NAME
clock —
determine processor time
used
LIBRARY
library “libc”
SYNOPSIS
#include
<time.h>
clock_t
clock(void);
DESCRIPTION
Theclock()
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
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.
DragonFly does not conform to this requirement;
changing the value would introduce binary incompatibility and one million is
still inadequate on modern processors.