| 1 | /* $Id: systemmem-linux.cpp 98103 2023-01-17 14:15:46Z 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) 2012-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include <iprt/system.h>
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| 42 | #include "internal/iprt.h"
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| 43 |
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| 44 | #include <iprt/errcore.h>
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| 45 | #include <iprt/assert.h>
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| 46 | #include <iprt/string.h>
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| 47 |
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| 48 | #include <stdio.h>
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| 49 | #include <errno.h>
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| 50 |
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| 51 | /* Satisfy compiller warning */
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| 52 | #define __EXPORTED_HEADERS__
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| 53 | #include <sys/sysinfo.h>
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| 54 | #undef __EXPORTED_HEADERS__
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| 55 |
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| 56 |
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| 57 | RTDECL(int) RTSystemQueryTotalRam(uint64_t *pcb)
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| 58 | {
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| 59 | AssertPtrReturn(pcb, VERR_INVALID_POINTER);
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| 60 |
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| 61 | struct sysinfo info;
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| 62 | int rc = sysinfo(&info);
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| 63 | if (rc == 0)
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| 64 | {
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| 65 | *pcb = (uint64_t)info.totalram * info.mem_unit;
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| 66 | return VINF_SUCCESS;
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| 67 | }
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| 68 | return RTErrConvertFromErrno(errno);
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| 69 | }
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| 70 |
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| 71 |
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| 72 | RTDECL(int) RTSystemQueryAvailableRam(uint64_t *pcb)
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| 73 | {
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| 74 | AssertPtrReturn(pcb, VERR_INVALID_POINTER);
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| 75 |
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| 76 | FILE *pFile = fopen("/proc/meminfo", "r");
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| 77 | if (pFile)
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| 78 | {
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| 79 | int rc = VERR_NOT_FOUND;
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| 80 | uint64_t cbTotal = 0;
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| 81 | uint64_t cbFree = 0;
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| 82 | uint64_t cbBuffers = 0;
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| 83 | uint64_t cbCached = 0;
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| 84 | char sz[256];
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| 85 | while (fgets(sz, sizeof(sz), pFile))
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| 86 | {
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| 87 | if (!strncmp(sz, RT_STR_TUPLE("MemTotal:")))
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| 88 | rc = RTStrToUInt64Ex(RTStrStripL(&sz[sizeof("MemTotal:")]), NULL, 0, &cbTotal);
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| 89 | else if (!strncmp(sz, RT_STR_TUPLE("MemFree:")))
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| 90 | rc = RTStrToUInt64Ex(RTStrStripL(&sz[sizeof("MemFree:")]), NULL, 0, &cbFree);
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| 91 | else if (!strncmp(sz, RT_STR_TUPLE("Buffers:")))
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| 92 | rc = RTStrToUInt64Ex(RTStrStripL(&sz[sizeof("Buffers:")]), NULL, 0, &cbBuffers);
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| 93 | else if (!strncmp(sz, RT_STR_TUPLE("Cached:")))
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| 94 | rc = RTStrToUInt64Ex(RTStrStripL(&sz[sizeof("Cached:")]), NULL, 0, &cbCached);
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| 95 | if (RT_FAILURE(rc))
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| 96 | break;
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| 97 | }
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| 98 | fclose(pFile);
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| 99 | if (RT_SUCCESS(rc))
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| 100 | {
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| 101 | *pcb = (cbFree + cbBuffers + cbCached) * _1K;
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| 102 | return VINF_SUCCESS;
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| 103 | }
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| 104 | }
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| 105 | /*
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| 106 | * Fallback (e.g. /proc not mapped) to sysinfo. Less accurat because there
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| 107 | * is no information about the cached memory. 'Cached:' from above is only
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| 108 | * accessible through proc :-(
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| 109 | */
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| 110 | struct sysinfo info;
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| 111 | int rc = sysinfo(&info);
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| 112 | if (rc == 0)
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| 113 | {
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| 114 | *pcb = ((uint64_t)info.freeram + info.bufferram) * info.mem_unit;
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| 115 | return VINF_SUCCESS;
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| 116 | }
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| 117 | return RTErrConvertFromErrno(errno);
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| 118 | }
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| 119 |
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