From e13605ea40cfc671314a0086c75b917564298b55 Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Tue, 23 Jun 2009 14:09:22 +1000
Subject: [PATCH] dix: introduce "Xtst Device" label property.

Xtst devices get this property assigned automatically so they can be
detected easily by a client.
The property is read-only.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
---
 Xi/xiproperty.c              |  1 +
 dix/devices.c                | 25 +++++++++++++++++++++++++
 include/xserver-properties.h |  2 ++
 3 files changed, 28 insertions(+)

diff --git a/Xi/xiproperty.c b/Xi/xiproperty.c
index 396061f80..55f20c402 100644
--- a/Xi/xiproperty.c
+++ b/Xi/xiproperty.c
@@ -51,6 +51,7 @@ static struct dev_properties
     char *name;
 } dev_properties[] = {
     {0, XI_PROP_ENABLED},
+    {0, XI_PROP_XTST_DEVICE},
     {0, XATOM_FLOAT},
     {0, ACCEL_PROP_PROFILE_NUMBER},
     {0, ACCEL_PROP_CONSTANT_DECELERATION},
diff --git a/dix/devices.c b/dix/devices.c
index b7f21927f..a99d046a5 100644
--- a/dix/devices.c
+++ b/dix/devices.c
@@ -2562,6 +2562,19 @@ AllocDevicePair (ClientPtr client, char* name,
     return Success;
 }
 
+/**
+ * Don't allow changing the Xtst property.
+ */
+static int
+DeviceSetXtstProperty(DeviceIntPtr dev, Atom property,
+                      XIPropertyValuePtr prop, BOOL checkonly)
+{
+    if (property == XIGetKnownProperty(XI_PROP_XTST_DEVICE))
+        return BadAccess;
+
+    return Success;
+}
+
 /**
  * Allocate a device pair that is initialised as a slave
  * device with properties that identify the devices as belonging
@@ -2576,6 +2589,7 @@ int AllocXtstDevice (ClientPtr client, char* name,
     int retval;
     int len = strlen(name);
     char *xtstname = xcalloc(len + 6, 1 );
+    char dummy = 1;
 
     strncpy( xtstname, name, len);
     strncat( xtstname, " Xtst", 5 );
@@ -2588,6 +2602,17 @@ int AllocXtstDevice (ClientPtr client, char* name,
 
     xfree( xtstname );
 
+    XIChangeDeviceProperty(*ptr, XIGetKnownProperty(XI_PROP_XTST_DEVICE),
+                           XA_INTEGER, 8, PropModeReplace, 1, &dummy,
+                           FALSE);
+    XISetDevicePropertyDeletable(*ptr, XIGetKnownProperty(XI_PROP_XTST_DEVICE), FALSE);
+    XIRegisterPropertyHandler(*ptr, DeviceSetXtstProperty, NULL, NULL);
+    XIChangeDeviceProperty(*keybd, XIGetKnownProperty(XI_PROP_XTST_DEVICE),
+                           XA_INTEGER, 8, PropModeReplace, 1, &dummy,
+                           FALSE);
+    XISetDevicePropertyDeletable(*keybd, XIGetKnownProperty(XI_PROP_XTST_DEVICE), FALSE);
+    XIRegisterPropertyHandler(*keybd, DeviceSetXtstProperty, NULL, NULL);
+
     return retval;
 }
 
diff --git a/include/xserver-properties.h b/include/xserver-properties.h
index 9b3b7bf8d..0f18dbc45 100644
--- a/include/xserver-properties.h
+++ b/include/xserver-properties.h
@@ -32,6 +32,8 @@
 
 /* BOOL. 0 - device disabled, 1 - device enabled */
 #define XI_PROP_ENABLED      "Device Enabled"
+/* BOOL. If present, device is a virtual Xtst device */
+#define XI_PROP_XTST_DEVICE  "Xtst Device"
 
 /* Pointer acceleration properties */
 /* INTEGER of any format */