osf1 man page for isastream

isastream(3)						     Library Functions Manual						      isastream(3)

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

LIBRARY
       Standard C Library (libc.so, libc.a)

SYNOPSIS
       #include <stropts.h>
       int isastream(	   int fildes);

STANDARDS
       Interfaces documented on this reference page conform to industry standards as follows:

       isastream():  XPG4-UNIX

       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
       indicate 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.

RELATED INFORMATION
       Functions: fattach(3), fdetach(3)

       Interfaces: streamio(7)

       Standards: standards(5) delim off

																      isastream(3)