xref: /freebsd-10.1-release/sys/sys/signal.h

/*
 * 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	8.4 (Berkeley) 5/4/95
 * $Id: signal.h,v 1.14 1998/08/05 09:04:36 dfr Exp $
 */

#ifndef	_SYS_SIGNAL_H_
#define	_SYS_SIGNAL_H_

#include <sys/cdefs.h>
#include <sys/_posix.h>
#include <machine/signal.h>	/* sig_atomic_t; trap codes; sigcontext */

#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
#define NSIG	32		/* counting 0; could be 33 (mask is 1-32) */
#endif

#define	SIGHUP	1	/* hangup */
#define	SIGINT	2	/* interrupt */
#define	SIGQUIT	3	/* quit */
#define	SIGILL	4	/* illegal instruction (not reset when caught) */
#ifndef _POSIX_SOURCE
#define	SIGTRAP	5	/* trace trap (not reset when caught) */
#endif
#define	SIGABRT	6	/* abort() */
#ifndef _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) */
#ifndef _POSIX_SOURCE
#define	SIGBUS	10	/* bus error */
#endif
#define	SIGSEGV	11	/* segmentation violation */
#ifndef _POSIX_SOURCE
#define	SIGSYS	12	/* non-existent system call invoked */
#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 */
#ifndef _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) */
#ifndef _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 */

/*-
 * Type of a signal handling function.
 *
 * Language spec sez signal handlers take exactly one arg, even though we
 * actually supply three.  Ugh!
 *
 * We don't try to hide the difference by leaving out the args because
 * that would cause warnings about conformant programs.  Nonconformant
 * programs can avoid the warnings by casting to (__sighandler_t *) or
 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
 *
 * The kernel should reverse the cast before calling the function.  It
 * has no way to do this, but on most machines 1-arg and 3-arg functions
 * have the same calling protocol so there is no problem in practice.
 * A bit in sa_flags could be used to specify the number of args.
 */
typedef void __sighandler_t __P((int));

#if defined(_P1003_1B_VISIBLE_HISTORICALLY) || \
	(!defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE))
union sigval {
	/* Members as suggested by Annex C of POSIX 1003.1b. */
	int   sigval_int;
	void *sigval_ptr;
};
#endif /* !_ANSI_SOURCE && _P1003_1B_VISIBLE_HISTORICALLY */

#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
/* 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

/* Additional FreeBSD values. */
#define SI_UNDEFINED  0

struct __siginfo {
	struct sigcontext si_sc;
	int               si_signo;              /* signal number */

	/*
	 * Cause of signal, one of the SI_ macros or signal-specific
	 * values, i.e. one of the FPE_... values for SIGFPE. This
	 * value is equivalent to the second argument to an old-style
	 * FreeBSD signal handler.
	 */
	int               si_code;

	union sigval      si_value;
};
#else /* ! _ANSI_SOURCE && ! _POSIX_SOURCE */
struct __siginfo;
#endif /* ! _ANSI_SOURCE && ! _POSIX_SOURCE */

typedef struct __siginfo siginfo_t;

#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
typedef void __siginfohandler_t __P((int, siginfo_t *, void *));
#endif /* ! _ANSI_SOURCE && ! _POSIX_SOURCE */

#define	SIG_DFL		((__sighandler_t *)0)
#define	SIG_IGN		((__sighandler_t *)1)
#define	SIG_ERR		((__sighandler_t *)-1)

#ifndef _ANSI_SOURCE
typedef unsigned int sigset_t;

/*
 * Signal vector "template" used in sigaction call.
 */
struct	sigaction {
	union {
		void    (*__sa_handler) __P((int));
		void    (*__sa_sigaction) __P((int, siginfo_t *, void *));
	} __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
#ifndef _POSIX_SOURCE
#define	sa_sigaction	__sigaction_u.__sa_sigaction
#endif

#ifndef _POSIX_SOURCE
#define SA_ONSTACK	0x0001	/* take signal on signal stack */
#define SA_RESTART	0x0002	/* restart system call 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 keep zombies around */
#define	SA_SIGINFO	0x0040	/* signal handler with SA_SIGINFO args */
#ifdef COMPAT_SUNOS
#define	SA_USERTRAMP	0x0100	/* do not bounce off kernel's sigtramp */
#endif
#endif	/* _POSIX_SOURCE */
#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 */

#ifndef _POSIX_SOURCE
typedef	__sighandler_t	*sig_t;	/* type of pointer to a signal function */

#ifdef	_BSD_SIZE_T_
typedef	_BSD_SIZE_T_	size_t;
#undef	_BSD_SIZE_T_
#endif

/*
 * Structure used in sigaltstack call.
 */
struct	sigaltstack {
	char	*ss_sp;			/* signal stack base */
	size_t	ss_size;		/* signal stack length */
	int	ss_flags;		/* SS_DISABLE and/or SS_ONSTACK */
};
#define	SS_ONSTACK	0x0001	/* take signal on alternate stack */
#define	SS_DISABLE	0x0004	/* disable taking signals on alternate stack */
#define	MINSIGSTKSZ	8192			/* minimum allowable stack */
#define	SIGSTKSZ	(MINSIGSTKSZ + 32768)	/* recommended stack size */

/*
 * 4.3 compatibility:
 * Signal vector "template" used in sigvec call.
 */
struct	sigvec {
	__sighandler_t *sv_handler;	/* 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))

#define	BADSIG		SIG_ERR

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

#if !defined(_ANSI_SOURCE) && defined(_P1003_1B_VISIBLE_HISTORICALLY)

struct sigevent {
	int	sigev_notify;		/* Notification type */
	int	sigev_signo;		/* Signal number */
	union sigval sigev_value;	/* Signal value */
};

#define	SIGEV_NONE	0		/* No async notification */
#define	SIGEV_SIGNAL	1		/* Generate a queued signal */

#endif /* ! _ANSI_SOURCE && _P1003_1B_VISIBLE_HISTORICALLY */

/*
 * For historical reasons; programs expect signal's return value to be
 * defined by <sys/signal.h>.
 */
__BEGIN_DECLS
__sighandler_t *signal __P((int, __sighandler_t *));
__END_DECLS

#endif	/* !_SYS_SIGNAL_H_ */