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Commit | Line | Data |
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82b9a637 GKH |
1 | /* |
2 | * udevstart.c | |
3 | * | |
4 | * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com> | |
5 | * | |
6 | * Quick and dirty way to populate a /dev with udev if your system | |
7 | * does not have access to a shell. Based originally on a patch to udev | |
8 | * from Harald Hoyer <harald@redhat.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the | |
12 | * Free Software Foundation version 2 of the License. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <stdlib.h> | |
0e306d08 | 26 | #include <stddef.h> |
82b9a637 GKH |
27 | #include <string.h> |
28 | #include <stdio.h> | |
56a8a624 | 29 | #include <unistd.h> |
82b9a637 GKH |
30 | #include <errno.h> |
31 | #include <ctype.h> | |
82b9a637 | 32 | #include <dirent.h> |
56a8a624 | 33 | #include <signal.h> |
82b9a637 | 34 | #include <sys/wait.h> |
f22e9686 | 35 | #include <sys/stat.h> |
f27125f9 | 36 | #include <sys/types.h> |
82b9a637 | 37 | |
7a947ce5 | 38 | #include "libsysfs/sysfs/libsysfs.h" |
63f61c5c KS |
39 | #include "udev_libc_wrapper.h" |
40 | #include "udev.h" | |
82b9a637 | 41 | #include "logging.h" |
e5e322bc | 42 | #include "udev_rules.h" |
9af5bb2f | 43 | #include "udev_utils.h" |
0e306d08 | 44 | #include "list.h" |
82b9a637 | 45 | |
56a8a624 KS |
46 | #ifdef USE_LOG |
47 | void log_message(int level, const char *format, ...) | |
48 | { | |
49 | } | |
50 | #endif | |
82b9a637 | 51 | |
0e306d08 | 52 | struct device { |
47241986 | 53 | struct list_head node; |
63f61c5c KS |
54 | char path[PATH_SIZE]; |
55 | char subsys[NAME_SIZE]; | |
0e306d08 GKH |
56 | }; |
57 | ||
58 | /* sort files in lexical order */ | |
f22e9686 | 59 | static int device_list_insert(const char *path, char *subsystem, struct list_head *device_list) |
0e306d08 GKH |
60 | { |
61 | struct device *loop_device; | |
62 | struct device *new_device; | |
63 | ||
f22e9686 KS |
64 | dbg("insert: '%s'\n", path); |
65 | ||
47241986 | 66 | list_for_each_entry(loop_device, device_list, node) { |
0e306d08 GKH |
67 | if (strcmp(loop_device->path, path) > 0) { |
68 | break; | |
69 | } | |
70 | } | |
71 | ||
72 | new_device = malloc(sizeof(struct device)); | |
73 | if (new_device == NULL) { | |
74 | dbg("error malloc"); | |
75 | return -ENOMEM; | |
76 | } | |
77 | ||
63f61c5c KS |
78 | strlcpy(new_device->path, path, sizeof(new_device->path)); |
79 | strlcpy(new_device->subsys, subsystem, sizeof(new_device->subsys)); | |
47241986 | 80 | list_add_tail(&new_device->node, &loop_device->node); |
aee380b6 | 81 | dbg("add '%s' from subsys '%s'", new_device->path, new_device->subsys); |
0e306d08 GKH |
82 | return 0; |
83 | } | |
84 | ||
0e306d08 GKH |
85 | /* list of devices that we should run last due to any one of a number of reasons */ |
86 | static char *last_list[] = { | |
87 | "/block/dm", /* on here because dm wants to have the block devices around before it */ | |
88 | NULL, | |
89 | }; | |
90 | ||
70f630f6 GKH |
91 | /* list of devices that we should run first due to any one of a number of reasons */ |
92 | static char *first_list[] = { | |
93 | "/class/mem", /* people tend to like their memory devices around first... */ | |
94 | NULL, | |
95 | }; | |
96 | ||
f22e9686 | 97 | static int add_device(const char *path, const char *subsystem) |
f608f8ac | 98 | { |
7a947ce5 | 99 | struct udevice udev; |
7a947ce5 | 100 | struct sysfs_class_device *class_dev; |
f22e9686 KS |
101 | const char *devpath; |
102 | ||
103 | devpath = &path[strlen(sysfs_path)]; | |
f608f8ac | 104 | |
af4b05d4 | 105 | /* set environment for callouts and dev.d/ */ |
7a947ce5 | 106 | setenv("DEVPATH", devpath, 1); |
af4b05d4 | 107 | setenv("SUBSYSTEM", subsystem, 1); |
7a947ce5 | 108 | |
56a8a624 | 109 | dbg("exec: '%s' (%s)\n", devpath, path); |
f22e9686 | 110 | |
7a947ce5 KS |
111 | class_dev = sysfs_open_class_device_path(path); |
112 | if (class_dev == NULL) { | |
113 | dbg ("sysfs_open_class_device_path failed"); | |
114 | return -ENODEV; | |
115 | } | |
116 | ||
45a7b668 | 117 | udev_init_device(&udev, devpath, subsystem); |
5d24c6ca | 118 | udev_add_device(&udev, class_dev); |
7a947ce5 | 119 | |
8673dcb8 | 120 | /* run dev.d/ scripts if we created a node or changed a netif name */ |
7757db1f | 121 | if (udev_dev_d && udev.devname[0] != '\0') { |
8673dcb8 | 122 | setenv("DEVNAME", udev.devname, 1); |
9af5bb2f | 123 | udev_multiplex_directory(&udev, DEVD_DIR, DEVD_SUFFIX); |
8673dcb8 | 124 | } |
5d24c6ca KS |
125 | |
126 | sysfs_close_class_device(class_dev); | |
56a8a624 | 127 | udev_cleanup_device(&udev); |
5d24c6ca KS |
128 | |
129 | return 0; | |
f608f8ac KS |
130 | } |
131 | ||
0e306d08 GKH |
132 | static void exec_list(struct list_head *device_list) |
133 | { | |
134 | struct device *loop_device; | |
135 | struct device *tmp_device; | |
70f630f6 GKH |
136 | int i; |
137 | ||
138 | /* handle the "first" type devices first */ | |
47241986 | 139 | list_for_each_entry_safe(loop_device, tmp_device, device_list, node) { |
f22e9686 | 140 | for (i = 0; first_list[i] != NULL; i++) { |
70f630f6 | 141 | if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) { |
7a947ce5 | 142 | add_device(loop_device->path, loop_device->subsys); |
47241986 | 143 | list_del(&loop_device->node); |
70f630f6 GKH |
144 | free(loop_device); |
145 | break; | |
146 | } | |
147 | } | |
148 | } | |
0e306d08 GKH |
149 | |
150 | /* handle the devices we are allowed to, excluding the "last" type devices */ | |
47241986 | 151 | list_for_each_entry_safe(loop_device, tmp_device, device_list, node) { |
0e306d08 | 152 | int found = 0; |
f22e9686 | 153 | for (i = 0; last_list[i] != NULL; i++) { |
0e306d08 GKH |
154 | if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) { |
155 | found = 1; | |
156 | break; | |
157 | } | |
158 | } | |
159 | if (found) | |
160 | continue; | |
161 | ||
7a947ce5 | 162 | add_device(loop_device->path, loop_device->subsys); |
47241986 | 163 | list_del(&loop_device->node); |
0e306d08 GKH |
164 | free(loop_device); |
165 | } | |
166 | ||
167 | /* handle the rest of the devices left over, if any */ | |
47241986 | 168 | list_for_each_entry_safe(loop_device, tmp_device, device_list, node) { |
7a947ce5 | 169 | add_device(loop_device->path, loop_device->subsys); |
47241986 | 170 | list_del(&loop_device->node); |
0e306d08 GKH |
171 | free(loop_device); |
172 | } | |
173 | } | |
174 | ||
f22e9686 KS |
175 | static int has_devt(const char *directory) |
176 | { | |
63f61c5c | 177 | char filename[PATH_SIZE]; |
f22e9686 KS |
178 | struct stat statbuf; |
179 | ||
63f61c5c KS |
180 | snprintf(filename, sizeof(filename), "%s/dev", directory); |
181 | filename[sizeof(filename)-1] = '\0'; | |
f22e9686 KS |
182 | |
183 | if (stat(filename, &statbuf) == 0) | |
184 | return 1; | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
0e306d08 | 189 | static void udev_scan_block(void) |
82b9a637 | 190 | { |
63f61c5c | 191 | char base[PATH_SIZE]; |
e4dc0e11 KS |
192 | DIR *dir; |
193 | struct dirent *dent; | |
0e306d08 | 194 | LIST_HEAD(device_list); |
82b9a637 | 195 | |
63f61c5c KS |
196 | snprintf(base, sizeof(base), "%s/block", sysfs_path); |
197 | base[sizeof(base)-1] = '\0'; | |
f22e9686 KS |
198 | |
199 | dir = opendir(base); | |
e4dc0e11 KS |
200 | if (dir != NULL) { |
201 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { | |
63f61c5c | 202 | char dirname[PATH_SIZE]; |
e4dc0e11 KS |
203 | DIR *dir2; |
204 | struct dirent *dent2; | |
205 | ||
f22e9686 | 206 | if (dent->d_name[0] == '.') |
82b9a637 GKH |
207 | continue; |
208 | ||
63f61c5c KS |
209 | snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name); |
210 | dirname[sizeof(dirname)-1] = '\0'; | |
f22e9686 KS |
211 | if (has_devt(dirname)) |
212 | device_list_insert(dirname, "block", &device_list); | |
213 | else | |
214 | continue; | |
0e306d08 | 215 | |
56a8a624 | 216 | /* look for partitions */ |
82b9a637 | 217 | dir2 = opendir(dirname); |
e4dc0e11 KS |
218 | if (dir2 != NULL) { |
219 | for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { | |
63f61c5c | 220 | char dirname2[PATH_SIZE]; |
82b9a637 | 221 | |
f22e9686 | 222 | if (dent2->d_name[0] == '.') |
82b9a637 GKH |
223 | continue; |
224 | ||
63f61c5c KS |
225 | snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name); |
226 | dirname2[sizeof(dirname2)-1] = '\0'; | |
f22e9686 KS |
227 | |
228 | if (has_devt(dirname2)) | |
229 | device_list_insert(dirname2, "block", &device_list); | |
82b9a637 | 230 | } |
e13fa599 | 231 | closedir(dir2); |
82b9a637 GKH |
232 | } |
233 | } | |
e13fa599 | 234 | closedir(dir); |
82b9a637 | 235 | } |
0e306d08 GKH |
236 | exec_list(&device_list); |
237 | } | |
238 | ||
239 | static void udev_scan_class(void) | |
240 | { | |
63f61c5c | 241 | char base[PATH_SIZE]; |
0e306d08 GKH |
242 | DIR *dir; |
243 | struct dirent *dent; | |
244 | LIST_HEAD(device_list); | |
245 | ||
63f61c5c KS |
246 | snprintf(base, sizeof(base), "%s/class", sysfs_path); |
247 | base[sizeof(base)-1] = '\0'; | |
f22e9686 KS |
248 | |
249 | dir = opendir(base); | |
e4dc0e11 KS |
250 | if (dir != NULL) { |
251 | for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { | |
63f61c5c | 252 | char dirname[PATH_SIZE]; |
e4dc0e11 KS |
253 | DIR *dir2; |
254 | struct dirent *dent2; | |
255 | ||
f22e9686 | 256 | if (dent->d_name[0] == '.') |
82b9a637 GKH |
257 | continue; |
258 | ||
63f61c5c KS |
259 | snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name); |
260 | dirname[sizeof(dirname)-1] = '\0'; | |
56a8a624 | 261 | |
82b9a637 | 262 | dir2 = opendir(dirname); |
e4dc0e11 KS |
263 | if (dir2 != NULL) { |
264 | for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { | |
63f61c5c | 265 | char dirname2[PATH_SIZE]; |
82b9a637 | 266 | |
f22e9686 | 267 | if (dent2->d_name[0] == '.') |
82b9a637 GKH |
268 | continue; |
269 | ||
63f61c5c KS |
270 | snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name); |
271 | dirname2[sizeof(dirname2)-1] = '\0'; | |
f22e9686 | 272 | |
aee380b6 | 273 | /* pass the net class as it is */ |
f22e9686 | 274 | if (strcmp(dent->d_name, "net") == 0) |
aee380b6 | 275 | device_list_insert(dirname2, "net", &device_list); |
f22e9686 KS |
276 | else if (has_devt(dirname2)) |
277 | device_list_insert(dirname2, dent->d_name, &device_list); | |
82b9a637 | 278 | } |
e13fa599 | 279 | closedir(dir2); |
82b9a637 GKH |
280 | } |
281 | } | |
e13fa599 | 282 | closedir(dir); |
82b9a637 | 283 | } |
0e306d08 | 284 | exec_list(&device_list); |
82b9a637 GKH |
285 | } |
286 | ||
56a8a624 | 287 | static void asmlinkage sig_handler(int signum) |
82b9a637 | 288 | { |
56a8a624 KS |
289 | switch (signum) { |
290 | case SIGALRM: | |
291 | exit(1); | |
292 | case SIGINT: | |
293 | case SIGTERM: | |
294 | exit(20 + signum); | |
295 | } | |
296 | } | |
297 | ||
298 | int main(int argc, char *argv[], char *envp[]) | |
299 | { | |
300 | struct sigaction act; | |
301 | ||
302 | udev_init_config(); | |
303 | ||
304 | /* set signal handlers */ | |
305 | memset(&act, 0x00, sizeof(act)); | |
306 | act.sa_handler = (void (*) (int))sig_handler; | |
307 | sigemptyset (&act.sa_mask); | |
308 | act.sa_flags = 0; | |
309 | sigaction(SIGALRM, &act, NULL); | |
310 | sigaction(SIGINT, &act, NULL); | |
311 | sigaction(SIGTERM, &act, NULL); | |
312 | ||
313 | /* trigger timeout to prevent hanging processes */ | |
314 | alarm(ALARM_TIMEOUT); | |
315 | ||
316 | /* set environment for executed programs */ | |
af4b05d4 | 317 | setenv("ACTION", "add", 1); |
69d2dbd6 | 318 | setenv("UDEV_START", "1", 1); |
af4b05d4 | 319 | |
e5e322bc | 320 | udev_rules_init(); |
56a8a624 | 321 | |
0e306d08 | 322 | udev_scan_block(); |
56a8a624 | 323 | udev_scan_class(); |
af4b05d4 | 324 | |
3f20eac0 | 325 | return 0; |
82b9a637 | 326 | } |