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From: dold@mitisft.Convergent.COM (Clarence Dold)
Newsgroups: comp.unix.wizards
Subject: Re: Getting tty name without using ttyname(3)
Message-ID: <1398@mitisft.Convergent.COM>
Date: 16 Feb 90 00:26:30 GMT
References: <673@compel.UUCP>
Organization: Convergent Technologies, San Jose, CA
Lines: 20

in article <673@compel.UUCP>, her@compel.UUCP (Helge Egelund Rasmussen) says:

> I need to write a replacement for the SYSV release 3 ttyname(3) function.
> As far as I can see by prof'ing a test program, ttyname calls stat(2)
> on the files in /dev until it finds the correct tty (its doing about 300
> stat calls!).

As a first shot, try fstat(0, buf), looking at buf.st_rdev to get your 
minor device number.  Then do a stat of /dev/ttyXXX where XXX is the minor
device number of your tty, and see if buf.st_ino matches.

This only works if the minor device lines up with the port number, but 
it probably does.

If this fails, then call ttyname().
-- 
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Clarence A Dold - dold@tsmiti.Convergent.COM            (408) 435-5293
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