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Commit | Line | Data |
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f0083e3d GKH |
1 | /* |
2 | * udev.c | |
3 | * | |
4 | * Userspace devfs | |
5 | * | |
8202eb32 | 6 | * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com> |
f0083e3d GKH |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation version 2 of the License. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * with this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | * | |
21 | */ | |
22 | ||
8dc0e138 | 23 | #define _KLIBC_HAS_ARCH_SIG_ATOMIC_T |
c81b35c0 KS |
24 | #include <stdio.h> |
25 | #include <stddef.h> | |
f0083e3d GKH |
26 | #include <stdlib.h> |
27 | #include <string.h> | |
e8baccca | 28 | #include <ctype.h> |
c81b35c0 | 29 | #include <errno.h> |
d12ecb53 | 30 | #include <signal.h> |
1ceba936 | 31 | #include <unistd.h> |
85511f02 | 32 | |
c80da508 | 33 | #include "libsysfs/sysfs/libsysfs.h" |
f0083e3d | 34 | #include "udev.h" |
c81b35c0 | 35 | #include "udev_lib.h" |
f0713480 | 36 | #include "udev_sysfs.h" |
f0083e3d | 37 | #include "udev_version.h" |
54988802 | 38 | #include "logging.h" |
2232cac8 | 39 | #include "namedev.h" |
dbfc520c | 40 | #include "udevdb.h" |
f0083e3d | 41 | |
7e89a569 KS |
42 | /* timeout flag for udevdb */ |
43 | extern sig_atomic_t gotalarm; | |
44 | ||
c056c514 GKH |
45 | /* global variables */ |
46 | char **main_argv; | |
47 | char **main_envp; | |
48 | ||
d026a35d | 49 | #ifdef LOG |
d00bd172 | 50 | unsigned char logname[LOGNAME_SIZE]; |
3fe07342 | 51 | void log_message(int level, const char *format, ...) |
51a8bb2f | 52 | { |
e964c2c0 | 53 | va_list args; |
d026a35d GKH |
54 | |
55 | if (!udev_log) | |
56 | return; | |
57 | ||
58 | va_start(args, format); | |
59 | vsyslog(level, format, args); | |
60 | va_end(args); | |
51a8bb2f | 61 | } |
d026a35d | 62 | #endif |
51a8bb2f | 63 | |
e5a5b54a | 64 | static void asmlinkage sig_handler(int signum) |
d12ecb53 | 65 | { |
d12ecb53 | 66 | switch (signum) { |
7e89a569 KS |
67 | case SIGALRM: |
68 | gotalarm = 1; | |
69 | info("error: timeout reached, event probably not handled correctly"); | |
70 | break; | |
d12ecb53 MB |
71 | case SIGINT: |
72 | case SIGTERM: | |
d12ecb53 MB |
73 | udevdb_exit(); |
74 | exit(20 + signum); | |
d12ecb53 | 75 | default: |
47bf9196 | 76 | dbg("unhandled signal %d", signum); |
d12ecb53 MB |
77 | } |
78 | } | |
79 | ||
aee380b6 | 80 | int main(int argc, char *argv[], char *envp[]) |
f4dc8d11 | 81 | { |
f8911dbb | 82 | struct sigaction act; |
7a947ce5 KS |
83 | struct sysfs_class_device *class_dev; |
84 | struct udevice udev; | |
85 | char path[SYSFS_PATH_MAX]; | |
aee380b6 KS |
86 | int retval = -EINVAL; |
87 | enum { | |
88 | ADD, | |
89 | REMOVE, | |
90 | UDEVSTART, | |
91 | } act_type; | |
f4dc8d11 | 92 | |
aee380b6 | 93 | dbg("version %s", UDEV_VERSION); |
2232cac8 | 94 | |
92307b9e PM |
95 | main_argv = argv; |
96 | main_envp = envp; | |
97 | ||
7257cb18 | 98 | logging_init("udev"); |
7e89a569 | 99 | |
aee380b6 | 100 | udev_init_config(); |
af815f88 | 101 | |
aee380b6 KS |
102 | if (strstr(argv[0], "udevstart")) { |
103 | act_type = UDEVSTART; | |
104 | } else { | |
7a947ce5 KS |
105 | const char *action = get_action(); |
106 | const char *devpath = get_devpath(); | |
107 | const char *subsystem = get_subsystem(main_argv[1]); | |
108 | ||
aee380b6 KS |
109 | if (!action) { |
110 | dbg("no action?"); | |
111 | goto exit; | |
112 | } | |
113 | if (strcmp(action, "add") == 0) { | |
114 | act_type = ADD; | |
115 | } else if (strcmp(action, "remove") == 0) { | |
116 | act_type = REMOVE; | |
117 | } else { | |
7a947ce5 | 118 | dbg("no action '%s' for us", action); |
8eb38ef8 GKH |
119 | goto exit; |
120 | } | |
f0083e3d | 121 | |
aee380b6 KS |
122 | if (!devpath) { |
123 | dbg("no devpath?"); | |
124 | goto exit; | |
125 | } | |
f0713480 | 126 | dbg("looking at '%s'", devpath); |
aee380b6 KS |
127 | |
128 | /* we only care about class devices and block stuff */ | |
6d74f996 | 129 | if (!strstr(devpath, "class") && !strstr(devpath, "block")) { |
aee380b6 KS |
130 | dbg("not a block or class device"); |
131 | goto exit; | |
132 | } | |
133 | ||
aee380b6 | 134 | if (!subsystem) { |
7a947ce5 | 135 | dbg("no subsystem"); |
aee380b6 KS |
136 | goto exit; |
137 | } | |
138 | ||
f0713480 KS |
139 | udev_set_values(&udev, devpath, subsystem); |
140 | ||
aee380b6 | 141 | /* skip blacklisted subsystems */ |
f0713480 | 142 | if (udev.type != 'n' && subsystem_expect_no_dev(subsystem)) { |
707680b1 | 143 | dbg("don't care about '%s' devices", subsystem); |
7a947ce5 | 144 | goto exit; |
707680b1 | 145 | }; |
7a947ce5 | 146 | |
dbfc520c DS |
147 | } |
148 | ||
47bf9196 | 149 | /* set signal handlers */ |
dc117daa | 150 | act.sa_handler = (void (*) (int))sig_handler; |
f8911dbb | 151 | sigemptyset (&act.sa_mask); |
707680b1 | 152 | /* alarm must not restart syscalls*/ |
7e89a569 | 153 | sigaction(SIGALRM, &act, NULL); |
f8911dbb KS |
154 | sigaction(SIGINT, &act, NULL); |
155 | sigaction(SIGTERM, &act, NULL); | |
3fd52a76 | 156 | |
7e89a569 KS |
157 | /* trigger timout to interrupt blocking syscalls */ |
158 | alarm(ALARM_TIMEOUT); | |
159 | ||
aee380b6 | 160 | /* initialize udev database */ |
7e89a569 KS |
161 | if (udevdb_init(UDEVDB_DEFAULT) != 0) |
162 | info("error: unable to initialize database, continuing without database"); | |
f61d732a | 163 | |
aee380b6 KS |
164 | switch(act_type) { |
165 | case UDEVSTART: | |
166 | dbg("udevstart"); | |
167 | namedev_init(); | |
aee380b6 KS |
168 | retval = udev_start(); |
169 | break; | |
170 | case ADD: | |
171 | dbg("udev add"); | |
7a947ce5 | 172 | |
7a947ce5 KS |
173 | /* open the device */ |
174 | snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath); | |
175 | class_dev = sysfs_open_class_device_path(path); | |
176 | if (class_dev == NULL) { | |
177 | dbg ("sysfs_open_class_device_path failed"); | |
178 | break; | |
179 | } | |
180 | dbg("opened class_dev->name='%s'", class_dev->name); | |
181 | ||
f0713480 KS |
182 | /* init rules */ |
183 | namedev_init(); | |
184 | ||
7a947ce5 KS |
185 | /* name, create node, store in db */ |
186 | retval = udev_add_device(&udev, class_dev); | |
5d24c6ca KS |
187 | |
188 | /* run scripts */ | |
189 | dev_d_execute(&udev); | |
190 | ||
191 | sysfs_close_class_device(class_dev); | |
aee380b6 KS |
192 | break; |
193 | case REMOVE: | |
194 | dbg("udev remove"); | |
5d24c6ca KS |
195 | |
196 | /* get node from db, delete it*/ | |
7a947ce5 | 197 | retval = udev_remove_device(&udev); |
5d24c6ca KS |
198 | |
199 | /* run scripts */ | |
200 | dev_d_execute(&udev); | |
dbfc520c | 201 | } |
2a94c877 | 202 | |
dbfc520c | 203 | udevdb_exit(); |
85511f02 | 204 | |
7ac0feeb | 205 | exit: |
7257cb18 | 206 | logging_close(); |
f61d732a | 207 | return retval; |
f0083e3d | 208 | } |