/* Support for dynamic loading of extension modules on Mac OS X** All references to "NeXT" are for historical reasons.*/ #include "Python.h"#include "importdl.h" #include <mach-o/dyld.h> const struct filedescr _PyImport_DynLoadFiletab[] = {	{".so", "rb", C_EXTENSION},	{"module.so", "rb", C_EXTENSION},	{0, 0}}; /*** Python modules are Mach-O MH_BUNDLE files. The best way to load these** is each in a private namespace, so you can load, say, a module bar and a** module foo.bar. If we load everything in the global namespace the two** initbar() symbols will conflict.** However, it seems some extension packages depend upon being able to access** each others' global symbols. There seems to be no way to eat our cake and** have it, so the USE_DYLD_GLOBAL_NAMESPACE define determines which behaviour** you get.*/ #ifdef USE_DYLD_GLOBAL_NAMESPACE#define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW|NSLINKMODULE_OPTION_RETURN_ON_ERROR#else#define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW| \	NSLINKMODULE_OPTION_RETURN_ON_ERROR|NSLINKMODULE_OPTION_PRIVATE#endifdl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,					const char *pathname, FILE *fp){	dl_funcptr p = NULL;	char funcname[258];	NSObjectFileImageReturnCode rc;	NSObjectFileImage image;	NSModule newModule;	NSSymbol theSym;	const char *errString;	char errBuf[512]; 	PyOS_snprintf(funcname, sizeof(funcname), "_init%.200s", shortname); #ifdef USE_DYLD_GLOBAL_NAMESPACE	if (NSIsSymbolNameDefined(funcname)) {		theSym = NSLookupAndBindSymbol(funcname);		p = (dl_funcptr)NSAddressOfSymbol(theSym);		return p;	}#endif	rc = NSCreateObjectFileImageFromFile(pathname, &image);	switch(rc) {		default:		case NSObjectFileImageFailure:		case NSObjectFileImageFormat:			/* for these a message is printed on stderr by dyld */			errString = "Can't create object file image";		break;		case NSObjectFileImageSuccess:			errString = NULL;			break;		case NSObjectFileImageInappropriateFile:			errString = "Inappropriate file type for dynamic loading";			break;		case NSObjectFileImageArch:			errString = "Wrong CPU type in object file";			break;		case NSObjectFileImageAccess:			errString = "Can't read object file (no access)";			break;	}	if (errString == NULL) {		newModule = NSLinkModule(image, pathname, LINKOPTIONS);		if (newModule == NULL) {			int errNo;			const char *fileName, *moreErrorStr;			NSLinkEditErrors c;			NSLinkEditError( &c, &errNo, &fileName, &moreErrorStr );			PyOS_snprintf(errBuf, 512, "Failure linking new module: %s: %s", 					fileName, moreErrorStr);			errString = errBuf;		}	}	if (errString != NULL) {		PyErr_SetString(PyExc_ImportError, errString);		return NULL;	}#ifdef USE_DYLD_GLOBAL_NAMESPACE	if (!NSIsSymbolNameDefined(funcname)) {		/* UnlinkModule() isn't implemented in current versions, but calling it does no harm */		/* NSUnLinkModule(newModule, FALSE); removed: causes problems for ObjC code */		PyErr_Format(PyExc_ImportError,				 "Loaded module does not contain symbol %.200s",				 funcname);		return NULL;	}	theSym = NSLookupAndBindSymbol(funcname);#else	theSym = NSLookupSymbolInModule(newModule, funcname);	if ( theSym == NULL ) {		/* NSUnLinkModule(newModule, FALSE); removed: causes problems for ObjC code */		PyErr_Format(PyExc_ImportError,				 "Loaded module does not contain symbol %.200s",				 funcname);		return NULL;	}#endif	p = (dl_funcptr)NSAddressOfSymbol(theSym);	return p;}