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https://man7.org/linux/man-pages/man3/sd_bus_get_timeout.3.html
sd_bus_get_fd(3) - Linux manual page
fd 3 linuxsd busgetmanual
https://man7.org/linux/man-pages/man3/umad_get_fd.3.html
umad_get_fd(3) - Linux manual page
fd 3 linuxumadgetmanual
https://man7.org/linux/man-pages/man3/sd_bus_set_fd.3.html
sd_bus_set_fd(3) - Linux manual page
sd bus setfd 3 linuxmanual