win32getrusage.c

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/*-------------------------------------------------------------------------
 *
 * win32getrusage.c
 *    get information about resource utilisation
 *
 * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *    src/port/win32getrusage.c
 *
 *-------------------------------------------------------------------------
 */
 
#include "c.h"
 
#include <sys/resource.h>
 
int
getrusage(int who, struct rusage *rusage)
{
    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;
 
    return 0;
}