grapher: implement restarting a stap process

* grapher/StapParser.cxx (StapParser::disconnect): new function
* grapher/StapParser.hxx (StapProcess::StapProcess): initialize argv to 0
* grapher/grapher.cxx (StapLauncher::setArgs): Set argv to 0
  (StapLauncher launch, launchUsingParser): Refactor launch(),
  extracting function a that (re)launches a stap process using an
  existing parser.
  (StapLauncher::onChildDied): call disconnect() on dead parser.
  (GrapherWindow::_graphicalLauncher, setGraphicalLauncher): delete
  member, replacing with...
  (graphicalLauncher): new variable
  (ProcModelColumns): Store parser object in the list model instead of
  just a StapProcess object.
  (ProcWindow::onRestart): new function
  (ProcWindow::refresh): Preserve the list selection when the process
  list is refreshed.
  (ProcWindow::onSelectionChanged): Manage the restart button's state.

1 files changed, 2 insertions, 1 deletions

diff --git a/grapher/StapParser.hxx b/grapher/StapParser.hxx
index 24e84fc9..169533b6 100644
--- a/grapher/StapParser.hxx
+++ b/grapher/StapParser.hxx
@@ -18,7 +18,7 @@ namespace systemtap
   // arguments and script for a stap process
   struct StapProcess
   {
-    StapProcess(pid_t pid_ = -1) : pid(pid_) {}
+    StapProcess(pid_t pid_ = -1) : argv(0), pid(pid_) {}
     std::string stapArgs;
     std::string script;
     std::string scriptArgs;
@@ -67,6 +67,7 @@ namespace systemtap
       _process = process;
     }
     void initIo(int inFd, int errFd, bool catchHUP);
+    void disconnect();
   };
 
   sigc::signal<void, pid_t>& childDiedSignal();