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/* $Id$ */
/***
Copyright (C) 1994, 1996, 1997 Free Software Foundation, Inc.
Copyright (C) 2005, Cendio AB.
This file is part of PulseAudio.
Based on work for the GNU C Library.
PulseAudio is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published
by the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with PulseAudio; If not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
***/
/* Poll the file descriptors described by the NFDS structures starting at
FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
an event to occur; if TIMEOUT is -1, block until an event occurs.
Returns the number of file descriptors with events, zero if timed out,
or -1 for errors. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include "winsock.h"
#ifndef HAVE_SYS_POLL_H
#include <pulsecore/core-util.h>
#include "poll.h"
int poll (struct pollfd *fds, unsigned long int nfds, int timeout) {
struct timeval tv;
fd_set rset, wset, xset;
struct pollfd *f;
int ready;
int maxfd = 0;
char data[64];
FD_ZERO (&rset);
FD_ZERO (&wset);
FD_ZERO (&xset);
if (nfds == 0) {
if (timeout >= 0) {
pa_msleep(timeout);
return 0;
}
#ifdef OS_IS_WIN32
/*
* Windows does not support signals properly so waiting for them would
* mean a deadlock.
*/
pa_msleep(100);
return 0;
#else
return select(0, NULL, NULL, NULL, NULL);
#endif
}
for (f = fds; f < &fds[nfds]; ++f) {
if (f->fd != -1) {
if (f->events & POLLIN)
FD_SET (f->fd, &rset);
if (f->events & POLLOUT)
FD_SET (f->fd, &wset);
if (f->events & POLLPRI)
FD_SET (f->fd, &xset);
if (f->fd > maxfd && (f->events & (POLLIN|POLLOUT|POLLPRI)))
maxfd = f->fd;
}
}
tv.tv_sec = timeout / 1000;
tv.tv_usec = (timeout % 1000) * 1000;
ready = select ((SELECT_TYPE_ARG1) maxfd + 1, SELECT_TYPE_ARG234 &rset,
SELECT_TYPE_ARG234 &wset, SELECT_TYPE_ARG234 &xset,
SELECT_TYPE_ARG5 (timeout == -1 ? NULL : &tv));
if ((ready == -1) && (errno == EBADF)) {
ready = 0;
FD_ZERO (&rset);
FD_ZERO (&wset);
FD_ZERO (&xset);
maxfd = -1;
for (f = fds; f < &fds[nfds]; ++f) {
if (f->fd != -1) {
fd_set sngl_rset, sngl_wset, sngl_xset;
FD_ZERO (&sngl_rset);
FD_ZERO (&sngl_wset);
FD_ZERO (&sngl_xset);
if (f->events & POLLIN)
FD_SET (f->fd, &sngl_rset);
if (f->events & POLLOUT)
FD_SET (f->fd, &sngl_wset);
if (f->events & POLLPRI)
FD_SET (f->fd, &sngl_xset);
if (f->events & (POLLIN|POLLOUT|POLLPRI)) {
struct timeval singl_tv;
singl_tv.tv_sec = 0;
singl_tv.tv_usec = 0;
if (select((SELECT_TYPE_ARG1) f->fd, SELECT_TYPE_ARG234 &rset,
SELECT_TYPE_ARG234 &wset, SELECT_TYPE_ARG234 &xset,
SELECT_TYPE_ARG5 &singl_tv) != -1) {
if (f->events & POLLIN)
FD_SET (f->fd, &rset);
if (f->events & POLLOUT)
FD_SET (f->fd, &wset);
if (f->events & POLLPRI)
FD_SET (f->fd, &xset);
if (f->fd > maxfd && (f->events & (POLLIN|POLLOUT|POLLPRI)))
maxfd = f->fd;
++ready;
} else if (errno == EBADF)
f->revents |= POLLNVAL;
}
}
}
if (ready) {
/* Linux alters the tv struct... but it shouldn't matter here ...
* as we're going to be a little bit out anyway as we've just eaten
* more than a couple of cpu cycles above */
ready = select ((SELECT_TYPE_ARG1) maxfd + 1, SELECT_TYPE_ARG234 &rset,
SELECT_TYPE_ARG234 &wset, SELECT_TYPE_ARG234 &xset,
SELECT_TYPE_ARG5 (timeout == -1 ? NULL : &tv));
}
}
#ifdef OS_IS_WIN32
errno = WSAGetLastError();
#endif
if (ready > 0) {
ready = 0;
for (f = fds; f < &fds[nfds]; ++f) {
f->revents = 0;
if (f->fd != -1) {
if (FD_ISSET (f->fd, &rset)) {
/* support for POLLHUP. An hung up descriptor does not
increase the return value! */
if (recv (f->fd, data, 64, MSG_PEEK) == -1) {
if (errno == ESHUTDOWN || errno == ECONNRESET ||
errno == ECONNABORTED || errno == ENETRESET) {
fprintf(stderr, "Hangup\n");
f->revents |= POLLHUP;
}
}
if (f->revents == 0)
f->revents |= POLLIN;
}
if (FD_ISSET (f->fd, &wset))
f->revents |= POLLOUT;
if (FD_ISSET (f->fd, &xset))
f->revents |= POLLPRI;
}
if (f->revents)
ready++;
}
}
return ready;
}
#endif /* HAVE_SYS_POLL_H */
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