pragmatism first

timeval, timespec

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This manual	Reference	Other manuals
timeval(3bsd)	referred by	libbsd(7) \| timeradd(3bsd)
timeval(3bsd)	refer to	clock_getres(2) \| gettimeofday(2) \| libbsd(7) \| nanosleep(2) \| timeradd(3bsd)