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