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Date: Fri, 8 Mar 2019 23:46:38 +0900
From: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
To: cygwin AT cygwin DOT com
Subject: Re: Logging-in using ssh elevates the user privilege.
Message-Id: <20190308234638.0ada919bc31803cf064ca720@nifty.ne.jp>
In-Reply-To: <20190308141118.GM3785@calimero.vinschen.de>
References: <20190307010000 DOT fc28b73739c2dd66e609982b AT nifty DOT ne DOT jp>	<381052629 DOT 20190307141955 AT yandex DOT ru>	<51233666 DOT 20190307182445 AT yandex DOT ru>	<20190308230138 DOT b7f6b5ac90c9a14cde2647c1 AT nifty DOT ne DOT jp>	<20190308141118 DOT GM3785 AT calimero DOT vinschen DOT de>
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Hi Corinna,

Thanks for your advice.

On Fri, 8 Mar 2019 15:11:18 +0100 Corinna Vinschen wrote:
> > In Linux, connect() in the client returns befor the
> > server calls accept(). However, in cygwin, connect()
> > does not return until the server calls accept().
> 
> This is a result of the handshake to exchange credentials for
> getpeereid().  To workaround this issue, try building screen
> with a tweak.  Server and as client should call
> 
>   setsockopt (sock, SOL_SOCKET, SO_PEERCRED, NULL, 0);
> 
> before calling accept or connect.

Following your advice, I tried the patch attached and
confirmed the problem regarding -Q option is solved.

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

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