libroot: added ability to communicate with the launch_daemon.

* These methods don't really work yet, as BMessage doesn't support
  replying with a KMessage; the request is received, but the reply
  never gets to the target.

headers/private/libroot/launch.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2015, Axel Dörfler, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _LIBROOT_LAUNCH_H
+#define _LIBROOT_LAUNCH_H
+
+
+#include <LaunchDaemonDefs.h>
+#include <OS.h>
+
+
+#ifdef __cplusplus
+namespace BPrivate {
+
+
+class KMessage;
+
+
+port_id		get_launch_daemon_port();
+status_t	send_request_to_launch_daemon(KMessage& request, KMessage& reply);
+status_t	get_launch_data(const char* signature, KMessage& data);
+
+
+}	// namespace BPrivate
+#endif	// __cplusplus
+
+
+#endif	// _LIBROOT_LAUNCH_H

src/kits/app/Jamfile

@@ -18,7 +18,7 @@ if $(RUN_WITHOUT_APP_SERVER) != 0 {
 }
 
 UseLibraryHeaders icon ;
-UsePrivateHeaders shared app interface kernel locale notification ;
+UsePrivateHeaders shared app interface kernel libroot locale notification ;
 
 SetSubDirSupportedPlatforms haiku libbe_test ;
 

src/kits/app/LaunchRoster.cpp

@@ -12,6 +12,7 @@
 #include <Application.h>
 #include <String.h>
 
+#include <launch.h>
 #include <LaunchDaemonDefs.h>
 #include <MessengerPrivate.h>
 
@@ -107,7 +108,7 @@ void
 BLaunchRoster::_InitMessenger()
 {
 	// find the launch_daemon port
-	port_id daemonPort = find_port(B_LAUNCH_DAEMON_PORT_NAME);
+	port_id daemonPort = BPrivate::get_launch_daemon_port();
 	port_info info;
 	if (daemonPort >= 0 && get_port_info(daemonPort, &info) == B_OK) {
 		BMessenger::Private(fMessenger).SetTo(info.team, daemonPort,

src/system/libroot/os/Jamfile

@@ -2,7 +2,7 @@ SubDir HAIKU_TOP src system libroot os ;
 
 UsePrivateHeaders kernel ;
 	# for util/KMessage.h
-UsePrivateHeaders libroot runtime_loader shared ;
+UsePrivateHeaders app libroot runtime_loader shared ;
 
 local architectureObject ;
 for architectureObject in [ MultiArchSubDirSetup ] {
@@ -28,6 +28,7 @@ for architectureObject in [ MultiArchSubDirSetup ] {
 			fs_query.cpp
 			fs_volume.c
 			image.cpp
+			launch.cpp
 			memory.cpp
 			parsedate.cpp
 			port.c

src/system/libroot/os/launch.cpp

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2015, Axel Dörfler, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <launch.h>
+
+#include <TokenSpace.h>
+#include <util/KMessage.h>
+
+
+static port_id sLaunchDaemonPort = -1;
+
+
+port_id
+BPrivate::get_launch_daemon_port()
+{
+	if (sLaunchDaemonPort < 0)
+		sLaunchDaemonPort = find_port(B_LAUNCH_DAEMON_PORT_NAME);
+
+	return sLaunchDaemonPort;
+}
+
+
+status_t
+BPrivate::send_request_to_launch_daemon(KMessage& request, KMessage& reply)
+{
+	status_t status = request.SendTo(get_launch_daemon_port(),
+		B_PREFERRED_TOKEN, &reply);
+	if (status != B_OK)
+		return status;
+
+	return (status_t)reply.What();
+}
+
+
+status_t
+BPrivate::get_launch_data(const char* signature, KMessage& data)
+{
+	BPrivate::KMessage request(B_GET_LAUNCH_DATA);
+	request.AddString("name", signature);
+
+	return BPrivate::send_request_to_launch_daemon(request, data);
+}