STINNER Victor <victor.stin...@gmail.com> added the comment:

It seems like kqueue supports urgent data:

"EV_OOBAND: Read filter on socket may set this flag to indicate the presence of 
out of band data on the descriptor."

Example: 
https://github.com/daurnimator/cqueues/commit/52baaf1c25bc7e6f7cb4685cb05f4ed47a3f404a

Be careful, I also found:

// Older versions of Mac OS X may not define EV_OOBAND.
#if !defined(EV_OOBAND)
# define EV_OOBAND EV_FLAG1
#endif // !defined(EV_OOBAND)

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue30844>
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