1 files changed, 119 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/linux/systemmem-linux.cpp b/src/VBox/Runtime/r3/linux/systemmem-linux.cpp
new file mode 100644
index 00000000..11764ab7
--- /dev/null
+++ b/src/VBox/Runtime/r3/linux/systemmem-linux.cpp
@@ -0,0 +1,119 @@
+/* $Id: systemmem-linux.cpp $ */
+/** @file
+ * IPRT - RTSystemQueryTotalRam, Linux ring-3.
+ */
+
+/*
+ * Copyright (C) 2012-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   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);
+}
+