NAME    [Toc]    [Back]

     clock -- determine processor time used

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <time.h>

     clock_t
     clock(void);

DESCRIPTION    [Toc]    [Back]

     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    [Toc]    [Back]

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

SEE ALSO    [Toc]    [Back]

     getrusage(2), clocks(7)

STANDARDS    [Toc]    [Back]

     The clock() function conforms to ISO/IEC 9899:1990 (``ISO C89'').	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 incompatibility
 and one million is still inadequate on modern processors.


FreeBSD 5.2.1			 June 4, 1993			 FreeBSD 5.2.1