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CLOCK(3)	       FreeBSD 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
     occurs, 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'').	How-
     ever, 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.

FreeBSD	11.2			 June 4, 1993			  FreeBSD 11.2

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS

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