chiark / gitweb /
more fixups
[elogind.git] / udev_start.c
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>
26 #include <stddef.h>
27 #include <string.h>
28 #include <stdio.h>
29 #include <errno.h>
30 #include <ctype.h>
31 #include <dirent.h>
32 #include <sys/wait.h>
33 #include <sys/types.h>
34 #include <unistd.h>
35
36 #include "libsysfs/sysfs/libsysfs.h"
37 #include "logging.h"
38 #include "udev_utils.h"
39 #include "list.h"
40 #include "udev.h"
41
42
43 #define MAX_PATHLEN             1024
44 #define SYSBLOCK                "/sys/block"
45 #define SYSCLASS                "/sys/class"
46
47 struct device {
48         struct list_head list;
49         char path[MAX_PATHLEN];
50         char subsys[MAX_PATHLEN];
51 };
52
53 /* sort files in lexical order */
54 static int device_list_insert(char *path, char *subsystem, struct list_head *device_list)
55 {
56         struct device *loop_device;
57         struct device *new_device;
58
59         list_for_each_entry(loop_device, device_list, list) {
60                 if (strcmp(loop_device->path, path) > 0) {
61                         break;
62                 }
63         }
64
65         new_device = malloc(sizeof(struct device));
66         if (new_device == NULL) {
67                 dbg("error malloc");
68                 return -ENOMEM;
69         }
70
71         strfieldcpy(new_device->path, path);
72         strfieldcpy(new_device->subsys, subsystem);
73         list_add_tail(&new_device->list, &loop_device->list);
74         dbg("add '%s' from subsys '%s'", new_device->path, new_device->subsys);
75         return 0;
76 }
77
78 /* list of devices that we should run last due to any one of a number of reasons */
79 static char *last_list[] = {
80         "/block/dm",    /* on here because dm wants to have the block devices around before it */
81         NULL,
82 };
83
84 /* list of devices that we should run first due to any one of a number of reasons */
85 static char *first_list[] = {
86         "/class/mem",   /* people tend to like their memory devices around first... */
87         NULL,
88 };
89
90 static int add_device(char *devpath, char *subsystem)
91 {
92         struct udevice udev;
93         char path[SYSFS_PATH_MAX];
94         struct sysfs_class_device *class_dev;
95
96         /* set environment for callouts and dev.d/ */
97         setenv("DEVPATH", devpath, 1);
98         setenv("SUBSYSTEM", subsystem, 1);
99
100         snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, devpath);
101         path[SYSFS_PATH_MAX-1] = '\0';
102         class_dev = sysfs_open_class_device_path(path);
103         if (class_dev == NULL) {
104                 dbg ("sysfs_open_class_device_path failed");
105                 return -ENODEV;
106         }
107
108         udev_set_values(&udev, devpath, subsystem, "add");
109         udev_add_device(&udev, class_dev);
110
111         /* run dev.d/ scripts if we created a node or changed a netif name */
112         if (udev_dev_d && udev.devname[0] != '\0') {
113                 setenv("DEVNAME", udev.devname, 1);
114                 udev_multiplex_directory(&udev, DEVD_DIR, DEVD_SUFFIX);
115         }
116
117         sysfs_close_class_device(class_dev);
118
119         return 0;
120 }
121
122 static void exec_list(struct list_head *device_list)
123 {
124         struct device *loop_device;
125         struct device *tmp_device;
126         int i;
127
128         /* handle the "first" type devices first */
129         list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
130                 for (i=0; first_list[i] != NULL; i++) {
131                         if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
132                                 add_device(loop_device->path, loop_device->subsys);
133                                 list_del(&loop_device->list);
134                                 free(loop_device);
135                                 break;
136                         }
137                 }
138         }
139
140         /* handle the devices we are allowed to, excluding the "last" type devices */
141         list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
142                 int found = 0;
143                 for (i=0; last_list[i] != NULL; i++) {
144                         if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
145                                 found = 1;
146                                 break;
147                         }
148                 }
149                 if (found)
150                         continue;
151
152                 add_device(loop_device->path, loop_device->subsys);
153                 list_del(&loop_device->list);
154                 free(loop_device);
155         }
156
157         /* handle the rest of the devices left over, if any */
158         list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
159                 add_device(loop_device->path, loop_device->subsys);
160                 list_del(&loop_device->list);
161                 free(loop_device);
162         }
163 }
164
165 static void udev_scan_block(void)
166 {
167         DIR *dir;
168         struct dirent *dent;
169         LIST_HEAD(device_list);
170
171         dir = opendir(SYSBLOCK);
172         if (dir != NULL) {
173                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
174                         char dirname[MAX_PATHLEN];
175                         DIR *dir2;
176                         struct dirent *dent2;
177
178                         if ((strcmp(dent->d_name, ".") == 0) ||
179                             (strcmp(dent->d_name, "..") == 0))
180                                 continue;
181
182                         snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
183                         dirname[MAX_PATHLEN-1] = '\0';
184                         device_list_insert(dirname, "block", &device_list);
185
186                         snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
187                         dir2 = opendir(dirname);
188                         if (dir2 != NULL) {
189                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
190                                         char dirname2[MAX_PATHLEN];
191                                         DIR *dir3;
192                                         struct dirent *dent3;
193
194                                         if ((strcmp(dent2->d_name, ".") == 0) ||
195                                             (strcmp(dent2->d_name, "..") == 0))
196                                                 continue;
197
198                                         snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
199                                         dirname2[MAX_PATHLEN-1] = '\0';
200
201                                         dir3 = opendir(dirname2);
202                                         if (dir3 != NULL) {
203                                                 for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
204                                                         char filename[MAX_PATHLEN];
205
206                                                         if (strcmp(dent3->d_name, "dev") == 0) {
207                                                                 snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
208                                                                          dent->d_name, dent2->d_name);
209                                                                 filename[MAX_PATHLEN-1] = '\0';
210                                                                 device_list_insert(filename, "block", &device_list);
211                                                         }
212                                                 }
213                                                 closedir(dir3);
214                                         }
215                                 }
216                                 closedir(dir2);
217                         }
218                 }
219                 closedir(dir);
220         }
221
222         exec_list(&device_list);
223 }
224
225 static void udev_scan_class(void)
226 {
227         DIR *dir;
228         struct dirent *dent;
229         LIST_HEAD(device_list);
230
231         dir = opendir(SYSCLASS);
232         if (dir != NULL) {
233                 for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
234                         char dirname[MAX_PATHLEN];
235                         DIR *dir2;
236                         struct dirent *dent2;
237
238                         if ((strcmp(dent->d_name, ".") == 0) ||
239                             (strcmp(dent->d_name, "..") == 0))
240                                 continue;
241
242                         snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
243                         dirname[MAX_PATHLEN-1] = '\0';
244                         dir2 = opendir(dirname);
245                         if (dir2 != NULL) {
246                                 for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
247                                         char dirname2[MAX_PATHLEN];
248                                         DIR *dir3;
249                                         struct dirent *dent3;
250
251                                         if ((strcmp(dent2->d_name, ".") == 0) ||
252                                             (strcmp(dent2->d_name, "..") == 0))
253                                                 continue;
254
255                                         /* pass the net class as it is */
256                                         if (strcmp(dent->d_name, "net") == 0) {
257                                                 snprintf(dirname2, MAX_PATHLEN, "/class/net/%s", dent2->d_name);
258                                                 device_list_insert(dirname2, "net", &device_list);
259                                                 continue;
260                                         }
261
262                                         snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
263                                         dirname2[MAX_PATHLEN-1] = '\0';
264                                         dir3 = opendir(dirname2);
265                                         if (dir3 != NULL) {
266                                                 for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
267                                                         char filename[MAX_PATHLEN];
268
269                                                         /* pass devices with a "dev" file */
270                                                         if (strcmp(dent3->d_name, "dev") == 0) {
271                                                                 snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
272                                                                          dent->d_name, dent2->d_name);
273                                                                 filename[MAX_PATHLEN-1] = '\0';
274                                                                 device_list_insert(filename, dent->d_name, &device_list);
275                                                                 break;
276                                                         }
277                                                 }
278                                                 closedir(dir3);
279                                         }
280                                 }
281                                 closedir(dir2);
282                         }
283                 }
284                 closedir(dir);
285         }
286
287         exec_list(&device_list);
288 }
289
290 int udev_start(void)
291 {
292         /* set environment for callouts and dev.d/ */
293         setenv("ACTION", "add", 1);
294         setenv("UDEV_START", "1", 1);
295
296         udev_scan_class();
297         udev_scan_block();
298
299         return 0;
300 }