95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/* $NetBSD: poll.c,v 1.3 2008/04/29 05:46:08 martin Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2003 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Charles Blundell.
|
|
*
|
|
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#include <unistd.h>
|
|
#include <sys/poll.h>
|
|
#include <errno.h>
|
|
|
|
int
|
|
poll(struct pollfd *p, nfds_t nfds, int timout)
|
|
{
|
|
fd_set read, write, except;
|
|
struct timeval tv;
|
|
nfds_t i;
|
|
int highfd, rval;
|
|
|
|
/*
|
|
* select cannot tell us much wrt POLL*BAND, POLLPRI, POLLHUP or
|
|
* POLLNVAL.
|
|
*/
|
|
FD_ZERO(&read);
|
|
FD_ZERO(&write);
|
|
FD_ZERO(&except);
|
|
|
|
highfd = -1;
|
|
for (i = 0; i < nfds; i++) {
|
|
if (p[i].fd < 0)
|
|
continue;
|
|
if (p[i].fd >= FD_SETSIZE) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
if (p[i].fd > highfd)
|
|
highfd = p[i].fd;
|
|
|
|
if (p[i].events & (POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI))
|
|
FD_SET(p[i].fd, &read);
|
|
if (p[i].events & (POLLOUT|POLLWRNORM|POLLWRBAND))
|
|
FD_SET(p[i].fd, &write);
|
|
FD_SET(p[i].fd, &except);
|
|
}
|
|
|
|
tv.tv_sec = timout / 1000;
|
|
tv.tv_usec = (timout % 1000) * 1000;
|
|
|
|
rval = select(highfd + 1, &read, &write, &except,
|
|
timout == -1 ? NULL : &tv);
|
|
if (rval <= 0)
|
|
return rval;
|
|
|
|
rval = 0;
|
|
for (i = 0; i < nfds; i++) {
|
|
p[i].revents = 0;
|
|
if (FD_ISSET(p[i].fd, &read))
|
|
p[i].revents |= POLLIN|POLLRDNORM|POLLRDBAND|POLLPRI;
|
|
if (FD_ISSET(p[i].fd, &write))
|
|
p[i].revents |= POLLOUT|POLLWRNORM|POLLWRBAND;
|
|
if (FD_ISSET(p[i].fd, &except))
|
|
p[i].revents |= POLLERR;
|
|
/* XXX: POLLHUP/POLLNVAL? */
|
|
if (p[i].revents != 0)
|
|
rval++;
|
|
}
|
|
return rval;
|
|
}
|