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 "logging.h"
  35 #include "namedev.h"
  36 #include "udevdb.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 (errno == ENOENT)
  55                         retval = 0;
  56                 if (retval) {
  57                         if (errno == ENOTEMPTY)
  58                                 return 0;
  59                         dbg("rmdir(%s) failed with error '%s'",
  60                             path, strerror(errno));
  61                         break;
  62                 }
  63                 dbg("removed '%s'", path);
  64         }
  65         return 0;
  66 }
  67
  68 static int delete_node(struct udevice *dev)
  69 {
  70         char filename[255];
  71         char partitionname[255];
  72         char *symlinks;
  73         char *linkname;
  74         int retval;
  75         int i;
  76
  77         strfieldcpy(filename, udev_root);
  78         strfieldcat(filename, dev->name);
  79
  80         info("removing device node '%s'", filename);
  81         retval = unlink(filename);
  82         if (errno == ENOENT)
  83                 retval = 0;
  84         if (retval) {
  85                 dbg("unlink(%s) failed with error '%s'",
  86                         filename, strerror(errno));
  87                 return retval;
  88         }
  89
  90         /* remove partition nodes */
  91         if (dev->partitions > 0) {
  92                 info("removing partitions '%s[1-%i]'", filename, dev->partitions);
  93                 for (i = 1; i <= dev->partitions; i++) {
  94                         strfieldcpy(partitionname, filename);
  95                         strintcat(partitionname, i);
  96                         unlink(partitionname);
  97                 }
  98         }
  99
 100         /* remove subdirectories */
 101         if (strchr(dev->name, '/'))
 102                 delete_path(filename);
 103
 104         if (dev->symlink[0] != '\0') {
 105                 symlinks = dev->symlink;
 106                 while (1) {
 107                         linkname = strsep(&symlinks, " ");
 108                         if (linkname == NULL)
 109                                 break;
 110
 111                         strfieldcpy(filename, udev_root);
 112                         strfieldcat(filename, linkname);
 113
 114                         dbg("unlinking symlink '%s'", filename);
 115                         retval = unlink(filename);
 116                         if (errno == ENOENT)
 117                                 retval = 0;
 118                         if (retval) {
 119                                 dbg("unlink(%s) failed with error '%s'",
 120                                         filename, strerror(errno));
 121                                 return retval;
 122                         }
 123                         if (strchr(dev->symlink, '/')) {
 124                                 delete_path(filename);
 125                         }
 126                 }
 127         }
 128
 129         return retval;
 130 }
 131
 132 /*
 133  * Look up the sysfs path in the database to see if we have named this device
 134  * something different from the kernel name.  If we have, us it.  If not, use
 135  * the default kernel name for lack of anything else to know to do.
 136  */
 137 int udev_remove_device(char *path, char *subsystem)
 138 {
 139         struct udevice dev;
 140         char *temp;
 141         int retval;
 142
 143         memset(&dev, 0, sizeof(dev));
 144
 145         retval = udevdb_get_dev(path, &dev);
 146         if (retval) {
 147                 dbg("'%s' not found in database, falling back on default name", path);
 148                 temp = strrchr(path, '/');
 149                 if (temp == NULL)
 150                         return -ENODEV;
 151                 strfieldcpy(dev.name, &temp[1]);
 152         }
 153
 154         dbg("name is '%s'", dev.name);
 155         udevdb_delete_dev(path);
 156
 157         sysbus_send_remove(dev.name, path);
 158
 159         retval = delete_node(&dev);
 160         return retval;
 161 }