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) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #pragma weak flockfile = _flockfile 33 #pragma weak ftrylockfile = _ftrylockfile 34 #pragma weak funlockfile = _funlockfile 35 36 #include "synonyms.h" 37 #include "mtlib.h" 38 39 #define _iob __iob 40 41 #include "file64.h" 42 #include <stdio.h> 43 #include <thread.h> 44 #include <synch.h> 45 #include <stdlib.h> 46 #include <errno.h> 47 #include <stdio_ext.h> 48 #include "stdiom.h" 49 50 /* 51 * _flockget and _flockrel are only called by the 52 * FLOCKFILE/FUNLOCKFILE macros in mtlib.h. 53 */ 54 55 /* 56 * compute the lock's position, acquire it and return its pointer 57 */ 58 59 rmutex_t * 60 _flockget(FILE *iop) 61 { 62 rmutex_t *rl = IOB_LCK(iop); 63 64 if (rl != NULL) 65 cancel_safe_mutex_lock(rl); 66 return (rl); 67 } 68 69 int 70 ftrylockfile(FILE *iop) 71 { 72 rmutex_t *rl = IOB_LCK(iop); 73 74 if (rl != NULL) 75 return (mutex_trylock(rl)); 76 return (0); /* can't happen? */ 77 } 78 79 void 80 flockfile(FILE *iop) 81 { 82 rmutex_t *rl = IOB_LCK(iop); 83 84 if (rl != NULL) 85 mutex_lock(rl); 86 } 87 88 void 89 funlockfile(FILE *iop) 90 { 91 rmutex_t *rl = IOB_LCK(iop); 92 93 if (rl != NULL) 94 mutex_unlock(rl); 95 } 96 97 int 98 __fsetlocking(FILE *iop, int type) 99 { 100 int ret = 0; 101 102 ret = GET_IONOLOCK(iop) ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL; 103 104 switch (type) { 105 106 case FSETLOCKING_QUERY: 107 break; 108 109 case FSETLOCKING_INTERNAL: 110 CLEAR_IONOLOCK(iop); 111 break; 112 113 case FSETLOCKING_BYCALLER: 114 SET_IONOLOCK(iop); 115 break; 116 117 default: 118 errno = EINVAL; 119 return (-1); 120 } 121 122 return (ret); 123 } 124