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/*-------------------------------------------------------------------------
*
* getusage.c
* 64-bit versions of fseeko/ftello()
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/port/getrusage.c,v 1.4 2003/11/29 19:52:13 pgsql Exp $
*
*-------------------------------------------------------------------------
*/
#include <stdio.h>
#include <errno.h>
#include "postgres.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)
{
#ifdef WIN32
if (rusage)
memset(rusage, 0, sizeof(rusage));
#else
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);
#endif
return 0;
}
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