1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/*
* Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <getopt.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/select.h>
#include <linux/types.h>
#include <linux/netlink.h>
#include "udev.h"
static int udev_exit;
static void asmlinkage sig_handler(int signum)
{
if (signum == SIGINT || signum == SIGTERM)
udev_exit = 1;
}
int udevadm_monitor(struct udev *udev, int argc, char *argv[])
{
struct sigaction act;
int option;
int env = 0;
int print_kernel = 0;
int print_udev = 0;
struct udev_monitor *udev_monitor = NULL;
struct udev_monitor *kernel_monitor = NULL;
fd_set readfds;
int rc = 0;
static const struct option options[] = {
{ "environment", 0, NULL, 'e' },
{ "kernel", 0, NULL, 'k' },
{ "udev", 0, NULL, 'u' },
{ "help", 0, NULL, 'h' },
{}
};
while (1) {
option = getopt_long(argc, argv, "ekuh", options, NULL);
if (option == -1)
break;
switch (option) {
case 'e':
env = 1;
break;
case 'k':
print_kernel = 1;
break;
case 'u':
print_udev = 1;
break;
case 'h':
printf("Usage: udevadm monitor [--environment] [--kernel] [--udev] [--help]\n"
" --env print the whole event environment\n"
" --kernel print kernel uevents\n"
" --udev print udev events\n"
" --help print this help text\n\n");
default:
goto out;
}
}
if (!print_kernel && !print_udev) {
print_kernel = 1;
print_udev =1;
}
if (getuid() != 0 && print_kernel) {
fprintf(stderr, "root privileges needed to subscribe to kernel events\n");
goto out;
}
/* set signal handlers */
memset(&act, 0x00, sizeof(struct sigaction));
act.sa_handler = (void (*)(int)) sig_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
printf("monitor will print the received events for:\n");
if (print_udev) {
udev_monitor = udev_monitor_new_from_socket(udev, "@/org/kernel/udev/monitor");
if (udev_monitor == NULL) {
rc = 1;
goto out;
}
if (udev_monitor_enable_receiving(udev_monitor) < 0) {
rc = 2;
goto out;
}
printf("UDEV the event which udev sends out after rule processing\n");
}
if (print_kernel) {
kernel_monitor = udev_monitor_new_from_netlink(udev);
if (kernel_monitor == NULL) {
rc = 3;
goto out;
}
if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
rc = 4;
goto out;
}
printf("UEVENT the kernel uevent\n");
}
printf("\n");
while (!udev_exit) {
int fdcount;
struct timeval tv;
struct timezone tz;
char timestr[64];
FD_ZERO(&readfds);
if (kernel_monitor != NULL)
FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
if (udev_monitor != NULL)
FD_SET(udev_monitor_get_fd(udev_monitor), &readfds);
fdcount = select(UDEV_MAX(udev_monitor_get_fd(kernel_monitor), udev_monitor_get_fd(udev_monitor))+1,
&readfds, NULL, NULL, NULL);
if (fdcount < 0) {
if (errno != EINTR)
fprintf(stderr, "error receiving uevent message: %s\n", strerror(errno));
continue;
}
if (gettimeofday(&tv, &tz) == 0) {
snprintf(timestr, sizeof(timestr), "%llu.%06u",
(unsigned long long) tv.tv_sec, (unsigned int) tv.tv_usec);
} else
timestr[0] = '\0';
if ((kernel_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
struct udev_device *device = udev_monitor_receive_device(kernel_monitor);
if (device == NULL)
continue;
printf("UEVENT[%s] %-8s %s (%s)\n", timestr,
udev_device_get_action(device),
udev_device_get_devpath(device),
udev_device_get_subsystem(device));
if (env) {
struct udev_list *list;
list = udev_device_get_properties_list(device);
while (list != NULL) {
printf("%s=%s\n", udev_list_get_name(list), udev_list_get_value(list));
list = udev_list_get_next(list);
}
printf("\n");
}
udev_device_unref(device);
}
if ((udev_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(udev_monitor), &readfds)) {
struct udev_device *device = udev_monitor_receive_device(udev_monitor);
if (device == NULL)
continue;
printf("UDEV [%s] %-8s %s (%s)\n", timestr,
udev_device_get_action(device),
udev_device_get_devpath(device),
udev_device_get_subsystem(device));
if (env) {
struct udev_list *list;
list = udev_device_get_properties_list(device);
while (list != NULL) {
printf("%s=%s\n", udev_list_get_name(list), udev_list_get_value(list));
list = udev_list_get_next(list);
}
printf("\n");
}
udev_device_unref(device);
}
}
out:
udev_monitor_unref(udev_monitor);
udev_monitor_unref(kernel_monitor);
return rc;
}
|
