vbox-libhal.cpp revision c58f1213e628a545081c70e26c6b67a841cff880
/** @file
*
* Module to dynamically load libhal and libdbus and load all symbols
* which are needed by VirtualBox.
*/
/*
* Copyright (C) 2006-2010 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
#include "vbox-libhal.h"
#include <iprt/err.h>
#include <iprt/ldr.h>
/**
* Whether we have tried to load libdbus and libhal yet. This flag should only be set
* to "true" after we have either loaded both libraries and all symbols which we need,
* or failed to load something and unloaded and set back to zero pLibDBus and pLibHal.
*/
static bool gCheckedForLibHal = false;
/**
* Pointer to the libhal shared object. This should only be set once all needed libraries
* and symbols have been successfully loaded.
*/
static RTLDRMOD ghLibHal = 0;
/** The following are the symbols which we need from libdbus and libhal. */
void (*gDBusErrorInit)(DBusError *);
DBusConnection *(*gDBusBusGet)(DBusBusType, DBusError *);
void (*gDBusErrorFree)(DBusError *);
void (*gDBusConnectionUnref)(DBusConnection *);
LibHalContext *(*gLibHalCtxNew)(void);
dbus_bool_t (*gLibHalCtxSetDBusConnection)(LibHalContext *, DBusConnection *);
dbus_bool_t (*gLibHalCtxInit)(LibHalContext *, DBusError *);
char **(*gLibHalFindDeviceStringMatch)(LibHalContext *, const char *, const char *, int *,
DBusError *);
char *(*gLibHalDeviceGetPropertyString)(LibHalContext *, const char *, const char *, DBusError *);
void (*gLibHalFreeString)(char *);
void (*gLibHalFreeStringArray)(char **);
dbus_bool_t (*gLibHalCtxShutdown)(LibHalContext *, DBusError *);
dbus_bool_t (*gLibHalCtxFree)(LibHalContext *);
bool gLibHalCheckPresence(void)
{
RTLDRMOD hLibHal;
if (ghLibHal != 0 && gCheckedForLibHal == true)
return true;
if (gCheckedForLibHal == true)
return false;
if (!RT_SUCCESS(RTLdrLoad(LIB_HAL, &hLibHal)))
{
return false;
}
if ( RT_SUCCESS(RTLdrGetSymbol(hLibHal, "dbus_error_init", (void **) &gDBusErrorInit))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "dbus_bus_get", (void **) &gDBusBusGet))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "dbus_error_free", (void **) &gDBusErrorFree))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "dbus_connection_unref",
(void **) &gDBusConnectionUnref))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_new", (void **) &gLibHalCtxNew))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_set_dbus_connection",
(void **) &gLibHalCtxSetDBusConnection))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_init", (void **) &gLibHalCtxInit))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_manager_find_device_string_match",
(void **) &gLibHalFindDeviceStringMatch))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_device_get_property_string",
(void **) &gLibHalDeviceGetPropertyString))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_free_string", (void **) &gLibHalFreeString))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_free_string_array",
(void **) &gLibHalFreeStringArray))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_shutdown", (void **) &gLibHalCtxShutdown))
&& RT_SUCCESS(RTLdrGetSymbol(hLibHal, "libhal_ctx_free", (void **) &gLibHalCtxFree))
)
{
ghLibHal = hLibHal;
gCheckedForLibHal = true;
return true;
}
else
{
RTLdrClose(hLibHal);
gCheckedForLibHal = true;
return false;
}
}