Revert "Move mojo edk into mojo/edk"

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 "base/memory/scoped_ptr.h"
-#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 embedder {
-
-// The maximum number of handles that can be sent "at once" using
-// |PlatformChannelSendmsgWithHandles()|.
-// TODO(vtl): This number is taken from ipc/file_descriptor_set_posix.h:
-// |FileDescriptorSet::kMaxDescriptorsPerMessage|. Where does it come from?
-const size_t kPlatformChannelMaxNumHandles = 7;
-
-// 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|.)
-MOJO_SYSTEM_IMPL_EXPORT ssize_t
-    PlatformChannelWrite(PlatformHandle h, const void* bytes, size_t num_bytes);
-MOJO_SYSTEM_IMPL_EXPORT ssize_t
-    PlatformChannelWritev(PlatformHandle h, struct iovec* iov, size_t num_iov);
-
-// Writes data, and the given set of |PlatformHandle|s (i.e., file descriptors)
-// over the Unix domain socket given by |h| (e.g., created using
-// |PlatformChannelPair()|). All the handles must be valid, and there must be at
-// least one and at most |kPlatformChannelMaxNumHandles| handles. The return
-// value is as for |sendmsg()|, namely -1 on failure and otherwise the number of
-// bytes of data sent on success (note that this may not be all the data
-// specified by |iov|). (The handles are not closed, regardless of success or
-// failure.)
-MOJO_SYSTEM_IMPL_EXPORT ssize_t
-    PlatformChannelSendmsgWithHandles(PlatformHandle h,
-                                      struct iovec* iov,
-                                      size_t num_iov,
-                                      PlatformHandle* platform_handles,
-                                      size_t num_platform_handles);
-
-// TODO(vtl): Remove this once I've switched things over to
-// |PlatformChannelSendmsgWithHandles()|.
-// Sends |PlatformHandle|s (i.e., file descriptors) over the Unix domain socket
-// (e.g., created using PlatformChannelPair|). (These will be sent in a single
-// message having one null byte of data and one control message header with all
-// the file descriptors.) All of the handles must be valid, and there must be at
-// most |kPlatformChannelMaxNumHandles| (and at least one handle). Returns true
-// on success, in which case it closes all the handles.
-MOJO_SYSTEM_IMPL_EXPORT bool PlatformChannelSendHandles(PlatformHandle h,
-                                                        PlatformHandle* handles,
-                                                        size_t num_handles);
-
-// 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);
-
-}  // namespace embedder
-}  // namespace mojo
-
-#endif  // MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_