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CLOCK(3) BSD Library Functions Manual CLOCK(3) NAME clock -- determine processor time used LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <time.h> clock_t clock(void); DESCRIPTION The clock() function determines the amount of processor time used since the invocation of the calling process, measured in CLOCKS_PER_SECs of a second. RETURN VALUES The clock() function returns the amount of time used unless an error oc- curs, in which case the return value is -1. SEE ALSO getrusage(2), clocks(7) STANDARDS The clock() function conforms to ISO/IEC 9899:1990 ("ISO C90"). However, Version 2 of the Single UNIX Specification ("SUSv2") requires CLOCKS_PER_SEC to be defined as one million. FreeBSD does not conform to this requirement; changing the value would introduce binary incompatibil- ity and one million is still inadequate on modern processors. BSD June 4, 1993 BSD
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS
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