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+/* $OpenBSD: signal.h,v 1.29 2018/04/18 16:05:20 deraadt Exp $ */
+/* $NetBSD: signal.h,v 1.21 1996/02/09 18:25:32 christos Exp $ */
+
+/*
+ * Copyright (c) 1982, 1986, 1989, 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)signal.h 8.2 (Berkeley) 1/21/94
+ */
+
+#ifndef _SYS_SIGNAL_H_
+#define _SYS_SIGNAL_H_
+
+#include <machine/signal.h> /* sigcontext; codes for SIGILL, SIGFPE */
+
+#define _NSIG 33 /* counting 0 (mask is 1-32) */
+
+#if __BSD_VISIBLE
+#define NSIG _NSIG
+#endif
+
+#define SIGHUP 1 /* hangup */
+#define SIGINT 2 /* interrupt */
+#define SIGQUIT 3 /* quit */
+#define SIGILL 4 /* illegal instruction (not reset when caught) */
+#define SIGTRAP 5 /* trace trap (not reset when caught) */
+#define SIGABRT 6 /* abort() */
+#if __BSD_VISIBLE
+#define SIGIOT SIGABRT /* compatibility */
+#define SIGEMT 7 /* EMT instruction */
+#endif
+#define SIGFPE 8 /* floating point exception */
+#define SIGKILL 9 /* kill (cannot be caught or ignored) */
+#define SIGBUS 10 /* bus error */
+#define SIGSEGV 11 /* segmentation violation */
+#define SIGSYS 12 /* bad argument to system call */
+#define SIGPIPE 13 /* write on a pipe with no one to read it */
+#define SIGALRM 14 /* alarm clock */
+#define SIGTERM 15 /* software termination signal from kill */
+#define SIGURG 16 /* urgent condition on IO channel */
+#define SIGSTOP 17 /* sendable stop signal not from tty */
+#define SIGTSTP 18 /* stop signal from tty */
+#define SIGCONT 19 /* continue a stopped process */
+#define SIGCHLD 20 /* to parent on child stop or exit */
+#define SIGTTIN 21 /* to readers pgrp upon background tty read */
+#define SIGTTOU 22 /* like TTIN for output if (tp->t_local&LTOSTOP) */
+#if __BSD_VISIBLE
+#define SIGIO 23 /* input/output possible signal */
+#endif
+#define SIGXCPU 24 /* exceeded CPU time limit */
+#define SIGXFSZ 25 /* exceeded file size limit */
+#define SIGVTALRM 26 /* virtual time alarm */
+#define SIGPROF 27 /* profiling time alarm */
+#if __BSD_VISIBLE
+#define SIGWINCH 28 /* window size changes */
+#define SIGINFO 29 /* information request */
+#endif
+#define SIGUSR1 30 /* user defined signal 1 */
+#define SIGUSR2 31 /* user defined signal 2 */
+#if __BSD_VISIBLE
+#define SIGTHR 32 /* thread library AST */
+#endif
+
+/*
+ * Language spec says we must list exactly one parameter, even though we
+ * actually supply three. Ugh!
+ */
+#define SIG_DFL (void (*)(int))0
+#define SIG_IGN (void (*)(int))1
+#define SIG_ERR (void (*)(int))-1
+
+#if __POSIX_VISIBLE || __XPG_VISIBLE
+#ifndef _SIGSET_T_DEFINED_
+#define _SIGSET_T_DEFINED_
+typedef unsigned int sigset_t;
+#endif
+
+#include <sys/siginfo.h>
+
+/*
+ * Signal vector "template" used in sigaction call.
+ */
+struct sigaction {
+ union { /* signal handler */
+ void (*__sa_handler)(int);
+ void (*__sa_sigaction)(int, siginfo_t *, void *);
+ } __sigaction_u;
+ sigset_t sa_mask; /* signal mask to apply */
+ int sa_flags; /* see signal options below */
+};
+
+/* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
+#define sa_handler __sigaction_u.__sa_handler
+#define sa_sigaction __sigaction_u.__sa_sigaction
+
+#if __XPG_VISIBLE >= 500
+#define SA_ONSTACK 0x0001 /* take signal on signal stack */
+#define SA_RESTART 0x0002 /* restart system on signal return */
+#define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
+#define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
+#define SA_NOCLDWAIT 0x0020 /* don't create zombies (assign to pid 1) */
+#endif /* __XPG_VISIBLE >= 500 */
+#define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
+#if __POSIX_VISIBLE >= 199309 || __XPG_VISIBLE >= 500
+#define SA_SIGINFO 0x0040 /* generate siginfo_t */
+#endif
+
+/*
+ * Flags for sigprocmask:
+ */
+#define SIG_BLOCK 1 /* block specified signal set */
+#define SIG_UNBLOCK 2 /* unblock specified signal set */
+#define SIG_SETMASK 3 /* set specified signal set */
+#endif /* __POSIX_VISIBLE || __XPG_VISIBLE */
+
+#if __BSD_VISIBLE
+typedef void (*sig_t)(int); /* type of signal function */
+
+/*
+ * 4.3 compatibility:
+ * Signal vector "template" used in sigvec call.
+ */
+struct sigvec {
+ void (*sv_handler)(int); /* signal handler */
+ int sv_mask; /* signal mask to apply */
+ int sv_flags; /* see signal options below */
+};
+#define SV_ONSTACK SA_ONSTACK
+#define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
+#define SV_RESETHAND SA_RESETHAND
+#define sv_onstack sv_flags /* isn't compatibility wonderful! */
+
+/*
+ * Macro for converting signal number to a mask suitable for
+ * sigblock().
+ */
+#define sigmask(m) (1U << ((m)-1))
+
+#define BADSIG SIG_ERR
+
+#endif /* __BSD_VISIBLE */
+
+#if __BSD_VISIBLE || __XPG_VISIBLE >= 420
+/*
+ * Structure used in sigaltstack call.
+ */
+typedef struct sigaltstack {
+ void *ss_sp; /* signal stack base */
+ size_t ss_size; /* signal stack length */
+ int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
+} stack_t;
+#define SS_ONSTACK 0x0001 /* take signals on alternate stack */
+#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
+#define MINSIGSTKSZ (3U << _MAX_PAGE_SHIFT) /* minimum allowable stack */
+#if _MAX_PAGE_SHIFT < 14 /* recommended stack size */
+#define SIGSTKSZ (MINSIGSTKSZ + (1U << _MAX_PAGE_SHIFT) * 4)
+#else
+#define SIGSTKSZ (MINSIGSTKSZ + (1U << _MAX_PAGE_SHIFT) * 2)
+#endif
+
+typedef struct sigcontext ucontext_t;
+#endif /* __BSD_VISIBLE || __XPG_VISIBLE >= 420 */
+
+#ifndef _KERNEL
+/*
+ * For historical reasons; programs expect signal's return value to be
+ * defined by <sys/signal.h>.
+ */
+__BEGIN_DECLS
+void (*signal(int, void (*)(int)))(int);
+__END_DECLS
+#endif /* !_KERNEL */
+#endif /* !_SYS_SIGNAL_H_ */