ref: 52cacba37c6f3a125ef931afa4b9c2cdb7438fef
dir: /sys/src/cmd/python/Modules/dlmodule.c/
/* dl module */
#include "Python.h"
#include <dlfcn.h>
#ifdef __VMS
#include <unistd.h>
#endif
#ifndef RTLD_LAZY
#define RTLD_LAZY 1
#endif
typedef void *PyUnivPtr;
typedef struct {
PyObject_HEAD
PyUnivPtr *dl_handle;
} dlobject;
static PyTypeObject Dltype;
static PyObject *Dlerror;
static PyObject *
newdlobject(PyUnivPtr *handle)
{
dlobject *xp;
xp = PyObject_New(dlobject, &Dltype);
if (xp == NULL)
return NULL;
xp->dl_handle = handle;
return (PyObject *)xp;
}
static void
dl_dealloc(dlobject *xp)
{
if (xp->dl_handle != NULL)
dlclose(xp->dl_handle);
PyObject_Del(xp);
}
static PyObject *
dl_close(dlobject *xp)
{
if (xp->dl_handle != NULL) {
dlclose(xp->dl_handle);
xp->dl_handle = NULL;
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
dl_sym(dlobject *xp, PyObject *args)
{
char *name;
PyUnivPtr *func;
if (PyString_Check(args)) {
name = PyString_AS_STRING(args);
} else {
PyErr_Format(PyExc_TypeError, "expected string, found %.200s",
args->ob_type->tp_name);
return NULL;
}
func = dlsym(xp->dl_handle, name);
if (func == NULL) {
Py_INCREF(Py_None);
return Py_None;
}
return PyInt_FromLong((long)func);
}
static PyObject *
dl_call(dlobject *xp, PyObject *args)
{
PyObject *name;
long (*func)(long, long, long, long, long,
long, long, long, long, long);
long alist[10];
long res;
Py_ssize_t i;
Py_ssize_t n = PyTuple_Size(args);
if (n < 1) {
PyErr_SetString(PyExc_TypeError, "at least a name is needed");
return NULL;
}
name = PyTuple_GetItem(args, 0);
if (!PyString_Check(name)) {
PyErr_SetString(PyExc_TypeError,
"function name must be a string");
return NULL;
}
func = (long (*)(long, long, long, long, long,
long, long, long, long, long))
dlsym(xp->dl_handle, PyString_AsString(name));
if (func == NULL) {
PyErr_SetString(PyExc_ValueError, dlerror());
return NULL;
}
if (n-1 > 10) {
PyErr_SetString(PyExc_TypeError,
"too many arguments (max 10)");
return NULL;
}
for (i = 1; i < n; i++) {
PyObject *v = PyTuple_GetItem(args, i);
if (PyInt_Check(v))
alist[i-1] = PyInt_AsLong(v);
else if (PyString_Check(v))
alist[i-1] = (long)PyString_AsString(v);
else if (v == Py_None)
alist[i-1] = (long) ((char *)NULL);
else {
PyErr_SetString(PyExc_TypeError,
"arguments must be int, string or None");
return NULL;
}
}
for (; i <= 10; i++)
alist[i-1] = 0;
res = (*func)(alist[0], alist[1], alist[2], alist[3], alist[4],
alist[5], alist[6], alist[7], alist[8], alist[9]);
return PyInt_FromLong(res);
}
static PyMethodDef dlobject_methods[] = {
{"call", (PyCFunction)dl_call, METH_VARARGS},
{"sym", (PyCFunction)dl_sym, METH_O},
{"close", (PyCFunction)dl_close, METH_NOARGS},
{NULL, NULL} /* Sentinel */
};
static PyObject *
dl_getattr(dlobject *xp, char *name)
{
return Py_FindMethod(dlobject_methods, (PyObject *)xp, name);
}
static PyTypeObject Dltype = {
PyObject_HEAD_INIT(NULL)
0, /*ob_size*/
"dl.dl", /*tp_name*/
sizeof(dlobject), /*tp_basicsize*/
0, /*tp_itemsize*/
/* methods */
(destructor)dl_dealloc, /*tp_dealloc*/
0, /*tp_print*/
(getattrfunc)dl_getattr,/*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash*/
};
static PyObject *
dl_open(PyObject *self, PyObject *args)
{
char *name;
int mode;
PyUnivPtr *handle;
if (sizeof(int) != sizeof(long) ||
sizeof(long) != sizeof(char *)) {
PyErr_SetString(PyExc_SystemError,
"module dl requires sizeof(int) == sizeof(long) == sizeof(char*)");
return NULL;
}
if (PyArg_ParseTuple(args, "z:open", &name))
mode = RTLD_LAZY;
else {
PyErr_Clear();
if (!PyArg_ParseTuple(args, "zi:open", &name, &mode))
return NULL;
#ifndef RTLD_NOW
if (mode != RTLD_LAZY) {
PyErr_SetString(PyExc_ValueError, "mode must be 1");
return NULL;
}
#endif
}
handle = dlopen(name, mode);
if (handle == NULL) {
PyErr_SetString(Dlerror, dlerror());
return NULL;
}
#ifdef __VMS
/* Under OpenVMS dlopen doesn't do any check, just save the name
* for later use, so we have to check if the file is readable,
* the name can be a logical or a file from SYS$SHARE.
*/
if (access(name, R_OK)) {
char fname[strlen(name) + 20];
strcpy(fname, "SYS$SHARE:");
strcat(fname, name);
strcat(fname, ".EXE");
if (access(fname, R_OK)) {
dlclose(handle);
PyErr_SetString(Dlerror,
"File not found or protection violation");
return NULL;
}
}
#endif
return newdlobject(handle);
}
static PyMethodDef dl_methods[] = {
{"open", dl_open, METH_VARARGS},
{NULL, NULL} /* sentinel */
};
/* From socketmodule.c
* Convenience routine to export an integer value.
*
* Errors are silently ignored, for better or for worse...
*/
static void
insint(PyObject *d, char *name, int value)
{
PyObject *v = PyInt_FromLong((long) value);
if (!v || PyDict_SetItemString(d, name, v))
PyErr_Clear();
Py_XDECREF(v);
}
PyMODINIT_FUNC
initdl(void)
{
PyObject *m, *d, *x;
/* Initialize object type */
Dltype.ob_type = &PyType_Type;
/* Create the module and add the functions */
m = Py_InitModule("dl", dl_methods);
if (m == NULL)
return;
/* Add some symbolic constants to the module */
d = PyModule_GetDict(m);
Dlerror = x = PyErr_NewException("dl.error", NULL, NULL);
PyDict_SetItemString(d, "error", x);
x = PyInt_FromLong((long)RTLD_LAZY);
PyDict_SetItemString(d, "RTLD_LAZY", x);
#define INSINT(X) insint(d,#X,X)
#ifdef RTLD_NOW
INSINT(RTLD_NOW);
#endif
#ifdef RTLD_NOLOAD
INSINT(RTLD_NOLOAD);
#endif
#ifdef RTLD_GLOBAL
INSINT(RTLD_GLOBAL);
#endif
#ifdef RTLD_LOCAL
INSINT(RTLD_LOCAL);
#endif
#ifdef RTLD_PARENT
INSINT(RTLD_PARENT);
#endif
#ifdef RTLD_GROUP
INSINT(RTLD_GROUP);
#endif
#ifdef RTLD_WORLD
INSINT(RTLD_WORLD);
#endif
#ifdef RTLD_NODELETE
INSINT(RTLD_NODELETE);
#endif
}