xs_shutdown implemented

This patch allows for partial shutdown of the socket.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>

23 files changed, 162 insertions, 51 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index ba76260..47a880b 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -24,7 +24,8 @@ noinst_PROGRAMS = pair_inproc \
                   wireformat \
                   libzmq21 \
                   resubscribe \
-                  survey
+                  survey \
+                  shutdown
 
 pair_inproc_SOURCES = pair_inproc.cpp testutil.hpp
 pair_tcp_SOURCES = pair_tcp.cpp testutil.hpp
@@ -48,5 +49,6 @@ wireformat_SOURCES = wireformat.cpp
 libzmq21_SOURCES = libzmq21.cpp
 resubscribe_SOURCES = resubscribe.cpp
 survey_SOURCES = survey.cpp
+shutdown_SOURCES = shutdown.cpp
 
 TESTS = $(noinst_PROGRAMS)
diff --git a/tests/hwm.cpp b/tests/hwm.cpp
index 6cd9a41..93e8910 100644
--- a/tests/hwm.cpp
+++ b/tests/hwm.cpp
@@ -35,14 +35,14 @@ int XS_TEST_MAIN ()
     int rc = xs_setsockopt (sb, XS_RCVHWM, &hwm, sizeof (hwm));
     assert (rc == 0);
     rc = xs_bind (sb, "inproc://a");
-    assert (rc == 0);
+    assert (rc != -1);
 
     void *sc = xs_socket (ctx, XS_PUSH);
     assert (sc);
     rc = xs_setsockopt (sc, XS_SNDHWM, &hwm, sizeof (hwm));
     assert (rc == 0);
     rc = xs_connect (sc, "inproc://a");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  Try to send 10 messages. Only 4 should succeed.
     for (int i = 0; i < 10; i++)
diff --git a/tests/invalid_rep.cpp b/tests/invalid_rep.cpp
index cd0ad8e..93118b6 100644
--- a/tests/invalid_rep.cpp
+++ b/tests/invalid_rep.cpp
@@ -38,9 +38,9 @@ int XS_TEST_MAIN ()
     rc = xs_setsockopt (req_socket, XS_LINGER, &linger, sizeof (int));
     assert (rc == 0);
     rc = xs_bind (xrep_socket, "inproc://hi");
-    assert (rc == 0);
+    assert (rc != -1);
     rc = xs_connect (req_socket, "inproc://hi");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  Initial request.
     rc = xs_send (req_socket, "r", 1, 0);
diff --git a/tests/libzmq21.cpp b/tests/libzmq21.cpp
index e7affae..ecf271b 100644
--- a/tests/libzmq21.cpp
+++ b/tests/libzmq21.cpp
@@ -57,7 +57,7 @@ int XS_TEST_MAIN ()
     int rc = xs_setsockopt (pub, XS_PROTOCOL, &protocol, sizeof (protocol));
     assert (rc == 0);
     rc = xs_bind (pub, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
 
     int oldsub = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
     struct sockaddr_in address;
@@ -105,7 +105,7 @@ int XS_TEST_MAIN ()
     rc = xs_setsockopt (sub, XS_SUBSCRIBE, "", 0);
     assert (rc == 0);
     rc = xs_bind (sub, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
 
     int oldpub = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
     address.sin_family = AF_INET;
diff --git a/tests/linger.cpp b/tests/linger.cpp
index fec0f72..1b1d341 100644
--- a/tests/linger.cpp
+++ b/tests/linger.cpp
@@ -37,7 +37,7 @@ int XS_TEST_MAIN ()
     //  Connect to non-existent endpoing.
     assert (rc == 0);
     rc = xs_connect (s, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  Send a message.
     rc = xs_send (s, "r", 1, 0);
diff --git a/tests/msg_flags.cpp b/tests/msg_flags.cpp
index eade40f..3f3b3b1 100644
--- a/tests/msg_flags.cpp
+++ b/tests/msg_flags.cpp
@@ -30,11 +30,11 @@ int XS_TEST_MAIN ()
     void *sb = xs_socket (ctx, XS_XREP);
     assert (sb);
     int rc = xs_bind (sb, "inproc://a");
-    assert (rc == 0);
+    assert (rc != -1);
     void *sc = xs_socket (ctx, XS_XREQ);
     assert (sc);
     rc = xs_connect (sc, "inproc://a");
-    assert (rc == 0);
+    assert (rc != -1);
    
     //  Send 2-part message.
     rc = xs_send (sc, "A", 1, XS_SNDMORE);
diff --git a/tests/pair_inproc.cpp b/tests/pair_inproc.cpp
index c02d08b..456a371 100644
--- a/tests/pair_inproc.cpp
+++ b/tests/pair_inproc.cpp
@@ -30,12 +30,12 @@ int XS_TEST_MAIN ()
     void *sb = xs_socket (ctx, XS_PAIR);
     assert (sb);
     int rc = xs_bind (sb, "inproc://a");
-    assert (rc == 0);
+    assert (rc != -1);
 
     void *sc = xs_socket (ctx, XS_PAIR);
     assert (sc);
     rc = xs_connect (sc, "inproc://a");
-    assert (rc == 0);
+    assert (rc != -1);
     
     bounce (sb, sc);
 
diff --git a/tests/pair_ipc.cpp b/tests/pair_ipc.cpp
index 43915cc..ef39bfc 100644
--- a/tests/pair_ipc.cpp
+++ b/tests/pair_ipc.cpp
@@ -37,12 +37,12 @@ int XS_TEST_MAIN ()
     void *sb = xs_socket (ctx, XS_PAIR);
     assert (sb);
     int rc = xs_bind (sb, "ipc:///tmp/tester");
-    assert (rc == 0);
+    assert (rc != -1);
 
     void *sc = xs_socket (ctx, XS_PAIR);
     assert (sc);
     rc = xs_connect (sc, "ipc:///tmp/tester");
-    assert (rc == 0);
+    assert (rc != -1);
     
     bounce (sb, sc);
 
diff --git a/tests/pair_tcp.cpp b/tests/pair_tcp.cpp
index a0decb9..1df90ad 100644
--- a/tests/pair_tcp.cpp
+++ b/tests/pair_tcp.cpp
@@ -31,12 +31,12 @@ int XS_TEST_MAIN ()
     void *sb = xs_socket (ctx, XS_PAIR);
     assert (sb);
     int rc = xs_bind (sb, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
 
     void *sc = xs_socket (ctx, XS_PAIR);
     assert (sc);
     rc = xs_connect (sc, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
     
     bounce (sb, sc);
 
diff --git a/tests/polltimeo.cpp b/tests/polltimeo.cpp
index ca88393..f425593 100644
--- a/tests/polltimeo.cpp
+++ b/tests/polltimeo.cpp
@@ -30,7 +30,7 @@ extern "C"
         void *sc = xs_socket (ctx_, XS_PUSH);
         assert (sc);
         int rc = xs_connect (sc, "inproc://timeout_test");
-        assert (rc == 0);
+        assert (rc != -1);
         sleep (1);
         rc = xs_close (sc);
         assert (rc == 0);
@@ -48,7 +48,7 @@ int XS_TEST_MAIN ()
     void *sb = xs_socket (ctx, XS_PULL);
     assert (sb);
     int rc = xs_bind (sb, "inproc://timeout_test");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  Check whether timeout is honoured.
     xs_pollitem_t pi;
diff --git a/tests/reconnect.cpp b/tests/reconnect.cpp
index c677527..ebbaf32 100644
--- a/tests/reconnect.cpp
+++ b/tests/reconnect.cpp
@@ -34,7 +34,7 @@ int XS_TEST_MAIN ()
 
     //  Connect before bind was done at the peer and send one message.
     int rc = xs_connect (push, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
     rc = xs_send (push, "ABC", 3, 0);
     assert (rc == 3);
 
@@ -43,7 +43,7 @@ int XS_TEST_MAIN ()
 
     //  Bind the peer and get the message.
     rc = xs_bind (pull, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
     unsigned char buf [3];
     rc = xs_recv (pull, buf, sizeof (buf), 0);
     assert (rc == 3);
@@ -64,7 +64,7 @@ int XS_TEST_MAIN ()
 
     //  Connect before bind was done at the peer and send one message.
     rc = xs_connect (push, "ipc:///tmp/tester");
-    assert (rc == 0);
+    assert (rc != -1);
     rc = xs_send (push, "ABC", 3, 0);
     assert (rc == 3);
 
@@ -73,7 +73,7 @@ int XS_TEST_MAIN ()
 
     //  Bind the peer and get the message.
     rc = xs_bind (pull, "ipc:///tmp/tester");
-    assert (rc == 0);
+    assert (rc != -1);
     rc = xs_recv (pull, buf, sizeof (buf), 0);
     assert (rc == 3);
 
diff --git a/tests/reqrep_device.cpp b/tests/reqrep_device.cpp
index 81960d9..732f4dc 100644
--- a/tests/reqrep_device.cpp
+++ b/tests/reqrep_device.cpp
@@ -32,23 +32,23 @@ int XS_TEST_MAIN ()
     void *xreq = xs_socket (ctx, XS_XREQ);
     assert (xreq);
     int rc = xs_bind (xreq, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
     void *xrep = xs_socket (ctx, XS_XREP);
     assert (xrep);
     rc = xs_bind (xrep, "tcp://127.0.0.1:5561");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  Create a worker.
     void *rep = xs_socket (ctx, XS_REP);
     assert (rep);
     rc = xs_connect (rep, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  Create a client.
     void *req = xs_socket (ctx, XS_REQ);
     assert (req);
     rc = xs_connect (req, "tcp://127.0.0.1:5561");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  Send a request.
     rc = xs_send (req, "ABC", 3, XS_SNDMORE);
diff --git a/tests/reqrep_inproc.cpp b/tests/reqrep_inproc.cpp
index c66b82b..bd5cc92 100644
--- a/tests/reqrep_inproc.cpp
+++ b/tests/reqrep_inproc.cpp
@@ -30,12 +30,12 @@ int XS_TEST_MAIN ()
     void *sb = xs_socket (ctx, XS_REP);
     assert (sb);
     int rc = xs_bind (sb, "inproc://a");
-    assert (rc == 0);
+    assert (rc != -1);
 
     void *sc = xs_socket (ctx, XS_REQ);
     assert (sc);
     rc = xs_connect (sc, "inproc://a");
-    assert (rc == 0);
+    assert (rc != -1);
     
     bounce (sb, sc);
 
diff --git a/tests/reqrep_ipc.cpp b/tests/reqrep_ipc.cpp
index 9be50fb..66315ef 100644
--- a/tests/reqrep_ipc.cpp
+++ b/tests/reqrep_ipc.cpp
@@ -37,12 +37,12 @@ int XS_TEST_MAIN ()
     void *sb = xs_socket (ctx, XS_REP);
     assert (sb);
     int rc = xs_bind (sb, "ipc:///tmp/tester");
-    assert (rc == 0);
+    assert (rc != -1);
 
     void *sc = xs_socket (ctx, XS_REQ);
     assert (sc);
     rc = xs_connect (sc, "ipc:///tmp/tester");
-    assert (rc == 0);
+    assert (rc != -1);
     
     bounce (sb, sc);
 
diff --git a/tests/reqrep_tcp.cpp b/tests/reqrep_tcp.cpp
index b11d5a1..f68d762 100644
--- a/tests/reqrep_tcp.cpp
+++ b/tests/reqrep_tcp.cpp
@@ -31,12 +31,12 @@ int XS_TEST_MAIN ()
     void *sb = xs_socket (ctx, XS_REP);
     assert (sb);
     int rc = xs_bind (sb, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
 
     void *sc = xs_socket (ctx, XS_REQ);
     assert (sc);
     rc = xs_connect (sc, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
     
     bounce (sb, sc);
 
diff --git a/tests/resubscribe.cpp b/tests/resubscribe.cpp
index 1924434..5d78712 100644
--- a/tests/resubscribe.cpp
+++ b/tests/resubscribe.cpp
@@ -34,13 +34,13 @@ int XS_TEST_MAIN ()
 
     //  Send two subscriptions upstream.
     int rc = xs_bind (xpub, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
     rc = xs_setsockopt (sub, XS_SUBSCRIBE, "a", 1);
     assert (rc == 0);
     rc = xs_setsockopt (sub, XS_SUBSCRIBE, "b", 1);
     assert (rc == 0);
     rc = xs_connect (sub, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  Check whether subscriptions are correctly received.
     char buf [5];
@@ -68,7 +68,7 @@ int XS_TEST_MAIN ()
     xpub = xs_socket (ctx, XS_XPUB);
     assert (xpub);
     rc = xs_bind (xpub, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  We have to give control to the SUB socket here so that it has
     //  chance to resend the subscriptions.
diff --git a/tests/shutdown.cpp b/tests/shutdown.cpp
new file mode 100644
index 0000000..9f055a1
--- /dev/null
+++ b/tests/shutdown.cpp
@@ -0,0 +1,103 @@
+/*
+    Copyright (c) 2012 250bpm s.r.o.
+    Copyright (c) 2012 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 "testutil.hpp"
+
+int XS_TEST_MAIN ()
+{
+    int rc;
+    char buf [32];
+
+    fprintf (stderr, "shutdown test running...\n");
+
+    //  Create infrastructure.
+    void *ctx = xs_init ();
+    assert (ctx);
+    void *push = xs_socket (ctx, XS_PUSH);
+    assert (push);
+    int push_id = xs_bind (push, "tcp://127.0.0.1:5560");
+    assert (push_id != -1);
+    void *pull = xs_socket (ctx, XS_PULL);
+    assert (pull);
+    rc = xs_connect (pull, "tcp://127.0.0.1:5560");
+    assert (rc != -1);
+
+    //  Pass one message through to ensure the connection is established.
+    rc = xs_send (push, "ABC", 3, 0);
+    assert (rc == 3);
+    rc = xs_recv (pull, buf, sizeof (buf), 0);
+    assert (rc == 3);
+
+    //  Shut down the bound endpoint.
+    rc = xs_shutdown (push, push_id);
+    assert (rc == 0); 
+    sleep (1);
+
+    //  Check that sending would block (there's no outbound connection).
+    rc = xs_send (push, "ABC", 3, XS_DONTWAIT);
+    assert (rc == -1 && xs_errno () == EAGAIN);
+
+    //  Clean up.
+    rc = xs_close (pull);
+    assert (rc == 0);
+    rc = xs_close (push);
+    assert (rc == 0);
+    rc = xs_term (ctx);
+    assert (rc == 0);
+
+    //  Now the other way round.
+
+    //  Create infrastructure.
+    ctx = xs_init ();
+    assert (ctx);
+    pull = xs_socket (ctx, XS_PULL);
+    assert (pull);
+    rc = xs_bind (pull, "tcp://127.0.0.1:5560");
+    assert (rc != -1);
+    push = xs_socket (ctx, XS_PUSH);
+    assert (push);
+    push_id = xs_connect (push, "tcp://127.0.0.1:5560");
+    assert (push_id != -1);
+
+    //  Pass one message through to ensure the connection is established.
+    rc = xs_send (push, "ABC", 3, 0);
+    assert (rc == 3);
+    rc = xs_recv (pull, buf, sizeof (buf), 0);
+    assert (rc == 3);
+
+    //  Shut down the bound endpoint.
+    rc = xs_shutdown (push, push_id);
+    assert (rc == 0); 
+    sleep (1);
+
+    //  Check that sending would block (there's no outbound connection).
+    rc = xs_send (push, "ABC", 3, XS_DONTWAIT);
+    assert (rc == -1 && xs_errno () == EAGAIN);
+
+    //  Clean up.
+    rc = xs_close (pull);
+    assert (rc == 0);
+    rc = xs_close (push);
+    assert (rc == 0);
+    rc = xs_term (ctx);
+    assert (rc == 0);
+
+    return 0;
+}
diff --git a/tests/shutdown_stress.cpp b/tests/shutdown_stress.cpp
index f106cc0..2b598a9 100644
--- a/tests/shutdown_stress.cpp
+++ b/tests/shutdown_stress.cpp
@@ -30,7 +30,7 @@ extern "C"
         int rc;
 
         rc = xs_connect (s_, "tcp://127.0.0.1:5560");
-        assert (rc == 0);
+        assert (rc != -1);
 
         //  Start closing the socket while the connecting process is underway.
         rc = xs_close (s_);
@@ -65,7 +65,7 @@ int XS_TEST_MAIN ()
         assert (s1);
 
         rc = xs_bind (s1, "tcp://127.0.0.1:5560");
-        assert (rc == 0);
+        assert (rc != -1);
 
         for (i = 0; i != THREAD_COUNT; i++) {
             s2 = xs_socket (ctx, XS_SUB);
diff --git a/tests/sub_forward.cpp b/tests/sub_forward.cpp
index 6d385de..0237352 100644
--- a/tests/sub_forward.cpp
+++ b/tests/sub_forward.cpp
@@ -32,23 +32,23 @@ int XS_TEST_MAIN ()
     void *xpub = xs_socket (ctx, XS_XPUB);
     assert (xpub);
     int rc = xs_bind (xpub, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
     void *xsub = xs_socket (ctx, XS_XSUB);
     assert (xsub);
     rc = xs_bind (xsub, "tcp://127.0.0.1:5561");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  Create a publisher.
     void *pub = xs_socket (ctx, XS_PUB);
     assert (pub);
     rc = xs_connect (pub, "tcp://127.0.0.1:5561");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  Create a subscriber.
     void *sub = xs_socket (ctx, XS_SUB);
     assert (sub);
     rc = xs_connect (sub, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  Subscribe for all messages.
     rc = xs_setsockopt (sub, XS_SUBSCRIBE, "", 0);
diff --git a/tests/survey.cpp b/tests/survey.cpp
index 9347e2d..f21b217 100644
--- a/tests/survey.cpp
+++ b/tests/survey.cpp
@@ -33,23 +33,23 @@ int XS_TEST_MAIN ()
     void *xsurveyor = xs_socket (ctx, XS_XSURVEYOR);
     assert (xsurveyor);
     rc = xs_bind (xsurveyor, "inproc://a");
-    assert (rc == 0);
+    assert (rc != -1);
     void *xrespondent = xs_socket (ctx, XS_XRESPONDENT);
     assert (xrespondent);
     rc = xs_bind (xrespondent, "inproc://b");
-    assert (rc == 0);
+    assert (rc != -1);
     void *surveyor = xs_socket (ctx, XS_SURVEYOR);
     assert (surveyor);
     rc = xs_connect (surveyor, "inproc://b");
-    assert (rc == 0);
+    assert (rc != -1);
     void *respondent1 = xs_socket (ctx, XS_RESPONDENT);
     assert (respondent1);
     rc = xs_connect (respondent1, "inproc://a");
-    assert (rc == 0);
+    assert (rc != -1);
     void *respondent2 = xs_socket (ctx, XS_RESPONDENT);
     assert (respondent2);
     rc = xs_connect (respondent2, "inproc://a");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  Send the survey.
     rc = xs_send (surveyor, "ABC", 3, 0);
diff --git a/tests/tests.cpp b/tests/tests.cpp
index 3d7951c..da034e6 100644
--- a/tests/tests.cpp
+++ b/tests/tests.cpp
@@ -115,6 +115,10 @@
 #include "survey.cpp"
 #undef XS_TEST_MAIN
 
+#define XS_TEST_MAIN shutdown
+#include "shutdown.cpp"
+#undef XS_TEST_MAIN
+
 int main ()
 {
     int rc;
@@ -161,6 +165,8 @@ int main ()
     assert (rc == 0);
     rc = survey ();
     assert (rc == 0);
+    rc = shutdown ()
+    assert (rc == 0);
     fprintf (stderr, "SUCCESS\n");
     sleep (1);
 
diff --git a/tests/timeo.cpp b/tests/timeo.cpp
index bc73eec..fb17c85 100644
--- a/tests/timeo.cpp
+++ b/tests/timeo.cpp
@@ -30,7 +30,7 @@ extern "C"
         void *sc = xs_socket (ctx_, XS_PUSH);
         assert (sc);
         int rc = xs_connect (sc, "inproc://timeout_test");
-        assert (rc == 0);
+        assert (rc != -1);
         sleep (1);
         rc = xs_close (sc);
         assert (rc == 0);
@@ -48,7 +48,7 @@ int XS_TEST_MAIN ()
     void *sb = xs_socket (ctx, XS_PULL);
     assert (sb);
     int rc = xs_bind (sb, "inproc://timeout_test");
-    assert (rc == 0);
+    assert (rc != -1);
 
     //  Check whether non-blocking recv returns immediately.
     char buf [] = "12345678ABCDEFGH12345678abcdefgh";
@@ -90,7 +90,7 @@ int XS_TEST_MAIN ()
     rc = xs_setsockopt(sb, XS_SNDTIMEO, &timeout, timeout_size);
     assert (rc == 0);
     rc = xs_connect (sc, "inproc://timeout_test");
-    assert (rc == 0);
+    assert (rc != -1);
     rc = xs_send (sc, buf, 32, 0);
     assert (rc == 32);
     rc = xs_recv (sb, buf, 32, 0);
diff --git a/tests/wireformat.cpp b/tests/wireformat.cpp
index 1177798..f3e0f96 100644
--- a/tests/wireformat.cpp
+++ b/tests/wireformat.cpp
@@ -50,9 +50,9 @@ int XS_TEST_MAIN ()
 
     //  Bind the peer and get the message.
     int rc = xs_bind (pull, "tcp://127.0.0.1:5560");
-    assert (rc == 0);
+    assert (rc != -1);
     rc = xs_bind (push, "tcp://127.0.0.1:5561");
-    assert (rc == 0);
+    assert (rc != -1);
 
     // Connect to the peer using raw sockets.
     int rpush = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);