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