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由 antirez 提交于
Fdset target is used when we want to write an RDB file directly to slave's sockets. In this setup as long as there is a single slave that is still receiving our payload, we want to continue sennding instead of aborting. However rio calls should abort of no FD is ok. Also we want the errors reported so that we can signal the parent who is ok and who is broken, so there is a new set integers with the state of each fd. Zero is ok, non-zero is the errno of the failure, if avaialble, or a generic EIO.
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