class TCPSocket
TCPSocket
represents a TCP/IP client socket.
A simple client may look like:
require 'socket' s = TCPSocket.new 'localhost', 2000 while line = s.gets # Read lines from socket puts line # and print them end s.close # close socket when done
Public Class Methods
Use Addrinfo.getaddrinfo
instead. This method is deprecated for the following reasons:
-
The 3rd element of the result is the address family of the first address. The address families of the rest of the addresses are not returned.
-
gethostbyname() may take a long time and it may block other threads. (GVL cannot be released since gethostbyname() is not thread safe.)
-
This method uses gethostbyname() function already removed from POSIX.
This method lookups host information by hostname.
TCPSocket.gethostbyname("localhost") #=> ["localhost", ["hal"], 2, "127.0.0.1"]
static VALUE tcp_s_gethostbyname(VALUE obj, VALUE host) { rb_warn("TCPSocket.gethostbyname is deprecated; use Addrinfo.getaddrinfo instead."); struct rb_addrinfo *res = rsock_addrinfo(host, Qnil, AF_UNSPEC, SOCK_STREAM, AI_CANONNAME); return rsock_make_hostent(host, res, tcp_sockaddr); }
Opens a TCP connection to remote_host
on remote_port
. If local_host
and local_port
are specified, then those parameters are used on the local end to establish the connection.
- :connect_timeout
-
specify the timeout in seconds.
static VALUE tcp_init(int argc, VALUE *argv, VALUE sock) { VALUE remote_host, remote_serv; VALUE local_host, local_serv; VALUE opt; static ID keyword_ids[2]; VALUE kwargs[2]; VALUE resolv_timeout = Qnil; VALUE connect_timeout = Qnil; if (!keyword_ids[0]) { CONST_ID(keyword_ids[0], "resolv_timeout"); CONST_ID(keyword_ids[1], "connect_timeout"); } rb_scan_args(argc, argv, "22:", &remote_host, &remote_serv, &local_host, &local_serv, &opt); if (!NIL_P(opt)) { rb_get_kwargs(opt, keyword_ids, 0, 2, kwargs); if (kwargs[0] != Qundef) { resolv_timeout = kwargs[0]; } if (kwargs[1] != Qundef) { connect_timeout = kwargs[1]; } } return rsock_init_inetsock(sock, remote_host, remote_serv, local_host, local_serv, INET_CLIENT, resolv_timeout, connect_timeout); }