[nanomsg] Re: nn_recv with padding
- From: Martin Sustrik <sustrik@xxxxxxxxxx>
- To: nanomsg@xxxxxxxxxxxxx
- Date: Mon, 12 May 2014 13:15:09 +0200
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On 12/05/14 13:10, Drew Crawford wrote:
> I’m not completely sure I’ve expressed my problem intelligibly, but
> my goal is to produce a zero-copy contiguous array of (let’s say)
> messageSize + 16, with the extra bytes leading or trailing as
> desired.
>
> As far as I comprehend the documentation, nn_recvmsg allows me to
> receive data into a *non*contiguous array. But I don’t know how to
> use it to produce a contiguous array of messageSize + 16.
The idea is (in pseudocode):
const char *padding = "PADDING"
void *buf;
nn_recv (s, &buf, NN_MSG, 0);
iovec iov[2];
iov[0].iov_base = &buf;
iov[0].iov_len = NN_MSG;
iov[1].iov_base = padding;
iov[1].iov_len = 7;
nn_sendmsg (s2, iov, 0);
Martin
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