It's a similar story with SYN+data+FIN to provide a basic reliable
datagram. You can't rely on a consistent implementation (unless it's to
defeat your purpose).

On 5 February 2017 at 15:51, Charles Forsyth <>

> On 5 February 2017 at 05:23, Bakul Shah <> wrote:
>> I think shutdown(sock, SHU_RD) is mainly to let the sender generate an
>> SIGPIPE signal in case it has sent data on a closed direction of a
>> connection. But I think this is only for completeness. Almost always you’d
>> use close(sock). At least I have not found a usecase when I’d want to
>> shutdown the read-end but continue sending on write-end.
> Yes. That's roughly what I tried to do with my network pipe, but at least
> at the time, target systems differed (as they were apparently allowed) as
> to whether they reliably delivered data or simply flushed it, so in the end
> I had to add some protocol to ensure it, and didn't need the "feature".

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