1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ipc/glue/SharedMemoryBasic_android.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,136 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + * vim: sw=2 ts=8 et :
1.6 + */
1.7 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.8 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.9 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.10 +
1.11 +#include <android/log.h>
1.12 +#include <errno.h>
1.13 +#include <fcntl.h>
1.14 +#include <string.h>
1.15 +#include <sys/ioctl.h>
1.16 +#include <sys/mman.h>
1.17 +#include <sys/stat.h>
1.18 +#include <sys/types.h>
1.19 +#include <unistd.h>
1.20 +
1.21 +#include "base/process_util.h"
1.22 +
1.23 +#include "SharedMemoryBasic.h"
1.24 +
1.25 +//
1.26 +// Temporarily go directly to the kernel interface until we can
1.27 +// interact better with libcutils.
1.28 +//
1.29 +#include <linux/ashmem.h>
1.30 +
1.31 +namespace mozilla {
1.32 +namespace ipc {
1.33 +
1.34 +static void
1.35 +LogError(const char* what)
1.36 +{
1.37 + __android_log_print(ANDROID_LOG_ERROR, "Gecko",
1.38 + "%s: %s (%d)", what, strerror(errno), errno);
1.39 +}
1.40 +
1.41 +SharedMemoryBasic::SharedMemoryBasic()
1.42 + : mShmFd(-1)
1.43 + , mMemory(nullptr)
1.44 +{ }
1.45 +
1.46 +SharedMemoryBasic::SharedMemoryBasic(const Handle& aHandle)
1.47 + : mShmFd(aHandle.fd)
1.48 + , mMemory(nullptr)
1.49 +{ }
1.50 +
1.51 +SharedMemoryBasic::~SharedMemoryBasic()
1.52 +{
1.53 + Unmap();
1.54 + Destroy();
1.55 +}
1.56 +
1.57 +bool
1.58 +SharedMemoryBasic::Create(size_t aNbytes)
1.59 +{
1.60 + NS_ABORT_IF_FALSE(-1 == mShmFd, "Already Create()d");
1.61 +
1.62 + // Carve a new instance off of /dev/ashmem
1.63 + int shmfd = open("/" ASHMEM_NAME_DEF, O_RDWR, 0600);
1.64 + if (-1 == shmfd) {
1.65 + LogError("ShmemAndroid::Create():open");
1.66 + return false;
1.67 + }
1.68 +
1.69 + if (ioctl(shmfd, ASHMEM_SET_SIZE, aNbytes)) {
1.70 + LogError("ShmemAndroid::Unmap():ioctl(SET_SIZE)");
1.71 + close(shmfd);
1.72 + return false;
1.73 + }
1.74 +
1.75 + mShmFd = shmfd;
1.76 + Created(aNbytes);
1.77 + return true;
1.78 +}
1.79 +
1.80 +bool
1.81 +SharedMemoryBasic::Map(size_t nBytes)
1.82 +{
1.83 + NS_ABORT_IF_FALSE(nullptr == mMemory, "Already Map()d");
1.84 +
1.85 + mMemory = mmap(nullptr, nBytes,
1.86 + PROT_READ | PROT_WRITE,
1.87 + MAP_SHARED,
1.88 + mShmFd,
1.89 + 0);
1.90 + if (MAP_FAILED == mMemory) {
1.91 + LogError("ShmemAndroid::Map()");
1.92 + mMemory = nullptr;
1.93 + return false;
1.94 + }
1.95 +
1.96 + Mapped(nBytes);
1.97 + return true;
1.98 +}
1.99 +
1.100 +bool
1.101 +SharedMemoryBasic::ShareToProcess(base::ProcessHandle/*unused*/,
1.102 + Handle* aNewHandle)
1.103 +{
1.104 + NS_ABORT_IF_FALSE(mShmFd >= 0, "Should have been Create()d by now");
1.105 +
1.106 + int shmfdDup = dup(mShmFd);
1.107 + if (-1 == shmfdDup) {
1.108 + LogError("ShmemAndroid::ShareToProcess()");
1.109 + return false;
1.110 + }
1.111 +
1.112 + aNewHandle->fd = shmfdDup;
1.113 + aNewHandle->auto_close = true;
1.114 + return true;
1.115 +}
1.116 +
1.117 +void
1.118 +SharedMemoryBasic::Unmap()
1.119 +{
1.120 + if (!mMemory) {
1.121 + return;
1.122 + }
1.123 +
1.124 + if (munmap(mMemory, Size())) {
1.125 + LogError("ShmemAndroid::Unmap()");
1.126 + }
1.127 + mMemory = nullptr;
1.128 +}
1.129 +
1.130 +void
1.131 +SharedMemoryBasic::Destroy()
1.132 +{
1.133 + if (mShmFd > 0) {
1.134 + close(mShmFd);
1.135 + }
1.136 +}
1.137 +
1.138 +} // namespace ipc
1.139 +} // namespace mozilla
