108 #define timespecclear(tsp)    (tsp)->tv_sec = (tsp)->tv_nsec = 0  argument
109 #define timespecisset(tsp)    ((tsp)->tv_sec || (tsp)->tv_nsec)  argument
111 #define timespeccmp(tsp, usp, cmp)          \  argument
112   (((tsp)->tv_sec == (usp)->tv_sec) ?       \
113       ((tsp)->tv_nsec cmp (usp)->tv_nsec) :     \
114       ((tsp)->tv_sec cmp (usp)->tv_sec))
116 #define timespecadd(tsp, usp, vsp)          \  argument
118     (vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec;    \
119     (vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec; \
126 #define timespecsub(tsp, usp, vsp)          \  argument
128     (vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec;    \
129     (vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec; \