/usr/include/libzfs/sys/sdt.h is in libzfslinux-dev 0.6.5.6-0ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_SDT_H
#define _SYS_SDT_H
#ifndef _KERNEL
#define ZFS_PROBE(a) ((void) 0)
#define ZFS_PROBE1(a, c) ((void) 0)
#define ZFS_PROBE2(a, c, e) ((void) 0)
#define ZFS_PROBE3(a, c, e, g) ((void) 0)
#define ZFS_PROBE4(a, c, e, g, i) ((void) 0)
#define ZFS_SET_ERROR(err) ((void) 0)
#else
#if defined(HAVE_DECLARE_EVENT_CLASS)
#include <sys/trace.h>
/*
* The set-error SDT probe is extra static, in that we declare its fake
* function literally, rather than with the DTRACE_PROBE1() macro. This is
* necessary so that SET_ERROR() can evaluate to a value, which wouldn't
* be possible if it required multiple statements (to declare the function
* and then call it).
*
* SET_ERROR() uses the comma operator so that it can be used without much
* additional code. For example, "return (EINVAL);" becomes
* "return (SET_ERROR(EINVAL));". Note that the argument will be evaluated
* twice, so it should not have side effects (e.g. something like:
* "return (SET_ERROR(log_error(EINVAL, info)));" would log the error twice).
*/
#define SET_ERROR(err) \
(trace_zfs_set__error(__FILE__, __func__, __LINE__, err), err)
#else
#undef SET_ERROR
#define SET_ERROR(err) (err)
#endif /* HAVE_DECLARE_EVENT_CLASS */
#endif /* _KERNEL */
#endif /* _SYS_SDT_H */
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