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/* $Id: systemmem-linux.cpp $ */
/** @file
* IPRT - RTSystemQueryTotalRam, Linux ring-3.
*/
/*
* Copyright (C) 2012-2020 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 <stdio.h>
#include <errno.h>
/* Satisfy compiller warning */
#define __EXPORTED_HEADERS__
#include <sys/sysinfo.h>
#undef __EXPORTED_HEADERS__
RTDECL(int) RTSystemQueryTotalRam(uint64_t *pcb)
{
AssertPtrReturn(pcb, VERR_INVALID_POINTER);
struct sysinfo info;
int rc = sysinfo(&info);
if (rc == 0)
{
*pcb = (uint64_t)info.totalram * info.mem_unit;
return VINF_SUCCESS;
}
return RTErrConvertFromErrno(errno);
}
RTDECL(int) RTSystemQueryAvailableRam(uint64_t *pcb)
{
AssertPtrReturn(pcb, VERR_INVALID_POINTER);
FILE *pFile = fopen("/proc/meminfo", "r");
if (pFile)
{
int rc = VERR_NOT_FOUND;
uint64_t cbTotal = 0;
uint64_t cbFree = 0;
uint64_t cbBuffers = 0;
uint64_t cbCached = 0;
char sz[256];
while (fgets(sz, sizeof(sz), pFile))
{
if (!strncmp(sz, RT_STR_TUPLE("MemTotal:")))
rc = RTStrToUInt64Ex(RTStrStripL(&sz[sizeof("MemTotal:")]), NULL, 0, &cbTotal);
else if (!strncmp(sz, RT_STR_TUPLE("MemFree:")))
rc = RTStrToUInt64Ex(RTStrStripL(&sz[sizeof("MemFree:")]), NULL, 0, &cbFree);
else if (!strncmp(sz, RT_STR_TUPLE("Buffers:")))
rc = RTStrToUInt64Ex(RTStrStripL(&sz[sizeof("Buffers:")]), NULL, 0, &cbBuffers);
else if (!strncmp(sz, RT_STR_TUPLE("Cached:")))
rc = RTStrToUInt64Ex(RTStrStripL(&sz[sizeof("Cached:")]), NULL, 0, &cbCached);
if (RT_FAILURE(rc))
break;
}
fclose(pFile);
if (RT_SUCCESS(rc))
{
*pcb = (cbFree + cbBuffers + cbCached) * _1K;
return VINF_SUCCESS;
}
}
/*
* Fallback (e.g. /proc not mapped) to sysinfo. Less accurat because there
* is no information about the cached memory. 'Cached:' from above is only
* accessible through proc :-(
*/
struct sysinfo info;
int rc = sysinfo(&info);
if (rc == 0)
{
*pcb = ((uint64_t)info.freeram + info.bufferram) * info.mem_unit;
return VINF_SUCCESS;
}
return RTErrConvertFromErrno(errno);
}
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