hangup revisited (trunk only)

More SAFER_HANGUP tweaking.  Delay its kicking in until main command
loop has been reached, and shut if off again once program is terminating.

include/decl.h

@@ -152,9 +152,8 @@ E NEARDATA struct sinfo {
 #endif
 	int something_worth_saving;	/* in case of panic */
 	int panicking;		/* `panic' is in progress */
-#if defined(VMS) || defined(WIN32)
 	int exiting;		/* an exit handler is executing */
-#endif
+	int in_moveloop;
 	int in_impossible;
 #ifdef PANICLOG
 	int in_paniclog;

src/allmain.c

@@ -76,6 +76,7 @@ boolean resuming;
     youmonst.movement = NORMAL_SPEED;	/* give the hero some movement points */
     context.move = 0;
 
+    program_state.in_moveloop = 1;
     for(;;) {
 #ifdef SAFERHANGUP
 	if (program_state.done_hup) end_of_input();

src/cmd.c

@@ -2842,6 +2842,7 @@ void
 hangup(sig_unused) /* called as signal() handler, so sent at least one arg */
 int sig_unused;
 {
+	if (program_state.exiting) program_state.in_moveloop = 0;
 	nhwindows_hangup();
 # ifdef SAFERHANGUP
 	/* When using SAFERHANGUP, the done_hup flag it tested in rhack
@@ -2852,7 +2853,8 @@ int sig_unused;
 	   must continue running longer before attempting a hangup save. */
 	program_state.done_hup++;
 	/* defer hangup iff game appears to be in progress */
-	if (program_state.something_worth_saving) return;
+	if (program_state.in_moveloop && program_state.something_worth_saving)
+	    return;
 # endif /* SAFERHANGUP */
 	end_of_input();
 }

src/end.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)end.c	3.5	2007/01/02	*/
+/*	SCCS Id: @(#)end.c	3.5	2007/02/28	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -1023,6 +1023,7 @@ void
 terminate(status)
 int status;
 {
+	program_state.in_moveloop = 0;	/* won't be returning to normal play */
 #ifdef MAC
 	getreturn("to exit");
 #endif
@@ -1038,6 +1039,7 @@ int status;
 	   that would cancel any other pending user-mode handlers */
 	if (program_state.exiting) return;
 #endif
+	program_state.exiting = 1;
 	nethack_exit(status);
 }
 

sys/vms/vmsmain.c

@@ -375,9 +375,6 @@ byebye()
 	    hup != (void FDECL((*),(int))) SIG_DFL &&
 	    hup != (void FDECL((*),(int))) SIG_IGN) {
 	(*hup)(SIGHUP);
-#ifdef SAFERHANGUP
-	end_of_input();
-#endif
     }
 
 #ifdef CHDIR