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 "namedev.h"
  34 #include "udevdb.h"
  35 #include "libsysfs/libsysfs.h"
  36
  37
  38 /*
  39  * Here would go a call to the naming deamon, to get the name we want to have
  40  * for this device.  But for now, let's just default to whatever the kernel is
  41  * calling the device as that will keep the "old-style" naming policy
  42  */
  43 static char *get_name(char *dev, int major, int minor)
  44 {
  45         static char name[100];
  46         char *temp;
  47
  48         temp = strrchr(dev, '/');
  49         if (temp == NULL)
  50                 return NULL;
  51         strncpy(name, &temp[1], sizeof(name));
  52
  53         dbg("name is %s", name);
  54
  55         return &name[0];
  56 }
  57
  58 /*
  59  * We also want to clean up any symlinks that were created in create_node()
  60  */
  61 static int delete_node(char *name)
  62 {
  63         char filename[255];
  64
  65         strncpy(filename, UDEV_ROOT, sizeof(filename));
  66         strncat(filename, name, sizeof(filename));
  67
  68         dbg("unlinking %s", filename);
  69         return unlink(filename);
  70 }
  71
  72 int udev_remove_device(char *device, char *subsystem)
  73 {
  74         char *name;
  75         int retval = 0;
  76
  77         name = get_name(device, 0, 0);
  78         if (name == NULL) {
  79                 dbg ("get_name failed");
  80                 retval = -ENODEV;
  81                 goto exit;
  82         }
  83
  84         udevdb_delete_udevice(name);
  85
  86         return delete_node(name);
  87
  88 exit:
  89         return retval;
  90 }