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	time.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	time.c (920B)
	---
	1 #include <u.h>
	2 #include <sys/time.h>
	3 #include <time.h>
	4 #include <sys/resource.h>
	5 #define NOPLAN9DEFINES
	6 #include <libc.h>
	7
	8 long
	9 p9times(long *t)
	10 {
	11 struct rusage ru, cru;
	12
	13 if(getrusage(0, &ru) < 0 \|\| getrusage(-1, &cru) < 0)
	14 return -1;
	15
	16 t[0] = ru.ru_utime.tv_sec*1000 + ru.ru_utime.tv_usec/1000;
	17 t[1] = ru.ru_stime.tv_sec*1000 + ru.ru_stime.tv_usec/1000;
	18 t[2] = cru.ru_utime.tv_sec*1000 + cru.ru_utime.tv_usec/1000;
	19 t[3] = cru.ru_stime.tv_sec*1000 + cru.ru_stime.tv_usec/1000;
	20
	21 /* BUG */
	22 return t[0]+t[1]+t[2]+t[3];
	23 }
	24
	25 double
	26 p9cputime(void)
	27 {
	28 long t[4];
	29 double d;
	30
	31 if(p9times(t) < 0)
	32 return -1.0;
	33
	34 d = (double)t[0]+(double)t[1]+(double)t[2]+(double)t[3];
	35 return d/1000.0;
	36 }
	37
	38 vlong
	39 p9nsec(void)
	40 {
	41 struct timeval tv;
	42
	43 if(gettimeofday(&tv, 0) < 0)
	44 return -1;
	45
	46 return (vlong)tv.tv_sec100010001000 + tv.tv_usec1000;
	47 }
	48
	49 long
	50 p9time(long *tt)
	51 {
	52 long t;
	53 t = time(0);
	54 if(tt)
	55 *tt = t;
	56 return t;
	57 }
	58