Hi Pablo,
On Thu, May 30, 2019 at 01:12:46PM +0200, Pablo Neira Ayuso wrote:
> Check for existing buffer size, if this is larger than the newer buffer
> size, skip this size update.
>
> Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
> ---
> v3: 'len' variable was not properly set.
>
> src/mnl.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/src/mnl.c b/src/mnl.c
> index 288a887df097..2270a084ad29 100644
> --- a/src/mnl.c
> +++ b/src/mnl.c
> @@ -235,8 +235,15 @@ static void mnl_set_sndbuffer(const struct mnl_socket *nl,
>
> static int mnl_set_rcvbuffer(const struct mnl_socket *nl, size_t bufsiz)
> {
> + unsigned int cur_bufsiz;
> + socklen_t len = sizeof(cur_bufsiz);
> int ret;
>
> + ret = getsockopt(mnl_socket_get_fd(nl), SOL_SOCKET, SO_RCVBUF,
> + &cur_bufsiz, &len);
> + if (cur_bufsiz > bufsiz)
> + return 0;
> +
For mnl_set_sndbuffer(), there is simply a global static variable
holding the last set value. Can't we use that here as well? I think of
something like:
+ static unsigned int nlsndbufsiz;
static int mnl_set_rcvbuffer(const struct mnl_socket *nl, size_t bufsiz)
{
+ socklen_t len = sizeof(nlsndbufsiz);
int ret;
+ if (!nlsndbufsiz)
+ ret = getsockopt(mnl_socket_get_fd(nl), SOL_SOCKET, SO_RCVBUF,
+ &nlsndbufsiz, &len);
+ if (nlsndbufsiz >= bufsiz)
+ return 0;
Cheers, Phil
