Qt.git - Qt s a cross-platform application framework that is used for developing application software that can be run on various software and hardware platforms with little or no change in the underlying codebase, while still being a native application with native capabilities and speed.

path: root/src/3rdparty/webkit/JavaScriptCore/API/JSValueRef.cpp

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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.
*/

#if defined(HAVE_POLL_H) && !defined(_GNU_SOURCE)
#define _GNU_SOURCE
#endif

#include "Python.h"
#include "structmember.h"         // PyMemberDef

#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
#  define WIN32_LEAN_AND_MEAN
#  include <winsock.h>
#else
#  define SOCKET int
#endif

typedef struct {
    PyObject *close;
    PyTypeObject *poll_Type;
    PyTypeObject *devpoll_Type;
    PyTypeObject *pyEpoll_Type;
    PyTypeObject *kqueue_event_Type;
    PyTypeObject *kqueue_queue_Type;
} _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 = _PyTime_GetMonotonicClock() + timeout;

    do {
        Py_BEGIN_ALLOW_THREADS
        errno = 0;
        n = select(max, &ifdset, &ofdset, &efdset, tvp);
        Py_END_ALLOW_THREADS

        if (errno != EINTR)
            break;

        /* select() was interrupted by a signal */
        if (PyErr_CheckSignals())
            goto finally;

        if (tvp) {
            timeout = deadline - _PyTime_GetMonotonicClock();
            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_noraise(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 = _PyTime_GetMonotonicClock() + 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 = deadline - _PyTime_GetMonotonicClock();
            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 = _PyTime_GetMonotonicClock() + 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;

        if (timeout >= 0) {
            timeout = deadline - _PyTime_GetMonotonicClock();
            if (timeout < 0) {
                poll_result = 0;
                break;
            }
            ms = _PyTime_AsMilliseconds(timeout, _PyTime_ROUND_CEILING);
            dvp.dp_timeout = (int)ms;
            /* retry devpoll() with the recomputed timeout */
        }
    } while (1);

    if (poll_result < 0) {
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }

    /* build the result list */
    result_list = PyList_New(poll_result);
    if (!result_list)
        return NULL;

    for (i = 0; i < poll_result; i++) {
        num1 = PyLong_FromLong(self->fds[i].fd);
        num2 = PyLong_FromLong(self->fds[i].revents);
        if ((num1 == NULL) || (num2 == NULL)) {
            Py_XDECREF(num1);
            Py_XDECREF(num2);
            goto error;
        }
        value = PyTuple_Pack(2, num1, num2);
        Py_DECREF(num1);
        Py_DECREF(num2);
        if (value == NULL)
            goto error;
        PyList_SET_ITEM(result_list, i, value);
    }

    return result_list;

  error:
    Py_DECREF(result_list);
    return NULL;
}

static int
devpoll_internal_close(devpollObject *self)
{
    int save_errno = 0;
    if (self->fd_devpoll >= 0) {
        int fd = self->fd_devpoll;
        self->fd_devpoll = -1;
        Py_BEGIN_ALLOW_THREADS
        if (close(fd) < 0)
            save_errno = errno;
        Py_END_ALLOW_THREADS
    }
    return save_errno;
}

/*[clinic input]
select.devpoll.close

Close the devpoll file descriptor.

Further operations on the devpoll object will raise an exception.
[clinic start generated code]*/

static PyObject *
select_devpoll_close_impl(devpollObject *self)
/*[clinic end generated code: output=26b355bd6429f21b input=6273c30f5560a99b]*/
{
    errno = devpoll_internal_close(self);
    if (errno < 0) {
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }
    Py_RETURN_NONE;
}

static PyObject*
devpoll_get_closed(devpollObject *self, void *Py_UNUSED(ignored))
{
    if (self->fd_devpoll < 0)
        Py_RETURN_TRUE;
    else
        Py_RETURN_FALSE;
}

/*[clinic input]
select.devpoll.fileno

Return the file descriptor.
[clinic start generated code]*/

static PyObject *
select_devpoll_fileno_impl(devpollObject *self)
/*[clinic end generated code: output=26920929f8d292f4 input=ef15331ebde6c368]*/
{
    if (self->fd_devpoll < 0)
        return devpoll_err_closed();
    return PyLong_FromLong(self->fd_devpoll);
}

static PyGetSetDef devpoll_getsetlist[] = {
    {"closed", (getter)devpoll_get_closed, NULL,
     "True if the devpoll object is closed"},
    {0},
};

static devpollObject *
newDevPollObject(PyObject *module)
{
    devpollObject *self;
    int fd_devpoll, limit_result;
    struct pollfd *fds;
    struct rlimit limit;

    /*
    ** If we try to process more that getrlimit()
    ** fds, the kernel will give an error, so
    ** we set the limit here. It is a dynamic
    ** value, because we can change rlimit() anytime.
    */
    limit_result = getrlimit(RLIMIT_NOFILE, &limit);
    if (limit_result == -1) {
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }

    fd_devpoll = _Py_open("/dev/poll", O_RDWR);
    if (fd_devpoll == -1)
        return NULL;

    fds = PyMem_NEW(struct pollfd, limit.rlim_cur);
    if (fds == NULL) {
        close(fd_devpoll);
        PyErr_NoMemory();
        return NULL;
    }

    self = PyObject_New(devpollObject, get_select_state(module)->devpoll_Type);
    if (self == NULL) {
        close(fd_devpoll);
        PyMem_Free(fds);
        return NULL;
    }
    self->fd_devpoll = fd_devpoll;
    self->max_n_fds = limit.rlim_cur;
    self->n_fds = 0;
    self->fds = fds;

    return self;
}

static void
devpoll_dealloc(devpollObject *self)
{
    PyObject *type = (PyObject *)Py_TYPE(self);
    (void)devpoll_internal_close(self);
    PyMem_Free(self->fds);
    PyObject_Free(self);
    Py_DECREF(type);
}

static PyType_Slot devpoll_Type_slots[] = {
    {Py_tp_dealloc, devpoll_dealloc},
    {Py_tp_getset, devpoll_getsetlist},
    {Py_tp_methods, devpoll_methods},
    {0, 0},
};

static PyType_Spec devpoll_Type_spec = {
    "select.devpoll",
    sizeof(devpollObject),
    0,
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION,
    devpoll_Type_slots
};

#endif  /* HAVE_SYS_DEVPOLL_H */


/*[clinic input]
select.poll

Returns a polling object.

This object supports registering and unregistering file descriptors, and then
polling them for I/O events.
[clinic start generated code]*/

static PyObject *
select_poll_impl(PyObject *module)
/*[clinic end generated code: output=16a665a4e1d228c5 input=3f877909d5696bbf]*/
{
    return (PyObject *)newPollObject(module);
}

#ifdef HAVE_SYS_DEVPOLL_H

/*[clinic input]
select.devpoll

Returns a polling object.

This object supports registering and unregistering file descriptors, and then
polling them for I/O events.
[clinic start generated code]*/

static PyObject *
select_devpoll_impl(PyObject *module)
/*[clinic end generated code: output=ea9213cc87fd9581 input=53a1af94564f00a3]*/
{
    return (PyObject *)newDevPollObject(module);
}
#endif


#ifdef __APPLE__
/*
 * On some systems poll() sets errno on invalid file descriptors. We test
 * for this at runtime because this bug may be fixed or introduced between
 * OS releases.
 */
static int select_have_broken_poll(void)
{
    int poll_test;
    int filedes[2];

    struct pollfd poll_struct = { 0, POLLIN|POLLPRI|POLLOUT, 0 };

    /* Create a file descriptor to make invalid */
    if (pipe(filedes) < 0) {
        return 1;
    }
    poll_struct.fd = filedes[0];
    close(filedes[0]);
    close(filedes[1]);
    poll_test = poll(&poll_struct, 1, 0);
    if (poll_test < 0) {
        return 1;
    } else if (poll_test == 0 && poll_struct.revents != POLLNVAL) {
        return 1;
    }
    return 0;
}
#endif /* __APPLE__ */

#endif /* HAVE_POLL */

#ifdef HAVE_EPOLL
/* **************************************************************************
 *                      epoll interface for Linux 2.6
 *
 * Written by Christian Heimes
 * Inspired by Twisted's _epoll.pyx and select.poll()
 */

#ifdef HAVE_SYS_EPOLL_H
#include <sys/epoll.h>
#endif

typedef struct {
    PyObject_HEAD
    SOCKET epfd;                        /* epoll control file descriptor */
} pyEpoll_Object;

static PyObject *
pyepoll_err_closed(void)
{
    PyErr_SetString(PyExc_ValueError, "I/O operation on closed epoll object");
    return NULL;
}

static int
pyepoll_internal_close(pyEpoll_Object *self)
{
    int save_errno = 0;
    if (self->epfd >= 0) {
        int epfd = self->epfd;
        self->epfd = -1;
        Py_BEGIN_ALLOW_THREADS
        if (close(epfd) < 0)
            save_errno = errno;
        Py_END_ALLOW_THREADS
    }
    return save_errno;
}

static PyObject *
newPyEpoll_Object(PyTypeObject *type, int sizehint, SOCKET fd)
{
    pyEpoll_Object *self;
    assert(type != NULL);
    allocfunc epoll_alloc = PyType_GetSlot(type, Py_tp_alloc);
    assert(epoll_alloc != NULL);
    self = (pyEpoll_Object *) epoll_alloc(type, 0);
    if (self == NULL)
        return NULL;

    if (fd == -1) {
        Py_BEGIN_ALLOW_THREADS
#ifdef HAVE_EPOLL_CREATE1
        self->epfd = epoll_create1(EPOLL_CLOEXEC);
#else
        self->epfd = epoll_create(sizehint);
#endif
        Py_END_ALLOW_THREADS
    }
    else {
        self->epfd = fd;
    }
    if (self->epfd < 0) {
        Py_DECREF(self);
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }

#ifndef HAVE_EPOLL_CREATE1
    if (fd == -1 && _Py_set_inheritable(self->epfd, 0, NULL) < 0) {
        Py_DECREF(self);
        return NULL;
    }
#endif

    return (PyObject *)self;
}


/*[clinic input]
@classmethod
select.epoll.__new__

    sizehint: int = -1
      The expected number of events to be registered.  It must be positive,
      or -1 to use the default.  It is only used on older systems where
      epoll_create1() is not available; otherwise it has no effect (though its
      value is still checked).
    flags: int = 0
      Deprecated and completely ignored.  However, when supplied, its value
      must be 0 or select.EPOLL_CLOEXEC, otherwise OSError is raised.

Returns an epolling object.
[clinic start generated code]*/

static PyObject *
select_epoll_impl(PyTypeObject *type, int sizehint, int flags)
/*[clinic end generated code: output=c87404e705013bb5 input=303e3295e7975e43]*/
{
    if (sizehint == -1) {
        sizehint = FD_SETSIZE - 1;
    }
    else if (sizehint <= 0) {
        PyErr_SetString(PyExc_ValueError, "negative sizehint");
        return NULL;
    }

#ifdef HAVE_EPOLL_CREATE1
    if (flags && flags != EPOLL_CLOEXEC) {
        PyErr_SetString(PyExc_OSError, "invalid flags");
        return NULL;
    }
#endif

    return newPyEpoll_Object(type, sizehint, -1);
}


static void
pyepoll_dealloc(pyEpoll_Object *self)
{
    PyTypeObject* type = Py_TYPE(self);
    (void)pyepoll_internal_close(self);
    freefunc epoll_free = PyType_GetSlot(type, Py_tp_free);
    epoll_free((PyObject *)self);
    Py_DECREF((PyObject *)type);
}

/*[clinic input]
select.epoll.close

Close the epoll control file descriptor.

Further operations on the epoll object will raise an exception.
[clinic start generated code]*/

static PyObject *
select_epoll_close_impl(pyEpoll_Object *self)
/*[clinic end generated code: output=ee2144c446a1a435 input=ca6c66ba5a736bfd]*/
{
    errno = pyepoll_internal_close(self);
    if (errno < 0) {
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }
    Py_RETURN_NONE;
}


static PyObject*
pyepoll_get_closed(pyEpoll_Object *self, void *Py_UNUSED(ignored))
{
    if (self->epfd < 0)
        Py_RETURN_TRUE;
    else
        Py_RETURN_FALSE;
}

/*[clinic input]
select.epoll.fileno

Return the epoll control file descriptor.
[clinic start generated code]*/

static PyObject *
select_epoll_fileno_impl(pyEpoll_Object *self)
/*[clinic end generated code: output=e171375fdc619ba3 input=c11091a6aee60b5c]*/
{
    if (self->epfd < 0)
        return pyepoll_err_closed();
    return PyLong_FromLong(self->epfd);
}


/*[clinic input]
@classmethod
select.epoll.fromfd

    fd: int
    /

Create an epoll object from a given control fd.
[clinic start generated code]*/

static PyObject *
select_epoll_fromfd_impl(PyTypeObject *type, int fd)
/*[clinic end generated code: output=c15de2a083524e8e input=faecefdb55e3046e]*/
{
    SOCKET s_fd = (SOCKET)fd;
    return newPyEpoll_Object(type, FD_SETSIZE - 1, s_fd);
}


static PyObject *
pyepoll_internal_ctl(int epfd, int op, int fd, unsigned int events)
{
    struct epoll_event ev;
    int result;

    if (epfd < 0)
        return pyepoll_err_closed();

    switch (op) {
    case EPOLL_CTL_ADD:
    case EPOLL_CTL_MOD:
        ev.events = events;
        ev.data.fd = fd;
        Py_BEGIN_ALLOW_THREADS
        result = epoll_ctl(epfd, op, fd, &ev);
        Py_END_ALLOW_THREADS
        break;
    case EPOLL_CTL_DEL:
        /* In kernel versions before 2.6.9, the EPOLL_CTL_DEL
         * operation required a non-NULL pointer in event, even
         * though this argument is ignored. */
        Py_BEGIN_ALLOW_THREADS
        result = epoll_ctl(epfd, op, fd, &ev);
        Py_END_ALLOW_THREADS
        break;
    default:
        result = -1;
        errno = EINVAL;
    }

    if (result < 0) {
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }
    Py_RETURN_NONE;
}

/*[clinic input]
select.epoll.register

    fd: fildes
      the target file descriptor of the operation
    eventmask: unsigned_int(c_default="EPOLLIN | EPOLLPRI | EPOLLOUT", bitwise=True) = select.EPOLLIN | select.EPOLLPRI | select.EPOLLOUT
      a bit set composed of the various EPOLL constants

Registers a new fd or raises an OSError if the fd is already registered.

The epoll interface supports all file descriptors that support poll.
[clinic start generated code]*/

static PyObject *
select_epoll_register_impl(pyEpoll_Object *self, int fd,
                           unsigned int eventmask)
/*[clinic end generated code: output=318e5e6386520599 input=a5071b71edfe3578]*/
{
    return pyepoll_internal_ctl(self->epfd, EPOLL_CTL_ADD, fd, eventmask);
}

/*[clinic input]
select.epoll.modify

    fd: fildes
      the target file descriptor of the operation
    eventmask: unsigned_int(bitwise=True)
      a bit set composed of the various EPOLL constants

Modify event mask for a registered file descriptor.
[clinic start generated code]*/

static PyObject *
select_epoll_modify_impl(pyEpoll_Object *self, int fd,
                         unsigned int eventmask)
/*[clinic end generated code: output=7e3447307cff6f65 input=88a83dac53a8c3da]*/
{
    return pyepoll_internal_ctl(self->epfd, EPOLL_CTL_MOD, fd, eventmask);
}

/*[clinic input]
select.epoll.unregister

    fd: fildes
      the target file descriptor of the operation

Remove a registered file descriptor from the epoll object.
[clinic start generated code]*/

static PyObject *
select_epoll_unregister_impl(pyEpoll_Object *self, int fd)
/*[clinic end generated code: output=07c5dbd612a512d4 input=3093f68d3644743d]*/
{
    return pyepoll_internal_ctl(self->epfd, EPOLL_CTL_DEL, fd, 0);
}

/*[clinic input]
select.epoll.poll

    timeout as timeout_obj: object = None
      the maximum time to wait in seconds (as float);
      a timeout of None or -1 makes poll wait indefinitely
    maxevents: int = -1
      the maximum number of events returned; -1 means no limit

Wait for events on the epoll file descriptor.

Returns a list containing any descriptors that have events to report,
as a list of (fd, events) 2-tuples.
[clinic start generated code]*/

static PyObject *
select_epoll_poll_impl(pyEpoll_Object *self, PyObject *timeout_obj,
                       int maxevents)
/*[clinic end generated code: output=e02d121a20246c6c input=33d34a5ea430fd5b]*/
{
    int nfds, i;
    PyObject *elist = NULL, *etuple = NULL;
    struct epoll_event *evs = NULL;
    _PyTime_t timeout = -1, ms = -1, deadline = 0;

    if (self->epfd < 0)
        return pyepoll_err_closed();

    if (timeout_obj != Py_None) {
        /* epoll_wait() has a resolution of 1 millisecond, round towards
           infinity to wait at least timeout seconds. */
        if (_PyTime_FromSecondsObject(&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_CEILING);
        if (ms < INT_MIN || ms > INT_MAX) {
            PyErr_SetString(PyExc_OverflowError, "timeout is too large");
            return NULL;
        }
        /* epoll_wait(2) treats all arbitrary negative numbers the same
           for the timeout argument, but -1 is the documented way to block
           indefinitely in the epoll_wait(2) documentation, so we set ms
           to -1 if the value of ms is a negative number.

           Note that we didn't use INFTIM here since it's non-standard and
           isn't available under Linux. */
        if (ms < 0) {
            ms = -1;
        }

        if (timeout >= 0) {
            deadline = _PyTime_GetMonotonicClock() + timeout;
        }
    }

    if (maxevents == -1) {
        maxevents = FD_SETSIZE-1;
    }
    else if (maxevents < 1) {
        PyErr_Format(PyExc_ValueError,
                     "maxevents must be greater than 0, got %d",
                     maxevents);
        return NULL;
    }

    evs = PyMem_New(struct epoll_event, maxevents);
    if (evs == NULL) {
        PyErr_NoMemory();
        return NULL;
    }

    do {
        Py_BEGIN_ALLOW_THREADS
        errno = 0;
        nfds = epoll_wait(self->epfd, evs, maxevents, (int)ms);
        Py_END_ALLOW_THREADS

        if (errno != EINTR)
            break;

        /* poll() was interrupted by a signal */
        if (PyErr_CheckSignals())
            goto error;

        if (timeout >= 0) {
            timeout = deadline - _PyTime_GetMonotonicClock();
            if (timeout < 0) {
                nfds = 0;
                break;
            }
            ms = _PyTime_AsMilliseconds(timeout, _PyTime_ROUND_CEILING);
            /* retry epoll_wait() with the recomputed timeout */
        }
    } while(1);

    if (nfds < 0) {
        PyErr_SetFromErrno(PyExc_OSError);
        goto error;
    }

    elist = PyList_New(nfds);
    if (elist == NULL) {
        goto error;
    }

    for (i = 0; i < nfds; i++) {
        etuple = Py_BuildValue("iI", evs[i].data.fd, evs[i].events);
        if (etuple == NULL) {
            Py_CLEAR(elist);
            goto error;
        }
        PyList_SET_ITEM(elist, i, etuple);
    }

    error:
    PyMem_Free(evs);
    return elist;
}


/*[clinic input]
select.epoll.__enter__

[clinic start generated code]*/

static PyObject *
select_epoll___enter___impl(pyEpoll_Object *self)
/*[clinic end generated code: output=ab45d433504db2a0 input=3c22568587efeadb]*/
{
    if (self->epfd < 0)
        return pyepoll_err_closed();

    Py_INCREF(self);
    return (PyObject *)self;
}

/*[clinic input]
select.epoll.__exit__

    exc_type:  object = None
    exc_value: object = None
    exc_tb:    object = None
    /

[clinic start generated code]*/

static PyObject *
select_epoll___exit___impl(pyEpoll_Object *self, PyObject *exc_type,
                           PyObject *exc_value, PyObject *exc_tb)
/*[clinic end generated code: output=c480f38ce361748e input=7ae81a5a4c1a98d8]*/
{
    _selectstate *state = _selectstate_by_type(Py_TYPE(self));
    return PyObject_CallMethodObjArgs((PyObject *)self, state->close, NULL);
}

static PyGetSetDef pyepoll_getsetlist[] = {
    {"closed", (getter)pyepoll_get_closed, NULL,
     "True if the epoll handler is closed"},
    {0},
};

PyDoc_STRVAR(pyepoll_doc,
"select.epoll(sizehint=-1, flags=0)\n\
\n\
Returns an epolling object\n\
\n\
sizehint must be a positive integer or -1 for the default size. The\n\
sizehint is used to optimize internal data structures. It doesn't limit\n\
the maximum number of monitored events.");

#endif /* HAVE_EPOLL */

#ifdef HAVE_KQUEUE
/* **************************************************************************
 *                      kqueue interface for BSD
 *
 * Copyright (c) 2000 Doug White, 2006 James Knight, 2007 Christian Heimes
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifdef HAVE_SYS_EVENT_H
#include <sys/event.h>
#endif

PyDoc_STRVAR(kqueue_event_doc,
"kevent(ident, filter=KQ_FILTER_READ, flags=KQ_EV_ADD, fflags=0, data=0, udata=0)\n\
\n\
This object is the equivalent of the struct kevent for the C API.\n\
\n\
See the kqueue manpage for more detailed information about the meaning\n\
of the arguments.\n\
\n\
One minor note: while you might hope that udata could store a\n\
reference to a python object, it cannot, because it is impossible to\n\
keep a proper reference count of the object once it's passed into the\n\
kernel. Therefore, I have restricted it to only storing an integer.  I\n\
recommend ignoring it and simply using the 'ident' field to key off\n\
of. You could also set up a dictionary on the python side to store a\n\
udata->object mapping.");

typedef struct {
    PyObject_HEAD
    struct kevent e;
} kqueue_event_Object;

#define kqueue_event_Check(op, state) (PyObject_TypeCheck((op), state->kqueue_event_Type))

typedef struct {
    PyObject_HEAD
    SOCKET kqfd;                /* kqueue control fd */
} kqueue_queue_Object;

#if (SIZEOF_UINTPTR_T != SIZEOF_VOID_P)
#   error uintptr_t does not match void *!
#elif (SIZEOF_UINTPTR_T == SIZEOF_LONG_LONG)
#   define T_UINTPTRT         T_ULONGLONG
#   define T_INTPTRT          T_LONGLONG
#   define UINTPTRT_FMT_UNIT  "K"
#   define INTPTRT_FMT_UNIT   "L"
#elif (SIZEOF_UINTPTR_T == SIZEOF_LONG)
#   define T_UINTPTRT         T_ULONG
#   define T_INTPTRT          T_LONG
#   define UINTPTRT_FMT_UNIT  "k"
#   define INTPTRT_FMT_UNIT   "l"
#elif (SIZEOF_UINTPTR_T == SIZEOF_INT)
#   define T_UINTPTRT         T_UINT
#   define T_INTPTRT          T_INT
#   define UINTPTRT_FMT_UNIT  "I"
#   define INTPTRT_FMT_UNIT   "i"
#else
#   error uintptr_t does not match int, long, or long long!
#endif

#if SIZEOF_LONG_LONG == 8
#   define T_INT64          T_LONGLONG
#   define INT64_FMT_UNIT   "L"
#elif SIZEOF_LONG == 8
#   define T_INT64          T_LONG
#   define INT64_FMT_UNIT   "l"
#elif SIZEOF_INT == 8
#   define T_INT64          T_INT
#   define INT64_FMT_UNIT   "i"
#else
#   define INT64_FMT_UNIT   "_"
#endif

#if SIZEOF_LONG_LONG == 4
#   define T_UINT32         T_ULONGLONG
#   define UINT32_FMT_UNIT  "K"
#elif SIZEOF_LONG == 4
#   define T_UINT32         T_ULONG
#   define UINT32_FMT_UNIT  "k"
#elif SIZEOF_INT == 4
#   define T_UINT32         T_UINT
#   define UINT32_FMT_UNIT  "I"
#else
#   define UINT32_FMT_UNIT  "_"
#endif

/*
 * kevent is not standard and its members vary across BSDs.
 */
#ifdef __NetBSD__
#   define FILTER_TYPE      T_UINT32
#   define FILTER_FMT_UNIT  UINT32_FMT_UNIT
#   define FLAGS_TYPE       T_UINT32
#   define FLAGS_FMT_UNIT   UINT32_FMT_UNIT
#   define FFLAGS_TYPE      T_UINT32
#   define FFLAGS_FMT_UNIT  UINT32_FMT_UNIT
#else
#   define FILTER_TYPE      T_SHORT
#   define FILTER_FMT_UNIT  "h"
#   define FLAGS_TYPE       T_USHORT
#   define FLAGS_FMT_UNIT   "H"
#   define FFLAGS_TYPE      T_UINT
#   define FFLAGS_FMT_UNIT  "I"
#endif

#if defined(__NetBSD__) || defined(__OpenBSD__)
#   define DATA_TYPE        T_INT64
#   define DATA_FMT_UNIT    INT64_FMT_UNIT
#else
#   define DATA_TYPE        T_INTPTRT
#   define DATA_FMT_UNIT    INTPTRT_FMT_UNIT
#endif

/* Unfortunately, we can't store python objects in udata, because
 * kevents in the kernel can be removed without warning, which would
 * forever lose the refcount on the object stored with it.
 */

#define KQ_OFF(x) offsetof(kqueue_event_Object, x)
static struct PyMemberDef kqueue_event_members[] = {
    {"ident",           T_UINTPTRT,     KQ_OFF(e.ident)},
    {"filter",          FILTER_TYPE,    KQ_OFF(e.filter)},
    {"flags",           FLAGS_TYPE,     KQ_OFF(e.flags)},
    {"fflags",          T_UINT,         KQ_OFF(e.fflags)},
    {"data",            DATA_TYPE,      KQ_OFF(e.data)},
    {"udata",           T_UINTPTRT,     KQ_OFF(e.udata)},
    {NULL} /* Sentinel */
};
#undef KQ_OFF

static PyObject *

kqueue_event_repr(kqueue_event_Object *s)
{
    char buf[1024];
    PyOS_snprintf(
        buf, sizeof(buf),
        "<select.kevent ident=%zu filter=%d flags=0x%x fflags=0x%x "
        "data=0x%llx udata=%p>",
        (size_t)(s->e.ident), (int)s->e.filter, (unsigned int)s->e.flags,
        (unsigned int)s->e.fflags, (long long)(s->e.data), (void *)s->e.udata);
    return PyUnicode_FromString(buf);
}

static int
kqueue_event_init(kqueue_event_Object *self, PyObject *args, PyObject *kwds)
{
    PyObject *pfd;
    static char *kwlist[] = {"ident", "filter", "flags", "fflags",
                             "data", "udata", NULL};
    static const char fmt[] = "O|"
                FILTER_FMT_UNIT FLAGS_FMT_UNIT FFLAGS_FMT_UNIT DATA_FMT_UNIT
                UINTPTRT_FMT_UNIT ":kevent";

    EV_SET(&(self->e), 0, EVFILT_READ, EV_ADD, 0, 0, 0); /* defaults */

    if (!PyArg_ParseTupleAndKeywords(args, kwds, fmt, kwlist,
        &pfd, &(self->e.filter), &(self->e.flags),
        &(self->e.fflags), &(self->e.data), &(self->e.udata))) {
        return -1;
    }

    if (PyLong_Check(pfd)) {
        self->e.ident = PyLong_AsSize_t(pfd);
    }
    else {
        self->e.ident = PyObject_AsFileDescriptor(pfd);
    }
    if (PyErr_Occurred()) {
        return -1;
    }
    return 0;
}

static PyObject *
kqueue_event_richcompare(kqueue_event_Object *s, kqueue_event_Object *o,
                         int op)
{
    int result;
    _selectstate *state = _selectstate_by_type(Py_TYPE(s));

    if (!kqueue_event_Check(o, state)) {
        Py_RETURN_NOTIMPLEMENTED;
    }

#define CMP(a, b) ((a) != (b)) ? ((a) < (b) ? -1 : 1)
    result = CMP(s->e.ident, o->e.ident)
           : CMP(s->e.filter, o->e.filter)
           : CMP(s->e.flags, o->e.flags)
           : CMP(s->e.fflags, o->e.fflags)
           : CMP(s->e.data, o->e.data)
           : CMP((intptr_t)s->e.udata, (intptr_t)o->e.udata)
           : 0;
#undef CMP

    Py_RETURN_RICHCOMPARE(result, 0, op);
}

static PyType_Slot kqueue_event_Type_slots[] = {
    {Py_tp_doc, (void*)kqueue_event_doc},
    {Py_tp_init, kqueue_event_init},
    {Py_tp_members, kqueue_event_members},
    {Py_tp_new, PyType_GenericNew},
    {Py_tp_repr, kqueue_event_repr},
    {Py_tp_richcompare, kqueue_event_richcompare},
    {0, 0},
};

static PyType_Spec kqueue_event_Type_spec = {
    "select.kevent",
    sizeof(kqueue_event_Object),
    0,
    Py_TPFLAGS_DEFAULT,
    kqueue_event_Type_slots
};

static PyObject *
kqueue_queue_err_closed(void)
{
    PyErr_SetString(PyExc_ValueError, "I/O operation on closed kqueue object");
    return NULL;
}

static int
kqueue_queue_internal_close(kqueue_queue_Object *self)
{
    int save_errno = 0;
    if (self->kqfd >= 0) {
        int kqfd = self->kqfd;
        self->kqfd = -1;
        Py_BEGIN_ALLOW_THREADS
        if (close(kqfd) < 0)
            save_errno = errno;
        Py_END_ALLOW_THREADS
    }
    return save_errno;
}

static PyObject *
newKqueue_Object(PyTypeObject *type, SOCKET fd)
{
    kqueue_queue_Object *self;
    assert(type != NULL);
    allocfunc queue_alloc = PyType_GetSlot(type, Py_tp_alloc);
    assert(queue_alloc != NULL);
    self = (kqueue_queue_Object *) queue_alloc(type, 0);
    if (self == NULL) {
        return NULL;
    }

    if (fd == -1) {
        Py_BEGIN_ALLOW_THREADS
        self->kqfd = kqueue();
        Py_END_ALLOW_THREADS
    }
    else {
        self->kqfd = fd;
    }
    if (self->kqfd < 0) {
        Py_DECREF(self);
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }

    if (fd == -1) {
        if (_Py_set_inheritable(self->kqfd, 0, NULL) < 0) {
            Py_DECREF(self);
            return NULL;
        }
    }
    return (PyObject *)self;
}

/*[clinic input]
@classmethod
select.kqueue.__new__

Kqueue syscall wrapper.

For example, to start watching a socket for input:
>>> kq = kqueue()
>>> sock = socket()
>>> sock.connect((host, port))
>>> kq.control([kevent(sock, KQ_FILTER_WRITE, KQ_EV_ADD)], 0)

To wait one second for it to become writeable:
>>> kq.control(None, 1, 1000)

To stop listening:
>>> kq.control([kevent(sock, KQ_FILTER_WRITE, KQ_EV_DELETE)], 0)
[clinic start generated code]*/

static PyObject *
select_kqueue_impl(PyTypeObject *type)
/*[clinic end generated code: output=e0ff89f154d56236 input=cf625e49218366e8]*/
{
    return newKqueue_Object(type, -1);
}

static void
kqueue_queue_dealloc(kqueue_queue_Object *self)
{
    PyTypeObject* type = Py_TYPE(self);
    kqueue_queue_internal_close(self);
    freefunc kqueue_free = PyType_GetSlot(type, Py_tp_free);
    kqueue_free((PyObject *)self);
    Py_DECREF((PyObject *)type);
}

/*[clinic input]
select.kqueue.close

Close the kqueue control file descriptor.

Further operations on the kqueue object will raise an exception.
[clinic start generated code]*/

static PyObject *
select_kqueue_close_impl(kqueue_queue_Object *self)
/*[clinic end generated code: output=d1c7df0b407a4bc1 input=0b12d95430e0634c]*/
{
    errno = kqueue_queue_internal_close(self);
    if (errno < 0) {
        PyErr_SetFromErrno(PyExc_OSError);
        return NULL;
    }
    Py_RETURN_NONE;
}

static PyObject*
kqueue_queue_get_closed(kqueue_queue_Object *self, void *Py_UNUSED(ignored))
{
    if (self->kqfd < 0)
        Py_RETURN_TRUE;
    else
        Py_RETURN_FALSE;
}

/*[clinic input]
select.kqueue.fileno

Return the kqueue control file descriptor.
[clinic start generated code]*/

static PyObject *
select_kqueue_fileno_impl(kqueue_queue_Object *self)
/*[clinic end generated code: output=716f46112a4f6e5c input=41911c539ca2b0ca]*/
{
    if (self->kqfd < 0)
        return kqueue_queue_err_closed();
    return PyLong_FromLong(self->kqfd);
}

/*[clinic input]
@classmethod
select.kqueue.fromfd

    fd: int
    /

Create a kqueue object from a given control fd.
[clinic start generated code]*/

static PyObject *
select_kqueue_fromfd_impl(PyTypeObject *type, int fd)
/*[clinic end generated code: output=d02c3c7dc538a653 input=f6172a48ca4ecdd0]*/
{
    SOCKET s_fd = (SOCKET)fd;

    return newKqueue_Object(type, s_fd);
}

/*[clinic input]
select.kqueue.control

    changelist: object
        Must be an iterable of kevent objects describing the changes to be made
        to the kernel's watch list or None.
    maxevents: int
        The maximum number of events that the kernel will return.
    timeout as otimeout: object = None
        The maximum time to wait in seconds, or else None to wait forever.
        This accepts floats for smaller timeouts, too.
    /

Calls the kernel kevent function.
[clinic start generated code]*/

static PyObject *
select_kqueue_control_impl(kqueue_queue_Object *self, PyObject *changelist,
                           int maxevents, PyObject *otimeout)
/*[clinic end generated code: output=81324ff5130db7ae input=59c4e30811209c47]*/
{
    int gotevents = 0;
    int nchanges = 0;
    int i = 0;
    PyObject *seq = NULL, *ei = NULL;
    PyObject *result = NULL;
    struct kevent *evl = NULL;
    struct kevent *chl = NULL;
    struct timespec timeoutspec;
    struct timespec *ptimeoutspec;
    _PyTime_t timeout, deadline = 0;
    _selectstate *state = _selectstate_by_type(Py_TYPE(self));

    if (self->kqfd < 0)
        return kqueue_queue_err_closed();

    if (maxevents < 0) {
        PyErr_Format(PyExc_ValueError,
            "Length of eventlist must be 0 or positive, got %d",
            maxevents);
        return NULL;
    }

    if (otimeout == Py_None) {
        ptimeoutspec = NULL;
    }
    else {
        if (_PyTime_FromSecondsObject(&timeout,
                                      otimeout, _PyTime_ROUND_TIMEOUT) < 0) {
            PyErr_Format(PyExc_TypeError,
                "timeout argument must be a number "
                "or None, got %.200s",
                _PyType_Name(Py_TYPE(otimeout)));
            return NULL;
        }

        if (_PyTime_AsTimespec(timeout, &timeoutspec) == -1)
            return NULL;

        if (timeoutspec.tv_sec < 0) {
            PyErr_SetString(PyExc_ValueError,
                            "timeout must be positive or None");
            return NULL;
        }
        ptimeoutspec = &timeoutspec;
    }

    if (changelist != Py_None) {
        seq = PySequence_Fast(changelist, "changelist is not iterable");
        if (seq == NULL) {
            return NULL;
        }
        if (PySequence_Fast_GET_SIZE(seq) > INT_MAX) {
            PyErr_SetString(PyExc_OverflowError,
                            "changelist is too long");
            goto error;
        }
        nchanges = (int)PySequence_Fast_GET_SIZE(seq);

        chl = PyMem_New(struct kevent, nchanges);
        if (chl == NULL) {
            PyErr_NoMemory();
            goto error;
        }
        _selectstate *state = _selectstate_by_type(Py_TYPE(self));
        for (i = 0; i < nchanges; ++i) {
            ei = PySequence_Fast_GET_ITEM(seq, i);
            if (!kqueue_event_Check(ei, state)) {
                PyErr_SetString(PyExc_TypeError,
                    "changelist must be an iterable of "
                    "select.kevent objects");
                goto error;
            }
            chl[i] = ((kqueue_event_Object *)ei)->e;
        }
        Py_CLEAR(seq);
    }

    /* event list */
    if (maxevents) {
        evl = PyMem_New(struct kevent, maxevents);
        if (evl == NULL) {
            PyErr_NoMemory();
            goto error;
        }
    }

    if (ptimeoutspec)
        deadline = _PyTime_GetMonotonicClock() + timeout;

    do {
        Py_BEGIN_ALLOW_THREADS
        errno = 0;
        gotevents = kevent(self->kqfd, chl, nchanges,
                           evl, maxevents, ptimeoutspec);
        Py_END_ALLOW_THREADS

        if (errno != EINTR)
            break;

        /* kevent() was interrupted by a signal */
        if (PyErr_CheckSignals())
            goto error;

        if (ptimeoutspec) {
            timeout = deadline - _PyTime_GetMonotonicClock();
            if (timeout < 0) {
                gotevents = 0;
                break;
            }
            if (_PyTime_AsTimespec(timeout, &timeoutspec) == -1)
                goto error;
            /* retry kevent() with the recomputed timeout */
        }
    } while (1);

    if (gotevents == -1) {
        PyErr_SetFromErrno(PyExc_OSError);
        goto error;
    }

    result = PyList_New(gotevents);
    if (result == NULL) {
        goto error;
    }

    for (i = 0; i < gotevents; i++) {
        kqueue_event_Object *ch;

        ch = PyObject_New(kqueue_event_Object, state->kqueue_event_Type);
        if (ch == NULL) {
            goto error;
        }
        ch->e = evl[i];
        PyList_SET_ITEM(result, i, (PyObject *)ch);
    }
    PyMem_Free(chl);
    PyMem_Free(evl);
    return result;

    error:
    PyMem_Free(chl);
    PyMem_Free(evl);
    Py_XDECREF(result);
    Py_XDECREF(seq);
    return NULL;
}

static PyGetSetDef kqueue_queue_getsetlist[] = {
    {"closed", (getter)kqueue_queue_get_closed, NULL,
     "True if the kqueue handler is closed"},
    {0},
};

#endif /* HAVE_KQUEUE */


/* ************************************************************************ */

#include "clinic/selectmodule.c.h"

#if defined(HAVE_POLL) && !defined(HAVE_BROKEN_POLL)

static PyMethodDef poll_methods[] = {
    SELECT_POLL_REGISTER_METHODDEF
    SELECT_POLL_MODIFY_METHODDEF
    SELECT_POLL_UNREGISTER_METHODDEF
    SELECT_POLL_POLL_METHODDEF
    {NULL, NULL}           /* sentinel */
};


static PyType_Slot poll_Type_slots[] = {
    {Py_tp_dealloc, poll_dealloc},
    {Py_tp_methods, poll_methods},
    {0, 0},
};

static PyType_Spec poll_Type_spec = {
    .name = "select.poll",
    .basicsize = sizeof(pollObject),
    .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION,
    .slots = poll_Type_slots,
};

#ifdef HAVE_SYS_DEVPOLL_H

static PyMethodDef devpoll_methods[] = {
    SELECT_DEVPOLL_REGISTER_METHODDEF
    SELECT_DEVPOLL_MODIFY_METHODDEF
    SELECT_DEVPOLL_UNREGISTER_METHODDEF
    SELECT_DEVPOLL_POLL_METHODDEF
    SELECT_DEVPOLL_CLOSE_METHODDEF
    SELECT_DEVPOLL_FILENO_METHODDEF
    {NULL,              NULL}           /* sentinel */
};

#endif  /* HAVE_SYS_DEVPOLL_H */

#endif /* HAVE_POLL */

#ifdef HAVE_EPOLL

static PyMethodDef pyepoll_methods[] = {
    SELECT_EPOLL_FROMFD_METHODDEF
    SELECT_EPOLL_CLOSE_METHODDEF
    SELECT_EPOLL_FILENO_METHODDEF
    SELECT_EPOLL_MODIFY_METHODDEF
    SELECT_EPOLL_REGISTER_METHODDEF
    SELECT_EPOLL_UNREGISTER_METHODDEF
    SELECT_EPOLL_POLL_METHODDEF
    SELECT_EPOLL___ENTER___METHODDEF
    SELECT_EPOLL___EXIT___METHODDEF
    {NULL,      NULL},
};

static PyType_Slot pyEpoll_Type_slots[] = {
    {Py_tp_dealloc, pyepoll_dealloc},
    {Py_tp_doc, (void*)pyepoll_doc},
    {Py_tp_getattro, PyObject_GenericGetAttr},
    {Py_tp_getset, pyepoll_getsetlist},
    {Py_tp_methods, pyepoll_methods},
    {Py_tp_new, select_epoll},
    {0, 0},
};

static PyType_Spec pyEpoll_Type_spec = {
    "select.epoll",
    sizeof(pyEpoll_Object),
    0,
    Py_TPFLAGS_DEFAULT,
    pyEpoll_Type_slots
};

#endif /* HAVE_EPOLL */

#ifdef HAVE_KQUEUE

static PyMethodDef kqueue_queue_methods[] = {
    SELECT_KQUEUE_FROMFD_METHODDEF
    SELECT_KQUEUE_CLOSE_METHODDEF
    SELECT_KQUEUE_FILENO_METHODDEF
    SELECT_KQUEUE_CONTROL_METHODDEF
    {NULL,      NULL},
};

static PyType_Slot kqueue_queue_Type_slots[] = {
    {Py_tp_dealloc, kqueue_queue_dealloc},
    {Py_tp_doc, (void*)select_kqueue__doc__},
    {Py_tp_getset, kqueue_queue_getsetlist},
    {Py_tp_methods, kqueue_queue_methods},
    {Py_tp_new, select_kqueue},
    {0, 0},
};

static PyType_Spec kqueue_queue_Type_spec = {
    "select.kqueue",
    sizeof(kqueue_queue_Object),
    0,
    Py_TPFLAGS_DEFAULT,
    kqueue_queue_Type_slots
};

#endif /* HAVE_KQUEUE */





/* ************************************************************************ */


static PyMethodDef select_methods[] = {
    SELECT_SELECT_METHODDEF
    SELECT_POLL_METHODDEF
    SELECT_DEVPOLL_METHODDEF
    {0,         0},     /* sentinel */
};

PyDoc_STRVAR(module_doc,
"This module supports asynchronous I/O on multiple file descriptors.\n\
\n\
*** IMPORTANT NOTICE ***\n\
On Windows, only sockets are supported; on Unix, all file descriptors.");



static int
_select_traverse(PyObject *module, visitproc visit, void *arg)
{
    _selectstate *state = get_select_state(module);

    Py_VISIT(state->close);
    Py_VISIT(state->poll_Type);
    Py_VISIT(state->devpoll_Type);
    Py_VISIT(state->pyEpoll_Type);
    Py_VISIT(state->kqueue_event_Type);
    Py_VISIT(state->kqueue_queue_Type);
    return 0;
}

static int
_select_clear(PyObject *module)
{
    _selectstate *state = get_select_state(module);

    Py_CLEAR(state->close);
    Py_CLEAR(state->poll_Type);
    Py_CLEAR(state->devpoll_Type);
    Py_CLEAR(state->pyEpoll_Type);
    Py_CLEAR(state->kqueue_event_Type);
    Py_CLEAR(state->kqueue_queue_Type);
    return 0;
}

static void
_select_free(void *module)
{
    _select_clear((PyObject *)module);
}

int
_select_exec(PyObject *m)
{
    _selectstate *state = get_select_state(m);

    state->close = PyUnicode_InternFromString("close");
    if (state->close == NULL) {
        return -1;
    }
    if (PyModule_AddObjectRef(m, "error", PyExc_OSError) < 0) {
        return -1;
    }

#ifdef PIPE_BUF
#ifdef HAVE_BROKEN_PIPE_BUF
#undef PIPE_BUF
#define PIPE_BUF 512
#endif
    PyModule_AddIntMacro(m, PIPE_BUF);
#endif

#if defined(HAVE_POLL) && !defined(HAVE_BROKEN_POLL)
#ifdef __APPLE__
    if (select_have_broken_poll()) {
        if (PyObject_DelAttrString(m, "poll") == -1) {
            PyErr_Clear();
        }
    } else {
#else
    {
#endif
        state->poll_Type = (PyTypeObject *)PyType_FromModuleAndSpec(
            m, &poll_Type_spec, NULL);
        if (state->poll_Type == NULL) {
            return -1;
        }

        PyModule_AddIntMacro(m, POLLIN);
        PyModule_AddIntMacro(m, POLLPRI);
        PyModule_AddIntMacro(m, POLLOUT);
        PyModule_AddIntMacro(m, POLLERR);
        PyModule_AddIntMacro(m, POLLHUP);
        PyModule_AddIntMacro(m, POLLNVAL);

#ifdef POLLRDNORM
        PyModule_AddIntMacro(m, POLLRDNORM);
#endif
#ifdef POLLRDBAND
        PyModule_AddIntMacro(m, POLLRDBAND);
#endif
#ifdef POLLWRNORM
        PyModule_AddIntMacro(m, POLLWRNORM);
#endif
#ifdef POLLWRBAND
        PyModule_AddIntMacro(m, POLLWRBAND);
#endif
#ifdef POLLMSG
        PyModule_AddIntMacro(m, POLLMSG);
#endif
#ifdef POLLRDHUP
        /* Kernel 2.6.17+ */
        PyModule_AddIntMacro(m, POLLRDHUP);
#endif
    }
#endif /* HAVE_POLL */

#ifdef HAVE_SYS_DEVPOLL_H
    state->devpoll_Type = (PyTypeObject *)PyType_FromModuleAndSpec(
        m, &devpoll_Type_spec, NULL);
    if (state->devpoll_Type == NULL) {
        return -1;
    }
#endif

#ifdef HAVE_EPOLL
    state->pyEpoll_Type = (PyTypeObject *)PyType_FromModuleAndSpec(
        m, &pyEpoll_Type_spec, NULL);
    if (state->pyEpoll_Type == NULL) {
        return -1;
    }
    if (PyModule_AddType(m, state->pyEpoll_Type) < 0) {
        return -1;
    }

    PyModule_AddIntMacro(m, EPOLLIN);
    PyModule_AddIntMacro(m, EPOLLOUT);
    PyModule_AddIntMacro(m, EPOLLPRI);
    PyModule_AddIntMacro(m, EPOLLERR);
    PyModule_AddIntMacro(m, EPOLLHUP);
#ifdef EPOLLRDHUP
    /* Kernel 2.6.17 */
    PyModule_AddIntMacro(m, EPOLLRDHUP);
#endif
    PyModule_AddIntMacro(m, EPOLLET);
#ifdef EPOLLONESHOT
    /* Kernel 2.6.2+ */
    PyModule_AddIntMacro(m, EPOLLONESHOT);
#endif
#ifdef EPOLLEXCLUSIVE
    PyModule_AddIntMacro(m, EPOLLEXCLUSIVE);
#endif

#ifdef EPOLLRDNORM
    PyModule_AddIntMacro(m, EPOLLRDNORM);
#endif
#ifdef EPOLLRDBAND
    PyModule_AddIntMacro(m, EPOLLRDBAND);
#endif
#ifdef EPOLLWRNORM
    PyModule_AddIntMacro(m, EPOLLWRNORM);
#endif
#ifdef EPOLLWRBAND
    PyModule_AddIntMacro(m, EPOLLWRBAND);
#endif
#ifdef EPOLLMSG
    PyModule_AddIntMacro(m, EPOLLMSG);
#endif

#ifdef EPOLL_CLOEXEC
    PyModule_AddIntMacro(m, EPOLL_CLOEXEC);
#endif
#endif /* HAVE_EPOLL */

#ifdef HAVE_KQUEUE
    state->kqueue_event_Type = (PyTypeObject *)PyType_FromModuleAndSpec(
        m, &kqueue_event_Type_spec, NULL);
    if (state->kqueue_event_Type == NULL) {
        return -1;
    }
    if (PyModule_AddType(m, state->kqueue_event_Type) < 0) {
        return -1;
    }

    state->kqueue_queue_Type = (PyTypeObject *)PyType_FromModuleAndSpec(
        m, &kqueue_queue_Type_spec, NULL);
    if (state->kqueue_queue_Type == NULL) {
        return -1;
    }
    if (PyModule_AddType(m, state->kqueue_queue_Type) < 0) {
        return -1;
    }

    /* event filters */
    PyModule_AddIntConstant(m, "KQ_FILTER_READ", EVFILT_READ);
    PyModule_AddIntConstant(m, "KQ_FILTER_WRITE", EVFILT_WRITE);
#ifdef EVFILT_AIO
    PyModule_AddIntConstant(m, "KQ_FILTER_AIO", EVFILT_AIO);
#endif
#ifdef EVFILT_VNODE
    PyModule_AddIntConstant(m, "KQ_FILTER_VNODE", EVFILT_VNODE);
#endif
#ifdef EVFILT_PROC
    PyModule_AddIntConstant(m, "KQ_FILTER_PROC", EVFILT_PROC);
#endif
#ifdef EVFILT_NETDEV
    PyModule_AddIntConstant(m, "KQ_FILTER_NETDEV", EVFILT_NETDEV);
#endif
#ifdef EVFILT_SIGNAL
    PyModule_AddIntConstant(m, "KQ_FILTER_SIGNAL", EVFILT_SIGNAL);
#endif
    PyModule_AddIntConstant(m, "KQ_FILTER_TIMER", EVFILT_TIMER);

    /* event flags */
    PyModule_AddIntConstant(m, "KQ_EV_ADD", EV_ADD);
    PyModule_AddIntConstant(m, "KQ_EV_DELETE", EV_DELETE);
    PyModule_AddIntConstant(m, "KQ_EV_ENABLE", EV_ENABLE);
    PyModule_AddIntConstant(m, "KQ_EV_DISABLE", EV_DISABLE);
    PyModule_AddIntConstant(m, "KQ_EV_ONESHOT", EV_ONESHOT);
    PyModule_AddIntConstant(m, "KQ_EV_CLEAR", EV_CLEAR);

#ifdef EV_SYSFLAGS
    PyModule_AddIntConstant(m, "KQ_EV_SYSFLAGS", EV_SYSFLAGS);
#endif
#ifdef EV_FLAG1
    PyModule_AddIntConstant(m, "KQ_EV_FLAG1", EV_FLAG1);
#endif

    PyModule_AddIntConstant(m, "KQ_EV_EOF", EV_EOF);
    PyModule_AddIntConstant(m, "KQ_EV_ERROR", EV_ERROR);

    /* READ WRITE filter flag */
#ifdef NOTE_LOWAT
    PyModule_AddIntConstant(m, "KQ_NOTE_LOWAT", NOTE_LOWAT);
#endif

    /* VNODE filter flags  */
#ifdef EVFILT_VNODE
    PyModule_AddIntConstant(m, "KQ_NOTE_DELETE", NOTE_DELETE);
    PyModule_AddIntConstant(m, "KQ_NOTE_WRITE", NOTE_WRITE);
    PyModule_AddIntConstant(m, "KQ_NOTE_EXTEND", NOTE_EXTEND);
    PyModule_AddIntConstant(m, "KQ_NOTE_ATTRIB", NOTE_ATTRIB);
    PyModule_AddIntConstant(m, "KQ_NOTE_LINK", NOTE_LINK);
    PyModule_AddIntConstant(m, "KQ_NOTE_RENAME", NOTE_RENAME);
    PyModule_AddIntConstant(m, "KQ_NOTE_REVOKE", NOTE_REVOKE);
#endif

    /* PROC filter flags  */
#ifdef EVFILT_PROC
    PyModule_AddIntConstant(m, "KQ_NOTE_EXIT", NOTE_EXIT);
    PyModule_AddIntConstant(m, "KQ_NOTE_FORK", NOTE_FORK);
    PyModule_AddIntConstant(m, "KQ_NOTE_EXEC", NOTE_EXEC);
    PyModule_AddIntConstant(m, "KQ_NOTE_PCTRLMASK", NOTE_PCTRLMASK);
    PyModule_AddIntConstant(m, "KQ_NOTE_PDATAMASK", NOTE_PDATAMASK);

    PyModule_AddIntConstant(m, "KQ_NOTE_TRACK", NOTE_TRACK);
    PyModule_AddIntConstant(m, "KQ_NOTE_CHILD", NOTE_CHILD);
    PyModule_AddIntConstant(m, "KQ_NOTE_TRACKERR", NOTE_TRACKERR);
#endif

    /* NETDEV filter flags */
#ifdef EVFILT_NETDEV
    PyModule_AddIntConstant(m, "KQ_NOTE_LINKUP", NOTE_LINKUP);
    PyModule_AddIntConstant(m, "KQ_NOTE_LINKDOWN", NOTE_LINKDOWN);
    PyModule_AddIntConstant(m, "KQ_NOTE_LINKINV", NOTE_LINKINV);
#endif

#endif /* HAVE_KQUEUE */
    return 0;
}

static PyModuleDef_Slot _select_slots[] = {
    {Py_mod_exec, _select_exec},
    {0, NULL}
};

static struct PyModuleDef selectmodule = {
    PyModuleDef_HEAD_INIT,
    .m_name = "select",
    .m_doc = module_doc,


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