[nanomsg] Re: Help with an IPC problem!
- From: Martin Sustrik <sustrik@xxxxxxxxxx>
- To: nanomsg@xxxxxxxxxxxxx
- Date: Thu, 06 Nov 2014 20:14:19 +0100
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Not a bad idea! I'll try to implement that.
Thanks!
Martin
On 06/11/14 19:52, Paul Colomiets wrote:
> Hi Martin,
>
> On Thu, Nov 6, 2014 at 8:42 PM, Martin Sustrik <sustrik@xxxxxxxxxx>
> wrote:
>> What would help is testing (in nn_bind) whether the IPC file is
>> actually used by anybody and if not so, deleting it.
>
> The common pattern is in process doing bind to something like this
> (pseudocode):
>
> if not bind(s, xx) { y = socket(...) if connect(y, xx) { raise
> "Address already in use" } close(y); } unlink(xx) if not bind(s,
> xx) { raise "Race condition: Address already in use" }
>
> I.e. check if you can connect to socket, then it's used. Note,
> hovewer, I'm not sure what happens if old process hangs not doing
> "accept()". Probably result EINPROGRESS for "connect()" should be
> considered successful.
>
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