From e6167bc9300d497b1f2edf3a307164081e24f2bd Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Tue, 6 Sep 2022 20:26:10 +0200
Subject: Set NET_WM_PID

---
 include/mgl/mgl.h   | 1 +
 src/mgl.c           | 1 +
 src/window/window.c | 7 +++++++
 3 files changed, 9 insertions(+)

diff --git a/include/mgl/mgl.h b/include/mgl/mgl.h
index 7b02ceb..4cbc8d5 100644
--- a/include/mgl/mgl.h
+++ b/include/mgl/mgl.h
@@ -13,6 +13,7 @@ struct mgl_context {
     _XVisualInfo *visual_info;
     unsigned long wm_delete_window_atom;
     unsigned long net_wm_ping_atom;
+    unsigned long net_wm_pid_atom;
 };
 
 /*
diff --git a/src/mgl.c b/src/mgl.c
index f93704e..dd5cccd 100644
--- a/src/mgl.c
+++ b/src/mgl.c
@@ -77,6 +77,7 @@ int mgl_init(void) {
         }
 
         context.net_wm_ping_atom = XInternAtom(context.connection, "_NET_WM_PING", True);
+        context.net_wm_pid_atom = XInternAtom(context.connection, "_NET_WM_PID", True);
 
         if(mgl_gl_load(&context.gl) != 0) {
             mgl_deinit();
diff --git a/src/window/window.c b/src/window/window.c
index 08c4585..c03d681 100644
--- a/src/window/window.c
+++ b/src/window/window.c
@@ -331,6 +331,13 @@ static int mgl_window_init(mgl_window *self, const char *title, const mgl_window
         context->net_wm_ping_atom
     };
     XSetWMProtocols(context->connection, self->window, wm_protocol_atoms, 2);
+
+    if(context->net_wm_pid_atom) {
+        const long pid = getpid();
+        XChangeProperty(context->connection, self->window, context->net_wm_pid_atom, XA_CARDINAL,
+                        32, PropModeReplace, (const unsigned char*)&pid, 1);
+    }
+
     XFlush(context->connection);
 
     /* TODO: Check for failure? */
-- 
cgit v1.2.3