isastream man page on OSF1

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isastream(3)							  isastream(3)

NAME
       isastream - Determine if a file descriptor refers to a STREAMS file

SYNOPSIS
       #include <stropts.h>

       int isastream(
	       int fildes );

LIBRARY
       Standard C Library (libc)

STANDARDS
       Interfaces  documented on this reference page conform to industry stan‐
       dards as follows:

       isastream():  XSH4.2, XSH5.0

       Refer to the standards(5) reference page	 for  more  information	 about
       industry standards and associated tags.

PARAMETERS
       Specifies a file descriptor of an open STREAMS file.

DESCRIPTION
       The  isastream() function tests whether a file descriptor it encounters
       is actually a STREAMS file.

RETURN VALUES
       Upon successful completion, the isastream() function returns a value of
       1  when	the  file descriptor of the open file specified by fildes is a
       STREAMS file, and it returns a value of 0 (zero) if it is not a STREAMS
       file.   Otherwise, a value of -1 is returned, and errno is set to indi‐
       cate the error.

ERRORS
       If any of the following conditions occur, the isastream() function sets
       errno  to  the  corresponding value: The specified file descriptor does
       not refer to a valid open file.

SEE ALSO
       Functions: fattach(3), fdetach(3)

       Interfaces: streamio(7)

       Standards: standards(5)

       Network Programmer's Guide

								  isastream(3)
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