clock_t - system time

       Used  for  system time in clock ticks or CLOCKS_PER_SEC (defined in <time.h>).  According to POSIX, it is
       an integer type or a real-floating type.

       C89, POSIX.1-2001.

       Standard C library (libc)

       clock_t - system time

       The following headers also provide this type: <sys/types.h> and <sys/times.h>.

times(2), clock(3)

Linux man-pages 6.9.1                              2024-05-02                                     clock_t(3type)

       C11, POSIX.1-2008.

#include<time.h>typedef /* ... */ clock_t;