postgresql/src/backend/port/getrusage.c

/* $Id: getrusage.c,v 1.8 1998/06/19 02:55:04 momjian Exp $ */

#include <math.h>				/* for pow() prototype */

#include <errno.h>
#include "rusagestub.h"

#if 0							/* this is from univel port ... how does
								 * compiler define? */
 /* same for solaris_i386 port ... how does compiler define? */
 /* same for sco port ... how does compiler define? */
 /* same for solaris_sparc port ... how does compiler define? */
 /* same for svr4 port ... how does compiler define? */
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);
}

#endif

#if 0							/* this is for hpux port ... how does
								 * compiler define? */
getrusage(int who, struct rusage * ru)
{
	return (syscall(SYS_GETRUSAGE, who, ru));
}

#endif