[mythtv] [PATCH] MythTV LIRC KeyPress Spawn External App

[Dan Morphis]

This patch allows mythtv to spawn an external app when lirc receives a 
key.  Why would you want this?  Well, some people on the lists have 
expressed interest in knowing when the system has received their button 
presses.  One could use it to toggle a parallel port driven LED.  Or as 
I do with Enrique Vidal's improved transmitter circuit (which has a led 
in it); send a lirc command which causes no action on the cable box, but 
causes lirc to pulse dtr thereby lighting up my ir and regular led.

The patch of course defaults to doing nothing  if the user hasn't 
specified/doesn't want said action to happen.  I've attached the sample 
script I use to cause the LED in my transmitter circuit to function.  
Alternatly, people could build the circuit described in "Re: 
[mythtv-users] LED Recording feature" and pulse the parallel port.

Enjoy!

-dan
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Index: libs/libmyth/lirc.cpp
===================================================================
RCS file: /var/lib/mythcvs/mythtv/libs/libmyth/lirc.cpp,v
retrieving revision 1.6
diff -u -d -r1.6 lirc.cpp
--- libs/libmyth/lirc.cpp	25 Jan 2004 08:27:42 -0000	1.6
+++ libs/libmyth/lirc.cpp	20 Mar 2004 02:41:41 -0000
@@ -3,6 +3,9 @@
 #include <qkeysequence.h>
 #include <cstdio>
 #include <cerrno>
+#include "mythcontext.h"
+
+#include <sys/wait.h>
 
 #include <iostream>
 using namespace std;
@@ -83,6 +86,39 @@
                 QApplication::postEvent(mainWindow, new LircKeycodeEvent(code, 
                                         keycode, false));
             }
+
+            //Spawn app to thwap led (or what ever the user has picked if
+            // anything) to give positive feedback that a key was received
+            QString external_app = gContext->GetSetting("LircKeyPressedApp") + " &";
+            if(external_app != " &")
+            {
+              pid_t child = fork();
+              if (child < 0)
+              {
+                  perror("fork");
+              }
+              else if (child == 0)
+              {
+                  for(int i = 3; i < sysconf(_SC_OPEN_MAX) - 1; ++i)
+                      close(i);
+                  execl("/bin/sh", "sh", "-c", external_app.ascii(), NULL);
+                  perror("exec");
+                  _exit(1);
+              }
+              else
+              {
+                  int status;
+                  if (waitpid(child, &status, 0) < 0)
+                  {
+                      perror("waitpid");
+                  }
+                  else if (status != 0)
+                  {
+                      cerr << "External key pressed command exited with status "
+                           << status << endl;
+                  }
+              }
+            }
         }
 
         free(ir);
Index: programs/mythfrontend/globalsettings.cpp
===================================================================
RCS file: /var/lib/mythcvs/mythtv/programs/mythfrontend/globalsettings.cpp,v
retrieving revision 1.147
diff -u -d -r1.147 globalsettings.cpp
--- programs/mythfrontend/globalsettings.cpp	14 Mar 2004 07:35:33 -0000	1.147
+++ programs/mythfrontend/globalsettings.cpp	20 Mar 2004 02:41:44 -0000
@@ -958,6 +958,17 @@
     };
 };
 
+class LircKeyPressedApp: public LineEditSetting, public GlobalSetting {
+public:
+    LircKeyPressedApp():
+        GlobalSetting("LircKeyPressedApp") {
+        setLabel(QObject::tr("Keypress Application"));
+        setValue("");
+        setHelpText(QObject::tr("External application or script to run when "
+                    "a keypress is received by lirc"));
+    };
+};
+
 class SetupPinCode: public LineEditSetting, public GlobalSetting {
 public:
     SetupPinCode():
@@ -1937,6 +1948,7 @@
     general->addChild(new AllowQuitShutdown());
     general->addChild(new NoPromptOnExit());
     general->addChild(new HaltCommand());
+    general->addChild(new LircKeyPressedApp());
     general->addChild(new SetupPinCodeRequired());
     general->addChild(new SetupPinCode());
     general->addChild(new EnableMediaMon());
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#!/bin/sh

REMOTE_NAME=GI #DVD-Panasonic-0490
KEY=EXIT

irsend SEND_ONCE $REMOTE_NAME $KEY