Is it possible to read how many bytes has buffered in a udp socket buffer in Linux c++?

Question

Is it possible to read how many bytes has buffered in a udp socket buffer in Linux using c++? unfortunately FIONREAD couldn't do that under linux.

related: http://stackoverflow.com/q/2289830/951890 – Vaughn Cato Apr 20 '13 at 13:43 — Vaughn Cato, Apr 20 '13 at 13:43
@Vaughn interesting, thank you. – Bryan Fok Apr 20 '13 at 13:50 — Bryan Fok, Apr 20 '13 at 13:50

score 1 · Answer 1 · answered Apr 20 '13 at 14:02

Sort of. You can get the number of bytes available for the current datagram. When you call recvfrom pass it the MSG_PEEK flag. This will leave the datagram intact but allow you to look at the data and get how many bytes are available.

recvfrom(socket, buffer, size, MSG_PEEK, &address, &address_len);

score 1 · Answer 2 · answered Apr 20 '13 at 14:27

1

If you're using recv or recvfrom this would be accomplished by setting flags to MSG_PEEK.

If you are using another method of reading from sockets, let me know and I'll see what I can find.

answered Apr 20 '13 at 14:27

fredrik

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Is it possible to read how many bytes has buffered in a udp socket buffer in Linux c++?

2 Answers2