Add API call to kill processes on the system

pid = <pid>
signal = {INT|QUIT|ABRT|KILL|ALRM|TERM}

REST Request:
-------------------------------
PUT /sysadm/systemmanager
{
   "signal" : "KILL",
   "pid" : "13939",
   "action" : "killproc"
}

REST Response:
-------------------------------
{
    "args": {
        "killproc": {
            "action": "killproc",
            "pid": "13939",
            "signal": "KILL"
        }
    }
}

WebSocket Request:
-------------------------------
{
   "namespace" : "sysadm",
   "args" : {
      "pid" : "13939",
      "action" : "killproc",
      "signal" : "KILL"
   },
   "id" : "fooid",
   "name" : "systemmanager"
}

WebSocket Response:
-------------------------------
{
  "args": {
    "killproc": {
      "action": "killproc",
      "pid": "13939",
      "signal": "KILL"
    }
  },
  "id": "fooid",
  "name": "response",
  "namespace": "sysadm"
}

src/server/WebBackend.cpp

@@ -100,7 +100,7 @@ RestOutputStruct::ExitCode WebSocket::EvaluateBackendRequest(const RestInputStru
     return EvaluateSysadmNetworkRequest(IN.args, out);
   }else if(namesp=="rpc" && name=="syscache"){
     return EvaluateSyscacheRequest(IN.args, out);
-  }else if(namesp=="sysadm" && name=="systeminfo"){
+  }else if(namesp=="sysadm" && name=="systemmanager"){
     return EvaluateSysadmSystemMgmtRequest(IN.args, out);
   }else if(namesp=="sysadm" && name=="update"){
     return EvaluateSysadmUpdateRequest(IN.args, out);
@@ -317,6 +317,10 @@ RestOutputStruct::ExitCode WebSocket::EvaluateSysadmSystemMgmtRequest(const QJso
 	ok = true;
         out->insert("externalmounts", sysadm::SysMgmt::externalDevicePaths());
       }
+      if(act=="killproc"){
+	ok = true;
+        out->insert("killproc", sysadm::SysMgmt::killProc(in_args.toObject()));
+      }
       if(act=="memorystats"){
 	ok = true;
         out->insert("memorystats", sysadm::SysMgmt::memoryStats());

src/server/library/sysadm-systemmanager.cpp

@@ -161,6 +161,49 @@ QJsonObject SysMgmt::externalDevicePaths() {
   return retObject;
 }
 
+// Kill a process
+QJsonObject SysMgmt::killProc(QJsonObject jsin) {
+  QJsonObject retObject;
+
+  QStringList keys = jsin.keys();
+  if (! keys.contains("pid") ) {
+    retObject.insert("error", "Missing required key 'pid'");
+    return retObject;
+  }
+  // Save the target
+  QString pid, sig, tmp;
+  pid = jsin.value("pid").toString();
+
+  if ( keys.contains("signal") ) {
+    tmp  = jsin.value("signal").toString();
+    if ( tmp == "HUP" ) {
+      sig = "-1";
+    } else if ( tmp == "INT" ) {
+      sig = "-2";
+    } else if ( tmp == "QUIT" ) {
+      sig = "-3";
+    } else if ( tmp == "ABRT" ) {
+      sig = "-6";
+    } else if ( tmp == "KILL" ) {
+      sig = "-9";
+    } else if ( tmp == "ALRM" ) {
+      sig = "-14";
+    } else if ( tmp == "TERM" ) {
+      sig = "-15";
+    } else {
+      retObject.insert("error", "Invalid signal! (INT|QUIT|ABRT|KILL|ALRM|TERM)");
+      return retObject;
+    }
+  } else {
+    sig = "-9";
+  }
+
+  // This could be switched to kill(2) at some point
+  General::RunCommand("kill " + sig + " "  + pid);
+
+  return jsin;
+}
+
 // Return information about memory
 QJsonObject SysMgmt::memoryStats() {
   QJsonObject retObject;

src/server/library/sysadm-systemmanager.h

@@ -18,9 +18,10 @@ public:
 	static QJsonObject cpuPercentage();
 	static QJsonObject cpuTemps();
 	static QJsonObject externalDevicePaths();
+	static QJsonObject killProc(QJsonObject);
 	static QJsonObject memoryStats();
-	static QJsonObject systemInfo();
 	static QJsonObject procInfo();
+	static QJsonObject systemInfo();
 };
 	
 } //end of pcbsd namespace