1: /* Copyright (C) 1993,1997,1998,1999,2000,2002,2003
    2:         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:    As a special exception, if you link the code in this file with
   21:    files compiled with a GNU compiler to produce an executable,
   22:    that does not cause the resulting executable to be covered by
   23:    the GNU Lesser General Public License.  This exception does not
   24:    however invalidate any other reasons why the executable file
   25:    might be covered by the GNU Lesser General Public License.
   26:    This exception applies to code released by its copyright holders
   27:    in files containing the exception.  */
   28: 
   29: #include "libioP.h"
   30: #ifdef __STDC__
   31: #include <stdlib.h>
   32: #include <stddef.h>
   33: #endif
   34: #ifdef _LIBC
   35: # include <shlib-compat.h>
   36: #else
   37: # define _IO_new_fopen fopen
   38: #endif
   39: 
   40: _IO_FILE *
   41: __fopen_maybe_mmap (fp)
   42:      _IO_FILE *fp;
   43: {
   44: #ifdef _G_HAVE_MMAP
   45:   if ((fp->_flags2 & _IO_FLAGS2_MMAP) && (fp->_flags & _IO_NO_WRITES))
   46:     {
   47:       /* Since this is read-only, we might be able to mmap the contents
   48:          directly.  We delay the decision until the first read attempt by
   49:          giving it a jump table containing functions that choose mmap or
   50:          vanilla file operations and reset the jump table accordingly.  */
   51: 
   52:       if (fp->_mode <= 0)
   53:         _IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_file_jumps_maybe_mmap;
   54:       else
   55:         _IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_wfile_jumps_maybe_mmap;
   56:       fp->_wide_data->_wide_vtable = &_IO_wfile_jumps_maybe_mmap;
   57:     }
   58: #endif
   59:   return fp;
   60: }
   61: 
   62: 
   63: _IO_FILE *
   64: __fopen_internal (filename, mode, is32)
   65:      const char *filename;
   66:      const char *mode;
   67:      int is32;
   68: {
   69:   struct locked_FILE
   70:   {
   71:     struct _IO_FILE_plus fp;
   72: #ifdef _IO_MTSAFE_IO
   73:     _IO_lock_t lock;
   74: #endif
   75:     struct _IO_wide_data wd;
   76:   } *new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
   77: 
   78:   if (new_f == NULL)
   79:     return NULL;
   80: #ifdef _IO_MTSAFE_IO
   81:   new_f->fp.file._lock = &new_f->lock;
   82: #endif
   83: #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
   84:   _IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, &_IO_wfile_jumps);
   85: #else
   86:   _IO_no_init (&new_f->fp.file, 1, 0, NULL, NULL);
   87: #endif
   88:   _IO_JUMPS (&new_f->fp) = &_IO_file_jumps;
   89:   INTUSE(_IO_file_init) (&new_f->fp);
   90: #if  !_IO_UNIFIED_JUMPTABLES
   91:   new_f->fp.vtable = NULL;
   92: #endif
   93:   if (INTUSE(_IO_file_fopen) ((_IO_FILE *) new_f, filename, mode, is32)
   94:       != NULL)
   95:     return __fopen_maybe_mmap (&new_f->fp.file);
   96: 
   97:   INTUSE(_IO_un_link) (&new_f->fp);
   98:   free (new_f);
   99:   return NULL;
  100: }
  101: 
  102: _IO_FILE *
  103: _IO_new_fopen (filename, mode)
  104:      const char *filename;
  105:      const char *mode;
  106: {
  107:   return __fopen_internal (filename, mode, 1);
  108: }
  109: 
  110: #ifdef _LIBC
  111: strong_alias (_IO_new_fopen, __new_fopen)
  112: versioned_symbol (libc, _IO_new_fopen, _IO_fopen, GLIBC_2_1);
  113: versioned_symbol (libc, __new_fopen, fopen, GLIBC_2_1);
  114: #endif