Re: [Xen-devel] [PATCH 7/7] libxl: fork: Provide LIBXL_HAVE_SIGCHLD_SELECTIVE_REAP

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-01-16 at 17:22 +0000, Ian Jackson wrote:
> This is the feature test macro for libxl_childproc_sigchld_occurred
> and libxl_sigchld_owner_libxl_always_selective_reap.
> 
> It is split out into this separate patch because: a single feature
> test is sensible because we do not intend anyone to release or ship
> libxl versions with one of these but not the other; but, the two
> features are in separate patches for clarity; and, this just makes
> reading the actual code easier.
> 
> Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
> Cc: Jim Fehlig <jfehlig@xxxxxxxx>

Acked-by: Ian Campbell <Ian.Campbell@xxxxxxxxxx>

> ---
>  tools/libxl/libxl.h |   13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
> index 12d6c31..1ac34c3 100644
> --- a/tools/libxl/libxl.h
> +++ b/tools/libxl/libxl.h
> @@ -409,6 +409,19 @@
>   */
>  #define LIBXL_HAVE_DRIVER_DOMAIN_CREATION 1
>  
> +/*
> + * LIBXL_HAVE_SIGCHLD_SELECTIVE_REAP
> + *
> + * If this is defined:
> + *
> + * Firstly, the enum libxl_sigchld_owner (in libxl_event.h) has the
> + * value libxl_sigchld_owner_libxl_always_selective_reap which may be
> + * passed to libxl_childproc_setmode in hooks->chldmode.
> + *
> + * Secondly, the function libxl_childproc_sigchld_occurred exists.
> + */
> +#define LIBXL_HAVE_SIGCHLD_OWNER_SELECTIVE_REAP 1
> +
>  /* Functions annotated with LIBXL_EXTERNAL_CALLERS_ONLY may not be
>   * called from within libxl itself. Callers outside libxl, who
>   * do not #include libxl_internal.h, are fine. */



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