--- /dev/null
+++ dyld/dyld-44.4/src/dyldAPIsInLibSystem.cpp
@@ -0,0 +1,1133 @@
+/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
+ *
+ * Copyright (c) 2004-2005 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include <stddef.h>
+#include <string.h>
+#include <crt_externs.h>
+
+#include "mach-o/dyld.h"
+#include "mach-o/dyld_priv.h"
+
+#include "dyldLock.h"
+
+/*
+ * names_match() takes an install_name from an LC_LOAD_DYLIB command and a
+ * libraryName (which is -lx or -framework Foo argument passed to the static
+ * link editor for the same library) and determines if they match.  This depends
+ * on conventional use of names including major versioning.
+ */
+static
+bool
+names_match(
+char *install_name,
+const char* libraryName)
+{
+    char *basename;
+    unsigned long n;
+
+	/*
+	 * Conventional install names have these forms:
+	 *	/System/Library/Frameworks/AppKit.framework/Versions/A/Appkit
+	 *	/Local/Library/Frameworks/AppKit.framework/Appkit
+	 *	/lib/libsys_s.A.dylib
+	 *	/usr/lib/libsys_s.dylib
+	 */
+	basename = strrchr(install_name, '/');
+	if(basename == NULL)
+	    basename = install_name;
+	else
+	    basename++;
+
+	/*
+	 * By checking the base name matching the library name we take care
+	 * of the -framework cases.
+	 */
+	if(strcmp(basename, libraryName) == 0)
+	    return(TRUE);
+
+	/*
+	 * Now check the base name for "lib" if so proceed to check for the
+	 * -lx case dealing with a possible .X.dylib and a .dylib extension.
+	 */
+	if(strncmp(basename, "lib", 3) ==0){
+	    n = strlen(libraryName);
+	    if(strncmp(basename+3, libraryName, n) == 0){
+		if(strncmp(basename+3+n, ".dylib", 6) == 0)
+		    return(TRUE);
+		if(basename[3+n] == '.' &&
+		   basename[3+n+1] != '\0' &&
+		   strncmp(basename+3+n+2, ".dylib", 6) == 0)
+		    return(TRUE);
+	    }
+	}
+	return(FALSE);
+}
+
+void NSInstallLinkEditErrorHandlers(
+const NSLinkEditErrorHandlers* handlers)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static void (*p)(
+	void     (*undefined)(const char* symbol_name),
+	NSModule (*multiple)(NSSymbol s, NSModule old, NSModule newhandler),
+	void     (*linkEdit)(NSLinkEditErrors c, int errorNumber,
+		     const char* fileName, const char* errorString)) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_install_handlers", (void**)&p);
+	p(handlers->undefined, handlers->multiple, handlers->linkEdit);
+}
+
+const char* 
+NSNameOfModule(
+NSModule module)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static const char*  (*p)(NSModule module) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSNameOfModule", (void**)&p);
+	return(p(module));
+} 
+
+const char* 
+NSLibraryNameForModule(
+NSModule module)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static const char*  (*p)(NSModule module) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSLibraryNameForModule", (void**)&p);
+	return(p(module));
+}
+
+bool
+NSIsSymbolNameDefined(
+const char* symbolName)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static bool (*p)(const char* symbolName) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSIsSymbolNameDefined", (void**)&p);
+	return(p(symbolName));
+}
+
+bool
+NSIsSymbolNameDefinedWithHint(
+const char* symbolName,
+const char* libraryNameHint)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static bool (*p)(const char* symbolName,
+			  const char* libraryNameHint) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSIsSymbolNameDefinedWithHint", (void**)&p);
+	return(p(symbolName, libraryNameHint));
+}
+
+bool
+NSIsSymbolNameDefinedInImage(
+const struct mach_header *image,
+const char* symbolName)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static bool (*p)(const struct mach_header *image,
+			  const char* symbolName) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSIsSymbolNameDefinedInImage", (void**)&p);
+	return(p(image, symbolName));
+}
+
+NSSymbol
+NSLookupAndBindSymbol(
+const char* symbolName)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static NSSymbol (*p)(const char* symbolName) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSLookupAndBindSymbol", (void**)&p);
+	return(p(symbolName));
+}
+
+NSSymbol
+NSLookupAndBindSymbolWithHint(
+const char* symbolName,
+const char* libraryNameHint)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static NSSymbol (*p)(const char* symbolName,
+			 const char* libraryNameHint) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSLookupAndBindSymbolWithHint", (void**)&p);
+	return(p(symbolName, libraryNameHint));
+}
+
+NSSymbol
+NSLookupSymbolInModule(
+NSModule module,
+const char* symbolName)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static NSSymbol (*p)(NSModule module, const char* symbolName) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSLookupSymbolInModule", (void**)&p);
+	return(p(module, symbolName));
+}
+
+NSSymbol
+NSLookupSymbolInImage(
+const struct mach_header *image,
+const char* symbolName,
+uint32_t options)
+{
+ 	DYLD_READER_LOCK_THIS_BLOCK;
+   static NSSymbol (*p)(const struct mach_header *image,
+			 const char* symbolName,
+			 uint32_t options) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSLookupSymbolInImage", (void**)&p);
+	return(p(image, symbolName, options));
+}
+
+const char* 
+NSNameOfSymbol(
+NSSymbol symbol)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static char * (*p)(NSSymbol symbol) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSNameOfSymbol",(void**)&p);
+	return(p(symbol));
+}
+
+void *
+NSAddressOfSymbol(
+NSSymbol symbol)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static void * (*p)(NSSymbol symbol) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSAddressOfSymbol", (void**)&p);
+	return(p(symbol));
+}
+
+NSModule
+NSModuleForSymbol(
+NSSymbol symbol)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static NSModule (*p)(NSSymbol symbol) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSModuleForSymbol", (void**)&p);
+	return(p(symbol));
+}
+
+bool
+NSAddLibrary(
+const char* pathName)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static bool (*p)(const char* pathName) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSAddLibrary", (void**)&p);
+	return(p(pathName));
+}
+
+bool
+NSAddLibraryWithSearching(
+const char* pathName)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static bool (*p)(const char* pathName) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSAddLibraryWithSearching", (void**)&p);
+	return(p(pathName));
+}
+
+const struct mach_header *
+NSAddImage(
+const char* image_name,
+uint32_t options)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static const struct mach_header * (*p)(const char* image_name,
+					   uint32_t options) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSAddImage", (void**)&p);
+	return(p(image_name, options));
+}
+
+/*
+ * This routine returns the current version of the named shared library the
+ * executable it was built with.  The libraryName parameter is the same as the
+ * -lx or -framework Foo argument passed to the static link editor when building
+ * the executable (with -lx it would be "x" and with -framework Foo it would be
+ * "Foo").  If this the executable was not built against the specified library
+ * it returns -1.  It should be noted that if this only returns the value the
+ * current version of the named shared library the executable was built with
+ * and not a list of current versions that dependent libraries and bundles the
+ * program is using were built with.
+ */
+int32_t
+NSVersionOfLinkTimeLibrary(
+const char* libraryName)
+{
+    unsigned long i;
+    struct load_command *load_commands, *lc;
+    struct dylib_command *dl;
+    char *install_name;
+#ifndef __OPENSTEP__
+    static struct mach_header *mh = NULL;
+	if(mh == NULL)
+	    mh = _NSGetMachExecuteHeader();
+#else /* defined(__OPENSTEP__) */
+#ifdef __DYNAMIC__
+    static struct mach_header *mh = NULL;
+	if(mh == NULL)
+	    _dyld_lookup_and_bind("__mh_execute_header", &mh, NULL);
+#else
+    struct mach_header *mh;
+	mh = (struct mach_header *)&_mh_execute_header;
+#endif
+#endif /* __OPENSTEP__ */
+	load_commands = (struct load_command *)
+			((char *)mh + sizeof(struct mach_header));
+	lc = load_commands;
+	for(i = 0; i < mh->ncmds; i++){
+	    if(lc->cmd == LC_LOAD_DYLIB){
+		dl = (struct dylib_command *)lc;
+		install_name = (char *)dl + dl->dylib.name.offset;
+		if(names_match(install_name, libraryName) == TRUE)
+		    return(dl->dylib.current_version);
+	    }
+	    lc = (struct load_command *)((char *)lc + lc->cmdsize);
+	}
+	return(-1);
+}
+
+/*
+ * This routine returns the current version of the named shared library the
+ * program it is running against.  The libraryName parameter is the same as
+ * would be static link editor using the -lx or -framework Foo flags (with -lx
+ * it would be "x" and with -framework Foo it would be "Foo").  If the program
+ * is not using the specified library it returns -1.
+ */
+int32_t
+NSVersionOfRunTimeLibrary(
+const char* libraryName)
+{
+    unsigned long i, j, n;
+    char *install_name;
+    struct load_command *load_commands, *lc;
+    struct dylib_command *dl;
+    const struct mach_header *mh;
+
+	n = _dyld_image_count();
+	for(i = 0; i < n; i++){
+	    mh = _dyld_get_image_header(i);
+	    if(mh->filetype != MH_DYLIB)
+		continue;
+	    load_commands = (struct load_command *)
+			    ((char *)mh + sizeof(struct mach_header));
+	    lc = load_commands;
+	    for(j = 0; j < mh->ncmds; j++){
+		if(lc->cmd == LC_ID_DYLIB){
+		    dl = (struct dylib_command *)lc;
+		    install_name = (char *)dl + dl->dylib.name.offset;
+		    if(names_match(install_name, libraryName) == TRUE)
+			return(dl->dylib.current_version);
+		}
+		lc = (struct load_command *)((char *)lc + lc->cmdsize);
+	    }
+	}
+	return(-1);
+}
+
+/*
+ * NSCreateObjectFileImageFromFile() creates an NSObjectFileImage for the
+ * specified file name if the file is a correct Mach-O file that can be loaded
+ * with NSloadModule().  For return codes of NSObjectFileImageFailure and
+ * NSObjectFileImageFormat an error message is printed to stderr.  All
+ * other codes cause no printing. 
+ */
+NSObjectFileImageReturnCode
+NSCreateObjectFileImageFromFile(
+const char* pathName,
+NSObjectFileImage *objectFileImage)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static NSObjectFileImageReturnCode (*p)(const char*, NSObjectFileImage*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSCreateObjectFileImageFromFile", (void**)&p);
+	return p(pathName, objectFileImage);
+}
+
+
+/*
+ * NSCreateObjectFileImageFromMemory() creates an NSObjectFileImage for the
+ * object file mapped into memory at address of size length if the object file
+ * is a correct Mach-O file that can be loaded with NSloadModule().  For return
+ * codes of NSObjectFileImageFailure and NSObjectFileImageFormat an error
+ * message is printed to stderr.  All other codes cause no printing. 
+ */
+NSObjectFileImageReturnCode
+NSCreateObjectFileImageFromMemory(
+const void* address,
+size_t size, 
+NSObjectFileImage *objectFileImage)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static NSObjectFileImageReturnCode (*p)(const void*, size_t, NSObjectFileImage*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSCreateObjectFileImageFromMemory", (void**)&p);
+	return p(address, size, objectFileImage);
+}
+
+/*
+ * NSCreateCoreFileImageFromFile() creates an NSObjectFileImage for the 
+ * specified core file name if the file is a correct Mach-O core file.
+ * For return codes of NSObjectFileImageFailure and NSObjectFileImageFormat
+ * an error message is printed to stderr.  All other codes cause no printing. 
+ */
+NSObjectFileImageReturnCode
+NSCreateCoreFileImageFromFile(
+const char* pathName,
+NSObjectFileImage *objectFileImage)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static NSObjectFileImageReturnCode (*p)(const char*, NSObjectFileImage*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSCreateCoreFileImageFromFile", (void**)&p);
+	return p(pathName, objectFileImage);
+}
+
+bool
+NSDestroyObjectFileImage(
+NSObjectFileImage objectFileImage)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static bool (*p)(NSObjectFileImage) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSDestroyObjectFileImage", (void**)&p);
+	return p(objectFileImage);
+}
+
+
+NSModule
+NSLinkModule(
+NSObjectFileImage objectFileImage, 
+const char* moduleName,
+uint32_t options)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static NSModule (*p)(NSObjectFileImage, const char*, unsigned long) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSLinkModule", (void**)&p);
+		
+	return p(objectFileImage, moduleName, options);
+}
+
+
+/*
+ * NSFindSectionAndOffsetInObjectFileImage() takes the specified imageOffset
+ * into the specified ObjectFileImage and returns the segment/section name and
+ * offset into that section of that imageOffset.  Returns FALSE if the
+ * imageOffset is not in any section.  You can used the resulting sectionOffset
+ * to index into the data returned by NSGetSectionDataInObjectFileImage.
+ * 
+ * SPI: currently only used by ZeroLink to detect +load methods
+ */
+bool 
+NSFindSectionAndOffsetInObjectFileImage(
+NSObjectFileImage objectFileImage, 
+unsigned long imageOffset,
+const char** segmentName, 	/* can be NULL */
+const char** sectionName, 	/* can be NULL */
+unsigned long* sectionOffset)	/* can be NULL */
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static bool (*p)(NSObjectFileImage, unsigned long, const char**, const char**, unsigned long*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSFindSectionAndOffsetInObjectFileImage", (void**)&p);
+		
+	return p(objectFileImage, imageOffset, segmentName, sectionName, sectionOffset);
+}
+
+
+/*
+ * NSSymbolDefinitionCountInObjectFileImage() returns the number of symbol
+ * definitions in the NSObjectFileImage.
+ */
+uint32_t
+NSSymbolDefinitionCountInObjectFileImage(
+NSObjectFileImage objectFileImage)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static unsigned long (*p)(NSObjectFileImage) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSSymbolDefinitionCountInObjectFileImage", (void**)&p);
+		
+	return p(objectFileImage);
+}
+
+/*
+ * NSSymbolDefinitionNameInObjectFileImage() returns the name of the i'th
+ * symbol definitions in the NSObjectFileImage.  If the ordinal specified is
+ * outside the range [0..NSSymbolDefinitionCountInObjectFileImage], NULL will
+ * be returned.
+ */
+const char* 
+NSSymbolDefinitionNameInObjectFileImage(
+NSObjectFileImage objectFileImage,
+uint32_t ordinal)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static const char*  (*p)(NSObjectFileImage, uint32_t) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSSymbolDefinitionNameInObjectFileImage", (void**)&p);
+		
+	return p(objectFileImage, ordinal);
+}
+
+/*
+ * NSSymbolReferenceCountInObjectFileImage() returns the number of references
+ * to undefined symbols the NSObjectFileImage.
+ */
+uint32_t
+NSSymbolReferenceCountInObjectFileImage(
+NSObjectFileImage objectFileImage)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static unsigned long (*p)(NSObjectFileImage) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSSymbolReferenceCountInObjectFileImage", (void**)&p);
+		
+	return p(objectFileImage);
+}
+
+/*
+ * NSSymbolReferenceNameInObjectFileImage() returns the name of the i'th
+ * undefined symbol in the NSObjectFileImage. If the ordinal specified is
+ * outside the range [0..NSSymbolReferenceCountInObjectFileImage], NULL will be
+ * returned.
+ */
+const char* 
+NSSymbolReferenceNameInObjectFileImage(
+NSObjectFileImage objectFileImage,
+uint32_t ordinal,
+bool *tentative_definition) /* can be NULL */
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static const char*  (*p)(NSObjectFileImage, uint32_t, bool*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSSymbolReferenceNameInObjectFileImage", (void**)&p);
+		
+	return p(objectFileImage, ordinal, tentative_definition);
+}
+
+/*
+ * NSIsSymbolDefinedInObjectFileImage() returns TRUE if the specified symbol
+ * name has a definition in the NSObjectFileImage and FALSE otherwise.
+ */
+bool
+NSIsSymbolDefinedInObjectFileImage(
+NSObjectFileImage objectFileImage,
+const char* symbolName)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static bool (*p)(NSObjectFileImage, const char*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSIsSymbolDefinedInObjectFileImage", (void**)&p);
+		
+	return p(objectFileImage, symbolName);
+}
+
+/*
+ * NSGetSectionDataInObjectFileImage() returns a pointer to the section contents
+ * in the NSObjectFileImage for the specified segmentName and sectionName if
+ * it exists and it is not a zerofill section.  If not it returns NULL.  If
+ * the parameter size is not NULL the size of the section is also returned
+ * indirectly through that pointer.
+ */
+void *
+NSGetSectionDataInObjectFileImage(
+NSObjectFileImage objectFileImage,
+const char* segmentName,
+const char* sectionName,
+unsigned long *size) /* can be NULL */
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static void* (*p)(NSObjectFileImage, const char*, const char*, unsigned long*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSGetSectionDataInObjectFileImage", (void**)&p);
+		
+	return p(objectFileImage, segmentName, sectionName, size);
+}
+
+/*
+ * NSHasModInitObjectFileImage() returns TRUE if the NSObjectFileImage has any
+ * module initialization sections and FALSE it it does not.
+ *
+ * SPI: currently only used by ZeroLink to detect C++ initializers
+ */
+bool
+NSHasModInitObjectFileImage(
+NSObjectFileImage objectFileImage)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static bool (*p)(NSObjectFileImage) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_NSHasModInitObjectFileImage", (void**)&p);
+		
+	return p(objectFileImage);
+}
+
+void
+NSLinkEditError(
+NSLinkEditErrors *c,
+int *errorNumber, 
+const char* *fileName,
+const char* *errorString)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static void (*p)(NSLinkEditErrors *c,
+		     int *errorNumber, 
+		     const char* *fileName,
+		     const char* *errorString) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_link_edit_error", (void**)&p);
+	if(p != NULL)
+	    p(c, errorNumber, fileName, errorString);
+}
+
+bool
+NSUnLinkModule(
+NSModule module, 
+uint32_t options)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static bool (*p)(NSModule module, uint32_t options) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_unlink_module", (void**)&p);
+
+	return p(module, options);
+}
+
+NSModule
+NSReplaceModule(
+NSModule moduleToReplace,
+NSObjectFileImage newObjectFileImage, 
+uint32_t options)
+{
+	return(NULL);
+}
+
+/*
+ *_NSGetExecutablePath copies the path of the executable into the buffer and
+ * returns 0 if the path was successfully copied in the provided buffer. If the
+ * buffer is not large enough, -1 is returned and the expected buffer size is
+ * copied in *bufsize. Note that _NSGetExecutablePath will return "a path" to
+ * the executable not a "real path" to the executable. That is the path may be
+ * a symbolic link and not the real file. And with deep directories the total
+ * bufsize needed could be more than MAXPATHLEN.
+ */
+int
+_NSGetExecutablePath(
+char *buf,
+uint32_t *bufsize)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static int (*p)(char *buf, uint32_t *bufsize) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld__NSGetExecutablePath", (void**)&p);
+	return(p(buf, bufsize));
+}
+
+void
+_dyld_lookup_and_bind(
+const char* symbol_name,
+void** address,
+NSModule* module)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static void (*p)(const char*, void** , NSModule*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_lookup_and_bind", (void**)&p);
+	p(symbol_name, address, module);
+}
+
+void
+_dyld_lookup_and_bind_with_hint(
+const char* symbol_name,
+const char* library_name_hint,
+void** address,
+NSModule* module)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static void (*p)(const char*, const char*, void**, NSModule*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_lookup_and_bind_with_hint", (void**)&p);
+	p(symbol_name, library_name_hint, address, module);
+}
+
+void
+_dyld_lookup_and_bind_objc(
+const char* symbol_name,
+void** address,
+NSModule* module)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static void (*p)(const char* , void**, NSModule*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_lookup_and_bind_objc", (void**)&p);
+	p(symbol_name, address, module);
+}
+
+void
+_dyld_lookup_and_bind_fully(
+const char* symbol_name,
+void** address,
+NSModule* module)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static void (*p)(const char*, void**, NSModule*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_lookup_and_bind_fully", (void**)&p);
+	p(symbol_name, address, module);
+}
+
+bool
+_dyld_bind_fully_image_containing_address(
+const void* address)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static bool (*p)(const void*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_bind_fully_image_containing_address", (void**)&p);
+	return p(address);
+}
+
+
+/*
+ * _dyld_register_func_for_add_image registers the specified function to be
+ * called when a new image is added (a bundle or a dynamic shared library) to
+ * the program.  When this function is first registered it is called for once
+ * for each image that is currently part of the program.
+ */
+void
+_dyld_register_func_for_add_image(
+void (*func)(const struct mach_header *mh, intptr_t vmaddr_slide))
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static void (*p)(void (*func)(const struct mach_header *mh, intptr_t vmaddr_slide)) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_register_func_for_add_image", (void**)&p);
+	p(func);
+}
+
+/*
+ * _dyld_register_func_for_remove_image registers the specified function to be
+ * called when an image is removed (a bundle or a dynamic shared library) from
+ * the program.
+ */
+void
+_dyld_register_func_for_remove_image(
+void (*func)(const struct mach_header *mh, intptr_t vmaddr_slide))
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static void (*p)(void (*func)(const struct mach_header *mh, intptr_t vmaddr_slide)) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_register_func_for_remove_image", (void**)&p);
+	p(func);
+}
+
+/*
+ * _dyld_register_func_for_link_module registers the specified function to be
+ * called when a module is bound into the program.  When this function is first
+ * registered it is called for once for each module that is currently bound into
+ * the program.
+ */
+void
+_dyld_register_func_for_link_module(
+void (*func)(NSModule module))
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static void (*p)(void (*func)(NSModule module)) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_register_func_for_link_module", (void**)&p);
+	p(func);
+}
+
+/*
+ * _dyld_register_func_for_unlink_module registers the specified function to be
+ * called when a module is unbound from the program.
+ */
+void
+_dyld_register_func_for_unlink_module(
+void (*func)(NSModule module))
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static void (*p)(void (*func)(NSModule module)) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_register_func_for_unlink_module", (void**)&p);
+	p(func);
+}
+
+/*
+ * _dyld_register_func_for_replace_module registers the specified function to be
+ * called when a module is to be replace with another module in the program.
+ */
+void
+_dyld_register_func_for_replace_module(
+void (*func)(NSModule oldmodule, NSModule newmodule))
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static void (*p)(void (*func)(NSModule oldmodule,
+				  NSModule newmodule)) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_register_func_for_replace_module", (void**)&p);
+	p(func);
+}
+
+
+/*
+ * _dyld_get_objc_module_sect_for_module is passed a module and sets a 
+ * pointer to the (__OBJC,__module) section and its size for the specified
+ * module.
+ */
+void
+_dyld_get_objc_module_sect_for_module(
+NSModule module,
+void **objc_module,
+unsigned long *size)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static void (*p)(NSModule module,
+		     void **objc_module,
+		     unsigned long *size) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_get_objc_module_sect_for_module", (void**)&p);
+	p(module, objc_module, size);
+}
+
+/*
+ * _dyld_bind_objc_module() is passed a pointer to something in an (__OBJC,
+ * __module) section and causes the module that is associated with that address
+ * to be bound.
+ */
+void
+_dyld_bind_objc_module(
+const void* objc_module)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static void (*p)(const void *objc_module) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_bind_objc_module", (void**)&p);
+	p(objc_module);
+}
+
+
+#if __DYNAMIC__
+bool
+_dyld_present(
+void)
+{
+	// hmmm, this code is in libSystem.dylib, which is loaded by dyld...
+	return true;
+}
+#endif
+
+uint32_t
+_dyld_image_count(
+void)
+{
+	DYLD_NO_LOCK_THIS_BLOCK;
+    static unsigned long (*p)(void) = NULL;
+
+	if(_dyld_present() == 0)
+	    return(0);
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_image_count", (void**)&p);
+	return(p());
+}
+
+const struct mach_header *
+_dyld_get_image_header(
+uint32_t image_index)
+{
+	DYLD_NO_LOCK_THIS_BLOCK;
+    static struct mach_header * (*p)(uint32_t image_index) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_get_image_header", (void**)&p);
+	return(p(image_index));
+}
+
+intptr_t
+_dyld_get_image_vmaddr_slide(
+uint32_t image_index)
+{
+	DYLD_NO_LOCK_THIS_BLOCK;
+    static unsigned long (*p)(uint32_t image_index) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_get_image_vmaddr_slide", (void**)&p);
+	return(p(image_index));
+}
+
+const char* 
+_dyld_get_image_name(
+uint32_t image_index)
+{
+	DYLD_NO_LOCK_THIS_BLOCK;
+    static const char*  (*p)(uint32_t image_index) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_get_image_name", (void**)&p);
+	return(p(image_index));
+}
+
+bool
+_dyld_image_containing_address(
+const void* address)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static bool (*p)(const void*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_image_containing_address", (void**)&p);
+	return(p(address));
+}
+
+const struct mach_header *
+_dyld_get_image_header_containing_address(
+const void* address)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static const struct mach_header * (*p)(const void*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_get_image_header_containing_address", (void**)&p);
+	return p(address);
+}
+
+void _dyld_moninit(
+void (*monaddition)(char *lowpc, char *highpc))
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static void (*p)(void (*monaddition)(char *lowpc, char *highpc)) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_moninit", (void**)&p);
+	p(monaddition);
+}
+
+bool _dyld_launched_prebound(
+void)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static bool (*p)(void) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_launched_prebound", (void**)&p);
+	return(p());
+}
+
+bool _dyld_all_twolevel_modules_prebound(
+void)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static bool (*p)(void) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_all_twolevel_modules_prebound", (void**)&p);
+	return(p());
+}
+
+
+#include <dlfcn.h>
+#include <stddef.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <mach-o/dyld.h>
+#include "dyldLock.h"
+#include "dyldLibSystemThreadHelpers.h"
+
+// pthread key used to access per-thread dlerror message
+static pthread_key_t dlerrorPerThreadKey;
+
+// data kept per-thread
+struct dlerrorPerThreadData
+{
+	uint32_t	sizeAllocated;
+	char		message[1];
+};
+
+// function called by dyld to get buffer to store dlerror message
+static char* getPerThreadBufferFor_dlerror(uint32_t sizeRequired)
+{
+	const int size = (sizeRequired < 256) ? 256 : sizeRequired;
+	dlerrorPerThreadData* data = (dlerrorPerThreadData*)pthread_getspecific(dlerrorPerThreadKey);
+	if ( data == NULL ) {
+		//int mallocSize = offsetof(dlerrorPerThreadData, message[size]);
+		const int mallocSize = sizeof(dlerrorPerThreadData)+size;
+		data = (dlerrorPerThreadData*)malloc(mallocSize);
+		data->sizeAllocated = size;
+		pthread_setspecific(dlerrorPerThreadKey, data);
+	}
+	else if ( data->sizeAllocated < sizeRequired ) {
+		free(data);
+		//int mallocSize = offsetof(dlerrorPerThreadData, message[size]);
+		const int mallocSize = sizeof(dlerrorPerThreadData)+size;
+		data = (dlerrorPerThreadData*)malloc(mallocSize);
+		data->sizeAllocated = size;
+		pthread_setspecific(dlerrorPerThreadKey, data);
+	}
+	return data->message;
+}
+
+// that table passed to dyld containing thread helpers
+static dyld::ThreadingHelpers sThreadHelpers = { 1, &lockForLazyBinding, &unlockForLazyBinding, &getPerThreadBufferFor_dlerror };
+
+//
+// during initialization of libSystem this routine will run
+// and call dyld, registering the threading helpers.
+//
+//
+static int registerWithDyld()
+{
+    static void (*p)(dyld::ThreadingHelpers*) = NULL;
+
+	// create key and tell pthread package to call free() on any data associated with key if thread dies
+	pthread_key_create(&dlerrorPerThreadKey, &free);
+	
+	if(p == NULL) 
+	    _dyld_func_lookup("__dyld_register_thread_helpers", (void**)&p);
+	if(p != NULL)
+		p(&sThreadHelpers);
+	
+	return 0;
+}
+
+// should be able to use __attribute__((constructor)) on registerWithDyld, but compiler has bug (3679135)
+// instead use initialization of global to force it to run.
+static int hack = registerWithDyld();
+
+
+char* dlerror()
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static char* (*p)() = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_dlerror", (void**)&p);
+	return(p());
+}
+
+int dladdr(const void* addr, Dl_info* info)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static int (*p)(const void* , Dl_info*) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_dladdr", (void**)&p);
+	return(p(addr, info));
+}
+
+int dlclose(void* handle)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static int (*p)(void* handle) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_dlclose", (void**)&p);
+	return(p(handle));
+}
+
+void* dlopen(const char* path, int mode)
+{
+	DYLD_WRITER_LOCK_THIS_BLOCK;
+    static void* (*p)(const char* path, int) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_dlopen", (void**)&p);
+	return(p(path, mode));
+}
+
+void* dlsym(void* handle, const char* symbol)
+{
+	DYLD_READER_LOCK_THIS_BLOCK;
+    static void* (*p)(void* handle, const char* symbol) = NULL;
+
+	if(p == NULL)
+	    _dyld_func_lookup("__dyld_dlsym", (void**)&p);
+	return(p(handle, symbol));
+}
+
+
+
+
+