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Message-ID: <5530EEA2.6000903@dronecode.org.uk>
Date: Fri, 17 Apr 2015 12:29:38 +0100
From: Jon TURNEY <jon DOT turney AT dronecode DOT org DOT uk>
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To: cygwin AT cygwin DOT com
Subject: Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 2.0.0-5
References: <announce DOT 20150415160254 DOT GF7343 AT calimero DOT vinschen DOT de> <CAK-n8j6MpTscHoOCmzkrrTHAxtzL4XuV5TY-x5f-S6mJ8WQk5A AT mail DOT gmail DOT com> <20150416162146 DOT GD3657 AT calimero DOT vinschen DOT de>
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On 16/04/2015 17:21, Corinna Vinschen wrote:
> Btw., it would be nice to know why XWin tries to chown a file.
> Jon?

This seems to be in trans_mkdir() in libxtrans [1], which tries to make 
sure that /tmp/.X11-unix (the directory in which the server's 
unix-domain sockets are created) is owned by uid 0, gid 0.

[1] http://cgit.freedesktop.org/xorg/lib/libxtrans/tree/Xtransutil.c#n591

> $ gdb XWin
> [...]
> Reading symbols from XWin...Reading symbols from /usr/lib/debug//usr/bin/XWin.exe.dbg...done.
> done.
> (gdb) b fchown
> Breakpoint 1 at 0x10057aa80
> (gdb) r
> Starting program: /usr/bin/XWin
> Breakpoint 1, 0x000000010057aa80 in fchown ()
> (gdb) bt
> #0  0x000000010057aa80 in fchown ()
> #1  0x0000000100573bac in trans_mkdir (mode=1023, path=0x1005b47c8 <__func__.16196+2499> "/tmp/.X11-unix") at /usr/include/X11/Xtrans/Xtransutil.c:591
> [...]


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