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
|
/*
* udev_event.c - udev event process
*
* Copyright (C) 2004, 2005 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 <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <dirent.h>
#include <syslog.h>
#include "udev_libc_wrapper.h"
#include "udev.h"
#include "logging.h"
#include "udev_rules.h"
#include "udev_utils.h"
#include "udev_sysfs.h"
#include "list.h"
int udev_process_event(struct udev_rules *rules, struct udevice *udev)
{
int retval;
char path[PATH_SIZE];
const char *error;
if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS || udev->type == DEV_NET) {
/* handle device node */
if (strcmp(udev->action, "add") == 0) {
struct sysfs_class_device *class_dev;
/* wait for sysfs of /sys/class /sys/block */
dbg("node add");
snprintf(path, sizeof(path), "%s%s", sysfs_path, udev->devpath);
path[sizeof(path)-1] = '\0';
class_dev = wait_class_device_open(path);
if (class_dev == NULL) {
dbg("open class device failed");
return 0;
}
dbg("opened class_dev->name='%s'", class_dev->name);
wait_for_class_device(class_dev, &error);
/* get major/minor */
if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS)
udev->devt = get_devt(class_dev);
if (udev->type == DEV_NET || udev->devt) {
/* name device */
udev_rules_get_name(rules, udev, class_dev);
if (udev->ignore_device) {
info("device event will be ignored");
sysfs_close_class_device(class_dev);
return -1;
}
if (udev->name[0] != '\0') {
/* create node, store in db */
retval = udev_add_device(udev, class_dev);
} else {
info("device node creation supressed");
}
} else {
dbg("no dev-file found");
udev_rules_get_run(rules, udev, class_dev, NULL);
if (udev->ignore_device) {
info("device event will be ignored");
sysfs_close_class_device(class_dev);
return -1;
}
}
sysfs_close_class_device(class_dev);
} else if (strcmp(udev->action, "remove") == 0) {
struct name_entry *name_loop;
/* get data from db, remove db-entry, delete node */
dbg("node remove");
retval = udev_remove_device(udev);
/* restore stored persistent data */
list_for_each_entry(name_loop, &udev->env_list, node)
putenv(name_loop->name);
udev_rules_get_run(rules, udev, NULL, NULL);
if (udev->ignore_device) {
dbg("device event will be ignored");
return -1;
}
}
/* export name of device node or netif */
if (udev->devname[0] != '\0')
setenv("DEVNAME", udev->devname, 1);
} else if (udev->type == DEV_DEVICE && strcmp(udev->action, "add") == 0) {
struct sysfs_device *devices_dev;
/* wait for sysfs of /sys/devices/ */
dbg("devices add");
snprintf(path, sizeof(path), "%s%s", sysfs_path, udev->devpath);
path[sizeof(path)-1] = '\0';
devices_dev = wait_devices_device_open(path);
if (!devices_dev) {
dbg("devices device unavailable (probably remove has beaten us)");
return 0;
}
dbg("devices device opened '%s'", path);
wait_for_devices_device(devices_dev, &error);
udev_rules_get_run(rules, udev, NULL, devices_dev);
sysfs_close_device(devices_dev);
if (udev->ignore_device) {
info("device event will be ignored");
return -1;
}
} else {
dbg("default handling");
udev_rules_get_run(rules, udev, NULL, NULL);
if (udev->ignore_device) {
info("device event will be ignored");
return -1;
}
}
return 0;
}
|
