1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 * Copyright (C) 2004-2010 Kay Sievers <kay@vrfy.org>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
26 #include <sys/epoll.h>
31 #include "formats-util.h"
32 #include "udev-util.h"
35 static bool udev_exit
;
37 static void sig_handler(int signum
) {
38 if (signum
== SIGINT
|| signum
== SIGTERM
)
42 static void print_device(struct udev_device
*device
, const char *source
, int prop
) {
45 clock_gettime(CLOCK_MONOTONIC
, &ts
);
46 printf("%-6s[%"PRI_TIME
".%06ld] %-8s %s (%s)\n",
48 ts
.tv_sec
, ts
.tv_nsec
/1000,
49 udev_device_get_action(device
),
50 udev_device_get_devpath(device
),
51 udev_device_get_subsystem(device
));
53 struct udev_list_entry
*list_entry
;
55 udev_list_entry_foreach(list_entry
, udev_device_get_properties_list_entry(device
))
57 udev_list_entry_get_name(list_entry
),
58 udev_list_entry_get_value(list_entry
));
63 static void help(void) {
64 printf("%s monitor [--property] [--kernel] [--udev] [--help]\n\n"
65 "Listen to kernel and udev events.\n\n"
66 " -h --help Show this help\n"
67 " --version Show package version\n"
68 " -p --property Print the event properties\n"
69 " -k --kernel Print kernel uevents\n"
70 " -u --udev Print udev events\n"
71 " -s --subsystem-match=SUBSYSTEM[/DEVTYPE] Filter events by subsystem\n"
72 " -t --tag-match=TAG Filter events by tag\n"
73 , program_invocation_short_name
);
76 static int adm_monitor(struct udev
*udev
, int argc
, char *argv
[]) {
77 struct sigaction act
= {};
80 bool print_kernel
= false;
81 bool print_udev
= false;
82 _cleanup_udev_list_cleanup_
struct udev_list subsystem_match_list
;
83 _cleanup_udev_list_cleanup_
struct udev_list tag_match_list
;
84 _cleanup_udev_monitor_unref_
struct udev_monitor
*udev_monitor
= NULL
;
85 _cleanup_udev_monitor_unref_
struct udev_monitor
*kernel_monitor
= NULL
;
86 _cleanup_close_
int fd_ep
= -1;
87 int fd_kernel
= -1, fd_udev
= -1;
88 struct epoll_event ep_kernel
, ep_udev
;
91 static const struct option options
[] = {
92 { "property", no_argument
, NULL
, 'p' },
93 { "environment", no_argument
, NULL
, 'e' }, /* alias for -p */
94 { "kernel", no_argument
, NULL
, 'k' },
95 { "udev", no_argument
, NULL
, 'u' },
96 { "subsystem-match", required_argument
, NULL
, 's' },
97 { "tag-match", required_argument
, NULL
, 't' },
98 { "help", no_argument
, NULL
, 'h' },
102 udev_list_init(udev
, &subsystem_match_list
, true);
103 udev_list_init(udev
, &tag_match_list
, true);
105 while((c
= getopt_long(argc
, argv
, "pekus:t:h", options
, NULL
)) >= 0)
119 char subsys
[UTIL_NAME_SIZE
];
122 strscpy(subsys
, sizeof(subsys
), optarg
);
123 devtype
= strchr(subsys
, '/');
124 if (devtype
!= NULL
) {
128 udev_list_entry_add(&subsystem_match_list
, subsys
, devtype
);
132 udev_list_entry_add(&tag_match_list
, optarg
, NULL
);
141 if (!print_kernel
&& !print_udev
) {
146 /* set signal handlers */
147 act
.sa_handler
= sig_handler
;
148 act
.sa_flags
= SA_RESTART
;
149 sigaction(SIGINT
, &act
, NULL
);
150 sigaction(SIGTERM
, &act
, NULL
);
152 sigaddset(&mask
, SIGINT
);
153 sigaddset(&mask
, SIGTERM
);
154 sigprocmask(SIG_UNBLOCK
, &mask
, NULL
);
156 fd_ep
= epoll_create1(EPOLL_CLOEXEC
);
158 log_error_errno(errno
, "error creating epoll fd: %m");
162 printf("monitor will print the received events for:\n");
164 struct udev_list_entry
*entry
;
166 udev_monitor
= udev_monitor_new_from_netlink(udev
, "udev");
167 if (udev_monitor
== NULL
) {
168 fprintf(stderr
, "error: unable to create netlink socket\n");
171 udev_monitor_set_receive_buffer_size(udev_monitor
, 128*1024*1024);
172 fd_udev
= udev_monitor_get_fd(udev_monitor
);
174 udev_list_entry_foreach(entry
, udev_list_get_entry(&subsystem_match_list
)) {
175 const char *subsys
= udev_list_entry_get_name(entry
);
176 const char *devtype
= udev_list_entry_get_value(entry
);
178 if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor
, subsys
, devtype
) < 0)
179 fprintf(stderr
, "error: unable to apply subsystem filter '%s'\n", subsys
);
182 udev_list_entry_foreach(entry
, udev_list_get_entry(&tag_match_list
)) {
183 const char *tag
= udev_list_entry_get_name(entry
);
185 if (udev_monitor_filter_add_match_tag(udev_monitor
, tag
) < 0)
186 fprintf(stderr
, "error: unable to apply tag filter '%s'\n", tag
);
189 if (udev_monitor_enable_receiving(udev_monitor
) < 0) {
190 fprintf(stderr
, "error: unable to subscribe to udev events\n");
194 memzero(&ep_udev
, sizeof(struct epoll_event
));
195 ep_udev
.events
= EPOLLIN
;
196 ep_udev
.data
.fd
= fd_udev
;
197 if (epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_udev
, &ep_udev
) < 0) {
198 log_error_errno(errno
, "fail to add fd to epoll: %m");
202 printf("UDEV - the event which udev sends out after rule processing\n");
206 struct udev_list_entry
*entry
;
208 kernel_monitor
= udev_monitor_new_from_netlink(udev
, "kernel");
209 if (kernel_monitor
== NULL
) {
210 fprintf(stderr
, "error: unable to create netlink socket\n");
213 udev_monitor_set_receive_buffer_size(kernel_monitor
, 128*1024*1024);
214 fd_kernel
= udev_monitor_get_fd(kernel_monitor
);
216 udev_list_entry_foreach(entry
, udev_list_get_entry(&subsystem_match_list
)) {
217 const char *subsys
= udev_list_entry_get_name(entry
);
219 if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor
, subsys
, NULL
) < 0)
220 fprintf(stderr
, "error: unable to apply subsystem filter '%s'\n", subsys
);
223 if (udev_monitor_enable_receiving(kernel_monitor
) < 0) {
224 fprintf(stderr
, "error: unable to subscribe to kernel events\n");
228 memzero(&ep_kernel
, sizeof(struct epoll_event
));
229 ep_kernel
.events
= EPOLLIN
;
230 ep_kernel
.data
.fd
= fd_kernel
;
231 if (epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_kernel
, &ep_kernel
) < 0) {
232 log_error_errno(errno
, "fail to add fd to epoll: %m");
236 printf("KERNEL - the kernel uevent\n");
242 struct epoll_event ev
[4];
245 fdcount
= epoll_wait(fd_ep
, ev
, ELEMENTSOF(ev
), -1);
248 fprintf(stderr
, "error receiving uevent message: %m\n");
252 for (i
= 0; i
< fdcount
; i
++) {
253 if (ev
[i
].data
.fd
== fd_kernel
&& ev
[i
].events
& EPOLLIN
) {
254 struct udev_device
*device
;
256 device
= udev_monitor_receive_device(kernel_monitor
);
259 print_device(device
, "KERNEL", prop
);
260 udev_device_unref(device
);
261 } else if (ev
[i
].data
.fd
== fd_udev
&& ev
[i
].events
& EPOLLIN
) {
262 struct udev_device
*device
;
264 device
= udev_monitor_receive_device(udev_monitor
);
267 print_device(device
, "UDEV", prop
);
268 udev_device_unref(device
);
276 const struct udevadm_cmd udevadm_monitor
= {
279 .help
= "Listen to kernel and udev events",