1 2 #include "sysutil.h" 3 #include <sys/time.h> 4 5 /* 6 * This routine returns the time in seconds since 1.1.1970. MINIX is an 7 * astrophysically naive system that assumes the earth rotates at a constant 8 * rate and that such things as leap seconds do not exist. If a non-NULL 9 * pointer to a timespec structure is given, that structure is filled with 10 * the current time in subsecond precision. 11 */ 12 time_t 13 clock_time(struct timespec *tv) 14 { 15 uint32_t system_hz; 16 clock_t uptime, realtime; 17 time_t boottime, sec; 18 int r; 19 20 if ((r = getuptime(&uptime, &realtime, &boottime)) != OK) 21 panic("clock_time: getuptime failed: %d", r); 22 23 system_hz = sys_hz(); /* sys_hz() caches its return value */ 24 25 sec = boottime + realtime / system_hz; 26 27 if (tv != NULL) { 28 tv->tv_sec = sec; 29 30 /* 31 * We do not want to overflow, and system_hz can be as high as 32 * 50kHz. 33 */ 34 if (system_hz < LONG_MAX / 40000) 35 tv->tv_nsec = (realtime % system_hz) * 40000 / 36 system_hz * 25000; 37 else 38 tv->tv_nsec = 0; /* bad, but what's better? */ 39 } 40 41 return sec; 42 } 43