1# native_child_process.h 2 3 4## Overview 5 6The **native_child_process.h** file declares the APIs used to create a native child process and establish an IPC channel between the main process and child process. 7 8**Library**: libchild_process.so 9 10**System capability**: SystemCapability.Ability.AbilityRuntime.Core 11 12**Since**: 12 13 14**Related module**: [ChildProcess](c-apis-ability-childprocess.md) 15 16 17## Summary 18 19### Files 20 21| Name | Description | 22| ------------------------------------------------------ | -------------------------------------------------------------------------------------------------- | 23| [native_child_process.h](native__child__process_8h.md) | Declares the APIs used to create a native child process and establish an IPC channel between the main process and child process.<br>File to include: <AbilityKit/native_child_process.h><br>Library: libchild_process.so| 24 25### Types 26 27| Name | Description | 28| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ----------------- | 29| typedef enum Ability_NativeChildProcess_ErrCode [Ability_NativeChildProcess_ErrCode](c-apis-ability-childprocess.md#ability_nativechildprocess_errcode) | Defines an enum for the error codes used by the native child process module.| 30| typedef void(\* [OH_Ability_OnNativeChildProcessStarted](c-apis-ability-childprocess.md#oh_ability_onnativechildprocessstarted)) (int errCode, OHIPCRemoteProxy \*remoteProxy) | Defines a callback function for notifying the child process startup result.| 31 32 33### Enums 34 35| Name | Description | 36| -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------- | 37| [Ability_NativeChildProcess_ErrCode](c-apis-ability-childprocess.md#ability_nativechildprocess_errcode) {<br> NCP_NO_ERROR = 0,<br> NCP_ERR_INVALID_PARAM = 401,<br> NCP_ERR_NOT_SUPPORTED = 801,<br> NCP_ERR_INTERNAL = 16000050,<br> NCP_ERR_BUSY = 16010001,<br> NCP_ERR_TIMEOUT = 16010002,<br> NCP_ERR_SERVICE_ERROR = 16010003,<br> NCP_ERR_MULTI_PROCESS_DISABLED = 16010004,<br> NCP_ERR_ALREADY_IN_CHILD = 16010005,<br> NCP_ERR_MAX_CHILD_PROCESSES_REACHED = 16010006,<br> NCP_ERR_LIB_LOADING_FAILED = 16010007,<br> NCP_ERR_CONNECTION_FAILED = 16010008<br>} | Enumerates the error codes used by the native child process module.| 38 39 40### Functions 41 42| Name | Description | 43| ------------------------------------------------------------ | ------------------------------------------------------------ | 44| int [OH_Ability_CreateNativeChildProcess](c-apis-ability-childprocess.md#oh_ability_createnativechildprocess) (const char \*libName, [OH_Ability_OnNativeChildProcessStarted](c-apis-ability-childprocess.md#oh_ability_onnativechildprocessstarted) onProcessStarted) | Creates a child process, loads the specified dynamic library file, and returns the startup result asynchronously through a callback parameter. The callback notification is an independent thread. When implementing the callback function, pay attention to thread synchronization and do not perform time-consuming operations to avoid long-time blocking. | 45 46> **NOTE** 47> 48> Currently, only 2-in-1 devices are supported, and only one native child process can be started for a process.