Re: [Qemu-devel] [PATCH] linux-user: add binfmt wrapper for argv[0] handling

[Riku Voipio <riku.voipio@iki.fi>]

On Sat, Oct 29, 2011 at 08:08:39PM +0200, Alexander Graf wrote:
> > When using qemu's linux-user binaries through binfmt, argv[0] gets lost
> > along the execution because qemu only gets passed in the full file name
> > to the executable while argv[0] can be something completely different.
> > 
> > This breaks in some subtile situations, such as the grep and make test
> > suites.
> > 
> > This patch adds a wrapper binary called qemu-$TARGET-binfmt that can be
> > used with binfmt's P flag which passes the full path _and_ argv[0] to
> > the binfmt handler.
> > 
> > The binary would be smart enough to be versatile and only exist in the
> > system once, creating the qemu binary path names from its own argv[0].
> > However, this seemed like it didn't fit the make system too well, so
> > we're currently creating a new binary for each target archictecture.
> > 
> > CC: Reinhard Max <max@suse.de>
> > Signed-off-by: Alexander Graf <agraf@suse.de>
 
> Ping?

Last time a wrapper for binfmt was suggested on this list, it was shot down
since people didn't want to add extra binary to the chroot. But your point
is valid, without proper argv[0] things break sometimes. For the same reason
scratchbox has a wrapper binary instead of calling qemu directly...

Riku