isatty(3p) - phpMan

ISATTY(P)                                                            ISATTY(P)



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 asso-
       ciated with a terminal device.

RETURN VALUE
       The isatty() function shall return 1 if fildes is associated with a terminal;  oth-
       erwise, 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 con-
       nected 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 .



POSIX                                2003                            ISATTY(P)

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