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/*
Copyright (c) 2011-2012 250bpm s.r.o.
Copyright (c) 2011 Other contributors as noted in the AUTHORS file
This file is part of Crossroads I/O project.
Crossroads I/O is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Crossroads is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ipc_listener.hpp"
#if !defined XS_HAVE_WINDOWS && !defined XS_HAVE_OPENVMS
#include <new>
#include <string.h>
#include "stream_engine.hpp"
#include "ipc_address.hpp"
#include "io_thread.hpp"
#include "session_base.hpp"
#include "config.hpp"
#include "err.hpp"
#include "ip.hpp"
#include <unistd.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <sys/un.h>
xs::ipc_listener_t::ipc_listener_t (io_thread_t *io_thread_,
socket_base_t *socket_, const options_t &options_) :
own_t (io_thread_, options_),
io_object_t (io_thread_),
has_file (false),
s (retired_fd),
socket (socket_)
{
}
xs::ipc_listener_t::~ipc_listener_t ()
{
if (s != retired_fd)
close ();
}
void xs::ipc_listener_t::process_plug ()
{
// Start polling for incoming connections.
handle = add_fd (s);
set_pollin (handle);
}
void xs::ipc_listener_t::process_term (int linger_)
{
rm_fd (handle);
own_t::process_term (linger_);
}
void xs::ipc_listener_t::in_event (fd_t fd_)
{
fd_t fd = accept ();
// If connection was reset by the peer in the meantime, just ignore it.
// TODO: Handle specific errors like ENFILE/EMFILE etc.
if (fd == retired_fd)
return;
// Create the engine object for this connection.
stream_engine_t *engine = new (std::nothrow) stream_engine_t (fd, options);
alloc_assert (engine);
// Choose I/O thread to run connecter in. Given that we are already
// running in an I/O thread, there must be at least one available.
io_thread_t *thread = choose_io_thread (options.affinity);
xs_assert (thread);
// Create and launch a session object.
session_base_t *session = session_base_t::create (thread, false, socket,
options, NULL, NULL);
errno_assert (session);
session->inc_seqnum ();
launch_child (session);
send_attach (session, engine, false);
}
int xs::ipc_listener_t::set_address (const char *addr_)
{
// Get rid of the file associated with the UNIX domain socket that
// may have been left behind by the previous run of the application.
::unlink (addr_);
filename.clear ();
// Initialise the address structure.
ipc_address_t address;
int rc = address.resolve (addr_);
if (rc != 0)
return -1;
// Create a listening socket.
s = open_socket (AF_UNIX, SOCK_STREAM, 0);
if (s == -1)
return -1;
// Bind the socket to the file path.
rc = bind (s, address.addr (), address.addrlen ());
if (rc != 0)
return -1;
filename.assign(addr_);
has_file = true;
// Listen for incomming connections.
rc = listen (s, options.backlog);
if (rc != 0)
return -1;
return 0;
}
int xs::ipc_listener_t::close ()
{
xs_assert (s != retired_fd);
int rc = ::close (s);
if (rc != 0)
return -1;
s = retired_fd;
// If there's an underlying UNIX domain socket, get rid of the file it
// is associated with.
if (has_file && !filename.empty ()) {
rc = ::unlink(filename.c_str ());
if (rc != 0)
return -1;
}
return 0;
}
xs::fd_t xs::ipc_listener_t::accept ()
{
// Accept one connection and deal with different failure modes.
// The situation where connection cannot be accepted due to insufficient
// resources is considered valid and treated by ignoring the connection.
xs_assert (s != retired_fd);
fd_t sock = ::accept (s, NULL, NULL);
if (sock == -1) {
errno_assert (errno == EAGAIN || errno == EWOULDBLOCK ||
errno == EINTR || errno == ECONNABORTED || errno == EPROTO ||
errno == ENOBUFS || errno == ENOMEM || errno == EMFILE ||
errno == ENFILE);
return retired_fd;
}
return sock;
}
#endif
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