openmpi/orte/mca/db/daemon/db_daemon_component.c

/*
 * Copyright (c) 2010      Cisco Systems, Inc.  All rights reserved. 
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 *
 * These symbols are in a file by themselves to provide nice linker
 * semantics.  Since linkers generally pull in symbols by object
 * files, keeping these symbols as the only symbols in this file
 * prevents utility programs such as "ompi_info" from having to import
 * entire components just to query their version and parameters.
 */

#include "orte_config.h"
#include "orte/constants.h"

#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif

#include "opal/mca/base/base.h"
#include "opal/mca/base/mca_base_param.h"

#include "orte/util/proc_info.h"

#include "orte/mca/db/db.h"
#include "orte/mca/db/base/base.h"
#include "db_daemon.h"

extern orte_db_base_module_t orte_db_daemon_module;
char *orte_db_daemon_directory;

/*
 * Instantiate the public struct with all of our public information
 * and pointers to our public functions in it
 */
orte_db_base_component_t mca_db_daemon_component = {
    {
        ORTE_DB_BASE_VERSION_1_0_0,

        /* Component name and version */
        "daemon",
        ORTE_MAJOR_VERSION,
        ORTE_MINOR_VERSION,
        ORTE_RELEASE_VERSION,

        /* Component open and close functions */
        orte_db_daemon_component_open,
        orte_db_daemon_component_close,
        orte_db_daemon_component_query
    },
    {
        /* The component is checkpoint ready */
        MCA_BASE_METADATA_PARAM_CHECKPOINT
    }
};


int
orte_db_daemon_component_open(void)
{
    return ORTE_SUCCESS;
}

/* only select us if specifically requested */
int orte_db_daemon_component_query(mca_base_module_t **module, int *priority)
{
    char *req;
    
    if (NULL != (req = getenv("OMPI_MCA_db"))) {
        if (0 == strcasecmp(req, "daemon")) {
            *priority = 100;
            *module = (mca_base_module_t*)&orte_db_daemon_module;
            return ORTE_SUCCESS;
        }
    }
    
    *priority = 0;
    *module = NULL;
    return ORTE_ERROR;
}


int
orte_db_daemon_component_close(void)
{
    return ORTE_SUCCESS;
}