Re: [PATCH 3/3] tools/libxl: run_helper - add #define for arguments.

[Ian Campbell <ian.campbell@citrix.com>]

On Mon, 2016-01-25 at 16:06 -0500, Konrad Rzeszutek Wilk wrote:
> Describe what the four (or more in the future) arguments
> are for.

I'd say that a code comment on the definition would be sufficient here, but
I'll defer to Ian J as author of this code.

> 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> ---
>  tools/libxl/libxl_save_callout.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/libxl/libxl_save_callout.c
> b/tools/libxl/libxl_save_callout.c
> index 3af99af..45b9727 100644
> --- a/tools/libxl/libxl_save_callout.c
> +++ b/tools/libxl/libxl_save_callout.c
> @@ -119,13 +119,22 @@ void
> libxl__save_helper_init(libxl__save_helper_state *shs)
>  
>  /*----- helper execution -----*/
>  
> +/*
> + * Both save and restore share four parameters:
> + * 1) Path to libxl-save-helper.
> + * 2) --[restore|save]-domain.
> + * 3) stream file descriptor.
> + * n) save/restore specific parameters.
> + * 4) A \0 at the end.
> + */
> +#define HELPER_NR_ARGS 4
>  static void run_helper(libxl__egc *egc, libxl__save_helper_state *shs,
>                         const char *mode_arg, int stream_fd,
>                         const int *preserve_fds, int num_preserve_fds,
>                         const unsigned long *argnums, int num_argnums)
>  {
>      STATE_AO_GC(shs->ao);
> -    const char *args[4 + num_argnums];
> +    const char *args[HELPER_NR_ARGS + num_argnums];
>      const char **arg = args;
>      int i, rc;
>  

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