Add some indirection so Mono.Posix is not loaded unless needed.

Fixes #30.

Author: Alex Rønne Petersen

src/CommandLine.cs

@@ -69,6 +69,14 @@ static CommandLine()
             }
         }
 
+        internal static void SetUnixSignalAction(Signum signal, SignalAction action)
+        {
+            // This seemingly pointless method adds some
+            // indirection so that we don't load `Mono.Posix`
+            // unless we absolutely need to.
+            Stdlib.SetSignalAction(signal, action);
+        }
+
         static void Process(string cmd, bool rc)
         {
             if (!rc && _lineEditor == null)
@@ -190,7 +198,7 @@ internal static void SetControlCHandler()
             }
             else if (_signalThread == null)
             {
-                Stdlib.SetSignalAction(Signum.SIGINT, SignalAction.Default);
+                SetUnixSignalAction(Signum.SIGINT, SignalAction.Default);
 
                 _signalThread = new Thread(() =>
                 {
@@ -230,7 +238,7 @@ internal static void UnsetControlCHandler()
 
                 _signalThread = null;
 
-                Stdlib.SetSignalAction(Signum.SIGINT, SignalAction.Ignore);
+                SetUnixSignalAction(Signum.SIGINT, SignalAction.Ignore);
             }
         }
 

src/Program.cs

@@ -100,7 +100,7 @@ static int Main(string[] args)
             // disposition to `SIG_IGN` so that the debuggee inherits
             // this and doesn't die.
             if (!Utilities.IsWindows && !batch)
-                Stdlib.SetSignalAction(Signum.SIGINT, SignalAction.Ignore);
+                CommandLine.SetUnixSignalAction(Signum.SIGINT, SignalAction.Ignore);
 
             CommandLine.Run(ver, batch, rc, cmds, files);