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65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
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#include "libcompat.h"
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#ifdef __MACH__
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#include <mach/clock.h>
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#include <mach/mach.h>
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#include <mach/mach_time.h>
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#include <unistd.h>
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#endif
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#define NANOSECONDS_PER_SECOND 1000000000
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int
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clock_gettime (clockid_t clk_id CK_ATTRIBUTE_UNUSED, struct timespec *ts)
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{
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#ifdef __MACH__
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/* OS X does not have clock_gettime, use mach_absolute_time */
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static mach_timebase_info_data_t sTimebaseInfo;
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uint64_t rawTime;
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uint64_t nanos;
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rawTime = mach_absolute_time ();
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/*
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* OS X has a function to convert abs time to nano seconds: AbsoluteToNanoseconds
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* However, the function may not be available as we may not have
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* access to CoreServices. Because of this, we convert the abs time
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* to nano seconds manually.
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*/
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/*
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* First grab the time base used on the system, if this is the first
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* time we are being called. We can check if the value is uninitialized,
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* as the denominator will be zero.
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*/
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if (sTimebaseInfo.denom == 0) {
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(void) mach_timebase_info (&sTimebaseInfo);
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}
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/*
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* Do the conversion. We hope that the multiplication doesn't
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* overflow; the price you pay for working in fixed point.
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*/
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nanos = rawTime * sTimebaseInfo.numer / sTimebaseInfo.denom;
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/*
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* Fill in the timespec container
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*/
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ts->tv_sec = nanos / NANOSECONDS_PER_SECOND;
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ts->tv_nsec = nanos - (ts->tv_sec * NANOSECONDS_PER_SECOND);
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#else
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/*
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* As there is no function to fall back onto to get the current
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* time, zero out the time so the caller will have a sane value.
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*/
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ts->tv_sec = 0;
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ts->tv_nsec = 0;
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#endif
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return 0;
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}
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