1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1989, 1991, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef _SYS__SIGALTSTACK_H_
38#define	_SYS__SIGALTSTACK_H_
39
40#include <sys/_types.h>
41
42#if __XSI_VISIBLE
43#if __BSD_VISIBLE
44#define	__stack_t sigaltstack
45#endif
46typedef	struct __stack_t stack_t;
47
48#define	SS_ONSTACK	0x0001	/* take signal on alternate stack */
49#define	SS_DISABLE	0x0004	/* disable taking signals on alternate stack */
50#define	MINSIGSTKSZ	__MINSIGSTKSZ		/* minimum stack size */
51#define	SIGSTKSZ	(MINSIGSTKSZ + 32768)	/* recommended stack size */
52#endif
53
54/*
55 * Structure used in sigaltstack call.  Its definition is always
56 * needed for __ucontext.  If __BSD_VISIBLE is defined, the structure
57 * tag is actually sigaltstack.
58 */
59struct __stack_t {
60	void	*ss_sp;			/* signal stack base */
61	__size_t ss_size;		/* signal stack length */
62	int	ss_flags;		/* SS_DISABLE and/or SS_ONSTACK */
63};
64
65#endif /* !_SYS__SIGALTSTACK_H_ */
66