isastream(3C)

NAME

     isastream - test a file descriptor

SYNOPSIS

     #include <stropts.h>

     int isastream(int fildes);

DESCRIPTION

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

RETURN VALUES

     Upon successful completion, isastream() returns 1 if  fildes
     represents a STREAMS file, and 0 if it does not.  Otherwise,
     -1 is return and errno is set to indicate the error.

ERRORS

     The isastream() function will fail if:

     EBADF The fildes argument is not a valid file descriptor.

ATTRIBUTES

     See attributes(5) for descriptions of the  following  attri-
     butes:

     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | MT-Level                    | MT-Safe                     |
    |_____________________________|_____________________________|

SEE ALSO

     attributes(5), streamio(7I)

     STREAMS Programming Guide