Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!natinst!sequoia!rpp386!jfh
From: jfh@rpp386.cactus.org (John F. Haugh II)
Newsgroups: comp.unix.wizards
Subject: Re: Getting tty name without using ttyname(3)
Summary: How about higher technology???
Message-ID: <17954@rpp386.cactus.org>
Date: 16 Feb 90 06:12:38 GMT
References: <673@compel.UUCP> <15137:00:09:24@stealth.acf.nyu.edu>
Reply-To: jfh@rpp386.cactus.org (John F. Haugh II)
Organization: Lone Star Cafe and BBS Service
Lines: 20

In article <15137:00:09:24@stealth.acf.nyu.edu> brnstnd@stealth.acf.nyu.edu (Dan Bernstein) writes:
>In article <673@compel.UUCP> her@compel.UUCP (Helge Egelund Rasmussen) writes:
>> I need to write a replacement for the SYSV release 3 ttyname(3) function.
>
>ttyname() takes a file descriptor argument and (as you observed) searches
>through /dev for a tty (or just any file? I haven't checked) referencing
>the same inode. If you have a lot of non-tty entries in /dev, you could
>write a much faster version that only looks at files beginning with tty.
>Of course, to avoid confusion you shouldn't call this ttyname().
>
>Use directory(3), stat(2). (The whole thing is a kludge.)

How about using DBM?  Write a program which takes filenames as arguments
and saves the names away using the device-inode as the index.  To find the
name of your tty you would just make a request of the database.  You could
then feed all of the tty device names to this program at boot-time to
create the index.
-- 
John F. Haugh II                             UUCP: ...!cs.utexas.edu!rpp386!jfh
Ma Bell: (512) 832-8832                           Domain: jfh@rpp386.cactus.org