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/* $Id: getrusage.c,v 1.11 1998/12/12 19:57:51 momjian Exp $ */
#include <stdio.h>
#include <errno.h>
#include "rusagestub.h"
/* This code works on:
* univel
* solaris_i386
* sco
* solaris_sparc
* svr4
* hpux 9.*
* which currently is all the supported platforms that don't have a
* native version of getrusage(). So, if configure decides to compile
* this file at all, we just use this version unconditionally.
*/
int
getrusage(int who, struct rusage * rusage)
{
struct tms tms;
int tick_rate = CLK_TCK; /* ticks per second */
clock_t u,
s;
if (rusage == (struct rusage *) NULL)
{
errno = EFAULT;
return -1;
}
if (times(&tms) < 0)
{
/* errno set by times */
return -1;
}
switch (who)
{
case RUSAGE_SELF:
u = tms.tms_utime;
s = tms.tms_stime;
break;
case RUSAGE_CHILDREN:
u = tms.tms_cutime;
s = tms.tms_cstime;
break;
default:
errno = EINVAL;
return -1;
}
#define TICK_TO_SEC(T, RATE) ((T)/(RATE))
#define TICK_TO_USEC(T,RATE) (((T)%(RATE)*1000000)/RATE)
rusage->ru_utime.tv_sec = TICK_TO_SEC(u, tick_rate);
rusage->ru_utime.tv_usec = TICK_TO_USEC(u, tick_rate);
rusage->ru_stime.tv_sec = TICK_TO_SEC(s, tick_rate);
rusage->ru_stime.tv_usec = TICK_TO_USEC(u, tick_rate);
return 0;
}
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