2 * Copyright (C) 2004-2010 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 prop)
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[])
75 struct udev_list_node subsystem_match_list;
76 struct udev_list_node tag_match_list;
77 struct udev_monitor *udev_monitor = NULL;
78 struct udev_monitor *kernel_monitor = NULL;
82 static const struct option options[] = {
83 { "property", no_argument, NULL, 'p' },
84 { "environment", no_argument, NULL, 'e' },
85 { "kernel", no_argument, NULL, 'k' },
86 { "udev", no_argument, NULL, 'u' },
87 { "subsystem-match", required_argument, NULL, 's' },
88 { "tag-match", required_argument, NULL, 't' },
89 { "help", no_argument, NULL, 'h' },
93 udev_list_init(&subsystem_match_list);
94 udev_list_init(&tag_match_list);
96 option = getopt_long(argc, argv, "pekus:t:h", options, NULL);
113 char subsys[UTIL_NAME_SIZE];
116 util_strscpy(subsys, sizeof(subsys), optarg);
117 devtype = strchr(subsys, '/');
118 if (devtype != NULL) {
122 udev_list_entry_add(udev, &subsystem_match_list, subsys, devtype, 0, 0);
126 udev_list_entry_add(udev, &tag_match_list, optarg, NULL, 0, 0);
129 printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n"
130 " --property print the event properties\n"
131 " --kernel print kernel uevents\n"
132 " --udev print udev events\n"
133 " --subsystem-match=<subsystem[/devtype]> filter events by subsystem\n"
134 " --tag-match=<tag> filter events by tag\n"
141 if (!print_kernel && !print_udev) {
146 /* set signal handlers */
147 memset(&act, 0x00, sizeof(struct sigaction));
148 act.sa_handler = sig_handler;
149 sigemptyset(&act.sa_mask);
150 act.sa_flags = SA_RESTART;
151 sigaction(SIGINT, &act, NULL);
152 sigaction(SIGTERM, &act, NULL);
154 sigaddset(&mask, SIGINT);
155 sigaddset(&mask, SIGTERM);
156 sigprocmask(SIG_UNBLOCK, &mask, NULL);
158 printf("monitor will print the received events for:\n");
160 struct udev_list_entry *entry;
162 udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
163 if (udev_monitor == NULL) {
164 fprintf(stderr, "error: unable to create netlink socket\n");
168 udev_monitor_set_receive_buffer_size(udev_monitor, 128*1024*1024);
170 udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
171 const char *subsys = udev_list_entry_get_name(entry);
172 const char *devtype = udev_list_entry_get_value(entry);
174 if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
175 fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
178 udev_list_entry_foreach(entry, udev_list_get_entry(&tag_match_list)) {
179 const char *tag = udev_list_entry_get_name(entry);
181 if (udev_monitor_filter_add_match_tag(udev_monitor, tag) < 0)
182 fprintf(stderr, "error: unable to apply tag filter '%s'\n", tag);
185 if (udev_monitor_enable_receiving(udev_monitor) < 0) {
186 fprintf(stderr, "error: unable to subscribe to udev events\n");
190 printf("UDEV - the event which udev sends out after rule processing\n");
193 struct udev_list_entry *entry;
195 kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
196 if (kernel_monitor == NULL) {
197 fprintf(stderr, "error: unable to create netlink socket\n");
201 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
203 udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
204 const char *subsys = udev_list_entry_get_name(entry);
206 if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
207 fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
210 if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
211 fprintf(stderr, "error: unable to subscribe to kernel events\n");
215 printf("KERNEL - the kernel uevent\n");
223 if (kernel_monitor != NULL)
224 FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
225 if (udev_monitor != NULL)
226 FD_SET(udev_monitor_get_fd(udev_monitor), &readfds);
228 fdcount = select(MAX(udev_monitor_get_fd(kernel_monitor), udev_monitor_get_fd(udev_monitor))+1,
229 &readfds, NULL, NULL, NULL);
232 fprintf(stderr, "error receiving uevent message: %m\n");
236 if ((kernel_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
237 struct udev_device *device;
239 device = udev_monitor_receive_device(kernel_monitor);
242 print_device(device, "KERNEL", prop);
243 udev_device_unref(device);
246 if ((udev_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(udev_monitor), &readfds)) {
247 struct udev_device *device;
249 device = udev_monitor_receive_device(udev_monitor);
252 print_device(device, "UDEV", prop);
253 udev_device_unref(device);
258 udev_monitor_unref(udev_monitor);
259 udev_monitor_unref(kernel_monitor);
260 udev_list_cleanup_entries(udev, &subsystem_match_list);
261 udev_list_cleanup_entries(udev, &tag_match_list);