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Copy pathselectmodule.c
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2824 lines (2395 loc) · 74.2 KB
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/* select - Module containing unix select(2) call.
Under Unix, the file descriptors are small integers.
Under Win32, select only exists for sockets, and sockets may
have any value except INVALID_SOCKET.
*/
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#if defined(HAVE_POLL_H) && !defined(_GNU_SOURCE)
# define _GNU_SOURCE
#endif
#include "Python.h"
#include "pycore_fileutils.h" // _Py_set_inheritable()
#include "pycore_import.h" // _PyImport_GetModuleAttrString()
#include "pycore_time.h" // _PyTime_FromSecondsObject()
#include <stdbool.h>
#include <stddef.h> // offsetof()
#ifndef MS_WINDOWS
# include <unistd.h> // close()
#endif
#ifdef HAVE_SYS_DEVPOLL_H
#include <sys/resource.h>
#include <sys/devpoll.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#endif
#ifdef __APPLE__
/* Perform runtime testing for a broken poll on OSX to make it easier
* to use the same binary on multiple releases of the OS.
*/
#undef HAVE_BROKEN_POLL
#endif
/* Windows #defines FD_SETSIZE to 64 if FD_SETSIZE isn't already defined.
64 is too small (too many people have bumped into that limit).
Here we boost it.
Users who want even more than the boosted limit should #define
FD_SETSIZE higher before this; e.g., via compiler /D switch.
*/
#if defined(MS_WINDOWS) && !defined(FD_SETSIZE)
#define FD_SETSIZE 512
#endif
#if defined(HAVE_POLL_H)
#include <poll.h>
#elif defined(HAVE_SYS_POLL_H)
#include <sys/poll.h>
#endif
#ifdef __sgi
/* This is missing from unistd.h */
extern void bzero(void *, int);
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef MS_WINDOWS
# ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
# endif
# include <winsock2.h>
#else
# define SOCKET int
#endif
// WASI SDK 16 does not have POLLPRIO, define as no-op
#if defined(__wasi__) && !defined(POLLPRI)
# define POLLPRI 0
#endif
#ifdef HAVE_KQUEUE
// Linked list to track kqueue objects with an open fd, so
// that we can invalidate them at fork;
typedef struct _kqueue_list_item {
struct kqueue_queue_Object *obj;
struct _kqueue_list_item *next;
} _kqueue_list_item, *_kqueue_list;
#endif
typedef struct {
PyObject *close;
PyTypeObject *poll_Type;
PyTypeObject *devpoll_Type;
PyTypeObject *pyEpoll_Type;
#ifdef HAVE_KQUEUE
PyTypeObject *kqueue_event_Type;
PyTypeObject *kqueue_queue_Type;
_kqueue_list kqueue_open_list;
bool kqueue_tracking_initialized;
#endif
} _selectstate;
static struct PyModuleDef selectmodule;
static inline _selectstate*
get_select_state(PyObject *module)
{
void *state = PyModule_GetState(module);
assert(state != NULL);
return (_selectstate *)state;
}
#define _selectstate_by_type(type) get_select_state(PyType_GetModule(type))
/*[clinic input]
module select
class select.poll "pollObject *" "_selectstate_by_type(type)->poll_Type"
class select.devpoll "devpollObject *" "_selectstate_by_type(type)->devpoll_Type"
class select.epoll "pyEpoll_Object *" "_selectstate_by_type(type)->pyEpoll_Type"
class select.kqueue "kqueue_queue_Object *" "_selectstate_by_type(type)->kqueue_queue_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=8072de35824aa327]*/
/* list of Python objects and their file descriptor */
typedef struct {
PyObject *obj; /* owned reference */
SOCKET fd;
int sentinel; /* -1 == sentinel */
} pylist;
static void
reap_obj(pylist fd2obj[FD_SETSIZE + 1])
{
unsigned int i;
for (i = 0; i < (unsigned int)FD_SETSIZE + 1 && fd2obj[i].sentinel >= 0; i++) {
Py_CLEAR(fd2obj[i].obj);
}
fd2obj[0].sentinel = -1;
}
/* returns -1 and sets the Python exception if an error occurred, otherwise
returns a number >= 0
*/
static int
seq2set(PyObject *seq, fd_set *set, pylist fd2obj[FD_SETSIZE + 1])
{
int max = -1;
unsigned int index = 0;
Py_ssize_t i;
PyObject* fast_seq = NULL;
PyObject* o = NULL;
fd2obj[0].obj = (PyObject*)0; /* set list to zero size */
FD_ZERO(set);
fast_seq = PySequence_Fast(seq, "arguments 1-3 must be sequences");
if (!fast_seq)
return -1;
for (i = 0; i < PySequence_Fast_GET_SIZE(fast_seq); i++) {
SOCKET v;
/* any intervening fileno() calls could decr this refcnt */
if (!(o = PySequence_Fast_GET_ITEM(fast_seq, i)))
goto finally;
Py_INCREF(o);
v = PyObject_AsFileDescriptor( o );
if (v == -1) goto finally;
#if defined(_MSC_VER)
max = 0; /* not used for Win32 */
#else /* !_MSC_VER */
if (!_PyIsSelectable_fd(v)) {
PyErr_SetString(PyExc_ValueError,
"filedescriptor out of range in select()");
goto finally;
}
if (v > max)
max = v;
#endif /* _MSC_VER */
FD_SET(v, set);
/* add object and its file descriptor to the list */
if (index >= (unsigned int)FD_SETSIZE) {
PyErr_SetString(PyExc_ValueError,
"too many file descriptors in select()");
goto finally;
}
fd2obj[index].obj = o;
fd2obj[index].fd = v;
fd2obj[index].sentinel = 0;
fd2obj[++index].sentinel = -1;
}
Py_DECREF(fast_seq);
return max+1;
finally:
Py_XDECREF(o);
Py_DECREF(fast_seq);
return -1;
}
/* returns NULL and sets the Python exception if an error occurred */
static PyObject *
set2list(fd_set *set, pylist fd2obj[FD_SETSIZE + 1])
{
int i, j, count=0;
PyObject *list, *o;
SOCKET fd;
for (j = 0; fd2obj[j].sentinel >= 0; j++) {
if (FD_ISSET(fd2obj[j].fd, set))
count++;
}
list = PyList_New(count);
if (!list)
return NULL;
i = 0;
for (j = 0; fd2obj[j].sentinel >= 0; j++) {
fd = fd2obj[j].fd;
if (FD_ISSET(fd, set)) {
o = fd2obj[j].obj;
fd2obj[j].obj = NULL;
/* transfer ownership */
if (PyList_SetItem(list, i, o) < 0)
goto finally;
i++;
}
}
return list;
finally:
Py_DECREF(list);
return NULL;
}
#undef SELECT_USES_HEAP
#if FD_SETSIZE > 1024
#define SELECT_USES_HEAP
#endif /* FD_SETSIZE > 1024 */
/*[clinic input]
select.select
rlist: object
wlist: object
xlist: object
timeout as timeout_obj: object = None
/
Wait until one or more file descriptors are ready for some kind of I/O.
The first three arguments are iterables of file descriptors to be waited for:
rlist -- wait until ready for reading
wlist -- wait until ready for writing
xlist -- wait for an "exceptional condition"
If only one kind of condition is required, pass [] for the other lists.
A file descriptor is either a socket or file object, or a small integer
gotten from a fileno() method call on one of those.
The optional 4th argument specifies a timeout in seconds; it may be
a floating point number to specify fractions of seconds. If it is absent
or None, the call will never time out.
The return value is a tuple of three lists corresponding to the first three
arguments; each contains the subset of the corresponding file descriptors
that are ready.
*** IMPORTANT NOTICE ***
On Windows, only sockets are supported; on Unix, all file
descriptors can be used.
[clinic start generated code]*/
static PyObject *
select_select_impl(PyObject *module, PyObject *rlist, PyObject *wlist,
PyObject *xlist, PyObject *timeout_obj)
/*[clinic end generated code: output=2b3cfa824f7ae4cf input=e467f5d68033de00]*/
{
#ifdef SELECT_USES_HEAP
pylist *rfd2obj, *wfd2obj, *efd2obj;
#else /* !SELECT_USES_HEAP */
/* XXX: All this should probably be implemented as follows:
* - find the highest descriptor we're interested in
* - add one
* - that's the size
* See: Stevens, APitUE, $12.5.1
*/
pylist rfd2obj[FD_SETSIZE + 1];
pylist wfd2obj[FD_SETSIZE + 1];
pylist efd2obj[FD_SETSIZE + 1];
#endif /* SELECT_USES_HEAP */
PyObject *ret = NULL;
fd_set ifdset, ofdset, efdset;
struct timeval tv, *tvp;
int imax, omax, emax, max;
int n;
PyTime_t timeout, deadline = 0;
if (timeout_obj == Py_None)
tvp = (struct timeval *)NULL;
else {
if (_PyTime_FromSecondsObject(&timeout, timeout_obj,
_PyTime_ROUND_TIMEOUT) < 0) {
if (PyErr_ExceptionMatches(PyExc_TypeError)) {
PyErr_SetString(PyExc_TypeError,
"timeout must be a float or None");
}
return NULL;
}
if (_PyTime_AsTimeval(timeout, &tv, _PyTime_ROUND_TIMEOUT) == -1)
return NULL;
if (tv.tv_sec < 0) {
PyErr_SetString(PyExc_ValueError, "timeout must be non-negative");
return NULL;
}
tvp = &tv;
}
#ifdef SELECT_USES_HEAP
/* Allocate memory for the lists */
rfd2obj = PyMem_NEW(pylist, FD_SETSIZE + 1);
wfd2obj = PyMem_NEW(pylist, FD_SETSIZE + 1);
efd2obj = PyMem_NEW(pylist, FD_SETSIZE + 1);
if (rfd2obj == NULL || wfd2obj == NULL || efd2obj == NULL) {
if (rfd2obj) PyMem_Free(rfd2obj);
if (wfd2obj) PyMem_Free(wfd2obj);
if (efd2obj) PyMem_Free(efd2obj);
return PyErr_NoMemory();
}
#endif /* SELECT_USES_HEAP */
/* Convert iterables to fd_sets, and get maximum fd number
* propagates the Python exception set in seq2set()
*/
rfd2obj[0].sentinel = -1;
wfd2obj[0].sentinel = -1;
efd2obj[0].sentinel = -1;
if ((imax = seq2set(rlist, &ifdset, rfd2obj)) < 0)
goto finally;
if ((omax = seq2set(wlist, &ofdset, wfd2obj)) < 0)
goto finally;
if ((emax = seq2set(xlist, &efdset, efd2obj)) < 0)
goto finally;
max = imax;
if (omax > max) max = omax;
if (emax > max) max = emax;
if (tvp) {
deadline = _PyDeadline_Init(timeout);
}
do {
Py_BEGIN_ALLOW_THREADS
errno = 0;
n = select(
max,
imax ? &ifdset : NULL,
omax ? &ofdset : NULL,
emax ? &efdset : NULL,
tvp);
Py_END_ALLOW_THREADS
if (errno != EINTR)
break;
/* select() was interrupted by a signal */
if (PyErr_CheckSignals())
goto finally;
if (tvp) {
timeout = _PyDeadline_Get(deadline);
if (timeout < 0) {
/* bpo-35310: lists were unmodified -- clear them explicitly */
FD_ZERO(&ifdset);
FD_ZERO(&ofdset);
FD_ZERO(&efdset);
n = 0;
break;
}
_PyTime_AsTimeval_clamp(timeout, &tv, _PyTime_ROUND_CEILING);
/* retry select() with the recomputed timeout */
}
} while (1);
#ifdef MS_WINDOWS
if (n == SOCKET_ERROR) {
PyErr_SetExcFromWindowsErr(PyExc_OSError, WSAGetLastError());
}
#else
if (n < 0) {
PyErr_SetFromErrno(PyExc_OSError);
}
#endif
else {
/* any of these three calls can raise an exception. it's more
convenient to test for this after all three calls... but
is that acceptable?
*/
rlist = set2list(&ifdset, rfd2obj);
wlist = set2list(&ofdset, wfd2obj);
xlist = set2list(&efdset, efd2obj);
if (PyErr_Occurred())
ret = NULL;
else
ret = PyTuple_Pack(3, rlist, wlist, xlist);
Py_XDECREF(rlist);
Py_XDECREF(wlist);
Py_XDECREF(xlist);
}
finally:
reap_obj(rfd2obj);
reap_obj(wfd2obj);
reap_obj(efd2obj);
#ifdef SELECT_USES_HEAP
PyMem_Free(rfd2obj);
PyMem_Free(wfd2obj);
PyMem_Free(efd2obj);
#endif /* SELECT_USES_HEAP */
return ret;
}
#if defined(HAVE_POLL) && !defined(HAVE_BROKEN_POLL)
/*
* poll() support
*/
typedef struct {
PyObject_HEAD
PyObject *dict;
int ufd_uptodate;
int ufd_len;
struct pollfd *ufds;
int poll_running;
} pollObject;
/* Update the malloc'ed array of pollfds to match the dictionary
contained within a pollObject. Return 1 on success, 0 on an error.
*/
static int
update_ufd_array(pollObject *self)
{
Py_ssize_t i, pos;
PyObject *key, *value;
struct pollfd *old_ufds = self->ufds;
self->ufd_len = PyDict_GET_SIZE(self->dict);
PyMem_RESIZE(self->ufds, struct pollfd, self->ufd_len);
if (self->ufds == NULL) {
self->ufds = old_ufds;
PyErr_NoMemory();
return 0;
}
i = pos = 0;
while (PyDict_Next(self->dict, &pos, &key, &value)) {
assert(i < self->ufd_len);
/* Never overflow */
self->ufds[i].fd = (int)PyLong_AsLong(key);
self->ufds[i].events = (short)(unsigned short)PyLong_AsLong(value);
i++;
}
assert(i == self->ufd_len);
self->ufd_uptodate = 1;
return 1;
}
/*[clinic input]
select.poll.register
fd: fildes
either an integer, or an object with a fileno() method returning an int
eventmask: unsigned_short(c_default="POLLIN | POLLPRI | POLLOUT") = select.POLLIN | select.POLLPRI | select.POLLOUT
an optional bitmask describing the type of events to check for
/
Register a file descriptor with the polling object.
[clinic start generated code]*/
static PyObject *
select_poll_register_impl(pollObject *self, int fd, unsigned short eventmask)
/*[clinic end generated code: output=0dc7173c800a4a65 input=34e16cfb28d3c900]*/
{
PyObject *key, *value;
int err;
/* Add entry to the internal dictionary: the key is the
file descriptor, and the value is the event mask. */
key = PyLong_FromLong(fd);
if (key == NULL)
return NULL;
value = PyLong_FromLong(eventmask);
if (value == NULL) {
Py_DECREF(key);
return NULL;
}
err = PyDict_SetItem(self->dict, key, value);
Py_DECREF(key);
Py_DECREF(value);
if (err < 0)
return NULL;
self->ufd_uptodate = 0;
Py_RETURN_NONE;
}
/*[clinic input]
select.poll.modify
fd: fildes
either an integer, or an object with a fileno() method returning
an int
eventmask: unsigned_short
a bitmask describing the type of events to check for
/
Modify an already registered file descriptor.
[clinic start generated code]*/
static PyObject *
select_poll_modify_impl(pollObject *self, int fd, unsigned short eventmask)
/*[clinic end generated code: output=1a7b88bf079eff17 input=a8e383df075c32cf]*/
{
PyObject *key, *value;
int err;
/* Modify registered fd */
key = PyLong_FromLong(fd);
if (key == NULL)
return NULL;
err = PyDict_Contains(self->dict, key);
if (err < 0) {
Py_DECREF(key);
return NULL;
}
if (err == 0) {
errno = ENOENT;
PyErr_SetFromErrno(PyExc_OSError);
Py_DECREF(key);
return NULL;
}
value = PyLong_FromLong(eventmask);
if (value == NULL) {
Py_DECREF(key);
return NULL;
}
err = PyDict_SetItem(self->dict, key, value);
Py_DECREF(key);
Py_DECREF(value);
if (err < 0)
return NULL;
self->ufd_uptodate = 0;
Py_RETURN_NONE;
}
/*[clinic input]
select.poll.unregister
fd: fildes
/
Remove a file descriptor being tracked by the polling object.
[clinic start generated code]*/
static PyObject *
select_poll_unregister_impl(pollObject *self, int fd)
/*[clinic end generated code: output=8c9f42e75e7d291b input=4b4fccc1040e79cb]*/
{
PyObject *key;
/* Check whether the fd is already in the array */
key = PyLong_FromLong(fd);
if (key == NULL)
return NULL;
if (PyDict_DelItem(self->dict, key) == -1) {
Py_DECREF(key);
/* This will simply raise the KeyError set by PyDict_DelItem
if the file descriptor isn't registered. */
return NULL;
}
Py_DECREF(key);
self->ufd_uptodate = 0;
Py_RETURN_NONE;
}
/*[clinic input]
select.poll.poll
timeout as timeout_obj: object = None
The maximum time to wait in milliseconds, or else None (or a negative
value) to wait indefinitely.
/
Polls the set of registered file descriptors.
Returns a list containing any descriptors that have events or errors to
report, as a list of (fd, event) 2-tuples.
[clinic start generated code]*/
static PyObject *
select_poll_poll_impl(pollObject *self, PyObject *timeout_obj)
/*[clinic end generated code: output=876e837d193ed7e4 input=c2f6953ec45e5622]*/
{
PyObject *result_list = NULL;
int poll_result, i, j;
PyObject *value = NULL, *num = NULL;
PyTime_t timeout = -1, ms = -1, deadline = 0;
int async_err = 0;
if (timeout_obj != Py_None) {
if (_PyTime_FromMillisecondsObject(&timeout, timeout_obj,
_PyTime_ROUND_TIMEOUT) < 0) {
if (PyErr_ExceptionMatches(PyExc_TypeError)) {
PyErr_SetString(PyExc_TypeError,
"timeout must be an integer or None");
}
return NULL;
}
ms = _PyTime_AsMilliseconds(timeout, _PyTime_ROUND_TIMEOUT);
if (ms < INT_MIN || ms > INT_MAX) {
PyErr_SetString(PyExc_OverflowError, "timeout is too large");
return NULL;
}
if (timeout >= 0) {
deadline = _PyDeadline_Init(timeout);
}
}
/* On some OSes, typically BSD-based ones, the timeout parameter of the
poll() syscall, when negative, must be exactly INFTIM, where defined,
or -1. See issue 31334. */
if (ms < 0) {
#ifdef INFTIM
ms = INFTIM;
#else
ms = -1;
#endif
}
/* Avoid concurrent poll() invocation, issue 8865 */
if (self->poll_running) {
PyErr_SetString(PyExc_RuntimeError,
"concurrent poll() invocation");
return NULL;
}
/* Ensure the ufd array is up to date */
if (!self->ufd_uptodate)
if (update_ufd_array(self) == 0)
return NULL;
self->poll_running = 1;
/* call poll() */
async_err = 0;
do {
Py_BEGIN_ALLOW_THREADS
errno = 0;
poll_result = poll(self->ufds, self->ufd_len, (int)ms);
Py_END_ALLOW_THREADS
if (errno != EINTR)
break;
/* poll() was interrupted by a signal */
if (PyErr_CheckSignals()) {
async_err = 1;
break;
}
if (timeout >= 0) {
timeout = _PyDeadline_Get(deadline);
if (timeout < 0) {
poll_result = 0;
break;
}
ms = _PyTime_AsMilliseconds(timeout, _PyTime_ROUND_CEILING);
/* retry poll() with the recomputed timeout */
}
} while (1);
self->poll_running = 0;
if (poll_result < 0) {
if (!async_err)
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
/* build the result list */
result_list = PyList_New(poll_result);
if (!result_list)
return NULL;
for (i = 0, j = 0; j < poll_result; j++) {
/* skip to the next fired descriptor */
while (!self->ufds[i].revents) {
i++;
}
/* if we hit a NULL return, set value to NULL
and break out of loop; code at end will
clean up result_list */
value = PyTuple_New(2);
if (value == NULL)
goto error;
num = PyLong_FromLong(self->ufds[i].fd);
if (num == NULL) {
Py_DECREF(value);
goto error;
}
PyTuple_SET_ITEM(value, 0, num);
/* The &0xffff is a workaround for AIX. 'revents'
is a 16-bit short, and IBM assigned POLLNVAL
to be 0x8000, so the conversion to int results
in a negative number. See SF bug #923315. */
num = PyLong_FromLong(self->ufds[i].revents & 0xffff);
if (num == NULL) {
Py_DECREF(value);
goto error;
}
PyTuple_SET_ITEM(value, 1, num);
PyList_SET_ITEM(result_list, j, value);
i++;
}
return result_list;
error:
Py_DECREF(result_list);
return NULL;
}
static pollObject *
newPollObject(PyObject *module)
{
pollObject *self;
self = PyObject_New(pollObject, get_select_state(module)->poll_Type);
if (self == NULL)
return NULL;
/* ufd_uptodate is a Boolean, denoting whether the
array pointed to by ufds matches the contents of the dictionary. */
self->ufd_uptodate = 0;
self->ufds = NULL;
self->poll_running = 0;
self->dict = PyDict_New();
if (self->dict == NULL) {
Py_DECREF(self);
return NULL;
}
return self;
}
static void
poll_dealloc(pollObject *self)
{
PyObject* type = (PyObject *)Py_TYPE(self);
if (self->ufds != NULL)
PyMem_Free(self->ufds);
Py_XDECREF(self->dict);
PyObject_Free(self);
Py_DECREF(type);
}
#ifdef HAVE_SYS_DEVPOLL_H
static PyMethodDef devpoll_methods[];
typedef struct {
PyObject_HEAD
int fd_devpoll;
int max_n_fds;
int n_fds;
struct pollfd *fds;
} devpollObject;
static PyObject *
devpoll_err_closed(void)
{
PyErr_SetString(PyExc_ValueError, "I/O operation on closed devpoll object");
return NULL;
}
static int devpoll_flush(devpollObject *self)
{
int size, n;
if (!self->n_fds) return 0;
size = sizeof(struct pollfd)*self->n_fds;
self->n_fds = 0;
n = _Py_write(self->fd_devpoll, self->fds, size);
if (n == -1)
return -1;
if (n < size) {
/*
** Data writed to /dev/poll is a binary data structure. It is not
** clear what to do if a partial write occurred. For now, raise
** an exception and see if we actually found this problem in
** the wild.
** See http://bugs.python.org/issue6397.
*/
PyErr_Format(PyExc_OSError, "failed to write all pollfds. "
"Please, report at http://bugs.python.org/. "
"Data to report: Size tried: %d, actual size written: %d.",
size, n);
return -1;
}
return 0;
}
static PyObject *
internal_devpoll_register(devpollObject *self, int fd,
unsigned short events, int remove)
{
if (self->fd_devpoll < 0)
return devpoll_err_closed();
if (remove) {
self->fds[self->n_fds].fd = fd;
self->fds[self->n_fds].events = POLLREMOVE;
if (++self->n_fds == self->max_n_fds) {
if (devpoll_flush(self))
return NULL;
}
}
self->fds[self->n_fds].fd = fd;
self->fds[self->n_fds].events = (signed short)events;
if (++self->n_fds == self->max_n_fds) {
if (devpoll_flush(self))
return NULL;
}
Py_RETURN_NONE;
}
/*[clinic input]
select.devpoll.register
fd: fildes
either an integer, or an object with a fileno() method returning
an int
eventmask: unsigned_short(c_default="POLLIN | POLLPRI | POLLOUT") = select.POLLIN | select.POLLPRI | select.POLLOUT
an optional bitmask describing the type of events to check for
/
Register a file descriptor with the polling object.
[clinic start generated code]*/
static PyObject *
select_devpoll_register_impl(devpollObject *self, int fd,
unsigned short eventmask)
/*[clinic end generated code: output=6e07fe8b74abba0c input=22006fabe9567522]*/
{
return internal_devpoll_register(self, fd, eventmask, 0);
}
/*[clinic input]
select.devpoll.modify
fd: fildes
either an integer, or an object with a fileno() method returning
an int
eventmask: unsigned_short(c_default="POLLIN | POLLPRI | POLLOUT") = select.POLLIN | select.POLLPRI | select.POLLOUT
an optional bitmask describing the type of events to check for
/
Modify a possible already registered file descriptor.
[clinic start generated code]*/
static PyObject *
select_devpoll_modify_impl(devpollObject *self, int fd,
unsigned short eventmask)
/*[clinic end generated code: output=bc2e6d23aaff98b4 input=09fa335db7cdc09e]*/
{
return internal_devpoll_register(self, fd, eventmask, 1);
}
/*[clinic input]
select.devpoll.unregister
fd: fildes
/
Remove a file descriptor being tracked by the polling object.
[clinic start generated code]*/
static PyObject *
select_devpoll_unregister_impl(devpollObject *self, int fd)
/*[clinic end generated code: output=95519ffa0c7d43fe input=b4ea42a4442fd467]*/
{
if (self->fd_devpoll < 0)
return devpoll_err_closed();
self->fds[self->n_fds].fd = fd;
self->fds[self->n_fds].events = POLLREMOVE;
if (++self->n_fds == self->max_n_fds) {
if (devpoll_flush(self))
return NULL;
}
Py_RETURN_NONE;
}
/*[clinic input]
select.devpoll.poll
timeout as timeout_obj: object = None
The maximum time to wait in milliseconds, or else None (or a negative
value) to wait indefinitely.
/
Polls the set of registered file descriptors.
Returns a list containing any descriptors that have events or errors to
report, as a list of (fd, event) 2-tuples.
[clinic start generated code]*/
static PyObject *
select_devpoll_poll_impl(devpollObject *self, PyObject *timeout_obj)
/*[clinic end generated code: output=2654e5457cca0b3c input=3c3f0a355ec2bedb]*/
{
struct dvpoll dvp;
PyObject *result_list = NULL;
int poll_result, i;
PyObject *value, *num1, *num2;
PyTime_t timeout, ms, deadline = 0;
if (self->fd_devpoll < 0)
return devpoll_err_closed();
/* Check values for timeout */
if (timeout_obj == Py_None) {
timeout = -1;
ms = -1;
}
else {
if (_PyTime_FromMillisecondsObject(&timeout, timeout_obj,
_PyTime_ROUND_TIMEOUT) < 0) {
if (PyErr_ExceptionMatches(PyExc_TypeError)) {
PyErr_SetString(PyExc_TypeError,
"timeout must be an integer or None");
}
return NULL;
}
ms = _PyTime_AsMilliseconds(timeout, _PyTime_ROUND_TIMEOUT);
if (ms < -1 || ms > INT_MAX) {
PyErr_SetString(PyExc_OverflowError, "timeout is too large");
return NULL;
}
}
if (devpoll_flush(self))
return NULL;
dvp.dp_fds = self->fds;
dvp.dp_nfds = self->max_n_fds;
dvp.dp_timeout = (int)ms;
if (timeout >= 0) {
deadline = _PyDeadline_Init(timeout);
}
do {
/* call devpoll() */
Py_BEGIN_ALLOW_THREADS
errno = 0;
poll_result = ioctl(self->fd_devpoll, DP_POLL, &dvp);
Py_END_ALLOW_THREADS
if (errno != EINTR)
break;
/* devpoll() was interrupted by a signal */
if (PyErr_CheckSignals())
return NULL;