Re: What is happening on buildfarm member baiji?

Dave Page <dpage@postgresql.org> writes:
> Stephen Frost wrote:
>> I'm curious as to which Unix systems allow multiple processes to listen
>> on the same port at the same time..  On Linux, and I thought on most,
>> you get an EADDRINUSE on the listen() call (which the postmaster should
>> pick up on and bomb out, which it may already).

> Linux certainly does.

Mmm, you're right, I misread the man page:
    Setting the SO_REUSEADDR option allows the local socket address to be    reused in subsequent calls to bind().
Thispermits multiple    SOCK_STREAM sockets to be bound to the same local address, as long as    all existing sockets
withthe desired local address are in a connected    state before bind() is called for a new socket.
 

The bit about "connected state" is relevant here --- a listening socket
isn't connected.  Time for more caffeine.

> Windows seems to treat SO_REUSEADDR in the same
> way as SO_REUSEPORT which just seems wrong.

Well, Microsoft getting standards wrong is no surprise.  So what do we
want to do about it?
        regards, tom lane