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 /* 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 * The rmutex_lock/unlock routines are only called (for stdio FILE 52 * locking in libc) by _flockget, _flockrel, flockfile, ftrylockfile, 53 * and funlockfile. _flockget and _flockrel are only called by the 54 * FLOCKFILE/FUNLOCKFILE macros in mtlib.h. rmutex_trylock(), as a 55 * special case, is called from GETIOP()/getiop() in _findiop(). 56 */ 57 58 /* 59 * compute the lock's position, acquire it and return its pointer 60 */ 61 62 rmutex_t * 63 _flockget(FILE *iop) 64 { 65 rmutex_t *rl = IOB_LCK(iop); 66 67 if (rl != NULL) 68 rmutex_lock(rl); 69 return (rl); 70 } 71 72 int 73 ftrylockfile(FILE *iop) 74 { 75 rmutex_t *rl = IOB_LCK(iop); 76 77 if (rl != NULL) 78 return (rmutex_trylock(rl)); 79 return (0); /* can't happen? */ 80 } 81 82 void 83 flockfile(FILE *iop) 84 { 85 rmutex_t *rl = IOB_LCK(iop); 86 87 if (rl != NULL) 88 rmutex_lock(rl); 89 } 90 91 void 92 funlockfile(FILE *iop) 93 { 94 rmutex_t *rl = IOB_LCK(iop); 95 96 if (rl != NULL) 97 rmutex_unlock(rl); 98 } 99 100 int 101 __fsetlocking(FILE *iop, int type) 102 { 103 int ret = 0; 104 105 ret = GET_IONOLOCK(iop) ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL; 106 107 switch (type) { 108 109 case FSETLOCKING_QUERY: 110 break; 111 112 case FSETLOCKING_INTERNAL: 113 CLEAR_IONOLOCK(iop); 114 break; 115 116 case FSETLOCKING_BYCALLER: 117 SET_IONOLOCK(iop); 118 break; 119 120 default: 121 errno = EINVAL; 122 return (-1); 123 } 124 125 return (ret); 126 } 127