1/* 2 * Copyright 2000 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#if (defined(VARIANT_CANCELABLE) || defined(VARIANT_PRE1050)) && __DARWIN_NON_CANCELABLE != 0 31#error cancellable call vs. __DARWIN_NON_CANCELABLE mismatch 32#endif 33 34#ifdef VARIANT_DARWINEXTSN 35#define _DARWIN_UNLIMITED_SELECT 36#endif /* VARIANT_DARWINEXTSN */ 37 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD: src/lib/libc/gen/pselect.c,v 1.6 2002/10/12 16:13:37 mike Exp $"); 40 41#include "namespace.h" 42#include <sys/types.h> 43#include <sys/select.h> 44#include <sys/time.h> 45#include <unistd.h> 46 47#include <errno.h> 48#include <signal.h> 49#include "un-namespace.h" 50 51__weak_reference(__pselect, pselect); 52 53// Returns -1 and sets errno in contrast to pthread_sigmask which returns errno 54extern int __pthread_sigmask(int, const sigset_t *, sigset_t *); 55 56/* 57 * Emulate the POSIX 1003.1g-2000 `pselect' interface. This is the 58 * same as the traditional BSD `select' function, except that it uses 59 * a timespec rather than a timeval, doesn't modify the timeout argument, 60 * and allows the user to specify a signal mask to apply during the select. 61 */ 62int 63__pselect(int count, fd_set * __restrict rfds, fd_set * __restrict wfds, 64 fd_set * __restrict efds, const struct timespec * __restrict timo, 65 const sigset_t * __restrict mask) 66{ 67 sigset_t omask; 68 struct timeval tvtimo, *tvp; 69 int rv, sverrno; 70 71 if (timo) { 72 TIMESPEC_TO_TIMEVAL(&tvtimo, timo); 73 tvp = &tvtimo; 74 } else 75 tvp = 0; 76 77 if (mask != 0) { 78 rv = __pthread_sigmask(SIG_SETMASK, mask, &omask); 79 if (rv != 0) 80 return rv; 81 } 82 83 rv = _select(count, rfds, wfds, efds, tvp); 84 if (mask != 0) { 85 sverrno = errno; 86 __pthread_sigmask(SIG_SETMASK, &omask, (sigset_t *)0); 87 errno = sverrno; 88 } 89 90 return rv; 91} 92