Supports original and new utrace interfaces.

2008-08-20  David Smith  <dsmith@redhat.com>

        * tapsets.cxx (utrace_derived_probe_group::emit_probe_decl):
        Supports original and new utrace interfaces.
        (utrace_derived_probe_group::emit_module_decls): Ditto.

2008-08-20  David Smith  <dsmith@redhat.com>

        * task_finder.c: Supports original and new utrace interfaces.
        * utrace_compatibility.h (utrace_attach_task): Compatibility layer
        for original utrace interface.

1 files changed, 57 insertions, 0 deletions

diff --git a/runtime/utrace_compatibility.h b/runtime/utrace_compatibility.h
new file mode 100644
index 00000000..80037015
--- /dev/null
+++ b/runtime/utrace_compatibility.h
@@ -0,0 +1,57 @@
+/*
+ * utrace compatibility defines and inlines
+ * Copyright (C) 2008 Red Hat Inc.
+ *
+ * This file is part of systemtap, and is free software.  You can
+ * redistribute it and/or modify it under the terms of the GNU General
+ * Public License (GPL); either version 2, or (at your option) any
+ * later version.
+ */
+
+#ifndef _UTRACE_COMPATIBILITY_H_
+#define _UTRACE_COMPATIBILITY_H_
+
+#include <linux/utrace.h>
+
+#ifdef UTRACE_ACTION_RESUME
+
+/* 
+ * If UTRACE_ACTION_RESUME is defined after including utrace.h, we've
+ * got the original version of utrace.  So that utrace clients can be
+ * written using the new interface (mostly), provide a (very thin)
+ * compatibility layer that hides the differences.
+ */
+
+#define UTRACE_ORIG_VERSION
+
+#define UTRACE_RESUME	UTRACE_ACTION_RESUME
+#define UTRACE_DETACH	UTRACE_ACTION_DETACH
+#define UTRACE_STOP	UTRACE_ACTION_QUIESCE
+
+static inline struct utrace_attached_engine *
+utrace_attach_task(struct task_struct *target, int flags,
+		   const struct utrace_engine_ops *ops, void *data)
+{
+	return utrace_attach(target, flags, ops, data);
+}
+
+static inline int __must_check
+utrace_control(struct task_struct *target,
+	       struct utrace_attached_engine *engine,
+	       unsigned long action)
+{
+	if (action == UTRACE_DETACH)
+		return utrace_detach(target, engine);
+	return -EINVAL;
+}
+
+static inline int __must_check
+utrace_set_events(struct task_struct *target,
+		  struct utrace_attached_engine *engine,
+		  unsigned long eventmask)
+{
+	return utrace_set_flags(target, engine, eventmask);
+}
+#endif
+
+#endif	/* _UTRACE_COMPATIBILITY_H_ */