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// 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.
// Note: This header should be compilable as C.
#ifndef MOJO_PUBLIC_PLATFORM_NATIVE_SYSTEM_THUNKS_H_
#define MOJO_PUBLIC_PLATFORM_NATIVE_SYSTEM_THUNKS_H_
#include <stddef.h>
#include <stdint.h>
#include "mojo/public/c/system/core.h"
// The embedder needs to bind the basic Mojo Core functions of a DSO to those of
// the embedder when loading a DSO that is dependent on mojo_system.
// The typical usage would look like:
// base::ScopedNativeLibrary app_library(
// base::LoadNativeLibrary(app_path_, &error));
// typedef MojoResult (*MojoSetSystemThunksFn)(MojoSystemThunks*);
// MojoSetSystemThunksFn mojo_set_system_thunks_fn =
// reinterpret_cast<MojoSetSystemThunksFn>(app_library.GetFunctionPointer(
// "MojoSetSystemThunks"));
// MojoSystemThunks system_thunks = MojoMakeSystemThunks();
// size_t expected_size = mojo_set_system_thunks_fn(&system_thunks);
// if (expected_size > sizeof(MojoSystemThunks)) {
// LOG(ERROR)
// << "Invalid DSO. Expected MojoSystemThunks size: "
// << expected_size;
// break;
// }
// Structure used to bind the basic Mojo Core functions of a DSO to those of
// the embedder.
// This is the ABI between the embedder and the DSO. It can only have new
// functions added to the end. No other changes are supported.
#pragma pack(push, 8)
struct MojoSystemThunks {
size_t size; // Should be set to sizeof(MojoSystemThunks).
MojoTimeTicks (*GetTimeTicksNow)();
MojoResult (*Close)(MojoHandle handle);
MojoResult (*Wait)(MojoHandle handle,
MojoHandleSignals signals,
MojoDeadline deadline,
struct MojoHandleSignalsState* signals_state);
MojoResult (*WaitMany)(const MojoHandle* handles,
const MojoHandleSignals* signals,
uint32_t num_handles,
MojoDeadline deadline,
uint32_t* result_index,
struct MojoHandleSignalsState* signals_states);
MojoResult (*CreateMessagePipe)(
const struct MojoCreateMessagePipeOptions* options,
MojoHandle* message_pipe_handle0,
MojoHandle* message_pipe_handle1);
MojoResult (*WriteMessage)(MojoHandle message_pipe_handle,
const void* bytes,
uint32_t num_bytes,
const MojoHandle* handles,
uint32_t num_handles,
MojoWriteMessageFlags flags);
MojoResult (*ReadMessage)(MojoHandle message_pipe_handle,
void* bytes,
uint32_t* num_bytes,
MojoHandle* handles,
uint32_t* num_handles,
MojoReadMessageFlags flags);
MojoResult (*CreateDataPipe)(const struct MojoCreateDataPipeOptions* options,
MojoHandle* data_pipe_producer_handle,
MojoHandle* data_pipe_consumer_handle);
MojoResult (*WriteData)(MojoHandle data_pipe_producer_handle,
const void* elements,
uint32_t* num_elements,
MojoWriteDataFlags flags);
MojoResult (*BeginWriteData)(MojoHandle data_pipe_producer_handle,
void** buffer,
uint32_t* buffer_num_elements,
MojoWriteDataFlags flags);
MojoResult (*EndWriteData)(MojoHandle data_pipe_producer_handle,
uint32_t num_elements_written);
MojoResult (*ReadData)(MojoHandle data_pipe_consumer_handle,
void* elements,
uint32_t* num_elements,
MojoReadDataFlags flags);
MojoResult (*BeginReadData)(MojoHandle data_pipe_consumer_handle,
const void** buffer,
uint32_t* buffer_num_elements,
MojoReadDataFlags flags);
MojoResult (*EndReadData)(MojoHandle data_pipe_consumer_handle,
uint32_t num_elements_read);
MojoResult (*CreateSharedBuffer)(
const struct MojoCreateSharedBufferOptions* options,
uint64_t num_bytes,
MojoHandle* shared_buffer_handle);
MojoResult (*DuplicateBufferHandle)(
MojoHandle buffer_handle,
const struct MojoDuplicateBufferHandleOptions* options,
MojoHandle* new_buffer_handle);
MojoResult (*MapBuffer)(MojoHandle buffer_handle,
uint64_t offset,
uint64_t num_bytes,
void** buffer,
MojoMapBufferFlags flags);
MojoResult (*UnmapBuffer)(void* buffer);
MojoResult (*CreateWaitSet)(MojoHandle* wait_set);
MojoResult (*AddHandle)(MojoHandle wait_set,
MojoHandle handle,
MojoHandleSignals signals);
MojoResult (*RemoveHandle)(MojoHandle wait_set,
MojoHandle handle);
MojoResult (*GetReadyHandles)(MojoHandle wait_set,
uint32_t* count,
MojoHandle* handles,
MojoResult* results,
struct MojoHandleSignalsState* signals_states);
MojoResult (*Watch)(MojoHandle handle,
MojoHandleSignals signals,
MojoWatchCallback callback,
uintptr_t context);
MojoResult (*CancelWatch)(MojoHandle handle, uintptr_t context);
MojoResult (*FuseMessagePipes)(MojoHandle handle0, MojoHandle handle1);
};
#pragma pack(pop)
#ifdef __cplusplus
// Intended to be called from the embedder. Returns a |MojoCore| initialized
// to contain pointers to each of the embedder's MojoCore functions.
inline MojoSystemThunks MojoMakeSystemThunks() {
MojoSystemThunks system_thunks = {sizeof(MojoSystemThunks),
MojoGetTimeTicksNow,
MojoClose,
MojoWait,
MojoWaitMany,
MojoCreateMessagePipe,
MojoWriteMessage,
MojoReadMessage,
MojoCreateDataPipe,
MojoWriteData,
MojoBeginWriteData,
MojoEndWriteData,
MojoReadData,
MojoBeginReadData,
MojoEndReadData,
MojoCreateSharedBuffer,
MojoDuplicateBufferHandle,
MojoMapBuffer,
MojoUnmapBuffer,
MojoCreateWaitSet,
MojoAddHandle,
MojoRemoveHandle,
MojoGetReadyHandles,
MojoWatch,
MojoCancelWatch,
MojoFuseMessagePipes};
return system_thunks;
}
#endif
// Use this type for the function found by dynamically discovering it in
// a DSO linked with mojo_system. For example:
// MojoSetSystemThunksFn mojo_set_system_thunks_fn =
// reinterpret_cast<MojoSetSystemThunksFn>(app_library.GetFunctionPointer(
// "MojoSetSystemThunks"));
// The expected size of |system_thunks} is returned.
// The contents of |system_thunks| are copied.
typedef size_t (*MojoSetSystemThunksFn)(
const struct MojoSystemThunks* system_thunks);
#endif // MOJO_PUBLIC_PLATFORM_NATIVE_SYSTEM_THUNKS_H_
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