first pass at function prototypes with cdefs.h

[unix-history] / usr / src / sys / sys / signal.h

/*
 * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)signal.h	7.15 (Berkeley) %G%
 */

#ifndef	_SIGNAL_H_
#define	_SIGNAL_H_

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

#ifndef _POSIX_SOURCE
#include <machine/trap.h>	/* codes for SIGILL, SIGFPE */
#endif /* _POSIX_SOURCE */

#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	/* 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 */
#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 */

#ifndef _POSIX_SOURCE
typedef	void (*sig_t)();
#endif

#ifndef KERNEL
void	(*signal())();
#endif

typedef unsigned int sigset_t;

#include <sys/cdefs.h>

__BEGIN_DECLS
int	sigaddset __P((sigset_t *, int));
int	sigdelset __P((sigset_t *, int));
int	sigemptyset __P((sigset_t *));
int	sigfillset __P((sigset_t *));
int	sigismember __P((const sigset_t *, int));
__END_DECLS

#define sigemptyset(set)	( *(set) = 0 )
#define sigfillset(set)		( *(set) = ~(sigset_t)0, 0 )
#define sigaddset(set, signo)	( *(set) |= 1 << ((signo) - 1), 0)
#define sigdelset(set, signo)	( *(set) &= ~(1 << ((signo) - 1)), 0)
#define sigismember(set, signo)	( (*(set) & (1 << ((signo) - 1))) != 0)

/*
 * Signal vector "template" used in sigaction call.
 */
struct	sigaction {
	void	(*sa_handler)();	/* signal handler */
	sigset_t sa_mask;		/* signal mask to apply */
	int	sa_flags;		/* see signal options below */
};
#ifndef _POSIX_SOURCE
#define SA_ONSTACK	0x0001	/* take signal on signal stack */
#define SA_RESTART	0x0002	/* do not restart system on signal return */
#endif
#define SA_NOCLDSTOP	0x0004	/* 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
/*
 * 4.3 compatibility:
 * Signal vector "template" used in sigvec call.
 */
struct	sigvec {
	void	(*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_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 */
};

/*
 * Information pushed on stack when a signal is delivered.
 * This is used by the kernel to restore state following
 * execution of the signal handler.  It is also made available
 * to the handler to allow it to restore state properly if
 * a non-standard exit is performed.
 */
struct	sigcontext {
	int	sc_onstack;		/* sigstack state to restore */
	int	sc_mask;		/* signal mask to restore */
	int	sc_sp;			/* sp to restore */
	int	sc_fp;			/* fp to restore */
	int	sc_ap;			/* ap to restore */
	int	sc_pc;			/* pc to restore */
	int	sc_ps;			/* psl to restore */
};

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

#define	BADSIG		(void (*)())-1
#endif	/* _POSIX_SOURCE */

#define	SIG_DFL		(void (*)())0
#define	SIG_IGN		(void (*)())1

#ifdef KERNEL
#define	SIG_CATCH	(void (*)())2
#define	SIG_HOLD	(void (*)())3

#define	sigcantmask	(sigmask(SIGKILL)|sigmask(SIGSTOP))
/*
 * get signal action for process and signal; currently only for current process
 */
#define SIGACTION(p, sig)	(u.u_signal[(sig)])

/*
 * Determine signal that should be delivered to process p, the current process,
 * 0 if none.  If there is a pending stop signal with default action,
 * the process stops in issig().
 */
#define	CURSIG(p) \
	(((p)->p_sig == 0 || \
	    ((p)->p_flag&STRC) == 0 && ((p)->p_sig &~ (p)->p_sigmask) == 0) ? \
	    0 : issig())

/*
 * Clear a pending signal from a process.
 */
#define	CLRSIG(p, sig)	{ (p)->p_sig &= ~sigmask(sig); }

#endif /* KERNEL */

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

__BEGIN_DECLS
int	kill __P((pid_t, int));
int	sigaction __P((int, const struct sigaction *, struct sigaction *));
int	sigpending __P((sigset_t *));
int	sigprocmask __P((int, const sigset_t *, sigset_t *));
int	sigsuspend __P((const sigset_t *));
__END_DECLS
#endif
#endif	/* !_SIGNAL_H_ */