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