standards/107561: Missing SUS function tcgetsid()

[Jukka A. Ukkonen]

Quoting Oliver Fromme:
> 
> In fact, tcgetsid() is part of IEEE Std 1003.1-2001 a.k.a.
> POSIX-2001, which is equivalent to SUSv3.

	Oops! I did not notice that.

> The proposed implementation looks good to me (we would
> also need an appropriate manual page, though).

	Right, I will try to remember to provide also a manual page
	some time in not so distant future.


	Cheers,
		// jau
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