/usr/lib/swi-prolog/library/socket.pl is in swi-prolog-nox 6.6.6-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 | /* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@vu.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2013, University of Amsterdam
VU University Amsterdam
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/
:- module(socket,
[ tcp_socket/1, % -Socket
tcp_close_socket/1, % +Socket
tcp_open_socket/3, % +Socket, -Read, -Write
tcp_connect/2, % +Socket, +Address
tcp_connect/3, % +Socket, +Address, -StreamPair
tcp_connect/4, % +Socket, +Address, -Read, -Write)
tcp_bind/2, % +Socket, +Address
tcp_accept/3, % +Master, -Slave, -PeerName
tcp_listen/2, % +Socket, +BackLog
tcp_fcntl/3, % +Socket, +Command, ?Arg
tcp_setopt/2, % +Socket, +Option
tcp_host_to_address/2, % ?HostName, ?Ip-nr
tcp_select/3, % +Inputs, -Ready, +Timeout
gethostname/1, % -HostName
tcp_open_socket/2, % +Socket, -StreamPair
udp_socket/1, % -Socket
udp_receive/4, % +Socket, -Data, -Sender, +Options
udp_send/4 % +Socket, +Data, +Sender, +Options
]).
:- use_module(library(shlib)).
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
These predicates are documented in the source-distribution of the package
`clib'. See also the SWI-Prolog home-page at http://www.swi-prolog.org
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
:- use_foreign_library(foreign(socket), install_socket).
:- public tcp_debug/1. % set debugging.
%% tcp_open_socket(+Socket, -Stream) is det.
%
% Create streams to communicate to Socket. If Socket is a master
% socket (see tcp_bind/2), Stream should be used for tcp_accept/3.
% If Socket is a connected (see tcp_connect/2) or accepted socket
% (see tcp_accept/3), Stream is unified to a stream pair (see
% stream_pair/3) that can be used for reading and writing. The
% pair must be closed with close/1, which also closes the Socket.
tcp_open_socket(Socket, Stream) :-
tcp_open_socket(Socket, In, Out),
( var(Out)
-> Stream = In
; stream_pair(Stream, In, Out)
).
/*******************************
* HOOKABLE CONNECT *
*******************************/
%% tcp_connect(+Socket, +Address, -Read, -Write) is det.
%
% Connect a (client) socket to Address and return a bi-directional
% connection through the stream-handles Read and Write. This
% predicate may be hooked by defining socket:tcp_connect_hook/4
% with the same signature. Hooking can be used to deal with proxy
% connections. E.g.,
%
% ==
% :- multifile socket:tcp_connect_hook/4.
%
% socket:tcp_connect_hook(Socket, Address, Read, Write) :-
% proxy(ProxyAdress),
% tcp_connect(Socket, ProxyAdress),
% tcp_open_socket(Socket, Read, Write),
% proxy_connect(Address, Read, Write).
% ==
%
% @deprecated New code should use tcp_connect/3.
:- multifile
tcp_connect_hook/3,
tcp_connect_hook/4.
tcp_connect(Socket, Address, Read, Write) :-
tcp_connect_hook(Socket, Address, Read, Write), !.
tcp_connect(Socket, Address, Read, Write) :-
tcp_connect(Socket, Address),
tcp_open_socket(Socket, Read, Write).
%% tcp_connect(+Socket, +Address, -StreamPair) is det.
%
% As tcp_connect/4, but creates a stream pair (see stream_pair/3).
% The main advantage of having a single handle is that it is much
% easier to safely close the handles. If two handles need to be
% closed, the user must be careful to close the second handle if
% closing the first one raises an exception.
tcp_connect(Socket, Address, StreamPair) :-
tcp_connect_hook(Socket, Address, StreamPair0), !,
StreamPair = StreamPair0.
tcp_connect(Socket, Address, StreamPair) :-
tcp_connect(Socket, Address, Read, Write),
stream_pair(StreamPair, Read, Write).
/*******************************
* COMPATIBILITY *
*******************************/
tcp_fcntl(Socket, setfl, nonblock) :- !,
tcp_setopt(Socket, nonblock).
/*******************************
* HANDLE MESSAGES *
*******************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
The C-layer generates exceptions of the following format, where Message
is extracted from the operating system.
error(socket_error(Message), _)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
:- multifile
prolog:message/3.
prolog:message(error(socket_error(Message), _)) -->
[ 'Socket error: ~w'-[Message] ].
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