NAME¶
isatty - test whether a file descriptor refers to a terminal
SYNOPSIS¶
#include <unistd.h>
int isatty(int fd);
DESCRIPTION¶
The isatty() function tests whether fd is an open file descriptor
referring to a terminal.
RETURN VALUE¶
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.
ERRORS¶
- EBADF
- fd is not a valid file descriptor.
- EINVAL
- fd refers to a file other than a terminal. POSIX.1 specifies the
error ENOTTY for this case.
ATTRIBUTES¶
For an explanation of the terms used in this section, see attributes(7).
Interface |
Attribute |
Value |
isatty () |
Thread safety |
MT-Safe |
POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD.
COLOPHON¶
This page is part of release 4.10 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/.