xnu-6153.121.1.tar.gz

[apple/xnu.git] / bsd / sys / sdt.h

diff --git a/bsd/sys/sdt.h b/bsd/sys/sdt.h
index 420956bdb5c20f69aa4e488dbf37ef135ccad112..9799cb8430390253ca2c90894775f4cde9d1e4a5 100644 (file)
--- a/bsd/sys/sdt.h
+++ b/bsd/sys/sdt.h
@@ -25,17 +25,23 @@
  */
 
 #ifndef _SYS_SDT_H
-#define        _SYS_SDT_H
+#define _SYS_SDT_H
 
 /*
  * This is a wrapper header that wraps the mach visible sdt.h header so that
- * the header file ends up vidible where software expects it to be.  We also
+ * the header file ends up visible where software expects it to be.  We also
  * do the C/C++ symbol wrapping here, since Mach headers are technically C
  * interfaces.
+ *
+ * Note:  The process of adding USDT probes to code is slightly different
+ * than documented in the "Solaris Dynamic Tracing Guide".
+ * The DTRACE_PROBE*() macros are not supported on Mac OS X -- instead see
+ * "BUILDING CODE CONTAINING USDT PROBES" in the dtrace(1) manpage
+ *
  */
 #include <sys/cdefs.h>
 __BEGIN_DECLS
 #include <mach/sdt.h>
 __END_DECLS
 
-#endif /* _SYS_SDT_H */
+#endif  /* _SYS_SDT_H */