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
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
/*
* Copyright (C) 2006-2009 Kay Sievers <kay@vrfy.org>
* Copyright (C) 2009 Canonical Ltd.
* Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
*
* 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 <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <syslog.h>
#include <getopt.h>
#include <signal.h>
#include <time.h>
#include <sys/inotify.h>
#include <sys/poll.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "udev.h"
int udevadm_settle(struct udev *udev, int argc, char *argv[])
{
static const struct option options[] = {
{ "seq-start", required_argument, NULL, 's' },
{ "seq-end", required_argument, NULL, 'e' },
{ "timeout", required_argument, NULL, 't' },
{ "exit-if-exists", required_argument, NULL, 'E' },
{ "quiet", no_argument, NULL, 'q' },
{ "help", no_argument, NULL, 'h' },
{}
};
unsigned long long start_usec = now_usec();
unsigned long long start = 0;
unsigned long long end = 0;
int quiet = 0;
const char *exists = NULL;
unsigned int timeout = 120;
struct pollfd pfd[1];
struct udev_queue *udev_queue = NULL;
int rc = EXIT_FAILURE;
dbg(udev, "version %s\n", VERSION);
for (;;) {
int option;
int seconds;
option = getopt_long(argc, argv, "s:e:t:E:qh", options, NULL);
if (option == -1)
break;
switch (option) {
case 's':
start = strtoull(optarg, NULL, 0);
break;
case 'e':
end = strtoull(optarg, NULL, 0);
break;
case 't':
seconds = atoi(optarg);
if (seconds >= 0)
timeout = seconds;
else
fprintf(stderr, "invalid timeout value\n");
dbg(udev, "timeout=%i\n", timeout);
break;
case 'q':
quiet = 1;
break;
case 'E':
exists = optarg;
break;
case 'h':
printf("Usage: udevadm settle OPTIONS\n"
" --timeout=<seconds> maximum time to wait for events\n"
" --seq-start=<seqnum> first seqnum to wait for\n"
" --seq-end=<seqnum> last seqnum to wait for\n"
" --exit-if-exists=<file> stop waiting if file exists\n"
" --quiet do not print list after timeout\n"
" --help\n\n");
exit(0);
}
}
udev_queue = udev_queue_new(udev);
if (udev_queue == NULL)
exit(2);
if (start > 0) {
unsigned long long kernel_seq;
kernel_seq = udev_queue_get_kernel_seqnum(udev_queue);
/* unless specified, the last event is the current kernel seqnum */
if (end == 0)
end = udev_queue_get_kernel_seqnum(udev_queue);
if (start > end) {
err(udev, "seq-start larger than seq-end, ignoring\n");
start = 0;
end = 0;
}
if (start > kernel_seq || end > kernel_seq) {
err(udev, "seq-start or seq-end larger than current kernel value, ignoring\n");
start = 0;
end = 0;
}
info(udev, "start=%llu end=%llu current=%llu\n", start, end, kernel_seq);
} else {
if (end > 0) {
err(udev, "seq-end needs seq-start parameter, ignoring\n");
end = 0;
}
}
/* guarantee that the udev daemon isn't pre-processing */
if (getuid() == 0) {
struct udev_ctrl *uctrl;
uctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
if (uctrl != NULL) {
if (udev_ctrl_send_ping(uctrl, timeout) < 0) {
info(udev, "no connection to daemon\n");
udev_ctrl_unref(uctrl);
rc = EXIT_SUCCESS;
goto out;
}
udev_ctrl_unref(uctrl);
}
}
pfd[0].events = POLLIN;
pfd[0].fd = inotify_init1(IN_CLOEXEC);
if (pfd[0].fd < 0) {
err(udev, "inotify_init failed: %m\n");
} else {
if (inotify_add_watch(pfd[0].fd, udev_get_run_path(udev), IN_MOVED_TO) < 0) {
err(udev, "watching '%s' failed\n", udev_get_run_path(udev));
close(pfd[0].fd);
pfd[0].fd = -1;
}
}
for (;;) {
struct stat statbuf;
if (exists != NULL && stat(exists, &statbuf) == 0) {
rc = EXIT_SUCCESS;
break;
}
if (start > 0) {
/* if asked for, wait for a specific sequence of events */
if (udev_queue_get_seqnum_sequence_is_finished(udev_queue, start, end) == 1) {
rc = EXIT_SUCCESS;
break;
}
} else {
/* exit if queue is empty */
if (udev_queue_get_queue_is_empty(udev_queue)) {
rc = EXIT_SUCCESS;
break;
}
}
if (pfd[0].fd >= 0) {
int delay;
/* wake up after delay, or immediately after the queue is rebuilt */
if (exists != NULL || start > 0)
delay = 100;
else
delay = 1000;
if (poll(pfd, 1, delay) > 0 && pfd[0].revents & POLLIN) {
char buf[sizeof(struct inotify_event) + PATH_MAX];
read(pfd[0].fd, buf, sizeof(buf));
}
} else {
sleep(1);
}
if (timeout > 0) {
unsigned long long age_usec;
age_usec = now_usec() - start_usec;
if (age_usec / (1000 * 1000) >= timeout) {
struct udev_list_entry *list_entry;
if (!quiet && udev_queue_get_queued_list_entry(udev_queue) != NULL) {
info(udev, "timeout waiting for udev queue\n");
printf("\nudevadm settle - timeout of %i seconds reached, the event queue contains:\n", timeout);
udev_list_entry_foreach(list_entry, udev_queue_get_queued_list_entry(udev_queue))
printf(" %s (%s)\n",
udev_list_entry_get_name(list_entry),
udev_list_entry_get_value(list_entry));
}
break;
}
}
}
out:
if (pfd[0].fd >= 0)
close(pfd[0].fd);
udev_queue_unref(udev_queue);
return rc;
}
|
