## 12.6.8. User Defined Functions

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`typedef int MPI_Comm_copy_attr_function(MPI_Comm oldcomm, int comm_keyval, void *extra_state, void *attribute_val_in, void *attribute_val_out, int *flag);
` `typedef int MPI_Comm_delete_attr_function(MPI_Comm comm, int comm_keyval, void *attribute_val, void *extra_state);
` `typedef void MPI_Comm_errhandler_fn(MPI_Comm *, int *, ...);
` `typedef int MPI_Datarep_conversion_function(void *userbuf, MPI_Datatype datatype, int count, void *filebuf, MPI_Offset position, void *extra_state);
` `typedef int MPI_Datarep_extent_function(MPI_Datatype datatype, MPI_Aint *file_extent, void *extra_state);
` `typedef void MPI_File_errhandler_fn(MPI_File *, int *, ...);
` `typedef int MPI_Grequest_cancel_function(void *extra_state, int complete);
` `typedef int MPI_Grequest_free_function(void *extra_state);
` `typedef int MPI_Grequest_query_function(void *extra_state, MPI_Status *status);
` `typedef int MPI_Type_copy_attr_function(MPI_Datatype oldtype, int type_keyval, void *extra_state, void *attribute_val_in, void *attribute_val_out, int *flag);
` `typedef int MPI_Type_delete_attr_function(MPI_Datatype type, int type_keyval, void *attribute_val, void *extra_state);
` `typedef int MPI_Win_copy_attr_function(MPI_Win oldwin, int win_keyval, void *extra_state, void *attribute_val_in, void *attribute_val_out, int *flag);
` `typedef int MPI_Win_delete_attr_function(MPI_Win win, int win_keyval, void *attribute_val, void *extra_state);
` `typedef void MPI_Win_errhandler_fn(MPI_Win *, int *, ...);
`

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MPI-2.0 of July 18, 1997
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