43 lines
1 KiB
C
43 lines
1 KiB
C
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#include "sysutil.h"
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#include <sys/time.h>
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/*
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* This routine returns the time in seconds since 1.1.1970. MINIX is an
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* astrophysically naive system that assumes the earth rotates at a constant
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* rate and that such things as leap seconds do not exist. If a non-NULL
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* pointer to a timespec structure is given, that structure is filled with
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* the current time in subsecond precision.
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*/
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time_t
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clock_time(struct timespec *tv)
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{
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uint32_t system_hz;
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clock_t uptime, realtime;
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time_t boottime, sec;
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int r;
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if ((r = getuptime(&uptime, &realtime, &boottime)) != OK)
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panic("clock_time: getuptime failed: %d", r);
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system_hz = sys_hz(); /* sys_hz() caches its return value */
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sec = boottime + realtime / system_hz;
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if (tv != NULL) {
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tv->tv_sec = sec;
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/*
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* We do not want to overflow, and system_hz can be as high as
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* 50kHz.
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*/
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if (system_hz < LONG_MAX / 40000)
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tv->tv_nsec = (realtime % system_hz) * 40000 /
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system_hz * 25000;
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else
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tv->tv_nsec = 0; /* bad, but what's better? */
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}
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return sec;
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}
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