Linux 2.6 - man page for isatty (linux section 3posix)
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ISATTY(P) POSIX Programmer's Manual ISATTY(P)
isatty - test for a terminal device
int isatty(int fildes);
The isatty() function shall test whether fildes, an open file descriptor, is associated
with a terminal device.
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.
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.
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.
The Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h>
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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 ISATTY(P)
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