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Re: [COMMITTERS] pgsql: Use symbolic names not octal constants for file permission flags

From: Magnus Hagander <magnus(at)hagander(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [COMMITTERS] pgsql: Use symbolic names not octal constants for file permission flags
Date: 2010-12-11 16:59:18
Message-ID: AANLkTikAPjmQL7ojb+wEW4GS+Sx3hX6=dXtfb2i3zWXm@mail.gmail.com (view raw or flat)
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On Sat, Dec 11, 2010 at 17:55, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Magnus Hagander <magnus(at)hagander(dot)net> writes:
>> On Sat, Dec 11, 2010 at 17:38, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>> No, it isn't.  There's an apparently-useless definition of _S_IRWXU
>>> there, but no S_IRWXU.
>
>> Hmm. You're right, of course.
>
>> A search on my windows box finds the text string S_IRWXU in the
>> following "*.h" files across the whole filesystem:
>> c:\perl\lib\CORE\perl.h
>> c:\perl64\lib\CORE\perl.h
>> c:\pgsql\src\include\pg_config_os.h
>> c:\pgsql\src\include\port\win32.h
>
>> that's it.
>
> OK, now I'm really confused.  We have at least two questions:
>
> 1. How did all those pre-existing references to S_IRXWU compile?

Yeah, that's weird. IIRC (I stopped looking for the moment, need a
step back) some of them were protected by #ifndef WIN32, but not all
of them..


> 2. Why didn't the previously hard-wired constants passed to chmod
> and umask fail on Windows?  The M$ documentation I can find at the
> moment suggests that *only* _S_IREAD and _S_IWRITE bits are allowed
> in the inputs to those functions, which apparently is untrue or none
> of this code would have executed successfully.

Probably it ignores any flags it doesn't know about?

-- 
 Magnus Hagander
 Me: http://www.hagander.net/
 Work: http://www.redpill-linpro.com/

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