| CLOCK(3) | Library Functions Manual | CLOCK(3) | 
clock —
#include <time.h>
clock_t
  
  clock(void);
clock() function determines the amount of processor
  time used since the invocation of the calling process, measured in
  CLOCKS_PER_SECs.
clock() function returns the amount of time used
  unless an error occurs, in which case the return value is -1.
clock() function conforms to ANSI
  X3.159-1989 (“ANSI C89”).
| June 4, 1993 | NetBSD 10.0 |