clock - report CPU time used by a process

Syntax	#include <time.h> clock_t clock(void);
Description	The behavior of clock() is determined by the selected functionality (see "Selecting functionality") as described below: When called with POSIX functionality, clock() returns the elapsed CPU time since the first clock call. BS2000 When called with BS2000 functionality, clock() returns the CPU time since the start of the program. (End)
Return val.	Amount of CPU time elapsed since the first call to clock() if successful. The return value for the first call to clock() is 0. BS2000 CPU time since the start of the program
		if successful. (End)
	(clock_t)-1	if the CPU time is not available or cannot be represented. This applies to both POSIX and BS2000 functionality.
Notes	The value returned by clock() is defined in ten thousandths of a second for compatibility across systems that have CPU clocks with high resolutions. Consequently, the value returned by clock() may wrap around to 0 on some systems. For example, on a machine with 32-bit values for clock_t, it will wrap after 2147 seconds or 36 minutes. If the CPU time is to be specified in seconds, the return value of clock() must be divided by the value of the macro CLOCKS_PER_SEC (see time.h).
See also	asctime(), cputime(), ctime(), difftime(), gmtime(), localtime(), mktime(), strftime(), strptime(), system(), time(), times(), utime(), wait(), time.h, "Selecting functionality".