usr/src/cmd/hal/tools/hal_find_by_capability.c

   1 /***************************************************************************
   2  * CVSID: $Id$
   3  *
   4  * hal_find_by_capability.c : Find hal devices
   5  *
   6  * Copyright (C) 2005 David Zeuthen, <david@fubar.dk>
   7  *
   8  * Licensed under the Academic Free License version 2.1
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  23  *
  24  **************************************************************************/
  25
  26
  27 #ifdef HAVE_CONFIG_H
  28 #  include <config.h>
  29 #endif
  30
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <unistd.h>
  34 #include <getopt.h>
  35
  36 #include <libhal.h>
  37
  38
  39 /** Print out program usage.
  40  *
  41  *  @param  argc                Number of arguments given to program
  42  *  @param  argv                Arguments given to program
  43  */
  44 static void
  45 usage (int argc, char *argv[])
  46 {
  47         fprintf (stderr,
  48  "\n"
  49  "usage : hal-find-by-capability --capability <capability>\n"
  50  "                              [--help] [--verbose] [--version]\n");
  51         fprintf (stderr,
  52  "\n"
  53  "        --capability     HAL Device Capability to search for\n"
  54  "        --verbose        Be verbose\n"
  55  "        --version        Show version and exit\n"
  56  "        --help           Show this information and exit\n"
  57  "\n"
  58  "This program prints the Unique Device Identifiers for HAL device\n"
  59  "objects of a given capability on stdout and exits with exit code 0\n"
  60  "If there is an error, the program exits with an exit code different\n"
  61  "from 0.\n"
  62  "\n");
  63 }
  64
  65 /** Entry point
  66  *
  67  *  @param  argc                Number of arguments given to program
  68  *  @param  argv                Arguments given to program
  69  *  @return                     Return code
  70  */
  71 int
  72 main (int argc, char *argv[])
  73 {
  74         int i;
  75         int num_udis;
  76         char **udis;
  77         char *capability = NULL;
  78         dbus_bool_t is_verbose = FALSE;
  79         dbus_bool_t is_version = FALSE;
  80         DBusError error;
  81         LibHalContext *hal_ctx;
  82
  83         if (argc <= 1) {
  84                 usage (argc, argv);
  85                 return 1;
  86         }
  87
  88         while (1) {
  89                 int c;
  90                 int option_index = 0;
  91                 const char *opt;
  92                 static struct option long_options[] = {
  93                         {"capability", 1, NULL, 0},
  94                         {"verbose", 0, NULL, 0},
  95                         {"version", 0, NULL, 0},
  96                         {"help", 0, NULL, 0},
  97                         {NULL, 0, NULL, 0}
  98                 };
  99
 100                 c = getopt_long (argc, argv, "",
 101                                  long_options, &option_index);
 102                 if (c == -1)
 103                         break;
 104
 105                 switch (c) {
 106                 case 0:
 107                         opt = long_options[option_index].name;
 108
 109                         if (strcmp (opt, "help") == 0) {
 110                                 usage (argc, argv);
 111                                 return 0;
 112                         } else if (strcmp (opt, "verbose") == 0) {
 113                                 is_verbose = TRUE;
 114                         } else if (strcmp (opt, "version") == 0) {
 115                                 is_version = TRUE;
 116                         } else if (strcmp (opt, "capability") == 0) {
 117                                 capability = strdup (optarg);
 118                         }
 119                         break;
 120
 121                 default:
 122                         usage (argc, argv);
 123                         return 1;
 124                         break;
 125                 }
 126         }
 127
 128         if (is_version) {
 129                 printf ("hal-find-by-capability " PACKAGE_VERSION "\n");
 130                 return 0;
 131         }
 132
 133         if (capability == NULL) {
 134                 usage (argc, argv);
 135                 return 1;
 136         }
 137
 138         dbus_error_init (&error);
 139         if ((hal_ctx = libhal_ctx_new ()) == NULL) {
 140                 fprintf (stderr, "error: libhal_ctx_new\n");
 141                 LIBHAL_FREE_DBUS_ERROR (&error);
 142                 return 1;
 143         }
 144         if (!libhal_ctx_set_dbus_connection (hal_ctx, dbus_bus_get (DBUS_BUS_SYSTEM, &error))) {
 145                 fprintf (stderr, "error: libhal_ctx_set_dbus_connection: %s: %s\n", error.name, error.message);
 146                 LIBHAL_FREE_DBUS_ERROR (&error);
 147                 return 1;
 148         }
 149         if (!libhal_ctx_init (hal_ctx, &error)) {
 150                 if (dbus_error_is_set(&error)) {
 151                         fprintf (stderr, "error: libhal_ctx_init: %s: %s\n", error.name, error.message);
 152                         LIBHAL_FREE_DBUS_ERROR (&error);
 153                 }
 154                 fprintf (stderr, "Could not initialise connection to hald.\n"
 155                                  "Normally this means the HAL daemon (hald) is not running or not ready.\n");
 156                 return 1;
 157         }
 158
 159
 160         udis = libhal_find_device_by_capability (hal_ctx, capability, &num_udis, &error);
 161
 162         if (dbus_error_is_set (&error)) {
 163                 fprintf (stderr, "error: %s: %s\n", error.name, error.message);
 164                 LIBHAL_FREE_DBUS_ERROR (&error);
 165                 return 1;
 166         }
 167
 168         if (is_verbose)
 169                 printf ("Found %d device objects of capability '%s'\n", num_udis, capability);
 170
 171         if (num_udis == 0) {
 172                 return 1;
 173         }
 174
 175         for (i = 0; i < num_udis; i++) {
 176                 printf ("%s\n", udis[i]);
 177         }
 178
 179         libhal_free_string_array (udis);
 180
 181         return 0;
 182 }
 183
 184 /**
 185  * @}
 186  */