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Commits on Oct 30, 2013

  1. linux: don't turn on SO_REUSEPORT socket option 

    On the BSDs, SO_REUSEPORT is pretty much SO_REUSEADDR with some special
casing for IP multicast.  When two processes (that don't do multicast)
bind to the same address, only the last one receives traffic.  It allows
one to "steal" the bound address from another process.  (Both processes
have to enable SO_REUSEPORT though, so it only works in a cooperative
setting.)

On Linux however, it enables port sharing, not stealing - both processes
receive a share of the traffic.  This is a desirable trait but pre-3.9
kernels don't support the socket option and a libuv program therefore
behaves differently with older kernels or on another platform.

This is a back-port of commit 9d60f1e from the master branch.

Fixes nodejs/node-v0.x-archive#6454.
    @bnoordhuis
    bnoordhuis committed Oct 30, 2013
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