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由 Mark McLoughlin 提交于
If a write() on tapfd returns EAGAIN, return zero so that the packet gets queued (in the case of async send) and enable polling tapfd for writing. When tapfd becomes writable, disable write polling and flush any queued packets. Signed-off-by: NMark McLoughlin <markmc@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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