mpi file open

1#include <mpi.h>
2int MPI_File_open(MPI_Comm comm, const char *filename,
3    int amode, MPI_Info info,
4    MPI_File *fh)
5 //MPI_File_open opens the file identified by the filename filename on all
6  //processes in the comm communicator group. 
7  //MPI_File_open is a collective routine; 
8  //all processes must provide the same value for amode, 
9  //and all processes must provide filenames that reference the same file 
10  //which are textually identical