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glibc/libio/iofopen.c
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/* Copyright (C) 1993,1997,1998,1999,2000,2002 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, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. | |
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" | |
#ifdef __STDC__ | |
#include <stdlib.h> | |
#include <stddef.h> | |
#endif | |
#ifdef _LIBC | |
# include <shlib-compat.h> | |
#else | |
# define _IO_new_fopen fopen | |
#endif | |
_IO_FILE * | |
__fopen_maybe_mmap (fp) | |
_IO_FILE *fp; | |
{ | |
#ifdef _G_HAVE_MMAP | |
if (fp->_flags & _IO_NO_WRITES) | |
{ | |
/* We use the file in read-only mode. This could mean we can | |
mmap the file and use it without any copying. But not all | |
file descriptors are for mmap-able objects and on 32-bit | |
machines we don't want to map files which are too large since | |
this would require too much virtual memory. */ | |
struct _G_stat64 st; | |
if (_IO_SYSSTAT (fp, &st) == 0 | |
&& S_ISREG (st.st_mode) && st.st_size != 0 | |
/* Limit the file size to 1MB for 32-bit machines. */ | |
&& (sizeof (ptrdiff_t) > 4 || st.st_size < 1*1024*1024) | |
/* Sanity check. */ | |
&& (fp->_offset == _IO_pos_BAD || fp->_offset <= st.st_size)) | |
{ | |
/* Try to map the file. */ | |
void *p; | |
# ifdef _G_MMAP64 | |
p = _G_MMAP64 (NULL, st.st_size, PROT_READ, MAP_PRIVATE, | |
fp->_fileno, 0); | |
# else | |
p = __mmap (NULL, st.st_size, PROT_READ, MAP_PRIVATE, | |
fp->_fileno, 0); | |
# endif | |
if (p != MAP_FAILED) | |
{ | |
/* OK, we managed to map the file. Set the buffer up | |
and use a special jump table with simplified | |
underflow functions which never tries to read | |
anything from the file. */ | |
INTUSE(_IO_setb) (fp, p, (char *) p + st.st_size, 0); | |
if (fp->_offset == _IO_pos_BAD) | |
fp->_offset = 0; | |
_IO_setg (fp, p, p + fp->_offset, p + fp->_offset); | |
if (fp->_mode <= 0) | |
_IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_file_jumps_mmap; | |
else | |
_IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_wfile_jumps_mmap; | |
fp->_wide_data->_wide_vtable = &_IO_wfile_jumps_mmap; | |
} | |
} | |
} | |
#endif | |
return fp; | |
} | |
_IO_FILE * | |
__fopen_internal (filename, mode, is32) | |
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 | |
#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T | |
_IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, &INTUSE(_IO_wfile_jumps)); | |
#else | |
_IO_no_init (&new_f->fp.file, 1, 0, NULL, NULL); | |
#endif | |
_IO_JUMPS (&new_f->fp) = &INTUSE(_IO_file_jumps); | |
INTUSE(_IO_file_init) (&new_f->fp); | |
#if !_IO_UNIFIED_JUMPTABLES | |
new_f->fp.vtable = NULL; | |
#endif | |
if (INTUSE(_IO_file_fopen) ((_IO_FILE *) new_f, filename, mode, is32) | |
!= NULL) | |
return __fopen_maybe_mmap (&new_f->fp.file); | |
INTUSE(_IO_un_link) (&new_f->fp); | |
free (new_f); | |
return NULL; | |
} | |
_IO_FILE * | |
_IO_new_fopen (filename, mode) | |
const char *filename; | |
const char *mode; | |
{ | |
return __fopen_internal (filename, mode, 1); | |
} | |
#ifdef _LIBC | |
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); | |
#endif |