Mailing-List: contact cygwin-help AT sourceware DOT cygnus DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT sources DOT redhat DOT com>
List-Archive: <http://sources.redhat.com/ml/cygwin/>
List-Post: <mailto:cygwin AT sources DOT redhat DOT com>
List-Help: <mailto:cygwin-help AT sources DOT redhat DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender: cygwin-owner AT sources DOT redhat DOT com
Delivered-To: mailing list cygwin AT sources DOT redhat DOT com
Message-ID: <3BCD9A15.4010803@ece.gatech.edu>
Date: Wed, 17 Oct 2001 10:47:49 -0400
From: Charles Wilson <cwilson AT ece DOT gatech DOT edu>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.2) Gecko/20010726 Netscape6/6.1
X-Accept-Language: en-us
MIME-Version: 1.0
To: David <cupcake AT sdf DOT lonestar DOT org>
CC: cygwin AT cygwin DOT com
Subject: Re: cygipc should not include cygipc in sem.h
References: <200110171402 DOT f9HE2sE17587 AT sdf DOT lonestar DOT org>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

David,
   Thanks for the heads up.  Note that "Sun doesn't do it that way" 
isn't a very persuasive argument; "Linux doesn't..." or "SUSv2 says 
that..." is more persuasive.  Fortunately, you got me curious, and 
indeed, SUSv2 agrees with Sun on this issue.

http://www.opengroup.org/onlinepubs/007908799/xsh/semctl.html

Unfortunately, I don't have time to track this down and fix it myself 
right now.  However, I'd be happy to accept a patch...as long as the 
bundled apps were all modified to define semun.  This includes 
ipc-daemon, as well as semtool, shmtool, and msgtool.  And the patch was 
verified to work properly...

--Chuck

David wrote:

> Hello,
> 
> I couldn't find a separate list for cygutils on
> 
> 	http://www.neuro.gatech.edu/users/cwilson/cygutils/index.html
> 
> and I want to point out that including the semum union in sem.h
> makes the package incompatable with sun unix which expects the
> union to be declared in the application program. See below.
> 
> I get compiler errors if I include sem.h in a program which 
> defines the semun union, and I get compilier prototype errors
> if I try to hand semctl anything other than a union with the
> name semun. 
> 
> David
> 
> 
> 
> semctl(2)                 System Calls                  semctl(2)
> 
> NAME
>      semctl - semaphore control operations
> 
> SYNOPSIS
>      #include <sys/types.h>
>      #include <sys/ipc.h>
>      #include <sys/sem.h>
> 
>      int semctl(int semid, int semnum, int cmd, ...);
> 
> DESCRIPTION
>      semctl() provides a variety of semaphore control  operations
>      as  specified  by  cmd.   The  fourth  argument is optional,
>      depending upon the operation requested.  If required  it  is
>      of  type  union  semun, which must be explicitly declared by
>      the application program.
>           union semun {
>                int val;
>                struct semid_ds *buf;
>                ushort *array
>           } _a_r_g;
> 
> SunOS 5.5.1         Last change: 24 Mar 1994                    3
> 
> 
> --
> Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
> Bug reporting:         http://cygwin.com/bugs.html
> Documentation:         http://cygwin.com/docs.html
> FAQ:                   http://cygwin.com/faq/
> 
> 



--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/