Update NaCl's generator to support new wait APIs.

mojo/nacl/NOT_FOR_COMMIT/mojo_syscall.cc

+// 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.
+
+// WARNING this file was generated by generate_nacl_bindings.py
+// Do not edit by hand.
+
+#include "mojo/nacl/mojo_syscall.h"
+
+#include <stdio.h>
+
+#include "mojo/nacl/mojo_syscall_internal.h"
+#include "mojo/public/c/system/core.h"
+#include "native_client/src/public/chrome_main.h"
+#include "native_client/src/public/nacl_app.h"
+#include "native_client/src/trusted/desc/nacl_desc_custom.h"
+
+namespace {
+
+void MojoDescDestroy(void* handle) {
+}
+
+ssize_t MojoDescSendMsg(void* handle,
+                        const struct NaClImcTypedMsgHdr* msg,
+                        int flags) {
+  struct NaClApp* nap = static_cast<struct NaClApp*>(handle);
+
+  if (msg->iov_length != 1 || msg->ndesc_length != 0) {
+    return -1;
+  }
+
+  uint32_t volatile* params = static_cast<uint32_t volatile*>(msg->iov[0].base);
+  size_t num_params = msg->iov[0].length / sizeof(*params);
+
+  if (num_params < 1) {
+    return -1;
+  }
+
+  uint32_t msg_type = params[0];
+  switch (msg_type) {
+  case 0:
+    {
+      if (num_params != 5) {
+        return -1;
+      }
+      const struct MojoCreateSharedBufferOptions* options;
+      uint64_t num_bytes_value;
+      MojoHandle volatile* shared_buffer_handle_ptr;
+      MojoHandle shared_buffer_handle_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertExtensibleStructInput(nap, params[1], true, &options)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[2], &num_bytes_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[3], false, &shared_buffer_handle_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[4], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoCreateSharedBuffer(options, num_bytes_value, &shared_buffer_handle_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *shared_buffer_handle_ptr = shared_buffer_handle_value;
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 1:
+    {
+      if (num_params != 5) {
+        return -1;
+      }
+      MojoHandle buffer_handle_value;
+      const struct MojoDuplicateBufferHandleOptions* options;
+      MojoHandle volatile* new_buffer_handle_ptr;
+      MojoHandle new_buffer_handle_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &buffer_handle_value)) {
+          return -1;
+        }
+        if (!ConvertExtensibleStructInput(nap, params[2], true, &options)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[3], false, &new_buffer_handle_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[4], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoDuplicateBufferHandle(buffer_handle_value, options, &new_buffer_handle_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *new_buffer_handle_ptr = new_buffer_handle_value;
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 2:
+    {
+      if (num_params != 7) {
+        return -1;
+      }
+      MojoHandle buffer_handle_value;
+      uint64_t offset_value;
+      uint64_t num_bytes_value;
+      void* volatile* buffer_ptr;
+      void* buffer_value;
+      MojoMapBufferFlags flags_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &buffer_handle_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[2], &offset_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[3], &num_bytes_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[4], false, &buffer_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[5], &flags_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[6], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoMapBuffer(buffer_handle_value, offset_value, num_bytes_value, &buffer_value, flags_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *buffer_ptr = buffer_value;
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 3:
+    {
+      if (num_params != 3) {
+        return -1;
+      }
+      void* buffer_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &buffer_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[2], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoUnmapBuffer(buffer_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 4:
+    {
+      if (num_params != 5) {
+        return -1;
+      }
+      const struct MojoCreateDataPipeOptions* options;
+      MojoHandle volatile* data_pipe_producer_handle_ptr;
+      MojoHandle data_pipe_producer_handle_value;
+      MojoHandle volatile* data_pipe_consumer_handle_ptr;
+      MojoHandle data_pipe_consumer_handle_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertExtensibleStructInput(nap, params[1], true, &options)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[2], false, &data_pipe_producer_handle_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[3], false, &data_pipe_consumer_handle_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[4], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoCreateDataPipe(options, &data_pipe_producer_handle_value, &data_pipe_consumer_handle_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *data_pipe_producer_handle_ptr = data_pipe_producer_handle_value;
+        *data_pipe_consumer_handle_ptr = data_pipe_consumer_handle_value;
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 5:
+    {
+      if (num_params != 6) {
+        return -1;
+      }
+      MojoHandle data_pipe_producer_handle_value;
+      const void* elements;
+      uint32_t volatile* num_bytes_ptr;
+      uint32_t num_bytes_value;
+      MojoWriteDataFlags flags_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &data_pipe_producer_handle_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInOut(nap, params[3], false, &num_bytes_value, &num_bytes_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[4], &flags_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[5], false, &result_ptr)) {
+          return -1;
+        }
+        if (!ConvertArray(nap, params[2], num_bytes_value, 1, false, &elements)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoWriteData(data_pipe_producer_handle_value, elements, &num_bytes_value, flags_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *num_bytes_ptr = num_bytes_value;
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 6:
+    {
+      if (num_params != 6) {
+        return -1;
+      }
+      MojoHandle data_pipe_producer_handle_value;
+      void* volatile* buffer_ptr;
+      void* buffer_value;
+      uint32_t volatile* buffer_num_bytes_ptr;
+      uint32_t buffer_num_bytes_value;
+      MojoWriteDataFlags flags_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &data_pipe_producer_handle_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[2], false, &buffer_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarInOut(nap, params[3], false, &buffer_num_bytes_value, &buffer_num_bytes_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[4], &flags_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[5], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoBeginWriteData(data_pipe_producer_handle_value, &buffer_value, &buffer_num_bytes_value, flags_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *buffer_ptr = buffer_value;
+        *buffer_num_bytes_ptr = buffer_num_bytes_value;
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 7:
+    {
+      if (num_params != 4) {
+        return -1;
+      }
+      MojoHandle data_pipe_producer_handle_value;
+      uint32_t num_bytes_written_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &data_pipe_producer_handle_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[2], &num_bytes_written_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[3], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoEndWriteData(data_pipe_producer_handle_value, num_bytes_written_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 8:
+    {
+      if (num_params != 6) {
+        return -1;
+      }
+      MojoHandle data_pipe_consumer_handle_value;
+      void* elements;
+      uint32_t volatile* num_bytes_ptr;
+      uint32_t num_bytes_value;
+      MojoReadDataFlags flags_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &data_pipe_consumer_handle_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInOut(nap, params[3], false, &num_bytes_value, &num_bytes_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[4], &flags_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[5], false, &result_ptr)) {
+          return -1;
+        }
+        if (!ConvertArray(nap, params[2], num_bytes_value, 1, false, &elements)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoReadData(data_pipe_consumer_handle_value, elements, &num_bytes_value, flags_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *num_bytes_ptr = num_bytes_value;
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 9:
+    {
+      if (num_params != 6) {
+        return -1;
+      }
+      MojoHandle data_pipe_consumer_handle_value;
+      const void* volatile* buffer_ptr;
+      const void* buffer_value;
+      uint32_t volatile* buffer_num_bytes_ptr;
+      uint32_t buffer_num_bytes_value;
+      MojoReadDataFlags flags_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &data_pipe_consumer_handle_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[2], false, &buffer_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarInOut(nap, params[3], false, &buffer_num_bytes_value, &buffer_num_bytes_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[4], &flags_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[5], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoBeginReadData(data_pipe_consumer_handle_value, &buffer_value, &buffer_num_bytes_value, flags_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *buffer_ptr = buffer_value;
+        *buffer_num_bytes_ptr = buffer_num_bytes_value;
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 10:
+    {
+      if (num_params != 4) {
+        return -1;
+      }
+      MojoHandle data_pipe_consumer_handle_value;
+      uint32_t num_bytes_read_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &data_pipe_consumer_handle_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[2], &num_bytes_read_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[3], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoEndReadData(data_pipe_consumer_handle_value, num_bytes_read_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 11:
+    {
+      if (num_params != 2) {
+        return -1;
+      }
+      MojoTimeTicks volatile* result_ptr;
+      MojoTimeTicks result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarOutput(nap, params[1], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoGetTimeTicksNow();
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 12:
+    {
+      if (num_params != 3) {
+        return -1;
+      }
+      MojoHandle handle_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &handle_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[2], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoClose(handle_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 13:
+    {
+      if (num_params != 5) {
+        return -1;
+      }
+      MojoHandle handle_value;
+      MojoHandleSignals signals_value;
+      MojoDeadline deadline_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &handle_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[2], &signals_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[3], &deadline_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[4], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoWait(handle_value, signals_value, deadline_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 14:
+    {
+      if (num_params != 6) {
+        return -1;
+      }
+      const MojoHandle* handles;
+      const MojoHandleSignals* signals;
+      uint32_t num_handles_value;
+      MojoDeadline deadline_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[3], &num_handles_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[4], &deadline_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[5], false, &result_ptr)) {
+          return -1;
+        }
+        if (!ConvertArray(nap, params[1], num_handles_value, sizeof(*handles), false, &handles)) {
+          return -1;
+        }
+        if (!ConvertArray(nap, params[2], num_handles_value, sizeof(*signals), false, &signals)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoWaitMany(handles, signals, num_handles_value, deadline_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 15:
+    {
+      if (num_params != 6) {
+        return -1;
+      }
+      MojoHandle handle_value;
+      MojoHandleSignals signals_value;
+      MojoDeadline deadline_value;
+      MojoHandleSignalsState volatile* signals_state_ptr;
+      MojoHandleSignalsState signals_state_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &handle_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[2], &signals_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[3], &deadline_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[4], true, &signals_state_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[5], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoNewWait(handle_value, signals_value, deadline_value, signals_state_ptr ? &signals_state_value : NULL);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (signals_state_ptr != NULL) {
+          memcpy_volatile_out(signals_state_ptr, &signals_state_value, sizeof(MojoHandleSignalsState));
+        }
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 16:
+    {
+      if (num_params != 8) {
+        return -1;
+      }
+      const MojoHandle* handles;
+      const MojoHandleSignals* signals;
+      uint32_t num_handles_value;
+      MojoDeadline deadline_value;
+      uint32_t volatile* result_index_ptr;
+      uint32_t result_index_value;
+      MojoHandleSignalsState* signals_states;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[3], &num_handles_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[4], &deadline_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[5], true, &result_index_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[7], false, &result_ptr)) {
+          return -1;
+        }
+        if (!ConvertArray(nap, params[1], num_handles_value, sizeof(*handles), false, &handles)) {
+          return -1;
+        }
+        if (!ConvertArray(nap, params[2], num_handles_value, sizeof(*signals), false, &signals)) {
+          return -1;
+        }
+        if (!ConvertArray(nap, params[6], num_handles_value, sizeof(*signals_states), true, &signals_states)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoNewWaitMany(handles, signals, num_handles_value, deadline_value, result_index_ptr ? &result_index_value : NULL, signals_states);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (result_index_ptr != NULL) {
+          *result_index_ptr = result_index_value;
+        }
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 17:
+    {
+      if (num_params != 5) {
+        return -1;
+      }
+      const struct MojoCreateMessagePipeOptions* options;
+      MojoHandle volatile* message_pipe_handle0_ptr;
+      MojoHandle message_pipe_handle0_value;
+      MojoHandle volatile* message_pipe_handle1_ptr;
+      MojoHandle message_pipe_handle1_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertExtensibleStructInput(nap, params[1], true, &options)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[2], false, &message_pipe_handle0_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[3], false, &message_pipe_handle1_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[4], false, &result_ptr)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoCreateMessagePipe(options, &message_pipe_handle0_value, &message_pipe_handle1_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *message_pipe_handle0_ptr = message_pipe_handle0_value;
+        *message_pipe_handle1_ptr = message_pipe_handle1_value;
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 18:
+    {
+      if (num_params != 8) {
+        return -1;
+      }
+      MojoHandle message_pipe_handle_value;
+      const void* bytes;
+      uint32_t num_bytes_value;
+      const MojoHandle* handles;
+      uint32_t num_handles_value;
+      MojoWriteMessageFlags flags_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &message_pipe_handle_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[3], &num_bytes_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[5], &num_handles_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[6], &flags_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[7], false, &result_ptr)) {
+          return -1;
+        }
+        if (!ConvertArray(nap, params[2], num_bytes_value, 1, true, &bytes)) {
+          return -1;
+        }
+        if (!ConvertArray(nap, params[4], num_handles_value, sizeof(*handles), true, &handles)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoWriteMessage(message_pipe_handle_value, bytes, num_bytes_value, handles, num_handles_value, flags_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+  case 19:
+    {
+      if (num_params != 8) {
+        return -1;
+      }
+      MojoHandle message_pipe_handle_value;
+      void* bytes;
+      uint32_t volatile* num_bytes_ptr;
+      uint32_t num_bytes_value;
+      MojoHandle* handles;
+      uint32_t volatile* num_handles_ptr;
+      uint32_t num_handles_value;
+      MojoReadMessageFlags flags_value;
+      MojoResult volatile* result_ptr;
+      MojoResult result_value;
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (!ConvertScalarInput(nap, params[1], &message_pipe_handle_value)) {
+          return -1;
+        }
+        if (!ConvertScalarInOut(nap, params[3], true, &num_bytes_value, &num_bytes_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarInOut(nap, params[5], true, &num_handles_value, &num_handles_ptr)) {
+          return -1;
+        }
+        if (!ConvertScalarInput(nap, params[6], &flags_value)) {
+          return -1;
+        }
+        if (!ConvertScalarOutput(nap, params[7], false, &result_ptr)) {
+          return -1;
+        }
+        if (!ConvertArray(nap, params[2], num_bytes_value, 1, true, &bytes)) {
+          return -1;
+        }
+        if (!ConvertArray(nap, params[4], num_handles_value, sizeof(*handles), true, &handles)) {
+          return -1;
+        }
+      }
+
+      result_value = MojoReadMessage(message_pipe_handle_value, bytes, num_bytes_ptr ? &num_bytes_value : NULL, handles, num_handles_ptr ? &num_handles_value : NULL, flags_value);
+
+      {
+        ScopedCopyLock copy_lock(nap);
+        if (num_bytes_ptr != NULL) {
+          *num_bytes_ptr = num_bytes_value;
+        }
+        if (num_handles_ptr != NULL) {
+          *num_handles_ptr = num_handles_value;
+        }
+        *result_ptr = result_value;
+      }
+
+      return 0;
+    }
+
+  }
+
+  return -1;
+}
+
+ssize_t MojoDescRecvMsg(void* handle,
+                        struct NaClImcTypedMsgHdr* msg,
+                        int flags) {
+  return -1;
+}
+
+struct NaClDesc* MakeMojoDesc(struct NaClApp* nap) {
+  struct NaClDescCustomFuncs funcs = NACL_DESC_CUSTOM_FUNCS_INITIALIZER;
+  funcs.Destroy = MojoDescDestroy;
+  funcs.SendMsg = MojoDescSendMsg;
+  funcs.RecvMsg = MojoDescRecvMsg;
+  return NaClDescMakeCustomDesc(nap, &funcs);
+}
+
+void MojoDisabledDescDestroy(void* handle) {
+}
+
+ssize_t MojoDisabledDescSendMsg(void* handle,
+                                const struct NaClImcTypedMsgHdr* msg,
+                                int flags) {
+  fprintf(stderr, "Mojo is not currently supported.");
+  abort();
+}
+
+ssize_t MojoDisabledDescRecvMsg(void* handle,
+                                struct NaClImcTypedMsgHdr* msg,
+                                int flags) {
+  fprintf(stderr, "Mojo is not currently supported.");
+  abort();
+}
+
+struct NaClDesc* MakeDisabledMojoDesc(struct NaClApp* nap) {
+  struct NaClDescCustomFuncs funcs = NACL_DESC_CUSTOM_FUNCS_INITIALIZER;
+  funcs.Destroy = MojoDisabledDescDestroy;
+  funcs.SendMsg = MojoDisabledDescSendMsg;
+  funcs.RecvMsg = MojoDisabledDescRecvMsg;
+  return NaClDescMakeCustomDesc(nap, &funcs);
+}
+
+} // namespace
+
+// The value for this FD must not conflict with uses inside Chromium. However,
+// mojo/nacl doesn't depend on any Chromium headers, so we can't use a #define
+// from there.
+#define NACL_MOJO_DESC (NACL_CHROME_DESC_BASE + 3)
+
+void InjectMojo(struct NaClApp* nap) {
+  NaClAppSetDesc(nap, NACL_MOJO_DESC, MakeMojoDesc(nap));
+}
+
+void InjectDisabledMojo(struct NaClApp* nap) {
+  NaClAppSetDesc(nap, NACL_MOJO_DESC, MakeDisabledMojoDesc(nap));
+}