diff --git a/hw/dmx/dmxinit.c b/hw/dmx/dmxinit.c
index 07154d648..ddb331090 100644
--- a/hw/dmx/dmxinit.c
+++ b/hw/dmx/dmxinit.c
@@ -838,6 +838,15 @@ ddxGiveUp(enum ExitCode error)
     AbortDDX(error);
 }
 
+#if INPUTTHREAD
+/** This function is called in Xserver/os/inputthread.c when starting
+    the input thread. */
+void
+ddxInputThreadInit(void)
+{
+}
+#endif
+
 /** This function is called in Xserver/os/osinit.c from \a OsInit(). */
 void
 OsVendorInit(void)
diff --git a/hw/kdrive/ephyr/ephyrinit.c b/hw/kdrive/ephyr/ephyrinit.c
index abc35dfca..47bd97ade 100644
--- a/hw/kdrive/ephyr/ephyrinit.c
+++ b/hw/kdrive/ephyr/ephyrinit.c
@@ -100,6 +100,15 @@ CloseInput(void)
     KdCloseInput();
 }
 
+#if INPUTTHREAD
+/** This function is called in Xserver/os/inputthread.c when starting
+    the input thread. */
+void
+ddxInputThreadInit(void)
+{
+}
+#endif
+
 #ifdef DDXBEFORERESET
 void
 ddxBeforeReset(void)
diff --git a/hw/vfb/InitOutput.c b/hw/vfb/InitOutput.c
index 407f2afcd..d9f23f360 100644
--- a/hw/vfb/InitOutput.c
+++ b/hw/vfb/InitOutput.c
@@ -232,6 +232,15 @@ ddxBeforeReset(void)
 }
 #endif
 
+#if INPUTTHREAD
+/** This function is called in Xserver/os/inputthread.c when starting
+    the input thread. */
+void
+ddxInputThreadInit(void)
+{
+}
+#endif
+
 void
 ddxUseMsg(void)
 {
diff --git a/hw/xfree86/common/xf86Init.c b/hw/xfree86/common/xf86Init.c
index fc60f68d3..0b5724d67 100644
--- a/hw/xfree86/common/xf86Init.c
+++ b/hw/xfree86/common/xf86Init.c
@@ -1444,3 +1444,12 @@ ddxBeforeReset(void)
 {
 }
 #endif
+
+#if INPUTTHREAD
+/** This function is called in Xserver/os/inputthread.c when starting
+    the input thread. */
+void
+ddxInputThreadInit(void)
+{
+}
+#endif
diff --git a/hw/xnest/Init.c b/hw/xnest/Init.c
index b45685216..c3afadf8c 100644
--- a/hw/xnest/Init.c
+++ b/hw/xnest/Init.c
@@ -169,3 +169,12 @@ ddxBeforeReset(void)
     return;
 }
 #endif
+
+#if INPUTTHREAD
+/** This function is called in Xserver/os/inputthread.c when starting
+    the input thread. */
+void
+ddxInputThreadInit(void)
+{
+}
+#endif
diff --git a/hw/xwayland/xwayland.c b/hw/xwayland/xwayland.c
index baa08d87b..324c68ccf 100644
--- a/hw/xwayland/xwayland.c
+++ b/hw/xwayland/xwayland.c
@@ -72,6 +72,15 @@ ddxBeforeReset(void)
 {
     return;
 }
+#endif
+
+#if INPUTTHREAD
+/** This function is called in Xserver/os/inputthread.c when starting
+    the input thread. */
+void
+ddxInputThreadInit(void)
+{
+}
 #endif
 
  _X_NORETURN
diff --git a/hw/xwin/InitOutput.c b/hw/xwin/InitOutput.c
index 9560c5684..1c6fa9fd9 100644
--- a/hw/xwin/InitOutput.c
+++ b/hw/xwin/InitOutput.c
@@ -151,6 +151,15 @@ ddxBeforeReset(void)
 }
 #endif
 
+#if INPUTTHREAD
+/** This function is called in Xserver/os/inputthread.c when starting
+    the input thread. */
+void
+ddxInputThreadInit(void)
+{
+}
+#endif
+
 int
 main(int argc, char *argv[], char *envp[])
 {
diff --git a/include/os.h b/include/os.h
index 3646194a0..2a1c29ef3 100644
--- a/include/os.h
+++ b/include/os.h
@@ -556,6 +556,8 @@ extern _X_EXPORT void
 AbortDDX(enum ExitCode error);
 extern _X_EXPORT void
 ddxGiveUp(enum ExitCode error);
+extern _X_EXPORT void
+ddxInputThreadInit(void);
 extern _X_EXPORT int
 TimeSinceLastInputEvent(void);
 
diff --git a/os/inputthread.c b/os/inputthread.c
index 97e59d21f..e6694afda 100644
--- a/os/inputthread.c
+++ b/os/inputthread.c
@@ -318,6 +318,8 @@ InputThreadDoWork(void *arg)
     sigfillset(&set);
     pthread_sigmask(SIG_BLOCK, &set, NULL);
 
+    ddxInputThreadInit();
+
     inputThreadInfo->running = TRUE;
 
 #if defined(HAVE_PTHREAD_SETNAME_NP_WITH_TID)