VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/posix/mempage-native-posix.cpp@ 103795

Last change on this file since 103795 was 101162, checked in by vboxsync, 15 months ago

IPRT/mem: Use mempage /w heap code everwhere all the time. bugref:10370

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1/* $Id: mempage-native-posix.cpp 101162 2023-09-18 20:03:52Z vboxsync $ */
2/** @file
3 * IPRT - rtMemPageNative*, POSIX implementation.
4 */
5
6/*
7 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#include "internal/iprt.h"
42#include <iprt/mem.h>
43
44#include <iprt/assert.h>
45#include <iprt/errcore.h>
46#include <iprt/param.h>
47#include "internal/mem.h"
48
49#include <stdlib.h>
50#include <errno.h>
51#include <sys/mman.h>
52#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
53# define MAP_ANONYMOUS MAP_ANON
54#endif
55
56
57
58DECLHIDDEN(int) rtMemPageNativeAlloc(size_t cb, uint32_t fFlags, void **ppvRet)
59{
60 void *pvRet = mmap(NULL, cb,
61 PROT_READ | PROT_WRITE | (fFlags & RTMEMPAGEALLOC_F_EXECUTABLE ? PROT_EXEC : 0),
62 MAP_PRIVATE | MAP_ANONYMOUS,
63 -1, 0);
64 if (pvRet != MAP_FAILED)
65 {
66 *ppvRet = pvRet;
67 return VINF_SUCCESS;
68 }
69 *ppvRet = NULL;
70 return RTErrConvertFromErrno(errno);
71}
72
73
74DECLHIDDEN(int) rtMemPageNativeFree(void *pv, size_t cb)
75{
76 int rc = munmap(pv, cb);
77 AssertMsgReturn(rc == 0, ("rc=%d pv=%p cb=%#zx errno=%d\n", rc, pv, cb, errno), RTErrConvertFromErrno(errno));
78 return VINF_SUCCESS;
79}
80
81
82DECLHIDDEN(uint32_t) rtMemPageNativeApplyFlags(void *pv, size_t cb, uint32_t fFlags)
83{
84 uint32_t fRet = 0;
85 if (fFlags & RTMEMPAGEALLOC_F_ADVISE_LOCKED)
86 {
87 int rc = mlock(pv, cb);
88#ifndef RT_OS_SOLARIS /* mlock(3C) on Solaris requires the priv_lock_memory privilege */
89 AssertMsg(rc == 0, ("mlock %p LB %#zx -> %d errno=%d\n", pv, cb, rc, errno));
90#endif
91 if (rc == 0)
92 fRet |= RTMEMPAGEALLOC_F_ADVISE_LOCKED;
93 }
94
95#ifdef MADV_DONTDUMP
96 if (fFlags & RTMEMPAGEALLOC_F_ADVISE_NO_DUMP)
97 {
98 int rc = madvise(pv, cb, MADV_DONTDUMP);
99 AssertMsg(rc == 0, ("madvice %p LB %#zx MADV_DONTDUMP -> %d errno=%d\n", pv, cb, rc, errno));
100 if (rc == 0)
101 fRet |= RTMEMPAGEALLOC_F_ADVISE_NO_DUMP;
102 }
103#endif
104 return fRet;
105}
106
107
108DECLHIDDEN(void) rtMemPageNativeRevertFlags(void *pv, size_t cb, uint32_t fFlags)
109{
110 if (fFlags & RTMEMPAGEALLOC_F_ADVISE_LOCKED)
111 {
112 int rc = munlock(pv, cb);
113 AssertMsg(rc == 0, ("munlock %p LB %#zx -> %d errno=%d\n", pv, cb, rc, errno));
114 RT_NOREF(rc);
115 }
116
117#if defined(MADV_DONTDUMP) && defined(MADV_DODUMP)
118 if (fFlags & RTMEMPAGEALLOC_F_ADVISE_NO_DUMP)
119 {
120 int rc = madvise(pv, cb, MADV_DODUMP);
121 AssertMsg(rc == 0, ("madvice %p LB %#zx MADV_DODUMP -> %d errno=%d\n", pv, cb, rc, errno));
122 RT_NOREF(rc);
123 }
124#endif
125}
126
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