redhat man page for isatty

ISATTY(3)						     Linux Programmer's Manual							 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)

Linux								    1995-04-20								 ISATTY(3)