[zeromq-dev] Potential bug in select

[Ilya Kulakov]

There are 2 things that make this code look buggy:

1. Behavior of select is undefined if either of sets it owns getting modified
2. Even if it's safe on some platforms, it's still possible to call select with a descriptor which will retire a moment later.
    Moreover, in current implementation fd_set can be modified while being copied via memcpy.
    There should be a lock that will protect data.

Best Regards,
Ilya Kulakov

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