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 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma weak _ftok = ftok 31 32 #include "lint.h" 33 #include "libc.h" 34 #include <sys/types.h> 35 #include <sys/stat.h> 36 #include <sys/mkdev.h> 37 #include <sys/nvpair.h> 38 #include <fcntl.h> 39 #include <attr.h> 40 41 key_t 42 ftok(const char *path, int id) 43 { 44 struct stat64 st; 45 nvlist_t *nvp; 46 uint32_t devpiece; 47 int error; 48 49 if (stat64(path, &st) < 0) 50 return ((key_t)-1); 51 52 /* 53 * if getattrat works then extract the FSID from the nvlist 54 * otherwise, just fall back and use the value from the stat data 55 */ 56 if ((error = getattrat(AT_FDCWD, XATTR_VIEW_READONLY, 57 path, &nvp)) == 0) { 58 uint64_t value; 59 60 if ((error = libc_nvlist_lookup_uint64(nvp, 61 A_FSID, &value)) == 0) 62 devpiece = value & 0xfff; 63 libc_nvlist_free(nvp); 64 } 65 66 if (error) 67 devpiece = st.st_dev & 0xfff; 68 69 return ((key_t)((key_t)id << 24 | devpiece << 12 | 70 ((uint32_t)st.st_ino & 0x0fff))); 71 } 72