Skip to main content

Browse the archive

Staging
v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision 8ae56530fd7dccaf1992024f8e5185737239e42e authored by Jack Jansen on 25 March 2002, 12:24:50 UTC, committed by Jack Jansen on 25 March 2002, 12:24:50 UTC 
Backport of _Cmmodule.c 1.8 and cmsupport.py 1.6:
 
Weaklink most toolbox modules, improving backward compatibility. Modules will no longer fail to load if a single routine is missing on the curent OS version, in stead calling the missing routine will raise an exception.

Should finally fix 531398. 2.2.1 candidate.

Also blacklisted some constants with definitions that were not Python-compatible.
1 parent 4b9fa73
Raw File
Tip revision: 8ae56530fd7dccaf1992024f8e5185737239e42e authored by Jack Jansen on 25 March 2002, 12:24:50 UTC
Backport of _Cmmodule.c 1.8 and cmsupport.py 1.6:
Tip revision: 8ae5653
dynload_shlib.c 

/* Support for dynamic loading of extension modules */

#include "Python.h"
#include "importdl.h"

#include <sys/types.h>
#include <sys/stat.h>

#if defined(__NetBSD__)
#include <sys/param.h>
#if (NetBSD < 199712)
#include <nlist.h>
#include <link.h>
#define dlerror() "error in dynamic linking"
#endif
#endif /* NetBSD */

#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif

#if (defined(__OpenBSD__) || defined(__NetBSD__)) && !defined(__ELF__)
#define LEAD_UNDERSCORE "_"
#else
#define LEAD_UNDERSCORE ""
#endif


const struct filedescr _PyImport_DynLoadFiletab[] = {
#ifdef __CYGWIN__
	{".dll", "rb", C_EXTENSION},
	{"module.dll", "rb", C_EXTENSION},
#else
	{".so", "rb", C_EXTENSION},
	{"module.so", "rb", C_EXTENSION},
#endif
	{0, 0}
};

static struct {
	dev_t dev;
	ino_t ino;
	void *handle;
} handles[128];
static int nhandles = 0;


dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
				    const char *pathname, FILE *fp)
{
	dl_funcptr p;
	void *handle;
	char funcname[258];
	char pathbuf[260];
        int dlopenflags=0;

	if (strchr(pathname, '/') == NULL) {
		/* Prefix bare filename with "./" */
		PyOS_snprintf(pathbuf, sizeof(pathbuf), "./%-.255s", pathname);
		pathname = pathbuf;
	}

	PyOS_snprintf(funcname, sizeof(funcname), 
		      LEAD_UNDERSCORE "init%.200s", shortname);

	if (fp != NULL) {
		int i;
		struct stat statb;
		fstat(fileno(fp), &statb);
		for (i = 0; i < nhandles; i++) {
			if (statb.st_dev == handles[i].dev &&
			    statb.st_ino == handles[i].ino) {
				p = (dl_funcptr) dlsym(handles[i].handle,
						       funcname);
				return p;
			}
		}
		if (nhandles < 128) {
			handles[nhandles].dev = statb.st_dev;
			handles[nhandles].ino = statb.st_ino;
		}
	}

        dlopenflags = PyThreadState_Get()->interp->dlopenflags;

	if (Py_VerboseFlag)
		printf("dlopen(\"%s\", %x);\n", pathname, dlopenflags);

	handle = dlopen(pathname, dlopenflags);

	if (handle == NULL) {
		PyErr_SetString(PyExc_ImportError, dlerror());
		return NULL;
	}
	if (fp != NULL && nhandles < 128)
		handles[nhandles++].handle = handle;
	p = (dl_funcptr) dlsym(handle, funcname);
	return p;
}
back to top