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

/*
 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_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/appleapiopts.h>

#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
#define NSIG	32		/* counting 0; could be 33 (mask is 1-32) */
#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) */
#if  !defined(_POSIX_SOURCE)
#define	SIGTRAP	5	/* trace trap (not reset when caught) */
#endif
#define	SIGABRT	6	/* abort() */
#if  !defined(_POSIX_SOURCE)
#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) */
#if  !defined(_POSIX_SOURCE)
#define	SIGBUS	10	/* bus error */
#endif
#define	SIGSEGV	11	/* segmentation violation */
#if  !defined(_POSIX_SOURCE)
#define	SIGSYS	12	/* bad argument to system call */
#endif
#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 */
#if  !defined(_POSIX_SOURCE)
#define	SIGURG	16	/* urgent condition on IO channel */
#endif
#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_SOURCE)
#define	SIGIO	23	/* input/output possible signal */
#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 */
#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) || defined(__cplusplus)
/*
 * Language spec sez 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
#else
#define	SIG_DFL		(void (*)())0
#define	SIG_IGN		(void (*)())1
#define	SIG_ERR		(void (*)())-1
#endif

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

typedef unsigned int sigset_t;

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

#define	SIGEV_NONE		0		/* No async notification */
#define	SIGEV_SIGNAL	1		/* aio - completion notification */
#ifdef __APPLE_API_PRIVATE
#define SIGEV_THREAD	3		/* A notification function will be called to perform notification */
#endif /*__APPLE_API_PRIVATE */

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 */
};

typedef struct __siginfo {
	int	si_signo;		/* signal number */
	int	si_errno;		/* errno association */
	int	si_code;		/* signal code */
	int	si_pid;			/* sending process */
	unsigned int 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 int	pad[7];		/* Reserved for Future Use */
} siginfo_t;

/* 
 * Incase of SIGILL and SIGFPE, si_addr contains the address of 
 *  faulting instruction.
 * Incase of SIGSEGV and SIGBUS, si_addr contains address of 
 *  faulting memory reference.
 * Incase of SIGCHLD, si_pid willhave child process ID,
 *  si_status will contain exit value or signal.
 *  si_uid contains real user ID of the process that sent the signal
 */

/* Values for si_code */

/* Codes for SIGILL */
#define	ILL_NOOP	0	/* if only I knew... */
#define	ILL_ILLOPC	1	/* illegal opcode */
#define	ILL_ILLTRP	2	/* illegal trap */
#define	ILL_PRVOPC	3	/* privileged opcode */

/* Codes for SIGFPE */
#define	FPE_NOOP	0	/* if only I knew... */
#define FPE_FLTDIV	1	/* floating point divide by zero */
#define FPE_FLTOVF	2	/* floating point overflow */
#define FPE_FLTUND	3	/* floating point underflow */
#define FPE_FLTRES	4	/* floating point inexact result */
#define FPE_FLTINV	5	/* invalid floating point operation */

/* Codes for SIGSEGV */
#define	SEGV_NOOP	0	/* if only I knew... */
#define	SEGV_MAPERR	1	/* address not mapped to object */
#define	SEGV_ACCERR	2	/* invalid permissions for mapped to object */

/* Codes for SIGBUS */
#define	BUS_NOOP	0	/* if only I knew... */
#define	BUS_ADRALN	1	/* invalid address alignment */

/* Codes for SIGCHLD */
#define	CLD_NOOP	0	/* if only I knew... */
#define	CLD_EXITED	1	/* child has exited */
#define	CLD_KILLED	2	
	/* child has terminated abnormally and did not create a core file */
#define	CLD_DUMPED	3	
	/* child has terminated abnormally and create a core file */
#define	CLD_TRAPPED	4	/* traced child has trapped */
#define	CLD_STOPPED	5	/* child has stopped */
#define	CLD_CONTINUED	6	/* stopped child has continued */

/* 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 */
};
/* 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  !defined(_POSIX_SOURCE)
#define SA_ONSTACK	0x0001	/* take signal on signal stack */
#define SA_RESTART	0x0002	/* restart system on signal return */
#define	SA_DISABLE	0x0004	/* disable taking signals on alternate stack */
#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 keep zombies around */
#define	SA_SIGINFO	0x0040	/* signal handler with SA_SIGINFO args */
#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
#define SA_NOCLDSTOP	0x0008	/* do not generate SIGCHLD on child stop */

/*
 * 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
#define SI_QUEUE	0x10002
#define SI_TIMER	0x10003
#define SI_ASYNCIO	0x10004
#define SI_MESGQ	0x10005

#if !defined(_POSIX_SOURCE)
#include <sys/cdefs.h>
typedef	void (*sig_t) __P((int));	/* type of signal function */

/*
 * Structure used in sigaltstack call.
 */
struct	sigaltstack {
	char	*ss_sp;		/* signal stack base */
	int	ss_size;		/* signal stack length */
	int	ss_flags;		/* SA_DISABLE and/or SA_ONSTACK */
};

typedef struct  sigaltstack stack_t;

#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 */

/*
 * 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! */

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

/*
 * Macro for converting signal number to a mask suitable for
 * sigblock().
 */
#define sigmask(m)	(1 << ((m)-1))

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

#define	BADSIG		SIG_ERR

#endif	/* !_POSIX_SOURCE */
#endif	/* !_ANSI_SOURCE */

/*
 * For historical reasons; programs expect signal's return value to be
 * defined by <sys/signal.h>.
 */
__BEGIN_DECLS
void	(*signal __P((int, void (*) __P((int))))) __P((int));
__END_DECLS
#endif	/* !_SYS_SIGNAL_H_ */
Commit	Line	Data
1c79356b	1	/*
9bccf70c	2	* Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
1c79356b A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
e5568f75 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
e5568f75 A	12	* This Original Code and all software distributed under the License are
e5568f75 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
e5568f75 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	23	/*
	24	* Copyright (c) 1982, 1986, 1989, 1991, 1993
	25	* The Regents of the University of California. All rights reserved.
	26	* (c) UNIX System Laboratories, Inc.
	27	* All or some portions of this file are derived from material licensed
	28	* to the University of California by American Telephone and Telegraph
	29	* Co. or Unix System Laboratories, Inc. and are reproduced herein with
	30	* the permission of UNIX System Laboratories, Inc.
	31	*
	32	* Redistribution and use in source and binary forms, with or without
	33	* modification, are permitted provided that the following conditions
	34	* are met:
	35	* 1. Redistributions of source code must retain the above copyright
	36	* notice, this list of conditions and the following disclaimer.
	37	* 2. Redistributions in binary form must reproduce the above copyright
	38	* notice, this list of conditions and the following disclaimer in the
	39	* documentation and/or other materials provided with the distribution.
	40	* 3. All advertising materials mentioning features or use of this software
	41	* must display the following acknowledgement:
	42	* This product includes software developed by the University of
	43	* California, Berkeley and its contributors.
	44	* 4. Neither the name of the University nor the names of its contributors
	45	* may be used to endorse or promote products derived from this software
	46	* without specific prior written permission.
	47	*
	48	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	49	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	50	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	51	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	52	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	53	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	54	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	55	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	56	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	57	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	58	* SUCH DAMAGE.
	59	*
	60	* @(#)signal.h 8.2 (Berkeley) 1/21/94
	61	*/
	62
	63	#ifndef _SYS_SIGNAL_H_
	64	#define _SYS_SIGNAL_H_
	65
9bccf70c A	66	#include <sys/appleapiopts.h>
9bccf70c A	67
1c79356b A	68	#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
	69	#define NSIG 32 /* counting 0; could be 33 (mask is 1-32) */
	70	#endif
	71
	72	#include <machine/signal.h> /* sigcontext; codes for SIGILL, SIGFPE */
	73
	74	#define SIGHUP 1 /* hangup */
	75	#define SIGINT 2 /* interrupt */
	76	#define SIGQUIT 3 /* quit */
	77	#define SIGILL 4 /* illegal instruction (not reset when caught) */
	78	#if !defined(_POSIX_SOURCE)
	79	#define SIGTRAP 5 /* trace trap (not reset when caught) */
	80	#endif
	81	#define SIGABRT 6 /* abort() */
	82	#if !defined(_POSIX_SOURCE)
	83	#define SIGIOT SIGABRT /* compatibility */
	84	#define SIGEMT 7 /* EMT instruction */
	85	#endif
	86	#define SIGFPE 8 /* floating point exception */
	87	#define SIGKILL 9 /* kill (cannot be caught or ignored) */
	88	#if !defined(_POSIX_SOURCE)
	89	#define SIGBUS 10 /* bus error */
	90	#endif
	91	#define SIGSEGV 11 /* segmentation violation */
	92	#if !defined(_POSIX_SOURCE)
	93	#define SIGSYS 12 /* bad argument to system call */
	94	#endif
	95	#define SIGPIPE 13 /* write on a pipe with no one to read it */
	96	#define SIGALRM 14 /* alarm clock */
	97	#define SIGTERM 15 /* software termination signal from kill */
	98	#if !defined(_POSIX_SOURCE)
	99	#define SIGURG 16 /* urgent condition on IO channel */
	100	#endif
	101	#define SIGSTOP 17 /* sendable stop signal not from tty */
	102	#define SIGTSTP 18 /* stop signal from tty */
	103	#define SIGCONT 19 /* continue a stopped process */
	104	#define SIGCHLD 20 /* to parent on child stop or exit */
	105	#define SIGTTIN 21 /* to readers pgrp upon background tty read */
	106	#define SIGTTOU 22 /* like TTIN for output if (tp->t_local&LTOSTOP) */
	107	#if !defined(_POSIX_SOURCE)
	108	#define SIGIO 23 /* input/output possible signal */
	109	#define SIGXCPU 24 /* exceeded CPU time limit */
	110	#define SIGXFSZ 25 /* exceeded file size limit */
	111	#define SIGVTALRM 26 /* virtual time alarm */
	112	#define SIGPROF 27 /* profiling time alarm */
	113	#define SIGWINCH 28 /* window size changes */
	114	#define SIGINFO 29 /* information request */
	115	#endif
	116	#define SIGUSR1 30 /* user defined signal 1 */
	117	#define SIGUSR2 31 /* user defined signal 2 */
	118
	119	#if defined(_ANSI_SOURCE) \|\| defined(__cplusplus)
	120	/*
	121	* Language spec sez we must list exactly one parameter, even though we
	122	* actually supply three. Ugh!
	123	*/
	124	#define SIG_DFL (void (*)(int))0
	125	#define SIG_IGN (void (*)(int))1
	126	#define SIG_ERR (void (*)(int))-1
	127	#else
	128	#define SIG_DFL (void (*)())0
	129	#define SIG_IGN (void (*)())1
	130	#define SIG_ERR (void (*)())-1
	131	#endif
132
133	#ifndef _ANSI_SOURCE
55e303ae A	134	#include <sys/types.h>
55e303ae A	135
1c79356b A	136	typedef unsigned int sigset_t;
1c79356b A	137
9bccf70c A	138	union sigval {
	139	/* Members as suggested by Annex C of POSIX 1003.1b. */
	140	int sigval_int;
	141	void *sigval_ptr;
	142	};
	143
55e303ae A	144	#define SIGEV_NONE 0 /* No async notification */
55e303ae A	145	#define SIGEV_SIGNAL 1 /* aio - completion notification */
9bccf70c	146	#ifdef __APPLE_API_PRIVATE
55e303ae	147	#define SIGEV_THREAD 3 /* A notification function will be called to perform notification */
9bccf70c A	148	#endif /__APPLE_API_PRIVATE /
9bccf70c A	149
55e303ae A	150	struct sigevent {
	151	int sigev_notify; /* Notification type */
	152	int sigev_signo; /* Signal number */
	153	union sigval sigev_value; /* Signal value */
	154	void (sigev_notify_function)(union sigval); / Notification function */
	155	pthread_attr_t sigev_notify_attributes; / Notification attributes */
	156	};
	157
9bccf70c A	158	typedef struct __siginfo {
	159	int si_signo; /* signal number */
	160	int si_errno; /* errno association */
	161	int si_code; /* signal code */
	162	int si_pid; /* sending process */
	163	unsigned int si_uid; /* sender's ruid */
	164	int si_status; /* exit value */
	165	void si_addr; / faulting instruction */
	166	union sigval si_value; /* signal value */
	167	long si_band; /* band event for SIGPOLL */
55e303ae	168	unsigned int pad[7]; /* Reserved for Future Use */
9bccf70c A	169	} siginfo_t;
	170
	171	/*
	172	* Incase of SIGILL and SIGFPE, si_addr contains the address of
	173	* faulting instruction.
	174	* Incase of SIGSEGV and SIGBUS, si_addr contains address of
	175	* faulting memory reference.
	176	* Incase of SIGCHLD, si_pid willhave child process ID,
	177	* si_status will contain exit value or signal.
	178	* si_uid contains real user ID of the process that sent the signal
	179	*/
	180
	181	/* Values for si_code */
	182
	183	/* Codes for SIGILL */
	184	#define ILL_NOOP 0 /* if only I knew... */
	185	#define ILL_ILLOPC 1 /* illegal opcode */
	186	#define ILL_ILLTRP 2 /* illegal trap */
	187	#define ILL_PRVOPC 3 /* privileged opcode */
	188
	189	/* Codes for SIGFPE */
	190	#define FPE_NOOP 0 /* if only I knew... */
	191	#define FPE_FLTDIV 1 /* floating point divide by zero */
	192	#define FPE_FLTOVF 2 /* floating point overflow */
	193	#define FPE_FLTUND 3 /* floating point underflow */
	194	#define FPE_FLTRES 4 /* floating point inexact result */
	195	#define FPE_FLTINV 5 /* invalid floating point operation */
	196
	197	/* Codes for SIGSEGV */
	198	#define SEGV_NOOP 0 /* if only I knew... */
	199	#define SEGV_MAPERR 1 /* address not mapped to object */
	200	#define SEGV_ACCERR 2 /* invalid permissions for mapped to object */
	201
	202	/* Codes for SIGBUS */
	203	#define BUS_NOOP 0 /* if only I knew... */
	204	#define BUS_ADRALN 1 /* invalid address alignment */
	205
	206	/* Codes for SIGCHLD */
	207	#define CLD_NOOP 0 /* if only I knew... */
	208	#define CLD_EXITED 1 /* child has exited */
	209	#define CLD_KILLED 2
	210	/* child has terminated abnormally and did not create a core file */
	211	#define CLD_DUMPED 3
	212	/* child has terminated abnormally and create a core file */
	213	#define CLD_TRAPPED 4 /* traced child has trapped */
	214	#define CLD_STOPPED 5 /* child has stopped */
	215	#define CLD_CONTINUED 6 /* stopped child has continued */
	216
	217	/* union for signal handlers */
	218	union __sigaction_u {
	219	void (*__sa_handler)(int);
	220	void (__sa_sigaction)(int, struct __siginfo ,
	221	void *);
	222	};
	223
	224	/* Signal vector template for Kernel user boundary */
	225	struct __sigaction {
	226	union __sigaction_u __sigaction_u; /* signal handler */
	227	void (sa_tramp)(void , int, int, siginfo_t , void );
	228	sigset_t sa_mask; /* signal mask to apply */
	229	int sa_flags; /* see signal options below */
	230	};
	231
1c79356b A	232	/*
	233	* Signal vector "template" used in sigaction call.
	234	*/
	235	struct sigaction {
9bccf70c	236	union __sigaction_u __sigaction_u; /* signal handler */
1c79356b A	237	sigset_t sa_mask; /* signal mask to apply */
	238	int sa_flags; /* see signal options below */
	239	};
9bccf70c A	240	/* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
	241	#define sa_handler __sigaction_u.__sa_handler
	242	#define sa_sigaction __sigaction_u.__sa_sigaction
	243
	244
1c79356b A	245	#if !defined(_POSIX_SOURCE)
	246	#define SA_ONSTACK 0x0001 /* take signal on signal stack */
	247	#define SA_RESTART 0x0002 /* restart system on signal return */
	248	#define SA_DISABLE 0x0004 /* disable taking signals on alternate stack */
9bccf70c A	249	#define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
	250	#define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
	251	#define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
	252	#define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
1c79356b	253	#define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */
55e303ae A	254	/* This will provide 64bit register set in a 32bit user address space */
55e303ae A	255	#define SA_64REGSET 0x0200 /* signal handler with SA_SIGINFO args with 64bit regs information */
1c79356b A	256	#endif
	257	#define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
	258
	259	/*
	260	* Flags for sigprocmask:
	261	*/
	262	#define SIG_BLOCK 1 /* block specified signal set */
	263	#define SIG_UNBLOCK 2 /* unblock specified signal set */
	264	#define SIG_SETMASK 3 /* set specified signal set */
	265
9bccf70c A	266	/* POSIX 1003.1b required values. */
	267	#define SI_USER 0x10001
	268	#define SI_QUEUE 0x10002
	269	#define SI_TIMER 0x10003
	270	#define SI_ASYNCIO 0x10004
	271	#define SI_MESGQ 0x10005
	272
1c79356b A	273	#if !defined(_POSIX_SOURCE)
	274	#include <sys/cdefs.h>
	275	typedef void (sig_t) __P((int)); / type of signal function */
	276
	277	/*
	278	* Structure used in sigaltstack call.
	279	*/
	280	struct sigaltstack {
	281	char ss_sp; / signal stack base */
	282	int ss_size; /* signal stack length */
	283	int ss_flags; /* SA_DISABLE and/or SA_ONSTACK */
	284	};
9bccf70c A	285
	286	typedef struct sigaltstack stack_t;
	287
	288	#define SS_ONSTACK 0x0001 /* take signal on signal stack */
	289	#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
55e303ae A	290	#define MINSIGSTKSZ 32768 /* (32K)minimum allowable stack */
55e303ae A	291	#define SIGSTKSZ 131072 /* (128K)recommended stack size */
1c79356b A	292
	293	/*
	294	* 4.3 compatibility:
	295	* Signal vector "template" used in sigvec call.
	296	*/
	297	struct sigvec {
9bccf70c	298	void (sv_handler)(int); / signal handler */
1c79356b A	299	int sv_mask; /* signal mask to apply */
	300	int sv_flags; /* see signal options below */
	301	};
	302
	303	#define SV_ONSTACK SA_ONSTACK
	304	#define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
9bccf70c A	305	#define SV_RESETHAND SA_RESETHAND
	306	#define SV_NODEFER SA_NODEFER
	307	#define SV_NOCLDSTOP SA_NOCLDSTOP
	308	#define SV_SIGINFO SA_SIGINFO
	309
1c79356b A	310	#define sv_onstack sv_flags /* isn't compatibility wonderful! */
	311
	312	/*
	313	* Structure used in sigstack call.
	314	*/
	315	struct sigstack {
	316	char ss_sp; / signal stack pointer */
	317	int ss_onstack; /* current status */
	318	};
	319
	320	/*
	321	* Macro for converting signal number to a mask suitable for
	322	* sigblock().
	323	*/
	324	#define sigmask(m) (1 << ((m)-1))
	325
	326	#ifdef KERNEL
9bccf70c A	327	#ifdef __APPLE_API_PRIVATE
	328	/*
	329	* signals delivered on a per-thread basis.
	330	*/
	331	#define threadmask (sigmask(SIGILL)\|sigmask(SIGTRAP)\|\
	332	sigmask(SIGIOT)\|sigmask(SIGEMT)\|\
	333	sigmask(SIGFPE)\|sigmask(SIGBUS)\|\
	334	sigmask(SIGSEGV)\|sigmask(SIGSYS)\|\
	335	sigmask(SIGPIPE))
	336	#endif /* __APPLE_API_PRIVATE */
1c79356b A	337	#endif /* KERNEL */
	338
	339	#define BADSIG SIG_ERR
	340
	341	#endif /* !_POSIX_SOURCE */
	342	#endif /* !_ANSI_SOURCE */
	343
	344	/*
	345	* For historical reasons; programs expect signal's return value to be
	346	* defined by <sys/signal.h>.
	347	*/
	348	__BEGIN_DECLS
	349	void (signal __P((int, void () __P((int))))) __P((int));
	350	__END_DECLS
	351	#endif /* !_SYS_SIGNAL_H_ */