| 1 | /* $Id: systemmem-linux.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - RTSystemQueryTotalRam, Linux ring-3.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2012-2022 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <iprt/system.h>
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| 32 | #include "internal/iprt.h"
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| 33 |
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| 34 | #include <iprt/errcore.h>
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| 35 | #include <iprt/assert.h>
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| 36 | #include <iprt/string.h>
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| 37 |
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| 38 | #include <stdio.h>
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| 39 | #include <errno.h>
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| 40 |
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| 41 | /* Satisfy compiller warning */
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| 42 | #define __EXPORTED_HEADERS__
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| 43 | #include <sys/sysinfo.h>
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| 44 | #undef __EXPORTED_HEADERS__
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| 45 |
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| 46 |
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| 47 | RTDECL(int) RTSystemQueryTotalRam(uint64_t *pcb)
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| 48 | {
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| 49 | AssertPtrReturn(pcb, VERR_INVALID_POINTER);
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| 50 |
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| 51 | struct sysinfo info;
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| 52 | int rc = sysinfo(&info);
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| 53 | if (rc == 0)
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| 54 | {
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| 55 | *pcb = (uint64_t)info.totalram * info.mem_unit;
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| 56 | return VINF_SUCCESS;
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| 57 | }
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| 58 | return RTErrConvertFromErrno(errno);
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| 59 | }
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| 60 |
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| 61 |
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| 62 | RTDECL(int) RTSystemQueryAvailableRam(uint64_t *pcb)
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| 63 | {
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| 64 | AssertPtrReturn(pcb, VERR_INVALID_POINTER);
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| 65 |
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| 66 | FILE *pFile = fopen("/proc/meminfo", "r");
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| 67 | if (pFile)
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| 68 | {
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| 69 | int rc = VERR_NOT_FOUND;
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| 70 | uint64_t cbTotal = 0;
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| 71 | uint64_t cbFree = 0;
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| 72 | uint64_t cbBuffers = 0;
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| 73 | uint64_t cbCached = 0;
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| 74 | char sz[256];
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| 75 | while (fgets(sz, sizeof(sz), pFile))
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| 76 | {
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| 77 | if (!strncmp(sz, RT_STR_TUPLE("MemTotal:")))
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| 78 | rc = RTStrToUInt64Ex(RTStrStripL(&sz[sizeof("MemTotal:")]), NULL, 0, &cbTotal);
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| 79 | else if (!strncmp(sz, RT_STR_TUPLE("MemFree:")))
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| 80 | rc = RTStrToUInt64Ex(RTStrStripL(&sz[sizeof("MemFree:")]), NULL, 0, &cbFree);
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| 81 | else if (!strncmp(sz, RT_STR_TUPLE("Buffers:")))
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| 82 | rc = RTStrToUInt64Ex(RTStrStripL(&sz[sizeof("Buffers:")]), NULL, 0, &cbBuffers);
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| 83 | else if (!strncmp(sz, RT_STR_TUPLE("Cached:")))
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| 84 | rc = RTStrToUInt64Ex(RTStrStripL(&sz[sizeof("Cached:")]), NULL, 0, &cbCached);
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| 85 | if (RT_FAILURE(rc))
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| 86 | break;
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| 87 | }
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| 88 | fclose(pFile);
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| 89 | if (RT_SUCCESS(rc))
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| 90 | {
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| 91 | *pcb = (cbFree + cbBuffers + cbCached) * _1K;
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| 92 | return VINF_SUCCESS;
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| 93 | }
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| 94 | }
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| 95 | /*
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| 96 | * Fallback (e.g. /proc not mapped) to sysinfo. Less accurat because there
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| 97 | * is no information about the cached memory. 'Cached:' from above is only
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| 98 | * accessible through proc :-(
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| 99 | */
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| 100 | struct sysinfo info;
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| 101 | int rc = sysinfo(&info);
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| 102 | if (rc == 0)
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| 103 | {
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| 104 | *pcb = ((uint64_t)info.freeram + info.bufferram) * info.mem_unit;
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| 105 | return VINF_SUCCESS;
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| 106 | }
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| 107 | return RTErrConvertFromErrno(errno);
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| 108 | }
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| 109 |
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