[lttng-dev] [RFC PATCH lttng-tools 16/18] Add serialized versions of lttng_event structs

[mathieu.desnoyers@efficios.com (Mathieu Desnoyers)]

----- On Apr 18, 2019, at 12:18 PM, Yannick Lamarre ylamarre at efficios.com wrote:

> Serialized version of lttng_snapshot_output is a packed structure to be
> used in communication protocols for consistent size across platforms.
> The serialized version is stripped of pointers and padding.
> 
> Pointers are removed since their size can vary on platforms supporting
> variable sized registers (x86-64).
> Padding is also removed since it defeats the purpose of a packed struct.

Same questions about explanation of "variable sized registers" and how
we extend without padding as prior commits.

Thanks,

Mathieu

> 
> Signed-off-by: Yannick Lamarre <ylamarre at efficios.com>
> ---
> include/lttng/snapshot-internal.h | 8 ++++++++
> 1 file changed, 8 insertions(+)
> 
> diff --git a/include/lttng/snapshot-internal.h
> b/include/lttng/snapshot-internal.h
> index b7391c22..bf9dfbe4 100644
> --- a/include/lttng/snapshot-internal.h
> +++ b/include/lttng/snapshot-internal.h
> @@ -45,6 +45,14 @@ struct lttng_snapshot_output {
> 	char data_url[PATH_MAX];
> };
> 
> +struct lttng_snapshot_output_serialized {
> +	uint32_t id;
> +	uint64_t max_size;
> +	char name[LTTNG_NAME_MAX];
> +	char ctrl_url[PATH_MAX];
> +	char data_url[PATH_MAX];
> +} LTTNG_PACKED;
> +
> /*
>  * Snapshot output list object opaque to the user.
>  */
> --
> 2.11.0
> 
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-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com