do_suspend() - Added _POSIX_VDISABLE macro to fully ignore suspend keystroke. Eliminates the possibility that nano can be suspended when it's not supposed to be

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@703 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

@@ -118,6 +118,10 @@ Cvs code -
 	- Don't try to play with the handler inside the handler.  Just
 	  raise a SIGSTOP.  We also now write the "use "fg"" message to
 	  stdout instead of stderr.
+	- Added _POSIX_VDISABLE macro to fully ignore suspend keystroke.
+	  Eliminates the possibility that nano can be suspended when
+	  it's not supposed to be.  Many many many thanks to Jordi and
+	  Tom Lear for helping out finding and fixing this bug!
   do_cont()
 	- Now just does a refresh call instead of playing with the SIGTSTP
 	  handler.

nano.c

@@ -1740,6 +1740,9 @@ void handle_sigwinch(int s)
 
 void signal_init(void)
 {
+#ifdef _POSIX_VDISABLE
+    struct termios term;
+#endif
 
     /* Trap SIGINT and SIGQUIT cuz we want them to do useful things. */
     memset(&act, 0, sizeof(struct sigaction));
@@ -1754,7 +1757,17 @@ void signal_init(void)
     sigaction(SIGWINCH, &act, NULL);
 
     if (!ISSET(SUSPEND)) {
+
+/* Insane! */
+#ifdef _POSIX_VDISABLE
+	tcgetattr(0, &term);
+	term.c_cc[VSUSP] = _POSIX_VDISABLE;
+	tcsetattr(0, TCSANOW, &term);
+#else
+	act.sa_handler = SIG_IGN;
 	sigaction(SIGTSTP, &act, NULL);
+#endif
+
     } else {
 	/* if we don't do this, it seems other stuff interrupts the
 	   suspend handler!  Try using nano with mutt without this line */