ipc/glue/SharedMemoryBasic_android.cpp@6474c204b198 (annotated)
ipc/glue/SharedMemoryBasic_android.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- |
| michael@0 | 2 | * vim: sw=2 ts=8 et : |
| michael@0 | 3 | */ |
| michael@0 | 4 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 5 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 6 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 7 | |
| michael@0 | 8 | #include <android/log.h> |
| michael@0 | 9 | #include <errno.h> |
| michael@0 | 10 | #include <fcntl.h> |
| michael@0 | 11 | #include <string.h> |
| michael@0 | 12 | #include <sys/ioctl.h> |
| michael@0 | 13 | #include <sys/mman.h> |
| michael@0 | 14 | #include <sys/stat.h> |
| michael@0 | 15 | #include <sys/types.h> |
| michael@0 | 16 | #include <unistd.h> |
| michael@0 | 17 | |
| michael@0 | 18 | #include "base/process_util.h" |
| michael@0 | 19 | |
| michael@0 | 20 | #include "SharedMemoryBasic.h" |
| michael@0 | 21 | |
| michael@0 | 22 | // |
| michael@0 | 23 | // Temporarily go directly to the kernel interface until we can |
| michael@0 | 24 | // interact better with libcutils. |
| michael@0 | 25 | // |
| michael@0 | 26 | #include <linux/ashmem.h> |
| michael@0 | 27 | |
| michael@0 | 28 | namespace mozilla { |
| michael@0 | 29 | namespace ipc { |
| michael@0 | 30 | |
| michael@0 | 31 | static void |
| michael@0 | 32 | LogError(const char* what) |
| michael@0 | 33 | { |
| michael@0 | 34 | __android_log_print(ANDROID_LOG_ERROR, "Gecko", |
| michael@0 | 35 | "%s: %s (%d)", what, strerror(errno), errno); |
| michael@0 | 36 | } |
| michael@0 | 37 | |
| michael@0 | 38 | SharedMemoryBasic::SharedMemoryBasic() |
| michael@0 | 39 | : mShmFd(-1) |
| michael@0 | 40 | , mMemory(nullptr) |
| michael@0 | 41 | { } |
| michael@0 | 42 | |
| michael@0 | 43 | SharedMemoryBasic::SharedMemoryBasic(const Handle& aHandle) |
| michael@0 | 44 | : mShmFd(aHandle.fd) |
| michael@0 | 45 | , mMemory(nullptr) |
| michael@0 | 46 | { } |
| michael@0 | 47 | |
| michael@0 | 48 | SharedMemoryBasic::~SharedMemoryBasic() |
| michael@0 | 49 | { |
| michael@0 | 50 | Unmap(); |
| michael@0 | 51 | Destroy(); |
| michael@0 | 52 | } |
| michael@0 | 53 | |
| michael@0 | 54 | bool |
| michael@0 | 55 | SharedMemoryBasic::Create(size_t aNbytes) |
| michael@0 | 56 | { |
| michael@0 | 57 | NS_ABORT_IF_FALSE(-1 == mShmFd, "Already Create()d"); |
| michael@0 | 58 | |
| michael@0 | 59 | // Carve a new instance off of /dev/ashmem |
| michael@0 | 60 | int shmfd = open("/" ASHMEM_NAME_DEF, O_RDWR, 0600); |
| michael@0 | 61 | if (-1 == shmfd) { |
| michael@0 | 62 | LogError("ShmemAndroid::Create():open"); |
| michael@0 | 63 | return false; |
| michael@0 | 64 | } |
| michael@0 | 65 | |
| michael@0 | 66 | if (ioctl(shmfd, ASHMEM_SET_SIZE, aNbytes)) { |
| michael@0 | 67 | LogError("ShmemAndroid::Unmap():ioctl(SET_SIZE)"); |
| michael@0 | 68 | close(shmfd); |
| michael@0 | 69 | return false; |
| michael@0 | 70 | } |
| michael@0 | 71 | |
| michael@0 | 72 | mShmFd = shmfd; |
| michael@0 | 73 | Created(aNbytes); |
| michael@0 | 74 | return true; |
| michael@0 | 75 | } |
| michael@0 | 76 | |
| michael@0 | 77 | bool |
| michael@0 | 78 | SharedMemoryBasic::Map(size_t nBytes) |
| michael@0 | 79 | { |
| michael@0 | 80 | NS_ABORT_IF_FALSE(nullptr == mMemory, "Already Map()d"); |
| michael@0 | 81 | |
| michael@0 | 82 | mMemory = mmap(nullptr, nBytes, |
| michael@0 | 83 | PROT_READ | PROT_WRITE, |
| michael@0 | 84 | MAP_SHARED, |
| michael@0 | 85 | mShmFd, |
| michael@0 | 86 | 0); |
| michael@0 | 87 | if (MAP_FAILED == mMemory) { |
| michael@0 | 88 | LogError("ShmemAndroid::Map()"); |
| michael@0 | 89 | mMemory = nullptr; |
| michael@0 | 90 | return false; |
| michael@0 | 91 | } |
| michael@0 | 92 | |
| michael@0 | 93 | Mapped(nBytes); |
| michael@0 | 94 | return true; |
| michael@0 | 95 | } |
| michael@0 | 96 | |
| michael@0 | 97 | bool |
| michael@0 | 98 | SharedMemoryBasic::ShareToProcess(base::ProcessHandle/*unused*/, |
| michael@0 | 99 | Handle* aNewHandle) |
| michael@0 | 100 | { |
| michael@0 | 101 | NS_ABORT_IF_FALSE(mShmFd >= 0, "Should have been Create()d by now"); |
| michael@0 | 102 | |
| michael@0 | 103 | int shmfdDup = dup(mShmFd); |
| michael@0 | 104 | if (-1 == shmfdDup) { |
| michael@0 | 105 | LogError("ShmemAndroid::ShareToProcess()"); |
| michael@0 | 106 | return false; |
| michael@0 | 107 | } |
| michael@0 | 108 | |
| michael@0 | 109 | aNewHandle->fd = shmfdDup; |
| michael@0 | 110 | aNewHandle->auto_close = true; |
| michael@0 | 111 | return true; |
| michael@0 | 112 | } |
| michael@0 | 113 | |
| michael@0 | 114 | void |
| michael@0 | 115 | SharedMemoryBasic::Unmap() |
| michael@0 | 116 | { |
| michael@0 | 117 | if (!mMemory) { |
| michael@0 | 118 | return; |
| michael@0 | 119 | } |
| michael@0 | 120 | |
| michael@0 | 121 | if (munmap(mMemory, Size())) { |
| michael@0 | 122 | LogError("ShmemAndroid::Unmap()"); |
| michael@0 | 123 | } |
| michael@0 | 124 | mMemory = nullptr; |
| michael@0 | 125 | } |
| michael@0 | 126 | |
| michael@0 | 127 | void |
| michael@0 | 128 | SharedMemoryBasic::Destroy() |
| michael@0 | 129 | { |
| michael@0 | 130 | if (mShmFd > 0) { |
| michael@0 | 131 | close(mShmFd); |
| michael@0 | 132 | } |
| michael@0 | 133 | } |
| michael@0 | 134 | |
| michael@0 | 135 | } // namespace ipc |
| michael@0 | 136 | } // namespace mozilla |
