[lttng-dev] [PATCH lttng-tools v2] Fix: Use SOL_SOCKET level for SO_KEEPALIVE on all platform

[Jérémie Galarneau]

Merged in master, stable-2.10, and stable-2.9.

Thanks!
Jérémie

On Wed, Feb 21, 2018 at 04:59:54PM -0500, Jonathan Rajotte wrote:
> On Linux, COMPAT_SOCKET_LEVEL was set to SOL_TCP instead
> of SOL_SOCKET, this resulted in execution of:
>     setsockopt(..., SOL_TCP, TCP_DEFER_ACCEPT, ...)
> 
> Instead of:
>     setsockopt(..., SOL_SOCKET, SO_KEEPALIVE, ...)
> 
> Hence, TCP keep alive was not enabled.
> 
> COMPAT_SOCKET_LEVEL is not needed. All platforms supported use the
> SOL_SOCKET level for SO_KEEPALIVE.
> 
> Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien at efficios.com>
> ---
>  src/bin/lttng-relayd/tcp_keep_alive.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/src/bin/lttng-relayd/tcp_keep_alive.c b/src/bin/lttng-relayd/tcp_keep_alive.c
> index 4a2cd9f..469bec3 100644
> --- a/src/bin/lttng-relayd/tcp_keep_alive.c
> +++ b/src/bin/lttng-relayd/tcp_keep_alive.c
> @@ -36,7 +36,6 @@
>  /* Per-platform definitions of TCP socket options. */
>  #if defined (__linux__)
>  
> -#define COMPAT_SOCKET_LEVEL SOL_TCP
>  #define COMPAT_TCP_LEVEL SOL_TCP
>  #define COMPAT_TCP_ABORT_THRESHOLD 0 /* Does not exist on linux. */
>  #define COMPAT_TCP_KEEPIDLE TCP_KEEPIDLE
> @@ -45,7 +44,6 @@
>  
>  #elif defined (__sun__) /* ! defined (__linux__) */
>  
> -#define COMPAT_SOCKET_LEVEL SOL_SOCKET
>  #define COMPAT_TCP_LEVEL IPPROTO_TCP
>  
>  #ifdef TCP_KEEPALIVE_THRESHOLD
> @@ -65,7 +63,6 @@
>  
>  #else /* ! defined (__linux__) && ! defined (__sun__) */
>  
> -#define COMPAT_SOCKET_LEVEL 0
>  #define COMPAT_TCP_LEVEL 0
>  #define COMPAT_TCP_ABORT_THRESHOLD 0
>  #define COMPAT_TCP_KEEPIDLE 0
> @@ -547,7 +544,7 @@ int socket_apply_keep_alive_config(int socket_fd)
>  		goto end;
>  	}
>  
> -	ret = setsockopt(socket_fd, COMPAT_SOCKET_LEVEL, SO_KEEPALIVE, &val,
> +	ret = setsockopt(socket_fd, SOL_SOCKET, SO_KEEPALIVE, &val,
>  			sizeof(val));
>  	if (ret < 0) {
>  		PERROR("setsockopt so_keepalive");
> -- 
> 2.7.4
>