Only for UNIX OS, modify it to enable O_NONBLOCK and use event::read().
#920
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Related issue is #854.
Primarily observed during mouse operations on macOS, it seems that if
O_NONBLOCKis not enabled duringevent::read(), the buffer cannot be read all at once.However, keeping
O_NONBLOCKenabled causes subsequentread()operations to malfunction, resulting in the program's termination. Therefore, I added a process that enablesO_NONBLOCKat the start ofread(), and disables it again after the reading is complete.