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From: rns@se-sd.SanDiego.NCR.COM (Rick Schubert)
Newsgroups: comp.unix.questions
Subject: Re: How to make a tty un'open(2)'able after another process opens it
Keywords: open(2), ioctl(2)
Message-ID: <3878@se-sd.SanDiego.NCR.COM>
Date: 18 Sep 90 15:00:06 GMT
References: <2699@unccvax.uncc.edu>
Organization: NCR Corporation, Systems Engineering - San Diego
Lines: 10

In <2699@unccvax.uncc.edu> cs00chs@unccvax.uncc.edu (charles spell) writes:

>Is there a way (besides lock files) that I can set a /dev/tty* to be
>unopenable by other processes once it is opened by a process? The optimal
>way would be for open() to return -1 if the tty is already being used.

Wouldn't `chmod(0)' do the trick (make sure you change it back when you
are through, though)?

-- Rick Schubert (rns@se-sd.sandiego.NCR.COM)