/* $NetBSD: ftok.c,v 1.12 2018/07/26 00:05:28 kamil Exp $ */ /* * Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com> * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ #include <sys/cdefs.h> #if defined(LIBC_SCCS) && !defined(lint) __RCSID("$NetBSD: ftok.c,v 1.12 2018/07/26 00:05:28 kamil Exp $"); #endif /* LIBC_SCCS and not lint */ #include "namespace.h" #include <sys/types.h> #include <sys/stat.h> #include <sys/ipc.h> #include <assert.h> #include <errno.h> #ifdef __weak_alias __weak_alias(ftok,_ftok) #endif key_t ftok(const char *path, int id) { struct stat st; _DIAGASSERT(path != NULL); if (stat(path, &st) < 0) return (key_t)-1; return (key_t) ((unsigned int)id << 24 | (st.st_dev & 0xff) << 16 | (st.st_ino & 0xffff)); } |