You can use the ctermid
function to get a file name that you can
use to open the controlling terminal. In the GNU library, it returns
the same string all the time: "/dev/tty"
. That is a special
"magic" file name that refers to the controlling terminal of the
current process (if it has one). To find the name of the specific
terminal device, use ttyname
; see section Identifying Terminals.
The function ctermid
is declared in the header file
`stdio.h'.
ctermid
function returns a string containing the file name of
the controlling terminal for the current process. If string is
not a null pointer, it should be an array that can hold at least
L_ctermid
characters; the string is returned in this array.
Otherwise, a pointer to a string in a static area is returned, which
might get overwritten on subsequent calls to this function.
An empty string is returned if the file name cannot be determined for any reason. Even if a file name is returned, access to the file it represents is not guaranteed.
ctermid
.
See also the isatty
and ttyname
functions, in
section Identifying Terminals.
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