3 time, nsec \- time in seconds and nanoseconds since epoch
20 return the time since the epoch 00:00:00 GMT, Jan. 1, 1970.
21 The return value of the former is in seconds and the latter in nanoseconds.
28 is also set to the answer.
30 These functions work by reading
33 .B /sys/src/libc/9sys/time.c
35 .B /sys/src/libc/9sys/nsec.c