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Inside Macintosh: Networking With Open Transport / Part 2 - Open Transport Reference

Chapter 25 - Option Management Reference / Constants and Data Types

Action Flags

The req parameter to the OTOptionManagement function contains a flags field that you set to specify what action the function should take. The constant names that you can specify for this field are given by the following enumeration:

enum
   {
      T_NEGOTIATE = 0x004,
      T_CHECK     = 0x008,
      T_DEFAULT   = 0x010,
      T_CURRENT   = 0x080,
   };

Constant descriptions

T_NEGOTIATE

Negotiate the option values specified in the opt.buf field of the req parameter.

The overall result of the negotiation is specified by the flags field of the ret parameter. The opt.buf field of the ret parameter points to a buffer where negotiated values for each option are placed.

T_CHECK

Verify whether the endpoint supports the options referenced by the opt.buf field of the req parameter.

The overall result of the verification is specified by the flags field of the ret parameter. Specific verification results are returned in the opt.buf field of the ret parameter.

T_DEFAULT

Retrieve the default value for those options in the buffer referenced by the req->opt.buf field. To retrieve default values for all the options supported by an endpoint, include just the option T_ALLOPT in the options buffer.

Option values are returned in the opt.buf field of the ret parameter.

T_CURRENT

Retrieve the current value for those options that the endpoint supports and that are specified in the buffer referenced by the req->opt.buf field. To retrieve current values for all the options that an endpoint supports, include just the option T_ALLOPT in the options buffer.

Option values are returned in the opt.buf field of the ret parameter.