On 5/07/2014 2:14 PM, Kurt Roeckx wrote:
> On Sat, Jul 05, 2014 at 12:45:37PM -0400, Tim Hudson wrote:
>> If you have SO_REUSEADDR set and a listener already in place you will
>> start a new listener
> No you won't. You will get a bind() error:
> socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) = 3
> setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
> bind(3, {sa_family=AF_INET, sin_port=htons(3344),
> sin_addr=inet_addr("0.0.0.0")}, 16) = -1 EADDRINUSE (Address already in use)
>
> Except on windows it seems.
All the world is not (yet) Linux :-) ... and those semantics were
defined log ago - and evolved ... and there is also REUSEPORT (added
later) and a variety of interpretations - but the base REUSEADDR can
indeed behave that way depending on what platform you are on. Linux has
its own slightly different interpretation. Some google engineering
(search) will show the the variety of confusion that this causes in
cross-platform code.
Tim
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