1 | /* $Id: systemmem-linux.cpp 82968 2020-02-04 10:35:17Z 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) 2012-2020 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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