xnu-4903.241.1.tar.gz

[apple/xnu.git] / bsd / sys / signal.h

/*
 * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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 <sys/cdefs.h>
#include <sys/appleapiopts.h>
#include <Availability.h>

#define __DARWIN_NSIG	32	/* counting 0; could be 33 (mask is 1-32) */

#if !defined(_ANSI_SOURCE) && (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE))
#define NSIG	__DARWIN_NSIG
#endif

#include <machine/signal.h>	/* sigcontext; codes for SIGILL, SIGFPE */

#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  (defined(_POSIX_C_SOURCE) && !defined(_DARWIN_C_SOURCE))
#define	SIGPOLL	7	/* pollable event ([XSR] generated, not supported) */
#else	/* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
#define	SIGIOT	SIGABRT	/* compatibility */
#define	SIGEMT	7	/* EMT instruction */
#endif	/* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
#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  (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE))
#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  (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE))
#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 defined(_ANSI_SOURCE) || __DARWIN_UNIX03 || defined(__cplusplus)
/*
 * Language spec sez we must list exactly one parameter, even though we
 * actually supply three.  Ugh!
 * SIG_HOLD is chosen to avoid KERN_SIG_* values in <sys/signalvar.h>
 */
#define	SIG_DFL		(void (*)(int))0
#define	SIG_IGN		(void (*)(int))1
#define	SIG_HOLD	(void (*)(int))5
#define	SIG_ERR		((void (*)(int))-1)
#else
/* DO NOT REMOVE THE COMMENTED OUT int: fixincludes needs to see them */
#define	SIG_DFL		(void (*)(/*int*/))0
#define	SIG_IGN		(void (*)(/*int*/))1
#define	SIG_HOLD	(void (*)(/*int*/))5
#define	SIG_ERR		((void (*)(/*int*/))-1)
#endif

#ifndef _ANSI_SOURCE
#include <sys/_types.h>

#include <machine/_mcontext.h>

#ifndef KERNEL
#include <sys/_pthread/_pthread_attr_t.h>
#endif /* KERNEL */

#include <sys/_types/_sigaltstack.h>
#include <sys/_types/_ucontext.h>

#include <sys/_types/_pid_t.h>
#include <sys/_types/_sigset_t.h>
#include <sys/_types/_size_t.h>
#include <sys/_types/_uid_t.h>

union sigval {
	/* Members as suggested by Annex C of POSIX 1003.1b. */
	int	sival_int;
	void	*sival_ptr;
};

#define	SIGEV_NONE	0	/* No async notification */
#define	SIGEV_SIGNAL	1	/* aio - completion notification */
#define	SIGEV_THREAD	3	/* [NOTIMP] [RTS] call notification function */

#ifndef KERNEL
struct sigevent {
	int				sigev_notify;				/* Notification type */
	int				sigev_signo;				/* Signal number */
	union sigval	sigev_value;				/* Signal value */
	void			(*sigev_notify_function)(union sigval);	  /* Notification function */
	pthread_attr_t	*sigev_notify_attributes;	/* Notification attributes */
};
#endif /* KERNEL */

#ifdef BSD_KERNEL_PRIVATE

union user64_sigval {
	struct {
		uint32_t		pad;	/* assumes Motorola byte order */
		int32_t			sival_int;
	} size_equivalent;
	user64_addr_t	sival_ptr;
};

union user32_sigval {
	/* Members as suggested by Annex C of POSIX 1003.1b. */
	int32_t	sival_int;
	user32_addr_t sival_ptr;
};

union user_sigval {
	struct {
		uint32_t		pad;	/* assumes Motorola byte order */
		int32_t			sival_int;
	} size_equivalent;
	user_addr_t sival_ptr;
};

struct user64_sigevent {
	int		sigev_notify;			/* Notification type */
	int		sigev_signo;			/* Signal number */
	union user64_sigval sigev_value;			/* Signal value */
	user64_addr_t	sigev_notify_function;	  	/* Notify function */
	user64_addr_t 	sigev_notify_attributes;	/* Notify attributes */
};

struct user32_sigevent {
	int		sigev_notify;			/* Notification type */
	int		sigev_signo;			/* Signal number */
	union user32_sigval sigev_value;			/* Signal value */
	user32_addr_t	sigev_notify_function;	  	/* Notify function */
	user32_addr_t 	sigev_notify_attributes;	/* Notify attributes */
};

struct user_sigevent {
	int		sigev_notify;			/* Notification type */
	int		sigev_signo;			/* Signal number */
	union user_sigval sigev_value;			/* Signal value */
	user_addr_t	sigev_notify_function;	  	/* Notify function */
	user_addr_t 	sigev_notify_attributes;	/* Notify attributes */
};

#endif	/* BSD_KERNEL_PRIVATE */

typedef struct __siginfo {
	int	si_signo;		/* signal number */
	int	si_errno;		/* errno association */
	int	si_code;		/* signal code */
	pid_t	si_pid;			/* sending process */
	uid_t	si_uid;			/* sender's ruid */
	int	si_status;		/* exit value */
	void	*si_addr;		/* faulting instruction */
	union sigval si_value;		/* signal value */
	long	si_band;		/* band event for SIGPOLL */
	unsigned long	__pad[7];	/* Reserved for Future Use */
} siginfo_t;

#ifdef BSD_KERNEL_PRIVATE

typedef struct user_siginfo {
	int		si_signo;	/* signal number */
	int		si_errno;	/* errno association */
	int		si_code;	/* signal code */
	pid_t		si_pid;		/* sending process */
	uid_t		si_uid;		/* sender's ruid */
	int		si_status;	/* exit value */
	user_addr_t	si_addr;	/* faulting instruction (see below) */
	union user_sigval si_value;	/* signal value */
	user_long_t	si_band;	/* band event for SIGPOLL */
	user_ulong_t	pad[7];		/* Reserved for Future Use */
} user_siginfo_t;

typedef struct user64_siginfo {
	int		si_signo;	/* signal number */
	int		si_errno;	/* errno association */
	int		si_code;	/* signal code */
	pid_t		si_pid;		/* sending process */
	uid_t		si_uid;		/* sender's ruid */
	int		si_status;	/* exit value */
	user64_addr_t	si_addr;	/* faulting instruction (see below) */
	union user64_sigval si_value;	/* signal value */
	user64_long_t	si_band;	/* band event for SIGPOLL */
	user64_ulong_t	__pad[7];		/* Reserved for Future Use */
} user64_siginfo_t;

typedef struct user32_siginfo {
	int		si_signo;	/* signal number */
	int		si_errno;	/* errno association */
	int		si_code;	/* signal code */
	pid_t		si_pid;		/* sending process */
	uid_t		si_uid;		/* sender's ruid */
	int		si_status;	/* exit value */
	user32_addr_t	si_addr;	/* faulting instruction (see below) */
	union user32_sigval	si_value;	/* signal value */
	user32_long_t	si_band;	/* band event for SIGPOLL */
	user32_ulong_t	__pad[7];		/* Reserved for Future Use */
} user32_siginfo_t;

void siginfo_user_to_user32(user_siginfo_t *, user32_siginfo_t *);
void siginfo_user_to_user64(user_siginfo_t *, user64_siginfo_t *);

#endif	/* BSD_KERNEL_PRIVATE */

/* 
 * When the signal is SIGILL or SIGFPE, si_addr contains the address of 
 * the faulting instruction.
 * When the signal is SIGSEGV or SIGBUS, si_addr contains the address of 
 * the faulting memory reference. Although for x86 there are cases of SIGSEGV
 * for which si_addr cannot be determined and is NULL. 
 * If the signal is SIGCHLD, the si_pid field will contain the child process ID,
 *  si_status contains the exit value or signal and
 *  si_uid contains the real user ID of the process that sent the signal.
 */

/* Values for si_code */

/* Codes for SIGILL */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define	ILL_NOOP	0	/* if only I knew... */
#endif
#define	ILL_ILLOPC	1	/* [XSI] illegal opcode */
#define	ILL_ILLTRP	2	/* [XSI] illegal trap */
#define	ILL_PRVOPC	3	/* [XSI] privileged opcode */
#define	ILL_ILLOPN	4	/* [XSI] illegal operand -NOTIMP */
#define	ILL_ILLADR	5	/* [XSI] illegal addressing mode -NOTIMP */
#define	ILL_PRVREG	6	/* [XSI] privileged register -NOTIMP */
#define	ILL_COPROC	7	/* [XSI] coprocessor error -NOTIMP */
#define	ILL_BADSTK	8	/* [XSI] internal stack error -NOTIMP */

/* Codes for SIGFPE */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define	FPE_NOOP	0	/* if only I knew... */
#endif
#define FPE_FLTDIV	1	/* [XSI] floating point divide by zero */
#define FPE_FLTOVF	2	/* [XSI] floating point overflow */
#define FPE_FLTUND	3	/* [XSI] floating point underflow */
#define FPE_FLTRES	4	/* [XSI] floating point inexact result */
#define FPE_FLTINV	5	/* [XSI] invalid floating point operation */
#define	FPE_FLTSUB	6	/* [XSI] subscript out of range -NOTIMP */
#define	FPE_INTDIV	7	/* [XSI] integer divide by zero */
#define	FPE_INTOVF	8	/* [XSI] integer overflow */

/* Codes for SIGSEGV */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define	SEGV_NOOP	0	/* if only I knew... */
#endif
#define	SEGV_MAPERR	1	/* [XSI] address not mapped to object */
#define	SEGV_ACCERR	2	/* [XSI] invalid permission for mapped object */

/* Codes for SIGBUS */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define	BUS_NOOP	0	/* if only I knew... */
#endif
#define	BUS_ADRALN	1	/* [XSI] Invalid address alignment */
#define	BUS_ADRERR	2	/* [XSI] Nonexistent physical address -NOTIMP */
#define	BUS_OBJERR	3	/* [XSI] Object-specific HW error - NOTIMP */

/* Codes for SIGTRAP */
#define	TRAP_BRKPT	1	/* [XSI] Process breakpoint -NOTIMP */
#define	TRAP_TRACE	2	/* [XSI] Process trace trap -NOTIMP */

/* Codes for SIGCHLD */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define	CLD_NOOP	0	/* if only I knew... */
#endif
#define	CLD_EXITED	1	/* [XSI] child has exited */
#define	CLD_KILLED	2	/* [XSI] terminated abnormally, no core file */
#define	CLD_DUMPED	3	/* [XSI] terminated abnormally, core file */
#define	CLD_TRAPPED	4	/* [XSI] traced child has trapped */
#define	CLD_STOPPED	5	/* [XSI] child has stopped */
#define	CLD_CONTINUED	6	/* [XSI] stopped child has continued */

/* Codes for SIGPOLL */
#define	POLL_IN		1	/* [XSR] Data input available */
#define	POLL_OUT	2	/* [XSR] Output buffers available */
#define	POLL_MSG	3	/* [XSR] Input message available */
#define	POLL_ERR	4	/* [XSR] I/O error */
#define	POLL_PRI	5	/* [XSR] High priority input available */
#define	POLL_HUP	6	/* [XSR] Device disconnected */

/* union for signal handlers */
union __sigaction_u {
	void    (*__sa_handler)(int);
	void    (*__sa_sigaction)(int, struct __siginfo *,
		       void *);
};

/* Signal vector template for Kernel user boundary */
struct	__sigaction {
	union __sigaction_u __sigaction_u;  /* signal handler */
	void    (*sa_tramp)(void *, int, int, siginfo_t *, void *);
	sigset_t sa_mask;		/* signal mask to apply */
	int	sa_flags;		/* see signal options below */
};

/*
 * Signal vector "template" used in sigaction call.
 */
struct	sigaction {
	union __sigaction_u __sigaction_u;  /* signal handler */
	sigset_t sa_mask;		/* signal mask to apply */
	int	sa_flags;		/* see signal options below */
};

#ifdef	BSD_KERNEL_PRIVATE
#include <machine/types.h>

union __user32_sigaction_u {
	user32_addr_t __sa_handler;
	user32_addr_t __sa_sigaction;
};

struct	user32_sigaction {
	union __user32_sigaction_u __sigaction_u;  /* signal handler */
	sigset_t sa_mask;		/* signal mask to apply */
	int	sa_flags;		/* see signal options below */
};

struct	__user32_sigaction {
	union __user32_sigaction_u __sigaction_u;  /* signal handler */
	user32_addr_t sa_tramp;
	sigset_t sa_mask;		/* signal mask to apply */
	int	sa_flags;		/* see signal options below */
};

union __user64_sigaction_u {
	user64_addr_t	__sa_handler;
	user64_addr_t	__sa_sigaction;
};

struct	user64_sigaction {
	union __user64_sigaction_u __sigaction_u;  /* signal handler */
	sigset_t sa_mask;		/* signal mask to apply */
	int	sa_flags;		/* see signal options below */
};

struct	__user64_sigaction {
	union __user64_sigaction_u __sigaction_u;  /* signal handler */
	user64_addr_t	sa_tramp;	/* signal mask to apply */
	sigset_t sa_mask;		/* signal mask to apply */
	int	sa_flags;		/* see signal options below */
};

union __kern_sigaction_u {
	user_addr_t	__sa_handler;
	user_addr_t	__sa_sigaction;
};

struct	kern_sigaction {
	union __kern_sigaction_u __sigaction_u;  /* signal handler */
	sigset_t sa_mask;		/* signal mask to apply */
	int	sa_flags;		/* see signal options below */
};

struct	__kern_sigaction {
	union __kern_sigaction_u __sigaction_u;  /* signal handler */
	user_addr_t	sa_tramp;	/* signal mask to apply */
	sigset_t sa_mask;		/* signal mask to apply */
	int	sa_flags;		/* see signal options below */
};

#undef SIG_DFL
#undef SIG_IGN
#undef SIG_ERR
#define  SIG_DFL	((user_addr_t)0LL)
#define  SIG_IGN	((user_addr_t)1LL)
#define  SIG_ERR	((user_addr_t)-1LL)

#endif	/* BSD_KERNEL_PRIVATE */


/* 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

#define SA_ONSTACK	0x0001	/* take signal on signal stack */
#define SA_RESTART	0x0002	/* restart system on signal return */
#ifdef	BSD_KERNEL_PRIVATE
#define	SA_DISABLE	0x0004	/* disable taking signals on alternate stack - for user_sigaltstack.ss_flags only */
#endif	/* BSD_KERNEL_PRIVATE */
#define	SA_RESETHAND	0x0004	/* reset to SIG_DFL when taking signal */
#define SA_NOCLDSTOP	0x0008	/* do not generate SIGCHLD on child stop */
#define	SA_NODEFER	0x0010	/* don't mask the signal we're delivering */
#define	SA_NOCLDWAIT	0x0020	/* don't keep zombies around */
#define	SA_SIGINFO	0x0040	/* signal handler with SA_SIGINFO args */
#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
#define	SA_USERTRAMP	0x0100	/* do not bounce off kernel's sigtramp */
/* This will provide 64bit register set in a 32bit user address space */
#define	SA_64REGSET	0x0200	/* signal handler with SA_SIGINFO args with 64bit regs information */
#endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
#ifdef	BSD_KERNEL_PRIVATE
#define	SA_VALIDATE_SIGRETURN_FROM_SIGTRAMP	0x0400	/* use token to validate sigreturn was called from matching sigtramp */
#endif	/* BSD_KERNEL_PRIVATE */

/* the following are the only bits we support from user space, the 
 * rest are for kernel use only.
 */
#define SA_USERSPACE_MASK (SA_ONSTACK | SA_RESTART | SA_RESETHAND | SA_NOCLDSTOP | SA_NODEFER | SA_NOCLDWAIT | SA_SIGINFO)

/*
 * 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 */

/* POSIX 1003.1b required values. */
#define SI_USER		0x10001	/* [CX] signal from kill() */
#define SI_QUEUE	0x10002	/* [CX] signal from sigqueue() */
#define SI_TIMER	0x10003	/* [CX] timer expiration */
#define SI_ASYNCIO	0x10004	/* [CX] aio request completion */
#define SI_MESGQ	0x10005	/* [CX]	from message arrival on empty queue */

#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
typedef	void (*sig_t)(int);	/* type of signal function */
#endif

/*
 * Structure used in sigaltstack call.
 */
#ifdef	BSD_KERNEL_PRIVATE

struct  user32_sigaltstack {
	user32_addr_t	ss_sp;		/* signal stack base */
	user32_size_t	ss_size;	/* signal stack length */
	int	 	    ss_flags;	/* SA_DISABLE and/or SA_ONSTACK */
};

struct  user64_sigaltstack {
	user64_addr_t	ss_sp;		/* signal stack base */
	user64_size_t	ss_size;	/* signal stack length */
	int		ss_flags;	/* SA_DISABLE and/or SA_ONSTACK */
};

struct  kern_sigaltstack {
	user_addr_t	ss_sp;		/* signal stack base */
	user_size_t	ss_size;	/* signal stack length */
	int		ss_flags;	/* SA_DISABLE and/or SA_ONSTACK */
};

#endif	/* BSD_KERNEL_PRIVATE */

#define SS_ONSTACK	0x0001	/* take signal on signal stack */
#define	SS_DISABLE	0x0004	/* disable taking signals on alternate stack */
#define	MINSIGSTKSZ	32768	/* (32K)minimum allowable stack */
#define	SIGSTKSZ	131072	/* (128K)recommended stack size */

#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
/*
 * 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_NODEFER	SA_NODEFER
#define SV_NOCLDSTOP	SA_NOCLDSTOP
#define SV_SIGINFO	SA_SIGINFO

#define sv_onstack sv_flags	/* isn't compatibility wonderful! */
#endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */

/*
 * Structure used in sigstack call.
 */
struct	sigstack {
	char	*ss_sp;			/* signal stack pointer */
	int	ss_onstack;		/* current status */
};

#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
/*
 * Macro for converting signal number to a mask suitable for
 * sigblock().
 */
#define sigmask(m)	(1 << ((m)-1))

#ifdef	KERNEL_PRIVATE
/*
 *	signals delivered on a per-thread basis.
 */
#define threadmask (sigmask(SIGILL)|sigmask(SIGTRAP)|\
		    sigmask(SIGABRT)|sigmask(SIGEMT)|\
		    sigmask(SIGFPE)|sigmask(SIGBUS)|\
		    sigmask(SIGSEGV)|sigmask(SIGSYS)|\
		    sigmask(SIGPIPE)|sigmask(SIGKILL))

#define workq_threadmask ((threadmask | sigcantmask | sigmask(SIGPROF)) & ~sigmask(SIGABRT))

/*
 * Signals carried across exec.
 */
#define execmask   (sigmask(SIGHUP)|sigmask(SIGINT)|\
		    sigmask(SIGQUIT)|sigmask(SIGKILL)|\
		    sigmask(SIGTERM)|sigmask(SIGSTOP)|\
		    sigmask(SIGTSTP)|sigmask(SIGCONT)|\
		    sigmask(SIGTTIN)|sigmask(SIGTTOU)|\
		    sigmask(SIGUSR1)|sigmask(SIGUSR2))

#endif	/* KERNEL_PRIVATE */

#define	BADSIG		SIG_ERR

#endif	/* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
#endif	/* !_ANSI_SOURCE */

/*
 * 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	/* !_SYS_SIGNAL_H_ */