import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

ipc/glue/Transport_posix.cpp

@@ -0,0 +1,93 @@
+/* -*- 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 <unistd.h>
+
+#include <string>
+
+#include "base/eintr_wrapper.h"
+
+#include "mozilla/ipc/Transport.h"
+#include "mozilla/ipc/FileDescriptor.h"
+#include "ProtocolUtils.h"
+
+using namespace std;
+
+using base::ProcessHandle;
+
+namespace mozilla {
+namespace ipc {
+
+nsresult
+CreateTransport(base::ProcessId aProcIdOne,
+                TransportDescriptor* aOne,
+                TransportDescriptor* aTwo)
+{
+  wstring id = IPC::Channel::GenerateVerifiedChannelID(std::wstring());
+  // Use MODE_SERVER to force creation of the socketpair
+  Transport t(id, Transport::MODE_SERVER, nullptr);
+  int fd1 = t.GetFileDescriptor();
+  int fd2, dontcare;
+  t.GetClientFileDescriptorMapping(&fd2, &dontcare);
+  if (fd1 < 0 || fd2 < 0) {
+    return NS_ERROR_TRANSPORT_INIT;
+  }
+
+  // The Transport closes these fds when it goes out of scope, so we
+  // dup them here
+  fd1 = dup(fd1);
+  if (fd1 < 0) {
+    AnnotateCrashReportWithErrno("IpcCreateTransportDupErrno", errno);
+  }
+  fd2 = dup(fd2);
+  if (fd2 < 0) {
+    AnnotateCrashReportWithErrno("IpcCreateTransportDupErrno", errno);
+  }
+
+  if (fd1 < 0 || fd2 < 0) {
+    HANDLE_EINTR(close(fd1));
+    HANDLE_EINTR(close(fd2));
+    return NS_ERROR_DUPLICATE_HANDLE;
+  }
+
+  aOne->mFd = base::FileDescriptor(fd1, true/*close after sending*/);
+  aTwo->mFd = base::FileDescriptor(fd2, true/*close after sending*/);
+  return NS_OK;
+}
+
+UniquePtr<Transport>
+OpenDescriptor(const TransportDescriptor& aTd, Transport::Mode aMode)
+{
+  return MakeUnique<Transport>(aTd.mFd.fd, aMode, nullptr);
+}
+
+UniquePtr<Transport>
+OpenDescriptor(const FileDescriptor& aFd, Transport::Mode aMode)
+{
+  auto rawFD = aFd.ClonePlatformHandle();
+  return MakeUnique<Transport>(rawFD.release(), aMode, nullptr);
+}
+
+TransportDescriptor
+DuplicateDescriptor(const TransportDescriptor& aTd)
+{
+  TransportDescriptor result = aTd;
+  result.mFd.fd = dup(aTd.mFd.fd);
+  if (result.mFd.fd == -1) {
+    AnnotateSystemError();
+  }
+  MOZ_RELEASE_ASSERT(result.mFd.fd != -1, "DuplicateDescriptor failed");
+  return result;
+}
+
+void
+CloseDescriptor(const TransportDescriptor& aTd)
+{
+  close(aTd.mFd.fd);
+}
+
+} // namespace ipc
+} // namespace mozilla