k_clock 118 include/linux/posix-timers.h extern struct k_clock clock_posix_cpu; k_clock 119 include/linux/posix-timers.h extern struct k_clock clock_posix_dynamic; k_clock 121 include/linux/posix-timers.h void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock);