hpux man page for isatty

ttyname(3C)															       ttyname(3C)

NAME
       ttyname(), ttyname_r(), isatty() - find name of a terminal

SYNOPSIS
DESCRIPTION
       returns a pointer to a string containing the null-terminated path name of the terminal device associated with file descriptor fildes.

       returns 1 if fildes is associated with a terminal device, 0 otherwise.

   Reentrant Interfaces
       returns the result string in the supplied buffer. The buffer is buflen characters long and should have space for the name and the terminat-
       ing null character. The maximum length of the terminal name is

RETURN VALUE
       returns a NULL pointer if fildes does not describe a terminal device in directory returns a zero upon success  and  an  error  number  upon
       failure.

ERRORS
       and fail if any of the following conditions are encountered:

	      The		  fildes argument is invalid.

	      An inappropriate	  I/O control operation has been attempted.

APPLICATION USAGE
       The return value for points to static data whose content is overwritten by each call.

WARNINGS
       For streams ptys, and do not consider master ptys to be tty devices.  It should also be noted that returns a pointer to the master pty name
       for all master pty devices.  This is a result of device files being linked together.

       Users of should also note that the prototype of this function has changed in this release for conformance with the POSIX.1c  Threads  stan-
       dard.  The old prototype of is supported for compatibility with existing DCE applications only.

FILES
SEE ALSO
       thread_safety(5).

STANDARDS CONFORMANCE
																       ttyname(3C)