2 * Copyright (C) 2004-2010 Kay Sievers <kay@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/>.
29 #include <sys/socket.h>
31 #include <sys/epoll.h>
32 #include <linux/types.h>
33 #include <linux/netlink.h>
37 static bool udev_exit;
39 static void sig_handler(int signum)
41 if (signum == SIGINT || signum == SIGTERM)
45 static void print_device(struct udev_device *device, const char *source, int prop)
49 clock_gettime(CLOCK_MONOTONIC, &ts);
50 printf("%-6s[%llu.%06u] %-8s %s (%s)\n",
52 (unsigned long long) ts.tv_sec, (unsigned int) ts.tv_nsec/1000,
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 static int adm_monitor(struct udev *udev, int argc, char *argv[])
69 struct sigaction act = {};
73 bool print_kernel = false;
74 bool print_udev = false;
75 struct udev_list subsystem_match_list;
76 struct udev_list tag_match_list;
77 struct udev_monitor *udev_monitor = NULL;
78 struct udev_monitor *kernel_monitor = NULL;
80 int fd_kernel = -1, fd_udev = -1;
81 struct epoll_event ep_kernel, ep_udev;
84 static const struct option options[] = {
85 { "property", no_argument, NULL, 'p' },
86 { "environment", no_argument, NULL, 'e' },
87 { "kernel", no_argument, NULL, 'k' },
88 { "udev", no_argument, NULL, 'u' },
89 { "subsystem-match", required_argument, NULL, 's' },
90 { "tag-match", required_argument, NULL, 't' },
91 { "help", no_argument, NULL, 'h' },
95 udev_list_init(udev, &subsystem_match_list, true);
96 udev_list_init(udev, &tag_match_list, true);
99 option = getopt_long(argc, argv, "pekus:t:h", options, NULL);
116 char subsys[UTIL_NAME_SIZE];
119 strscpy(subsys, sizeof(subsys), optarg);
120 devtype = strchr(subsys, '/');
121 if (devtype != NULL) {
125 udev_list_entry_add(&subsystem_match_list, subsys, devtype);
129 udev_list_entry_add(&tag_match_list, optarg, NULL);
132 printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n"
133 " --property print the event properties\n"
134 " --kernel print kernel uevents\n"
135 " --udev print udev events\n"
136 " --subsystem-match=<subsystem[/devtype]> filter events by subsystem\n"
137 " --tag-match=<tag> filter events by tag\n"
146 if (!print_kernel && !print_udev) {
151 /* set signal handlers */
152 act.sa_handler = sig_handler;
153 act.sa_flags = SA_RESTART;
154 sigaction(SIGINT, &act, NULL);
155 sigaction(SIGTERM, &act, NULL);
157 sigaddset(&mask, SIGINT);
158 sigaddset(&mask, SIGTERM);
159 sigprocmask(SIG_UNBLOCK, &mask, NULL);
161 fd_ep = epoll_create1(EPOLL_CLOEXEC);
163 log_error("error creating epoll fd: %m\n");
167 printf("monitor will print the received events for:\n");
169 struct udev_list_entry *entry;
171 udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
172 if (udev_monitor == NULL) {
173 fprintf(stderr, "error: unable to create netlink socket\n");
177 udev_monitor_set_receive_buffer_size(udev_monitor, 128*1024*1024);
178 fd_udev = udev_monitor_get_fd(udev_monitor);
180 udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
181 const char *subsys = udev_list_entry_get_name(entry);
182 const char *devtype = udev_list_entry_get_value(entry);
184 if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
185 fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
188 udev_list_entry_foreach(entry, udev_list_get_entry(&tag_match_list)) {
189 const char *tag = udev_list_entry_get_name(entry);
191 if (udev_monitor_filter_add_match_tag(udev_monitor, tag) < 0)
192 fprintf(stderr, "error: unable to apply tag filter '%s'\n", tag);
195 if (udev_monitor_enable_receiving(udev_monitor) < 0) {
196 fprintf(stderr, "error: unable to subscribe to udev events\n");
201 memset(&ep_udev, 0, sizeof(struct epoll_event));
202 ep_udev.events = EPOLLIN;
203 ep_udev.data.fd = fd_udev;
204 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) {
205 log_error("fail to add fd to epoll: %m\n");
209 printf("UDEV - the event which udev sends out after rule processing\n");
213 struct udev_list_entry *entry;
215 kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
216 if (kernel_monitor == NULL) {
217 fprintf(stderr, "error: unable to create netlink socket\n");
221 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
222 fd_kernel = udev_monitor_get_fd(kernel_monitor);
224 udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
225 const char *subsys = udev_list_entry_get_name(entry);
227 if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
228 fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
231 if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
232 fprintf(stderr, "error: unable to subscribe to kernel events\n");
237 memset(&ep_kernel, 0, sizeof(struct epoll_event));
238 ep_kernel.events = EPOLLIN;
239 ep_kernel.data.fd = fd_kernel;
240 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_kernel, &ep_kernel) < 0) {
241 log_error("fail to add fd to epoll: %m\n");
245 printf("KERNEL - the kernel uevent\n");
251 struct epoll_event ev[4];
254 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
257 fprintf(stderr, "error receiving uevent message: %m\n");
261 for (i = 0; i < fdcount; i++) {
262 if (ev[i].data.fd == fd_kernel && ev[i].events & EPOLLIN) {
263 struct udev_device *device;
265 device = udev_monitor_receive_device(kernel_monitor);
268 print_device(device, "KERNEL", prop);
269 udev_device_unref(device);
270 } else if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
271 struct udev_device *device;
273 device = udev_monitor_receive_device(udev_monitor);
276 print_device(device, "UDEV", prop);
277 udev_device_unref(device);
284 udev_monitor_unref(udev_monitor);
285 udev_monitor_unref(kernel_monitor);
286 udev_list_cleanup(&subsystem_match_list);
287 udev_list_cleanup(&tag_match_list);
291 const struct udevadm_cmd udevadm_monitor = {
294 .help = "listen to kernel and udev events",