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Provide Xorg/net wm process ID (#7445)

Adding support for _NET_WM_PID as defined in Extended Window Manager Hints
Move verbose messaging to setupXorgTopLevelWindow method as Xorg messages should only occur when running in Xorg env.
Irrlicht returns the XDisplay as a void* and XWindow as an unsigned long so reinterpret those as the appropriate type. Also fixed a spaces for tab formating issue
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thoughtjigs authored and SmallJoker committed Jun 17, 2018
1 parent ac6e8e2 commit 3d516079eb4d535326dbf6752088d5dfeb46ed31
Showing with 109 additions and 14 deletions.
  1. +3 −5 src/client/clientlauncher.cpp
  2. +104 −7 src/client/renderingengine.cpp
  3. +2 −2 src/client/renderingengine.h
@@ -96,15 +96,13 @@ bool ClientLauncher::run(GameParams &game_params, const Settings &cmd_args)
return true;

video::IVideoDriver *video_driver = RenderingEngine::get_video_driver();
if (video_driver == NULL) {
if (RenderingEngine::get_video_driver() == NULL) {
errorstream << "Could not initialize video driver." << std::endl;
return false;

RenderingEngine::setXorgClassHint(video_driver->getExposedVideoData(), PROJECT_NAME_C);


This changes the minimum allowed number of vertices in a VBO.
Default is 500.
@@ -43,6 +43,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#ifdef XORG_USED
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>

#ifdef __ANDROID__
@@ -186,23 +187,119 @@ bool RenderingEngine::print_video_modes()
return videomode_list != NULL;

void RenderingEngine::setXorgClassHint(
const video::SExposedVideoData &video_data, const std::string &name)
bool RenderingEngine::setupTopLevelWindow(const std::string &name)
// FIXME: It would make more sense for there to be a switch of some
// sort here that would call the correct toplevel setup methods for
// the environment Minetest is running in but for now not deviating
// from the original pattern.

/* Setting Xorg properties for the top level window */
/* Done with Xorg properties */

/* Setting general properties for the top level window */
verbosestream << "Client: Configuring general top level"
<< " window properties"
<< std::endl;

bool result = setWindowIcon();

verbosestream << "Client: Finished configuring general top level"
<< " window properties"
<< std::endl;
/* Done with general properties */

// FIXME: setWindowIcon returns a bool result but it is unused.
// For now continue to return this result.
return result;

void RenderingEngine::setupTopLevelXorgWindow(const std::string &name)
#ifdef XORG_USED
if (video_data.OpenGLLinux.X11Display == NULL)
const video::SExposedVideoData exposedData = driver->getExposedVideoData();

Display *x11_dpl = reinterpret_cast<Display *>(exposedData.OpenGLLinux.X11Display);
if (x11_dpl == NULL) {
warningstream << "Client: Could not find X11 Display in ExposedVideoData"
<< std::endl;

verbosestream << "Client: Configuring Xorg specific top level"
<< " window properties"
<< std::endl;

Window x11_win = reinterpret_cast<Window>(exposedData.OpenGLLinux.X11Window);

// Set application name and class hints. For now name and class are the same.
XClassHint *classhint = XAllocClassHint();
classhint->res_name = (char *)name.c_str();
classhint->res_class = (char *)name.c_str();
classhint->res_name = const_cast<char *>(name.c_str());
classhint->res_class = const_cast<char *>(name.c_str());

XSetClassHint((Display *)video_data.OpenGLLinux.X11Display,
video_data.OpenGLLinux.X11Window, classhint);
XSetClassHint(x11_dpl, x11_win, classhint);

// FIXME: In the future WMNormalHints should be set ... e.g see the
// gtk/gdk code (gdk/x11/gdksurface-x11.c) for the setup_top_level
// method. But for now (as it would require some significant changes)
// leave the code as is.

// The following is borrowed from the above gdk source for setting top
// level windows. The source indicates and the Xlib docs suggest that
// this will set the WM_CLIENT_MACHINE and WM_LOCAL_NAME. This will not
// set the WM_CLIENT_MACHINE to a Fully Qualified Domain Name (FQDN) which is
// required by the Extended Window Manager Hints (EWMH) spec when setting
// the _NET_WM_PID (see further down) but running Minetest in an env
// where the window manager is on another machine from Minetest (therefore
// making the PID useless) is not expected to be a problem. Further
// more, using gtk/gdk as the model it would seem that not using a FQDN is
// not an issue for modern Xorg window managers.

verbosestream << "Client: Setting Xorg window manager Properties"
<< std::endl;

XSetWMProperties (x11_dpl, x11_win, NULL, NULL, NULL, 0, NULL, NULL, NULL);

// Set the _NET_WM_PID window property according to the EWMH spec. _NET_WM_PID
// (in conjunction with WM_CLIENT_MACHINE) can be used by window managers to
// force a shutdown of an application if it doesn't respond to the destroy
// window message.

verbosestream << "Client: Setting Xorg _NET_WM_PID extened window manager property"
<< std::endl;

Atom NET_WM_PID = XInternAtom(x11_dpl, "_NET_WM_PID", false);

pid_t pid = getpid();
infostream << "Client: PID is '" << static_cast<long>(pid) << "'"
<< std::endl;

XChangeProperty(x11_dpl, x11_win, NET_WM_PID,
XA_CARDINAL, 32, PropModeReplace,
reinterpret_cast<unsigned char *>(&pid),1);

// Set the WM_CLIENT_LEADER window property here. Minetest has only one
// window and that window will always be the leader.

verbosestream << "Client: Setting Xorg WM_CLIENT_LEADER property"
<< std::endl;

Atom WM_CLIENT_LEADER = XInternAtom(x11_dpl, "WM_CLIENT_LEADER", false);

XChangeProperty (x11_dpl, x11_win, WM_CLIENT_LEADER,
XA_WINDOW, 32, PropModeReplace,
reinterpret_cast<unsigned char *>(&x11_win), 1);

verbosestream << "Client: Finished configuring Xorg specific top level"
<< " window properties"
<< std::endl;

bool RenderingEngine::setWindowIcon()
#if defined(XORG_USED)
@@ -51,8 +51,8 @@ class RenderingEngine
static float getDisplayDensity();
static v2u32 getDisplaySize();

static void setXorgClassHint(const video::SExposedVideoData &video_data,
const std::string &name);
bool setupTopLevelWindow(const std::string &name);
void setupTopLevelXorgWindow(const std::string &name);
bool setWindowIcon();
bool setXorgWindowIconFromPath(const std::string &icon_file);
static bool print_video_modes();

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