1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* Copyright (c) 1988 AT&T */ 29 /* All Rights Reserved */ 30 31 32 #pragma weak ftok = _ftok 33 #include "synonyms.h" 34 #include "libc.h" 35 #include <sys/types.h> 36 #include <sys/stat.h> 37 #include <sys/mkdev.h> 38 #include <sys/nvpair.h> 39 #include <fcntl.h> 40 #include <attr.h> 41 42 key_t 43 ftok(const char *path, int id) 44 { 45 struct stat64 st; 46 nvlist_t *nvp; 47 uint32_t devpiece; 48 int error; 49 50 if (stat64(path, &st) < 0) 51 return ((key_t)-1); 52 53 /* 54 * if getattrat works then extract the FSID from the nvlist 55 * otherwise, just fall back and use the value from the stat data 56 */ 57 if ((error = getattrat(AT_FDCWD, XATTR_VIEW_READONLY, 58 path, &nvp)) == 0) { 59 uint64_t value; 60 61 if ((error = libc_nvlist_lookup_uint64(nvp, 62 A_FSID, &value)) == 0) 63 devpiece = value & 0xfff; 64 libc_nvlist_free(nvp); 65 } 66 67 if (error) 68 devpiece = st.st_dev & 0xfff; 69 70 return ((key_t)((key_t)id << 24 | devpiece << 12 | 71 ((uint32_t)st.st_ino & 0x0fff))); 72 } 73