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Re: winmm.dll error 487 is easily reproducible

On Mar  4 05:09, Andy Koppe wrote:
> On 2 March 2011 13:08, EXCOFFIER Denis wrote:
> > P.S.: By the way, what is the normal way to install snapshots? It is
> > easy to replace cygwin1.dll (keeping around the working one), but in order
> > to test the cygwin1 package in full (eg to check within stdio.h whether
> > vsnprintf is included under __STRICT_ANSI__ or not)?
> You should usually install the cygwin-inst-*.tar.bz2 tarball
> containing all the relevant headers and tools along with the DLL.
> There's a FAQ entry describing how to install it at
> The snapshots page could do with a link to that. However, due to
> Cygwin 1.7's ability to overwrite in-use files, including the Cygwin
> DLL itself, it's no longer necessary to exclude the DLL when
> unpacking, i.e. I find the following works for me:
> - Shut down all Cygwin processes, including background services.
> - Open a Cygwin shell (with administrator rights if Cygwin was
> installed as administrator).
> - cd /
> - tar xvf /path/to/cygwin-inst-*.tar.bz2

Just for the records:

At this point you just have to keep in mind that the old DLL has now
been moved to the trash bin.  Every new process started from here, by
fork or by exec, would load the new DLL.  That would very likely collide
with the memory layout of the old DLL so you're risking a crash.  You're
lucky that the processes up to here don't fork during un-taring...

> - Close shell. that's the only sane thing to do here.

> - Start new shell. Use 'uname -a' to check that you're using the shiny
> new snapshot.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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