udev.c

   1 /*
   2  * udev.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 static char *get_action(void)
  38 {
  39         char *action;
  40
  41         action = getenv("ACTION");
  42         return action;
  43 }
  44
  45
  46 static char *get_device(void)
  47 {
  48         char *device;
  49
  50         device = getenv("DEVPATH");
  51         return device;
  52 }
  53
  54 int main(int argc, char *argv[])
  55 {
  56         char *action;
  57         char *device;
  58         char *subsystem;
  59         int retval = -EINVAL;
  60
  61         if (argc != 2) {
  62                 dbg ("unknown number of arguments");
  63                 goto exit;
  64         }
  65
  66         subsystem = argv[1];
  67
  68         device = get_device();
  69         if (!device) {
  70                 dbg ("no device?");
  71                 goto exit;
  72         }
  73         dbg("looking at %s", device);
  74
  75         /* we only care about class devices and block stuff */
  76         if (!strstr(device, "class") &&
  77             !strstr(device, "block")) {
  78                 dbg("not block or class");
  79                 goto exit;
  80         }
  81
  82         /* but we don't care about net class devices */
  83         if (strcmp(subsystem, "net") == 0) {
  84                 dbg("don't care about net devices");
  85                 goto exit;
  86         }
  87
  88         action = get_action();
  89         if (!action) {
  90                 dbg ("no action?");
  91                 goto exit;
  92         }
  93
  94         /* initialize the naming deamon */
  95         namedev_init();
  96
  97         if (strcmp(action, "add") == 0)
  98                 return udev_add_device(device, argv[1]);
  99
 100         if (strcmp(action, "remove") == 0)
 101                 return udev_remove_device(device, argv[1]);
 102
 103         dbg("Unknown action: %s", action);
 104         retval = -EINVAL;
 105
 106 exit:
 107         return retval;
 108 }
 109