NAME

isastream − test a file descriptor

SYNOPSIS

#include <stropts.h>

int isastream(int fildes);

MT-LEVEL

MT-Safe

DESCRIPTION

The function isastream() determines if a file descriptor represents a STREAMS file.  fildes refers to an open file descriptor. 

RETURN VALUES

If successful, isastream() returns 1 if fildes represents a STREAMS file, and 0 if not.  On failure, isastream() returns −1 with errno set to indicate an error. 

ERRORS

Under the following conditions, isastream() fails and sets errno to:

EBADF fildes is not a valid file descriptor. 

SEE ALSO

streamio(7I)

STREAMS Programming Guide

SunOS 5.5.1  —  Last change: 17 Jan 1994