initial commit

src/tcp_connecter.cpp

@@ -0,0 +1,138 @@
+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "tcp_connecter.hpp"
+#include "platform.hpp"
+#include "ip.hpp"
+#include "err.hpp"
+
+#ifdef ZS_HAVE_WINDOWS
+
+#include "windows.hpp"
+#error
+
+#else
+
+#include <unistd.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/tcp.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <fcntl.h>
+
+zs::tcp_connecter_t::tcp_connecter_t () :
+    s (retired_fd)
+{
+}
+
+zs::tcp_connecter_t::~tcp_connecter_t ()
+{
+    if (s != retired_fd)
+        close ();
+}
+
+int zs::tcp_connecter_t::open (const char *addr_)
+{
+    zs_assert (s == retired_fd);
+
+    //  Convert the hostname into sockaddr_in structure.
+    sockaddr_in address;
+    int rc = resolve_ip_hostname (&address, addr_);
+    if (rc != 0)
+        return -1;
+
+    //  Create the socket.
+    s = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
+    if (s == -1)
+        return -1;
+
+    // Set to non-blocking mode.
+    int flags = fcntl (s, F_GETFL, 0);
+    if (flags == -1) 
+        flags = 0;
+    rc = fcntl (s, F_SETFL, flags | O_NONBLOCK);
+    errno_assert (rc != -1);
+
+    //  Disable Nagle's algorithm.
+    int flag = 1;
+    rc = setsockopt (s, IPPROTO_TCP, TCP_NODELAY, (char*) &flag, sizeof (int));
+    errno_assert (rc == 0);
+
+#ifdef ZS_HAVE_OPENVMS
+    //  Disable delayed acknowledgements.
+    flag = 1;
+    rc = setsockopt (s, IPPROTO_TCP, TCP_NODELACK, (char*) &flag, sizeof (int));
+    errno_assert (rc != SOCKET_ERROR);
+#endif
+
+    //  Connect to the remote peer.
+    rc = ::connect (s, (sockaddr*) &address, sizeof address);
+
+    //  Connect was successfull immediately.
+    if (rc == 0)
+        return 0;
+
+    //  Asynchronous connect was launched.
+    if (rc == -1 && errno == EINPROGRESS)
+        return 1;
+
+    //  Error occured.
+    int err = errno;
+    close ();
+    errno = err;
+    return -1;
+}
+
+int zs::tcp_connecter_t::close ()
+{
+    zs_assert (s != retired_fd);
+    int rc = ::close (s);
+    if (rc != 0)
+        return -1;
+    s = retired_fd;
+    return 0;
+}
+
+zs::fd_t zs::tcp_connecter_t::get_fd ()
+{
+    return s;
+}
+
+zs::fd_t zs::tcp_connecter_t::connect ()
+{
+    //  Following code should handle both Berkeley-derived socket
+    //  implementations and Solaris.
+    int err = 0;
+    socklen_t len = sizeof err;
+    int rc = getsockopt (s, SOL_SOCKET, SO_ERROR, (char*) &err, &len);
+    if (rc == -1)
+        err = errno;
+    if (err != 0) {
+        close ();
+        errno = err;
+        return retired_fd;
+    }
+
+    fd_t result = s;
+    s = retired_fd;
+    return result;
+}
+
+#endif