NAME
clock - determine processor time used

SYNOPSIS
#include <sys/types.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 CLK_TCKs.

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)

STANDARDS
The clock function conforms to ANSI X3.159-1989.