gecko/xpcom/glue/standalone/nsGlueLinkingDlopen.cpp

167 lines
4.5 KiB
C++

/* -*- Mode: C++; tab-width: 6; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla XPCOM.
*
* The Initial Developer of the Original Code is
* Benjamin Smedberg <benjamin@smedbergs.us>
*
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsGlueLinking.h"
#include "nsXPCOMGlue.h"
#include <dlfcn.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#if defined(SUNOS4) || defined(NEXTSTEP) || \
(defined(OPENBSD) || defined(NETBSD)) && !defined(__ELF__)
#define LEADING_UNDERSCORE "_"
#else
#define LEADING_UNDERSCORE
#endif
struct DependentLib
{
void *libHandle;
DependentLib *next;
};
static DependentLib *sTop;
static void* sXULLibHandle;
static void
AppendDependentLib(void *libHandle)
{
DependentLib *d = new DependentLib;
if (!d)
return;
d->next = sTop;
d->libHandle = libHandle;
sTop = d;
}
static void
ReadDependentCB(const char *aDependentLib)
{
void *libHandle = dlopen(aDependentLib, RTLD_GLOBAL | RTLD_LAZY);
if (!libHandle)
return;
AppendDependentLib(libHandle);
}
nsresult
XPCOMGlueLoad(const char *xpcomFile, GetFrozenFunctionsFunc *func)
{
char xpcomDir[MAXPATHLEN];
if (realpath(xpcomFile, xpcomDir)) {
char *lastSlash = strrchr(xpcomDir, '/');
if (lastSlash) {
*lastSlash = '\0';
XPCOMGlueLoadDependentLibs(xpcomDir, ReadDependentCB);
snprintf(lastSlash, MAXPATHLEN - strlen(xpcomDir), "/" XUL_DLL);
sXULLibHandle = dlopen(xpcomDir, RTLD_GLOBAL | RTLD_LAZY);
}
}
// RTLD_DEFAULT is not defined in non-GNU toolchains, and it is
// (void*) 0 in any case.
void *libHandle = nsnull;
if (xpcomFile[0] != '.' || xpcomFile[1] != '\0') {
libHandle = dlopen(xpcomFile, RTLD_GLOBAL | RTLD_LAZY);
if (libHandle) {
AppendDependentLib(libHandle);
}
}
GetFrozenFunctionsFunc sym =
(GetFrozenFunctionsFunc) dlsym(libHandle,
LEADING_UNDERSCORE "NS_GetFrozenFunctions");
if (!sym) { // No symbol found.
XPCOMGlueUnload();
return NS_ERROR_NOT_AVAILABLE;
}
*func = sym;
return NS_OK;
}
void
XPCOMGlueUnload()
{
while (sTop) {
dlclose(sTop->libHandle);
DependentLib *temp = sTop;
sTop = sTop->next;
delete temp;
}
if (sXULLibHandle) {
dlclose(sXULLibHandle);
sXULLibHandle = nsnull;
}
}
nsresult
XPCOMGlueLoadXULFunctions(const nsDynamicFunctionLoad *symbols)
{
// We don't null-check sXULLibHandle because this might work even
// if it is null (same as RTLD_DEFAULT)
nsresult rv = NS_OK;
while (symbols->functionName) {
char buffer[512];
snprintf(buffer, sizeof(buffer),
LEADING_UNDERSCORE "%s", symbols->functionName);
*symbols->function = (NSFuncPtr) dlsym(sXULLibHandle, buffer);
if (!*symbols->function)
rv = NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;
++symbols;
}
return rv;
}