2 * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
28 #include <sys/socket.h>
30 #include <sys/select.h>
31 #include <linux/types.h>
32 #include <linux/netlink.h>
38 static void asmlinkage sig_handler(int signum)
40 if (signum == SIGINT || signum == SIGTERM)
44 static void print_device(struct udev_device *device, const char *source, int env)
49 gettimeofday(&tv, &tz);
50 printf("%-6s[%llu.%06u] %-8s %s (%s)\n",
52 (unsigned long long) tv.tv_sec, (unsigned int) tv.tv_usec,
53 udev_device_get_action(device),
54 udev_device_get_devpath(device),
55 udev_device_get_subsystem(device));
57 struct udev_list_entry *list_entry;
59 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device))
61 udev_list_entry_get_name(list_entry),
62 udev_list_entry_get_value(list_entry));
67 int udevadm_monitor(struct udev *udev, int argc, char *argv[])
74 struct udev_monitor *udev_monitor = NULL;
75 struct udev_monitor *kernel_monitor = NULL;
79 static const struct option options[] = {
80 { "environment", no_argument, NULL, 'e' },
81 { "kernel", no_argument, NULL, 'k' },
82 { "udev", no_argument, NULL, 'u' },
83 { "help", no_argument, NULL, 'h' },
88 option = getopt_long(argc, argv, "ekuh", options, NULL);
103 printf("Usage: udevadm monitor [--environment] [--kernel] [--udev] [--help]\n"
104 " --env print the whole event environment\n"
105 " --kernel print kernel uevents\n"
106 " --udev print udev events\n"
113 if (!print_kernel && !print_udev) {
118 /* set signal handlers */
119 memset(&act, 0x00, sizeof(struct sigaction));
120 act.sa_handler = (void (*)(int)) sig_handler;
121 sigemptyset(&act.sa_mask);
122 act.sa_flags = SA_RESTART;
123 sigaction(SIGINT, &act, NULL);
124 sigaction(SIGTERM, &act, NULL);
126 printf("monitor will print the received events for:\n");
128 udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
129 if (udev_monitor == NULL) {
133 if (udev_monitor_enable_receiving(udev_monitor) < 0) {
137 printf("UDEV - the event which udev sends out after rule processing\n");
140 kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
141 if (kernel_monitor == NULL) {
142 fprintf(stderr, "unable to subscribe to kernel events\n");
146 if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
150 printf("KERNEL - the kernel uevent\n");
158 if (kernel_monitor != NULL)
159 FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
160 if (udev_monitor != NULL)
161 FD_SET(udev_monitor_get_fd(udev_monitor), &readfds);
163 fdcount = select(UDEV_MAX(udev_monitor_get_fd(kernel_monitor), udev_monitor_get_fd(udev_monitor))+1,
164 &readfds, NULL, NULL, NULL);
167 fprintf(stderr, "error receiving uevent message: %m\n");
171 if ((kernel_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
172 struct udev_device *device;
174 device = udev_monitor_receive_device(kernel_monitor);
177 print_device(device, "KERNEL", env);
178 udev_device_unref(device);
181 if ((udev_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(udev_monitor), &readfds)) {
182 struct udev_device *device;
184 device = udev_monitor_receive_device(udev_monitor);
187 print_device(device, "UDEV", env);
188 udev_device_unref(device);
193 udev_monitor_unref(udev_monitor);
194 udev_monitor_unref(kernel_monitor);