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ISATTY(3P)                 POSIX Programmer's Manual                ISATTY(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
NAME
       isatty - test for a terminal device
SYNOPSIS
       #include <unistd.h>
       int isatty(int fildes);

DESCRIPTION
       The isatty() function shall test whether fildes, an open file  descrip-
       tor, is associated with a terminal device.
RETURN VALUE
       The  isatty()  function  shall  return 1 if fildes is associated with a
       terminal; otherwise, it shall return 0 and may set  errno  to  indicate
       the error.
ERRORS
       The isatty() function may fail if:
       EBADF  The fildes argument is not a valid open file descriptor.
       ENOTTY The fildes argument is not associated with a terminal.

       The following sections are informative.
EXAMPLES
       None.
APPLICATION 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.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       The Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained  online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                  2003                           ISATTY(3P)