Get rid of const warnings in XSERVER_INPUT_EVENT dtrace probe calls

Use typedefs to work around dtrace dropping const qualifiers from probe
arguments when generating Xserver-dtrace.h.   Add new probes.h header to
avoid having to replicate these typedefs in every file with dtrace probes.

Gets rid of these warnings from gcc 4.8:
 getevents.c:1096:9:
  warning: passing argument 6 of '__dtrace_Xserver___input__event' discards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1096:9:
  warning: passing argument 7 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1651:9:
  warning: passing argument 6 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1651:9:
  warning: passing argument 7 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1791:9:
  warning: passing argument 6 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1791:9:
  warning: passing argument 7 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1921:9:
  warning: passing argument 6 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1921:9:
  warning: passing argument 7 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

dix/Xserver.d

@@ -31,6 +31,9 @@
 #include <sys/types.h>
 #endif
 
+typedef const uint8_t *const_uint8_p;
+typedef const double *const_double_p;
+
 provider Xserver {
 	/* reqType, data, length, client id, request buffer */
 	probe request__start(string, uint8_t, uint16_t, int, void *);
@@ -49,7 +52,7 @@ provider Xserver {
 	/* client id, event type, event* */
 	probe send__event(int, uint8_t, void *);
 	/* deviceid, type, button/keycode/touchid, flags, nvalues, mask, values */
-	probe input__event(int, int, uint32_t, uint32_t, int8_t, uint8_t*, double*);
+	probe input__event(int, int, uint32_t, uint32_t, int8_t, const_uint8_p, const_double_p);
 };
 
 #pragma D attributes Unstable/Unstable/Common provider Xserver provider

dix/dispatch.c

@@ -131,10 +131,7 @@ int ProcInitialConnection();
 
 #ifdef XSERVER_DTRACE
 #include "registry.h"
-#include <sys/types.h>
-typedef const char *string;
-
-#include "Xserver-dtrace.h"
+#include "probes.h"
 #endif
 
 #define mskcnt ((MAXCLIENTS + 31) / 32)

dix/events.c

@@ -125,13 +125,7 @@ Equipment Corporation.
 #include <X11/extensions/XKBproto.h>
 #include "xkbsrv.h"
 #include "xace.h"
-
-#ifdef XSERVER_DTRACE
-#include <sys/types.h>
-typedef const char *string;
-
-#include "Xserver-dtrace.h"
-#endif
+#include "probes.h"
 
 #include <X11/extensions/XIproto.h>
 #include <X11/extensions/XI2proto.h>

dix/getevents.c

@@ -68,12 +68,7 @@
 #include "exevents.h"
 #include "extnsionst.h"
 #include "listdev.h"            /* for sizing up DeviceClassesChangedEvent */
-
-#if XSERVER_DTRACE
-#include <sys/types.h>
-typedef const char *string;
-#include <Xserver-dtrace.h>
-#endif
+#include "probes.h"
 
 /* Number of motion history events to store. */
 #define MOTION_HISTORY_SIZE 256

dix/resource.c

@@ -144,10 +144,7 @@ Equipment Corporation.
 #include "gcstruct.h"
 
 #ifdef XSERVER_DTRACE
-#include <sys/types.h>
-typedef const char *string;
-
-#include "Xserver-dtrace.h"
+#include "probes.h"
 
 #define TypeNameString(t) LookupResourceName(t)
 #endif

include/Makefile.am

@@ -71,6 +71,7 @@ EXTRA_DIST = 	\
 	busfault.h dbus-core.h \
 	dix-config-apple-verbatim.h \
 	dixfontstubs.h eventconvert.h eventstr.h inpututils.h \
+	probes.h \
 	protocol-versions.h \
 	systemd-logind.h \
 	xsha1.h

include/probes.h

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef XORG_PROBES_H
+#define XORG_PROBES_H
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+/* definitions needed to include Dtrace probes in a source file */
+
+#if XSERVER_DTRACE
+#include <sys/types.h>
+typedef const char *string;
+typedef const uint8_t *const_uint8_p;
+typedef const double *const_double_p;
+#include "../dix/Xserver-dtrace.h"
+#endif
+
+#endif /* XORG_PROBES_H */

os/connection.c

@@ -113,17 +113,11 @@ SOFTWARE.
 #ifdef HAVE_GETPEERUCRED
 #include <ucred.h>
 #include <zone.h>
-#endif
-
-#ifdef XSERVER_DTRACE
-#include <sys/types.h>
-typedef const char *string;
-
-#ifndef HAVE_GETPEERUCRED
+#else
 #define zoneid_t int
 #endif
-#include "../dix/Xserver-dtrace.h"
-#endif
+
+#include "probes.h"
 
 static int lastfdesc;           /* maximum file descriptor */