Revert "Move mojo edk into mojo/edk"

mojo/edk/embedder/platform_channel_utils_posix.cc

Index: mojo/edk/embedder/platform_channel_utils_posix.cc
diff --git a/mojo/edk/embedder/platform_channel_utils_posix.cc b/mojo/edk/embedder/platform_channel_utils_posix.cc
deleted file mode 100644
index 61b573bda4bf431d8e320dd3c0329becd28c2abf..0000000000000000000000000000000000000000
--- a/mojo/edk/embedder/platform_channel_utils_posix.cc
+++ /dev/null
@@ -1,186 +0,0 @@
-// 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.
-
-#include "mojo/edk/embedder/platform_channel_utils_posix.h"
-
-#include <sys/socket.h>
-#include <sys/uio.h>
-#include <unistd.h>
-
-#include "base/logging.h"
-#include "base/posix/eintr_wrapper.h"
-#include "build/build_config.h"
-
-namespace mojo {
-namespace embedder {
-
-// On Linux, |SIGPIPE| is suppressed by passing |MSG_NOSIGNAL| to
-// |send()|/|sendmsg()|. (There is no way of suppressing |SIGPIPE| on
-// |write()|/|writev().) On Mac, |SIGPIPE| is suppressed by setting the
-// |SO_NOSIGPIPE| option on the socket.
-//
-// Performance notes:
-//  - On Linux, we have to use |send()|/|sendmsg()| rather than
-//    |write()|/|writev()| in order to suppress |SIGPIPE|. This is okay, since
-//    |send()| is (slightly) faster than |write()| (!), while |sendmsg()| is
-//    quite comparable to |writev()|.
-//  - On Mac, we may use |write()|/|writev()|. Here, |write()| is considerably
-//    faster than |send()|, whereas |sendmsg()| is quite comparable to
-//    |writev()|.
-//  - On both platforms, an appropriate |sendmsg()|/|writev()| is considerably
-//    faster than two |send()|s/|write()|s.
-//  - Relative numbers (minimum real times from 10 runs) for one |write()| of
-//    1032 bytes, one |send()| of 1032 bytes, one |writev()| of 32+1000 bytes,
-//    one |sendmsg()| of 32+1000 bytes, two |write()|s of 32 and 1000 bytes, two
-//    |send()|s of 32 and 1000 bytes:
-//    - Linux: 0.81 s, 0.77 s, 0.87 s, 0.89 s, 1.31 s, 1.22 s
-//    - Mac: 2.21 s, 2.91 s, 2.98 s, 3.08 s, 3.59 s, 4.74 s
-
-// Flags to use with calling |send()| or |sendmsg()| (see above).
-#if defined(OS_MACOSX)
-const int kSendFlags = 0;
-#else
-const int kSendFlags = MSG_NOSIGNAL;
-#endif
-
-ssize_t PlatformChannelWrite(PlatformHandle h,
-                             const void* bytes,
-                             size_t num_bytes) {
-  DCHECK(h.is_valid());
-  DCHECK(bytes);
-  DCHECK_GT(num_bytes, 0u);
-
-#if defined(OS_MACOSX)
-  return HANDLE_EINTR(write(h.fd, bytes, num_bytes));
-#else
-  return send(h.fd, bytes, num_bytes, kSendFlags);
-#endif
-}
-
-ssize_t PlatformChannelWritev(PlatformHandle h,
-                              struct iovec* iov,
-                              size_t num_iov) {
-  DCHECK(h.is_valid());
-  DCHECK(iov);
-  DCHECK_GT(num_iov, 0u);
-
-#if defined(OS_MACOSX)
-  return HANDLE_EINTR(writev(h.fd, iov, static_cast<int>(num_iov)));
-#else
-  struct msghdr msg = {};
-  msg.msg_iov = iov;
-  msg.msg_iovlen = num_iov;
-  return HANDLE_EINTR(sendmsg(h.fd, &msg, kSendFlags));
-#endif
-}
-
-ssize_t PlatformChannelSendmsgWithHandles(PlatformHandle h,
-                                          struct iovec* iov,
-                                          size_t num_iov,
-                                          PlatformHandle* platform_handles,
-                                          size_t num_platform_handles) {
-  DCHECK(iov);
-  DCHECK_GT(num_iov, 0u);
-  DCHECK(platform_handles);
-  DCHECK_GT(num_platform_handles, 0u);
-  DCHECK_LE(num_platform_handles, kPlatformChannelMaxNumHandles);
-
-  char cmsg_buf[CMSG_SPACE(kPlatformChannelMaxNumHandles * sizeof(int))];
-  struct msghdr msg = {};
-  msg.msg_iov = iov;
-  msg.msg_iovlen = num_iov;
-  msg.msg_control = cmsg_buf;
-  msg.msg_controllen = CMSG_LEN(num_platform_handles * sizeof(int));
-  struct cmsghdr* cmsg = CMSG_FIRSTHDR(&msg);
-  cmsg->cmsg_level = SOL_SOCKET;
-  cmsg->cmsg_type = SCM_RIGHTS;
-  cmsg->cmsg_len = CMSG_LEN(num_platform_handles * sizeof(int));
-  for (size_t i = 0; i < num_platform_handles; i++) {
-    DCHECK(platform_handles[i].is_valid());
-    reinterpret_cast<int*>(CMSG_DATA(cmsg))[i] = platform_handles[i].fd;
-  }
-
-  return HANDLE_EINTR(sendmsg(h.fd, &msg, kSendFlags));
-}
-
-bool PlatformChannelSendHandles(PlatformHandle h,
-                                PlatformHandle* handles,
-                                size_t num_handles) {
-  DCHECK(handles);
-  DCHECK_GT(num_handles, 0u);
-  DCHECK_LE(num_handles, kPlatformChannelMaxNumHandles);
-
-  // Note: |sendmsg()| fails on Mac if we don't write at least one character.
-  struct iovec iov = {const_cast<char*>(""), 1};
-  char cmsg_buf[CMSG_SPACE(kPlatformChannelMaxNumHandles * sizeof(int))];
-  struct msghdr msg = {};
-  msg.msg_iov = &iov;
-  msg.msg_iovlen = 1;
-  msg.msg_control = cmsg_buf;
-  msg.msg_controllen = CMSG_LEN(num_handles * sizeof(int));
-  struct cmsghdr* cmsg = CMSG_FIRSTHDR(&msg);
-  cmsg->cmsg_level = SOL_SOCKET;
-  cmsg->cmsg_type = SCM_RIGHTS;
-  cmsg->cmsg_len = CMSG_LEN(num_handles * sizeof(int));
-  for (size_t i = 0; i < num_handles; i++) {
-    DCHECK(handles[i].is_valid());
-    reinterpret_cast<int*>(CMSG_DATA(cmsg))[i] = handles[i].fd;
-  }
-
-  ssize_t result = HANDLE_EINTR(sendmsg(h.fd, &msg, kSendFlags));
-  if (result < 1) {
-    DCHECK_EQ(result, -1);
-    return false;
-  }
-
-  for (size_t i = 0; i < num_handles; i++)
-    handles[i].CloseIfNecessary();
-  return true;
-}
-
-ssize_t PlatformChannelRecvmsg(PlatformHandle h,
-                               void* buf,
-                               size_t num_bytes,
-                               std::deque<PlatformHandle>* platform_handles) {
-  DCHECK(buf);
-  DCHECK_GT(num_bytes, 0u);
-  DCHECK(platform_handles);
-
-  struct iovec iov = {buf, num_bytes};
-  char cmsg_buf[CMSG_SPACE(kPlatformChannelMaxNumHandles * sizeof(int))];
-  struct msghdr msg = {};
-  msg.msg_iov = &iov;
-  msg.msg_iovlen = 1;
-  msg.msg_control = cmsg_buf;
-  msg.msg_controllen = sizeof(cmsg_buf);
-
-  ssize_t result = HANDLE_EINTR(recvmsg(h.fd, &msg, MSG_DONTWAIT));
-  if (result < 0)
-    return result;
-
-  // Success; no control messages.
-  if (msg.msg_controllen == 0)
-    return result;
-
-  DCHECK(!(msg.msg_flags & MSG_CTRUNC));
-
-  for (cmsghdr* cmsg = CMSG_FIRSTHDR(&msg); cmsg;
-       cmsg = CMSG_NXTHDR(&msg, cmsg)) {
-    if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
-      size_t payload_length = cmsg->cmsg_len - CMSG_LEN(0);
-      DCHECK_EQ(payload_length % sizeof(int), 0u);
-      size_t num_fds = payload_length / sizeof(int);
-      const int* fds = reinterpret_cast<int*>(CMSG_DATA(cmsg));
-      for (size_t i = 0; i < num_fds; i++) {
-        platform_handles->push_back(PlatformHandle(fds[i]));
-        DCHECK(platform_handles->back().is_valid());
-      }
-    }
-  }
-
-  return result;
-}
-
-}  // namespace embedder
-}  // namespace mojo