programs/explorer/hal.c

   1 /*
   2  * HAL devices support
   3  *
   4  * Copyright 2006 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <errno.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <sys/time.h>
  29
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "winreg.h"
  33 #include "winuser.h"
  34 #include "excpt.h"
  35
  36 #include "wine/library.h"
  37 #include "wine/exception.h"
  38 #include "wine/debug.h"
  39 #include "explorer_private.h"
  40
  41 WINE_DEFAULT_DEBUG_CHANNEL(explorer);
  42
  43 #ifdef SONAME_LIBHAL
  44
  45 #include <dbus/dbus.h>
  46 #include <hal/libhal.h>
  47
  48 #define DBUS_FUNCS \
  49     DO_FUNC(dbus_bus_get); \
  50     DO_FUNC(dbus_connection_close); \
  51     DO_FUNC(dbus_connection_read_write_dispatch); \
  52     DO_FUNC(dbus_error_init); \
  53     DO_FUNC(dbus_error_free); \
  54     DO_FUNC(dbus_error_is_set)
  55
  56 #define HAL_FUNCS \
  57     DO_FUNC(libhal_ctx_free); \
  58     DO_FUNC(libhal_ctx_init); \
  59     DO_FUNC(libhal_ctx_new); \
  60     DO_FUNC(libhal_ctx_set_dbus_connection); \
  61     DO_FUNC(libhal_ctx_set_device_added); \
  62     DO_FUNC(libhal_ctx_set_device_property_modified); \
  63     DO_FUNC(libhal_ctx_set_device_removed); \
  64     DO_FUNC(libhal_ctx_shutdown); \
  65     DO_FUNC(libhal_device_get_property_bool); \
  66     DO_FUNC(libhal_device_get_property_string); \
  67     DO_FUNC(libhal_device_add_property_watch); \
  68     DO_FUNC(libhal_device_remove_property_watch); \
  69     DO_FUNC(libhal_free_string); \
  70     DO_FUNC(libhal_free_string_array); \
  71     DO_FUNC(libhal_get_all_devices)
  72
  73 #define DO_FUNC(f) static typeof(f) * p_##f
  74 DBUS_FUNCS;
  75 HAL_FUNCS;
  76 #undef DO_FUNC
  77
  78 static BOOL load_functions(void)
  79 {
  80     void *hal_handle;
  81     char error[128];
  82
  83     /* Load libhal with RTLD_GLOBAL so that the dbus symbols are available.
  84      * We can't load libdbus directly since libhal may have been built against a
  85      * different version but with the same soname. Binary compatibility is for wimps. */
  86
  87     if (!(hal_handle = wine_dlopen(SONAME_LIBHAL, RTLD_NOW|RTLD_GLOBAL, error, sizeof(error))))
  88         goto failed;
  89
  90 #define DO_FUNC(f) if (!(p_##f = wine_dlsym( RTLD_DEFAULT, #f, error, sizeof(error) ))) goto failed
  91     DBUS_FUNCS;
  92 #undef DO_FUNC
  93
  94 #define DO_FUNC(f) if (!(p_##f = wine_dlsym( hal_handle, #f, error, sizeof(error) ))) goto failed
  95     HAL_FUNCS;
  96 #undef DO_FUNC
  97
  98     return TRUE;
  99
 100 failed:
 101     WINE_WARN( "failed to load HAL support: %s\n", error );
 102     return FALSE;
 103 }
 104
 105 static LONG WINAPI assert_fault(EXCEPTION_POINTERS *eptr)
 106 {
 107     if (eptr->ExceptionRecord->ExceptionCode == EXCEPTION_WINE_ASSERTION)
 108         return EXCEPTION_EXECUTE_HANDLER;
 109     return EXCEPTION_CONTINUE_SEARCH;
 110 }
 111
 112 /* HAL callback for new device */
 113 static void new_device( LibHalContext *ctx, const char *udi )
 114 {
 115     DBusError error;
 116     char *parent = NULL;
 117     char *mount_point = NULL;
 118     char *device = NULL;
 119     char *type = NULL;
 120
 121     p_dbus_error_init( &error );
 122
 123     if (!(device = p_libhal_device_get_property_string( ctx, udi, "block.device", &error )))
 124         goto done;
 125
 126     if (!(mount_point = p_libhal_device_get_property_string( ctx, udi, "volume.mount_point", &error )))
 127         goto done;
 128
 129     if (!(parent = p_libhal_device_get_property_string( ctx, udi, "info.parent", &error )))
 130         goto done;
 131
 132     if (!p_libhal_device_get_property_bool( ctx, parent, "storage.removable", &error ))
 133         goto done;
 134
 135     if (!(type = p_libhal_device_get_property_string( ctx, parent, "storage.drive_type", &error )))
 136         p_dbus_error_free( &error );  /* ignore error */
 137
 138     add_dos_device( udi, device, mount_point, type );
 139
 140     /* add property watch for mount point */
 141     p_libhal_device_add_property_watch( ctx, udi, &error );
 142
 143 done:
 144     if (type) p_libhal_free_string( type );
 145     if (parent) p_libhal_free_string( parent );
 146     if (device) p_libhal_free_string( device );
 147     if (mount_point) p_libhal_free_string( mount_point );
 148     p_dbus_error_free( &error );
 149 }
 150
 151 /* HAL callback for removed device */
 152 static void removed_device( LibHalContext *ctx, const char *udi )
 153 {
 154     DBusError error;
 155
 156     WINE_TRACE( "removed %s\n", wine_dbgstr_a(udi) );
 157
 158     if (remove_dos_device( udi ))
 159     {
 160         p_dbus_error_init( &error );
 161         p_libhal_device_remove_property_watch( ctx, udi, &error );
 162         p_dbus_error_free( &error );
 163     }
 164 }
 165
 166 /* HAL callback for property changes */
 167 static void property_modified (LibHalContext *ctx, const char *udi,
 168                                const char *key, dbus_bool_t is_removed, dbus_bool_t is_added)
 169 {
 170     WINE_TRACE( "udi %s key %s %s\n", wine_dbgstr_a(udi), wine_dbgstr_a(key),
 171                 is_added ? "added" : is_removed ? "removed" : "modified" );
 172
 173     if (!strcmp( key, "volume.mount_point" )) new_device( ctx, udi );
 174 }
 175
 176
 177 static DWORD WINAPI hal_thread( void *arg )
 178 {
 179     DBusError error;
 180     DBusConnection *dbc;
 181     LibHalContext *ctx;
 182     int i, num;
 183     char **list;
 184
 185     if (!(ctx = p_libhal_ctx_new())) return 1;
 186
 187     p_dbus_error_init( &error );
 188     if (!(dbc = p_dbus_bus_get( DBUS_BUS_SYSTEM, &error )))
 189     {
 190         WINE_WARN( "failed to get system dbus connection: %s\n", error.message );
 191         p_dbus_error_free( &error );
 192         return 1;
 193     }
 194
 195     p_libhal_ctx_set_dbus_connection( ctx, dbc );
 196     p_libhal_ctx_set_device_added( ctx, new_device );
 197     p_libhal_ctx_set_device_removed( ctx, removed_device );
 198     p_libhal_ctx_set_device_property_modified( ctx, property_modified );
 199
 200     if (!p_libhal_ctx_init( ctx, &error ))
 201     {
 202         WINE_WARN( "HAL context init failed: %s\n", error.message );
 203         p_dbus_error_free( &error );
 204         return 1;
 205     }
 206
 207     /* retrieve all existing devices */
 208     if (!(list = p_libhal_get_all_devices( ctx, &num, &error ))) p_dbus_error_free( &error );
 209     else
 210     {
 211         for (i = 0; i < num; i++) new_device( ctx, list[i] );
 212         p_libhal_free_string_array( list );
 213     }
 214
 215     __TRY
 216     {
 217         while (p_dbus_connection_read_write_dispatch( dbc, -1 )) /* nothing */ ;
 218     }
 219     __EXCEPT( assert_fault )
 220     {
 221         WINE_WARN( "dbus assertion failure, disabling HAL support\n" );
 222         return 1;
 223     }
 224     __ENDTRY;
 225
 226     p_libhal_ctx_shutdown( ctx, &error );
 227     p_dbus_error_free( &error );  /* just in case */
 228     p_dbus_connection_close( dbc );
 229     p_libhal_ctx_free( ctx );
 230     return 0;
 231 }
 232
 233 void initialize_hal(void)
 234 {
 235     HANDLE handle;
 236
 237     if (!load_functions()) return;
 238     if (!(handle = CreateThread( NULL, 0, hal_thread, NULL, 0, NULL ))) return;
 239     CloseHandle( handle );
 240 }
 241
 242 #else  /* SONAME_LIBHAL */
 243
 244 void initialize_hal(void)
 245 {
 246     WINE_TRACE( "Skipping, HAL support not compiled in\n" );
 247 }
 248
 249 #endif  /* SONAME_LIBHAL */