This repository has been archived on 2023-08-20. You can view files and clone it, but cannot push or open issues or pull requests.
yap-6.3/pl/sockets.yap
2001-09-03 16:05:59 +00:00

82 lines
2.7 KiB
Prolog
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: sockets.yap *
* Last rev: *
* mods: *
* comments: Socket predicates *
* *
*************************************************************************/
socket(S,D) :-
socket(S, 'SOCK_STREAM', 0, D).
socket_accept(S,F) :-
socket_accept(S, _, F).
socket_select(Socks, OutSocks, TimeOut, Streams, OutStreams) :-
'$check_list'(Socks, socket_select(Socks, OutSocks, TimeOut, Streams, OutStreams)),
'$check_list'(Streams, socket_select(Socks, OutSocks, TimeOut, Streams, OutStreams)),
'$select_cp_fds'(Socks, Streams, Fds),
'$check_select_time'(TimeOut, Sec, USec, socket_select(Socks, OutSocks, TimeOut, Streams, OutStreams)),
'$socket_select'(Fds, Sec, USec, NFds),
'$cp_socket_fds'(Socks, NFds, OutSocks, NFdsS),
'$cp_stream_fds'(Streams, NFdsS, OutStreams).
/* check whether a list of options is valid */
'$check_list'(V,G) :- var(V), !,
throw(error(instantiation_error,G)).
'$check_list'([],_) :- !.
'$check_list'([Opt|T],G) :- !,
  '$check_list'(T,G).
'$check_io_opts'(T,G) :-
throw(error(type_error(list,T),G)).
'$select_cp_fds'([], Fds, Fds).
'$select_cp_fds'([_-Fd|L], Fds0, [Fd|Fds]) :-
'$select_cp_fds'(L, Fds0, Fds).
'$check_select_time'(V, Sec, USec, Goal) :-
var(V), !,
throw(error(instantiation_error,G)).
'$check_select_time'(off, -1, -1, _).
'$check_select_time'(Sec0:Usec0, Sec, USec, _) :-
Sec is Sec0,
Usec0 is Usec,
Sec > 0, USec > 0.
'$cp_socket_fds'([], Fds, [], Fds).
'$cp_socket_fds'([_|Scks], [[]|Fds], Out, StrFds) :- !,
'$cp_socket_fds'(Scks, Fds, Out, StrFds).
'$cp_socket_fds'([T-Socket|Scks], [Socket|Fds], [T-connection(Client,Stream)|Out], StrFds) :-
socket_accept(Socket, Client, Stream),
'$cp_socket_fds'(Scks, Fds, Out, StrFds).
'$cp_stream_fds'([], Fds, []).
'$cp_stream_fds'([_|Strs], [[]|Fds], Out) :- !,
'$cp_stream_fds'(Strs, Fds, Out).
'$cp_stream_fds'([Stream|Strs], [Stream|Fds], [Stream|Out]) :-
'$cp_stream_fds'(Strs, Fds, Out).
socket_buffering(Sock, Flag, InSize, OutSize) :-
var(OutSize), OutSize \= InSize, !,
throw(error(instantiation_error,socket_buffering(Sock, Flag, InSize, OutSize))).
socket_buffering(Sock, Flag, InSize, OutSize) :-
'$convert_sock_buff'(InSize, InNumb),
'$socket_buffering'(Sock, Flag, InNumb, OutNumb),
'$convert_sock_buff'(OutSize, OutNumb).
'$convert_sock_buff'(unbuf, 1) :- !.
'$convert_sock_buff'(fullbuf, InNumb).