Initial ZMQ bindings.

vendor/ZMQ/builds/zos/test_fork.cpp

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+/*
+    Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
+
+    This file is part of libzmq, the ZeroMQ core engine in C++.
+
+    libzmq is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License (LGPL) as published
+    by the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    As a special exception, the Contributors give you permission to link
+    this library with independent modules to produce an executable,
+    regardless of the license terms of these independent modules, and to
+    copy and distribute the resulting executable under terms of your choice,
+    provided that you also meet, for each linked independent module, the
+    terms and conditions of the license of that module. An independent
+    module is a module which is not derived from or based on this library.
+    If you modify this library, you must extend this exception to your
+    version of the library.
+
+    libzmq 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"
+#include <unistd.h>           // For alarm()
+
+const char *address = "tcp://127.0.0.1:6571";
+
+#define NUM_MESSAGES 5
+#define TIMEOUT_SECS 5        // Global timeout
+
+int main (void)
+{
+    setup_test_environment ();
+    void *ctx = zmq_ctx_new ();
+    assert (ctx);
+
+    //  Create and bind pull socket to receive messages
+    void *pull = zmq_socket (ctx, ZMQ_PULL);
+    assert (pull);
+    int rc = zmq_bind (pull, address);
+    assert (rc == 0);
+
+    int pid = fork ();
+    if (pid == 0) {
+        //  Child process
+        //  Immediately close parent sockets and context
+        zmq_close (pull);
+        zmq_ctx_term (ctx);
+
+        //  Create new context, socket, connect and send some messages
+        void *child_ctx = zmq_ctx_new ();
+        assert (child_ctx);
+        void *push = zmq_socket (child_ctx, ZMQ_PUSH);
+        assert (push);
+        rc = zmq_connect (push, address);
+        assert (rc == 0);
+        int count;
+        for (count = 0; count < NUM_MESSAGES; count++)
+            zmq_send (push, "Hello", 5, 0);
+
+        zmq_close (push);
+        zmq_ctx_destroy (child_ctx);
+        exit (0);
+    }
+    else {
+        //  Parent process
+        alarm(TIMEOUT_SECS);   // Set upper limit on runtime
+
+        int count;
+        for (count = 0; count < NUM_MESSAGES; count++) {
+            char buffer [5];
+            int num_bytes = zmq_recv (pull, buffer, 5, 0);
+            assert (num_bytes == 5);
+        }
+        int child_status;
+        while (true) {
+            rc = waitpid (pid, &child_status, 0);
+            if (rc == -1 && errno == EINTR)
+                continue;
+            assert (rc > 0);
+            //  Verify the status code of the child was zero
+            assert (WEXITSTATUS (child_status) == 0);
+            break;
+        }
+        exit (0);
+    }
+    return 0;
+}