Accept connections even when syncookies are disabled. #8
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A backlog of zero only makes sense when syncookies are enabled.
This unlink call is redundant with the one occurring in tcp_bind, which is the first thing done by tcp_listen_nonblock, which is called before the existence of socketfile may impact anything.
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The backlog argument of listen() should not be zero when syncookies are disabled (since Linux 2.2).