MPI_Info_get_valuelen(3) Retrieves the length of the key value associated with an info object.

SYNTAX

C Syntax

#include <mpi.h>
int MPI_Info_get_valuelen(MPI_Info info, const char *key,
        int *valuelen, int *flag)

Fortran Syntax

INCLUDE 'mpif.h'
MPI_INFO_GET_VALUELEN(INFO, KEY, VALUELEN, FLAG, IERROR)
        INTEGER         INFO, VALUELEN, IERROR 
        LOGICAL         FLAG
        CHARACTER*(*)   KEY

C++ Syntax

#include <mpi.h>
bool MPI::Info::Get_valuelen(const char* key, int& valuelen) 
        const

INPUT PARAMETERS

info
Info object (handle).
key
Key (string).

OUTPUT PARAMETERS

valuelen
Length of value arg (integer).
flag
Returns true if key defined, false if not (boolean).
IERROR
Fortran only: Error status (integer).

DESCRIPTION

MPI_Info_get_valuelen retrieves the length of the value associated with key. If key is defined, valuelen is set to the length of its associated value and flag is set to true. If key is not defined, valuelen is not touched and flag is set to false. The length returned in C or C++ does not include the end-of-string character.

If key is larger than MPI_MAX_INFO_KEY, the call is erroneous.

ERRORS

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI::Exception object.

Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

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