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