Question about ioctl

[rf at wu1.UUCP]

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