.TH MPI_File_open 3 "11/12/2019" " " "MPI"

.SH NAME

MPI_File_open \-  Opens a file 

.SH SYNOPSIS

.nf

int MPI_File_open(MPI_Comm comm, ROMIO_CONST char *filename, int amode,

MPI_Info info, MPI_File * fh)

.fi

.SH INPUT PARAMETERS

.PD 0

.TP

.B comm 

- communicator (handle)

.PD 1

.PD 0

.TP

.B filename 

- name of file to open (string)

.PD 1

.PD 0

.TP

.B amode 

- file access mode (integer)

.PD 1

.PD 0

.TP

.B info 

- info object (handle)

.PD 1

.SH OUTPUT PARAMETERS

.PD 0

.TP

.B fh 

- file handle (handle)

.PD 1

.SH NOTES FOR FORTRAN

All MPI routines in Fortran (except for 

.I MPI_WTIME

and 

.I MPI_WTICK

) have

an additional argument 

.I ierr

at the end of the argument list.  

.I ierr

is an integer and has the same meaning as the return value of the routine

in C.  In Fortran, MPI routines are subroutines, and are invoked with the

.I call

statement.

All MPI objects (e.g., 

.I MPI_Datatype

, 

.I MPI_Comm

) are of type 

.I INTEGER

in Fortran.