isatty(3C) Standard C Library Functions isatty(3C)
NAME
isatty - test for a terminal device
SYNOPSIS
#include <unistd.h>
int isatty(int fildes);
DESCRIPTION
The isatty() function tests whether fildes, an open file descriptor, is associated with a terminal device.
RETURN VALUES
The isatty() function returns 1 if fildes is associated with a terminal; otherwise it returns 0 and may set errno to indicate the error.
ERRORS
The isatty() function may fail if:
EBADF The fildes argument is not a valid open file descriptor.
ENOTTY The fildes argument is not associated with a terminal.
USAGE
The isatty() function does not necessarily indicate that a human being is available for interaction via fildes. It is quite possible that
non-terminal devices are connected to the communications line.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
ttyname(3C), attributes(5), standards(5)
SunOS 5.11 24 Jul 2002 isatty(3C)