stdio-common/stdio_ext.h

   1 /* Functions to access FILE structure internals.
   2    Copyright (C) 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /* This header contains the same definitions as the header of the same name
  21    on Sun's Solaris OS.  */
  22
  23 #ifndef _STDIO_EXT_H
  24 #define _STDIO_EXT_H    1
  25
  26 #include <stdio.h>
  27
  28 enum
  29 {
  30   /* Query current state of the locking status.  */
  31   FSETLOCKING_QUERY = 0,
  32 #define FSETLOCKING_QUERY       FSETLOCKING_QUERY
  33   /* The library protects all uses of the stream functions, except for
  34      uses of the *_unlocked functions, by calls equivalent to flockfile().  */
  35   FSETLOCKING_INTERNAL,
  36 #define FSETLOCKING_INTERNAL    FSETLOCKING_INTERNAL
  37   /* The user will take care of locking.  */
  38   FSETLOCKING_BYCALLER
  39 #define FSETLOCKING_BYCALLER    FSETLOCKING_BYCALLER
  40 };
  41
  42
  43 __BEGIN_DECLS
  44
  45 /* Return the size of the buffer of FP in bytes currently in use by
  46    the given stream.  */
  47 extern size_t __fbufsize (FILE *__fp);
  48
  49
  50 /* Return non-zero value iff the stream FP is opened readonly, or if the
  51    last operation on the stream was a read operation.  */
  52 extern int __freading (FILE *__fp);
  53
  54 /* Return non-zero value iff the stream FP is opened write-only or
  55    append-only, or if the last operation on the stream was a write
  56    operation.  */
  57 extern int __fwriting (FILE *__fp);
  58
  59
  60 /* Return non-zero value iff stream FP is not opened write-only or
  61    append-only.  */
  62 extern int __freadable (FILE *__fp);
  63
  64 /* Return non-zero value iff stream FP is not opened read-only.  */
  65 extern int __fwritable (FILE *__fp);
  66
  67
  68 /* Return non-zero value iff the stream FP is line-buffered.  */
  69 extern int __flbf (FILE *__fp);
  70
  71
  72 /* Discard all pending buffered I/O on the stream FP.  */
  73 extern void __fpurge (FILE *__fp);
  74
  75 /* Return amount of output in bytes pending on a stream FP.  */
  76 extern size_t __fpending (FILE *__fp);
  77
  78 /* Flush all line-buffered files.  */
  79 extern void _flushlbf (void);
  80
  81
  82 /* Set locking statis of stream FP to TYPE.  */
  83 extern int __fsetlocking (FILE *__fp, int __type);
  84
  85 __END_DECLS
  86
  87 #endif  /* stdio_ext.h */