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
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) { 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.
static VALUE tcp_init(int argc, VALUE *argv, VALUE sock) { VALUE remote_host, remote_serv; VALUE local_host, local_serv; rb_scan_args(argc, argv, "22", &remote_host, &remote_serv, &local_host, &local_serv); return rsock_init_inetsock(sock, remote_host, remote_serv, local_host, local_serv, INET_CLIENT); }