1.7.4. Retrieve the Logical Data Link State

The GCIS_EXID_GETDLINKSTATE extension ID is used for retrieving the logical data link state (operable, inoperable or disabled) of the specified board device for PRI or station device for BRI.

The following table provides the parameter inputs for the gc_Extension( ) function.

Parameter	Input
target_type	GCTGT_GCLIB_CHAN
target_id	board device handle for PRI, station device handle for BRI
ext_id	GCIS_EXID_GETDLINKSTATE
parmblkp	set_id - GCIS_SET_DLINK
	parm_id - GCIS_PARM_DLINK_CES
	values - 0 for PRI 1-8 for BRI when used as a network-side terminal.
	value_type - char
	parm_id - GCIS_PARM_DLINK_SAPI
	values - 0 for BRI and PRI 16 for X.25 packets over D-channel
	value_type - char
retblkp	set_id - GCIS_SET_DLINK
	parm_id - GCIS_PARM_DLINK_STATE
	values - DATA_LINK_DOWN DATA_LINK_UP DATA_LINK_DISABLED
	value_type - int
mode	EV_SYNC

Example

 int extGetDLinkState (LINEDEV handle)
{
    GC_PARM_DATAP parm_datap;
    GC_PARM_BLKP parm_blkp = NULL, ret_blkp = NULL;
    unsigned long mode;
    int ret_val = 0;
    GC_INFO  t_Info;
    char sapi, ces;
    sapi = 0;
    gc_util_insert_parm_ref( &parm_blkp, GCIS_SET_DLINK, GCIS_PARM_DLINK_SAPI,
        sizeof( char ), &sapi);
     ces = 1;
    gc_util_insert_parm_ref( &parm_blkp, GCIS_SET_DLINK, GCIS_PARM_DLINK_CES,
        sizeof( char ), &ces);
     mode = EV_SYNC;
     ret_val = gc_Extension(GCTGT_GCLIB_CHAN, handle,
        GCIS_EXID_GETDLINKSTATE, parm_blkp, &ret_blkp, mode);
     if ( ret_val )
    {
           ret_val = gc_ErrorInfo(&t_Info);
           if (ret_val == GC_SUCCESS) {
                    printf("gc_ErrorInfo() successfully called\n");
                    PrintGC_INFO(&t_Info);
           } else {
                    printf("gc_ErrorInfo() call failed\n");
           }
    } 
    	  	 gc_util_delete_parm_blk( ret_blkp );
    gc_util_delete_parm_blk( parm_blkp );
    return ret_val;
}

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