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#include "sysutil.h"
#include <sys/time.h>
/*
* This routine returns the time in seconds since 1.1.1970. MINIX is an
* astrophysically naive system that assumes the earth rotates at a constant
* rate and that such things as leap seconds do not exist. If a non-NULL
* pointer to a timespec structure is given, that structure is filled with
* the current time in subsecond precision.
*/
time_t
clock_time(struct timespec *tv)
{
struct minix_kerninfo *minix_kerninfo;
uint32_t system_hz;
clock_t realtime;
time_t boottime, sec;
minix_kerninfo = get_minix_kerninfo();
/* We assume atomic 32-bit field retrieval. TODO: 64-bit support. */
boottime = minix_kerninfo->kclockinfo->boottime;
realtime = minix_kerninfo->kclockinfo->realtime;
system_hz = minix_kerninfo->kclockinfo->hz;
sec = boottime + realtime / system_hz;
if (tv != NULL) {
tv->tv_sec = sec;
/*
* We do not want to overflow, and system_hz can be as high as
* 50kHz.
*/
if (system_hz < LONG_MAX / 40000)
tv->tv_nsec = (realtime % system_hz) * 40000 /
system_hz * 25000;
else
tv->tv_nsec = 0; /* bad, but what's better? */
}
return sec;
}
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