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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 #include <sys/feature_tests.h> 34 35 #if !defined(_LP64) && _FILE_OFFSET_BITS == 64 36 #define _lockf _lockf64 37 #endif 38 39 #include "synonyms.h" 40 #include <sys/types.h> 41 #include <unistd.h> 42 #include <errno.h> 43 #include <fcntl.h> 44 45 int 46 _lockf(int fildes, int function, off_t size) 47 { 48 struct flock l; 49 int rv; 50 51 l.l_whence = 1; 52 if (size < 0) { 53 l.l_start = size; 54 l.l_len = -size; 55 } else { 56 l.l_start = (off_t)0; 57 l.l_len = size; 58 } 59 switch (function) { 60 case F_ULOCK: 61 l.l_type = F_UNLCK; 62 rv = fcntl(fildes, F_SETLK, &l); 63 break; 64 case F_LOCK: 65 l.l_type = F_WRLCK; 66 rv = fcntl(fildes, F_SETLKW, &l); 67 break; 68 case F_TLOCK: 69 l.l_type = F_WRLCK; 70 rv = fcntl(fildes, F_SETLK, &l); 71 break; 72 case F_TEST: 73 l.l_type = F_WRLCK; 74 rv = fcntl(fildes, F_GETLK, &l); 75 if (rv != -1) { 76 if (l.l_type == F_UNLCK) 77 return (0); 78 else { 79 errno = EAGAIN; 80 return (-1); 81 } 82 } 83 break; 84 default: 85 errno = EINVAL; 86 return (-1); 87 } 88 if (rv < 0) { 89 switch (errno) { 90 case EMFILE: 91 case ENOSPC: 92 case ENOLCK: 93 /* 94 * A deadlock error is given if we run out of resources, 95 * in compliance with /usr/group standards. 96 */ 97 errno = EDEADLK; 98 break; 99 default: 100 break; 101 } 102 } 103 return (rv); 104 } 105