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ea733a2f GKH |
1 | /* |
2 | * udev-add.c | |
3 | * | |
4 | * Userspace devfs | |
5 | * | |
6 | * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> | |
7 | * | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation version 2 of the License. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <stdio.h> | |
27 | #include <fcntl.h> | |
28 | #include <unistd.h> | |
29 | #include <errno.h> | |
32ff5bca | 30 | #include <sys/stat.h> |
10950dfe GKH |
31 | #include <sys/types.h> |
32 | #include <grp.h> | |
33 | #ifndef __KLIBC__ | |
34 | #include <pwd.h> | |
35 | #endif | |
ea733a2f GKH |
36 | |
37 | #include "udev.h" | |
38 | #include "udev_version.h" | |
39 | #include "namedev.h" | |
8e41d35d | 40 | #include "udevdb.h" |
ea733a2f | 41 | #include "libsysfs/libsysfs.h" |
10950dfe | 42 | #include "klibc_fixups.h" |
ea733a2f | 43 | |
ea733a2f GKH |
44 | /* |
45 | * Right now the major/minor of a device is stored in a file called | |
46 | * "dev" in sysfs. | |
47 | * The number is stored as: | |
727d1ba5 | 48 | * MM:mm |
ea733a2f GKH |
49 | * MM is the major |
50 | * mm is the minor | |
727d1ba5 | 51 | * The value is in decimal. |
ea733a2f | 52 | */ |
30defadd | 53 | static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev) |
ea733a2f | 54 | { |
ea256f90 | 55 | int retval = -ENODEV; |
ea733a2f GKH |
56 | |
57 | char *dev; | |
58 | ||
59 | dev = sysfs_get_value_from_attributes(class_dev->directory->attributes, "dev"); | |
60 | if (dev == NULL) | |
ea256f90 | 61 | goto exit; |
ea733a2f | 62 | |
f7b4eca4 | 63 | dbg("dev='%s'", dev); |
ea733a2f | 64 | |
30defadd | 65 | if (sscanf(dev, "%u:%u", &udev->major, &udev->minor) != 2) |
ea256f90 | 66 | goto exit; |
ea733a2f | 67 | |
f7b4eca4 | 68 | dbg("found major=%d, minor=%d", udev->major, udev->minor); |
ea733a2f GKH |
69 | |
70 | retval = 0; | |
ea256f90 | 71 | exit: |
ea733a2f GKH |
72 | return retval; |
73 | } | |
74 | ||
75 | /* | |
c19a6b30 KS |
76 | * we possibly want to add some symlinks here |
77 | * only numeric owner/group id's are supported | |
ea733a2f | 78 | */ |
5840bc63 | 79 | static int create_node(struct udevice *dev) |
ea733a2f | 80 | { |
ea733a2f GKH |
81 | char filename[255]; |
82 | int retval = 0; | |
e308ebb7 GKH |
83 | uid_t uid = 0; |
84 | gid_t gid = 0; | |
1e959a4b | 85 | dev_t res; |
5840bc63 | 86 | |
c056c514 | 87 | strncpy(filename, udev_root, sizeof(filename)); |
5840bc63 GKH |
88 | strncat(filename, dev->name, sizeof(filename)); |
89 | ||
1e959a4b GKH |
90 | #ifdef __KLIBC__ |
91 | res = (dev->major << 8) | (dev->minor); | |
92 | #else | |
93 | res = makedev(dev->major, dev->minor); | |
94 | #endif | |
95 | ||
5840bc63 | 96 | switch (dev->type) { |
1331c889 | 97 | case 'b': |
5840bc63 | 98 | dev->mode |= S_IFBLK; |
1331c889 GKH |
99 | break; |
100 | case 'c': | |
101 | case 'u': | |
5840bc63 | 102 | dev->mode |= S_IFCHR; |
1331c889 GKH |
103 | break; |
104 | case 'p': | |
5840bc63 | 105 | dev->mode |= S_IFIFO; |
1331c889 GKH |
106 | break; |
107 | default: | |
5840bc63 | 108 | dbg("unknown node type %c\n", dev->type); |
1331c889 GKH |
109 | return -EINVAL; |
110 | } | |
0abf54fc | 111 | |
218eae87 KS |
112 | /* create subdirectories if requested */ |
113 | if (strchr(dev->name, '/')) { | |
114 | char path[255]; | |
115 | char *pos; | |
116 | struct stat stats; | |
117 | ||
118 | strncpy(path, filename, sizeof(path)); | |
119 | pos = strchr(path+1, '/'); | |
120 | while (1) { | |
121 | pos = strchr(pos+1, '/'); | |
122 | if (pos == NULL) | |
123 | break; | |
124 | *pos = 0x00; | |
125 | if (stat(path, &stats)) { | |
126 | retval = mkdir(path, 0755); | |
127 | if (retval) { | |
128 | dbg("mkdir(%s) failed with error '%s'", | |
129 | path, strerror(errno)); | |
130 | return retval; | |
131 | } | |
f7b4eca4 | 132 | dbg("created '%s'", path); |
218eae87 KS |
133 | } |
134 | *pos = '/'; | |
135 | } | |
136 | } | |
137 | ||
5840bc63 | 138 | dbg("mknod(%s, %#o, %u, %u)", filename, dev->mode, dev->major, dev->minor); |
1e959a4b | 139 | retval = mknod(filename, dev->mode, res); |
1331c889 GKH |
140 | if (retval) |
141 | dbg("mknod(%s, %#o, %u, %u) failed with error '%s'", | |
5840bc63 GKH |
142 | filename, dev->mode, dev->major, dev->minor, strerror(errno)); |
143 | ||
5bd1061c GKH |
144 | dbg("chmod(%s, %#o)", filename, dev->mode); |
145 | retval = chmod(filename, dev->mode); | |
146 | if (retval) | |
147 | dbg("chmod(%s, %#o) failed with error '%s'", | |
148 | filename, dev->mode, strerror(errno)); | |
149 | ||
c19a6b30 KS |
150 | if (*dev->owner) { |
151 | char *endptr; | |
152 | unsigned long id = strtoul(dev->owner, &endptr, 10); | |
153 | if (*endptr == 0x00) | |
154 | uid = (uid_t) id; | |
10950dfe GKH |
155 | else { |
156 | struct passwd *pw = getpwnam(dev->owner); | |
157 | if (!pw) | |
f7b4eca4 | 158 | dbg("user unknown '%s'", dev->owner); |
10950dfe GKH |
159 | else |
160 | uid = pw->pw_uid; | |
161 | } | |
c19a6b30 KS |
162 | } |
163 | ||
164 | if (*dev->group) { | |
165 | char *endptr; | |
166 | unsigned long id = strtoul(dev->group, &endptr, 10); | |
167 | if (*endptr == 0x00) | |
168 | gid = (gid_t) id; | |
10950dfe GKH |
169 | else { |
170 | struct group *gr = getgrnam(dev->group); | |
171 | if (!gr) | |
f7b4eca4 | 172 | dbg("group unknown '%s'", dev->group); |
10950dfe GKH |
173 | else |
174 | gid = gr->gr_gid; | |
175 | } | |
c19a6b30 KS |
176 | } |
177 | ||
178 | if (uid || gid) { | |
179 | dbg("chown(%s, %u, %u)", filename, uid, gid); | |
180 | retval = chown(filename, uid, gid); | |
181 | if (retval) | |
182 | dbg("chown(%s, %u, %u) failed with error '%s'", filename, | |
183 | uid, gid, strerror(errno)); | |
184 | } | |
185 | ||
ea733a2f GKH |
186 | return retval; |
187 | } | |
188 | ||
d7e954a4 | 189 | static struct sysfs_class_device *get_class_dev(char *device_name) |
ea733a2f GKH |
190 | { |
191 | char dev_path[SYSFS_PATH_MAX]; | |
63dde9f8 GKH |
192 | struct sysfs_class_device *class_dev = NULL; |
193 | ||
ea733a2f GKH |
194 | strcpy(dev_path, sysfs_path); |
195 | strcat(dev_path, device_name); | |
196 | ||
f7b4eca4 | 197 | dbg("looking at '%s'", dev_path); |
ea733a2f GKH |
198 | |
199 | /* open up the sysfs class device for this thing... */ | |
200 | class_dev = sysfs_open_class_device(dev_path); | |
201 | if (class_dev == NULL) { | |
202 | dbg ("sysfs_open_class_device failed"); | |
63dde9f8 | 203 | goto exit; |
ea733a2f | 204 | } |
f7b4eca4 | 205 | dbg("class_dev->name='%s'", class_dev->name); |
ea733a2f | 206 | |
63dde9f8 | 207 | exit: |
ea733a2f GKH |
208 | return class_dev; |
209 | } | |
210 | ||
29fd7e67 GKH |
211 | /* wait for the "dev" file to show up in the directory in sysfs. |
212 | * If it doesn't happen in about 10 seconds, give up. | |
213 | */ | |
214 | #define SECONDS_TO_WAIT_FOR_DEV 10 | |
6089318c | 215 | static int sleep_for_dev(char *path) |
29fd7e67 GKH |
216 | { |
217 | char filename[SYSFS_PATH_MAX + 6]; | |
c332cfc7 RL |
218 | int loop = SECONDS_TO_WAIT_FOR_DEV; |
219 | int retval; | |
29fd7e67 GKH |
220 | |
221 | strcpy(filename, sysfs_path); | |
5840bc63 | 222 | strcat(filename, path); |
29fd7e67 GKH |
223 | strcat(filename, "/dev"); |
224 | ||
c332cfc7 RL |
225 | while (loop--) { |
226 | struct stat buf; | |
227 | ||
f7b4eca4 | 228 | dbg("looking for '%s'", filename); |
29fd7e67 | 229 | retval = stat(filename, &buf); |
c332cfc7 | 230 | if (!retval) |
29fd7e67 | 231 | goto exit; |
29fd7e67 | 232 | |
f7b4eca4 | 233 | /* sleep to give the kernel a chance to create the dev file */ |
29fd7e67 GKH |
234 | sleep(1); |
235 | } | |
236 | retval = -ENODEV; | |
237 | exit: | |
238 | return retval; | |
239 | } | |
240 | ||
5840bc63 | 241 | int udev_add_device(char *path, char *subsystem) |
ea733a2f | 242 | { |
30defadd | 243 | struct sysfs_class_device *class_dev = NULL; |
5840bc63 | 244 | struct udevice dev; |
ea733a2f GKH |
245 | int retval = -EINVAL; |
246 | ||
f3b04a2e GKH |
247 | memset(&dev, 0x00, sizeof(dev)); |
248 | ||
ea733a2f GKH |
249 | /* for now, the block layer is the only place where block devices are */ |
250 | if (strcmp(subsystem, "block") == 0) | |
5840bc63 | 251 | dev.type = 'b'; |
ea733a2f | 252 | else |
5840bc63 | 253 | dev.type = 'c'; |
ea733a2f | 254 | |
5840bc63 | 255 | retval = sleep_for_dev(path); |
29fd7e67 GKH |
256 | if (retval) |
257 | goto exit; | |
63dde9f8 | 258 | |
5840bc63 | 259 | class_dev = get_class_dev(path); |
ea733a2f GKH |
260 | if (class_dev == NULL) |
261 | goto exit; | |
262 | ||
30defadd | 263 | retval = get_major_minor(class_dev, &dev); |
ea733a2f | 264 | if (retval) { |
ca999860 | 265 | dbg("get_major_minor failed"); |
ea733a2f GKH |
266 | goto exit; |
267 | } | |
268 | ||
30defadd GKH |
269 | retval = namedev_name_device(class_dev, &dev); |
270 | if (retval) | |
271 | goto exit; | |
272 | ||
5840bc63 | 273 | retval = udevdb_add_dev(path, &dev); |
8e41d35d | 274 | if (retval != 0) |
5840bc63 | 275 | dbg("udevdb_add_dev failed, but we are going to try to create the node anyway. " |
ca999860 GKH |
276 | "But remove might not work properly for this device."); |
277 | ||
f7b4eca4 | 278 | dbg("name='%s'", dev.name); |
5840bc63 | 279 | retval = create_node(&dev); |
ea733a2f GKH |
280 | |
281 | exit: | |
30defadd GKH |
282 | if (class_dev) |
283 | sysfs_close_class_device(class_dev); | |
284 | ||
ea733a2f GKH |
285 | return retval; |
286 | } |