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-rw-r--r--src/udev/udevadm-settle.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/src/udev/udevadm-settle.c b/src/udev/udevadm-settle.c
new file mode 100644
index 0000000..8d9c450
--- /dev/null
+++ b/src/udev/udevadm-settle.c
@@ -0,0 +1,146 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright © 2009 Canonical Ltd.
+ * Copyright © 2009 Scott James Remnant <scott@netsplit.com>
+ */
+
+#include <errno.h>
+#include <getopt.h>
+#include <poll.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "libudev-util.h"
+#include "time-util.h"
+#include "udevadm.h"
+#include "udev-ctrl.h"
+#include "util.h"
+#include "virt.h"
+
+static usec_t arg_timeout = 120 * USEC_PER_SEC;
+static const char *arg_exists = NULL;
+
+static int help(void) {
+ printf("%s settle [OPTIONS]\n\n"
+ "Wait for pending udev events.\n\n"
+ " -h --help Show this help\n"
+ " -V --version Show package version\n"
+ " -t --timeout=SEC Maximum time to wait for events\n"
+ " -E --exit-if-exists=FILE Stop waiting if file exists\n"
+ , program_invocation_short_name);
+
+ return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+ static const struct option options[] = {
+ { "timeout", required_argument, NULL, 't' },
+ { "exit-if-exists", required_argument, NULL, 'E' },
+ { "version", no_argument, NULL, 'V' },
+ { "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 */
+ {}
+ };
+
+ int c, r;
+
+ while ((c = getopt_long(argc, argv, "t:E:Vhs:e:q", options, NULL)) >= 0) {
+ switch (c) {
+ case 't':
+ r = parse_sec(optarg, &arg_timeout);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse timeout value '%s': %m", optarg);
+ break;
+ case 'E':
+ arg_exists = optarg;
+ break;
+ case 'V':
+ return print_version();
+ case 'h':
+ return help();
+ case 's':
+ case 'e':
+ case 'q':
+ return log_info_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Option -%c no longer supported.",
+ c);
+ case '?':
+ return -EINVAL;
+ default:
+ assert_not_reached("Unknown option.");
+ }
+ }
+
+ return 1;
+}
+
+int settle_main(int argc, char *argv[], void *userdata) {
+ _cleanup_(udev_queue_unrefp) struct udev_queue *queue = NULL;
+ struct pollfd pfd;
+ usec_t deadline;
+ int r;
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ return r;
+
+ if (running_in_chroot() > 0) {
+ log_info("Running in chroot, ignoring request.");
+ return 0;
+ }
+
+ deadline = now(CLOCK_MONOTONIC) + arg_timeout;
+
+ /* guarantee that the udev daemon isn't pre-processing */
+ if (getuid() == 0) {
+ _cleanup_(udev_ctrl_unrefp) struct udev_ctrl *uctrl = NULL;
+
+ uctrl = udev_ctrl_new();
+ if (uctrl) {
+ r = udev_ctrl_send_ping(uctrl, MAX(5 * USEC_PER_SEC, arg_timeout));
+ if (r < 0) {
+ log_debug_errno(r, "Failed to connect to udev daemon: %m");
+ return 0;
+ }
+ }
+ }
+
+ queue = udev_queue_new(NULL);
+ if (!queue)
+ return log_error_errno(errno, "Failed to get udev queue: %m");
+
+ r = udev_queue_get_fd(queue);
+ if (r < 0) {
+ log_debug_errno(r, "Queue is empty, nothing to watch.");
+ return 0;
+ }
+
+ pfd = (struct pollfd) {
+ .events = POLLIN,
+ .fd = r,
+ };
+
+ for (;;) {
+ if (arg_exists && access(arg_exists, F_OK) >= 0)
+ return 0;
+
+ /* exit if queue is empty */
+ if (udev_queue_get_queue_is_empty(queue))
+ return 0;
+
+ if (now(CLOCK_MONOTONIC) >= deadline)
+ return -ETIMEDOUT;
+
+ /* wake up when queue becomes empty */
+ if (poll(&pfd, 1, MSEC_PER_SEC) > 0 && pfd.revents & POLLIN) {
+ r = udev_queue_flush(queue);
+ if (r < 0)
+ return log_error_errno(r, "Failed to flush queue: %m");
+ }
+ }
+}