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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> |
85511f02 | 31 | |
c80da508 | 32 | #include "libsysfs/sysfs/libsysfs.h" |
f0083e3d | 33 | #include "udev.h" |
c81b35c0 | 34 | #include "udev_lib.h" |
f0083e3d | 35 | #include "udev_version.h" |
54988802 | 36 | #include "logging.h" |
2232cac8 | 37 | #include "namedev.h" |
dbfc520c | 38 | #include "udevdb.h" |
f0083e3d | 39 | |
7e89a569 KS |
40 | /* timeout flag for udevdb */ |
41 | extern sig_atomic_t gotalarm; | |
42 | ||
c056c514 GKH |
43 | /* global variables */ |
44 | char **main_argv; | |
45 | char **main_envp; | |
46 | ||
d026a35d | 47 | #ifdef LOG |
d00bd172 | 48 | unsigned char logname[LOGNAME_SIZE]; |
3fe07342 | 49 | void log_message(int level, const char *format, ...) |
51a8bb2f | 50 | { |
e964c2c0 | 51 | va_list args; |
d026a35d GKH |
52 | |
53 | if (!udev_log) | |
54 | return; | |
55 | ||
56 | va_start(args, format); | |
57 | vsyslog(level, format, args); | |
58 | va_end(args); | |
51a8bb2f | 59 | } |
d026a35d | 60 | #endif |
51a8bb2f | 61 | |
e5a5b54a | 62 | static void asmlinkage sig_handler(int signum) |
d12ecb53 | 63 | { |
d12ecb53 | 64 | switch (signum) { |
7e89a569 KS |
65 | case SIGALRM: |
66 | gotalarm = 1; | |
67 | info("error: timeout reached, event probably not handled correctly"); | |
68 | break; | |
d12ecb53 MB |
69 | case SIGINT: |
70 | case SIGTERM: | |
d12ecb53 MB |
71 | udevdb_exit(); |
72 | exit(20 + signum); | |
d12ecb53 | 73 | default: |
47bf9196 | 74 | dbg("unhandled signal %d", signum); |
d12ecb53 MB |
75 | } |
76 | } | |
77 | ||
707680b1 KS |
78 | /* list of subsystems we don't care about. not listing such systems here |
79 | * is not critical, but it makes it faster as we don't look for the "dev" file | |
80 | */ | |
81 | static int subsystem_without_dev(const char *subsystem) | |
82 | { | |
83 | char *subsystem_blacklist[] = { | |
84 | "scsi_host", | |
85 | "scsi_device", | |
86 | "usb_host", | |
87 | "pci_bus", | |
88 | "pcmcia_socket", | |
89 | "bluetooth", | |
90 | "i2c-adapter", | |
91 | "pci_bus", | |
92 | "ieee1394", | |
93 | "ieee1394_host", | |
94 | "ieee1394_node", | |
95 | NULL | |
96 | }; | |
97 | char **subsys; | |
98 | ||
99 | for (subsys = subsystem_blacklist; *subsys != NULL; subsys++) { | |
100 | if (strcmp(subsystem, *subsys) == 0) | |
101 | return 1; | |
102 | } | |
103 | ||
104 | return 0; | |
105 | } | |
8eb38ef8 | 106 | |
aee380b6 | 107 | int main(int argc, char *argv[], char *envp[]) |
f4dc8d11 | 108 | { |
f8911dbb | 109 | struct sigaction act; |
7a947ce5 KS |
110 | struct sysfs_class_device *class_dev; |
111 | struct udevice udev; | |
112 | char path[SYSFS_PATH_MAX]; | |
aee380b6 KS |
113 | int retval = -EINVAL; |
114 | enum { | |
115 | ADD, | |
116 | REMOVE, | |
117 | UDEVSTART, | |
118 | } act_type; | |
f4dc8d11 | 119 | |
aee380b6 | 120 | dbg("version %s", UDEV_VERSION); |
2232cac8 | 121 | |
92307b9e PM |
122 | main_argv = argv; |
123 | main_envp = envp; | |
124 | ||
7257cb18 | 125 | logging_init("udev"); |
7e89a569 | 126 | |
aee380b6 | 127 | udev_init_config(); |
af815f88 | 128 | |
aee380b6 KS |
129 | if (strstr(argv[0], "udevstart")) { |
130 | act_type = UDEVSTART; | |
131 | } else { | |
7a947ce5 KS |
132 | const char *action = get_action(); |
133 | const char *devpath = get_devpath(); | |
134 | const char *subsystem = get_subsystem(main_argv[1]); | |
135 | ||
aee380b6 KS |
136 | if (!action) { |
137 | dbg("no action?"); | |
138 | goto exit; | |
139 | } | |
140 | if (strcmp(action, "add") == 0) { | |
141 | act_type = ADD; | |
142 | } else if (strcmp(action, "remove") == 0) { | |
143 | act_type = REMOVE; | |
144 | } else { | |
7a947ce5 | 145 | dbg("no action '%s' for us", action); |
8eb38ef8 GKH |
146 | goto exit; |
147 | } | |
f0083e3d | 148 | |
aee380b6 KS |
149 | if (!devpath) { |
150 | dbg("no devpath?"); | |
151 | goto exit; | |
152 | } | |
7a947ce5 | 153 | dbg("looking at '%s'", udev.devpath); |
aee380b6 KS |
154 | |
155 | /* we only care about class devices and block stuff */ | |
6d74f996 | 156 | if (!strstr(devpath, "class") && !strstr(devpath, "block")) { |
aee380b6 KS |
157 | dbg("not a block or class device"); |
158 | goto exit; | |
159 | } | |
160 | ||
aee380b6 | 161 | if (!subsystem) { |
7a947ce5 | 162 | dbg("no subsystem"); |
aee380b6 KS |
163 | goto exit; |
164 | } | |
165 | ||
166 | /* skip blacklisted subsystems */ | |
707680b1 KS |
167 | if (subsystem_without_dev(subsystem)) { |
168 | dbg("don't care about '%s' devices", subsystem); | |
7a947ce5 | 169 | goto exit; |
707680b1 | 170 | }; |
7a947ce5 KS |
171 | |
172 | udev_set_values(&udev, devpath, subsystem); | |
dbfc520c DS |
173 | } |
174 | ||
47bf9196 | 175 | /* set signal handlers */ |
dc117daa | 176 | act.sa_handler = (void (*) (int))sig_handler; |
f8911dbb | 177 | sigemptyset (&act.sa_mask); |
707680b1 | 178 | /* alarm must not restart syscalls*/ |
7e89a569 | 179 | sigaction(SIGALRM, &act, NULL); |
f8911dbb KS |
180 | sigaction(SIGINT, &act, NULL); |
181 | sigaction(SIGTERM, &act, NULL); | |
3fd52a76 | 182 | |
7e89a569 KS |
183 | /* trigger timout to interrupt blocking syscalls */ |
184 | alarm(ALARM_TIMEOUT); | |
185 | ||
aee380b6 | 186 | /* initialize udev database */ |
7e89a569 KS |
187 | if (udevdb_init(UDEVDB_DEFAULT) != 0) |
188 | info("error: unable to initialize database, continuing without database"); | |
f61d732a | 189 | |
aee380b6 KS |
190 | switch(act_type) { |
191 | case UDEVSTART: | |
192 | dbg("udevstart"); | |
193 | namedev_init(); | |
aee380b6 KS |
194 | retval = udev_start(); |
195 | break; | |
196 | case ADD: | |
197 | dbg("udev add"); | |
7a947ce5 KS |
198 | |
199 | /* init rules */ | |
aee380b6 | 200 | namedev_init(); |
7a947ce5 KS |
201 | |
202 | /* open the device */ | |
203 | snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath); | |
204 | class_dev = sysfs_open_class_device_path(path); | |
205 | if (class_dev == NULL) { | |
206 | dbg ("sysfs_open_class_device_path failed"); | |
207 | break; | |
208 | } | |
209 | dbg("opened class_dev->name='%s'", class_dev->name); | |
210 | ||
211 | /* name, create node, store in db */ | |
212 | retval = udev_add_device(&udev, class_dev); | |
5d24c6ca KS |
213 | |
214 | /* run scripts */ | |
215 | dev_d_execute(&udev); | |
216 | ||
217 | sysfs_close_class_device(class_dev); | |
aee380b6 KS |
218 | break; |
219 | case REMOVE: | |
220 | dbg("udev remove"); | |
5d24c6ca KS |
221 | |
222 | /* get node from db, delete it*/ | |
7a947ce5 | 223 | retval = udev_remove_device(&udev); |
5d24c6ca KS |
224 | |
225 | /* run scripts */ | |
226 | dev_d_execute(&udev); | |
dbfc520c | 227 | } |
2a94c877 | 228 | |
dbfc520c | 229 | udevdb_exit(); |
85511f02 | 230 | |
7ac0feeb | 231 | exit: |
7257cb18 | 232 | logging_close(); |
f61d732a | 233 | return retval; |
f0083e3d | 234 | } |