mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-21 20:40:05 +00:00
97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
/* Copyright (C) 1993-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>.
|
|
|
|
As a special exception, if you link the code in this file with
|
|
files compiled with a GNU compiler to produce an executable,
|
|
that does not cause the resulting executable to be covered by
|
|
the GNU Lesser General Public License. This exception does not
|
|
however invalidate any other reasons why the executable file
|
|
might be covered by the GNU Lesser General Public License.
|
|
This exception applies to code released by its copyright holders
|
|
in files containing the exception. */
|
|
|
|
#include "libioP.h"
|
|
#include <fcntl.h>
|
|
#include <stdlib.h>
|
|
#include <stddef.h>
|
|
#include <shlib-compat.h>
|
|
|
|
FILE *
|
|
__fopen_maybe_mmap (FILE *fp)
|
|
{
|
|
#if _G_HAVE_MMAP
|
|
if ((fp->_flags2 & _IO_FLAGS2_MMAP) && (fp->_flags & _IO_NO_WRITES))
|
|
{
|
|
/* Since this is read-only, we might be able to mmap the contents
|
|
directly. We delay the decision until the first read attempt by
|
|
giving it a jump table containing functions that choose mmap or
|
|
vanilla file operations and reset the jump table accordingly. */
|
|
|
|
if (fp->_mode <= 0)
|
|
_IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps_maybe_mmap;
|
|
else
|
|
_IO_JUMPS_FILE_plus (fp) = &_IO_wfile_jumps_maybe_mmap;
|
|
fp->_wide_data->_wide_vtable = &_IO_wfile_jumps_maybe_mmap;
|
|
}
|
|
#endif
|
|
return fp;
|
|
}
|
|
|
|
|
|
FILE *
|
|
__fopen_internal (const char *filename, const char *mode, int is32)
|
|
{
|
|
struct locked_FILE
|
|
{
|
|
struct _IO_FILE_plus fp;
|
|
#ifdef _IO_MTSAFE_IO
|
|
_IO_lock_t lock;
|
|
#endif
|
|
struct _IO_wide_data wd;
|
|
} *new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
|
|
|
|
if (new_f == NULL)
|
|
return NULL;
|
|
#ifdef _IO_MTSAFE_IO
|
|
new_f->fp.file._lock = &new_f->lock;
|
|
#endif
|
|
_IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, &_IO_wfile_jumps);
|
|
_IO_JUMPS (&new_f->fp) = &_IO_file_jumps;
|
|
_IO_new_file_init_internal (&new_f->fp);
|
|
if (_IO_file_fopen ((FILE *) new_f, filename, mode, is32) != NULL)
|
|
return __fopen_maybe_mmap (&new_f->fp.file);
|
|
|
|
_IO_un_link (&new_f->fp);
|
|
free (new_f);
|
|
return NULL;
|
|
}
|
|
|
|
FILE *
|
|
_IO_new_fopen (const char *filename, const char *mode)
|
|
{
|
|
return __fopen_internal (filename, mode, 1);
|
|
}
|
|
|
|
strong_alias (_IO_new_fopen, __new_fopen)
|
|
versioned_symbol (libc, _IO_new_fopen, _IO_fopen, GLIBC_2_1);
|
|
versioned_symbol (libc, __new_fopen, fopen, GLIBC_2_1);
|
|
|
|
# if !defined O_LARGEFILE || O_LARGEFILE == 0
|
|
weak_alias (_IO_new_fopen, _IO_fopen64)
|
|
weak_alias (_IO_new_fopen, fopen64)
|
|
# endif
|