PXFISATTY (L*X, M*X)

POSIX Subroutine: Tests whether a file descriptor is connected to a terminal.

Module

USE IFPOSIX

CALL PXFISATTY (ifildes,isatty,ierror)

ifildes	(Input) INTEGER(4). The file descriptor.
isatty	(Output) LOGICAL(4). The returned value.
ierror	(Output) INTEGER(4). The error status.

If successful, ierror is set to zero; otherwise, an error code.

If file descriptor ifildes is open and connected to a terminal, isatty returns .TRUE.; otherwise, .FALSE..