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_ */