libio/iofclose.c

   1 /* Copyright (C) 1993-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.
  17
  18    As a special exception, if you link the code in this file with
  19    files compiled with a GNU compiler to produce an executable,
  20    that does not cause the resulting executable to be covered by
  21    the GNU Lesser General Public License.  This exception does not
  22    however invalidate any other reasons why the executable file
  23    might be covered by the GNU Lesser General Public License.
  24    This exception applies to code released by its copyright holders
  25    in files containing the exception.  */
  26
  27 #include "libioP.h"
  28 #include <stdlib.h>
  29 #if _LIBC
  30 # include "../iconv/gconv_int.h"
  31 # include <shlib-compat.h>
  32 #else
  33 # define SHLIB_COMPAT(a, b, c) 0
  34 # define _IO_new_fclose fclose
  35 #endif
  36
  37 int
  38 _IO_new_fclose (_IO_FILE *fp)
  39 {
  40   int status;
  41
  42   CHECK_FILE(fp, EOF);
  43
  44 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
  45   /* We desperately try to help programs which are using streams in a
  46      strange way and mix old and new functions.  Detect old streams
  47      here.  */
  48   if (_IO_vtable_offset (fp) != 0)
  49     return _IO_old_fclose (fp);
  50 #endif
  51
  52   /* First unlink the stream.  */
  53   if (fp->_IO_file_flags & _IO_IS_FILEBUF)
  54     _IO_un_link ((struct _IO_FILE_plus *) fp);
  55
  56   _IO_acquire_lock (fp);
  57   if (fp->_IO_file_flags & _IO_IS_FILEBUF)
  58     status = _IO_file_close_it (fp);
  59   else
  60     status = fp->_flags & _IO_ERR_SEEN ? -1 : 0;
  61   _IO_release_lock (fp);
  62   _IO_FINISH (fp);
  63   if (fp->_mode > 0)
  64     {
  65 #if _LIBC
  66       /* This stream has a wide orientation.  This means we have to free
  67          the conversion functions.  */
  68       struct _IO_codecvt *cc = fp->_codecvt;
  69
  70       __libc_lock_lock (__gconv_lock);
  71       __gconv_release_step (cc->__cd_in.__cd.__steps);
  72       __gconv_release_step (cc->__cd_out.__cd.__steps);
  73       __libc_lock_unlock (__gconv_lock);
  74 #endif
  75     }
  76   else
  77     {
  78       if (_IO_have_backup (fp))
  79         _IO_free_backup_area (fp);
  80     }
  81   if (fp != _IO_stdin && fp != _IO_stdout && fp != _IO_stderr)
  82     {
  83       fp->_IO_file_flags = 0;
  84       free(fp);
  85     }
  86
  87   return status;
  88 }
  89
  90 #ifdef _LIBC
  91 versioned_symbol (libc, _IO_new_fclose, _IO_fclose, GLIBC_2_1);
  92 strong_alias (_IO_new_fclose, __new_fclose)
  93 versioned_symbol (libc, __new_fclose, fclose, GLIBC_2_1);
  94 #endif