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[Ada] socket fixes

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Thomas Quinot <quinot at adacore dot com>
Date: Tue, 31 Oct 2006 20:49:29 +0100
Subject: [Ada] socket fixes

Tested on i686-linux, committed on trunk.

This change adds a reset of the signalling socket descriptors in a selector
when the selector is closed. This ensures that any operation on a closed
selector will properly fail, rather than give unexpected behaviour.

2006-10-31  Thomas Quinot  <quinot@adacore.com>

	* g-socket.ads, g-socket.adb (Close_Selector): Once the signalling
	sockets are closed, reset the R_Sig_Socket and W_Sig_Socket components
	to No_Socket.
	(Selector_Type): Add default value of No_Socket for R_Sig_Socket and
	W_Sig_Socket.

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