Send the child SIGSTOPs and SIGCONTs

i3bar/include/child.h

@@ -26,4 +26,16 @@ void start_child(char *command);
  */
 void kill_child();
 
+/*
+ * Sends a SIGSTOP to the child-process (if existent)
+ *
+ */
+void stop_child();
+
+/*
+ * Sends a SIGCONT to the child-process (if existent)
+ *
+ */
+void cont_child();
+
 #endif

i3bar/src/child.c

@@ -176,7 +176,7 @@ void start_child(char *command) {
 }
 
 /*
- * kill()s the child-prozess (if existend) and closes and
+ * kill()s the child-process (if existent) and closes and
  * free()s the stdin- and sigchild-watchers
  *
  */
@@ -186,3 +186,23 @@ void kill_child() {
     }
     cleanup();
 }
+
+/*
+ * Sends a SIGSTOP to the child-process (if existent)
+ *
+ */
+void stop_child() {
+    if (child_pid != 0) {
+        kill(child_pid, SIGSTOP);
+    }
+}
+
+/*
+ * Sends a SIGCONT to the child-process (if existent)
+ *
+ */
+void cont_child() {
+    if (child_pid != 0) {
+        kill(child_pid, SIGCONT);
+    }
+}

i3bar/src/xcb.c

@@ -76,6 +76,7 @@ void hide_bars() {
     SLIST_FOREACH(walk, outputs, slist) {
         xcb_unmap_window(xcb_connection, walk->bar);
     }
+    stop_child();
 }
 
 /*
@@ -89,6 +90,8 @@ void unhide_bars() {
     uint32_t            mask;
     uint32_t            values[4];
 
+    cont_child();
+
     SLIST_FOREACH(walk, outputs, slist) {
         if (walk->bar == XCB_NONE) {
             continue;