1# ipc_cskeleton.h 2 3 4## Overview 5 6Provides C interfaces for managing the token IDs, credentials, process IDs (PIDs), user IDs (UIDs), and thread pool in the IPC framework. 7 8**Library**: libipc_capi.so 9 10**System capability**: SystemCapability.Communication.IPC.Core 11 12**Since**: 12 13 14**Related module**: [OHIPCSkeleton](_o_h_i_p_c_skeleton.md) 15 16 17## Summary 18 19 20### Functions 21 22| Name| Description| 23| -------- | -------- | 24| void [OH_IPCSkeleton_JoinWorkThread](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_joinworkthread) (void) | Joints this thread to the IPC worker thread pool.| 25| void [OH_IPCSkeleton_StopWorkThread](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_stopworkthread) (void) | Stops this thread.| 26| uint64_t [OH_IPCSkeleton_GetCallingTokenId](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_getcallingtokenid) (void) | Obtains the caller token ID. This API must be called in the IPC context. Otherwise, the token ID is returned.| 27| uint64_t [OH_IPCSkeleton_GetFirstTokenId](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_getfirsttokenid) (void) | Obtain the token ID of the first invoker.| 28| uint64_t [OH_IPCSkeleton_GetSelfTokenId](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_getselftokenid) (void) | Obtain the local token ID.| 29| uint64_t [OH_IPCSkeleton_GetCallingPid](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_getcallingpid) (void) | Obtains the caller PID. This API must be called in the IPC context. Otherwise, the current PID is returned.| 30| uint64_t [OH_IPCSkeleton_GetCallingUid](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_getcallinguid) (void) | Obtains the caller UID. This API must be called in the IPC context. Otherwise, the current UID is returned.| 31| int [OH_IPCSkeleton_IsLocalCalling](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_islocalcalling) (void) | Checks whether a local calling is being made.| 32| int [OH_IPCSkeleton_SetMaxWorkThreadNum](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_setmaxworkthreadnum) (const int maxThreadNum) | Sets the maximum number of worker threads.| 33| int [OH_IPCSkeleton_ResetCallingIdentity](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_resetcallingidentity) (char \*\*identity, int32_t \*len, [OH_IPC_MemAllocator](_o_h_i_p_c_parcel.md#oh_ipc_memallocator) allocator) | Resets the caller identity credential (including the token ID, UID, and PID) to that of this process and returns the caller credential information. The credential information is used in **OH_IPCSkeleton_SetCallingIdentity**.| 34| int [OH_IPCSkeleton_SetCallingIdentity](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_setcallingidentity) (const char \*identity) | Sets the caller credential information to the IPC context.| 35| int [OH_IPCSkeleton_IsHandlingTransaction](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_ishandlingtransaction) (void) | Checks whether an IPC request is being handled.| 36