Date: Fri, 2 Mar 2007 13:46:17 -0500 (EST)
From: Igor Peshansky <pechtcha@cs.nyu.edu>
Reply-To: cygwin@cygwin.com
To: Charles Wilson <cygwin@cwilson.fastmail.fm>
cc: cygwin@cygwin.com
Subject: Re: Difference Between CYGIPC And CYGServer
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On Fri, 2 Mar 2007, Charles Wilson wrote:

> neo napster wrote:
> > I have a few queries regarding cygserver and cygipc. what will be the
> > impact to move from cygipc to cygserver? I have some systems programs
> > which make calls to the CYGIPC, since these programs are coded long
> > back.
> >
> > Can you please give us an idea of the things that need to be done to
> > move from cygipc to cygserver. Our programs are coded in C.
>
> Both provide (some) of the standard IPC calls.  Both cygipc and
> cygserver implement the BSD interfaces for shared memory, semaphores,
> and message queues. (In cygwin-1.7.0+, cygserver will also implement
> POSIX-compliant shared memory objects and message queues).
>
> cygipc is practically unmaintained -- and the code quality is, er, less
> than ideal.  cygserver is actively maintained and coded to a much higher
> standard.
>
> Since both, today, implement the same BSD-derived interface[see (4),
> below], to move from one to the other, you should simply
>
> (1) stop using -I/usr/include/cygipc in your build
> (1) stop using -lcygipc2 in your build
> (3) don't run ipc-daemon2.exe; instead, run /usr/bin/cygserver-config
> and follow the instructions.
> (4) remove calls to
>       cygipc_set_err_handler
>       cygipc_get_err_handler
>       cygipc_set_debug
>       cygipc_get_debug
>       cygipc_tracing_enabled
>    cygserver uses Win32 event logging for error and debug handling, so
>    these hacks provided by cygipc are unnecessary.

It seems that this information (verbatim) would be very useful in
cygserver.README (or some other document in /usr/share/doc/cygserver).
	Igor
-- 
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