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