Re: [Qemu-devel] [PATCH, v2] Introduce --enable-binfmt-misc configure option

["andrzej zaborowski" <balrogg@gmail.com>]

2008/11/1 Kirill A. Shutemov <kirill@shutemov.name>:
> It makes qemu compatible with binfmt_misc's flags 'P' and 'O'.
>
> 'P' - preserve-argv[0].  Legacy behavior of binfmt_misc is to overwrite the
>      original argv[0] with the full path to the binary.  When this flag is
>      included, binfmt_misc will add an argument to the argument vector for
>      this purpose, thus preserving the original argv[0].
>
> 'O' - open-binary. Legacy behavior of binfmt_misc is to pass the full path
>      of the binary to the interpreter as an argument. When this flag is
>      included, binfmt_misc will open the file for reading and pass its
>      descriptor as an argument, instead of the full path, thus allowing
>      the interpreter to execute non-readable binaries.
>
> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
> ---
>  configure              |   86 ++++++++++++++++++++++++++----------------------
>  linux-user/linuxload.c |    7 +---
>  linux-user/main.c      |   39 ++++++++++++++++++++-
>  linux-user/qemu.h      |    2 +-
>  4 files changed, 87 insertions(+), 47 deletions(-)
>
> diff --git a/configure b/configure
> index ccc4ae0..c7e2732 100755
> --- a/configure
> +++ b/configure
> @@ -114,6 +114,7 @@ aio="yes"
>  nptl="yes"
>  mixemu="no"
>  bluez="yes"
> +binfmt_misc="no"
>
>  # OS specific
>  targetos=`uname -s`
> @@ -355,6 +356,8 @@ for opt do
>   ;;
>   --disable-aio) aio="no"
>   ;;
> +  --enable-binfmt-misc) binfmt_misc="yes"
> +  ;;

I don't know what binfmt-misc is good for, but there's nothing in the
new code that must be done in compile time, I think the #ifdef could
just be an if ().