Re: [Qemu-devel] [PATCH 3/9] runstate: Add runstate store

["Denis V. Lunev" <den-lists@parallels.com>]

On 14/05/15 19:28, Juan Quintela wrote:
> This allows us to store the current state to send it through migration.
>
> Signed-off-by: Juan Quintela <quintela@redhat.com>
> ---
>   include/sysemu/sysemu.h |  1 +
>   vl.c                    | 11 +++++++++++
>   2 files changed, 12 insertions(+)
>
> diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
> index 8a52934..c1a403e 100644
> --- a/include/sysemu/sysemu.h
> +++ b/include/sysemu/sysemu.h
> @@ -28,6 +28,7 @@ bool runstate_check(RunState state);
>   void runstate_set(RunState new_state);
>   int runstate_is_running(void);
>   bool runstate_needs_reset(void);
> +int runstate_store(char *str, int size);
>   typedef struct vm_change_state_entry VMChangeStateEntry;
>   typedef void VMChangeStateHandler(void *opaque, int running, RunState state);
>
> diff --git a/vl.c b/vl.c
> index 15bccc4..7dca13f 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -609,6 +609,17 @@ bool runstate_check(RunState state)
>       return current_run_state == state;
>   }
>
> +int runstate_store(char *str, int size)
> +{
> +    const char *state = RunState_lookup[current_run_state];
> +
> +    if (strlen(state)+1 > size) {
> +        return -1;
> +    }
> +    strncpy(str, state, strlen(state)+1);
> +    return 0;
> +}
> +
>   static void runstate_init(void)
>   {
>       const RunStateTransition *p;
>

minor. why to call strlen() twice?

if you have the length in hand it would be better to call
memcpy to copy data.