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-'\" t
-.\" Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\" <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH isatty 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-isatty \- test whether a file descriptor refers to a terminal
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.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 ENOTTY
-.I fd
-refers to a file other than a terminal.
-On some older kernels, some types of files
-.\" e.g., FIFOs and pipes on 2.6.32
-resulted in the error
-.B EINVAL
-in this case (which is a violation of POSIX, which specifies the error
-.BR ENOTTY ).
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR isatty ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, SVr4, 4.3BSD.
-.SH SEE ALSO
-.BR fstat (2),
-.BR ttyname (3)