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#include <limits.h> // for LONG_MAX
#include <time.h> // for timespec, clock_gettime, CLOCK_PROCESS_CPUTIME_ID
clock_t clock(void)
{
struct timespec ts;
if (clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts))
return -1;
if (ts.tv_sec > LONG_MAX / 1000000 || ts.tv_nsec / 1000 > LONG_MAX - 1000000 * ts.tv_sec)
return -1;
return ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
}
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