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-.\" Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\"     <mtk.manpages@gmail.com>
-.\"
-.\" %%%LICENSE_START(VERBATIM)
-.\" Permission is granted to make and distribute verbatim copies of this
-.\" manual provided the copyright notice and this permission notice are
-.\" preserved on all copies.
-.\"
-.\" Permission is granted to copy and distribute modified versions of this
-.\" manual under the conditions for verbatim copying, provided that the
-.\" entire resulting derived work is distributed under the terms of a
-.\" permission notice identical to this one.
-.\"
-.\" Since the Linux kernel and libraries are constantly changing, this
-.\" manual page may be incorrect or out-of-date.  The author(s) assume no
-.\" responsibility for errors or omissions, or for damages resulting from
-.\" the use of the information contained herein.  The author(s) may not
-.\" have taken the same level of care in the production of this manual,
-.\" which is licensed free of charge, as they might when working
-.\" professionally.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
-.\" the source, must acknowledge the copyright and authors of this work.
-.\" %%%LICENSE_END
-.\"
-.TH ISATTY 3 2014-01-27 "Linux" "Linux Programmer's Manual"
-.SH NAME
-isatty \- test whether a file descriptor refers to a terminal
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.sp
-.BI "int isatty(int " fd );
-.fi
-.SH DESCRIPTION
-The
-.BR isatty ()
-function tests whether
-.I fd
-is an open file descriptor referring to a terminal.
-.SH RETURN VALUE
-.BR isatty ()
-returns 1 if
-.I fd
-is an open file descriptor referring to a terminal;
-otherwise 0 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EBADF
-.I fd
-is not a valid file descriptor.
-.TP
-.B EINVAL
-.I fd
-refers to a file other than a terminal.
-POSIX.1-2001 specifies the error
-.BR ENOTTY
-.\" FIXME . File a bug for this?
-for this case.
-.SH ATTRIBUTES
-.SS Multithreading (see pthreads(7))
-The
-.BR isatty ()
-function is thread-safe.
-.SH CONFORMING TO
-SVr4, 4.3BSD, POSIX.1-2001.
-.SH SEE ALSO
-.BR fstat (2),
-.BR ttyname (3)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.