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/* $NetBSD: signal.c,v 1.9 2012/06/19 05:30:44 dholland Exp $ */
/* "Larn is copyrighted 1986 by Noah Morgan.\n" */
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: signal.c,v 1.9 2012/06/19 05:30:44 dholland Exp $");
#endif /* not lint */
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "header.h"
#include "extern.h"
static void s2choose(void);
static void cntlc(int);
static void sgam(int);
static void tstop(int);
static void sigpanic(int);
#define BIT(a) (1<<((a)-1))
static void
s2choose(void)
{ /* 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(int n)
{ /* 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(int n)
{
savegame(savefilename);
wizard = 1;
died(-257); /* hangup signal */
}
#ifdef SIGTSTP
static void
tstop(int n)
{ /* 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()
*/
void
sigsetup(void)
{
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); 20150209 bkw: not on linux */
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(int sig)
{
char buf[128];
signal(sig, SIG_DFL);
snprintf(buf, sizeof(buf),
"\nLarn - Panic! Signal %d received [%s]", sig,
sys_siglist[sig]); /* 20150209 bkw: no sys_signame on linux */
write(2, buf, strlen(buf));
sleep(2);
sncbr();
savegame(savefilename);
kill(getpid(), sig); /* this will terminate us */
}
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