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.\" ========================================================================
.\"
.IX Title "Socket 3pm"
.TH Socket 3pm "2018-12-17" "perl v5.28.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Coro::Socket \- non\-blocking socket\-I/O
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& use Coro::Socket;
\&
\& # listen on an ipv4 socket
\& my $socket = new Coro::Socket PeerHost => "localhost",
\&                               PeerPort => \*(Aqfinger\*(Aq;
\&
\& # listen on any other type of socket
\& my $socket = Coro::Socket\->new_from_fh
\&                 (IO::Socket::UNIX\->new
\&                     Local  => "/tmp/socket",
\&                     Type   => SOCK_STREAM,
\&                 );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module is an AnyEvent user, you need to make sure that you use and
run a supported event loop.
.PP
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.
.SH "IPV6 WARNING"
.IX Header "IPV6 WARNING"
This module was written to imitate the IO::Socket::INET \s-1API,\s0 and derive
from it. Since IO::Socket::INET does not support IPv6, this module does
neither.
.PP
Therefore it is not recommended to use Coro::Socket in new code. Instead,
use AnyEvent::Socket and Coro::Handle, e.g.:
.PP
.Vb 3
\&   use Coro;
\&   use Coro::Handle;
\&   use AnyEvent::Socket;
\&
\&   # use tcp_connect from AnyEvent::Socket
\&   # and call Coro::Handle::unblock on it.
\&
\&   tcp_connect "www.google.com", 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\e015\e012\e015\e012";
\&   local $/;
\&   print <$fh>;
.Ve
.PP
Using \f(CW\*(C`AnyEvent::Socket::tcp_connect\*(C'\fR gives you transparent IPv6,
multi-homing, SRV-record etc. support.
.PP
For listening sockets, use \f(CW\*(C`AnyEvent::Socket::tcp_server\*(C'\fR.
.ie n .IP "$fh = new Coro::Socket param => value, ..." 4
.el .IP "\f(CW$fh\fR = new Coro::Socket param => value, ..." 4
.IX Item "$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).
.Sp
The parameters officially supported currently are: \f(CW\*(C`ReuseAddr\*(C'\fR,
\&\f(CW\*(C`LocalPort\*(C'\fR, \f(CW\*(C`LocalHost\*(C'\fR, \f(CW\*(C`PeerPort\*(C'\fR, \f(CW\*(C`PeerHost\*(C'\fR, \f(CW\*(C`Listen\*(C'\fR, \f(CW\*(C`Timeout\*(C'\fR,
\&\f(CW\*(C`SO_RCVBUF\*(C'\fR, \f(CW\*(C`SO_SNDBUF\*(C'\fR.
.Sp
.Vb 1
\&   $fh = new Coro::Socket PeerHost => "localhost", PeerPort => \*(Aqfinger\*(Aq;
.Ve
.SH "AUTHOR/SUPPORT/CONTACT"
.IX Header "AUTHOR/SUPPORT/CONTACT"
.Vb 2
\&   Marc A. Lehmann <schmorp@schmorp.de>
\&   http://software.schmorp.de/pkg/Coro.html
.Ve