returns a string which is the pathname for the current
controlling terminal for this process.
a static buffer is used, otherwise
points to a buffer used to hold the terminal pathname.
The symbolic constant
is the maximum number of characters in the returned pathname.
The pointer to the pathname.
For an explanation of the terms used in this section, see
POSIX.1-2001, POSIX.1-2008, Svr4.
The path returned 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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