Support creating mojo peer connections from named pipes.

mojo/edk/embedder/platform_channel_utils_posix.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_
 #define MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_
 
 #include <stddef.h>
 #include <sys/types.h>  // For |ssize_t|.
 
 #include <deque>
 #include <memory>
 
 #include "mojo/edk/embedder/platform_handle.h"
 #include "mojo/edk/system/system_impl_export.h"
 
 struct iovec;  // Declared in <sys/uio.h>.
 
 namespace mojo {
 namespace edk {
+class ScopedPlatformHandle;
 
 // The maximum number of handles that can be sent "at once" using
 // |PlatformChannelSendmsgWithHandles()|. This must be less than the Linux
 // kernel's SCM_MAX_FD which is 253.
 const size_t kPlatformChannelMaxNumHandles = 128;
 
 // Use these to write to a socket created using |PlatformChannelPair| (or
 // equivalent). These are like |write()| and |writev()|, but handle |EINTR| and
 // never raise |SIGPIPE|. (Note: On Mac, the suppression of |SIGPIPE| is set up
 // by |PlatformChannelPair|.)
@@ skipping 32 matching lines @@
 // Wrapper around |recvmsg()|, which will extract any attached file descriptors
 // (in the control message) to |PlatformHandle|s (and append them to
 // |platform_handles|). (This also handles |EINTR|.)
 MOJO_SYSTEM_IMPL_EXPORT ssize_t
 PlatformChannelRecvmsg(PlatformHandle h,
                        void* buf,
                        size_t num_bytes,
                        std::deque<PlatformHandle>* platform_handles,
                        bool block = false);
 
+// Returns false if |server_handle| encounters an unrecoverable error.
+// Returns true if it's valid to keep listening on |server_handle|. In this
+// case, it's possible that a connection wasn't successfully established; then,
+// |connection_handle| will be invalid.
+bool ServerAcceptConnection(PlatformHandle server_handle,
+                            ScopedPlatformHandle* connection_handle);
+
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_