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b2fc549278
This change is almost entirely moving code around and hiding import state behind internal API. We introduce no changes to behavior, nor to non-internal API. (Since there was already going to be a lot of churn, I took this as an opportunity to re-organize import.c into topically-grouped sections of code.) The motivation is to simplify a number of upcoming changes. Specific changes: * move existing import-related code to import.c, wherever possible * add internal API for interacting with import state (both global and per-interpreter) * use only API outside of import.c (to limit churn there when changing the location, etc.) * consolidate the import-related state of PyInterpreterState into a single struct field (this changes layout slightly) * add macros for import state in import.c (to simplify changing the location) * group code in import.c into sections *remove _PyState_AddModule() https://github.com/python/cpython/issues/101758
112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
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/* Support for dynamic loading of extension modules */
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#include "Python.h"
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#include "pycore_interp.h" // _PyInterpreterState.dlopenflags
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#include "pycore_pystate.h" // _PyInterpreterState_GET()
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#include "importdl.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#if defined(__NetBSD__)
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#include <sys/param.h>
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#if (NetBSD < 199712)
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#include <nlist.h>
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#include <link.h>
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#define dlerror() "error in dynamic linking"
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#endif
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#endif /* NetBSD */
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#ifdef HAVE_DLFCN_H
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#include <dlfcn.h>
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#endif
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#if (defined(__OpenBSD__) || defined(__NetBSD__)) && !defined(__ELF__)
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#define LEAD_UNDERSCORE "_"
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#else
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#define LEAD_UNDERSCORE ""
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#endif
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/* The .so extension module ABI tag, supplied by the Makefile via
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Makefile.pre.in and configure. This is used to discriminate between
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incompatible .so files so that extensions for different Python builds can
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live in the same directory. E.g. foomodule.cpython-32.so
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*/
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const char *_PyImport_DynLoadFiletab[] = {
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#ifdef __CYGWIN__
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".dll",
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#else /* !__CYGWIN__ */
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"." SOABI ".so",
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#ifdef ALT_SOABI
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"." ALT_SOABI ".so",
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#endif
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".abi" PYTHON_ABI_STRING ".so",
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".so",
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#endif /* __CYGWIN__ */
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NULL,
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};
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dl_funcptr
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_PyImport_FindSharedFuncptr(const char *prefix,
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const char *shortname,
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const char *pathname, FILE *fp)
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{
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dl_funcptr p;
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void *handle;
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char funcname[258];
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char pathbuf[260];
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int dlopenflags=0;
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if (strchr(pathname, '/') == NULL) {
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/* Prefix bare filename with "./" */
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PyOS_snprintf(pathbuf, sizeof(pathbuf), "./%-.255s", pathname);
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pathname = pathbuf;
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}
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PyOS_snprintf(funcname, sizeof(funcname),
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LEAD_UNDERSCORE "%.20s_%.200s", prefix, shortname);
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if (fp != NULL) {
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struct _Py_stat_struct status;
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if (_Py_fstat(fileno(fp), &status) == -1)
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return NULL;
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}
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dlopenflags = _PyImport_GetDLOpenFlags(_PyInterpreterState_GET());
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handle = dlopen(pathname, dlopenflags);
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if (handle == NULL) {
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PyObject *mod_name;
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PyObject *path;
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PyObject *error_ob;
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const char *error = dlerror();
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if (error == NULL)
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error = "unknown dlopen() error";
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error_ob = PyUnicode_DecodeLocale(error, "surrogateescape");
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if (error_ob == NULL)
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return NULL;
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mod_name = PyUnicode_FromString(shortname);
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if (mod_name == NULL) {
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Py_DECREF(error_ob);
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return NULL;
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}
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path = PyUnicode_DecodeFSDefault(pathname);
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if (path == NULL) {
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Py_DECREF(error_ob);
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Py_DECREF(mod_name);
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return NULL;
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}
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PyErr_SetImportError(error_ob, mod_name, path);
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Py_DECREF(error_ob);
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Py_DECREF(mod_name);
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Py_DECREF(path);
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return NULL;
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}
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p = (dl_funcptr) dlsym(handle, funcname);
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return p;
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}
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