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/*
* udev-remove.c
*
* Userspace devfs
*
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
*
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdlib.h>
#include <string.h>
#include <stddef.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include "udev_libc_wrapper.h"
#include "udev.h"
#include "udev_utils.h"
#include "udev_version.h"
#include "udev_db.h"
#include "logging.h"
static int delete_path(const char *path)
{
char *pos;
int retval;
pos = strrchr(path, '/');
while (1) {
*pos = '\0';
pos = strrchr(path, '/');
/* don't remove the last one */
if ((pos == path) || (pos == NULL))
break;
/* remove if empty */
retval = rmdir(path);
if (errno == ENOENT)
retval = 0;
if (retval) {
if (errno == ENOTEMPTY)
return 0;
dbg("rmdir(%s) failed with error '%s'",
path, strerror(errno));
break;
}
dbg("removed '%s'", path);
}
return 0;
}
static int delete_node(struct udevice *udev)
{
char filename[PATH_SIZE];
char partitionname[PATH_SIZE];
struct name_entry *name_loop;
struct stat stats;
int retval;
int i;
int num;
list_for_each_entry(name_loop, &udev->symlink_list, node) {
snprintf(filename, sizeof(filename), "%s/%s", udev_root, name_loop->name);
filename[sizeof(filename)-1] = '\0';
if (stat(filename, &stats) != 0) {
dbg("symlink '%s' not found", filename);
continue;
}
if (udev->devt && stats.st_rdev != udev->devt) {
info("symlink '%s' points to a different device, skip removal", filename);
continue;;
}
dbg("removing symlink '%s'", filename);
unlink(filename);
if (strchr(filename, '/'))
delete_path(filename);
}
snprintf(filename, sizeof(filename), "%s/%s", udev_root, udev->name);
filename[sizeof(filename)-1] = '\0';
if (stat(filename, &stats) != 0) {
dbg("device node '%s' not found", filename);
return -1;
}
if (udev->devt && stats.st_rdev != udev->devt) {
info("device node '%s' points to a different device, skip removal", filename);
return -1;
}
info("removing device node '%s'", filename);
retval = unlink_secure(filename);
if (retval)
return retval;
num = udev->partitions;
if (num > 0) {
info("removing all_partitions '%s[1-%i]'", filename, num);
if (num > 255) {
info("garbage from udev database, skip all_partitions removal");
return -1;
}
for (i = 1; i <= num; i++) {
snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
partitionname[sizeof(partitionname)-1] = '\0';
unlink_secure(partitionname);
}
}
if (strchr(udev->name, '/'))
delete_path(filename);
return retval;
}
/*
* look up the sysfs path in the database to get the node name to remove
* If we can't find it, use kernel name for lack of anything else to know to do
*/
int udev_remove_device(struct udevice *udev)
{
const char *temp;
if (udev->type != DEV_BLOCK && udev->type != DEV_CLASS)
return 0;
if (udev_db_get_device(udev, udev->devpath) == 0) {
if (udev->ignore_remove) {
dbg("remove event for '%s' requested to be ignored by rule", udev->name);
return 0;
}
dbg("remove name='%s'", udev->name);
udev_db_delete_device(udev);
} else {
/* fall back to kernel name */
temp = strrchr(udev->devpath, '/');
if (temp == NULL)
return -ENODEV;
strlcpy(udev->name, &temp[1], sizeof(udev->name));
info("'%s' not found in database, falling back on default name", udev->name);
}
/* use full path to the environment */
snprintf(udev->devname, sizeof(udev->devname), "%s/%s", udev_root, udev->name);
udev->devname[sizeof(udev->devname)-1] = '\0';
return delete_node(udev);
}
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