Standard C Library Functions                        isastream(3C)



NAME
     isastream - test a file descriptor

SYNOPSIS
     #include 

     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.

ERORS
     The isastream() function will fail if:

     EBADF    The fildes argument is not a valid file descriptor.


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



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          Standard                    
    
     MT-Level                     MT-Safe                     
    


SEE ALSO
     attributes(5), , standards(5), streamio(7I)


     STREAMS Programming Guide










SunOS 5.11          Last change: 24 Jul 2002                    1