11.12Skamil/*	$NetBSD: ftok.c,v 1.12 2018/07/26 00:05:28 kamil Exp $	*/
21.3Scgd
31.1Sjtc/*
41.1Sjtc * Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
51.1Sjtc * All rights reserved.
61.1Sjtc *
71.1Sjtc * Redistribution and use in source and binary forms, with or without
81.1Sjtc * modification, are permitted provided that the following conditions
91.1Sjtc * are met:
101.1Sjtc * 1. Redistributions of source code must retain the above copyright
111.1Sjtc *    notice, this list of conditions and the following disclaimer.
121.1Sjtc * 2. Redistributions in binary form must reproduce the above copyright
131.1Sjtc *    notice, this list of conditions and the following disclaimer in the
141.1Sjtc *    documentation and/or other materials provided with the distribution.
151.1Sjtc *
161.1Sjtc * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
171.1Sjtc * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
181.1Sjtc * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
191.1Sjtc * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
201.1Sjtc * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
211.1Sjtc * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
221.1Sjtc * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
231.1Sjtc * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
241.1Sjtc * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
251.1Sjtc * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
261.1Sjtc */
271.2Sjtc
281.4Schristos#include <sys/cdefs.h>
291.2Sjtc#if defined(LIBC_SCCS) && !defined(lint)
301.12Skamil__RCSID("$NetBSD: ftok.c,v 1.12 2018/07/26 00:05:28 kamil Exp $");
311.2Sjtc#endif /* LIBC_SCCS and not lint */
321.1Sjtc
331.5Sjtc#include "namespace.h"
341.1Sjtc#include <sys/types.h>
351.1Sjtc#include <sys/stat.h>
361.1Sjtc#include <sys/ipc.h>
371.5Sjtc
381.7Slukem#include <assert.h>
391.7Slukem#include <errno.h>
401.7Slukem
411.5Sjtc#ifdef __weak_alias
421.9Smycroft__weak_alias(ftok,_ftok)
431.5Sjtc#endif
441.1Sjtc
451.1Sjtckey_t
461.11Smattftok(const char *path, int id)
471.1Sjtc{
481.1Sjtc	struct stat st;
491.7Slukem
501.7Slukem	_DIAGASSERT(path != NULL);
511.1Sjtc
521.1Sjtc	if (stat(path, &st) < 0)
531.1Sjtc		return (key_t)-1;
541.1Sjtc
551.3Scgd	return (key_t)
561.12Skamil	    ((unsigned int)id << 24 | (st.st_dev & 0xff) << 16 |
571.12Skamil	     (st.st_ino & 0xffff));
581.1Sjtc}
59