DragonFly On-Line Manual Pages


CLOCK(3)	      DragonFly 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. DragonFly does not conform to this requirement; changing the value would introduce binary incompati- bility and one million is still inadequate on modern processors. DragonFly 4.1 June 4, 1993 DragonFly 4.1