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/* $OpenBSD: uthread_poll.c,v 1.15 2007/05/21 16:50:36 kurt Exp $ */
/*
* Copyright (c) 1999 Daniel Eischen <eischen@vigrid.com>
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Daniel Eischen.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN 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.
*
* $FreeBSD: uthread_poll.c,v 1.4 1999/08/30 00:02:08 deischen Exp $
*/
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <poll.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/fcntl.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"
int
poll(struct pollfd fds[], nfds_t nfds, int timeout)
{
struct pthread *curthread = _get_curthread();
struct timespec ts;
nfds_t n, numfds = nfds;
int ret = 0;
struct pthread_poll_data data;
/* This is a cancellation point: */
_thread_enter_cancellation_point();
if (numfds > _thread_max_pfdtsize) {
numfds = _thread_max_pfdtsize;
}
/* Check if a timeout was specified: */
if (timeout == INFTIM) {
/* Wait for ever: */
_thread_kern_set_timeout(NULL);
} else if (timeout > 0) {
/* Convert the timeout in msec to a timespec: */
ts.tv_sec = timeout / 1000;
ts.tv_nsec = (timeout % 1000) * 1000000;
/* Set the wake up time: */
_thread_kern_set_timeout(&ts);
} else if (timeout < 0) {
/* a timeout less than zero but not == INFTIM is invalid */
errno = EINVAL;
_thread_leave_cancellation_point();
return (-1);
}
if (((ret = _thread_sys_poll(fds, numfds, 0)) == 0) && (timeout != 0)) {
data.nfds = numfds;
data.fds = fds;
/*
* Clear revents in case of a timeout which leaves fds
* unchanged:
*/
for (n = 0; n < numfds; n++) {
fds[n].revents = 0;
}
curthread->data.poll_data = &data;
curthread->interrupted = 0;
_thread_kern_sched_state(PS_POLL_WAIT, __FILE__, __LINE__);
if (curthread->interrupted) {
errno = EINTR;
ret = -1;
} else {
ret = (int)data.nfds;
}
}
/* No longer in a cancellation point: */
_thread_leave_cancellation_point();
return (ret);
}
#endif
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