1 /* $OpenBSD: fileext.h,v 1.2 2005/06/17 20:40:32 espie Exp $ */ 2 /* $NetBSD: fileext.h,v 1.5 2003/07/18 21:46:41 nathanw Exp $ */ 3 4 /*- 5 * Copyright (c)2001 Citrus Project, 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $Citrus$ 30 */ 31 32 #include <pthread.h> 33 #include "wcio.h" 34 35 /* 36 * file extension 37 */ 38 struct __sfileext { 39 struct __sbuf _ub; /* ungetc buffer */ 40 struct wchar_io_data _wcio; /* wide char io status */ 41 pthread_mutex_t _lock; /* file lock */ 42 }; 43 44 #define _FILEEXT_INITIALIZER {{NULL,0},{0},PTHREAD_RECURSIVE_MUTEX_INITIALIZER} 45 46 #define _EXT(fp) ((struct __sfileext *)((fp)->_ext._base)) 47 #define _UB(fp) _EXT(fp)->_ub 48 #define _FLOCK(fp) _EXT(fp)->_lock 49 50 #define _FILEEXT_INIT(fp) \ 51 do { \ 52 _UB(fp)._base = NULL; \ 53 _UB(fp)._size = 0; \ 54 WCIO_INIT(fp); \ 55 _FLOCK_INIT(fp); \ 56 } while (0) 57 58 /* Helper macros to avoid a function call when you know that fp is not NULL. 59 * Notice that we keep _FLOCK_INIT() fast by slightly breaking our pthread 60 * encapsulation. 61 */ 62 #define _FLOCK_INIT(fp) _FLOCK(fp).value = __PTHREAD_RECURSIVE_MUTEX_INIT_VALUE 63 #define _FLOCK_LOCK(fp) pthread_mutex_lock(&_FLOCK(fp)) 64 #define _FLOCK_TRYLOCK(fp) pthread_mutex_trylock(&_FLOCK(fp)) 65 #define _FLOCK_UNLOCK(fp) pthread_mutex_unlock(&_FLOCK(fp)) 66 67 #define _FILEEXT_SETUP(f, fext) \ 68 do { \ 69 (f)->_ext._base = (unsigned char *)(fext); \ 70 _FILEEXT_INIT(f); \ 71 } while (0) 72
