lib/libc/sys/sigwait.c

   1 /* $NetBSD: sigwait.c,v 1.5 2012/03/20 16:26:12 matt Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jaromir Dolecek.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 __RCSID("$NetBSD: sigwait.c,v 1.5 2012/03/20 16:26:12 matt Exp $");
  35 #endif /* LIBC_SCCS and not lint */
  36
  37 #include "namespace.h"
  38 #include <sys/types.h>
  39 #include <sys/syscall.h>
  40 #include <unistd.h>
  41 #include <signal.h>
  42 #include <errno.h>
  43
  44 #ifdef __weak_alias
  45 __weak_alias(sigwait,_sigwait)
  46 #endif
  47
  48 int     _sigwait(const sigset_t * __restrict, int * __restrict);
  49
  50 /*
  51  * This is wrapper around sigtimedwait(2), providing sigwait()
  52  * implementation for userland.
  53  */
  54 int
  55 _sigwait(const sigset_t * __restrict set, int * __restrict signum)
  56 {
  57         int saved_errno, new_errno, sig;
  58
  59         saved_errno = errno;
  60         sig = __sigtimedwait(set, NULL, NULL);
  61         new_errno = errno;
  62         errno = saved_errno;
  63         if (sig < 0)
  64                 return (new_errno);
  65         *signum = sig;
  66         return (0);
  67 }