/* $Id: systemmem-freebsd.cpp $ */
/** @file
 * IPRT - RTSystemQueryTotalRam, Linux ring-3.
 */

/*
 * Copyright (C) 2012-2019 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 *
 * The contents of this file may alternatively be used under the terms
 * of the Common Development and Distribution License Version 1.0
 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
 * VirtualBox OSE distribution, in which case the provisions of the
 * CDDL are applicable instead of those of the GPL.
 *
 * You may elect to license modified versions of this file under the
 * terms and conditions of either the GPL or the CDDL or both.
 */


/*********************************************************************************************************************************
*   Header Files                                                                                                                 *
*********************************************************************************************************************************/
#include <iprt/system.h>
#include "internal/iprt.h"

#include <iprt/errcore.h>
#include <iprt/assert.h>
#include <iprt/string.h>

#include <sys/types.h>
#include <sys/sysctl.h>
#include <errno.h>


RTDECL(int) RTSystemQueryTotalRam(uint64_t *pcb)
{
    int rc = VINF_SUCCESS;
    u_long cbMemPhys = 0;
    size_t cbParameter = sizeof(cbMemPhys);

    AssertPtrReturn(pcb, VERR_INVALID_POINTER);

    if (!sysctlbyname("hw.physmem", &cbMemPhys, &cbParameter, NULL, 0))
    {
        *pcb = cbMemPhys;
        return VINF_SUCCESS;
    }
    return RTErrConvertFromErrno(errno);
}


RTDECL(int) RTSystemQueryAvailableRam(uint64_t *pcb)
{
    AssertPtrReturn(pcb, VERR_INVALID_POINTER);

    int rc = VINF_SUCCESS;
    u_int cPagesMemFree = 0;
    u_int cPagesMemInactive = 0;
    u_int cPagesMemCached = 0;
    u_int cPagesMemUsed = 0;
    int cbPage = 0;
    size_t cbParameter;
    int cProcessed = 0;

    cbParameter = sizeof(cPagesMemFree);
    if (sysctlbyname("vm.stats.vm.v_free_count", &cPagesMemFree, &cbParameter, NULL, 0))
        rc = RTErrConvertFromErrno(errno);
    cbParameter = sizeof(cPagesMemUsed);
    if (   RT_SUCCESS(rc)
        && sysctlbyname("vm.stats.vm.v_active_count", &cPagesMemUsed, &cbParameter, NULL, 0))
        rc = RTErrConvertFromErrno(errno);
    cbParameter = sizeof(cPagesMemInactive);
    if (   RT_SUCCESS(rc)
        && sysctlbyname("vm.stats.vm.v_inactive_count", &cPagesMemInactive, &cbParameter, NULL, 0))
        rc = RTErrConvertFromErrno(errno);
    cbParameter = sizeof(cPagesMemCached);
    if (   RT_SUCCESS(rc)
        && sysctlbyname("vm.stats.vm.v_cache_count", &cPagesMemCached, &cbParameter, NULL, 0))
        rc = RTErrConvertFromErrno(errno);
    cbParameter = sizeof(cbPage);
    if (   RT_SUCCESS(rc)
        && sysctlbyname("hw.pagesize", &cbPage, &cbParameter, NULL, 0))
        rc = RTErrConvertFromErrno(errno);

    if (RT_SUCCESS(rc))
        *pcb = (cPagesMemFree + cPagesMemInactive + cPagesMemCached ) * cbPage;

    return rc;
}