NAME    [Toc]    [Back]

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

SYNOPSIS    [Toc]    [Back]

       #include <stropts.h>

       int isastream(
               int fildes );

LIBRARY    [Toc]    [Back]

       Standard C Library (libc)

STANDARDS    [Toc]    [Back]

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

       isastream():  XSH4.2, XSH5.0

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

PARAMETERS    [Toc]    [Back]

       Specifies a file descriptor of an open STREAMS file.

DESCRIPTION    [Toc]    [Back]

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

RETURN VALUES    [Toc]    [Back]

       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    [Toc]    [Back]

       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    [Toc]    [Back]

       Functions: fattach(3), fdetach(3)

       Interfaces: streamio(7)

       Standards: standards(5)

       Network Programmer's Guide



                                                     isastream(3)