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 #include <ctype.h>
  31
  32 #include "udev.h"
  33 #include "udev_version.h"
  34 #include "udev_dbus.h"
  35 #include "namedev.h"
  36 #include "udevdb.h"
  37 #include "libsysfs/libsysfs.h"
  38
  39 /* global variables */
  40 char **main_argv;
  41 char **main_envp;
  42
  43 static inline char *get_action(void)
  44 {
  45         char *action;
  46
  47         action = getenv("ACTION");
  48         return action;
  49 }
  50
  51 static inline char *get_devpath(void)
  52 {
  53         char *devpath;
  54
  55         devpath = getenv("DEVPATH");
  56         return devpath;
  57 }
  58
  59 static inline char *get_seqnum(void)
  60 {
  61         char *seqnum;
  62
  63         seqnum = getenv("SEQNUM");
  64         return seqnum;
  65 }
  66
  67 int main(int argc, char **argv, char **envp)
  68 {
  69         char *action;
  70         char *devpath;
  71         char *subsystem;
  72         int retval = -EINVAL;
  73
  74         main_argv = argv;
  75         main_envp = envp;
  76
  77         dbg("version %s", UDEV_VERSION);
  78
  79         if (argc != 2) {
  80                 dbg ("unknown number of arguments");
  81                 goto exit;
  82         }
  83
  84         subsystem = argv[1];
  85
  86         devpath = get_devpath();
  87         if (!devpath) {
  88                 dbg ("no devpath?");
  89                 goto exit;
  90         }
  91         dbg("looking at '%s'", devpath);
  92
  93         /* we only care about class devices and block stuff */
  94         if (!strstr(devpath, "class") &&
  95             !strstr(devpath, "block")) {
  96                 dbg("not a block or class device");
  97                 goto exit;
  98         }
  99
 100         /* but we don't care about net class devices */
 101         if (strcmp(subsystem, "net") == 0) {
 102                 dbg("don't care about net devices");
 103                 goto exit;
 104         }
 105
 106         action = get_action();
 107         if (!action) {
 108                 dbg ("no action?");
 109                 goto exit;
 110         }
 111
 112         /* initialize our configuration */
 113         udev_init_config();
 114
 115         /* connect to the system message bus */
 116         sysbus_connect();
 117
 118         /* initialize udev database */
 119         retval = udevdb_init(UDEVDB_DEFAULT);
 120         if (retval != 0) {
 121                 dbg("unable to initialize database");
 122                 goto exit;
 123         }
 124
 125         /* initialize the naming deamon */
 126         namedev_init();
 127
 128         if (strcmp(action, "add") == 0)
 129                 retval = udev_add_device(devpath, subsystem);
 130
 131         else if (strcmp(action, "remove") == 0)
 132                 retval = udev_remove_device(devpath, subsystem);
 133
 134         else {
 135                 dbg("unknown action '%s'", action);
 136                 retval = -EINVAL;
 137         }
 138         udevdb_exit();
 139
 140         /* disconnect from the system message bus */
 141         sysbus_disconnect();
 142
 143 exit:
 144         return retval;
 145 }