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fileext.h revision 1.1.2.4 
      1 /* $NetBSD: fileext.h,v 1.1.2.4 2002/02/07 20:40:33 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 #endif
     43 };
     44 
     45 #define _EXT(fp) ((struct __sfileext *)(void *)((fp)->_ext._base))
     46 #define _UB(fp) _EXT(fp)->_ub
     47 #ifdef _REENTRANT
     48 #define _LOCK(fp) (_EXT(fp)->_lock)
     49 #define _LOCKCOND(fp) (_EXT(fp)->_lockcond)
     50 #define _LOCKOWNER(fp) (_EXT(fp)->_lockowner)
     51 #define _LOCKCOUNT(fp) (_EXT(fp)->_lockcount)
     52 #define _FILEEXT_SETUP(f, fext) do { \
     53 	/* LINTED */(f)->_ext._base = (unsigned char *)(fext); \
     54 	mutex_init(&_LOCK(f), NULL); \
     55 	cond_init(&_LOCKCOND(f), 0, NULL); \
     56 	_LOCKOWNER(f) = NULL; \
     57 	_LOCKCOUNT(f) = 0; \
     58 	} while (/* LINTED */ 0)
     59 #else
     60 #define _FILEEXT_SETUP(f, fext) /* LINTED */(f)->_ext._base = (unsigned char *)(fext)
     61 #endif
     62