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From: bd@hpsemc.HP.COM (bob desinger)
Newsgroups: comp.emacs
Subject: Suspending GNU 18.51 on HP s800
Message-ID: <690015@hpsemc.HP.COM>
Date: 29 May 88 08:18:57 GMT
Organization: HP Technology Access Center, Cupertino, CA
Lines: 39

In src/sysdep.c near line 479, sys_suspend() decides to suspend Emacs
or fork a subshell depending if you're BSD or not.  The code goes like
this [edited a bit]:

	sys_suspend ()
	{
	#ifdef VMS
	  [VMS code calling LIB$ATTACH]

	#else
	#ifdef BSD	/* line 479 */
	  killpg (getpgrp (0), SIGTSTP);

	#else
	#ifdef USG_JOBCTRL
	  [black magic incantation for csh hack]

	#else
	/* On a system where suspending is not implemented,
	   instead fork a subshell and let it talk directly to the terminal
	   while we wait.  */

Some System V boxes these days implement BSD job control, and due to
Guy Harris and Dave Lennert's POSIX proposal for implementing BSD job
control on System V there's going to be more in the future.  Line 479
should be changed from

	#ifdef BSD
to
	#ifdef SIGTSTP

which makes it work on System V boxes that support job control like
the HP 9000 Series 800.  Actually, in m-hp9000s800.h you'll need a
couple of lines in addition to the above fix:

	/* BSD's killpg() functionality is subsumed by HP-UX's kill(). */
	#define	killpg(p,s)	kill(-(p), s)

-- bd