The
ctermid ();
function generates a string, that, when used as a pathname, refers to
the current controlling terminal of the calling process.
If
Fa buf
is the
NULL
pointer, a pointer to a static area is returned.
Otherwise, the pathname is copied into the memory referenced by
Fa buf .
The argument
Fa buf
is assumed to be at least
L_ctermid
(as defined in the include
file
In stdio.h )
bytes long.
The
ctermid_r ();
function
provides the same functionality as
ctermid ();
except that if
Fa buf
is a
NULL
pointer,
NULL
is returned.
The current implementation simply returns
`/dev/tty'
RETURN VALUES
Upon successful completion, a
non- NULL
pointer is returned.
Otherwise, a
NULL
pointer is returned and the global variable
errno
is set to indicate the error.
ERRORS
The current implementation detects no error conditions.
