Coro::Socket(3) non-blocking socket-I/O


use Coro::Socket;
# listen on an ipv4 socket
my $socket = new Coro::Socket PeerHost => "localhost",
PeerPort => 'finger';
# listen on any other type of socket
my $socket = Coro::Socket->new_from_fh
Local => "/tmp/socket",


This module is an AnyEvent user, you need to make sure that you use and run a supported event loop.

This module implements socket-handles in a coroutine-compatible way, that is, other coroutines can run while reads or writes block on the handle. See Coro::Handle, especially the note about prefering method calls.


This module was written to imitate the IO::Socket::INET API, and derive from it. Since IO::Socket::INET does not support IPv6, this module does neither.

Therefore it is not recommended to use Coro::Socket in new code. Instead, use AnyEvent::Socket and Coro::Handle, e.g.:

   use Coro;
   use Coro::Handle;
   use AnyEvent::Socket;
   # use tcp_connect from AnyEvent::Socket
   # and call Coro::Handle::unblock on it.
   tcp_connect "", 80, Coro::rouse_cb;
   my $fh = unblock +(Coro::rouse_wait)[0];
   # now we have a perfectly thread-safe socket handle in $fh
   print $fh "GET / HTTP/1.0\015\012\015\012";
   local $/;
   print <$fh>;

Using "AnyEvent::Socket::tcp_connect" gives you transparent IPv6, multi-homing, SRV-record etc. support.

For listening sockets, use "AnyEvent::Socket::tcp_server".

$fh = new Coro::Socket param => value, ...
Create a new non-blocking tcp handle and connect to the given host and port. The parameter names and values are mostly the same as for IO::Socket::INET (as ugly as I think they are).

The parameters officially supported currently are: "ReuseAddr", "LocalPort", "LocalHost", "PeerPort", "PeerHost", "Listen", "Timeout", "SO_RCVBUF", "SO_SNDBUF".

   $fh = new Coro::Socket PeerHost => "localhost", PeerPort => 'finger';


   Marc A. Lehmann <[email protected]>