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 #include <sys/feature_tests.h> 31 32 #if !defined(_LP64) && _FILE_OFFSET_BITS == 64 33 #define __lockf __lockf64 34 #endif 35 36 #include "lint.h" 37 #include <sys/types.h> 38 #include <unistd.h> 39 #include <errno.h> 40 #include <fcntl.h> 41 42 int 43 __lockf(int fildes, int function, off_t size) 44 { 45 struct flock l; 46 int rv; 47 48 l.l_whence = 1; 49 if (size < 0) { 50 l.l_start = size; 51 l.l_len = -size; 52 } else { 53 l.l_start = (off_t)0; 54 l.l_len = size; 55 } 56 switch (function) { 57 case F_ULOCK: 58 l.l_type = F_UNLCK; 59 rv = fcntl(fildes, F_SETLK, &l); 60 break; 61 case F_LOCK: 62 l.l_type = F_WRLCK; 63 rv = fcntl(fildes, F_SETLKW, &l); 64 break; 65 case F_TLOCK: 66 l.l_type = F_WRLCK; 67 rv = fcntl(fildes, F_SETLK, &l); 68 break; 69 case F_TEST: 70 l.l_type = F_WRLCK; 71 rv = fcntl(fildes, F_GETLK, &l); 72 if (rv != -1) { 73 if (l.l_type == F_UNLCK) 74 return (0); 75 else { 76 errno = EAGAIN; 77 return (-1); 78 } 79 } 80 break; 81 default: 82 errno = EINVAL; 83 return (-1); 84 } 85 if (rv < 0) { 86 switch (errno) { 87 case EMFILE: 88 case ENOSPC: 89 case ENOLCK: 90 /* 91 * A deadlock error is given if we run out of resources, 92 * in compliance with /usr/group standards. 93 */ 94 errno = EDEADLK; 95 break; 96 default: 97 break; 98 } 99 } 100 return (rv); 101 } 102