/*
 * Copyright (c) 1991 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)signalvar.h	7.5 (Berkeley) 04/20/92
 */

#ifndef	_SIGNALVAR_H_		/* tmp for user.h */
#define	_SIGNALVAR_H_

/*
 * Kernel signal definitions and data structures,
 * not exported to user programs.
 */

/*
 * Process signal actions and state, needed only within the process
 * (not necessarily resident).
 */
struct	sigacts {
	sig_t	ps_sigact[NSIG];	/* disposition of signals */
	sigset_t ps_catchmask[NSIG];	/* signals to be blocked */
	sigset_t ps_sigonstack;		/* signals to take on sigstack */
	sigset_t ps_sigintr;		/* signals that interrupt syscalls */
	sigset_t ps_oldmask;		/* saved mask from before sigpause */
	int	ps_flags;		/* signal flags, below */
	struct	sigaltstack ps_sigstk;	/* sp & on stack state variable */
	int	ps_sig;			/* for core dump/debugger XXX */
	int	ps_code;		/* for core dump/debugger XXX */
	int	ps_addr;		/* for core dump/debugger XXX */
	sigset_t ps_usertramp;		/* SunOS compat; libc sigtramp XXX */
};

/* signal flags */
#define	SAS_OLDMASK	0x01		/* need to restore mask before pause */
#define	SAS_ALTSTACK	0x02		/* have alternate signal stack */

/* additional signal action values, used only temporarily/internally */
#define	SIG_CATCH	(void (*)())2
#define	SIG_HOLD	(void (*)())3

/*
 * get signal action for process and signal; currently only for current process
 */
#define SIGACTION(p, sig)	(p->p_sigacts->ps_sigact[(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(p))

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

/*
 * Signal properties and actions.
 * The array below categorizes the signals and their default actions
 * according to the following properties:
 */
#define	SA_KILL		0x01		/* terminates process by default */
#define	SA_CORE		0x02		/* ditto and coredumps */
#define	SA_STOP		0x04		/* suspend process */
#define	SA_TTYSTOP	0x08		/* ditto, from tty */
#define	SA_IGNORE	0x10		/* ignore by default */
#define	SA_CONT		0x20		/* continue if suspended */
#define	SA_CANTMASK	0x40		/* non-maskable, catchable */

#ifdef	SIGPROP
int sigprop[NSIG + 1] = {
	0,			/* unused */
	SA_KILL,		/* SIGHUP */
	SA_KILL,		/* SIGINT */
	SA_KILL|SA_CORE,	/* SIGQUIT */
	SA_KILL|SA_CORE,	/* SIGILL */
	SA_KILL|SA_CORE,	/* SIGTRAP */
	SA_KILL|SA_CORE,	/* SIGABRT */
	SA_KILL|SA_CORE,	/* SIGEMT */
	SA_KILL|SA_CORE,	/* SIGFPE */
	SA_KILL,		/* SIGKILL */
	SA_KILL|SA_CORE,	/* SIGBUS */
	SA_KILL|SA_CORE,	/* SIGSEGV */
	SA_KILL|SA_CORE,	/* SIGSYS */
	SA_KILL,		/* SIGPIPE */
	SA_KILL,		/* SIGALRM */
	SA_KILL,		/* SIGTERM */
	SA_IGNORE,		/* SIGURG */
	SA_STOP,		/* SIGSTOP */
	SA_STOP|SA_TTYSTOP,	/* SIGTSTP */
	SA_IGNORE|SA_CONT,	/* SIGCONT */
	SA_IGNORE,		/* SIGCHLD */
	SA_STOP|SA_TTYSTOP,	/* SIGTTIN */
	SA_STOP|SA_TTYSTOP,	/* SIGTTOU */
	SA_IGNORE,		/* SIGIO */
	SA_KILL,		/* SIGXCPU */
	SA_KILL,		/* SIGXFSZ */
	SA_KILL,		/* SIGVTALRM */
	SA_KILL,		/* SIGPROF */
	SA_IGNORE,		/* SIGWINCH  */
	SA_IGNORE,		/* SIGINFO */
	SA_KILL,		/* SIGUSR1 */
	SA_KILL,		/* SIGUSR2 */
};

#define	stopsigmask	(sigmask(SIGSTOP)|sigmask(SIGTSTP)|\
			 sigmask(SIGTTIN)|sigmask(SIGTTOU))
#define	contsigmask	(sigmask(SIGCONT))

#endif /* SIGPROP */

#define	sigcantmask	(sigmask(SIGKILL)|sigmask(SIGSTOP))

#ifdef KERNEL
/*
 * Machine-independent functions:
 */
void	siginit __P((struct proc *p));
void	execsigs __P((struct proc *p));
void	gsignal __P((int pgid, int sig));
void	pgsignal __P((struct pgrp *pgrp, int sig, int checkctty));
void	trapsignal __P((struct proc *p, int sig, unsigned code));
void	psignal __P((struct proc *p, int sig));
int	issig __P((struct proc *p));
void	psig __P((int sig));
int	coredump __P((struct proc *p));

/*
 * Machine-dependent functions:
 */
void	sendsig __P((sig_t action, int sig, int returnmask, unsigned code));
#endif	/* KERNEL */
#endif	/* !_SIGNALVAR_H_ */