83 lines
2.8 KiB
Prolog
83 lines
2.8 KiB
Prolog
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: sockets.yap *
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* Last rev: *
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* mods: *
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* comments: Socket predicates *
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* *
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*************************************************************************/
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socket(S,D) :-
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socket(S, 'SOCK_STREAM', 0, D).
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socket_accept(S,F) :-
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socket_accept(S, _, F).
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socket_select(Socks, OutSocks, TimeOut, Streams, OutStreams) :-
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'$check_list_for_sockets'(Socks, socket_select(Socks, OutSocks, TimeOut, Streams, OutStreams)),
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'$check_list_for_sockets'(Streams, socket_select(Socks, OutSocks, TimeOut, Streams, OutStreams)),
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'$select_cp_fds'(Socks, Streams, Fds),
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'$check_select_time'(TimeOut, Sec, USec, socket_select(Socks, OutSocks, TimeOut, Streams, OutStreams)),
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'$socket_select'(Fds, Sec, USec, NFds),
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'$cp_socket_fds'(Socks, NFds, OutSocks, NFdsS),
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'$cp_stream_fds'(Streams, NFdsS, OutStreams).
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/* check whether a list of options is valid */
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'$check_list_for_sockets'(V,G) :- var(V), !,
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'$do_error'(instantiation_error,G).
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'$check_list_for_sockets'([],_) :- !.
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'$check_list_for_sockets'([_|T],G) :- !,
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'$check_list_for_sockets'(T,G).
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'$check_list_for_sockets'(T,G) :-
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'$do_error'(type_error(list,T),G).
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'$select_cp_fds'([], Fds, Fds).
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'$select_cp_fds'([_-Fd|L], Fds0, [Fd|Fds]) :-
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'$select_cp_fds'(L, Fds0, Fds).
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'$check_select_time'(V, _, _, Goal) :-
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var(V), !,
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'$do_error'(instantiation_error,Goal).
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'$check_select_time'(off, -1, -1, _).
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'$check_select_time'(Sec0:USec0, Sec, USec, _) :-
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Sec is Sec0,
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USec is USec0,
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Sec >= 0, USec >= 0.
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'$cp_socket_fds'([], Fds, [], Fds).
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'$cp_socket_fds'([_|Scks], [[]|Fds], Out, StrFds) :- !,
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'$cp_socket_fds'(Scks, Fds, Out, StrFds).
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'$cp_socket_fds'([T-Socket|Scks], [Socket|Fds], [T-connection(Client,Stream)|Out], StrFds) :-
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socket_accept(Socket, Client, Stream),
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'$cp_socket_fds'(Scks, Fds, Out, StrFds).
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'$cp_stream_fds'([], _, []).
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'$cp_stream_fds'([_|Strs], [[]|Fds], Out) :- !,
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'$cp_stream_fds'(Strs, Fds, Out).
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'$cp_stream_fds'([Stream|Strs], [Stream|Fds], [Stream|Out]) :-
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'$cp_stream_fds'(Strs, Fds, Out).
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socket_buffering(Sock, Flag, InSize, OutSize) :-
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var(OutSize), OutSize \= InSize, !,
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'$do_error'(instantiation_error,socket_buffering(Sock, Flag, InSize, OutSize)).
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socket_buffering(Sock, Flag, InSize, OutSize) :-
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'$convert_sock_buff'(OutSize, OutNumb),
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'$socket_buffering'(Sock, Flag, InNumb, OutNumb),
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'$convert_sock_buff'(InSize, InNumb).
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'$convert_sock_buff'(V, V) :- var(V), !.
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'$convert_sock_buff'(unbuf, 1) :- !.
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'$convert_sock_buff'(fullbuf, _).
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