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-rw-r--r--src/udev/udevadm-control.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/src/udev/udevadm-control.c b/src/udev/udevadm-control.c
new file mode 100644
index 0000000..ef23a6c
--- /dev/null
+++ b/src/udev/udevadm-control.c
@@ -0,0 +1,186 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * 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.
+ */
+
+#include <errno.h>
+#include <getopt.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "parse-util.h"
+#include "process-util.h"
+#include "syslog-util.h"
+#include "time-util.h"
+#include "udevadm.h"
+#include "udev-ctrl.h"
+#include "util.h"
+#include "virt.h"
+
+static int help(void) {
+ printf("%s control OPTION\n\n"
+ "Control the udev daemon.\n\n"
+ " -h --help Show this help\n"
+ " -V --version Show package version\n"
+ " -e --exit Instruct the daemon to cleanup and exit\n"
+ " -l --log-level=LEVEL Set the udev log level for the daemon\n"
+ " -s --stop-exec-queue Do not execute events, queue only\n"
+ " -S --start-exec-queue Execute events, flush queue\n"
+ " -R --reload Reload rules and databases\n"
+ " -p --property=KEY=VALUE Set a global property for all events\n"
+ " -m --children-max=N Maximum number of children\n"
+ " --ping Wait for udev to respond to a ping message\n"
+ " -t --timeout=SECONDS Maximum time to block for a reply\n"
+ , program_invocation_short_name);
+
+ return 0;
+}
+
+int control_main(int argc, char *argv[], void *userdata) {
+ _cleanup_(udev_ctrl_unrefp) struct udev_ctrl *uctrl = NULL;
+ usec_t timeout = 60 * USEC_PER_SEC;
+ int c, r;
+
+ enum {
+ ARG_PING = 0x100,
+ };
+
+ static const struct option options[] = {
+ { "exit", no_argument, NULL, 'e' },
+ { "log-level", required_argument, NULL, 'l' },
+ { "log-priority", required_argument, NULL, 'l' }, /* for backward compatibility */
+ { "stop-exec-queue", no_argument, NULL, 's' },
+ { "start-exec-queue", no_argument, NULL, 'S' },
+ { "reload", no_argument, NULL, 'R' },
+ { "reload-rules", no_argument, NULL, 'R' }, /* alias for -R */
+ { "property", required_argument, NULL, 'p' },
+ { "env", required_argument, NULL, 'p' }, /* alias for -p */
+ { "children-max", required_argument, NULL, 'm' },
+ { "ping", no_argument, NULL, ARG_PING },
+ { "timeout", required_argument, NULL, 't' },
+ { "version", no_argument, NULL, 'V' },
+ { "help", no_argument, NULL, 'h' },
+ {}
+ };
+
+ if (running_in_chroot() > 0) {
+ log_info("Running in chroot, ignoring request.");
+ return 0;
+ }
+
+ if (argc <= 1)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "This command expects one or more options.");
+
+ r = udev_ctrl_new(&uctrl);
+ if (r < 0)
+ return log_error_errno(r, "Failed to initialize udev control: %m");
+
+ while ((c = getopt_long(argc, argv, "el:sSRp:m:t:Vh", options, NULL)) >= 0)
+ switch (c) {
+ case 'e':
+ r = udev_ctrl_send_exit(uctrl);
+ if (r == -ENOANO)
+ log_warning("Cannot specify --exit after --exit, ignoring.");
+ else if (r < 0)
+ return log_error_errno(r, "Failed to send exit request: %m");
+ break;
+ case 'l':
+ r = log_level_from_string(optarg);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse log level '%s': %m", optarg);
+
+ r = udev_ctrl_send_set_log_level(uctrl, r);
+ if (r == -ENOANO)
+ log_warning("Cannot specify --log-level after --exit, ignoring.");
+ else if (r < 0)
+ return log_error_errno(r, "Failed to send request to set log level: %m");
+ break;
+ case 's':
+ r = udev_ctrl_send_stop_exec_queue(uctrl);
+ if (r == -ENOANO)
+ log_warning("Cannot specify --stop-exec-queue after --exit, ignoring.");
+ else if (r < 0)
+ return log_error_errno(r, "Failed to send request to stop exec queue: %m");
+ break;
+ case 'S':
+ r = udev_ctrl_send_start_exec_queue(uctrl);
+ if (r == -ENOANO)
+ log_warning("Cannot specify --start-exec-queue after --exit, ignoring.");
+ else if (r < 0)
+ return log_error_errno(r, "Failed to send request to start exec queue: %m");
+ break;
+ case 'R':
+ r = udev_ctrl_send_reload(uctrl);
+ if (r == -ENOANO)
+ log_warning("Cannot specify --reload after --exit, ignoring.");
+ else if (r < 0)
+ return log_error_errno(r, "Failed to send reload request: %m");
+ break;
+ case 'p':
+ if (!strchr(optarg, '='))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "expect <KEY>=<value> instead of '%s'", optarg);
+
+ r = udev_ctrl_send_set_env(uctrl, optarg);
+ if (r == -ENOANO)
+ log_warning("Cannot specify --property after --exit, ignoring.");
+ else if (r < 0)
+ return log_error_errno(r, "Failed to send request to update environment: %m");
+ break;
+ case 'm': {
+ unsigned i;
+
+ r = safe_atou(optarg, &i);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse maximum number of events '%s': %m", optarg);
+
+ r = udev_ctrl_send_set_children_max(uctrl, i);
+ if (r == -ENOANO)
+ log_warning("Cannot specify --children-max after --exit, ignoring.");
+ else if (r < 0)
+ return log_error_errno(r, "Failed to send request to set number of children: %m");
+ break;
+ }
+ case ARG_PING:
+ r = udev_ctrl_send_ping(uctrl);
+ if (r == -ENOANO)
+ log_error("Cannot specify --ping after --exit, ignoring.");
+ else if (r < 0)
+ return log_error_errno(r, "Failed to send a ping message: %m");
+ break;
+ case 't':
+ r = parse_sec(optarg, &timeout);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse timeout value '%s': %m", optarg);
+ break;
+ case 'V':
+ return print_version();
+ case 'h':
+ return help();
+ case '?':
+ return -EINVAL;
+ default:
+ assert_not_reached("Unknown option.");
+ }
+
+ if (optind < argc)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Extraneous argument: %s", argv[optind]);
+
+ r = udev_ctrl_wait(uctrl, timeout);
+ if (r < 0)
+ return log_error_errno(r, "Failed to wait for daemon to reply: %m");
+
+ return 0;
+}
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