100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
/*
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* Copyright (c) 1999 Daniel Eischen <eischen@vigrid.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Daniel Eischen.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <poll.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/fcntl.h>
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#include <pthread.h>
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#include "pthread_private.h"
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__weak_reference(_poll, poll);
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int
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_poll(struct pollfd *fds, unsigned int nfds, int timeout)
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{
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struct pthread *curthread = _get_curthread();
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struct timespec ts;
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int numfds = nfds;
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int i, ret = 0;
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struct pthread_poll_data data;
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if (numfds > _thread_dtablesize) {
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numfds = _thread_dtablesize;
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}
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/* Check if a timeout was specified: */
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if (timeout == INFTIM) {
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/* Wait for ever: */
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_thread_kern_set_timeout(NULL);
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} else if (timeout > 0) {
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/* Convert the timeout in msec to a timespec: */
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ts.tv_sec = timeout / 1000;
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ts.tv_nsec = (timeout % 1000) * 1000000;
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/* Set the wake up time: */
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_thread_kern_set_timeout(&ts);
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} else if (timeout < 0) {
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/* a timeout less than zero but not == INFTIM is invalid */
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errno = EINVAL;
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return (-1);
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}
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if (((ret = __sys_poll(fds, numfds, 0)) == 0) && (timeout != 0)) {
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data.nfds = numfds;
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data.fds = fds;
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/*
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* Clear revents in case of a timeout which leaves fds
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* unchanged:
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*/
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for (i = 0; i < numfds; i++) {
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fds[i].revents = 0;
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}
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curthread->data.poll_data = &data;
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curthread->interrupted = 0;
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_thread_kern_sched_state(PS_POLL_WAIT, __FILE__, __LINE__);
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if (curthread->interrupted) {
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errno = EINTR;
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ret = -1;
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} else {
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ret = data.nfds;
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}
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}
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return (ret);
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}
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