Standard C Library Functions                           isatty(3C)



NAME
     isatty - test for a terminal device

SYNOPSIS
     #include 

     int isatty(int fildes);


DESCRIPTION
     The isatty() function tests whether  fildes,  an  open  file
     descriptor, is associated with a terminal device.

RETURN VALUES
     The isatty() function returns 1 if fildes is associated with
     a  terminal;  otherwise  it  returns  0 and may set errno to
     indicate the error.

ERORS
     The isatty() function may fail if:

     EBADF     The fildes argument  is  not  a  valid  open  file
               descriptor.


     ENOTY    The fildes argument is not associated with a  ter-
               minal.


USAGE
     The isatty() function does not necessarily indicate  that  a
     human  being  is available for interaction via fildes. It is
     quite possible that non-terminal devices  are  connected  to
     the communications line.

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

















SunOS 5.11          Last change: 24 Jul 2002                    1






Standard C Library Functions                           isatty(3C)



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


SEE ALSO
     ttyname(3C), attributes(5), standards(5)












































SunOS 5.11          Last change: 24 Jul 2002                    2