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_lib.h"
  33 #include "udev_version.h"
  34 #include "udev_dbus.h"
  35 #include "logging.h"
  36 #include "namedev.h"
  37 #include "udevdb.h"
  38
  39 static int delete_path(char *path)
  40 {
  41         char *pos;
  42         int retval;
  43
  44         pos = strrchr(path, '/');
  45         while (1) {
  46                 *pos = '\0';
  47                 pos = strrchr(path, '/');
  48
  49                 /* don't remove the last one */
  50                 if ((pos == path) || (pos == NULL))
  51                         break;
  52
  53                 /* remove if empty */
  54                 retval = rmdir(path);
  55                 if (errno == ENOENT)
  56                         retval = 0;
  57                 if (retval) {
  58                         if (errno == ENOTEMPTY)
  59                                 return 0;
  60                         dbg("rmdir(%s) failed with error '%s'",
  61                             path, strerror(errno));
  62                         break;
  63                 }
  64                 dbg("removed '%s'", path);
  65         }
  66         return 0;
  67 }
  68
  69 static int delete_node(struct udevice *dev)
  70 {
  71         char filename[NAME_SIZE];
  72         char linkname[NAME_SIZE];
  73         char partitionname[NAME_SIZE];
  74         int retval;
  75         int i;
  76         char *pos;
  77         int len;
  78
  79         strfieldcpy(filename, udev_root);
  80         strfieldcat(filename, dev->name);
  81
  82         info("removing device node '%s'", filename);
  83         retval = unlink(filename);
  84         if (errno == ENOENT)
  85                 retval = 0;
  86         if (retval) {
  87                 dbg("unlink(%s) failed with error '%s'",
  88                         filename, strerror(errno));
  89                 return retval;
  90         }
  91
  92         /* remove partition nodes */
  93         if (dev->partitions > 0) {
  94                 info("removing partitions '%s[1-%i]'", filename, dev->partitions);
  95                 for (i = 1; i <= dev->partitions; i++) {
  96                         strfieldcpy(partitionname, filename);
  97                         strintcat(partitionname, i);
  98                         unlink(partitionname);
  99                 }
 100         }
 101
 102         /* remove subdirectories */
 103         if (strchr(dev->name, '/'))
 104                 delete_path(filename);
 105
 106         foreach_strpart(dev->symlink, " ", pos, len) {
 107                 strfieldcpymax(linkname, pos, len+1);
 108                 strfieldcpy(filename, udev_root);
 109                 strfieldcat(filename, linkname);
 110
 111                 dbg("unlinking symlink '%s'", filename);
 112                 retval = unlink(filename);
 113                 if (errno == ENOENT)
 114                         retval = 0;
 115                 if (retval) {
 116                         dbg("unlink(%s) failed with error '%s'",
 117                                 filename, strerror(errno));
 118                         return retval;
 119                 }
 120                 if (strchr(dev->symlink, '/')) {
 121                         delete_path(filename);
 122                 }
 123         }
 124
 125         return retval;
 126 }
 127
 128 /*
 129  * Look up the sysfs path in the database to see if we have named this device
 130  * something different from the kernel name.  If we have, us it.  If not, use
 131  * the default kernel name for lack of anything else to know to do.
 132  */
 133 int udev_remove_device(char *path, char *subsystem)
 134 {
 135         struct udevice dev;
 136         char *temp;
 137         int retval;
 138
 139         memset(&dev, 0, sizeof(dev));
 140
 141         retval = udevdb_get_dev(path, &dev);
 142         if (retval) {
 143                 dbg("'%s' not found in database, falling back on default name", path);
 144                 temp = strrchr(path, '/');
 145                 if (temp == NULL)
 146                         return -ENODEV;
 147                 strfieldcpy(dev.name, &temp[1]);
 148         }
 149
 150         dbg("name is '%s'", dev.name);
 151         udevdb_delete_dev(path);
 152
 153         sysbus_send_remove(dev.name, path);
 154
 155         retval = delete_node(&dev);
 156         return retval;
 157 }