afa4625307
file descriptor bit if poll() returns POLLERR, POLLHUP, or POLLNVAL. Othewise, it's possible for select() to return successfully but with no bits set. Reviewed by: deischen MFC after: 3 days PR: bin/42175
232 lines
6.5 KiB
C
232 lines
6.5 KiB
C
/*
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* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
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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 John Birrell.
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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 JOHN BIRRELL 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 <poll.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/param.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(__select, select);
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int
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_select(int numfds, fd_set * readfds, fd_set * writefds, fd_set * exceptfds,
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struct timeval * 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 i, ret = 0, f_wait = 1;
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int pfd_index, got_events = 0, fd_count = 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) {
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if (timeout->tv_sec < 0 ||
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timeout->tv_usec < 0 || timeout->tv_usec >= 1000000) {
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errno = EINVAL;
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return (-1);
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}
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/* Convert the timeval to a timespec: */
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TIMEVAL_TO_TIMESPEC(timeout, &ts);
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/* Set the wake up time: */
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_thread_kern_set_timeout(&ts);
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if (ts.tv_sec == 0 && ts.tv_nsec == 0)
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f_wait = 0;
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} else {
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/* Wait for ever: */
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_thread_kern_set_timeout(NULL);
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}
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/* Count the number of file descriptors to be polled: */
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if (readfds || writefds || exceptfds) {
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for (i = 0; i < numfds; i++) {
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if ((readfds && FD_ISSET(i, readfds)) ||
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(exceptfds && FD_ISSET(i, exceptfds)) ||
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(writefds && FD_ISSET(i, writefds))) {
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fd_count++;
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}
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}
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}
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/*
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* Allocate memory for poll data if it hasn't already been
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* allocated or if previously allocated memory is insufficient.
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*/
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if ((curthread->poll_data.fds == NULL) ||
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(curthread->poll_data.nfds < fd_count)) {
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data.fds = (struct pollfd *) realloc(curthread->poll_data.fds,
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sizeof(struct pollfd) * MAX(128, fd_count));
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if (data.fds == NULL) {
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errno = ENOMEM;
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ret = -1;
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}
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else {
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/*
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* Note that the threads poll data always
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* indicates what is allocated, not what is
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* currently being polled.
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*/
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curthread->poll_data.fds = data.fds;
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curthread->poll_data.nfds = MAX(128, fd_count);
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}
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}
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if (ret == 0) {
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/* Setup the wait data. */
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data.fds = curthread->poll_data.fds;
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data.nfds = fd_count;
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/*
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* Setup the array of pollfds. Optimize this by
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* running the loop in reverse and stopping when
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* the number of selected file descriptors is reached.
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*/
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for (i = numfds - 1, pfd_index = fd_count - 1;
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(i >= 0) && (pfd_index >= 0); i--) {
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data.fds[pfd_index].events = 0;
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if (readfds && FD_ISSET(i, readfds)) {
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data.fds[pfd_index].events = POLLRDNORM;
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}
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if (exceptfds && FD_ISSET(i, exceptfds)) {
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data.fds[pfd_index].events |= POLLRDBAND;
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}
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if (writefds && FD_ISSET(i, writefds)) {
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data.fds[pfd_index].events |= POLLWRNORM;
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}
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if (data.fds[pfd_index].events != 0) {
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/*
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* Set the file descriptor to be polled and
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* clear revents in case of a timeout which
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* leaves fds unchanged:
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*/
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data.fds[pfd_index].fd = i;
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data.fds[pfd_index].revents = 0;
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pfd_index--;
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}
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}
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if (((ret = __sys_poll(data.fds, data.nfds, 0)) == 0) &&
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(f_wait != 0)) {
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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_SELECT_WAIT, __FILE__, __LINE__);
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if (curthread->interrupted) {
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errno = EINTR;
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data.nfds = 0;
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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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if (ret >= 0) {
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numfds = 0;
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for (i = 0; i < fd_count; i++) {
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/*
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* Check the results of the poll and clear
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* this file descriptor from the fdset if
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* the requested event wasn't ready.
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*/
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/*
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* First check for invalid descriptor.
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* If found, set errno and return -1.
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*/
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if (data.fds[i].revents & POLLNVAL) {
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errno = EBADF;
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return -1;
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}
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got_events = 0;
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if (readfds != NULL) {
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if (FD_ISSET(data.fds[i].fd, readfds)) {
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if ((data.fds[i].revents & (POLLIN
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| POLLRDNORM | POLLERR
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| POLLHUP | POLLNVAL)) != 0)
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got_events++;
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else
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FD_CLR(data.fds[i].fd, readfds);
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}
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}
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if (writefds != NULL) {
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if (FD_ISSET(data.fds[i].fd, writefds)) {
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if ((data.fds[i].revents & (POLLOUT
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| POLLWRNORM | POLLWRBAND | POLLERR
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| POLLHUP | POLLNVAL)) != 0)
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got_events++;
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else
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FD_CLR(data.fds[i].fd,
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writefds);
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}
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}
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if (exceptfds != NULL) {
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if (FD_ISSET(data.fds[i].fd, exceptfds)) {
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if (data.fds[i].revents & (POLLRDBAND |
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POLLPRI))
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got_events++;
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else
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FD_CLR(data.fds[i].fd,
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exceptfds);
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}
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}
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if (got_events != 0)
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numfds+=got_events;
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}
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ret = numfds;
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}
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return (ret);
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}
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int
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__select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
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struct timeval *timeout)
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{
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int ret;
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_thread_enter_cancellation_point();
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ret = _select(numfds, readfds, writefds, exceptfds, timeout);
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_thread_leave_cancellation_point();
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return ret;
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}
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