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 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_list_node subsystem_match_list;
75 struct udev_monitor *udev_monitor = NULL;
76 struct udev_monitor *kernel_monitor = NULL;
80 static const struct option options[] = {
81 { "environment", no_argument, NULL, 'e' },
82 { "kernel", no_argument, NULL, 'k' },
83 { "udev", no_argument, NULL, 'u' },
84 { "subsystem-match", required_argument, NULL, 's' },
85 { "help", no_argument, NULL, 'h' },
89 udev_list_init(&subsystem_match_list);
91 option = getopt_long(argc, argv, "ekus:h", options, NULL);
107 char subsys[UTIL_NAME_SIZE];
110 util_strscpy(subsys, sizeof(subsys), optarg);
111 devtype = strchr(subsys, ':');
112 if (devtype != NULL) {
116 udev_list_entry_add(udev, &subsystem_match_list, subsys, devtype, 0, 0);
120 printf("Usage: udevadm monitor [--environment] [--kernel] [--udev] [--help]\n"
121 " --env print the whole event environment\n"
122 " --kernel print kernel uevents\n"
123 " --udev print udev events\n"
124 " --subsystem-match=<subsystem> filter events\n"
131 if (!print_kernel && !print_udev) {
136 /* set signal handlers */
137 memset(&act, 0x00, sizeof(struct sigaction));
138 act.sa_handler = sig_handler;
139 sigemptyset(&act.sa_mask);
140 act.sa_flags = SA_RESTART;
141 sigaction(SIGINT, &act, NULL);
142 sigaction(SIGTERM, &act, NULL);
144 printf("monitor will print the received events for:\n");
146 struct udev_list_entry *entry;
148 udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
149 if (udev_monitor == NULL) {
150 fprintf(stderr, "error: unable to create netlink socket\n");
155 udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
156 const char *subsys = udev_list_entry_get_name(entry);
157 const char *devtype = udev_list_entry_get_value(entry);
159 if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
160 fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
163 if (udev_monitor_enable_receiving(udev_monitor) < 0) {
164 fprintf(stderr, "error: unable to subscribe to udev events\n");
168 printf("UDEV - the event which udev sends out after rule processing\n");
171 struct udev_list_entry *entry;
173 kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
174 if (kernel_monitor == NULL) {
175 fprintf(stderr, "error: unable to create netlink socket\n");
180 udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
181 const char *subsys = udev_list_entry_get_name(entry);
183 if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
184 fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
187 if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
188 fprintf(stderr, "error: unable to subscribe to kernel events\n");
192 printf("KERNEL - the kernel uevent\n");
200 if (kernel_monitor != NULL)
201 FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
202 if (udev_monitor != NULL)
203 FD_SET(udev_monitor_get_fd(udev_monitor), &readfds);
205 fdcount = select(UDEV_MAX(udev_monitor_get_fd(kernel_monitor), udev_monitor_get_fd(udev_monitor))+1,
206 &readfds, NULL, NULL, NULL);
209 fprintf(stderr, "error receiving uevent message: %m\n");
213 if ((kernel_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
214 struct udev_device *device;
216 device = udev_monitor_receive_device(kernel_monitor);
219 print_device(device, "KERNEL", env);
220 udev_device_unref(device);
223 if ((udev_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(udev_monitor), &readfds)) {
224 struct udev_device *device;
226 device = udev_monitor_receive_device(udev_monitor);
229 print_device(device, "UDEV", env);
230 udev_device_unref(device);
235 udev_monitor_unref(udev_monitor);
236 udev_monitor_unref(kernel_monitor);
237 udev_list_cleanup_entries(udev, &subsystem_match_list);