OFBinding(3sadm)

OFBinding -- bind a class description table

Synopsis

CC ... -lsysadm -lvtcl -ltclx -ltcl -lsocket -lgen -lm

#include <scoadmin/osaStdDef.h>

void OFBinding(errStatusPtr, className, attributes, attributeCount,
               groups, groupCount, operations, operationCount,
               requestProcessor, osaDataPtr)

Description

This procedure allows C/C++ to bind a class description table (CDT) to the SCOadmin services library connection. After such a binding the SCOadmin services library can look into the class's CDT and call the appropriate OSA defined procedures.

Arguments

errStatus_cl *errStatusPtr: A pointer to the error stack data structure. If an error occurs the appropriate error will be placed in the error stack. This data can be referenced using the library functions associated with the error stack.
className_pt className: A pointer to the string containing the name of the class being described.
OSAAttr_t attributes[]: An array of attribute descriptions that outline all the attributes in the class being bound.
unsigned int attributeCount: A count of the number of attributes described in the previous array parameter.
OSAGroup_t groups[]: An array of group descriptions that outline all the groups in the class being bound.
unsigned int groupCount: A count of the number of groups described in the previous array parameter.
OSAOp_t operations[]: An array of operation descriptions that outline all the operations in the class being bound.
unsigned int operationCount: A count of the number of operations described in the previous array parameter.
ofRequestProcessor_ftp requestProcessor: A pointer to the optional requestProcessor() routine supplied by the OSA class. Set to NULL if no such routine is supplied.
void *osaDataPtr: A handle to any data segment that the OSA wishes to assign to a specific class. Set to NULL if not used.

OFBinding needs three tables describing the attributes, groups and operations that compose a class. It also needs a formal name for the class so that invokers of the class will have some sort of handle on it. The tables that the class needs are described in the sections that follow.

Attribute table

struct OSAAttr_t {
    attributeName_pt  name;
    attributeToken_t  token;
    char             *validOperations;
    filterToken_t     validFilters;
    OSACheckBit_t     dataType;
}

These describe each attribute that can be accessed by this class. The fields in the OSAAttr_t are defined in the following way. attributeName_pt name is the name by which the users of the OSA will identify the attribute. The attributeToken_t token is an integer by which the OSA itself will identify the attribute when it gets or returns data to or from the SCOadmin services library. The char *validOperations is an string list of all the operations (besides create) which are allowed to work on this attribute. create is always allowed to work on any attribute (have that attribute include in the command line passed from the client). The filterToken_t validFilters is a union of all the valid filter operations that are allowed to reference this attribute. The filterToken_ts are defined in the <scoadmin/osaStdDef.h> file. The OSACheckBit_t dataType is a union of either ATTR_SINGLE or ATTR_SET and ATTR_LONG, ATTR_DOUBLE, or ATTR_STRING. This describes the type of data that the attribute contains.

Group table

struct OSAGroup_t {
    attributeName_pt  name;
    char             *assocAttrs;
}

These described the all the attribute groups that can be accessed by users of the class being bound. Any of the attributes listed in the OSAAttr_t table can be grouped together and referenced as one for convince sake. Only the Get and Replace-with-default actions can work on grouped attributes. The two fields in the OSAGroup_t arrays are as follows. The attributeName_pt name field represents what the users of the OSA will access the group of attributes by. The char *assocAttrs is a list of attributes found in the OSAAttr_t table which the SCOadmin services library will substitute the group name for before calling any OSA functions.

Operation table

struct OSAOp_t {
    operationName_pt       name;
    executionProcedure_fpt executionProcedure;
    OSACheckBit_t          callPerAttribute;
}

This table defines all the operations that users of the class can call on. Each operations must list how it is to be called by the user (operationName_pt name), what C/C++ function the SCOadmin services library should call when the operation is to be performed (executionProcedure_fpt executionProcedure), and in what synchronization the procedure should be called (OSACheckBit_t callPerAttribute, which should contain either OP_PER_ATTR or OP_PER_OBJECT).

The OFBinding routine also allows the OSA to specify an request processor to handle incoming BMIP requests. If the OSA needs to perform such specialized functions as containment, synchronization, scoping or first pass validation; then it should provide a request processor and point to its location with this parameter.

The OFBinding routine also allows the OSA to attach a void pointer with every declared class. This pointer can point to anything, and is a useful way for multiple classes that are identical in function but not in data to be created. Simply call OFBinding once for each class, with the osaDataPtr pointing to different data storage areas. This variable is never examined by the SCO services library, and is forwarded to all functions in the OSA called by the library.

Diagnostics

The procedure can return the following errors:

CDT_DUPLICATE_CLASS_NAMES: The function has been called more than once and a previous invocation has used the same className value.
CDT_MISSING_OP_EXECPROC: The variable executionProcedure_fpt executionProcedure has been left NULL in the OSAOp_t description of one of the operations.
CDT_MISSING_FILTER_EXECPROC: The variable executionProcedure_fpt executionProcedure has been left NULL in the OSAOp_t description of the filter operation.
CDT_EMPTY_OPERATION_LIST: The operation array OSAOp_t operations[] is empty and contains no data.
CDT_CORRUPT_ATTR_OP_LIST: The list of operations in OSAAttr_t's char *validOperations variable can not be interpreted by OFBinding().
CDT_ATTR_NAMES_UNRECOGNIZED_OP: One of the operations listed in the OSAAttr_t's char *validOperations variable is not listed in the OSAOp_t array.
CDT_CORRUPT_GROUP_ATTR_LIST: The list of attributes in OSAGroup_t's char *assocAttrs variable can not be interpreted by OFBinding().
CDT_GROUP_NAMES_UNRECOGNIZED_ATTR: One of the attributes listed in the OSAGroup_t's char *assocAttrs variable is not listed in the OSAAttr_t array.
CDT_EMPTY_ATTRIBUTE_LIST: The attribute array OSAAttr_t attributes[] is empty and contains no data.

References

OFEvaluateFilter(3sadm)