tcp_bind(Socket, localhost:8080)
If Port is unbound, the system picks an arbitrary free port and unifies Port with the selected port number. Port is either an integer or the name of a registered service. See also tcp_connect/4.
af_unix if Socket
is an AF_UNIX socket (see
unix_domain_socket/1).
tcp_socket(Socket),
tcp_connect(Socket, Host:Port),
tcp_open_socket(Socket, StreamPair)
Typical client applications should use the high level interface provided by tcp_connect/3 which avoids resource leaking if a step in the process fails, and can be hooked to support proxies. For example:
setup_call_cleanup(
tcp_connect(Host:Port, StreamPair, []),
talk(StreamPair),
close(StreamPair))
If SocketId is an AF_UNIX socket (see unix_domain_socket/1), Address is an atom or string denoting a file name.
:- 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).
tcp_connect(+Address, -StreamPair, +Options).false. If true, do not attempt to
use any proxies to obtain the connectionfalse. If true, set nodelay on the
resulting socket using tcp_setopt(Socket, nodelay)The +,+,- mode is deprecated and does not support proxies. It behaves like tcp_connect/4, but creates a stream pair (see stream_pair/3).
| Address | is either a Host:Port term or a file name (atom or string). The latter connects to an AF_UNIX socket and requires unix_domain_socket/1. |
proxy_error(tried(ResultList)) is raised by mode (+,-,+) if
proxies are defines by proxy_for_url/3
but no proxy can establsh the connection. ResultList contains
one or more terms of the form
false(Proxy) for a hook that simply failed or error(Proxy, ErrorTerm)
for a hook that raised an exception.library(http/http_proxy) defines a hook that allows to
connect through HTTP proxies that support the CONNECT
method.select()
call underlying wait_for_input/3. As input
multiplexing typically happens in a background thread anyway we accept
the loss of timeouts and interrupts.
library(http/http_open))
collect the results of failed proxies and raise an exception no proxy is
capable of realizing the connection.
The default implementation recognises the values for Proxy
described below. The library(http/http_proxy) adds
proxy(Host,Port) which allows for HTTP proxies using the
CONNECT method.
These correspond to the proxy methods defined by PAC Proxy auto-config. Additional methods can be returned if suitable clauses for http:http_connection_over_proxy/6 or try_proxy/4 are defined.
setsockopt()
and the socket interface (e.g.,
socket(7) on Linux) for details.
tcp_socket(Socket), tcp_setopt(Socket, bindtodevice(lo))
true, disable the Nagle optimization on this socket,
which is enabled by default on almost all modern TCP/IP stacks. The
Nagle optimization joins small packages, which is generally desirable,
but sometimes not. Please note that the underlying TCP_NODELAY setting
to setsockopt() is not available on all platforms and
systems may require additional privileges to change this option. If the
option is not supported, tcp_setopt/2
raises a domain_error exception. See
Wikipedia
for details.setsockopt() with the
corresponding arguments.swipl-win.exe
executable) this flags defines whether or not any events are dispatched
on behalf of the user interface. Default is
true. Only very specific situations require setting this to false.fcntl() call. Currently only suitable to
deal switch stream to non-blocking mode using:
tcp_fcntl(Stream, setfl, nonblock),
An attempt to read from a non-blocking stream while there is no data
available returns -1 (or end_of_file for read/1),
but
at_end_of_stream/1 fails. On actual
end-of-input,
at_end_of_stream/1 succeeds.
domain_error
exception.
getaddrinfo()
and the IP-number is unified to Address using a term of the
format
ip(Byte1,Byte2,Byte3,Byte4). Otherwise, if Address
is bound to an ip(Byte1,Byte2,Byte3,Byte4) term, it is
resolved by
gethostbyaddr() and the canonical hostname is unified with
HostName.
gethostname() and return the canonical name
returned by getaddrinfo().
ip(A,B,C,D) : portsocks_error(Details) if the SOCKS negotiation failed.