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/*-------------------------------------------------------------------------
*
* getrusage.c
* get information about resource utilisation
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/port/getrusage.c
*
*-------------------------------------------------------------------------
*/

#include "c.h"

#include "rusagestub.h"

/* This code works on:
* sco
* solaris_i386
* solaris_sparc
* hpux 9.*
* win32
* 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

FILETIME starttime;
FILETIME exittime;
FILETIME kerneltime;
FILETIME usertime;
ULARGE_INTEGER li;

if (who != RUSAGE_SELF)
{
/* Only RUSAGE_SELF is supported in this implementation for now */
errno = EINVAL;
return -1;
}

if (rusage == (struct rusage *) NULL)
{
errno = EFAULT;
return -1;
}
memset(rusage, 0, sizeof(struct rusage));
if (GetProcessTimes(GetCurrentProcess(),
&starttime, &exittime, &kerneltime, &usertime) == 0)
{
_dosmaperr(GetLastError());
return -1;
}

/* Convert FILETIMEs (0.1 us) to struct timeval */
memcpy(&li, &kerneltime, sizeof(FILETIME));
li.QuadPart /= 10L; /* Convert to microseconds */
rusage->ru_stime.tv_sec = li.QuadPart / 1000000L;
rusage->ru_stime.tv_usec = li.QuadPart % 1000000L;

memcpy(&li, &usertime, sizeof(FILETIME));
li.QuadPart /= 10L; /* Convert to microseconds */
rusage->ru_utime.tv_sec = li.QuadPart / 1000000L;
rusage->ru_utime.tv_usec = li.QuadPart % 1000000L;
#else /* all but WIN32 */

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 /* WIN32 */

return 0;
}
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