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206 lines
6.2 KiB
C
206 lines
6.2 KiB
C
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/** @file vbox_XPCOMCGlue.c
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* Glue code for dynamically linking to VBoxXPCOMC.
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*/
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/*
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* Copyright (C) 2008-2009 Sun Microsystems, Inc.
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*
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* This file is part of a free software library; you can redistribute
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* it and/or modify it under the terms of the GNU Lesser General
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* Public License version 2.1 as published by the Free Software
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* Foundation and shipped in the "COPYING" file with this library.
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* The library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY of any kind.
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*
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* Sun LGPL Disclaimer: For the avoidance of doubt, except that if
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* any license choice other than GPL or LGPL is available it will
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* apply instead, Sun elects to use only the Lesser General Public
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* License version 2.1 (LGPLv2) at this time for any software where
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* a choice of LGPL license versions is made available with the
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* language indicating that LGPLv2 or any later version may be used,
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* or where a choice of which version of the LGPL is applied is
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* otherwise unspecified.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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* Clara, CA 95054 USA or visit http://www.sun.com if you need
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* additional information or have any questions.
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*/
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/*******************************************************************************
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* Header Files *
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*******************************************************************************/
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#ifdef LIBVIRT_VERSION
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# include <config.h>
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#endif /* LIBVIRT_VERSION */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <dlfcn.h>
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#include "vbox_XPCOMCGlue.h"
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/*******************************************************************************
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* Defined Constants And Macros *
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*******************************************************************************/
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#if defined(__linux__) || defined(__linux_gnu__) || defined(__sun__) || defined(__FreeBSD__)
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# define DYNLIB_NAME "VBoxXPCOMC.so"
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#elif defined(__APPLE__)
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# define DYNLIB_NAME "VBoxXPCOMC.dylib"
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#elif defined(_MSC_VER) || defined(__OS2__)
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# define DYNLIB_NAME "VBoxXPCOMC.dll"
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#else
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# error "Port me"
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#endif
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/*******************************************************************************
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* Global Variables *
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*******************************************************************************/
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/** The dlopen handle for VBoxXPCOMC. */
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void *g_hVBoxXPCOMC = NULL;
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/** The last load error. */
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PCVBOXXPCOM g_pVBoxFuncs = NULL;
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/** Pointer to VBoxGetXPCOMCFunctions for the loaded VBoxXPCOMC so/dylib/dll. */
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PFNVBOXGETXPCOMCFUNCTIONS g_pfnGetFunctions = NULL;
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/**
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* Try load VBoxXPCOMC.so/dylib/dll from the specified location and resolve all
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* the symbols we need.
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*
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* @returns 0 on success, -1 on failure.
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* @param pszHome The director where to try load VBoxXPCOMC from. Can be NULL.
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* @param fSetAppHome Whether to set the VBOX_APP_HOME env.var. or not (boolean).
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*/
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static int tryLoadOne(const char *pszHome, int fSetAppHome)
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{
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size_t cchHome = pszHome ? strlen(pszHome) : 0;
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size_t cbBufNeeded;
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char szBuf[4096];
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int rc = -1;
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/*
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* Construct the full name.
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*/
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cbBufNeeded = cchHome + sizeof("/" DYNLIB_NAME);
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if (cbBufNeeded > sizeof(szBuf))
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{
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return -1;
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}
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if (cchHome)
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{
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memcpy(szBuf, pszHome, cchHome);
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szBuf[cchHome] = '/';
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cchHome++;
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}
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memcpy(&szBuf[cchHome], DYNLIB_NAME, sizeof(DYNLIB_NAME));
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/*
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* Try load it by that name, setting the VBOX_APP_HOME first (for now).
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* Then resolve and call the function table getter.
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*/
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if (fSetAppHome)
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{
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if (pszHome)
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setenv("VBOX_APP_HOME", pszHome, 1 /* always override */);
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else
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unsetenv("VBOX_APP_HOME");
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}
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g_hVBoxXPCOMC = dlopen(szBuf, RTLD_NOW | RTLD_LOCAL);
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if (g_hVBoxXPCOMC)
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{
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PFNVBOXGETXPCOMCFUNCTIONS pfnGetFunctions;
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pfnGetFunctions = (PFNVBOXGETXPCOMCFUNCTIONS)
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dlsym(g_hVBoxXPCOMC, VBOX_GET_XPCOMC_FUNCTIONS_SYMBOL_NAME);
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if (pfnGetFunctions)
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{
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g_pVBoxFuncs = pfnGetFunctions(VBOX_XPCOMC_VERSION);
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if (g_pVBoxFuncs)
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{
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g_pfnGetFunctions = pfnGetFunctions;
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rc = 0;
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}
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}
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if (rc != 0)
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{
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dlclose(g_hVBoxXPCOMC);
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g_hVBoxXPCOMC = NULL;
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}
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}
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return rc;
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}
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/**
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* Tries to locate and load VBoxXPCOMC.so/dylib/dll, resolving all the related
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* function pointers.
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*
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* @returns 0 on success, -1 on failure.
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*
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* @remark This should be considered moved into a separate glue library since
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* its its going to be pretty much the same for any user of VBoxXPCOMC
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* and it will just cause trouble to have duplicate versions of this
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* source code all around the place.
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*/
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int VBoxCGlueInit(void)
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{
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/*
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* If the user specifies the location, try only that.
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*/
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const char *pszHome = getenv("VBOX_APP_HOME");
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if (pszHome)
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return tryLoadOne(pszHome, 0);
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/*
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* Try the known standard locations.
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*/
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#if defined(__gnu__linux__) || defined(__linux__)
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if (tryLoadOne("/opt/VirtualBox", 1) == 0)
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return 0;
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if (tryLoadOne("/usr/lib/virtualbox", 1) == 0)
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return 0;
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#elif defined(__sun__)
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if (tryLoadOne("/opt/VirtualBox/amd64", 1) == 0)
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return 0;
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if (tryLoadOne("/opt/VirtualBox/i386", 1) == 0)
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return 0;
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#elif defined(__APPLE__)
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if (tryLoadOne("/Application/VirtualBox.app/Contents/MacOS", 1) == 0)
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return 0;
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#elif defined(__FreeBSD__)
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if (tryLoadOne("/usr/local/lib/virtualbox", 1) == 0)
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return 0;
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#else
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# error "port me"
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#endif
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/*
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* Finally try the dynamic linker search path.
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*/
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if (tryLoadOne(NULL, 1) == 0)
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return 0;
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/* No luck, return failure. */
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return -1;
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}
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/**
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* Terminate the C glue library.
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*/
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void VBoxCGlueTerm(void)
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{
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if (g_hVBoxXPCOMC)
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{
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#if 0 /* VBoxRT.so doesn't like being reloaded. See @bugref{3725}. */
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dlclose(g_hVBoxXPCOMC);
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#endif
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g_hVBoxXPCOMC = NULL;
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}
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g_pVBoxFuncs = NULL;
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g_pfnGetFunctions = NULL;
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}
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