285 lines
7.1 KiB
C
285 lines
7.1 KiB
C
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/* dl module */
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#include "Python.h"
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#include <dlfcn.h>
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#ifdef __VMS
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#include <unistd.h>
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#endif
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#ifndef RTLD_LAZY
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#define RTLD_LAZY 1
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#endif
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typedef void *PyUnivPtr;
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typedef struct {
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PyObject_HEAD
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PyUnivPtr *dl_handle;
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} dlobject;
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static PyTypeObject Dltype;
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static PyObject *Dlerror;
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static PyObject *
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newdlobject(PyUnivPtr *handle)
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{
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dlobject *xp;
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xp = PyObject_New(dlobject, &Dltype);
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if (xp == NULL)
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return NULL;
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xp->dl_handle = handle;
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return (PyObject *)xp;
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}
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static void
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dl_dealloc(dlobject *xp)
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{
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if (xp->dl_handle != NULL)
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dlclose(xp->dl_handle);
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PyObject_Del(xp);
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}
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static PyObject *
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dl_close(dlobject *xp)
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{
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if (xp->dl_handle != NULL) {
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dlclose(xp->dl_handle);
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xp->dl_handle = NULL;
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}
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Py_INCREF(Py_None);
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return Py_None;
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}
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static PyObject *
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dl_sym(dlobject *xp, PyObject *args)
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{
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char *name;
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PyUnivPtr *func;
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if (PyString_Check(args)) {
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name = PyString_AS_STRING(args);
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} else {
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PyErr_Format(PyExc_TypeError, "expected string, found %.200s",
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Py_TYPE(args)->tp_name);
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return NULL;
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}
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func = dlsym(xp->dl_handle, name);
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if (func == NULL) {
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Py_INCREF(Py_None);
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return Py_None;
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}
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return PyInt_FromLong((long)func);
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}
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static PyObject *
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dl_call(dlobject *xp, PyObject *args)
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{
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PyObject *name;
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long (*func)(long, long, long, long, long,
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long, long, long, long, long);
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long alist[10];
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long res;
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Py_ssize_t i;
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Py_ssize_t n = PyTuple_Size(args);
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if (n < 1) {
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PyErr_SetString(PyExc_TypeError, "at least a name is needed");
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return NULL;
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}
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name = PyTuple_GetItem(args, 0);
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if (!PyString_Check(name)) {
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PyErr_SetString(PyExc_TypeError,
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"function name must be a string");
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return NULL;
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}
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func = (long (*)(long, long, long, long, long,
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long, long, long, long, long))
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dlsym(xp->dl_handle, PyString_AsString(name));
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if (func == NULL) {
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PyErr_SetString(PyExc_ValueError, dlerror());
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return NULL;
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}
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if (n-1 > 10) {
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PyErr_SetString(PyExc_TypeError,
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"too many arguments (max 10)");
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return NULL;
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}
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for (i = 1; i < n; i++) {
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PyObject *v = PyTuple_GetItem(args, i);
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if (PyInt_Check(v))
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alist[i-1] = PyInt_AsLong(v);
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else if (PyString_Check(v))
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alist[i-1] = (long)PyString_AsString(v);
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else if (v == Py_None)
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alist[i-1] = (long) ((char *)NULL);
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else {
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PyErr_SetString(PyExc_TypeError,
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"arguments must be int, string or None");
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return NULL;
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}
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}
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for (; i <= 10; i++)
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alist[i-1] = 0;
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res = (*func)(alist[0], alist[1], alist[2], alist[3], alist[4],
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alist[5], alist[6], alist[7], alist[8], alist[9]);
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return PyInt_FromLong(res);
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}
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static PyMethodDef dlobject_methods[] = {
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{"call", (PyCFunction)dl_call, METH_VARARGS},
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{"sym", (PyCFunction)dl_sym, METH_O},
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{"close", (PyCFunction)dl_close, METH_NOARGS},
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{NULL, NULL} /* Sentinel */
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};
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static PyObject *
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dl_getattr(dlobject *xp, char *name)
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{
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return Py_FindMethod(dlobject_methods, (PyObject *)xp, name);
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}
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static PyTypeObject Dltype = {
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PyVarObject_HEAD_INIT(NULL, 0)
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"dl.dl", /*tp_name*/
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sizeof(dlobject), /*tp_basicsize*/
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0, /*tp_itemsize*/
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/* methods */
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(destructor)dl_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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(getattrfunc)dl_getattr,/*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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0, /*tp_hash*/
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};
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static PyObject *
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dl_open(PyObject *self, PyObject *args)
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{
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char *name;
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int mode;
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PyUnivPtr *handle;
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if (sizeof(int) != sizeof(long) ||
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sizeof(long) != sizeof(char *)) {
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PyErr_SetString(PyExc_SystemError,
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"module dl requires sizeof(int) == sizeof(long) == sizeof(char*)");
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return NULL;
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}
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if (PyArg_ParseTuple(args, "z:open", &name))
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mode = RTLD_LAZY;
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else {
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PyErr_Clear();
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if (!PyArg_ParseTuple(args, "zi:open", &name, &mode))
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return NULL;
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#ifndef RTLD_NOW
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if (mode != RTLD_LAZY) {
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PyErr_SetString(PyExc_ValueError, "mode must be 1");
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return NULL;
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}
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#endif
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}
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handle = dlopen(name, mode);
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if (handle == NULL) {
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char *errmsg = dlerror();
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if (!errmsg)
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errmsg = "dlopen() error";
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PyErr_SetString(Dlerror, errmsg);
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return NULL;
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}
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#ifdef __VMS
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/* Under OpenVMS dlopen doesn't do any check, just save the name
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* for later use, so we have to check if the file is readable,
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* the name can be a logical or a file from SYS$SHARE.
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*/
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if (access(name, R_OK)) {
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char fname[strlen(name) + 20];
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strcpy(fname, "SYS$SHARE:");
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strcat(fname, name);
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strcat(fname, ".EXE");
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if (access(fname, R_OK)) {
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dlclose(handle);
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PyErr_SetString(Dlerror,
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"File not found or protection violation");
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return NULL;
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}
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}
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#endif
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return newdlobject(handle);
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}
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static PyMethodDef dl_methods[] = {
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{"open", dl_open, METH_VARARGS},
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{NULL, NULL} /* sentinel */
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};
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/* From socketmodule.c
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* Convenience routine to export an integer value.
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*
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* Errors are silently ignored, for better or for worse...
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*/
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static void
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insint(PyObject *d, char *name, int value)
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{
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PyObject *v = PyInt_FromLong((long) value);
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if (!v || PyDict_SetItemString(d, name, v))
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PyErr_Clear();
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Py_XDECREF(v);
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}
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PyMODINIT_FUNC
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initdl(void)
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{
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PyObject *m, *d, *x;
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if (PyErr_WarnPy3k("the dl module has been removed in "
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"Python 3.0; use the ctypes module instead", 2) < 0)
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return;
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/* Initialize object type */
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Py_TYPE(&Dltype) = &PyType_Type;
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/* Create the module and add the functions */
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m = Py_InitModule("dl", dl_methods);
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if (m == NULL)
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return;
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/* Add some symbolic constants to the module */
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d = PyModule_GetDict(m);
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Dlerror = x = PyErr_NewException("dl.error", NULL, NULL);
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PyDict_SetItemString(d, "error", x);
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x = PyInt_FromLong((long)RTLD_LAZY);
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PyDict_SetItemString(d, "RTLD_LAZY", x);
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#define INSINT(X) insint(d,#X,X)
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#ifdef RTLD_NOW
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INSINT(RTLD_NOW);
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#endif
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#ifdef RTLD_NOLOAD
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INSINT(RTLD_NOLOAD);
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#endif
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#ifdef RTLD_GLOBAL
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INSINT(RTLD_GLOBAL);
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#endif
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#ifdef RTLD_LOCAL
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INSINT(RTLD_LOCAL);
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#endif
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#ifdef RTLD_PARENT
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INSINT(RTLD_PARENT);
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#endif
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#ifdef RTLD_GROUP
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INSINT(RTLD_GROUP);
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#endif
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#ifdef RTLD_WORLD
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INSINT(RTLD_WORLD);
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#endif
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#ifdef RTLD_NODELETE
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INSINT(RTLD_NODELETE);
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#endif
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}
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