eSNMP API Routines

*_set Routine

Load the response OID back into the method routine’s VARBIND structure. Set the method->varbindfield with the OID of the actual MIB variable instance you are returning. This is usually accomplished by loading an array of integers with the instance OID you wish to return and calling the instance2OID support routine.

Load the response data back into the method routine’s VARBIND structure.

Use one of the support routines with the corresponding data type to load the method->varbindfield with the data to return:

o_integer

o_string

o_octet

o_oid

These routines make a copy of the data you specify. The libesnmp function manages any memory associated with copied data. The method routine must manage the original data’s memory.

The routine does any necessary conversions to the type defined in the object table for the MIB variable and copies the converted data into the method->varbindfield. See Section 5.2.3 for information on data value representation.

Return the correct status value, as follows:

ESNMP_MTHD_noError

The routine completed successfully or

 

no errors were found.

ESNMP_MTHD_noSuchInstance

There is no such instance of the

 

requested object.

ESNMP_MTHD_noSuchObject

No such object exists.

ESNMP_MTHD_ genErr

An error occurred and the routine did

 

not complete successfully.

5.2.3 Value Representation

The values in a VARBIND structure for each data type are represented as follows. (Refer to the ESNMP.H file for a definition of the OCT and OID structures.)

ESNMP_TYPE_Integer32 (varbind->value.slfield)

This is a 32-bit signed integer. Use the o_integer routine to insert an integer value into the VARBIND structure. Note that the prototype for the value argument is unsigned long; therefore, you may need to cast this to a signed integer.

ESNMP_TYPE_DisplayString, ESNMP_TYPE_Opaque ESNMP_TYPE_OctetString (varbind->value.octfield)

This is an octet string. It is contained in the VARBIND structure as an OCT structure that contains a length and a pointer to a dynamically allocated character array.

eSNMP API Routines 5–27

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Compaq AAR04BCTE manual Value Representation, Ointeger Ostring Ooctet Ooid

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