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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 dif-
       fer (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 descriptor, 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, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions 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 Stan-
       dard, 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)