==== trivial ====
cc -O2 -pipe  -Wall -Wpointer-arith -Wuninitialized -Wstrict-prototypes -Wmissing-prototypes -Wunused -Wsign-compare -Wshadow  -MD -MP  -c /home/src/regress/sys/kern/nanosleep/nanosleep.c
cc   -o nanosleep nanosleep.o 
./nanosleep -t

==== with_signal ====
./nanosleep -s

==== time_elapsed ====
./nanosleep -e

==== time_elapsed_with_signal ====
./nanosleep -E

==== short_time ====
./nanosleep -S

==== invalid_time ====
./nanosleep -i