timeradd, timersub, timercmp, timerclear, timerisset

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This manual	Reference	Other manuals
timeradd(3)	referred by	gettimeofday(2) \| gettimeofday(2freebsd) \| settimeofday(2freebsd) \| time(7)
timeradd(3)	refer to	feature_test_macros(7) \| gettimeofday(2) \| time(7)