Re: [Qemu-devel] [PATCH RFC] Do not set SO_REUSEADDR on Windows

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2013-09-04 16:27, Paolo Bonzini wrote:
> Il 04/09/2013 16:22, Sebastian Ottlik ha scritto:
>> This patchset disabels all use of SO_REUSEADDR on Windows. On Windows systems
>> the default behavior is equivalent to SO_REUSEADDR on other operating
>> systems. SO_REUSEADDR can still be set but results in undesired bahvior
>> instead. It may even lead to situations were system behavior is
>> unspecified. More information on this can be found at:
>> http://msdn.microsoft.com/en-us/library/windows/desktop/ms740621.aspx
>>
>> I originally encountered this issue when accidentally launching two QEMU
>> instances with identical GDB ports at the same time. In which case QEMU won't
>> fail as one might expect. I am sending this as RFC as I A) only checked that
>> this fixes issues for the GDB server and B) am not sure if this is the correct
>> format for this patchset.
>>
>> gdbstub: do not set SO_REUSEADDR on Windows
>> net: do not set SO_REUSEADDR on Windows
>> slirp: do not set SO_REUSEADDR on Windows
>> util: do not set SO_REUSEADDR on Windows
> 
> Makes sense.
> 
> Can you make a different patch that introduces a new function
> qemu_set_reuseaddr is include/qemu/sockets.h & util/oslib-*, and makes
> it a stub for Windows?
> 
> This way we don't have a proliferation of #ifs.

Yeah, this is definitely better then. IIRC, Michael has some version of
patch 3 in his queue right now - should be dropped in this light.

Jan

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