ISATTY(3)

NAME
       isatty - does this descriptor refer to a terminal

SYNOPSIS
       #include <<unistd.h>>

       int isatty ( int desc );

DESCRIPTION
       returns  1  if  desc  is an open descriptor connected to a
       terminal and 0 else.

CONFORMING TO
       SVID, AT&T, X/OPEN, BSD 4.3

SEE ALSO
       fstat(2) ttyname(3)