dynload_shlib.c

/* Support for dynamic loading of extension modules */

#include"Python.h"
#include"pycore_interp.h"// _PyInterpreterState.dlopenflags
#include"pycore_pystate.h"// _PyInterpreterState_GET()
#include"pycore_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>
#definedlerror() "error in dynamic linking"
#endif
#endif/* NetBSD */

#ifdefHAVE_DLFCN_H
#include<dlfcn.h>
#endif

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

/* The .so extension module ABI tag, supplied by the Makefile via
 Makefile.pre.in and configure. This is used to discriminate between
 incompatible .so files so that extensions for different Python builds can
 live in the same directory. E.g. foomodule.cpython-32.so
*/

constchar*_PyImport_DynLoadFiletab[] = {
#ifdef__CYGWIN__
".dll",
#else/* !__CYGWIN__ */
"."SOABI".so",
#ifdefALT_SOABI
"."ALT_SOABI".so",
#endif
".abi"PYTHON_ABI_STRING".so",
".so",
#endif/* __CYGWIN__ */
NULL,
};


dl_funcptr
_PyImport_FindSharedFuncptr(constchar*prefix,
constchar*shortname,
constchar*pathname, FILE*fp)
{
dl_funcptrp;
void*handle;
charfuncname[258];
charpathbuf[260];
intdlopenflags=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"%.20s_%.200s", prefix, shortname);

if (fp!=NULL) {
struct_Py_stat_structstatus;
if (_Py_fstat(fileno(fp), &status) ==-1)
returnNULL;
 }

dlopenflags=_PyImport_GetDLOpenFlags(_PyInterpreterState_GET());

handle=dlopen(pathname, dlopenflags);

if (handle==NULL) {
PyObject*mod_name;
PyObject*path;
PyObject*error_ob;
constchar*error=dlerror();
if (error==NULL)
error="unknown dlopen() error";
error_ob=PyUnicode_DecodeLocale(error, "surrogateescape");
if (error_ob==NULL)
returnNULL;
mod_name=PyUnicode_FromString(shortname);
if (mod_name==NULL) {
Py_DECREF(error_ob);
returnNULL;
 }
path=PyUnicode_DecodeFSDefault(pathname);
if (path==NULL) {
Py_DECREF(error_ob);
Py_DECREF(mod_name);
returnNULL;
 }
PyErr_SetImportError(error_ob, mod_name, path);
Py_DECREF(error_ob);
Py_DECREF(mod_name);
Py_DECREF(path);
returnNULL;
 }
p= (dl_funcptr) dlsym(handle, funcname);
returnp;
}