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diff --git a/src/VBox/Runtime/testcase/tstRTShMem.cpp b/src/VBox/Runtime/testcase/tstRTShMem.cpp
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+/* $Id: tstRTShMem.cpp $ */
+/** @file
+ * IPRT Testcase - RTShMem.
+ */
+
+/*
+ * Copyright (C) 2018-2022 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/shmem.h>
+
+#include <iprt/err.h>
+#include <iprt/log.h>
+#include <iprt/string.h>
+#include <iprt/test.h>
+
+
+/*********************************************************************************************************************************
+* Global Variables *
+*********************************************************************************************************************************/
+/** Global shared memory object used across all tests. */
+static RTSHMEM g_hShMem = NIL_RTSHMEM;
+/** Data to read/write initially. */
+static char g_szDataBefore[] = "Data before modification!";
+/** Data to read/write for the modification. */
+static char g_szDataAfter[] = "Data after modification!";
+
+
+
+static void tstRTShMem2(void)
+{
+ RTTestISub("Negative");
+
+ /** @todo */
+}
+
+
+static void tstRTShMem1(void)
+{
+ RTTestISub("Basics");
+
+ /* create and destroy. */
+ int rc = RTShMemOpen(&g_hShMem, "tstRTShMem-Share", RTSHMEM_O_F_CREATE_EXCL | RTSHMEM_O_F_READWRITE | RTSHMEM_O_F_MAYBE_EXEC,
+ _512K, 0);
+ if (RT_FAILURE(rc))
+ {
+ RTTESTI_CHECK_RC_RETV(rc, VERR_ALREADY_EXISTS);
+ RTTESTI_CHECK_RC(RTShMemDelete("tstRTShMem-Share"), VINF_SUCCESS);
+ RTTESTI_CHECK_RC_RETV(RTShMemOpen(&g_hShMem, "tstRTShMem-Share", RTSHMEM_O_F_CREATE | RTSHMEM_O_F_READWRITE | RTSHMEM_O_F_MAYBE_EXEC,
+ _512K, 0),
+ VINF_SUCCESS);
+ }
+
+ RTTESTI_CHECK_RETV(g_hShMem != NIL_RTSHMEM);
+
+ /* Query the size. */
+ size_t cbShMem = 0;
+ RTTESTI_CHECK_RC(RTShMemQuerySize(g_hShMem, &cbShMem), VINF_SUCCESS);
+ RTTESTI_CHECK(cbShMem == _512K);
+
+ /* Create a mapping. */
+ void *pvMap;
+ RTTESTI_CHECK_RC_RETV(RTShMemMapRegion(g_hShMem, 0, cbShMem, RTSHMEM_MAP_F_READ | RTSHMEM_MAP_F_WRITE, &pvMap), VINF_SUCCESS);
+ memset(pvMap, 0, cbShMem);
+ memcpy(pvMap, &g_szDataBefore[0], sizeof(g_szDataBefore));
+
+ /* Open the shared memory object and create a second mapping. */
+ RTSHMEM hShMemRead = NIL_RTSHMEM;
+ RTTESTI_CHECK_RC_RETV(RTShMemOpen(&hShMemRead, "tstRTShMem-Share", RTSHMEM_O_F_READWRITE | RTSHMEM_O_F_MAYBE_EXEC,
+ 0, 0),
+ VINF_SUCCESS);
+ RTTESTI_CHECK_RETV(hShMemRead != NIL_RTSHMEM);
+
+ void *pvMapRead = NULL;
+ RTTESTI_CHECK_RC(RTShMemQuerySize(hShMemRead, &cbShMem), VINF_SUCCESS);
+ RTTESTI_CHECK(cbShMem == _512K);
+ RTTESTI_CHECK_RC_RETV(RTShMemMapRegion(hShMemRead, 0, cbShMem, RTSHMEM_MAP_F_READ | RTSHMEM_MAP_F_WRITE, &pvMapRead), VINF_SUCCESS);
+ RTTESTI_CHECK(!memcmp(pvMapRead, &g_szDataBefore[0], sizeof(g_szDataBefore)));
+ RTTESTI_CHECK(!memcmp(pvMapRead, pvMap, cbShMem));
+
+ /* Alter the data in the first mapping and check that it is visible in the second one. */
+ memcpy(pvMap, &g_szDataAfter[0], sizeof(g_szDataAfter));
+ RTTESTI_CHECK(!memcmp(pvMapRead, &g_szDataAfter[0], sizeof(g_szDataAfter)));
+ RTTESTI_CHECK(!memcmp(pvMapRead, pvMap, cbShMem));
+
+ RTTESTI_CHECK_RC(RTShMemUnmapRegion(hShMemRead, pvMapRead), VINF_SUCCESS);
+ RTTESTI_CHECK_RC(RTShMemClose(hShMemRead), VINF_SUCCESS);
+ RTTESTI_CHECK_RC(RTShMemUnmapRegion(g_hShMem, pvMap), VINF_SUCCESS);
+ RTTESTI_CHECK_RC(RTShMemClose(g_hShMem), VINF_SUCCESS);
+ g_hShMem = NIL_RTSHMEM;
+}
+
+int main()
+{
+ RTTEST hTest;
+ int rc = RTTestInitAndCreate("tstRTShMem", &hTest);
+ if (rc)
+ return rc;
+ RTTestBanner(hTest);
+
+ /*
+ * The tests.
+ */
+ tstRTShMem1();
+ if (RTTestErrorCount(hTest) == 0)
+ {
+ bool fMayPanic = RTAssertMayPanic();
+ bool fQuiet = RTAssertAreQuiet();
+ RTAssertSetMayPanic(false);
+ RTAssertSetQuiet(true);
+ tstRTShMem2();
+ RTAssertSetQuiet(fQuiet);
+ RTAssertSetMayPanic(fMayPanic);
+ }
+
+ if (g_hShMem != NIL_RTSHMEM)
+ {
+ RTTESTI_CHECK_RC(RTShMemClose(g_hShMem), VINF_SUCCESS);
+ g_hShMem = NIL_RTSHMEM;
+ }
+
+ /*
+ * Summary.
+ */
+ return RTTestSummaryAndDestroy(hTest);
+}
+