ISATTY
ISATTY
Section: Linux Programmer's Manual (3) Updated: 2008-12-03 Local index
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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.1-2001 specifies the error
ENOTTY
for this case.
CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001.
SEE ALSO
fstat ttyname
COLOPHON
This page is part of release 3.27 of the Linux
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A description of the project,
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can be found at
http://www.kernel.org/doc/man-pages/.
Index
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
SEE ALSO
COLOPHON
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