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
|
/*
* udevsend.c
*
* Userspace devfs
*
* Copyright (C) 2004 Ling, Xiaofeng <xiaofeng.ling@intel.com>
* Copyright (C) 2004 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 version 2 of the License.
*
* 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, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/un.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include "udev.h"
#include "udev_version.h"
#include "udevd.h"
#include "logging.h"
unsigned char logname[42];
static inline char *get_action(void)
{
char *action;
action = getenv("ACTION");
return action;
}
static inline char *get_devpath(void)
{
char *devpath;
devpath = getenv("DEVPATH");
return devpath;
}
static inline char *get_seqnum(void)
{
char *seqnum;
seqnum = getenv("SEQNUM");
return seqnum;
}
static int build_hotplugmsg(struct hotplug_msg *msg, char *action,
char *devpath, char *subsystem, int seqnum)
{
memset(msg, 0x00, sizeof(*msg));
strfieldcpy(msg->magic, UDEV_MAGIC);
msg->seqnum = seqnum;
strncpy(msg->action, action, 8);
strncpy(msg->devpath, devpath, 128);
strncpy(msg->subsystem, subsystem, 16);
return sizeof(struct hotplug_msg);
}
static int start_daemon(void)
{
pid_t pid;
pid_t child_pid;
pid = fork();
switch (pid) {
case 0:
/* helper child */
child_pid = fork();
switch (child_pid) {
case 0:
/* daemon */
setsid();
chdir("/");
execl(UDEVD_BIN, "udevd", NULL);
dbg("exec of daemon failed");
exit(1);
case -1:
dbg("fork of daemon failed");
return -1;
default:
exit(0);
}
break;
case -1:
dbg("fork of helper failed");
return -1;
default:
wait(NULL);
}
return 0;
}
int main(int argc, char* argv[])
{
struct hotplug_msg message;
char *action;
char *devpath;
char *subsystem;
char *seqnum;
int seq;
int retval = -EINVAL;
int size;
int loop;
struct timespec tspec;
int sock;
struct sockaddr_un saddr;
init_logging("udevsend");
subsystem = argv[1];
if (subsystem == NULL) {
dbg("no subsystem");
goto exit;
}
devpath = get_devpath();
if (devpath == NULL) {
dbg("no devpath");
goto exit;
}
action = get_action();
if (action == NULL) {
dbg("no action");
goto exit;
}
seqnum = get_seqnum();
if (seqnum == NULL) {
dbg("no seqnum");
goto exit;
}
seq = atoi(seqnum);
sock = socket(AF_LOCAL, SOCK_STREAM, 0);
if (sock == -1) {
dbg("error getting socket");
goto exit;
}
memset(&saddr, 0x00, sizeof(saddr));
saddr.sun_family = AF_LOCAL;
strcpy(saddr.sun_path, UDEVD_SOCK);
/* try to connect, if it fails start daemon */
retval = connect(sock, (struct sockaddr *) &saddr, sizeof(saddr));
if (retval != -1) {
goto send;
} else {
dbg("connect failed, try starting daemon...");
retval = start_daemon();
if (retval == 0) {
dbg("daemon started");
} else {
dbg("error starting daemon");
goto exit;
}
}
/* try to connect while daemon to starts */
tspec.tv_sec = 0;
tspec.tv_nsec = 100000000; /* 100 millisec */
loop = UDEVSEND_CONNECT_RETRY;
while (loop--) {
retval = connect(sock, (struct sockaddr *) &saddr, sizeof(saddr));
if (retval != -1)
goto send;
else
dbg("retry to connect %d",
UDEVSEND_CONNECT_RETRY - loop);
nanosleep(&tspec, NULL);
}
dbg("error connecting to daemon, start daemon failed");
goto exit;
send:
size = build_hotplugmsg(&message, action, devpath, subsystem, seq);
retval = send(sock, &message, size, 0);
if (retval == -1) {
dbg("error sending message");
close (sock);
goto exit;
}
close (sock);
return 0;
exit:
return 1;
}
|
