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

   1 /***************************************************************************
   2  * CVSID: $Id$
   3  *
   4  * hal_find_by_property.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-property --key <key> --string <value>\n"
  50  "                              [--help] [--verbose] [--version]\n");
  51
  52 /** @todo support other property types a'la hal-[get|set]-property */
  53
  54         fprintf (stderr,
  55  "\n"
  56  "        --key            Key of the property to check\n"
  57  "        --string         String value of property\n"
  58  "        --verbose        Be verbose\n"
  59  "        --version        Show version and exit\n"
  60  "        --help           Show this information and exit\n"
  61  "\n"
  62  "This program prints the Unique Device Identifiers for HAL device\n"
  63  "objects where a given property assumes a given value. On success\n"
  64  "the program exists with exit code 0. If there is an error, the\n"
  65  "program exits with an exit code different from 0.\n"
  66  "\n");
  67 }
  68
  69 /** Entry point
  70  *
  71  *  @param  argc                Number of arguments given to program
  72  *  @param  argv                Arguments given to program
  73  *  @return                     Return code
  74  */
  75 int
  76 main (int argc, char *argv[])
  77 {
  78         int i;
  79         int num_udis;
  80         char **udis;
  81         char *key = NULL;
  82         char *value = NULL;
  83         dbus_bool_t is_verbose = FALSE;
  84         dbus_bool_t is_version = FALSE;
  85         DBusError error;
  86         LibHalContext *hal_ctx;
  87
  88         if (argc <= 1) {
  89                 usage (argc, argv);
  90                 return 1;
  91         }
  92
  93         while (1) {
  94                 int c;
  95                 int option_index = 0;
  96                 const char *opt;
  97                 static struct option long_options[] = {
  98                         {"key", 1, NULL, 0},
  99                         {"string", 1, NULL, 0},
 100                         {"verbose", 0, NULL, 0},
 101                         {"version", 0, NULL, 0},
 102                         {"help", 0, NULL, 0},
 103                         {NULL, 0, NULL, 0}
 104                 };
 105
 106                 c = getopt_long (argc, argv, "",
 107                                  long_options, &option_index);
 108                 if (c == -1)
 109                         break;
 110
 111                 switch (c) {
 112                 case 0:
 113                         opt = long_options[option_index].name;
 114
 115                         if (strcmp (opt, "help") == 0) {
 116                                 usage (argc, argv);
 117                                 return 0;
 118                         } else if (strcmp (opt, "verbose") == 0) {
 119                                 is_verbose = TRUE;
 120                         } else if (strcmp (opt, "version") == 0) {
 121                                 is_version = TRUE;
 122                         } else if (strcmp (opt, "key") == 0) {
 123                                 key = strdup (optarg);
 124                         } else if (strcmp (opt, "string") == 0) {
 125                                 value = strdup (optarg);
 126                         }
 127                         break;
 128
 129                 default:
 130                         usage (argc, argv);
 131                         return 1;
 132                         break;
 133                 }
 134         }
 135
 136         if (is_version) {
 137                 printf ("hal-find-by-property " PACKAGE_VERSION "\n");
 138                 return 0;
 139         }
 140
 141         if (key == NULL || value == NULL) {
 142                 usage (argc, argv);
 143                 return 1;
 144         }
 145
 146         dbus_error_init (&error);
 147         if ((hal_ctx = libhal_ctx_new ()) == NULL) {
 148                 fprintf (stderr, "error: libhal_ctx_new\n");
 149                 return 1;
 150         }
 151         if (!libhal_ctx_set_dbus_connection (hal_ctx, dbus_bus_get (DBUS_BUS_SYSTEM, &error))) {
 152                 fprintf (stderr, "error: libhal_ctx_set_dbus_connection: %s: %s\n", error.name, error.message);
 153                 LIBHAL_FREE_DBUS_ERROR (&error);
 154                 return 1;
 155         }
 156         if (!libhal_ctx_init (hal_ctx, &error)) {
 157                 if (dbus_error_is_set(&error)) {
 158                         fprintf (stderr, "error: libhal_ctx_init: %s: %s\n", error.name, error.message);
 159                         LIBHAL_FREE_DBUS_ERROR (&error);
 160                 }
 161                 fprintf (stderr, "Could not initialise connection to hald.\n"
 162                                  "Normally this means the HAL daemon (hald) is not running or not ready.\n");
 163                 return 1;
 164         }
 165
 166
 167         udis = libhal_manager_find_device_string_match (hal_ctx, key, value, &num_udis, &error);
 168
 169         if (dbus_error_is_set (&error)) {
 170                 fprintf (stderr, "error: %s: %s\n", error.name, error.message);
 171                 LIBHAL_FREE_DBUS_ERROR (&error);
 172                 return 1;
 173         }
 174
 175         if (is_verbose)
 176                 printf ("Found %d device objects with string property %s = '%s'\n", num_udis, key, value);
 177
 178         if (num_udis == 0) {
 179                 return 1;
 180         }
 181
 182         for (i = 0; i < num_udis; i++) {
 183                 printf ("%s\n", udis[i]);
 184         }
 185
 186         libhal_free_string_array (udis);
 187
 188         return 0;
 189 }
 190
 191 /**
 192  * @}
 193  */