mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-02 15:03:41 +00:00
209 lines
6.0 KiB
C
209 lines
6.0 KiB
C
/*
|
|
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
|
|
* 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 John Birrell.
|
|
* 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 JOHN BIRRELL 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <poll.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/param.h>
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#include <sys/fcntl.h>
|
|
#ifdef _THREAD_SAFE
|
|
#include <pthread.h>
|
|
#include "pthread_private.h"
|
|
|
|
int
|
|
_select(int numfds, fd_set * readfds, fd_set * writefds, fd_set * exceptfds,
|
|
struct timeval * timeout)
|
|
{
|
|
struct timespec ts;
|
|
int i, ret = 0, f_wait = 1;
|
|
int pfd_index, got_one = 0, fd_count = 0;
|
|
struct pthread_poll_data data;
|
|
|
|
if (numfds > _thread_dtablesize) {
|
|
numfds = _thread_dtablesize;
|
|
}
|
|
/* Check if a timeout was specified: */
|
|
if (timeout) {
|
|
if (timeout->tv_sec < 0 ||
|
|
timeout->tv_usec < 0 || timeout->tv_usec >= 1000000) {
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
|
|
/* Convert the timeval to a timespec: */
|
|
TIMEVAL_TO_TIMESPEC(timeout, &ts);
|
|
|
|
/* Set the wake up time: */
|
|
_thread_kern_set_timeout(&ts);
|
|
if (ts.tv_sec == 0 && ts.tv_nsec == 0)
|
|
f_wait = 0;
|
|
} else {
|
|
/* Wait for ever: */
|
|
_thread_kern_set_timeout(NULL);
|
|
}
|
|
|
|
/* Count the number of file descriptors to be polled: */
|
|
if (readfds || writefds || exceptfds) {
|
|
for (i = 0; i < numfds; i++) {
|
|
if ((readfds && FD_ISSET(i, readfds)) ||
|
|
(exceptfds && FD_ISSET(i, exceptfds)) ||
|
|
(writefds && FD_ISSET(i, writefds))) {
|
|
fd_count++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Allocate memory for poll data if it hasn't already been
|
|
* allocated or if previously allocated memory is insufficient.
|
|
*/
|
|
if ((_thread_run->poll_data.fds == NULL) ||
|
|
(_thread_run->poll_data.nfds < fd_count)) {
|
|
data.fds = (struct pollfd *) realloc(_thread_run->poll_data.fds,
|
|
sizeof(struct pollfd) * MAX(128, fd_count));
|
|
if (data.fds == NULL) {
|
|
errno = ENOMEM;
|
|
ret = -1;
|
|
}
|
|
else {
|
|
/*
|
|
* Note that the threads poll data always
|
|
* indicates what is allocated, not what is
|
|
* currently being polled.
|
|
*/
|
|
_thread_run->poll_data.fds = data.fds;
|
|
_thread_run->poll_data.nfds = MAX(128, fd_count);
|
|
}
|
|
}
|
|
if (ret == 0) {
|
|
/* Setup the wait data. */
|
|
data.fds = _thread_run->poll_data.fds;
|
|
data.nfds = fd_count;
|
|
|
|
/*
|
|
* Setup the array of pollfds. Optimize this by
|
|
* running the loop in reverse and stopping when
|
|
* the number of selected file descriptors is reached.
|
|
*/
|
|
for (i = numfds - 1, pfd_index = fd_count - 1;
|
|
(i >= 0) && (pfd_index >= 0); i--) {
|
|
data.fds[pfd_index].events = 0;
|
|
if (readfds && FD_ISSET(i, readfds)) {
|
|
data.fds[pfd_index].events = POLLRDNORM;
|
|
}
|
|
if (exceptfds && FD_ISSET(i, exceptfds)) {
|
|
data.fds[pfd_index].events |= POLLRDBAND;
|
|
}
|
|
if (writefds && FD_ISSET(i, writefds)) {
|
|
data.fds[pfd_index].events |= POLLWRNORM;
|
|
}
|
|
if (data.fds[pfd_index].events != 0) {
|
|
/*
|
|
* Set the file descriptor to be polled and
|
|
* clear revents in case of a timeout which
|
|
* leaves fds unchanged:
|
|
*/
|
|
data.fds[pfd_index].fd = i;
|
|
data.fds[pfd_index].revents = 0;
|
|
pfd_index--;
|
|
}
|
|
}
|
|
if (((ret = _thread_sys_poll(data.fds, data.nfds, 0)) == 0) &&
|
|
(f_wait != 0)) {
|
|
_thread_run->data.poll_data = &data;
|
|
_thread_run->interrupted = 0;
|
|
_thread_kern_sched_state(PS_SELECT_WAIT, __FILE__, __LINE__);
|
|
if (_thread_run->interrupted) {
|
|
errno = EINTR;
|
|
data.nfds = 0;
|
|
ret = -1;
|
|
} else
|
|
ret = data.nfds;
|
|
}
|
|
}
|
|
|
|
if (ret >= 0) {
|
|
numfds = 0;
|
|
for (i = 0; i < fd_count; i++) {
|
|
/*
|
|
* Check the results of the poll and clear
|
|
* this file descriptor from the fdset if
|
|
* the requested event wasn't ready.
|
|
*/
|
|
got_one = 0;
|
|
if (readfds != NULL) {
|
|
if (FD_ISSET(data.fds[i].fd, readfds)) {
|
|
if (data.fds[i].revents & (POLLIN |
|
|
POLLRDNORM))
|
|
got_one = 1;
|
|
else
|
|
FD_CLR(data.fds[i].fd, readfds);
|
|
}
|
|
}
|
|
if (writefds != NULL) {
|
|
if (FD_ISSET(data.fds[i].fd, writefds)) {
|
|
if (data.fds[i].revents & (POLLOUT |
|
|
POLLWRNORM | POLLWRBAND))
|
|
got_one = 1;
|
|
else
|
|
FD_CLR(data.fds[i].fd,
|
|
writefds);
|
|
}
|
|
}
|
|
if (exceptfds != NULL) {
|
|
if (FD_ISSET(data.fds[i].fd, exceptfds)) {
|
|
if (data.fds[i].revents & (POLLRDBAND |
|
|
POLLPRI | POLLHUP | POLLERR |
|
|
POLLNVAL))
|
|
got_one = 1;
|
|
else
|
|
FD_CLR(data.fds[i].fd,
|
|
exceptfds);
|
|
}
|
|
}
|
|
if (got_one)
|
|
numfds++;
|
|
}
|
|
ret = numfds;
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
__strong_reference(_select, select);
|
|
#endif
|