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From: jon@eps2.UUCP
Newsgroups: comp.unix.questions
Subject: Re: A couple questions
Message-ID: <80@eps2.UUCP>
Date: Wed, 15-Apr-87 02:21:00 EST
Article-I.D.: eps2.80
Posted: Wed Apr 15 02:21:00 1987
Date-Received: Fri, 17-Apr-87 00:15:37 EST
References: <3164@jade.BERKELEY.EDU> <1296@decuac.DEC.COM>
Organization: Scumtronics Inc.
Lines: 17
Summary: _exit(), not exit()

In article <1296@decuac.DEC.COM>, avolio@gildor.dec.com (Frederick M. Avolio) writes:
>        if ((pid = fork()) == 0)		/* IF CHILD */
> 		{	
>                 execl("/bin/sh", "sh", "-c", arg, 0);
> 		printf("HELP! SOMEONE STOLE THE SHELL!\n");
> 		exit(1);

Use _exit() in this instance instead of exit() because there is the
possibility of flushing the stdio buffers twice, once in the child and
once in the parent, which wouldn't really be right.  You might see some
output twice.  I would probably use an fputs to stderr here, to avoid
buffering.  This was probably just an oversight on Frederick's followup.
To really confuse people running ps, replace "sh" with a clever saying in
double quotes.


Jonathan Hue	DuPont Design Technologies/Via Visuals		leadsv!eps2!jon