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>
37 #include "libsysfs/sysfs/libsysfs.h"
39 #include "udev_version.h"
40 #include "udev_dbus.h"
41 #include "udev_selinux.h"
45 #include "klibc_fixups.h"
48 * Right now the major/minor of a device is stored in a file called
50 * The number is stored as:
54 * The value is in decimal.
56 static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
59 struct sysfs_attribute *attr = NULL;
61 attr = sysfs_get_classdev_attr(class_dev, "dev");
64 dbg("dev='%s'", attr->value);
66 if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2)
68 dbg("found major=%d, minor=%d", udev->major, udev->minor);
75 static int create_path(char *file)
83 pos = strchr(p+1, '/');
85 pos = strchr(pos+1, '/');
89 if (stat(p, &stats)) {
90 retval = mkdir(p, 0755);
92 dbg("mkdir(%s) failed with error '%s'",
96 dbg("created '%s'", p);
103 static int make_node(char *filename, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
107 retval = mknod(filename, mode, makedev(major, minor));
109 dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
110 filename, mode, major, minor, strerror(errno));
114 dbg("chmod(%s, %#o)", filename, mode);
115 retval = chmod(filename, mode);
117 dbg("chmod(%s, %#o) failed with error '%s'",
118 filename, mode, strerror(errno));
122 if (uid != 0 || gid != 0) {
123 dbg("chown(%s, %u, %u)", filename, uid, gid);
124 retval = chown(filename, uid, gid);
126 dbg("chown(%s, %u, %u) failed with error '%s'",
127 filename, uid, gid, strerror(errno));
135 static int create_node(struct udevice *dev, int fake)
139 char linktarget[255];
140 char partitionname[255];
149 strfieldcpy(filename, udev_root);
150 strfieldcat(filename, dev->name);
154 dev->mode |= S_IFBLK;
158 dev->mode |= S_IFCHR;
161 dev->mode |= S_IFIFO;
164 dbg("unknown node type %c\n", dev->type);
168 /* create parent directories if needed */
169 if (strrchr(dev->name, '/'))
170 create_path(filename);
172 if (dev->owner[0] != '\0') {
174 unsigned long id = strtoul(dev->owner, &endptr, 10);
175 if (endptr[0] == '\0')
178 struct passwd *pw = getpwnam(dev->owner);
180 dbg("specified user unknown '%s'", dev->owner);
186 if (dev->group[0] != '\0') {
188 unsigned long id = strtoul(dev->group, &endptr, 10);
189 if (endptr[0] == '\0')
192 struct group *gr = getgrnam(dev->group);
194 dbg("specified group unknown '%s'", dev->group);
201 info("creating device node '%s'", filename);
202 make_node(filename, dev->major, dev->minor, dev->mode, uid, gid);
204 info("creating device node '%s', major = '%d', minor = '%d', "
205 "mode = '%#o', uid = '%d', gid = '%d'", filename,
206 dev->major, dev->minor, (mode_t)dev->mode, uid, gid);
209 /* create partitions if requested */
210 if (dev->partitions > 0) {
211 info("creating device partition nodes '%s[1-%i]'", filename, dev->partitions);
213 for (i = 1; i <= dev->partitions; i++) {
214 strfieldcpy(partitionname, filename);
215 strintcat(partitionname, i);
216 make_node(partitionname, dev->major,
217 dev->minor + i, dev->mode, uid, gid);
223 selinux_add_node(filename);
225 /* create symlink if requested */
226 if (dev->symlink[0] != '\0') {
227 symlinks = dev->symlink;
229 linkname = strsep(&symlinks, " ");
230 if (linkname == NULL || linkname[0] == '\0')
233 strfieldcpy(filename, udev_root);
234 strfieldcat(filename, linkname);
235 dbg("symlink '%s' to node '%s' requested", filename, dev->name);
237 if (strrchr(linkname, '/'))
238 create_path(filename);
240 /* optimize relative link */
241 linktarget[0] = '\0';
244 while ((dev->name[i] == linkname[i]) && dev->name[i]) {
245 if (dev->name[i] == '/')
249 while (linkname[i] != '\0') {
250 if (linkname[i] == '/')
251 strfieldcat(linktarget, "../");
255 strfieldcat(linktarget, &dev->name[tail]);
257 /* unlink existing files to ensure that our symlink is created */
258 if (!fake && (lstat(filename, &stats) == 0)) {
259 if ((stats.st_mode & S_IFMT) != S_IFDIR) {
260 if (unlink(filename))
261 dbg("unlink(%s) failed with error '%s'",
262 filename, strerror(errno));
266 dbg("symlink(%s, %s)", linktarget, filename);
268 retval = symlink(linktarget, filename);
270 dbg("symlink(%s, %s) failed with error '%s'",
271 linktarget, filename, strerror(errno));
279 static struct sysfs_class_device *get_class_dev(char *device_name)
281 char dev_path[SYSFS_PATH_MAX];
282 struct sysfs_class_device *class_dev = NULL;
284 strfieldcpy(dev_path, sysfs_path);
285 strfieldcat(dev_path, device_name);
286 dbg("looking at '%s'", dev_path);
288 /* open up the sysfs class device for this thing... */
289 class_dev = sysfs_open_class_device_path(dev_path);
290 if (class_dev == NULL) {
291 dbg ("sysfs_open_class_device_path failed");
294 dbg("class_dev->name='%s'", class_dev->name);
300 /* wait for the "dev" file to show up in the directory in sysfs.
301 * If it doesn't happen in about 10 seconds, give up.
303 #define SECONDS_TO_WAIT_FOR_DEV 10
304 static int sleep_for_dev(char *path)
306 char filename[SYSFS_PATH_MAX + 6];
307 int loop = SECONDS_TO_WAIT_FOR_DEV;
310 strfieldcpy(filename, sysfs_path);
311 strfieldcat(filename, path);
312 strfieldcat(filename, "/dev");
317 dbg("looking for '%s'", filename);
318 retval = stat(filename, &buf);
322 /* sleep to give the kernel a chance to create the dev file */
330 int udev_add_device(char *path, char *subsystem, int fake)
332 struct sysfs_class_device *class_dev = NULL;
334 int retval = -EINVAL;
336 memset(&dev, 0x00, sizeof(dev));
338 /* for now, the block layer is the only place where block devices are */
339 if (strcmp(subsystem, "block") == 0)
344 retval = sleep_for_dev(path);
348 class_dev = get_class_dev(path);
349 if (class_dev == NULL)
352 retval = get_major_minor(class_dev, &dev);
354 dbg("get_major_minor failed");
358 retval = namedev_name_device(class_dev, &dev);
363 retval = udevdb_add_dev(path, &dev);
365 dbg("udevdb_add_dev failed, but we are going to try "
366 "to create the node anyway. But remove might not "
367 "work properly for this device.");
370 dbg("name='%s'", dev.name);
371 retval = create_node(&dev, fake);
373 if ((retval == 0) && (!fake))
374 sysbus_send_create(&dev, path);
378 sysfs_close_class_device(class_dev);