StdLib/LibC/Stdio/fileext.h

   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