import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

ipc/glue/SharedMemoryBasic_android.cpp

@@ -0,0 +1,139 @@
+/* -*- 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"
+
+//
+// Temporarily go directly to the kernel interface until we can
+// interact better with libcutils.
+//
+#include <linux/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)
+{ }
+
+SharedMemoryBasic::~SharedMemoryBasic()
+{
+  Unmap();
+  CloseHandle();
+}
+
+bool
+SharedMemoryBasic::SetHandle(const Handle& aHandle)
+{
+  MOZ_ASSERT(-1 == mShmFd, "Already Create()d");
+  mShmFd = aHandle.fd;
+  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 = open("/" ASHMEM_NAME_DEF, O_RDWR, 0600);
+  if (-1 == shmfd) {
+    LogError("ShmemAndroid::Create():open");
+    return false;
+  }
+
+  if (ioctl(shmfd, ASHMEM_SET_SIZE, aNbytes)) {
+    LogError("ShmemAndroid::Unmap():ioctl(SET_SIZE)");
+    close(shmfd);
+    return false;
+  }
+
+  mShmFd = shmfd;
+  Created(aNbytes);
+  return true;
+}
+
+bool
+SharedMemoryBasic::Map(size_t nBytes)
+{
+  MOZ_ASSERT(nullptr == mMemory, "Already Map()d");
+
+  mMemory = mmap(nullptr, nBytes,
+                 PROT_READ | PROT_WRITE,
+                 MAP_SHARED,
+                 mShmFd,
+                 0);
+  if (MAP_FAILED == mMemory) {
+    LogError("ShmemAndroid::Map()");
+    mMemory = nullptr;
+    return false;
+  }
+
+  Mapped(nBytes);
+  return true;
+}
+
+bool
+SharedMemoryBasic::ShareToProcess(base::ProcessId/*unused*/,
+                                  Handle* aNewHandle)
+{
+  MOZ_ASSERT(mShmFd >= 0, "Should have been Create()d by now");
+
+  int shmfdDup = dup(mShmFd);
+  if (-1 == shmfdDup) {
+    LogError("ShmemAndroid::ShareToProcess()");
+    return false;
+  }
+
+  aNewHandle->fd = shmfdDup;
+  aNewHandle->auto_close = true;
+  return true;
+}
+
+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;
+  }
+}
+
+} // namespace ipc
+} // namespace mozilla