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## CLOCKIndex## NAMEclock - Determine processor time## SYNOPSIS
## DESCRIPTIONTheclock()
function returns an approximation of processor time used by the program.
## RETURN VALUEThe value returned is the CPU time used so far as aclock_t;
to get the number of seconds used, divide by
CLOCKS_PER_SEC.
If the processor time used is not available or its value cannot
be represented, the function returns the value (clock_t)-1.
## CONFORMING TOANSI C. POSIX requires that CLOCKS_PER_SEC equals 1000000 independent of the actual resolution.## NOTESThe C standard allows for arbitrary values at the start of the program; subtract the value returned from a call toclock()
at the start of the program to get maximum portability.
Note that the time can wrap around. On a 32bit system where CLOCKS_PER_SEC equals 1000000 this function will return the same value approximately every 72 minutes.
On several other implementations,
the value returned by
## SEE ALSOgetrusage(2),
times(2)
## Index |