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 46 typedef 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 */ 59 struct __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