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https://man7.org/linux/man-pages/man3/SD_EVENT_ARMED.3.html
sd_event_wait(3) - Linux manual page
wait 3 linuxsd eventmanual
https://man7.org/linux/man-pages/man3/sd_event_initial.3.html
sd_event_wait(3) - Linux manual page
wait 3 linuxsd eventmanual
https://man7.org/linux/man-pages/man3/sem_timedwait.3.html
sem_wait(3) - Linux manual page
wait 3 linuxsemmanual