Acquire the current time.
#include <zircon/syscalls.h> zx_status_t zx_clock_get(zx_clock_t clock_id, zx_time_t* out);
zx_clock_get() returns the current time of clock_id via
out, and returns whether clock_id was valid.
SUPPORTED CLOCK IDS
ZX_CLOCK_MONOTONIC number of nanoseconds since the system was powered on.
ZX_CLOCK_UTC number of wall clock nanoseconds since the Unix epoch (midnight on January 1 1970) in UTC
ZX_CLOCK_THREAD number of nanoseconds the current thread has been running for.
zx_clock_get() returns ZX_OK.
ZX_ERR_INVALID_ARGS clock_id is not a valid clock id, or out is an invalid pointer.
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