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From: rf@wu1.UUCP
Newsgroups: net.unix-wizards
Subject: Question about ioctl
Message-ID: <247@wu1.UUCP>
Date: Thu, 9-Feb-84 16:11:03 EST
Article-I.D.: wu1.247
Posted: Thu Feb  9 16:11:03 1984
Date-Received: Sun, 12-Feb-84 09:27:21 EST
Organization: Western Union Telegraph, Mahwah, NJ
Lines: 15

On UniSoft v7 Unix there is an ioctl call which works this way:

   int navail;
   . . . 
   ioctl (fildes, FIONREAD, &navail);

This call returns the number of characters which you can read
from fildes in navail.  When fildes refers to a terminal, this
ioctl call returns the number of characters waiting to be read.

*** What versions of Unix will this work under? ***


				Randolph Fritz
				Western Union Telegraph