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Gettable socket option requirements

In the table below, X denotes a socket option class, a denotes a value of X, p denotes a value that meets the protocol requirements, and u denotes an identifier.

Table12.GettableSocketOption requirements

expression

type

assertion/note
pre/post-conditions

a.level(p);

int

Returns a value suitable for passing as the level argument to POSIX getsockopt() (or equivalent).

a.name(p);

int

Returns a value suitable for passing as the option_name argument to POSIX getsockopt() (or equivalent).

a.data(p);

a pointer, convertible to void*

Returns a pointer suitable for passing as the option_value argument to POSIX getsockopt() (or equivalent).

a.size(p);

size_t

Returns a value suitable for passing as the option_len argument to POSIX getsockopt() (or equivalent), after appropriate integer conversion has been performed.

a.resize(p, s);

post: a.size(p) == s.
Passed the value contained in the option_len argument to POSIX getsockopt() (or equivalent) after successful completion of the function. Permitted to throw an exception if the socket option object a does not support the specified size.



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