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", 0, NULL, 'e' },
81 { "kernel", 0, NULL, 'k' },
82 { "udev", 0, NULL, 'u' },
83 { "help", 0, 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"
107 " --help print this help text\n\n");
113 if (!print_kernel && !print_udev) {
118 if (getuid() != 0 && print_kernel) {
119 fprintf(stderr, "root privileges needed to subscribe to kernel events\n");
123 /* set signal handlers */
124 memset(&act, 0x00, sizeof(struct sigaction));
125 act.sa_handler = (void (*)(int)) sig_handler;
126 sigemptyset(&act.sa_mask);
127 act.sa_flags = SA_RESTART;
128 sigaction(SIGINT, &act, NULL);
129 sigaction(SIGTERM, &act, NULL);
131 printf("monitor will print the received events for:\n");
133 udev_monitor = udev_monitor_new_from_socket(udev, "@/org/kernel/udev/monitor");
134 if (udev_monitor == NULL) {
138 if (udev_monitor_enable_receiving(udev_monitor) < 0) {
142 printf("UDEV the event which udev sends out after rule processing\n");
145 kernel_monitor = udev_monitor_new_from_netlink(udev);
146 if (kernel_monitor == NULL) {
150 if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
154 printf("UEVENT the kernel uevent\n");
162 if (kernel_monitor != NULL)
163 FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
164 if (udev_monitor != NULL)
165 FD_SET(udev_monitor_get_fd(udev_monitor), &readfds);
167 fdcount = select(UDEV_MAX(udev_monitor_get_fd(kernel_monitor), udev_monitor_get_fd(udev_monitor))+1,
168 &readfds, NULL, NULL, NULL);
171 fprintf(stderr, "error receiving uevent message: %s\n", strerror(errno));
175 if ((kernel_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
176 struct udev_device *device;
178 device = udev_monitor_receive_device(kernel_monitor);
181 print_device(device, "UEVENT", env);
182 udev_device_unref(device);
185 if ((udev_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(udev_monitor), &readfds)) {
186 struct udev_device *device;
188 device = udev_monitor_receive_device(udev_monitor);
191 print_device(device, "UDEV", env);
192 udev_device_unref(device);
197 udev_monitor_unref(udev_monitor);
198 udev_monitor_unref(kernel_monitor);