Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site umcp-cs.UUCP
Path: utzoo!linus!philabs!cmcl2!seismo!umcp-cs!chris
From: chris@umcp-cs.UUCP (Chris Torek)
Newsgroups: net.unix-wizards
Subject: Re: HELP - Background jobs in csh
Message-ID: <4705@umcp-cs.UUCP>
Date: Wed, 10-Apr-85 17:06:48 EST
Article-I.D.: umcp-cs.4705
Posted: Wed Apr 10 17:06:48 1985
Date-Received: Fri, 12-Apr-85 07:09:00 EST
References: <348@creare.uucp> <175@ucbcad.UUCP>
Organization: U of Maryland, Computer Science Dept., College Park, MD
Lines: 21

To find out whether your program is in the foreground:

	#include <sys/ioctl.h>

	foregroundp()
	{
		int tpgrp;	/* short in 4.1, int in 4.2 */

		if (ioctl(0, TIOCGPGRP, &tpgrp))
			return 0;
		return tpgrp == getpgrp(0);
	}

Unfortunately, the program's status can change between the ioctl
and the getpgrp.  If you don't mind races, the above is sufficient.
If you mind them, then you have to hold SIGTSTP, SIGTTIN, and
SIGTTOU until you know what you're going to do.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 4251)
UUCP:	{seismo,allegra,brl-bmd}!umcp-cs!chris
CSNet:	chris@umcp-cs		ARPA:	chris@maryland