1 files changed, 138 insertions, 0 deletions
diff --git a/larn/signal.c b/larn/signal.c
new file mode 100644
index 0000000..807579a
--- /dev/null
+++ b/larn/signal.c
@@ -0,0 +1,138 @@
+/*	$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 */
+}