1e41f4b71Sopenharmony_ci# ipc_cskeleton.h 2e41f4b71Sopenharmony_ci 3e41f4b71Sopenharmony_ci 4e41f4b71Sopenharmony_ci## Overview 5e41f4b71Sopenharmony_ci 6e41f4b71Sopenharmony_ciProvides C interfaces for managing the token IDs, credentials, process IDs (PIDs), user IDs (UIDs), and thread pool in the IPC framework. 7e41f4b71Sopenharmony_ci 8e41f4b71Sopenharmony_ci**Library**: libipc_capi.so 9e41f4b71Sopenharmony_ci 10e41f4b71Sopenharmony_ci**System capability**: SystemCapability.Communication.IPC.Core 11e41f4b71Sopenharmony_ci 12e41f4b71Sopenharmony_ci**Since**: 12 13e41f4b71Sopenharmony_ci 14e41f4b71Sopenharmony_ci**Related module**: [OHIPCSkeleton](_o_h_i_p_c_skeleton.md) 15e41f4b71Sopenharmony_ci 16e41f4b71Sopenharmony_ci 17e41f4b71Sopenharmony_ci## Summary 18e41f4b71Sopenharmony_ci 19e41f4b71Sopenharmony_ci 20e41f4b71Sopenharmony_ci### Functions 21e41f4b71Sopenharmony_ci 22e41f4b71Sopenharmony_ci| Name| Description| 23e41f4b71Sopenharmony_ci| -------- | -------- | 24e41f4b71Sopenharmony_ci| void [OH_IPCSkeleton_JoinWorkThread](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_joinworkthread) (void) | Joints this thread to the IPC worker thread pool. | 25e41f4b71Sopenharmony_ci| void [OH_IPCSkeleton_StopWorkThread](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_stopworkthread) (void) | Stops this thread. | 26e41f4b71Sopenharmony_ci| uint64_t [OH_IPCSkeleton_GetCallingTokenId](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_getcallingtokenid) (void) | Obtains the token ID of the caller. This function must be called in the IPC context. Otherwise, the local token ID is returned. | 27e41f4b71Sopenharmony_ci| uint64_t [OH_IPCSkeleton_GetFirstTokenId](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_getfirsttokenid) (void) | Obtain the token ID of the first invoker. | 28e41f4b71Sopenharmony_ci| uint64_t [OH_IPCSkeleton_GetSelfTokenId](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_getselftokenid) (void) | Obtain the local token ID. | 29e41f4b71Sopenharmony_ci| uint64_t [OH_IPCSkeleton_GetCallingPid](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_getcallingpid) (void) | Obtains the PID of the caller. This function must be called in the IPC context. Otherwise, the local PID is returned. | 30e41f4b71Sopenharmony_ci| uint64_t [OH_IPCSkeleton_GetCallingUid](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_getcallinguid) (void) | Obtains the UID of the caller. This function must be called in the IPC context. Otherwise, the local UID is returned. | 31e41f4b71Sopenharmony_ci| int [OH_IPCSkeleton_IsLocalCalling](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_islocalcalling) (void) | Checks whether a local calling is being made. | 32e41f4b71Sopenharmony_ci| int [OH_IPCSkeleton_SetMaxWorkThreadNum](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_setmaxworkthreadnum) (const int maxThreadNum) | Sets the maximum number of worker threads. | 33e41f4b71Sopenharmony_ci| 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**. | 34e41f4b71Sopenharmony_ci| 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. | 35e41f4b71Sopenharmony_ci| int [OH_IPCSkeleton_IsHandlingTransaction](_o_h_i_p_c_skeleton.md#oh_ipcskeleton_ishandlingtransaction) (void) | Checks whether an IPC request is being handled. | 36