Clean up and restructure sources

src/ripple/basics/impl/Sustain.cpp

@@ -0,0 +1,130 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2012, 2013 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#include <ripple/basics/ThreadName.h>
+    
+// For Sustain Linux variants
+// VFALCO TODO Rewrite Sustain to use beast::Process
+#ifdef __linux__
+#include <sys/types.h>
+#include <sys/prctl.h>
+#include <sys/wait.h>
+#endif
+#ifdef __FreeBSD__
+#include <sys/types.h>
+#include <sys/wait.h>
+#endif
+
+namespace ripple {
+
+#ifdef __unix__
+
+static pid_t pManager = static_cast<pid_t> (0);
+static pid_t pChild = static_cast<pid_t> (0);
+
+static void pass_signal (int a)
+{
+    kill (pChild, a);
+}
+
+static void stop_manager (int)
+{
+    kill (pChild, SIGINT);
+    _exit (0);
+}
+
+bool HaveSustain ()
+{
+    return true;
+}
+
+std::string StopSustain ()
+{
+    if (getppid () != pManager)
+        return std::string ();
+
+    kill (pManager, SIGHUP);
+    return "Terminating monitor";
+}
+
+std::string DoSustain (std::string logFile)
+{
+    int childCount = 0;
+    pManager = getpid ();
+    signal (SIGINT, stop_manager);
+    signal (SIGHUP, stop_manager);
+    signal (SIGUSR1, pass_signal);
+    signal (SIGUSR2, pass_signal);
+
+    while (1)
+    {
+        ++childCount;
+        pChild = fork ();
+
+        if (pChild == -1)
+            _exit (0);
+
+        if (pChild == 0)
+        {
+            setCallingThreadName ("main");
+            signal (SIGINT, SIG_DFL);
+            signal (SIGHUP, SIG_DFL);
+            signal (SIGUSR1, SIG_DFL);
+            signal (SIGUSR2, SIG_DFL);
+            return str (boost::format ("Launching child %d") % childCount);;
+        }
+
+        setCallingThreadName (boost::str (boost::format ("#%d") % childCount).c_str ());
+
+        sleep (9);
+        do
+        {
+            int i;
+            sleep (1);
+            waitpid (pChild, &i, 0);
+        }
+        while (kill (pChild, 0) == 0);
+
+        rename ("core", boost::str (boost::format ("core.%d") % static_cast<int> (pChild)).c_str ());
+        if (!logFile.empty()) // FIXME: logFile hasn't been set yet
+            rename (logFile.c_str(),
+                    boost::str (boost::format ("%s.%d")
+                                % logFile
+                                % static_cast<int> (pChild)).c_str ());
+    }
+}
+
+#else
+
+bool HaveSustain ()
+{
+    return false;
+}
+std::string DoSustain (std::string)
+{
+    return std::string ();
+}
+std::string StopSustain ()
+{
+    return std::string ();
+}
+
+#endif
+
+} // ripple