Check the $except arg in stream_select about reactphp HOT 4 CLOSED

It is important to note that not all architectures report errors via $except, some will only report out-of-band data.

If a socket appears in $except, one also needs to check whether it appears in $read and whether it is feof() before one can reasonably determine what to do with it, and whether it represents an error condition or not.

On Windows if a packet is received with the RST bit set or if a send operation times out, the socket will appear in $except. I also tested this on Fedora last night, and there that is not the case - it only appears in $read when an RST is received (and feof() is true), and it doesn't appear anywhere when a send operation times out, but feof() returns true.

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This will most likely result in some additions to the LoopInterface. We need to ensure that libev and libevent support it properly.

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ext-libevent has a EV_TIMEOUT constant that can be used for event_add. Not sure about libev yet.

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Closing this due to a lack of feedback, as we can not reproduce any issues here. If anybody happens to to be able to reproduce this, please come back with more details and we can reopen this 👍

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