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      1 /*	$NetBSD: compat_sigaltstack.c,v 1.5 2012/03/20 17:06:00 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Klaus Klein.
      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: compat_sigaltstack.c,v 1.5 2012/03/20 17:06:00 matt Exp $");
     35 #endif /* LIBC_SCCS and not lint */
     36 
     37 #define __LIBC12_SOURCE__
     38 
     39 #include <limits.h>
     40 #include <sys/time.h>
     41 #include <compat/sys/time.h>
     42 #include <signal.h>
     43 #include <compat/include/signal.h>
     44 #include <stddef.h>
     45 
     46 int
     47 sigaltstack(const struct sigaltstack13 *onss, struct sigaltstack13 *ooss)
     48 {
     49 	stack_t nss, oss;
     50 	int error;
     51 
     52 	nss.ss_sp = onss->ss_sp;
     53 	nss.ss_size = onss->ss_size;
     54 	nss.ss_flags = onss->ss_flags;
     55 
     56 	error = __sigaltstack14(&nss, &oss);
     57 
     58 	if (error == 0 && ooss != NULL) {
     59 		ooss->ss_sp = oss.ss_sp;
     60 		if (oss.ss_size > INT_MAX)
     61 			ooss->ss_size = INT_MAX;
     62 		else
     63 			ooss->ss_size = (int)oss.ss_size;
     64 		ooss->ss_flags = oss.ss_flags;
     65 	}
     66 
     67 	return (error);
     68 }
     69