/usr/include/freebsd/sys/queue.h is in freebsd-glue 0.2.20.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)queue.h 8.5 (Berkeley) 8/20/94
* $FreeBSD$
*/
#if defined(__FreeBSD_kernel__) && !defined(__FREEBSD_GLUE_USE_EMBEDDED_HEADERS)
#include_next <sys/queue.h> /* Supply disabled macros using the Glibc version */
#include <sys/kern/queue.h>
#else
#include_next <sys/queue.h>
#include <sys/cdefs.h>
/* Currently, Debian eglibc only defines these on kfreebsd-* platforms. */
#ifndef LIST_FOREACH_SAFE
#define LIST_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = ((head)->lh_first); \
(var) && ((tvar) = ((var)->field.le_next), 1); \
(var) = (tvar))
#endif
#ifndef SLIST_FOREACH_SAFE
#define SLIST_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = SLIST_FIRST((head)); \
(var) && ((tvar) = SLIST_NEXT((var), field), 1); \
(var) = (tvar))
#endif
#ifndef SLIST_FOREACH_PREVPTR
#define SLIST_FOREACH_PREVPTR(var, varp, head, field) \
for ((varp) = &SLIST_FIRST((head)); \
((var) = *(varp)) != NULL; \
(varp) = &SLIST_NEXT((var), field))
#endif
#ifndef STAILQ_REMOVE_HEAD_UNTIL
#define STAILQ_REMOVE_HEAD_UNTIL(head, elm, field) do { \
if (((head)->stqh_first = ((elm)->field.stqe_next)) == NULL) \
(head)->stqh_last = &((head)->stqh_first); \
} while (/*CONSTCOND*/0)
#endif
#ifndef STAILQ_FOREACH_SAFE
#define STAILQ_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = ((head)->stqh_first); \
(var) && ((tvar) = ((var)->field.stqe_next), 1); \
(var) = (tvar))
#endif
#ifndef STAILQ_LAST
#define STAILQ_LAST(head, type, field) \
(STAILQ_EMPTY((head)) ? \
NULL : \
((struct type *)(void *) \
((char *)((head)->stqh_last) - __offsetof(struct type, field))))
#endif
#ifndef TAILQ_FOREACH_SAFE
#define TAILQ_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = ((head)->tqh_first); \
(var) && ((tvar) = ((var)->field.tqe_next), 1); \
(var) = (tvar))
#endif
#endif
#ifdef TAILQ_FOREACH_REVERSE_SAFE
#undef TAILQ_FOREACH_REVERSE_SAFE
#define TAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, tvar) \
for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last)); \
(var) && ((tvar) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last)), 1); \
(var) = (tvar))
#endif
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