isatty — test whether a file descriptor refers to a terminal
#include <unistd.h>
int
isatty( |
int fd); |
The isatty() function tests
whether fd is an open
file descriptor referring to a terminal.
isatty() returns 1 if
fd is an open file
descriptor referring to a terminal; otherwise 0 is returned,
and errno is set to indicate the
error.
fd is not a
valid file descriptor.
fd refers to
a file other than a terminal. On some older kernels,
some types of files resulted in the error EINVAL in this case (which is a
violation of POSIX, which specifies the error
ENOTTY).
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
isatty() |
Thread safety | MT-Safe |
This page is part of release 5.11 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright 2008, Linux Foundation, written by Michael Kerrisk <mtk.manpagesgmail.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 Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date.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 |