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
|
/*
* wait_for_sysfs.c - small program to delay the execution
* of /etc/hotplug.d/ programs, until sysfs
* is fully populated by the kernel. Depending on
* the type of device, we wait for all expected
* directories and then just exit.
*
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.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 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 <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/stat.h>
#include "logging.h"
#include "udev_version.h"
#include "udev_sysfs.h"
#include "libsysfs/sysfs/libsysfs.h"
#ifdef LOG
unsigned char logname[LOGNAME_SIZE];
void log_message(int level, const char *format, ...)
{
va_list args;
va_start(args, format);
vsyslog(level, format, args);
va_end(args);
}
#endif
int main(int argc, char *argv[], char *envp[])
{
const char *devpath = "";
const char *action;
const char *subsystem;
char sysfs_mnt_path[SYSFS_PATH_MAX];
char filename[SYSFS_PATH_MAX];
struct sysfs_class_device *class_dev;
struct sysfs_device *devices_dev;
int rc = 0;
const char *error = NULL;
logging_init("wait_for_sysfs");
if (argc != 2) {
dbg("error: subsystem");
return 1;
}
subsystem = argv[1];
devpath = getenv ("DEVPATH");
if (!devpath) {
dbg("error: no DEVPATH");
rc = 1;
goto exit;
}
action = getenv ("ACTION");
if (!action) {
dbg("error: no ACTION");
rc = 1;
goto exit;
}
/* we only wait on an add event */
if (strcmp(action, "add") != 0) {
dbg("no add ACTION");
goto exit;
}
if (sysfs_get_mnt_path(sysfs_mnt_path, SYSFS_PATH_MAX) != 0) {
dbg("error: no sysfs path");
rc = 2;
goto exit;
}
if ((strncmp(devpath, "/block/", 7) == 0) || (strncmp(devpath, "/class/", 7) == 0)) {
snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_mnt_path, devpath);
filename[SYSFS_PATH_MAX-1] = '\0';
/* skip bad events where we get no device for the class */
if (strncmp(devpath, "/class/", 7) == 0 && strchr(&devpath[7], '/') == NULL) {
dbg("no device name for '%s', bad event", devpath);
goto exit;
}
/* open the class device we are called for */
class_dev = open_class_device_wait(filename);
if (!class_dev) {
dbg("error: class device unavailable (probably remove has beaten us)");
goto exit;
}
dbg("class device opened '%s'", filename);
/* wait for the class device with possible physical device and bus */
wait_for_class_device(class_dev, &error);
/*
* we got too many unfixable class/net errors, kernel later than 2.6.10-rc1 will
* solve this by exporting the needed information with the hotplug event
* until we use this just don't print any error for net devices, but still
* wait for it.
*/
if (strncmp(devpath, "/class/net/", 11) == 0)
error = NULL;
sysfs_close_class_device(class_dev);
} else if ((strncmp(devpath, "/devices/", 9) == 0)) {
snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_mnt_path, devpath);
filename[SYSFS_PATH_MAX-1] = '\0';
/* open the path we are called for */
devices_dev = open_devices_device_wait(filename);
if (!devices_dev) {
dbg("error: devices device unavailable (probably remove has beaten us)");
goto exit;
}
dbg("devices device opened '%s'", filename);
/* wait for the bus value */
wait_for_bus_device(devices_dev, &error);
sysfs_close_device(devices_dev);
} else {
dbg("unhandled sysfs path, no need to wait");
}
exit:
if (error) {
info("either wait_for_sysfs (udev %s) needs an update to handle the device '%s' "
"properly (%s) or the sysfs-support of your device's driver needs to be fixed, "
"please report to <linux-hotplug-devel@lists.sourceforge.net>",
UDEV_VERSION, devpath, error);
rc =3;
} else {
dbg("result: waiting for sysfs successful '%s'", devpath);
}
logging_close();
exit(rc);
}
|
