/* $Id: systemmem-linux.cpp 62477 2016-07-22 18:27:37Z vboxsync $ */ /** @file * IPRT - RTSystemQueryTotalRam, Linux ring-3. */ /* * Copyright (C) 2012-2016 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 #include "internal/iprt.h" #include #include #include #include #include /* Satisfy compiller warning */ #define __EXPORTED_HEADERS__ #include #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); }