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#ifndef lint
static char rcsid[] = "$NetBSD: signal.c,v 1.4 1995/04/24 12:24:12 cgd 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();
static void sigill() { sigpanic(SIGILL); }
static void sigtrap() { sigpanic(SIGTRAP); }
static void sigiot() { sigpanic(SIGIOT); }
static void sigemt() { sigpanic(SIGEMT); }
static void sigfpe() { sigpanic(SIGFPE); }
static void sigbus() { sigpanic(SIGBUS); }
static void sigsegv() { sigpanic(SIGSEGV); }
static void sigsys() { sigpanic(SIGSYS); }
static void sigpipe() { sigpanic(SIGPIPE); }
static void sigterm() { sigpanic(SIGTERM); }
sigsetup()
{
signal(SIGQUIT, cntlc); signal(SIGINT, cntlc);
signal(SIGKILL, SIG_IGN); signal(SIGHUP, sgam);
signal(SIGILL, sigill); signal(SIGTRAP, sigtrap);
signal(SIGIOT, sigiot); signal(SIGEMT, sigemt);
signal(SIGFPE, sigfpe); signal(SIGBUS, sigbus);
signal(SIGSEGV, sigsegv); signal(SIGSYS, sigsys);
signal(SIGPIPE, sigpipe); signal(SIGTERM, sigterm);
#ifdef SIGTSTP
signal(SIGTSTP,tstop); signal(SIGSTOP,tstop);
#endif SIGTSTP
}
#ifdef BSD /* for BSD UNIX? */
static char *signame[NSIG] = { "",
"SIGHUP", /* 1 hangup */
"SIGINT", /* 2 interrupt */
"SIGQUIT", /* 3 quit */
"SIGILL", /* 4 illegal instruction (not reset when caught) */
"SIGTRAP", /* 5 trace trap (not reset when caught) */
"SIGIOT", /* 6 IOT instruction */
"SIGEMT", /* 7 EMT instruction */
"SIGFPE", /* 8 floating point exception */
"SIGKILL", /* 9 kill (cannot be caught or ignored) */
"SIGBUS", /* 10 bus error */
"SIGSEGV", /* 11 segmentation violation */
"SIGSYS", /* 12 bad argument to system call */
"SIGPIPE", /* 13 write on a pipe with no one to read it */
"SIGALRM", /* 14 alarm clock */
"SIGTERM", /* 15 software termination signal from kill */
"SIGURG", /* 16 urgent condition on IO channel */
"SIGSTOP", /* 17 sendable stop signal not from tty */
"SIGTSTP", /* 18 stop signal from tty */
"SIGCONT", /* 19 continue a stopped process */
"SIGCHLD", /* 20 to parent on child stop or exit */
"SIGTTIN", /* 21 to readers pgrp upon background tty read */
"SIGTTOU", /* 22 like TTIN for output if (tp->t_local<OSTOP) */
"SIGIO", /* 23 input/output possible signal */
"SIGXCPU", /* 24 exceeded CPU time limit */
"SIGXFSZ", /* 25 exceeded file size limit */
"SIGVTALRM",/* 26 virtual time alarm */
"SIGPROF", /* 27 profiling time alarm */
"","","","" };
#else BSD /* for system V? */
static char *signame[NSIG] = { "",
"SIGHUP", /* 1 hangup */
"SIGINT", /* 2 interrupt */
"SIGQUIT", /* 3 quit */
"SIGILL", /* 4 illegal instruction (not reset when caught) */
"SIGTRAP", /* 5 trace trap (not reset when caught) */
"SIGIOT", /* 6 IOT instruction */
"SIGEMT", /* 7 EMT instruction */
"SIGFPE", /* 8 floating point exception */
"SIGKILL", /* 9 kill (cannot be caught or ignored) */
"SIGBUS", /* 10 bus error */
"SIGSEGV", /* 11 segmentation violation */
"SIGSYS", /* 12 bad argument to system call */
"SIGPIPE", /* 13 write on a pipe with no one to read it */
"SIGALRM", /* 14 alarm clock */
"SIGTERM", /* 15 software termination signal from kill */
"SIGUSR1", /* 16 user defines signal 1 */
"SIGUSR2", /* 17 user defines signal 2 */
"SIGCLD", /* 18 child death */
"SIGPWR", /* 19 power fail */
"","","","","","","","","","","","" };
#endif BSD
/*
* 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 [%s]",sig,signame[sig]);
write(2,buf,strlen(buf)); sleep(2);
sncbr();
savegame(savefilename);
kill(getpid(),sig); /* this will terminate us */
}
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