cpython/Modules/atexitmodule.c at print-statement · python-emscripten/cpython · GitHub

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* atexit - allow programmer to define multiple exit functions to be executed

* upon normal program termination.

* Translated from atexit.py by Collin Winter.

#include "Python.h"

/* Forward declaration (for atexit_cleanup) */

static PyObject *atexit_clear(PyObject*, PyObject*);

/* Forward declaration of module object */

static struct PyModuleDef atexitmodule;

/* ===================================================================== */

/* Callback machinery. */

typedef struct {

PyObject *func;

PyObject *args;

PyObject *kwargs;

} atexit_callback;

typedef struct {

atexit_callback **atexit_callbacks;

int ncallbacks;

int callback_len;

} atexitmodule_state;

static inline atexitmodule_state*

get_atexit_state(PyObject *module)

{

void *state = PyModule_GetState(module);

assert(state != NULL);

return (atexitmodule_state *)state;

}

static void

atexit_delete_cb(atexitmodule_state *modstate, int i)

{

atexit_callback *cb;

cb = modstate->atexit_callbacks[i];

modstate->atexit_callbacks[i] = NULL;

Py_DECREF(cb->func);

Py_DECREF(cb->args);

Py_XDECREF(cb->kwargs);

PyMem_Free(cb);

}

/* Clear all callbacks without calling them */

static void

atexit_cleanup(atexitmodule_state *modstate)

{

atexit_callback *cb;

int i;

for (i = 0; i < modstate->ncallbacks; i++) {

cb = modstate->atexit_callbacks[i];

if (cb == NULL)

continue;

atexit_delete_cb(modstate, i);

}

modstate->ncallbacks = 0;

}

/* Installed into pylifecycle.c's atexit mechanism */

static void

atexit_callfuncs(PyObject *module)

{

PyObject *exc_type = NULL, *exc_value, *exc_tb, *r;

atexit_callback *cb;

atexitmodule_state *modstate;

int i;

if (module == NULL)

return;

modstate = get_atexit_state(module);

if (modstate->ncallbacks == 0)

return;

for (i = modstate->ncallbacks - 1; i >= 0; i--)

{

cb = modstate->atexit_callbacks[i];

if (cb == NULL)

continue;

r = PyObject_Call(cb->func, cb->args, cb->kwargs);

Py_XDECREF(r);

if (r == NULL) {

/* Maintain the last exception, but don't leak if there are

multiple exceptions. */

if (exc_type) {

Py_DECREF(exc_type);

Py_XDECREF(exc_value);

Py_XDECREF(exc_tb);

}

PyErr_Fetch(&exc_type, &exc_value, &exc_tb);

if (!PyErr_GivenExceptionMatches(exc_type, PyExc_SystemExit)) {

PySys_WriteStderr("Error in atexit._run_exitfuncs:\n");

PyErr_NormalizeException(&exc_type, &exc_value, &exc_tb);

PyErr_Display(exc_type, exc_value, exc_tb);

}

atexit_cleanup(modstate);

if (exc_type)

PyErr_Restore(exc_type, exc_value, exc_tb);

}

/* ===================================================================== */

/* Module methods. */

PyDoc_STRVAR(atexit_register__doc__,

"register(func, *args, **kwargs) -> func\n\

\n\

func - function to be called at exit\n\

args - optional arguments to pass to func\n\

kwargs - optional keyword arguments to pass to func\n\

\n\

func is returned to facilitate usage as a decorator.");

static PyObject *

atexit_register(PyObject *self, PyObject *args, PyObject *kwargs)

{

atexitmodule_state *modstate;

atexit_callback *new_callback;

PyObject *func = NULL;

modstate = get_atexit_state(self);

if (modstate->ncallbacks >= modstate->callback_len) {

atexit_callback **r;

modstate->callback_len += 16;

r = (atexit_callback**)PyMem_Realloc(modstate->atexit_callbacks,

sizeof(atexit_callback*) * modstate->callback_len);

if (r == NULL)

return PyErr_NoMemory();

modstate->atexit_callbacks = r;

}

if (PyTuple_GET_SIZE(args) == 0) {

PyErr_SetString(PyExc_TypeError,

"register() takes at least 1 argument (0 given)");

return NULL;

}

func = PyTuple_GET_ITEM(args, 0);

if (!PyCallable_Check(func)) {

PyErr_SetString(PyExc_TypeError,

"the first argument must be callable");

return NULL;

}

new_callback = PyMem_Malloc(sizeof(atexit_callback));

if (new_callback == NULL)

return PyErr_NoMemory();

new_callback->args = PyTuple_GetSlice(args, 1, PyTuple_GET_SIZE(args));

if (new_callback->args == NULL) {

PyMem_Free(new_callback);

return NULL;

}

new_callback->func = func;

new_callback->kwargs = kwargs;

Py_INCREF(func);

Py_XINCREF(kwargs);

modstate->atexit_callbacks[modstate->ncallbacks++] = new_callback;

Py_INCREF(func);

return func;

}

PyDoc_STRVAR(atexit_run_exitfuncs__doc__,

"_run_exitfuncs() -> None\n\

\n\

Run all registered exit functions.");

static PyObject *

atexit_run_exitfuncs(PyObject *self, PyObject *unused)

{

atexit_callfuncs(self);

if (PyErr_Occurred())

return NULL;

Py_RETURN_NONE;

}

PyDoc_STRVAR(atexit_clear__doc__,

"_clear() -> None\n\

\n\

Clear the list of previously registered exit functions.");

static PyObject *

atexit_clear(PyObject *self, PyObject *unused)

{

atexit_cleanup(get_atexit_state(self));

Py_RETURN_NONE;

}

PyDoc_STRVAR(atexit_ncallbacks__doc__,

"_ncallbacks() -> int\n\

\n\

Return the number of registered exit functions.");

static PyObject *

atexit_ncallbacks(PyObject *self, PyObject *unused)

{

atexitmodule_state *modstate;

modstate = get_atexit_state(self);

return PyLong_FromSsize_t(modstate->ncallbacks);

}

static int

atexit_m_traverse(PyObject *self, visitproc visit, void *arg)

{

int i;

atexitmodule_state *modstate;

modstate = (atexitmodule_state *)PyModule_GetState(self);

for (i = 0; i < modstate->ncallbacks; i++) {

atexit_callback *cb = modstate->atexit_callbacks[i];

if (cb == NULL)

continue;

Py_VISIT(cb->func);

Py_VISIT(cb->args);

Py_VISIT(cb->kwargs);

}

return 0;

}

static int

atexit_m_clear(PyObject *self)

{

atexitmodule_state *modstate;

modstate = (atexitmodule_state *)PyModule_GetState(self);

atexit_cleanup(modstate);

return 0;

}

static void

atexit_free(PyObject *m)

{

atexitmodule_state *modstate;

modstate = (atexitmodule_state *)PyModule_GetState(m);

atexit_cleanup(modstate);

PyMem_Free(modstate->atexit_callbacks);

}

PyDoc_STRVAR(atexit_unregister__doc__,

"unregister(func) -> None\n\

\n\

Unregister an exit function which was previously registered using\n\

atexit.register\n\

\n\

func - function to be unregistered");

static PyObject *

atexit_unregister(PyObject *self, PyObject *func)

{

atexitmodule_state *modstate;

atexit_callback *cb;

int i, eq;

modstate = get_atexit_state(self);

for (i = 0; i < modstate->ncallbacks; i++)

{

cb = modstate->atexit_callbacks[i];

if (cb == NULL)

continue;

eq = PyObject_RichCompareBool(cb->func, func, Py_EQ);

if (eq < 0)

return NULL;

if (eq)

atexit_delete_cb(modstate, i);

}

Py_RETURN_NONE;

}

static PyMethodDef atexit_methods[] = {

{"register", (PyCFunction)(void(*)(void)) atexit_register, METH_VARARGS|METH_KEYWORDS,

atexit_register__doc__},

{"_clear", (PyCFunction) atexit_clear, METH_NOARGS,

atexit_clear__doc__},

{"unregister", (PyCFunction) atexit_unregister, METH_O,

atexit_unregister__doc__},

{"_run_exitfuncs", (PyCFunction) atexit_run_exitfuncs, METH_NOARGS,

atexit_run_exitfuncs__doc__},

{"_ncallbacks", (PyCFunction) atexit_ncallbacks, METH_NOARGS,

atexit_ncallbacks__doc__},

{NULL, NULL} /* sentinel */

};

/* ===================================================================== */

/* Initialization function. */

PyDoc_STRVAR(atexit__doc__,

"allow programmer to define multiple exit functions to be executed\

upon normal program termination.\n\

\n\

Two public functions, register and unregister, are defined.\n\

");

static int

atexit_exec(PyObject *m) {

atexitmodule_state *modstate;

modstate = get_atexit_state(m);

modstate->callback_len = 32;

modstate->ncallbacks = 0;

modstate->atexit_callbacks = PyMem_New(atexit_callback*,

modstate->callback_len);

if (modstate->atexit_callbacks == NULL)

return -1;

_Py_PyAtExit(atexit_callfuncs, m);

return 0;

}

static PyModuleDef_Slot atexit_slots[] = {

{Py_mod_exec, atexit_exec},

{0, NULL}

};

static struct PyModuleDef atexitmodule = {

PyModuleDef_HEAD_INIT,

"atexit",

atexit__doc__,

sizeof(atexitmodule_state),

atexit_methods,

atexit_slots,

atexit_m_traverse,

atexit_m_clear,

(freefunc)atexit_free

};

PyMODINIT_FUNC

PyInit_atexit(void)

{

return PyModuleDef_Init(&atexitmodule);

}

cpython/Modules/atexitmodule.c at print-statement · python-emscripten/cpython · GitHub

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