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 "udevdb.h"
  35 #include "libsysfs/libsysfs.h"
  36
  37
  38 static char *get_action(void)
  39 {
  40         char *action;
  41
  42         action = getenv("ACTION");
  43         return action;
  44 }
  45
  46
  47 static char *get_device(void)
  48 {
  49         char *device;
  50
  51         device = getenv("DEVPATH");
  52         return device;
  53 }
  54
  55 int main(int argc, char *argv[])
  56 {
  57         char *action;
  58         char *device;
  59         char *subsystem;
  60         int retval = -EINVAL;
  61
  62         if (argc != 2) {
  63                 dbg ("unknown number of arguments");
  64                 goto exit;
  65         }
  66
  67         subsystem = argv[1];
  68
  69         device = get_device();
  70         if (!device) {
  71                 dbg ("no device?");
  72                 goto exit;
  73         }
  74         dbg("looking at %s", device);
  75
  76         /* we only care about class devices and block stuff */
  77         if (!strstr(device, "class") &&
  78             !strstr(device, "block")) {
  79                 dbg("not block or class");
  80                 goto exit;
  81         }
  82
  83         /* but we don't care about net class devices */
  84         if (strcmp(subsystem, "net") == 0) {
  85                 dbg("don't care about net devices");
  86                 goto exit;
  87         }
  88
  89         action = get_action();
  90         if (!action) {
  91                 dbg ("no action?");
  92                 goto exit;
  93         }
  94
  95         /* initialize udev database */
  96         retval = udevdb_init(UDEVDB_DEFAULT);
  97         if (retval != 0) {
  98                 dbg("Unable to initialize database.");
  99                 goto exit;
 100         }
 101
 102         /* initialize the naming deamon */
 103         namedev_init();
 104
 105         if (strcmp(action, "add") == 0)
 106                 retval = udev_add_device(device, argv[1]);
 107
 108         else if (strcmp(action, "remove") == 0)
 109                 retval = udev_remove_device(device, argv[1]);
 110
 111         else {
 112                 dbg("Unknown action: %s", action);
 113                 retval = -EINVAL;
 114         }
 115         udevdb_exit();
 116
 117 exit:
 118         return retval;
 119 }
 120