6 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
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.
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.
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.
31 #include <sys/types.h>
38 #include "udev_version.h"
39 #include "udev_dbus.h"
42 #include "libsysfs/libsysfs.h"
43 #include "klibc_fixups.h"
46 * Right now the major/minor of a device is stored in a file called
48 * The number is stored as:
52 * The value is in decimal.
54 static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
60 dev = sysfs_get_value_from_attributes(class_dev->directory->attributes, "dev");
66 if (sscanf(dev, "%u:%u", &udev->major, &udev->minor) != 2)
69 dbg("found major=%d, minor=%d", udev->major, udev->minor);
76 static int create_path(char *file)
83 strncpy(p, file, sizeof(p));
84 pos = strchr(p+1, '/');
86 pos = strchr(pos+1, '/');
90 if (stat(p, &stats)) {
91 retval = mkdir(p, 0755);
93 dbg("mkdir(%s) failed with error '%s'",
97 dbg("created '%s'", p);
105 * we possibly want to add some symlinks here
106 * only numeric owner/group id's are supported
108 static int create_node(struct udevice *dev)
111 char linktarget[255];
120 strncpy(filename, udev_root, sizeof(filename));
121 strncat(filename, dev->name, sizeof(filename));
124 res = (dev->major << 8) | (dev->minor);
126 res = makedev(dev->major, dev->minor);
131 dev->mode |= S_IFBLK;
135 dev->mode |= S_IFCHR;
138 dev->mode |= S_IFIFO;
141 dbg("unknown node type %c\n", dev->type);
145 /* create parent directories if needed */
146 if (strrchr(dev->name, '/'))
147 create_path(filename);
149 dbg("mknod(%s, %#o, %u, %u)", filename, dev->mode, dev->major, dev->minor);
150 retval = mknod(filename, dev->mode, res);
152 dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
153 filename, dev->mode, dev->major, dev->minor, strerror(errno));
155 dbg("chmod(%s, %#o)", filename, dev->mode);
156 retval = chmod(filename, dev->mode);
158 dbg("chmod(%s, %#o) failed with error '%s'",
159 filename, dev->mode, strerror(errno));
163 unsigned long id = strtoul(dev->owner, &endptr, 10);
167 struct passwd *pw = getpwnam(dev->owner);
169 dbg("user unknown '%s'", dev->owner);
177 unsigned long id = strtoul(dev->group, &endptr, 10);
181 struct group *gr = getgrnam(dev->group);
183 dbg("group unknown '%s'", dev->group);
190 dbg("chown(%s, %u, %u)", filename, uid, gid);
191 retval = chown(filename, uid, gid);
193 dbg("chown(%s, %u, %u) failed with error '%s'",
194 filename, uid, gid, strerror(errno));
198 /* create symlink if requested */
200 strncpy(filename, udev_root, sizeof(filename));
201 strncat(filename, dev->symlink, sizeof(filename));
202 dbg("symlink '%s' to node '%s' requested", filename, dev->name);
203 if (strrchr(dev->symlink, '/'))
204 create_path(filename);
206 /* optimize relative link */
207 linktarget[0] = '\0';
210 while ((dev->name[i] == dev->symlink[i]) && dev->name[i]) {
211 if (dev->name[i] == '/')
215 while (dev->symlink[i]) {
216 if (dev->symlink[i] == '/')
217 strcat(linktarget, "../");
221 if (*linktarget == '\0')
222 strcpy(linktarget, "./");
223 strcat(linktarget, &dev->name[tail]);
225 dbg("symlink(%s, %s)", linktarget, filename);
226 retval = symlink(linktarget, filename);
228 dbg("symlink(%s, %s) failed with error '%s'",
229 linktarget, filename, strerror(errno));
235 static struct sysfs_class_device *get_class_dev(char *device_name)
237 char dev_path[SYSFS_PATH_MAX];
238 struct sysfs_class_device *class_dev = NULL;
240 strcpy(dev_path, sysfs_path);
241 strcat(dev_path, device_name);
243 dbg("looking at '%s'", dev_path);
245 /* open up the sysfs class device for this thing... */
246 class_dev = sysfs_open_class_device(dev_path);
247 if (class_dev == NULL) {
248 dbg ("sysfs_open_class_device failed");
251 dbg("class_dev->name='%s'", class_dev->name);
257 /* wait for the "dev" file to show up in the directory in sysfs.
258 * If it doesn't happen in about 10 seconds, give up.
260 #define SECONDS_TO_WAIT_FOR_DEV 10
261 static int sleep_for_dev(char *path)
263 char filename[SYSFS_PATH_MAX + 6];
264 int loop = SECONDS_TO_WAIT_FOR_DEV;
267 strcpy(filename, sysfs_path);
268 strcat(filename, path);
269 strcat(filename, "/dev");
274 dbg("looking for '%s'", filename);
275 retval = stat(filename, &buf);
279 /* sleep to give the kernel a chance to create the dev file */
287 int udev_add_device(char *path, char *subsystem)
289 struct sysfs_class_device *class_dev = NULL;
291 int retval = -EINVAL;
293 memset(&dev, 0x00, sizeof(dev));
295 /* for now, the block layer is the only place where block devices are */
296 if (strcmp(subsystem, "block") == 0)
301 retval = sleep_for_dev(path);
305 class_dev = get_class_dev(path);
306 if (class_dev == NULL)
309 retval = get_major_minor(class_dev, &dev);
311 dbg("get_major_minor failed");
315 retval = namedev_name_device(class_dev, &dev);
319 retval = udevdb_add_dev(path, &dev);
321 dbg("udevdb_add_dev failed, but we are going to try to create the node anyway. "
322 "But remove might not work properly for this device.");
324 dbg("name='%s'", dev.name);
325 retval = create_node(&dev);
328 sysbus_send_create(&dev, path);
332 sysfs_close_class_device(class_dev);