle.c
new file mode 100644
index 0000000000..b168defd90
--- /dev/null
+++ b/src/udev/udevadm-settle.c
@@ -0,0 +1,235 @@
+/*
+ * 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 <sys/poll.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "udev.h"
+
+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' },
+ {}
+ };
+ unsigned long long start_usec = now_usec();
+ unsigned long long start = 0;
+ unsigned long long end = 0;
+ int quiet = 0;
+ const char *exists = NULL;
+ unsigned int timeout = 120;
+ struct pollfd pfd[1];
+ struct udev_queue *udev_queue = NULL;
+ int rc = EXIT_FAILURE;
+
+ dbg(udev, "version %s\n", VERSION);
+
+ for (;;) {
+ int option;
+ int seconds;
+
+ option = getopt_long(argc, argv, "s:e:t:E:qh", options, NULL);
+ if (option == -1)
+ break;
+
+ switch (option) {
+ case 's':
+ start = strtoull(optarg, NULL, 0);
+ break;
+ case 'e':
+ end = strtoull(optarg, NULL, 0);
+ break;
+ case 't':
+ seconds = atoi(optarg);
+ if (seconds >= 0)
+ timeout = seconds;
+ else
+ fprintf(stderr, "invalid timeout value\n");
+ dbg(udev, "timeout=%i\n", timeout);
+ break;
+ case 'q':
+ quiet = 1;
+ break;
+ case 'E':
+ exists = optarg;
+ break;
+ case 'h':
+ printf("Usage: udevadm settle OPTIONS\n"
+ " --timeout=<seconds> maximum time to wait for events\n"
+ " --seq-start=<seqnum> first seqnum to wait for\n"
+ " --seq-end=<seqnum> last seqnum to wait for\n"
+ " --exit-if-exists=<file> stop waiting if file exists\n"
+ " --quiet do not print list after timeout\n"
+ " --help\n\n");
+ exit(EXIT_SUCCESS);
+ default:
+ 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) {
+ err(udev, "seq-start larger than seq-end, ignoring\n");
+ start = 0;
+ end = 0;
+ }
+
+ if (start > kernel_seq || end > kernel_seq) {
+ err(udev, "seq-start or seq-end larger than current kernel value, ignoring\n");
+ start = 0;
+ end = 0;
+ }
+ info(udev, "start=%llu end=%llu current=%llu\n", start, end, kernel_seq);
+ } else {
+ if (end > 0) {
+ err(udev, "seq-end needs seq-start parameter, ignoring\n");
+ 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) {
+ info(udev, "no connection to daemon\n");
+ 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) {
+ err(udev, "inotify_init failed: %m\n");
+ } else {
+ if (inotify_add_watch(pfd[0].fd, udev_get_run_path(udev), IN_MOVED_TO) < 0) {
+ err(udev, "watching '%s' failed\n", udev_get_run_path(udev));
+ 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) {
+ unsigned long long age_usec;
+
+ age_usec = now_usec() - 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) {
+ info(udev, "timeout waiting for udev queue\n");
+ 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);
+ udev_queue_unref(udev_queue);
+ return rc;
+}
+
+const struct udevadm_cmd udevadm_settle = {
+ .name = "settle",
+ .cmd = adm_settle,
+ .help = "wait for the event queue to finish",
+};
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