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.
SVr4, 4.3BSD, POSIX.1-2001.
SEE ALSO¶
fstat(2),
ttyname(3)
COLOPHON¶
This page is part of release 3.44 of the Linux
man-pages project. A
description of the project, and information about reporting bugs, can be found
at
http://www.kernel.org/doc/man-pages/.
