[75879] | 1 | /* $Id: shmem-posix.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Named shared memory object, POSIX Implementation.
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| 4 | */
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| 5 |
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| 6 | /*
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[98103] | 7 | * Copyright (C) 2018-2023 Oracle and/or its affiliates.
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[75879] | 8 | *
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[96407] | 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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[75879] | 11 | *
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[96407] | 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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[75879] | 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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[96407] | 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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[75879] | 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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[96407] | 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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[75879] | 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/shmem.h>
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| 42 | #include "internal/iprt.h"
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| 43 |
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| 44 | #include <iprt/asm.h>
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| 45 | #include <iprt/assert.h>
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| 46 | #include <iprt/cdefs.h>
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| 47 | #include <iprt/err.h>
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| 48 | #include <iprt/mem.h>
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| 49 | #include <iprt/string.h>
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| 50 | #include "internal/magics.h"
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| 51 |
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| 52 | #include <errno.h>
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| 53 | #include <sys/mman.h>
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| 54 | #include <sys/stat.h>
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| 55 | #include <fcntl.h>
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| 56 | #include <unistd.h>
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| 57 | #include <limits.h>
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| 58 |
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[75883] | 59 | /* Workaround on systems which do not provide this. */
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[75879] | 60 | #ifndef NAME_MAX
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| 61 | # define NAME_MAX 255
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| 62 | #endif
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| 63 |
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[75883] | 64 |
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[75879] | 65 | /*********************************************************************************************************************************
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| 66 | * Structures and Typedefs *
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| 67 | *********************************************************************************************************************************/
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| 68 |
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| 69 | /**
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| 70 | * Shared memory object mapping descriptor.
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| 71 | */
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| 72 | typedef struct RTSHMEMMAPPINGDESC
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| 73 | {
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| 74 | /** Number of references held to this mapping, 0 if the descriptor is free. */
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| 75 | volatile uint32_t cMappings;
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| 76 | /** Pointer to the region mapping. */
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[75883] | 77 | void *pvMapping;
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[75879] | 78 | /** Start offset */
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| 79 | size_t offRegion;
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| 80 | /** Size of the region. */
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| 81 | size_t cbRegion;
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| 82 | /** Access flags for this region .*/
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| 83 | uint32_t fFlags;
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| 84 | } RTSHMEMMAPPINGDESC;
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| 85 | /** Pointer to a shared memory object mapping descriptor. */
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| 86 | typedef RTSHMEMMAPPINGDESC *PRTSHMEMMAPPINGDESC;
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| 87 | /** Pointer to a constant shared memory object mapping descriptor. */
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| 88 | typedef const RTSHMEMMAPPINGDESC *PCRTSHMEMMAPPINGDESC;
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| 89 |
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| 90 |
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| 91 | /**
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| 92 | * Internal shared memory object state.
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| 93 | */
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| 94 | typedef struct RTSHMEMINT
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| 95 | {
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| 96 | /** Magic value (RTSHMEM_MAGIC). */
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| 97 | uint32_t u32Magic;
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| 98 | /** File descriptor for the underlying shared memory object. */
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| 99 | int iFdShm;
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[75883] | 100 | /** Pointer to the shared memory object name. */
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| 101 | char *pszName;
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[75879] | 102 | /** Flag whether this instance created the named shared memory object. */
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| 103 | bool fCreate;
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| 104 | /** Overall number of mappings active for this shared memory object. */
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| 105 | volatile uint32_t cMappings;
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| 106 | /** Maximum number of mapping descriptors allocated. */
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| 107 | uint32_t cMappingDescsMax;
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| 108 | /** Number of mapping descriptors used. */
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| 109 | volatile uint32_t cMappingDescsUsed;
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| 110 | /** Array of mapping descriptors - variable in size. */
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| 111 | RTSHMEMMAPPINGDESC aMappingDescs[1];
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| 112 | } RTSHMEMINT;
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| 113 | /** Pointer to the internal shared memory object state. */
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| 114 | typedef RTSHMEMINT *PRTSHMEMINT;
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| 115 |
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| 116 |
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| 117 |
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| 118 | /**
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| 119 | * Returns a mapping descriptor matching the given region properties or NULL if none was found.
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| 120 | *
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| 121 | * @returns Pointer to the matching mapping descriptor or NULL if not found.
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| 122 | * @param pThis Pointer to the shared memory object instance.
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| 123 | * @param offRegion Offset into the shared memory object to start mapping at.
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| 124 | * @param cbRegion Size of the region to map.
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| 125 | * @param fFlags Desired properties of the mapped region, combination of RTSHMEM_MAP_F_* defines.
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| 126 | */
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| 127 | DECLINLINE(PRTSHMEMMAPPINGDESC) rtShMemMappingDescFindByProp(PRTSHMEMINT pThis, size_t offRegion, size_t cbRegion, uint32_t fFlags)
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| 128 | {
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| 129 | for (uint32_t i = 0; i < pThis->cMappingDescsMax; i++)
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| 130 | {
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| 131 | if ( pThis->aMappingDescs[i].offRegion == offRegion
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| 132 | && pThis->aMappingDescs[i].cbRegion == cbRegion
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| 133 | && pThis->aMappingDescs[i].fFlags == fFlags)
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| 134 | return &pThis->aMappingDescs[i];
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| 135 | }
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| 136 |
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| 137 | return NULL;
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| 138 | }
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| 139 |
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| 140 |
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| 141 | RTDECL(int) RTShMemOpen(PRTSHMEM phShMem, const char *pszName, uint32_t fFlags, size_t cbMax, uint32_t cMappingsHint)
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| 142 | {
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| 143 | AssertPtrReturn(phShMem, VERR_INVALID_PARAMETER);
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| 144 | AssertPtrReturn(pszName, VERR_INVALID_PARAMETER);
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| 145 | AssertReturn(!(fFlags & ~RTSHMEM_O_F_VALID_MASK), VERR_INVALID_PARAMETER);
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| 146 | AssertReturn(cMappingsHint < 64, VERR_OUT_OF_RANGE);
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| 147 |
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| 148 | size_t cchName = strlen(pszName);
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| 149 | AssertReturn(cchName, VERR_INVALID_PARAMETER);
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| 150 | AssertReturn(cchName < NAME_MAX - 1, VERR_INVALID_PARAMETER); /* account for the / we add later on. */
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| 151 | cMappingsHint = cMappingsHint == 0 ? 5 : cMappingsHint;
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| 152 | int rc = VINF_SUCCESS;
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| 153 | PRTSHMEMINT pThis = (PRTSHMEMINT)RTMemAllocZ(RT_UOFFSETOF_DYN(RTSHMEMINT, aMappingDescs[cMappingsHint]) + cchName + 2); /* '/' + terminator. */
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| 154 | if (RT_LIKELY(pThis))
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| 155 | {
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| 156 | pThis->u32Magic = RTSHMEM_MAGIC;
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| 157 | pThis->pszName = (char *)&pThis->aMappingDescs[cMappingsHint];
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| 158 | /*pThis->fCreate = false; */
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| 159 | /*pThis->cMappings = 0; */
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| 160 | pThis->cMappingDescsMax = cMappingsHint;
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| 161 | /*pThis->cMappingDescsUsed = 0; */
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| 162 | pThis->pszName[0] = '/';
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| 163 | memcpy(&pThis->pszName[1], pszName, cchName);
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| 164 | int fShmFlags = 0;
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| 165 | if (fFlags & RTSHMEM_O_F_CREATE)
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| 166 | {
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| 167 | fShmFlags |= O_CREAT;
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| 168 | pThis->fCreate = true;
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| 169 | }
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| 170 | if ((fFlags & RTSHMEM_O_F_CREATE_EXCL) == RTSHMEM_O_F_CREATE_EXCL)
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| 171 | fShmFlags |= O_EXCL;
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| 172 | if ( (fFlags & RTSHMEM_O_F_READWRITE) == RTSHMEM_O_F_READWRITE
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| 173 | || (fFlags & RTSHMEM_O_F_WRITE))
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| 174 | fShmFlags |= O_RDWR;
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| 175 | else
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| 176 | fShmFlags |= O_RDONLY;
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| 177 | if (fFlags & RTSHMEM_O_F_TRUNCATE)
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| 178 | fShmFlags |= O_TRUNC;
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| 179 | pThis->iFdShm = shm_open(pThis->pszName, fShmFlags , 0600);
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| 180 | if (pThis->iFdShm > 0)
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| 181 | {
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| 182 | if (cbMax)
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| 183 | rc = RTShMemSetSize(pThis, cbMax);
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| 184 | if (RT_SUCCESS(rc))
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| 185 | {
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| 186 | *phShMem = pThis;
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| 187 | return VINF_SUCCESS;
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| 188 | }
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| 189 |
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| 190 | close(pThis->iFdShm);
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| 191 | }
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| 192 | else
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| 193 | rc = RTErrConvertFromErrno(errno);
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| 194 |
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| 195 | RTMemFree(pThis);
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| 196 | }
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| 197 | else
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| 198 | rc = VERR_NO_MEMORY;
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| 199 |
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| 200 | return rc;
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| 201 | }
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| 202 |
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| 203 |
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| 204 | RTDECL(int) RTShMemClose(RTSHMEM hShMem)
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| 205 | {
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| 206 | PRTSHMEMINT pThis = hShMem;
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| 207 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
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| 208 | AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
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| 209 | AssertReturn(!pThis->cMappings, VERR_INVALID_STATE);
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| 210 |
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| 211 | int rc = VINF_SUCCESS;
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| 212 | if (!close(pThis->iFdShm))
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| 213 | {
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| 214 | if (pThis->fCreate)
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| 215 | shm_unlink(pThis->pszName); /* Ignore any error here. */
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| 216 | pThis->u32Magic = RTSHMEM_MAGIC_DEAD;
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| 217 | RTMemFree(pThis);
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| 218 | }
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| 219 | else
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| 220 | rc = RTErrConvertFromErrno(errno);
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| 221 |
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| 222 | return rc;
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| 223 | }
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| 224 |
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| 225 |
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[78561] | 226 | RTDECL(int) RTShMemDelete(const char *pszName)
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| 227 | {
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| 228 | AssertPtrReturn(pszName, VERR_INVALID_POINTER);
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| 229 |
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| 230 | size_t cchName = strlen(pszName);
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| 231 | AssertReturn(cchName, VERR_INVALID_PARAMETER);
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| 232 | AssertReturn(cchName < NAME_MAX - 1, VERR_INVALID_PARAMETER); /* account for the / we add later on. */
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| 233 | char *psz = NULL;
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| 234 |
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| 235 | int rc = RTStrAllocEx(&psz, cchName + 2); /* '/' + terminator */
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| 236 | if (RT_SUCCESS(rc))
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| 237 | {
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| 238 | psz[0] = '/';
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| 239 | memcpy(&psz[1], pszName, cchName + 1);
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| 240 | if (shm_unlink(psz))
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| 241 | rc = RTErrConvertFromErrno(errno);
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| 242 | RTStrFree(psz);
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| 243 | }
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| 244 |
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| 245 | return rc;
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| 246 | }
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| 247 |
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| 248 |
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[75879] | 249 | RTDECL(uint32_t) RTShMemRefCount(RTSHMEM hShMem)
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| 250 | {
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| 251 | PRTSHMEMINT pThis = hShMem;
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| 252 | AssertPtrReturn(pThis, 0);
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| 253 | AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, 0);
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| 254 |
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| 255 | return pThis->cMappings;
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| 256 | }
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| 257 |
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| 258 |
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| 259 | RTDECL(int) RTShMemSetSize(RTSHMEM hShMem, size_t cbMem)
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| 260 | {
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| 261 | PRTSHMEMINT pThis = hShMem;
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| 262 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
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| 263 | AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
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| 264 | AssertReturn(!pThis->cMappings, VERR_INVALID_STATE);
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| 265 |
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| 266 | int rc = VINF_SUCCESS;
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| 267 | if (ftruncate(pThis->iFdShm, (off_t)cbMem))
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| 268 | rc = RTErrConvertFromErrno(errno);
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| 269 |
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| 270 | return rc;
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| 271 | }
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| 272 |
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| 273 |
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| 274 | RTDECL(int) RTShMemQuerySize(RTSHMEM hShMem, size_t *pcbMem)
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| 275 | {
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| 276 | PRTSHMEMINT pThis = hShMem;
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| 277 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
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| 278 | AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
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| 279 | AssertPtrReturn(pcbMem, VERR_INVALID_PARAMETER);
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| 280 |
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| 281 | struct stat st;
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| 282 | if (!fstat(pThis->iFdShm, &st))
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| 283 | {
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| 284 | *pcbMem = st.st_size;
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| 285 | return VINF_SUCCESS;
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| 286 | }
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| 287 | return RTErrConvertFromErrno(errno);
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| 288 | }
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| 289 |
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| 290 |
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| 291 | RTDECL(int) RTShMemMapRegion(RTSHMEM hShMem, size_t offRegion, size_t cbRegion, uint32_t fFlags, void **ppv)
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| 292 | {
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| 293 | PRTSHMEMINT pThis = hShMem;
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| 294 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
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| 295 | AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
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| 296 | AssertPtrReturn(ppv, VERR_INVALID_PARAMETER);
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| 297 | AssertReturn(!(fFlags & ~RTSHMEM_MAP_F_VALID_MASK), VERR_INVALID_PARAMETER);
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| 298 |
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| 299 | /* Try to find a mapping with compatible parameters first. */
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| 300 | PRTSHMEMMAPPINGDESC pMappingDesc = NULL;
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| 301 | for (uint32_t iTry = 0; iTry < 10; iTry++)
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| 302 | {
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| 303 | pMappingDesc = rtShMemMappingDescFindByProp(pThis, offRegion, cbRegion, fFlags);
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| 304 | if (!pMappingDesc)
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| 305 | break;
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| 306 |
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| 307 | /* Increase the mapping count and check that the region is still accessible by us. */
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| 308 | if ( ASMAtomicIncU32(&pMappingDesc->cMappings) > 1
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| 309 | && pMappingDesc->offRegion == offRegion
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| 310 | && pMappingDesc->cbRegion == cbRegion
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| 311 | && pMappingDesc->fFlags == fFlags)
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| 312 | break;
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| 313 | /* Mapping was freed inbetween, next round. */
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| 314 | }
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| 315 |
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| 316 | int rc = VINF_SUCCESS;
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| 317 | if (!pMappingDesc)
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| 318 | {
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| 319 | /* Find an empty region descriptor and map the region. */
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| 320 | for (uint32_t i = 0; i < pThis->cMappingDescsMax && !pMappingDesc; i++)
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| 321 | {
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| 322 | if (!pThis->aMappingDescs[i].cMappings)
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| 323 | {
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[75881] | 324 | pMappingDesc = &pThis->aMappingDescs[i];
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| 325 |
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[75879] | 326 | /* Try to grab this one. */
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| 327 | if (ASMAtomicIncU32(&pMappingDesc->cMappings) == 1)
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| 328 | break;
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| 329 |
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| 330 | /* Somebody raced us, drop reference and continue. */
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| 331 | ASMAtomicDecU32(&pMappingDesc->cMappings);
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[75881] | 332 | pMappingDesc = NULL;
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[75879] | 333 | }
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| 334 | }
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| 335 |
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| 336 | if (RT_LIKELY(pMappingDesc))
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| 337 | {
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| 338 | /* Try to map it. */
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| 339 | int fMmapFlags = 0;
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| 340 | int fProt = 0;
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| 341 | if (fFlags & RTSHMEM_MAP_F_READ)
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| 342 | fProt |= PROT_READ;
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| 343 | if (fFlags & RTSHMEM_MAP_F_WRITE)
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| 344 | fProt |= PROT_WRITE;
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| 345 | if (fFlags & RTSHMEM_MAP_F_EXEC)
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| 346 | fProt |= PROT_EXEC;
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| 347 | if (fFlags & RTSHMEM_MAP_F_COW)
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| 348 | fMmapFlags |= MAP_PRIVATE;
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| 349 | else
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| 350 | fMmapFlags |= MAP_SHARED;
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| 351 |
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| 352 | void *pv = mmap(NULL, cbRegion, fProt, fMmapFlags, pThis->iFdShm, (off_t)offRegion);
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| 353 | if (pv != MAP_FAILED)
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| 354 | {
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| 355 | pMappingDesc->pvMapping = pv;
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| 356 | pMappingDesc->offRegion = offRegion;
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| 357 | pMappingDesc->cbRegion = cbRegion;
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| 358 | pMappingDesc->fFlags = fFlags;
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| 359 | }
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| 360 | else
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| 361 | {
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| 362 | rc = RTErrConvertFromErrno(errno);
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| 363 | ASMAtomicDecU32(&pMappingDesc->cMappings);
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| 364 | }
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| 365 | }
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| 366 | else
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| 367 | rc = VERR_SHMEM_MAXIMUM_MAPPINGS_REACHED;
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| 368 | }
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| 369 |
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| 370 | if (RT_SUCCESS(rc))
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| 371 | {
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| 372 | *ppv = pMappingDesc->pvMapping;
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| 373 | ASMAtomicIncU32(&pThis->cMappings);
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| 374 | }
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| 375 |
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| 376 | return rc;
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| 377 | }
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| 378 |
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| 379 |
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| 380 | RTDECL(int) RTShMemUnmapRegion(RTSHMEM hShMem, void *pv)
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| 381 | {
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| 382 | PRTSHMEMINT pThis = hShMem;
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| 383 | AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
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| 384 | AssertReturn(pThis->u32Magic == RTSHMEM_MAGIC, VERR_INVALID_HANDLE);
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| 385 | AssertPtrReturn(pv, VERR_INVALID_PARAMETER);
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| 386 |
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| 387 | /* Find the mapping descriptor by the given region address. */
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| 388 | PRTSHMEMMAPPINGDESC pMappingDesc = NULL;
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| 389 | for (uint32_t i = 0; i < pThis->cMappingDescsMax && !pMappingDesc; i++)
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| 390 | {
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| 391 | if (pThis->aMappingDescs[i].pvMapping == pv)
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| 392 | {
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| 393 | pMappingDesc = &pThis->aMappingDescs[i];
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| 394 | break;
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| 395 | }
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| 396 | }
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| 397 |
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| 398 | AssertPtrReturn(pMappingDesc, VERR_INVALID_PARAMETER);
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| 399 |
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| 400 | int rc = VINF_SUCCESS;
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| 401 | size_t cbRegion = pMappingDesc->cMappings;
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| 402 | if (!ASMAtomicDecU32(&pMappingDesc->cMappings))
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| 403 | {
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| 404 | /* Last mapping of this region was unmapped, so do the real unmapping now. */
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| 405 | if (munmap(pv, cbRegion))
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| 406 | {
|
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| 407 | ASMAtomicIncU32(&pMappingDesc->cMappings);
|
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| 408 | rc = RTErrConvertFromErrno(errno);
|
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| 409 | }
|
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| 410 | else
|
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| 411 | {
|
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| 412 | ASMAtomicDecU32(&pThis->cMappingDescsUsed);
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| 413 | ASMAtomicDecU32(&pThis->cMappings);
|
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| 414 | }
|
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| 415 | }
|
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| 416 |
|
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| 417 | return rc;
|
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| 418 | }
|
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| 419 |
|
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