dlls/mountmgr.sys/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 "mountmgr.h"
  31 #include "excpt.h"
  32
  33 #include "wine/library.h"
  34 #include "wine/exception.h"
  35 #include "wine/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(mountmgr);
  38
  39 #ifdef SONAME_LIBHAL
  40
  41 #include <dbus/dbus.h>
  42 #include <hal/libhal.h>
  43
  44 #define DBUS_FUNCS \
  45     DO_FUNC(dbus_bus_get); \
  46     DO_FUNC(dbus_connection_close); \
  47     DO_FUNC(dbus_connection_read_write_dispatch); \
  48     DO_FUNC(dbus_error_init); \
  49     DO_FUNC(dbus_error_free); \
  50     DO_FUNC(dbus_error_is_set)
  51
  52 #define HAL_FUNCS \
  53     DO_FUNC(libhal_ctx_free); \
  54     DO_FUNC(libhal_ctx_init); \
  55     DO_FUNC(libhal_ctx_new); \
  56     DO_FUNC(libhal_ctx_set_dbus_connection); \
  57     DO_FUNC(libhal_ctx_set_device_added); \
  58     DO_FUNC(libhal_ctx_set_device_property_modified); \
  59     DO_FUNC(libhal_ctx_set_device_removed); \
  60     DO_FUNC(libhal_ctx_shutdown); \
  61     DO_FUNC(libhal_device_get_property_bool); \
  62     DO_FUNC(libhal_device_get_property_string); \
  63     DO_FUNC(libhal_device_add_property_watch); \
  64     DO_FUNC(libhal_device_remove_property_watch); \
  65     DO_FUNC(libhal_free_string); \
  66     DO_FUNC(libhal_free_string_array); \
  67     DO_FUNC(libhal_get_all_devices)
  68
  69 #define DO_FUNC(f) static typeof(f) * p_##f
  70 DBUS_FUNCS;
  71 HAL_FUNCS;
  72 #undef DO_FUNC
  73
  74 static BOOL load_functions(void)
  75 {
  76     void *hal_handle;
  77     char error[128];
  78
  79     /* Load libhal with RTLD_GLOBAL so that the dbus symbols are available.
  80      * We can't load libdbus directly since libhal may have been built against a
  81      * different version but with the same soname. Binary compatibility is for wimps. */
  82
  83     if (!(hal_handle = wine_dlopen(SONAME_LIBHAL, RTLD_NOW|RTLD_GLOBAL, error, sizeof(error))))
  84         goto failed;
  85
  86 #define DO_FUNC(f) if (!(p_##f = wine_dlsym( RTLD_DEFAULT, #f, error, sizeof(error) ))) goto failed
  87     DBUS_FUNCS;
  88 #undef DO_FUNC
  89
  90 #define DO_FUNC(f) if (!(p_##f = wine_dlsym( hal_handle, #f, error, sizeof(error) ))) goto failed
  91     HAL_FUNCS;
  92 #undef DO_FUNC
  93
  94     return TRUE;
  95
  96 failed:
  97     WARN( "failed to load HAL support: %s\n", error );
  98     return FALSE;
  99 }
 100
 101 static LONG WINAPI assert_fault(EXCEPTION_POINTERS *eptr)
 102 {
 103     if (eptr->ExceptionRecord->ExceptionCode == EXCEPTION_WINE_ASSERTION)
 104         return EXCEPTION_EXECUTE_HANDLER;
 105     return EXCEPTION_CONTINUE_SEARCH;
 106 }
 107
 108 /* HAL callback for new device */
 109 static void new_device( LibHalContext *ctx, const char *udi )
 110 {
 111     DBusError error;
 112     char *parent = NULL;
 113     char *mount_point = NULL;
 114     char *device = NULL;
 115     char *type = NULL;
 116     enum device_type drive_type;
 117
 118     p_dbus_error_init( &error );
 119
 120     if (!(device = p_libhal_device_get_property_string( ctx, udi, "block.device", &error )))
 121         goto done;
 122
 123     if (!(mount_point = p_libhal_device_get_property_string( ctx, udi, "volume.mount_point", &error )))
 124         goto done;
 125
 126     if (!(parent = p_libhal_device_get_property_string( ctx, udi, "info.parent", &error )))
 127         goto done;
 128
 129     if (!p_libhal_device_get_property_bool( ctx, parent, "storage.removable", &error ))
 130         goto done;
 131
 132     if (!(type = p_libhal_device_get_property_string( ctx, parent, "storage.drive_type", &error )))
 133         p_dbus_error_free( &error );  /* ignore error */
 134
 135     if (type && !strcmp( type, "cdrom" )) drive_type = DEVICE_CDROM;
 136     else if (type && !strcmp( type, "floppy" )) drive_type = DEVICE_FLOPPY;
 137     else drive_type = DEVICE_UNKNOWN;
 138
 139     add_dos_device( -1, udi, device, mount_point, drive_type );
 140
 141     /* add property watch for mount point */
 142     p_libhal_device_add_property_watch( ctx, udi, &error );
 143
 144 done:
 145     if (type) p_libhal_free_string( type );
 146     if (parent) p_libhal_free_string( parent );
 147     if (device) p_libhal_free_string( device );
 148     if (mount_point) p_libhal_free_string( mount_point );
 149     p_dbus_error_free( &error );
 150 }
 151
 152 /* HAL callback for removed device */
 153 static void removed_device( LibHalContext *ctx, const char *udi )
 154 {
 155     DBusError error;
 156
 157     TRACE( "removed %s\n", wine_dbgstr_a(udi) );
 158
 159     if (!remove_dos_device( -1, udi ))
 160     {
 161         p_dbus_error_init( &error );
 162         p_libhal_device_remove_property_watch( ctx, udi, &error );
 163         p_dbus_error_free( &error );
 164     }
 165 }
 166
 167 /* HAL callback for property changes */
 168 static void property_modified (LibHalContext *ctx, const char *udi,
 169                                const char *key, dbus_bool_t is_removed, dbus_bool_t is_added)
 170 {
 171     TRACE( "udi %s key %s %s\n", wine_dbgstr_a(udi), wine_dbgstr_a(key),
 172                 is_added ? "added" : is_removed ? "removed" : "modified" );
 173
 174     if (!strcmp( key, "volume.mount_point" )) new_device( ctx, udi );
 175 }
 176
 177
 178 static DWORD WINAPI hal_thread( void *arg )
 179 {
 180     DBusError error;
 181     DBusConnection *dbc;
 182     LibHalContext *ctx;
 183     int i, num;
 184     char **list;
 185
 186     if (!(ctx = p_libhal_ctx_new())) return 1;
 187
 188     p_dbus_error_init( &error );
 189     if (!(dbc = p_dbus_bus_get( DBUS_BUS_SYSTEM, &error )))
 190     {
 191         WARN( "failed to get system dbus connection: %s\n", error.message );
 192         p_dbus_error_free( &error );
 193         return 1;
 194     }
 195
 196     p_libhal_ctx_set_dbus_connection( ctx, dbc );
 197     p_libhal_ctx_set_device_added( ctx, new_device );
 198     p_libhal_ctx_set_device_removed( ctx, removed_device );
 199     p_libhal_ctx_set_device_property_modified( ctx, property_modified );
 200
 201     if (!p_libhal_ctx_init( ctx, &error ))
 202     {
 203         WARN( "HAL context init failed: %s\n", error.message );
 204         p_dbus_error_free( &error );
 205         return 1;
 206     }
 207
 208     /* retrieve all existing devices */
 209     if (!(list = p_libhal_get_all_devices( ctx, &num, &error ))) p_dbus_error_free( &error );
 210     else
 211     {
 212         for (i = 0; i < num; i++) new_device( ctx, list[i] );
 213         p_libhal_free_string_array( list );
 214     }
 215
 216     __TRY
 217     {
 218         while (p_dbus_connection_read_write_dispatch( dbc, -1 )) /* nothing */ ;
 219     }
 220     __EXCEPT( assert_fault )
 221     {
 222         WARN( "dbus assertion failure, disabling HAL support\n" );
 223         return 1;
 224     }
 225     __ENDTRY;
 226
 227     p_libhal_ctx_shutdown( ctx, &error );
 228     p_dbus_error_free( &error );  /* just in case */
 229     p_dbus_connection_close( dbc );
 230     p_libhal_ctx_free( ctx );
 231     return 0;
 232 }
 233
 234 void initialize_hal(void)
 235 {
 236     HANDLE handle;
 237
 238     if (!load_functions()) return;
 239     if (!(handle = CreateThread( NULL, 0, hal_thread, NULL, 0, NULL ))) return;
 240     CloseHandle( handle );
 241 }
 242
 243 #else  /* SONAME_LIBHAL */
 244
 245 void initialize_hal(void)
 246 {
 247     TRACE( "Skipping, HAL support not compiled in\n" );
 248 }
 249
 250 #endif  /* SONAME_LIBHAL */