106 lines
3.0 KiB
Prolog
106 lines
3.0 KiB
Prolog
/** uses SWI code
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<module> SICStus compatible socket library
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@tbd Our implementation does not support AF_UNIX sockets.
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@TBD Implement socket_select/5
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@see http://www.sics.se/sicstus/docs/3.7.1/html/sicstus_28.html
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*/
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:- module(yap_sockets,
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[ ip_socket/2, % +Domain, -Socket
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ip_socket/4, % +Domain, +Type, +Protocol, -Socket
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socket_close/1, % +Socket
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socket_bind/2, % +Socket, 'AF_INET'(+Host,+Port)
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tcp_socket_connect/3, % +Socket, 'AF_INET'(+Host,+Port), -Stream
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socket_listen/2, % +Socket, +Length
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socket_accept/2, % +Socket, -Stream
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socket_accept/3, % +Socket, -Client, -Stream
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% socket_select/5, % +TermsSockets, -NewTermsStreams,
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% +TimeOut, +Streams, -ReadStreams
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current_host/1, % ?HostName
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hostname_address/2 % ?HostName, ?HostAddress
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]).
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:- use_module(library(socket)).
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:- use_module(library(error)).
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:- use_module(library(apply)).
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%socket(+@var{DOMAIN},+@var{TYPE},+@var{PROTOCOL},-@var{SOCKET})
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ip_socket(Domain, 'SOCK_DGRAM', Protocol, SOCKET) :-
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must_be(oneof(['AF_INET']), Domain),
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must_be(oneof([0]), Protocol),
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udp_socket(SOCKET),
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assert(yap_socket(udp, SOCKET)).
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ip_socket(Domain, 'SOCK_STREAM', Protocol, SOCKET) :-
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must_be(oneof(['AF_INET']), Domain),
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must_be(oneof([0]), Protocol),
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tcp_socket(SOCKET),
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assert(yap_socket(tcp, SOCKET)).
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ip_socket(Domain, SOCK) :-
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socket(Domain, 'SOCK_STREAM', 0, SOCK).
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socket_close(Socket) :-
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retract(yap_socket(udp, Socket)), !.
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socket_close(Socket) :-
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retract(yap_socket(tcp, Socket)), !,
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tcp_close_socket(Socket).
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socket_bind(Socket, 'AF_INET'(Host,Port)) :-
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( Address = 'AF_INET'(Host, Port)
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-> true
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; type_error(socket_address, Address)
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),
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( var(Host)
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-> gethostname(Host)
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; true % Warning?
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),
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tcp_bind(Socket, Port).
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tcp_socket_connect(Socket, Address, StreamPair) :-
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( Address = 'AF_INET'(Host, Port)
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-> true
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; type_error(socket_address, Address)
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),
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tcp_connect(Socket, Host:Port),
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tcp_open_socket(Socket, Read, Write),
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stream_pair(StreamPair, Read, Write).
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socket_listen(SOCKET, BACKLOG) :-
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tcp_listen(SOCKET, BACKLOG).
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socket_accept(Socket, Client, StreamPair) :-
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tcp_accept(Socket, Socket2, Peer),
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peer_to_client(Peer, Client),
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tcp_open_socket(Socket2, Read, Write),
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stream_pair(StreamPair, Read, Write).
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socket_buffering(STREAM, _, CUR, NEW) :-
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stream_property(STREAM, buffer(Prop) ),
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translate_buffer(Prop, CUR),
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translate_buffer(NProp, NEW),
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stream_property(STREAM, buffer(NProp) ).
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translate_buffer(false, unbuf).
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translate_buffer(full, fullbuf).
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current_host(Host) :-
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gethostname(Host).
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hostname_address(Host, Address) :-
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nonvar(Host), !,
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tcp_host_to_address(Host, IP),
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peer_to_client(IP, Address).
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peer_to_client(ip(A,B,C,D), Client) :-
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Parts = [A,B,C,D],
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ground(Parts), !,
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atomic_list_concat(Parts, '.', Client).
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peer_to_client(ip(A,B,C,D), Client) :-
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atomic_list_concat(Parts, '.', Client),
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maplist(atom_number, Parts, Numbers),
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Numbers = [A,B,C,D].
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