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bpo-1635741: Port the termios to multi-phase init (PEP 489) #22139

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Sep 8, 2020
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bpo-1635741: Port the termios to multi-phase init (PEP 489) #22139

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a3faea9
port termios to multi-phase
koubaa Aug 11, 2020
a4bbec3
blurb
koubaa Sep 7, 2020
9d593d7
minor changes
koubaa Sep 8, 2020
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2020-09-07-11-35-02.bpo-1635741.rvIexb.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Port the :mod:`termios` extension module to multi-phase initialization
(:pep:`489`).
182 changes: 101 additions & 81 deletions Modules/termios.c
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Original file line number Diff line number Diff line change
Expand Up @@ -51,8 +51,6 @@ get_termios_state(PyObject *module)
return (termiosmodulestate *)state;
}

#define modulestate_global get_termios_state(PyState_FindModule(&termiosmodule))

static int fdconv(PyObject* obj, void* p)
{
int fd;
Expand All @@ -79,31 +77,32 @@ indexing in the cc array must be done using the symbolic constants defined\n\
in this module.");

static PyObject *
termios_tcgetattr(PyObject *self, PyObject *args)
termios_tcgetattr(PyObject *module, PyObject *args)
{
int fd;
struct termios mode;
PyObject *cc;
speed_t ispeed, ospeed;
PyObject *v;
int i;
char ch;

if (!PyArg_ParseTuple(args, "O&:tcgetattr",
fdconv, (void*)&fd))
fdconv, (void*)&fd)) {
return NULL;
}

if (tcgetattr(fd, &mode) == -1)
return PyErr_SetFromErrno(modulestate_global->TermiosError);
termiosmodulestate *state = PyModule_GetState(module);
struct termios mode;
if (tcgetattr(fd, &mode) == -1) {
return PyErr_SetFromErrno(state->TermiosError);
}

ispeed = cfgetispeed(&mode);
ospeed = cfgetospeed(&mode);
speed_t ispeed = cfgetispeed(&mode);
speed_t ospeed = cfgetospeed(&mode);

cc = PyList_New(NCCS);
if (cc == NULL)
PyObject *cc = PyList_New(NCCS);
if (cc == NULL) {
return NULL;
}

PyObject *v;
int i;
for (i = 0; i < NCCS; i++) {
ch = (char)mode.c_cc[i];
char ch = (char)mode.c_cc[i];
v = PyBytes_FromStringAndSize(&ch, 1);
if (v == NULL)
goto err;
Expand Down Expand Up @@ -156,36 +155,38 @@ queued output, or termios.TCSAFLUSH to change after transmitting all\n\
queued output and discarding all queued input. ");

static PyObject *
termios_tcsetattr(PyObject *self, PyObject *args)
termios_tcsetattr(PyObject *module, PyObject *args)
{
int fd, when;
struct termios mode;
speed_t ispeed, ospeed;
PyObject *term, *cc, *v;
int i;

PyObject *term;
if (!PyArg_ParseTuple(args, "O&iO:tcsetattr",
fdconv, &fd, &when, &term))
fdconv, &fd, &when, &term)) {
return NULL;
}

if (!PyList_Check(term) || PyList_Size(term) != 7) {
PyErr_SetString(PyExc_TypeError,
"tcsetattr, arg 3: must be 7 element list");
return NULL;
}

/* Get the old mode, in case there are any hidden fields... */
termiosmodulestate *state = modulestate_global;
if (tcgetattr(fd, &mode) == -1)
termiosmodulestate *state = PyModule_GetState(module);
struct termios mode;
if (tcgetattr(fd, &mode) == -1) {
return PyErr_SetFromErrno(state->TermiosError);
}

mode.c_iflag = (tcflag_t) PyLong_AsLong(PyList_GetItem(term, 0));
mode.c_oflag = (tcflag_t) PyLong_AsLong(PyList_GetItem(term, 1));
mode.c_cflag = (tcflag_t) PyLong_AsLong(PyList_GetItem(term, 2));
mode.c_lflag = (tcflag_t) PyLong_AsLong(PyList_GetItem(term, 3));
ispeed = (speed_t) PyLong_AsLong(PyList_GetItem(term, 4));
ospeed = (speed_t) PyLong_AsLong(PyList_GetItem(term, 5));
cc = PyList_GetItem(term, 6);
if (PyErr_Occurred())
speed_t ispeed = (speed_t) PyLong_AsLong(PyList_GetItem(term, 4));
speed_t ospeed = (speed_t) PyLong_AsLong(PyList_GetItem(term, 5));
PyObject *cc = PyList_GetItem(term, 6);
if (PyErr_Occurred()) {
return NULL;
}

if (!PyList_Check(cc) || PyList_Size(cc) != NCCS) {
PyErr_Format(PyExc_TypeError,
Expand All @@ -194,6 +195,8 @@ termios_tcsetattr(PyObject *self, PyObject *args)
return NULL;
}

int i;
PyObject *v;
for (i = 0; i < NCCS; i++) {
v = PyList_GetItem(cc, i);

Expand Down Expand Up @@ -226,15 +229,18 @@ A zero duration sends a break for 0.25-0.5 seconds; a nonzero duration\n\
has a system dependent meaning.");

static PyObject *
termios_tcsendbreak(PyObject *self, PyObject *args)
termios_tcsendbreak(PyObject *module, PyObject *args)
{
int fd, duration;

if (!PyArg_ParseTuple(args, "O&i:tcsendbreak",
fdconv, &fd, &duration))
fdconv, &fd, &duration)) {
return NULL;
if (tcsendbreak(fd, duration) == -1)
return PyErr_SetFromErrno(modulestate_global->TermiosError);
}

termiosmodulestate *state = PyModule_GetState(module);
if (tcsendbreak(fd, duration) == -1) {
return PyErr_SetFromErrno(state->TermiosError);
}

Py_RETURN_NONE;
}
Expand All @@ -245,15 +251,18 @@ PyDoc_STRVAR(termios_tcdrain__doc__,
Wait until all output written to file descriptor fd has been transmitted.");

static PyObject *
termios_tcdrain(PyObject *self, PyObject *args)
termios_tcdrain(PyObject *module, PyObject *args)
{
int fd;

if (!PyArg_ParseTuple(args, "O&:tcdrain",
fdconv, &fd))
fdconv, &fd)) {
return NULL;
if (tcdrain(fd) == -1)
return PyErr_SetFromErrno(modulestate_global->TermiosError);
}

termiosmodulestate *state = PyModule_GetState(module);
if (tcdrain(fd) == -1) {
return PyErr_SetFromErrno(state->TermiosError);
}

Py_RETURN_NONE;
}
Expand All @@ -267,15 +276,18 @@ queue, termios.TCOFLUSH for the output queue, or termios.TCIOFLUSH for\n\
both queues. ");

static PyObject *
termios_tcflush(PyObject *self, PyObject *args)
termios_tcflush(PyObject *module, PyObject *args)
{
int fd, queue;

if (!PyArg_ParseTuple(args, "O&i:tcflush",
fdconv, &fd, &queue))
fdconv, &fd, &queue)) {
return NULL;
if (tcflush(fd, queue) == -1)
return PyErr_SetFromErrno(modulestate_global->TermiosError);
}

termiosmodulestate *state = PyModule_GetState(module);
if (tcflush(fd, queue) == -1) {
return PyErr_SetFromErrno(state->TermiosError);
}

Py_RETURN_NONE;
}
Expand All @@ -289,15 +301,18 @@ termios.TCOON to restart output, termios.TCIOFF to suspend input,\n\
or termios.TCION to restart input.");

static PyObject *
termios_tcflow(PyObject *self, PyObject *args)
termios_tcflow(PyObject *module, PyObject *args)
{
int fd, action;

if (!PyArg_ParseTuple(args, "O&i:tcflow",
fdconv, &fd, &action))
fdconv, &fd, &action)) {
return NULL;
if (tcflow(fd, action) == -1)
return PyErr_SetFromErrno(modulestate_global->TermiosError);
}

termiosmodulestate *state = PyModule_GetState(module);
if (tcflow(fd, action) == -1) {
return PyErr_SetFromErrno(state->TermiosError);
}

Py_RETURN_NONE;
}
Expand Down Expand Up @@ -997,44 +1012,49 @@ static void termiosmodule_free(void *m) {
termiosmodule_clear((PyObject *)m);
}

static struct PyModuleDef termiosmodule = {
PyModuleDef_HEAD_INIT,
"termios",
termios__doc__,
sizeof(termiosmodulestate),
termios_methods,
NULL,
termiosmodule_traverse,
termiosmodule_clear,
termiosmodule_free,
};

PyMODINIT_FUNC
PyInit_termios(void)
static int
termios_exec(PyObject *mod)
{
PyObject *m;
struct constant *constant = termios_constants;

if ((m = PyState_FindModule(&termiosmodule)) != NULL) {
Py_INCREF(m);
return m;
}

if ((m = PyModule_Create(&termiosmodule)) == NULL) {
return NULL;
}

termiosmodulestate *state = get_termios_state(m);
termiosmodulestate *state = get_termios_state(mod);
state->TermiosError = PyErr_NewException("termios.error", NULL, NULL);
if (state->TermiosError == NULL) {
return NULL;
return -1;
}
Py_INCREF(state->TermiosError);
PyModule_AddObject(m, "error", state->TermiosError);
if (PyModule_AddObject(mod, "error", state->TermiosError) < 0) {
Py_DECREF(state->TermiosError);
return -1;
}

while (constant->name != NULL) {
PyModule_AddIntConstant(m, constant->name, constant->value);
if (PyModule_AddIntConstant(
mod, constant->name, constant->value) < 0) {
return -1;
}
++constant;
}
return m;
return 0;
}

static PyModuleDef_Slot termios_slots[] = {
{Py_mod_exec, termios_exec},
{0, NULL}
};

static struct PyModuleDef termiosmodule = {
PyModuleDef_HEAD_INIT,
.m_name = "termios",
.m_doc = termios__doc__,
.m_size = sizeof(termiosmodulestate),
.m_methods = termios_methods,
.m_slots = termios_slots,
.m_traverse = termiosmodule_traverse,
.m_clear = termiosmodule_clear,
.m_free = termiosmodule_free,
};

PyMODINIT_FUNC PyInit_termios(void)
{
return PyModuleDef_Init(&termiosmodule);
}