/*
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 *
 *	@(#)signalvar.h	8.6 (Berkeley) 2/19/95
 * $FreeBSD: src/sys/sys/signalvar.h,v 1.34.2.1 2000/05/16 06:58:05 dillon Exp $
 * $DragonFly: src/sys/sys/signalvar.h,v 1.13 2006/04/28 18:23:45 swildner Exp $
 */

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

/*
 * Don't bring in the entire bleeding include set if we aren't the kernel.
 * Userland is not allowed to bring in sys/proc.h except under special
 * circumstances (e.g. sys/user.h)
 */
#include <sys/signal.h>
#ifdef _KERNEL
#include <sys/proc.h>
#include <machine/lock.h>
#endif

/*
 * 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[_SIG_MAXSIG];	/* disposition of signals */
	sigset_t ps_catchmask[_SIG_MAXSIG];	/* signals to be blocked */
	sigset_t ps_sigonstack;		/* signals to take on sigstack */
	sigset_t ps_sigintr;		/* signals that interrupt syscalls */
	sigset_t ps_sigreset;		/* signals that reset when caught */
	sigset_t ps_signodefer;		/* signals not masked while handled */
	sigset_t ps_siginfo;		/* signals that want SA_SIGINFO args */
	sigset_t ps_usertramp;		/* SunOS compat; libc sigtramp XXX */
};

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

#ifdef _KERNEL

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

#endif

/*
 * sigset_t manipulation macros
 */
#define SIGADDSET(set, signo)						\
	(set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo)

#define SIGDELSET(set, signo)						\
	(set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo)

#define SIGEMPTYSET(set)						\
	do {								\
		int __i;						\
		for (__i = 0; __i < _SIG_WORDS; __i++)			\
			(set).__bits[__i] = 0;				\
	} while (0)

#define SIGFILLSET(set)							\
	do {								\
		int __i;						\
		for (__i = 0; __i < _SIG_WORDS; __i++)			\
			(set).__bits[__i] = ~(unsigned int)0;		\
	} while (0)

#define SIGISMEMBER(set, signo)						\
	((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo))

#define SIGISEMPTY(set)		__sigisempty(&(set))
#define SIGNOTEMPTY(set)	(!__sigisempty(&(set)))

#define SIGSETEQ(set1, set2)	__sigseteq(&(set1), &(set2))
#define SIGSETNEQ(set1, set2)	(!__sigseteq(&(set1), &(set2)))

#define SIGSETOR(set1, set2)						\
	do {								\
		int __i;						\
		for (__i = 0; __i < _SIG_WORDS; __i++)			\
			(set1).__bits[__i] |= (set2).__bits[__i];	\
	} while (0)

#define SIGSETAND(set1, set2)						\
	do {								\
		int __i;						\
		for (__i = 0; __i < _SIG_WORDS; __i++)			\
			(set1).__bits[__i] &= (set2).__bits[__i];	\
	} while (0)

#define SIGSETNAND(set1, set2)						\
	do {								\
		int __i;						\
		for (__i = 0; __i < _SIG_WORDS; __i++)			\
			(set1).__bits[__i] &= ~(set2).__bits[__i];	\
	} while (0)

#define SIG_CANTMASK(set)						\
	SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP)

#define SIG_STOPSIGMASK(set)						\
	SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP),		\
	SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU)

#define SIG_CONTSIGMASK(set)						\
	SIGDELSET(set, SIGCONT)

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

static __inline int
__sigisempty(sigset_t *set)
{
	int i;

	for (i = 0; i < _SIG_WORDS; i++) {
		if (set->__bits[i])
			return (0);
	}
	return (1);
}

static __inline int
__sigseteq(sigset_t *set1, sigset_t *set2)
{
	int i;

	for (i = 0; i < _SIG_WORDS; i++) {
		if (set1->__bits[i] != set2->__bits[i])
			return (0);
	}
	return (1);
}

#ifdef _KERNEL

typedef void (*proc_func_t)(struct proc *);

struct pgrp;
struct proc;
struct sigio;
struct vmupcall;

extern int sugid_coredump;	/* Sysctl variable kern.sugid_coredump */

/*
 * Machine-independent functions:
 */
void	check_sigacts (void);
void	execsigs (struct proc *p);
void	gsignal (int pgid, int sig);
int	issignal (struct proc *p);
int	iscaught (struct proc *p);
void	killproc (struct proc *p, char *why);
void	pgsigio (struct sigio *, int signum, int checkctty);
void	pgsignal (struct pgrp *pgrp, int sig, int checkctty);
void	postsig (int sig);
void	psignal (struct proc *p, int sig);
void	siginit (struct proc *p);
void	trapsignal (struct proc *p, int sig, u_long code);
static int __cursig (struct proc *p);

/*
 * Machine-dependent functions:
 */
void	sendsig (sig_t action, int sig, sigset_t *retmask, u_long code);
void	sendupcall (struct vmupcall *vu, int morepending);
int	fetchupcall (struct vmupcall *vu, int morepending, void *rsp);
void	sigexit (struct proc *p, int sig);
int	checkpoint_signal_handler(struct proc *p);

/*
 * Inline functions:
 */
#define	CURSIG(p)	__cursig(p)

/*
 * 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 issignal().
 *
 * MP SAFE
 */
static __inline int __cursig(struct proc *p)
{
	sigset_t tmpset;
	int r;

	tmpset = p->p_siglist;
	SIGSETNAND(tmpset, p->p_sigmask);
	if (SIGISEMPTY(p->p_siglist) ||
	     (!(p->p_flag & P_TRACED) && SIGISEMPTY(tmpset))) {
		return(0);
	}
	r = issignal(p);
	return(r);
}

#endif	/* _KERNEL */

#endif	/* !_SYS_SIGNALVAR_H_ */