1 files changed, 132 insertions, 0 deletions
diff --git a/ipc/glue/SharedMemoryBasic_android.cpp b/ipc/glue/SharedMemoryBasic_android.cpp
new file mode 100644
index 0000000000..5c8279da6d
--- /dev/null
+++ b/ipc/glue/SharedMemoryBasic_android.cpp
@@ -0,0 +1,132 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <android/log.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "base/process_util.h"
+
+#include "SharedMemoryBasic.h"
+
+#include "mozilla/Ashmem.h"
+
+namespace mozilla {
+namespace ipc {
+
+static void LogError(const char* what) {
+  __android_log_print(ANDROID_LOG_ERROR, "Gecko", "%s: %s (%d)", what,
+                      strerror(errno), errno);
+}
+
+SharedMemoryBasic::SharedMemoryBasic()
+    : mShmFd(-1), mMemory(nullptr), mOpenRights(RightsReadWrite) {}
+
+SharedMemoryBasic::~SharedMemoryBasic() {
+  Unmap();
+  CloseHandle();
+}
+
+bool SharedMemoryBasic::SetHandle(Handle aHandle, OpenRights aRights) {
+  MOZ_ASSERT(-1 == mShmFd, "Already Create()d");
+  mShmFd = aHandle.release();
+  mOpenRights = aRights;
+  return true;
+}
+
+bool SharedMemoryBasic::Create(size_t aNbytes) {
+  MOZ_ASSERT(-1 == mShmFd, "Already Create()d");
+
+  // Carve a new instance off of /dev/ashmem
+  int shmfd = mozilla::android::ashmem_create(nullptr, aNbytes);
+  if (-1 == shmfd) {
+    LogError("ShmemAndroid::Create():open");
+    return false;
+  }
+
+  mShmFd = shmfd;
+  Created(aNbytes);
+  return true;
+}
+
+bool SharedMemoryBasic::Map(size_t nBytes, void* fixed_address) {
+  MOZ_ASSERT(nullptr == mMemory, "Already Map()d");
+
+  int prot = PROT_READ;
+  if (mOpenRights == RightsReadWrite) {
+    prot |= PROT_WRITE;
+  }
+
+  // Don't use MAP_FIXED when a fixed_address was specified, since that can
+  // replace pages that are alread mapped at that address.
+  mMemory = mmap(fixed_address, nBytes, prot, MAP_SHARED, mShmFd, 0);
+
+  if (MAP_FAILED == mMemory) {
+    if (!fixed_address) {
+      LogError("ShmemAndroid::Map()");
+    }
+    mMemory = nullptr;
+    return false;
+  }
+
+  if (fixed_address && mMemory != fixed_address) {
+    if (munmap(mMemory, nBytes)) {
+      LogError("ShmemAndroid::Map():unmap");
+      mMemory = nullptr;
+      return false;
+    }
+  }
+
+  Mapped(nBytes);
+  return true;
+}
+
+void* SharedMemoryBasic::FindFreeAddressSpace(size_t size) {
+  void* memory =
+      mmap(NULL, size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+  munmap(memory, size);
+  return memory != (void*)-1 ? memory : NULL;
+}
+
+auto SharedMemoryBasic::CloneHandle() -> Handle {
+  MOZ_ASSERT(mShmFd >= 0, "Should have been Create()d by now");
+
+  int shmfdDup = dup(mShmFd);
+  if (-1 == shmfdDup) {
+    LogError("ShmemAndroid::CloneHandle()");
+    return nullptr;
+  }
+
+  return mozilla::UniqueFileHandle(shmfdDup);
+}
+
+void SharedMemoryBasic::Unmap() {
+  if (!mMemory) {
+    return;
+  }
+
+  if (munmap(mMemory, Size())) {
+    LogError("ShmemAndroid::Unmap()");
+  }
+  mMemory = nullptr;
+}
+
+void SharedMemoryBasic::CloseHandle() {
+  if (mShmFd != -1) {
+    close(mShmFd);
+    mShmFd = -1;
+    mOpenRights = RightsReadWrite;
+  }
+}
+
+}  // namespace ipc
+}  // namespace mozilla