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CLOCK(3) Library Functions Manual CLOCK(3)

clock
determine processor time used

#include <time.h>

clock_t
clock(void);

The clock() function determines the amount of processor time used since the invocation of the calling process, measured in CLOCKS_PER_SECs.

The clock() function returns the amount of time used unless an error occurs, in which case the return value is -1.

getrusage(2)

The clock() function conforms to ANSI X3.159-1989 (“ANSI C89”).
June 5, 2013 OpenBSD-current