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