udev-remove.c

   1 /*
   2  * udev-remove.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  *
   8  *
   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.
  12  *
  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.
  17  *
  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.
  21  *
  22  */
  23
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <stdio.h>
  27 #include <fcntl.h>
  28 #include <unistd.h>
  29 #include <errno.h>
  30
  31 #include "udev.h"
  32 #include "udev_version.h"
  33 #include "udev_dbus.h"
  34 #include "namedev.h"
  35 #include "udevdb.h"
  36 #include "libsysfs/libsysfs.h"
  37
  38 static int delete_path(char *path)
  39 {
  40         char *pos;
  41         int retval;
  42
  43         pos = strrchr(path, '/');
  44         while (1) {
  45                 *pos = '\0';
  46                 pos = strrchr(path, '/');
  47
  48                 /* don't remove the last one */
  49                 if ((pos == path) || (pos == NULL))
  50                         break;
  51
  52                 /* remove if empty */
  53                 retval = rmdir(path);
  54                 if (retval) {
  55                         if (errno == ENOTEMPTY)
  56                                 return 0;
  57                         dbg("rmdir(%s) failed with error '%s'",
  58                             path, strerror(errno));
  59                         break;
  60                 }
  61                 dbg("removed '%s'", path);
  62         }
  63         return 0;
  64 }
  65
  66 static int delete_node(struct udevice *dev)
  67 {
  68         char filename[255];
  69         char *symlinks;
  70         char *linkname;
  71         int retval;
  72
  73         strncpy(filename, udev_root, sizeof(filename));
  74         strncat(filename, dev->name, sizeof(filename));
  75
  76         dbg("unlinking node '%s'", filename);
  77         retval = unlink(filename);
  78         if (retval) {
  79                 dbg("unlink(%s) failed with error '%s'",
  80                         filename, strerror(errno));
  81                 return retval;
  82         }
  83
  84         /* remove subdirectories */
  85         if (strchr(dev->name, '/'))
  86                 delete_path(filename);
  87
  88         if (*dev->symlink) {
  89                 symlinks = dev->symlink;
  90                 while (1) {
  91                         linkname = strsep(&symlinks, " ");
  92                         if (linkname == NULL)
  93                                 break;
  94
  95                         strncpy(filename, udev_root, sizeof(filename));
  96                         strncat(filename, linkname, sizeof(filename));
  97
  98                         dbg("unlinking symlink '%s'", filename);
  99                         retval = unlink(filename);
 100                         if (retval) {
 101                                 dbg("unlink(%s) failed with error '%s'",
 102                                         filename, strerror(errno));
 103                                 return retval;
 104                         }
 105                         if (strchr(dev->symlink, '/')) {
 106                                 delete_path(filename);
 107                         }
 108                 }
 109         }
 110
 111         return retval;
 112 }
 113
 114 /*
 115  * Look up the sysfs path in the database to see if we have named this device
 116  * something different from the kernel name.  If we have, us it.  If not, use
 117  * the default kernel name for lack of anything else to know to do.
 118  */
 119 int udev_remove_device(char *path, char *subsystem)
 120 {
 121         struct udevice dev;
 122         char *temp;
 123         int retval;
 124
 125         memset(&dev, 0, sizeof(dev));
 126
 127         retval = udevdb_get_dev(path, &dev);
 128         if (retval) {
 129                 dbg("'%s' not found in database, falling back on default name", path);
 130                 temp = strrchr(path, '/');
 131                 if (temp == NULL)
 132                         return -ENODEV;
 133                 strncpy(dev.name, &temp[1], sizeof(dev.name));
 134         }
 135
 136         dbg("name is '%s'", dev.name);
 137         udevdb_delete_dev(path);
 138
 139         sysbus_send_remove(dev.name, path);
 140
 141         retval = delete_node(&dev);
 142         return retval;
 143 }