| 1 | /* $Id: mempage-native-posix.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - rtMemPageNative*, POSIX implementation.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2024 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 "internal/iprt.h"
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| 42 | #include <iprt/mem.h>
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| 43 |
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| 44 | #include <iprt/assert.h>
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| 45 | #include <iprt/errcore.h>
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| 46 | #include <iprt/param.h>
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| 47 | #include "internal/mem.h"
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| 48 |
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| 49 | #include <stdlib.h>
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| 50 | #include <errno.h>
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| 51 | #include <sys/mman.h>
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| 52 | #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
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| 53 | # define MAP_ANONYMOUS MAP_ANON
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| 54 | #endif
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| 55 |
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| 56 |
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| 57 |
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| 58 | DECLHIDDEN(int) rtMemPageNativeAlloc(size_t cb, uint32_t fFlags, void **ppvRet)
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| 59 | {
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| 60 | void *pvRet = mmap(NULL, cb,
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| 61 | PROT_READ | PROT_WRITE | (fFlags & RTMEMPAGEALLOC_F_EXECUTABLE ? PROT_EXEC : 0),
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| 62 | MAP_PRIVATE | MAP_ANONYMOUS,
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| 63 | -1, 0);
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| 64 | if (pvRet != MAP_FAILED)
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| 65 | {
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| 66 | *ppvRet = pvRet;
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| 67 | return VINF_SUCCESS;
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| 68 | }
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| 69 | *ppvRet = NULL;
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| 70 | return RTErrConvertFromErrno(errno);
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| 71 | }
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| 72 |
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| 73 |
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| 74 | DECLHIDDEN(int) rtMemPageNativeFree(void *pv, size_t cb)
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| 75 | {
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| 76 | int rc = munmap(pv, cb);
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| 77 | AssertMsgReturn(rc == 0, ("rc=%d pv=%p cb=%#zx errno=%d\n", rc, pv, cb, errno), RTErrConvertFromErrno(errno));
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| 78 | return VINF_SUCCESS;
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| 79 | }
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| 80 |
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| 81 |
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| 82 | DECLHIDDEN(uint32_t) rtMemPageNativeApplyFlags(void *pv, size_t cb, uint32_t fFlags)
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| 83 | {
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| 84 | uint32_t fRet = 0;
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| 85 | if (fFlags & RTMEMPAGEALLOC_F_ADVISE_LOCKED)
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| 86 | {
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| 87 | int rc = mlock(pv, cb);
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| 88 | #ifndef RT_OS_SOLARIS /* mlock(3C) on Solaris requires the priv_lock_memory privilege */
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| 89 | AssertMsg(rc == 0, ("mlock %p LB %#zx -> %d errno=%d\n", pv, cb, rc, errno));
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| 90 | #endif
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| 91 | if (rc == 0)
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| 92 | fRet |= RTMEMPAGEALLOC_F_ADVISE_LOCKED;
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| 93 | }
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| 94 |
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| 95 | #ifdef MADV_DONTDUMP
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| 96 | if (fFlags & RTMEMPAGEALLOC_F_ADVISE_NO_DUMP)
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| 97 | {
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| 98 | int rc = madvise(pv, cb, MADV_DONTDUMP);
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| 99 | AssertMsg(rc == 0, ("madvice %p LB %#zx MADV_DONTDUMP -> %d errno=%d\n", pv, cb, rc, errno));
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| 100 | if (rc == 0)
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| 101 | fRet |= RTMEMPAGEALLOC_F_ADVISE_NO_DUMP;
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| 102 | }
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| 103 | #endif
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| 104 | return fRet;
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| 105 | }
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| 106 |
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| 107 |
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| 108 | DECLHIDDEN(void) rtMemPageNativeRevertFlags(void *pv, size_t cb, uint32_t fFlags)
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| 109 | {
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| 110 | if (fFlags & RTMEMPAGEALLOC_F_ADVISE_LOCKED)
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| 111 | {
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| 112 | int rc = munlock(pv, cb);
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| 113 | AssertMsg(rc == 0, ("munlock %p LB %#zx -> %d errno=%d\n", pv, cb, rc, errno));
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| 114 | RT_NOREF(rc);
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| 115 | }
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| 116 |
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| 117 | #if defined(MADV_DONTDUMP) && defined(MADV_DODUMP)
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| 118 | if (fFlags & RTMEMPAGEALLOC_F_ADVISE_NO_DUMP)
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| 119 | {
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| 120 | int rc = madvise(pv, cb, MADV_DODUMP);
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| 121 | AssertMsg(rc == 0, ("madvice %p LB %#zx MADV_DODUMP -> %d errno=%d\n", pv, cb, rc, errno));
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| 122 | RT_NOREF(rc);
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| 123 | }
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| 124 | #endif
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| 125 | }
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| 126 |
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