sysdeps/generic/lockfile.c

   1 /* lockfile - Handle locking and unlocking of stream.  Singlethreaded version.
   2    Copyright (C) 1996,97,2000 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 #include <stdio.h>
  21
  22 #undef _IO_flockfile
  23 #undef _IO_funlockfile
  24 #undef _IO_ftrylockfile
  25
  26 void
  27 __flockfile (FILE *stream)
  28 {
  29   /* Do nothing.  Using this version does not do any locking.  */
  30 }
  31 weak_alias (__flockfile, flockfile);
  32 #ifdef USE_IN_LIBIO
  33 weak_alias (__flockfile, _IO_flockfile)
  34 #endif
  35
  36
  37 void
  38 __funlockfile (FILE *stream)
  39 {
  40   /* Do nothing.  Using this version does not do any locking.  */
  41 }
  42 #ifdef USE_IN_LIBIO
  43 weak_alias (__funlockfile, _IO_funlockfile)
  44 #endif
  45 weak_alias (__funlockfile, funlockfile);
  46
  47
  48 int
  49 __ftrylockfile (FILE *stream)
  50 {
  51   /* Do nothing.  Using this version does not do any locking.  */
  52   return 1;
  53 }
  54 weak_alias (__ftrylockfile, ftrylockfile);
  55 #ifdef USE_IN_LIBIO
  56 weak_alias (__ftrylockfile, _IO_ftrylockfile)
  57 #endif