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"
43 #include "libsysfs/libsysfs.h"
44 #include "klibc_fixups.h"
47 * Right now the major/minor of a device is stored in a file called
49 * The number is stored as:
53 * The value is in decimal.
55 static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
58 struct sysfs_attribute *attr = NULL;
60 attr = sysfs_get_classdev_attr(class_dev, "dev");
63 dbg("dev='%s'", attr->value);
65 if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2)
67 dbg("found major=%d, minor=%d", udev->major, udev->minor);
74 static int create_path(char *file)
81 strncpy(p, file, sizeof(p));
82 pos = strchr(p+1, '/');
84 pos = strchr(pos+1, '/');
88 if (stat(p, &stats)) {
89 retval = mkdir(p, 0755);
91 dbg("mkdir(%s) failed with error '%s'",
95 dbg("created '%s'", p);
102 static int create_node(struct udevice *dev)
106 char linktarget[255];
116 strncpy(filename, udev_root, sizeof(filename));
117 strncat(filename, dev->name, sizeof(filename));
120 res = (dev->major << 8) | (dev->minor);
122 res = makedev(dev->major, dev->minor);
127 dev->mode |= S_IFBLK;
131 dev->mode |= S_IFCHR;
134 dev->mode |= S_IFIFO;
137 dbg("unknown node type %c\n", dev->type);
141 /* create parent directories if needed */
142 if (strrchr(dev->name, '/'))
143 create_path(filename);
145 info("creating device node '%s'", filename);
146 dbg("mknod(%s, %#o, %u, %u)", filename, dev->mode, dev->major, dev->minor);
147 retval = mknod(filename, dev->mode, res);
149 dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
150 filename, dev->mode, dev->major, dev->minor, strerror(errno));
152 dbg("chmod(%s, %#o)", filename, dev->mode);
153 retval = chmod(filename, dev->mode);
155 dbg("chmod(%s, %#o) failed with error '%s'",
156 filename, dev->mode, strerror(errno));
160 unsigned long id = strtoul(dev->owner, &endptr, 10);
164 struct passwd *pw = getpwnam(dev->owner);
166 dbg("user unknown '%s'", dev->owner);
174 unsigned long id = strtoul(dev->group, &endptr, 10);
178 struct group *gr = getgrnam(dev->group);
180 dbg("group unknown '%s'", dev->group);
187 dbg("chown(%s, %u, %u)", filename, uid, gid);
188 retval = chown(filename, uid, gid);
190 dbg("chown(%s, %u, %u) failed with error '%s'",
191 filename, uid, gid, strerror(errno));
194 /* create symlink if requested */
196 symlinks = dev->symlink;
198 linkname = strsep(&symlinks, " ");
199 if (linkname == NULL || linkname[0] == '\0')
202 strncpy(filename, udev_root, sizeof(filename));
203 strncat(filename, linkname, sizeof(filename));
204 dbg("symlink '%s' to node '%s' requested", filename, dev->name);
205 if (strrchr(linkname, '/'))
206 create_path(filename);
208 /* optimize relative link */
209 linktarget[0] = '\0';
212 while ((dev->name[i] == linkname[i]) && dev->name[i]) {
213 if (dev->name[i] == '/')
217 while (linkname[i]) {
218 if (linkname[i] == '/')
219 strcat(linktarget, "../");
223 if (*linktarget == '\0')
224 strcpy(linktarget, "./");
225 strcat(linktarget, &dev->name[tail]);
227 /* unlink existing non-directories to ensure that our symlink
229 if (lstat(filename, &stats) == 0) {
230 if ((stats.st_mode & S_IFMT) != S_IFDIR) {
231 if (unlink(filename))
232 dbg("unlink(%s) failed with error '%s'",
233 filename, strerror(errno));
237 dbg("symlink(%s, %s)", linktarget, filename);
238 retval = symlink(linktarget, filename);
240 dbg("symlink(%s, %s) failed with error '%s'",
241 linktarget, filename, strerror(errno));
248 static struct sysfs_class_device *get_class_dev(char *device_name)
250 char dev_path[SYSFS_PATH_MAX];
251 struct sysfs_class_device *class_dev = NULL;
253 strcpy(dev_path, sysfs_path);
254 strcat(dev_path, device_name);
255 dbg("looking at '%s'", dev_path);
257 /* open up the sysfs class device for this thing... */
258 class_dev = sysfs_open_class_device_path(dev_path);
259 if (class_dev == NULL) {
260 dbg ("sysfs_open_class_device_path failed");
263 dbg("class_dev->name='%s'", class_dev->name);
269 /* wait for the "dev" file to show up in the directory in sysfs.
270 * If it doesn't happen in about 10 seconds, give up.
272 #define SECONDS_TO_WAIT_FOR_DEV 10
273 static int sleep_for_dev(char *path)
275 char filename[SYSFS_PATH_MAX + 6];
276 int loop = SECONDS_TO_WAIT_FOR_DEV;
279 strcpy(filename, sysfs_path);
280 strcat(filename, path);
281 strcat(filename, "/dev");
286 dbg("looking for '%s'", filename);
287 retval = stat(filename, &buf);
291 /* sleep to give the kernel a chance to create the dev file */
299 int udev_add_device(char *path, char *subsystem)
301 struct sysfs_class_device *class_dev = NULL;
303 int retval = -EINVAL;
305 memset(&dev, 0x00, sizeof(dev));
307 /* for now, the block layer is the only place where block devices are */
308 if (strcmp(subsystem, "block") == 0)
313 retval = sleep_for_dev(path);
317 class_dev = get_class_dev(path);
318 if (class_dev == NULL)
321 retval = get_major_minor(class_dev, &dev);
323 dbg("get_major_minor failed");
327 retval = namedev_name_device(class_dev, &dev);
331 retval = udevdb_add_dev(path, &dev);
333 dbg("udevdb_add_dev failed, but we are going to try to create the node anyway. "
334 "But remove might not work properly for this device.");
336 dbg("name='%s'", dev.name);
337 retval = create_node(&dev);
340 sysbus_send_create(&dev, path);
344 sysfs_close_class_device(class_dev);