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/* dlfcn-dyld.c -- provides dlopen() and friends as wrappers around Mach dyld
*
* Author: Ian.Piumarta@INRIA.Fr
*
* Copyright (C) 1996-2006 by Ian Piumarta and other authors/contributors
* listed elsewhere in this file.
* All rights reserved.
*
* This file is part of Unix Squeak.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Last edited: 2009-08-19 04:17:17 by piumarta on emilia-2.local
*/
#include <stdio.h>
#include <stdarg.h>
#include <mach-o/dyld.h>
#define RTLD_NOW 0
#define RTLD_GLOBAL 0
#define DL_APP_CONTEXT ((void *)-1)
static char dlErrorString[256];
static int dlErrorSet= 0;
static void dlSetError(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vsnprintf(dlErrorString, sizeof(dlErrorString), fmt, ap);
va_end(ap);
dlErrorSet= 1;
}
static const char *dlerror(void)
{
if (dlErrorSet)
{
dlErrorSet= 0;
return (const char *)dlErrorString;
}
return 0;
}
static void dlUndefined(const char *symbol)
{
fprintf(stderr, "dyld: undefined symbol: %s\n", symbol);
}
static NSModule dlMultiple(NSSymbol s, NSModule oldModule, NSModule newModule)
{
fdebugf((stderr, "dyld: %s: %s previously defined in %s, new definition in %s\n",
NSNameOfSymbol(s), NSNameOfModule(oldModule), NSNameOfModule(newModule)));
return newModule;
}
static void dlLinkEdit(NSLinkEditErrors errorClass, int errorNumber,
const char *fileName, const char *errorString)
{
fprintf(stderr, "dyld: %s: %s\n", fileName, errorString);
}
static NSLinkEditErrorHandlers errorHandlers=
{
dlUndefined,
dlMultiple,
dlLinkEdit
};
static void dlinit(void)
{
NSInstallLinkEditErrorHandlers(&errorHandlers);
}
static int dlInitialised= 0;
static void *dlopen(const char *path, int mode)
{
void *handle= 0;
NSObjectFileImage ofi= 0;
if (!dlInitialised)
{
dlinit();
dlInitialised= 1;
}
if (!path)
return DL_APP_CONTEXT;
switch (NSCreateObjectFileImageFromFile(path, &ofi))
{
case NSObjectFileImageSuccess:
handle= NSLinkModule(ofi, path, NSLINKMODULE_OPTION_RETURN_ON_ERROR);
NSDestroyObjectFileImage(ofi);
break;
case NSObjectFileImageInappropriateFile:
handle= (void *)NSAddImage(path, NSADDIMAGE_OPTION_RETURN_ON_ERROR);
break;
default:
handle= 0;
break;
}
if (!handle)
dlSetError("could not load shared object: %s", path);
fdebugf((stderr, "dlopen: %s => %d\n", path, (int)handle));
return handle;
}
static void *dlsym(void *handle, const char *symbol)
{
char _symbol[256];
NSSymbol *nsSymbol= 0;
snprintf(_symbol, sizeof(_symbol), "_%s", symbol);
fdebugf((stderr, "dlsym: looking for %s (%s) in %d\n", symbol, _symbol, (int)handle));
if (!handle)
{
fdebugf((stderr, "dlsym: setting app context for this handle\n"));
handle= DL_APP_CONTEXT;
}
if (DL_APP_CONTEXT == handle)
{
fdebugf((stderr, "dlsym: looking in app context\n"));
if (NSIsSymbolNameDefined(_symbol))
nsSymbol= NSLookupAndBindSymbol(_symbol);
}
else
{
if (( (MH_MAGIC == ((struct mach_header *)handle)->magic)) /* ppc */
|| (MH_CIGAM == ((struct mach_header *)handle)->magic)) /* 386 */
{
if (NSIsSymbolNameDefinedInImage((struct mach_header *)handle, _symbol))
{
nsSymbol= NSLookupSymbolInImage
((struct mach_header *)handle,
_symbol,
NSLOOKUPSYMBOLINIMAGE_OPTION_BIND
/*| NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR*/);
fdebugf((stderr, "dlsym: bundle (image) lookup returned %p\n", nsSymbol));
}
else
fdebugf((stderr, "dlsym: bundle (image) symbol not defined\n"));
}
else
{
nsSymbol= NSLookupSymbolInModule(handle, _symbol);
fdebugf((stderr, "dlsym: dylib (module) lookup returned %p\n", nsSymbol));
}
}
if (!nsSymbol)
{
dlSetError("symbol not found: %s", _symbol);
return 0;
}
return NSAddressOfSymbol(nsSymbol);
}
static int dlclose(void *handle)
{
if (( (MH_MAGIC == ((struct mach_header *)handle)->magic)) /* ppc */
|| (MH_CIGAM == ((struct mach_header *)handle)->magic)) /* 386 */
return 0; /* can't unlink, but pretend we did */
if (!NSUnLinkModule(handle, 0))
{
dlSetError("could not unlink shared object: %s", NSNameOfModule(handle));
return -1;
}
return 0;
}
/* autoconf has bugs */
#ifdef HAVE_DLFCN_H
# undef HAVE_DLFCN_H
#endif
#ifndef HAVE_DLOPEN
# define HAVE_DLOPEN 1
#endif
|
