2 * Copyright (C) 2004-2009 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_monitor *udev_monitor = NULL;
77 struct udev_monitor *kernel_monitor = NULL;
81 static const struct option options[] = {
82 { "property", no_argument, NULL, 'p' },
83 { "environment", no_argument, NULL, 'e' },
84 { "kernel", no_argument, NULL, 'k' },
85 { "udev", no_argument, NULL, 'u' },
86 { "subsystem-match", required_argument, NULL, 's' },
87 { "help", no_argument, NULL, 'h' },
91 udev_list_init(&subsystem_match_list);
93 option = getopt_long(argc, argv, "epkus:h", options, NULL);
110 char subsys[UTIL_NAME_SIZE];
113 util_strscpy(subsys, sizeof(subsys), optarg);
114 devtype = strchr(subsys, ':');
115 if (devtype != NULL) {
119 udev_list_entry_add(udev, &subsystem_match_list, subsys, devtype, 0, 0);
123 printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n"
124 " --property print the event properties\n"
125 " --kernel print kernel uevents\n"
126 " --udev print udev events\n"
127 " --subsystem-match=<subsystem> filter events\n"
134 if (!print_kernel && !print_udev) {
139 /* set signal handlers */
140 memset(&act, 0x00, sizeof(struct sigaction));
141 act.sa_handler = sig_handler;
142 sigemptyset(&act.sa_mask);
143 act.sa_flags = SA_RESTART;
144 sigaction(SIGINT, &act, NULL);
145 sigaction(SIGTERM, &act, NULL);
147 sigaddset(&mask, SIGINT);
148 sigaddset(&mask, SIGTERM);
149 sigprocmask(SIG_UNBLOCK, &mask, NULL);
151 printf("monitor will print the received events for:\n");
153 struct udev_list_entry *entry;
155 udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
156 if (udev_monitor == NULL) {
157 fprintf(stderr, "error: unable to create netlink socket\n");
162 udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
163 const char *subsys = udev_list_entry_get_name(entry);
164 const char *devtype = udev_list_entry_get_value(entry);
166 if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
167 fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
170 if (udev_monitor_enable_receiving(udev_monitor) < 0) {
171 fprintf(stderr, "error: unable to subscribe to udev events\n");
175 printf("UDEV - the event which udev sends out after rule processing\n");
178 struct udev_list_entry *entry;
180 kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
181 if (kernel_monitor == NULL) {
182 fprintf(stderr, "error: unable to create netlink socket\n");
187 udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
188 const char *subsys = udev_list_entry_get_name(entry);
190 if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
191 fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
194 if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
195 fprintf(stderr, "error: unable to subscribe to kernel events\n");
199 printf("KERNEL - the kernel uevent\n");
207 if (kernel_monitor != NULL)
208 FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
209 if (udev_monitor != NULL)
210 FD_SET(udev_monitor_get_fd(udev_monitor), &readfds);
212 fdcount = select(MAX(udev_monitor_get_fd(kernel_monitor), udev_monitor_get_fd(udev_monitor))+1,
213 &readfds, NULL, NULL, NULL);
216 fprintf(stderr, "error receiving uevent message: %m\n");
220 if ((kernel_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
221 struct udev_device *device;
223 device = udev_monitor_receive_device(kernel_monitor);
226 print_device(device, "KERNEL", prop);
227 udev_device_unref(device);
230 if ((udev_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(udev_monitor), &readfds)) {
231 struct udev_device *device;
233 device = udev_monitor_receive_device(udev_monitor);
236 print_device(device, "UDEV", prop);
237 udev_device_unref(device);
242 udev_monitor_unref(udev_monitor);
243 udev_monitor_unref(kernel_monitor);
244 udev_list_cleanup_entries(udev, &subsystem_match_list);