1 /* $NetBSD: fileext.h,v 1.5 2003/07/18 21:46:41 nathanw Exp $ */ 2 3 /*- 4 * Copyright (c)2001 Citrus Project, 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $Citrus$ 29 */ 30 31 /* 32 * file extension 33 */ 34 struct __sfileext { 35 struct __sbuf _ub; /* ungetc buffer */ 36 struct wchar_io_data _wcio; /* wide char i/o status */ 37 #ifdef _REENTRANT 38 mutex_t _lock; /* Lock for FLOCKFILE/FUNLOCKFILE */ 39 cond_t _lockcond; /* Condition variable for signalling lock releases */ 40 thr_t _lockowner; /* The thread currently holding the lock */ 41 int _lockcount; /* Count of recursive locks */ 42 int _lockinternal; /* Flag of whether the lock is held inside stdio */ 43 int _lockcancelstate; /* Stashed cancellation state on internal lock */ 44 #endif 45 }; 46 47 #define _EXT(fp) ((struct __sfileext *)(void *)((fp)->_ext._base)) 48 #define _UB(fp) _EXT(fp)->_ub 49 #ifdef _REENTRANT 50 #define _LOCK(fp) (_EXT(fp)->_lock) 51 #define _LOCKCOND(fp) (_EXT(fp)->_lockcond) 52 #define _LOCKOWNER(fp) (_EXT(fp)->_lockowner) 53 #define _LOCKCOUNT(fp) (_EXT(fp)->_lockcount) 54 #define _LOCKINTERNAL(fp) (_EXT(fp)->_lockinternal) 55 #define _LOCKCANCELSTATE(fp) (_EXT(fp)->_lockcancelstate) 56 #define _FILEEXT_SETUP(f, fext) do { \ 57 /* LINTED */(f)->_ext._base = (unsigned char *)(fext); \ 58 mutex_init(&_LOCK(f), NULL); \ 59 cond_init(&_LOCKCOND(f), 0, NULL); \ 60 _LOCKOWNER(f) = NULL; \ 61 _LOCKCOUNT(f) = 0; \ 62 _LOCKINTERNAL(f) = 0; \ 63 } while (/* LINTED */ 0) 64 #else 65 #define _FILEEXT_SETUP(f, fext) /* LINTED */(f)->_ext._base = (unsigned char *)(fext) 66 #endif 67
