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 ident "%Z%%M% %I% %E% SMI" 31 32 #include <sys/feature_tests.h> 33 34 #if !defined(_LP64) && _FILE_OFFSET_BITS == 64 35 #define __lockf __lockf64 36 #endif 37 38 #include "lint.h" 39 #include <sys/types.h> 40 #include <unistd.h> 41 #include <errno.h> 42 #include <fcntl.h> 43 44 int 45 __lockf(int fildes, int function, off_t size) 46 { 47 struct flock l; 48 int rv; 49 50 l.l_whence = 1; 51 if (size < 0) { 52 l.l_start = size; 53 l.l_len = -size; 54 } else { 55 l.l_start = (off_t)0; 56 l.l_len = size; 57 } 58 switch (function) { 59 case F_ULOCK: 60 l.l_type = F_UNLCK; 61 rv = fcntl(fildes, F_SETLK, &l); 62 break; 63 case F_LOCK: 64 l.l_type = F_WRLCK; 65 rv = fcntl(fildes, F_SETLKW, &l); 66 break; 67 case F_TLOCK: 68 l.l_type = F_WRLCK; 69 rv = fcntl(fildes, F_SETLK, &l); 70 break; 71 case F_TEST: 72 l.l_type = F_WRLCK; 73 rv = fcntl(fildes, F_GETLK, &l); 74 if (rv != -1) { 75 if (l.l_type == F_UNLCK) 76 return (0); 77 else { 78 errno = EAGAIN; 79 return (-1); 80 } 81 } 82 break; 83 default: 84 errno = EINVAL; 85 return (-1); 86 } 87 if (rv < 0) { 88 switch (errno) { 89 case EMFILE: 90 case ENOSPC: 91 case ENOLCK: 92 /* 93 * A deadlock error is given if we run out of resources, 94 * in compliance with /usr/group standards. 95 */ 96 errno = EDEADLK; 97 break; 98 default: 99 break; 100 } 101 } 102 return (rv); 103 } 104