/usr/include/ntirpc/rpc/svc_dg.h is in libntirpc-dev 1.4.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | /*	$NetBSD: svc_dg.h,v 1.1 2000/06/02 23:11:16 fvdl Exp $	*/
/*	$FreeBSD: src/include/rpc/svc_dg.h,v 1.1 2001/03/19 12:49:47
 *	alfred Exp $ */
/*
 * Copyright (c) 2009, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - 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.
 * - Neither the name of Sun Microsystems, Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
 */
/*
 * XXX - this file exists only so that the rpcbind code can pull it in.
 * This should go away. It should only be include by svc_dg.c and
 * rpcb_svc_com.c in the rpcbind code.
 */
#ifndef _TIRPC_SVC_DG_H_
#define _TIRPC_SVC_DG_H_
#include <sys/socket.h>
#include <netinet/in.h>
/*
 * The following union is defined just to use SVC_CMSG_LEN macro for an
 * array length. _GNU_SOURCE must be defined to get in6_pktinfo
 * declaration!
 */
union in_pktinfo_u {
	struct in_pktinfo x;
	struct in6_pktinfo y;
};
#define SVC_CMSG_LEN CMSG_SPACE(sizeof(union in_pktinfo_u))
/*
 * kept in xprt->xp_p2
 */
struct svc_dg_data {
	/* XXX: optbuf should be the first field, used by ti_opts.c code */
	size_t su_iosz;		/* size of send.recv buffer */
	u_int32_t su_xid;	/* transaction id */
	XDR su_xdrs;		/* XDR handle */
	char su_verfbody[MAX_AUTH_BYTES];	/* verifier body */
	void *su_cache;		/* cached data, NULL if none */
	struct msghdr su_msghdr;	/* msghdr received from clnt */
	unsigned char su_cmsg[SVC_CMSG_LEN];	/* cmsghdr received from clnt */
};
#define __rpcb_get_dg_xidp(x) (&((struct svc_dg_data *)(x)->xp_p2)->su_xid)
#endif
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