#include	"defs.h"
#include	<signal.h>


/* ========	fault handling routines	   ======== */
#define MAXSIG 16
#define SIGSET 01
#define SIGMOD 02
CHAR	trapflg[MAXSIG];
INT	mkfault;
ERR	sigerr;


INT	fault(sig)
	REG INT		sig;
{
	signal(sig,fault);
	mkfault |= SIGSET;
	trapflg[sig] |= SIGSET;
}

ignsig(n)
{
	REG INT		i;

	IF (signal(i=n,SIG_IGN)!=SIG_IGN)
	THEN	trapflg[i] |= SIGMOD;
		return(0);
	ELSE	return(1);
	FI
}

getsig(n)
{
	REG INT		i;

	IF trapflg[i=n]&SIGMOD ORF ignsig(i)==0
	THEN	signal(i,fault);
	FI
}

stdsigs()
{
	getsig(SIGINT);
	ignsig(SIGQUIT);
	getsig(SIGKILL);
}

oldsigs()
{
	REG INT i=MAXSIG;

	WHILE i--
	DO clrsig(i); OD
	mkfault=0;
}

clrsig(i)
	INT		i;
{
	IF trapflg[i]&SIGMOD
	THEN	signal(i,fault);
		trapflg[i] &= ~SIGMOD;
	FI
}

sigchk()
{
	/* if signals then longjmp */
	IF mkfault
	THEN	longjmp(sigerr, 1);
		abend("sigchk jump");
	FI
}