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        A type X meets the SettableSocketOption requirements
        if it satisfies the requirements listed below.
      
        In the table below, a denotes a (possibly const) value of type
        X, p denotes a (possibly const) value that meets
        the Protocol
        requirements, and u denotes an identifier.
      
Table 26. SettableSocketOption requirements for extensible implementations
| expression | type | 
                  assertion/note | 
|---|---|---|
| 
                   | 
                   | 
                  Returns a value suitable for passing as the level
                  argument to POSIX  | 
| 
                   | 
                   | 
                  Returns a value suitable for passing as the option_name
                  argument to POSIX  | 
| 
                   | 
                   | 
                  Returns a pointer suitable for passing as the option_value
                  argument to POSIX  | 
| 
                   | 
                   | 
                  Returns a value suitable for passing as the option_len
                  argument to POSIX  |