Thanks, will do.
On Wed, 6 Nov 2019 at 01:51, Santiago Gimeno <santiago.gim...@gmail.com> wrote:
>
> Hi Iñaki,
>
> I don't think there is a way right now though I think it might be implemented
> by extending the uv_udp_send_t structure to hold a "before_send" cb so you
> can set the option, which in turn could bet unset in the send_cb. (extending
> the uv_udp_send_t might be possible by using one entry in the reserved field
> of the uv_req). Of course, this is just an idea which could be bad or simply
> wrong. I would open an issue in the libuv repo to discuss your use case and
> possible solutions.
>
> Cheers,
>
> Santi
>
> El mar., 5 nov. 2019 a las 6:18, Iñaki Baz Castillo (<i...@aliax.net>)
> escribió:
>>
>> Hi, just wondering how to deal with this scenario in which I need to
>> set different DSCP values to UDP packets (actually IP packets) sent on
>> the same uv_udp_t handle.
>>
>> For instance, I send RTP audio and video packets and need to set a
>> specific DSCP/ToS value **just** for audio packets:
>>
>> pseudo-code:
>> -------------------------------------------------
>> int tos = 0x60; // CS3 just for audio packets.
>> uv_os_fd_t fd;
>>
>> // Get the real file descriptor from our libuv UDP handle:
>> uv_fileno((const uv_handle_t*)udpHandle, &fd);
>>
>> // Set ToS/DSCP:
>> if (setsockopt(sock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) {
>> fprintf(stderr,"Error setting TOS: %s\n", strerror(errno));
>> }
>>
>> // Try to send the packet synchronously:
>> uv_udp_try_send(....);
>>
>> // It fails, so send it asynchronously:
>> uv_udp_send(....);
>> --------------------------------------------------
>>
>> This is: before sending each packet I need to call setsockopt() with
>> the corresponding DSCP/ToS value for that packet. However, since I may
>> need to use uv_udp_send() it may happen that, when libuv finally sends
>> the RTP audio packet, the socket DSCP setting may has been modified
>> again due to a new call to setsockopt() for a different packet to be
>> sent.
>>
>> Just wondering if there is a way to tell libuv "please send this
>> socket option for sending this data no matter when such a data is
>> actually sent.
>>
>> Thanks a lot.
>>
>>
>> --
>> Iñaki Baz Castillo
>> <i...@aliax.net>
>>
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Iñaki Baz Castillo
<i...@aliax.net>
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