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#ifndef lint
static char rcsid[] = "$NetBSD: signal.c,v 1.5 1995/12/21 11:27:51 mycroft Exp $";
#endif /* not lint */
#include <signal.h>
#include "header.h" /* "Larn is copyrighted 1986 by Noah Morgan.\n" */
#include <string.h>
#define BIT(a) (1<<((a)-1))
extern char savefilename[],wizard,predostuff,nosignal;
static s2choose() /* text to be displayed if ^C during intro screen */
{
cursor(1,24); lprcat("Press "); setbold(); lprcat("return"); resetbold();
lprcat(" to continue: "); lflush();
}
static void
cntlc() /* what to do for a ^C */
{
if (nosignal) return; /* don't do anything if inhibited */
signal(SIGQUIT,SIG_IGN); signal(SIGINT,SIG_IGN);
quit(); if (predostuff==1) s2choose(); else showplayer();
lflush();
signal(SIGQUIT,cntlc); signal(SIGINT,cntlc);
}
/*
* subroutine to save the game if a hangup signal
*/
static void
sgam()
{
savegame(savefilename); wizard=1; died(-257); /* hangup signal */
}
#ifdef SIGTSTP
static void
tstop() /* control Y */
{
if (nosignal) return; /* nothing if inhibited */
lcreat((char*)0); clearvt100(); lflush(); signal(SIGTSTP,SIG_DFL);
#ifdef SIGVTALRM
/* looks like BSD4.2 or higher - must clr mask for signal to take effect*/
sigsetmask(sigblock(0)& ~BIT(SIGTSTP));
#endif
kill(getpid(),SIGTSTP);
setupvt100(); signal(SIGTSTP,tstop);
if (predostuff==1) s2choose(); else drawscreen();
showplayer(); lflush();
}
#endif SIGTSTP
/*
* subroutine to issue the needed signal traps called from main()
*/
static void sigpanic();
sigsetup()
{
signal(SIGQUIT, cntlc); signal(SIGINT, cntlc);
signal(SIGKILL, SIG_IGN); signal(SIGHUP, sgam);
signal(SIGILL, sigpanic); signal(SIGTRAP, sigpanic);
signal(SIGIOT, sigpanic); signal(SIGEMT, sigpanic);
signal(SIGFPE, sigpanic); signal(SIGBUS, sigpanic);
signal(SIGSEGV, sigpanic); signal(SIGSYS, sigpanic);
signal(SIGPIPE, sigpanic); signal(SIGTERM, sigpanic);
#ifdef SIGTSTP
signal(SIGTSTP,tstop); signal(SIGSTOP,tstop);
#endif SIGTSTP
}
/*
* routine to process a fatal error signal
*/
static void
sigpanic(sig)
int sig;
{
char buf[128];
signal(sig,SIG_DFL);
sprintf(buf,"\nLarn - Panic! Signal %d received [SIG%s]",sig,sys_signame[sig]);
write(2,buf,strlen(buf)); sleep(2);
sncbr();
savegame(savefilename);
kill(getpid(),sig); /* this will terminate us */
}
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