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Date:	Thu, 29 Nov 2001 12:41:04 -0500
From:	Charles Wilson <cwilson AT ece DOT gatech DOT edu>
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To:	Horak Daniel <horak AT sit DOT plzen-city DOT cz>
CC:	cygwin AT cygwin DOT com
Subject:	Re: [ANN][RFC] cygipc-1.11 at cygutils
References:	<D5637E9568BDF3499B8BB02C12B4461DD47C AT EXCHANGE DOT mmp DOT plzen-city DOT cz>

Horak Daniel wrote:

>>What does postgresql do if there is no system-wide union semun?
>>
> 
> There is a check for union semun in configure and then if it does not
> find a system wide union semun it defines its own as
> 
> #ifndef HAVE_UNION_SEMUN
> union semun
> {
>         int                     val;
>         struct semid_ds *buf;
>         unsigned short *array;
> };
> #endif


Ah, then cygipc-1.11 won't work for postgresql.  Cygwin (and Linux) 
implementations of IPC need a fourth union memeber,
    struct seminfo *__buf
which is used when cmd == IPC_INFO, SEM_INFO.  Linux also requires a 
fifth member
   void *__pad
while cygipc declares that fifth member because it was modeled on the 
Linux code -- but cygipc never accesses __pad.

This sounds like a vote for 'return to 1.10 behavior'.  Any other comments?

--Chuck



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