thr_select.c revision 117197
1/* 2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by John Birrell. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD: head/lib/libkse/thread/thr_select.c 117197 2003-07-03 13:36:29Z davidxu $ 33 */ 34#include <unistd.h> 35#include <errno.h> 36#include <poll.h> 37#include <stdlib.h> 38#include <string.h> 39#include <sys/param.h> 40#include <sys/types.h> 41#include <sys/time.h> 42#include <sys/fcntl.h> 43#include <pthread.h> 44#include "thr_private.h" 45 46__weak_reference(__select, select); 47 48int 49__select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, 50 struct timeval *timeout) 51{ 52 struct pthread *curthread = _get_curthread(); 53 struct timespec ts; 54 int ret; 55 56 if (numfds == 0 && timeout != NULL) { 57 TIMEVAL_TO_TIMESPEC(timeout, &ts); 58 return nanosleep(&ts, NULL); 59 } else { 60 _thr_enter_cancellation_point(curthread); 61 ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout); 62 _thr_leave_cancellation_point(curthread); 63 } 64 return ret; 65} 66