mirror of https://github.com/python/cpython
154 lines
4.0 KiB
C
154 lines
4.0 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 "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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#ifdef __VMS
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".exe",
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".EXE",
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#else /* !__VMS */
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"." SOABI ".so",
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".abi" PYTHON_ABI_STRING ".so",
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".so",
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#endif /* __VMS */
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#endif /* __CYGWIN__ */
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NULL,
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};
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static struct {
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dev_t dev;
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#ifdef __VMS
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ino_t ino[3];
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#else
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ino_t ino;
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#endif
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void *handle;
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} handles[128];
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static int nhandles = 0;
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dl_funcptr _PyImport_GetDynLoadFunc(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 "PyInit_%.200s", shortname);
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if (fp != NULL) {
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int i;
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struct stat statb;
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if (fstat(fileno(fp), &statb) == -1) {
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return PyErr_SetFromErrno(PyExc_IOError);
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}
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for (i = 0; i < nhandles; i++) {
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if (statb.st_dev == handles[i].dev &&
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statb.st_ino == handles[i].ino) {
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p = (dl_funcptr) dlsym(handles[i].handle,
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funcname);
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return p;
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}
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}
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if (nhandles < 128) {
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handles[nhandles].dev = statb.st_dev;
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#ifdef __VMS
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handles[nhandles].ino[0] = statb.st_ino[0];
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handles[nhandles].ino[1] = statb.st_ino[1];
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handles[nhandles].ino[2] = statb.st_ino[2];
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#else
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handles[nhandles].ino = statb.st_ino;
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#endif
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}
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}
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dlopenflags = PyThreadState_GET()->interp->dlopenflags;
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#ifdef __VMS
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/* VMS currently don't allow a pathname, use a logical name instead */
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/* Concatenate 'python_module_' and shortname */
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/* so "import vms.bar" will use the logical python_module_bar */
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/* As C module use only one name space this is probably not a */
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/* important limitation */
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PyOS_snprintf(pathbuf, sizeof(pathbuf), "python_module_%-.200s",
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shortname);
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pathname = pathbuf;
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#endif
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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_FromString(error);
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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_FromString(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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if (fp != NULL && nhandles < 128)
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handles[nhandles++].handle = handle;
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p = (dl_funcptr) dlsym(handle, funcname);
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return p;
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}
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