ctermid - get controlling terminal name
ctermid() returns a string which is the pathname for
the current controlling terminal for this process. If
NULL, a static buffer is used, otherwise
s points to a buffer
used to hold the terminal pathname. The symbolic constant
L_ctermid is the maximum number of characters in the
The pointer to the pathname.
POSIX.1-2001, POSIX.1-2008, Svr4.
The returned pathname may not uniquely identify the controlling
terminal; it may, for example, be
It is not assured that the program can open the terminal.
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