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for non-tty TIOCSPGRP/F_SETOWN/FIOSETOWN pgid setting calls, store uid
and euid as well, then deliver them using new csignal() interface
which ensures that pgid setting process is permitted to signal the
pgid process(es). Thanks to newsham@aloha.net for extensive help and
discussion.

/*	$OpenBSD: signalvar.h,v 1.7 1997/08/31 20:42:01 deraadt Exp $	*/
/*	$NetBSD: signalvar.h,v 1.17 1996/04/22 01:23:31 christos Exp $	*/

/*
 * 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	8.3 (Berkeley) 1/4/94
 */

#ifndef	_SYS_SIGNALVAR_H_		/* tmp for user.h */
#define	_SYS_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_sigreset;		/* signals that reset when caught */
	sigset_t ps_siginfo;		/* signals that provide siginfo */
	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 */
	long	ps_code;		/* 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 (*) __P((int)))2
#define	SIG_HOLD	(void (*) __P((int)))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 issignal().
 */
#define	CURSIG(p)							\
	(((p)->p_siglist == 0 ||					\
	    (((p)->p_flag & P_TRACED) == 0 &&				\
	    ((p)->p_siglist & ~(p)->p_sigmask) == 0)) ?			\
	    0 : issignal(p))

/*
 * Clear a pending signal from a process.
 */
#define	CLRSIG(p, sig)	{ (p)->p_siglist &= ~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	contsigmask	(sigmask(SIGCONT))
#define	stopsigmask	(sigmask(SIGSTOP) | sigmask(SIGTSTP) | \
			    sigmask(SIGTTIN) | sigmask(SIGTTOU))

#endif /* SIGPROP */

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

#ifdef _KERNEL
/*
 * Machine-independent functions:
 */
int	coredump __P((struct proc *p));
void	execsigs __P((struct proc *p));
void	gsignal __P((int pgid, int sig));
void	csignal __P((pid_t pgid, int signum, uid_t uid, uid_t euid));
int	issignal __P((struct proc *p));
void	pgsignal __P((struct pgrp *pgrp, int sig, int checkctty));
void	postsig __P((int sig));
void	psignal __P((struct proc *p, int sig));
void	siginit __P((struct proc *p));
void	trapsignal __P((struct proc *p, int sig, u_long code, int type,
	    union sigval val));
void	sigexit __P((struct proc *, int));
void	setsigvec __P((struct proc *, int, struct sigaction *));
int	killpg1 __P((struct proc *, int, int, int));

/*
 * Machine-dependent functions:
 */
void	sendsig __P((sig_t action, int sig, int returnmask, u_long code,
	    int type, union sigval val));
struct core;
struct vnode;
struct ucred;
int	cpu_coredump __P((struct proc *, struct vnode *, struct ucred *,
			  struct core *));
#endif	/* _KERNEL */
#endif	/* !_SYS_SIGNALVAR_H_ */