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)
57 struct sysfs_attribute *attr = NULL;
59 attr = sysfs_get_classdev_attr(class_dev, "dev");
62 dbg("dev='%s'", attr->value);
64 if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2)
66 dbg("found major=%d, minor=%d", udev->major, udev->minor);
73 static int create_path(char *file)
80 strncpy(p, file, sizeof(p));
81 pos = strchr(p+1, '/');
83 pos = strchr(pos+1, '/');
87 if (stat(p, &stats)) {
88 retval = mkdir(p, 0755);
90 dbg("mkdir(%s) failed with error '%s'",
94 dbg("created '%s'", p);
101 static int create_node(struct udevice *dev)
105 char linktarget[255];
115 strncpy(filename, udev_root, sizeof(filename));
116 strncat(filename, dev->name, sizeof(filename));
119 res = (dev->major << 8) | (dev->minor);
121 res = makedev(dev->major, dev->minor);
126 dev->mode |= S_IFBLK;
130 dev->mode |= S_IFCHR;
133 dev->mode |= S_IFIFO;
136 dbg("unknown node type %c\n", dev->type);
140 /* create parent directories if needed */
141 if (strrchr(dev->name, '/'))
142 create_path(filename);
144 dbg("mknod(%s, %#o, %u, %u)", filename, dev->mode, dev->major, dev->minor);
145 retval = mknod(filename, dev->mode, res);
147 dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
148 filename, dev->mode, dev->major, dev->minor, strerror(errno));
150 dbg("chmod(%s, %#o)", filename, dev->mode);
151 retval = chmod(filename, dev->mode);
153 dbg("chmod(%s, %#o) failed with error '%s'",
154 filename, dev->mode, strerror(errno));
158 unsigned long id = strtoul(dev->owner, &endptr, 10);
162 struct passwd *pw = getpwnam(dev->owner);
164 dbg("user unknown '%s'", dev->owner);
172 unsigned long id = strtoul(dev->group, &endptr, 10);
176 struct group *gr = getgrnam(dev->group);
178 dbg("group unknown '%s'", dev->group);
185 dbg("chown(%s, %u, %u)", filename, uid, gid);
186 retval = chown(filename, uid, gid);
188 dbg("chown(%s, %u, %u) failed with error '%s'",
189 filename, uid, gid, strerror(errno));
192 /* create symlink if requested */
194 symlinks = dev->symlink;
196 linkname = strsep(&symlinks, " ");
197 if (linkname == NULL || linkname[0] == '\0')
200 strncpy(filename, udev_root, sizeof(filename));
201 strncat(filename, linkname, sizeof(filename));
202 dbg("symlink '%s' to node '%s' requested", filename, dev->name);
203 if (strrchr(linkname, '/'))
204 create_path(filename);
206 /* optimize relative link */
207 linktarget[0] = '\0';
210 while ((dev->name[i] == linkname[i]) && dev->name[i]) {
211 if (dev->name[i] == '/')
215 while (linkname[i]) {
216 if (linkname[i] == '/')
217 strcat(linktarget, "../");
221 if (*linktarget == '\0')
222 strcpy(linktarget, "./");
223 strcat(linktarget, &dev->name[tail]);
225 /* unlink existing non-directories to ensure that our symlink
227 if (lstat(filename, &stats) == 0) {
228 if ((stats.st_mode & S_IFMT) != S_IFDIR) {
229 if (unlink(filename))
230 dbg("unlink(%s) failed with error '%s'",
231 filename, strerror(errno));
235 dbg("symlink(%s, %s)", linktarget, filename);
236 retval = symlink(linktarget, filename);
238 dbg("symlink(%s, %s) failed with error '%s'",
239 linktarget, filename, strerror(errno));
246 static struct sysfs_class_device *get_class_dev(char *device_name)
248 char dev_path[SYSFS_PATH_MAX];
249 struct sysfs_class_device *class_dev = NULL;
251 strcpy(dev_path, sysfs_path);
252 strcat(dev_path, device_name);
253 dbg("looking at '%s'", dev_path);
255 /* open up the sysfs class device for this thing... */
256 class_dev = sysfs_open_class_device_path(dev_path);
257 if (class_dev == NULL) {
258 dbg ("sysfs_open_class_device_path failed");
261 dbg("class_dev->name='%s'", class_dev->name);
267 /* wait for the "dev" file to show up in the directory in sysfs.
268 * If it doesn't happen in about 10 seconds, give up.
270 #define SECONDS_TO_WAIT_FOR_DEV 10
271 static int sleep_for_dev(char *path)
273 char filename[SYSFS_PATH_MAX + 6];
274 int loop = SECONDS_TO_WAIT_FOR_DEV;
277 strcpy(filename, sysfs_path);
278 strcat(filename, path);
279 strcat(filename, "/dev");
284 dbg("looking for '%s'", filename);
285 retval = stat(filename, &buf);
289 /* sleep to give the kernel a chance to create the dev file */
297 int udev_add_device(char *path, char *subsystem)
299 struct sysfs_class_device *class_dev = NULL;
301 int retval = -EINVAL;
303 memset(&dev, 0x00, sizeof(dev));
305 /* for now, the block layer is the only place where block devices are */
306 if (strcmp(subsystem, "block") == 0)
311 retval = sleep_for_dev(path);
315 class_dev = get_class_dev(path);
316 if (class_dev == NULL)
319 retval = get_major_minor(class_dev, &dev);
321 dbg("get_major_minor failed");
325 retval = namedev_name_device(class_dev, &dev);
329 retval = udevdb_add_dev(path, &dev);
331 dbg("udevdb_add_dev failed, but we are going to try to create the node anyway. "
332 "But remove might not work properly for this device.");
334 dbg("name='%s'", dev.name);
335 retval = create_node(&dev);
338 sysbus_send_create(&dev, path);
342 sysfs_close_class_device(class_dev);