_file.cpp File Reference

#include <corecrt_internal_stdio.h>

Include dependency graph for _file.cpp:

Go to the source code of this file.

Functions
FILE *__cdecl	__acrt_iob_func (unsigned const id)
	_CRT_LINKER_FORCE_INCLUDE (__acrt_stdio_initializer)
	_CRT_LINKER_FORCE_INCLUDE (__acrt_stdio_terminator)
int __cdecl	__acrt_initialize_stdio ()
void __cdecl	__acrt_uninitialize_stdio ()
void __cdecl	_lock_file (FILE *const stream)
void __cdecl	_unlock_file (FILE *const stream)
errno_t __cdecl	_get_stream_buffer_pointers (FILE *const public_stream, char ***const base, char ***const ptr, int **const count)

Variables
__crt_stdio_stream_data	_iob [_IOB_ENTRIES]
__crt_stdio_stream_data **	__piob
int	_nstream
int	_cflush = 0

Function Documentation

__acrt_initialize_stdio()

int __cdecl __acrt_initialize_stdio

(

)

Definition at line 59 of file _file.cpp.

{
    #ifndef CRTDLL
    // If the user has not supplied a definition of _nstream, set it to _NSTREAM_.
    // If the user has supplied a value that is too small, set _nstream to the
    // minimum acceptable value (_IOB_ENTRIES):
    if (_nstream == 0)
    {
        _nstream = _NSTREAM_;
    }
    else if (_nstream < _IOB_ENTRIES)
    {
        _nstream = _IOB_ENTRIES;
    }
    #endif
 
    // Allocate the __piob array.  Try for _nstream entries first.  If this
    // fails, then reset _nstream to _IOB_ENTRIES an try again.  If it still
    // fails, bail out and cause CRT initialization to fail:
    __piob = _calloc_crt_t(__crt_stdio_stream_data*, _nstream).detach();
    if (!__piob)
    {
        _nstream = _IOB_ENTRIES;
 
        __piob = _calloc_crt_t(__crt_stdio_stream_data*, _nstream).detach();
        if (!__piob)
        {
            return -1;
        }
    }
 
    // Initialize the first _IOB_ENTRIES to point to the corresponding entries
    // in _iob[]:
    for (int i = 0; i != _IOB_ENTRIES; ++i)
    {
        __acrt_InitializeCriticalSectionEx(&_iob[i]._lock, _CORECRT_SPINCOUNT, 0);
        __piob[i] = &_iob[i];
 
        // For stdin, stdout, and stderr, we use _NO_CONSOLE_FILENO to allow
        // callers to distinguish between failure to open a file (-1) and a
        // program run without a console.
        intptr_t const os_handle = _osfhnd(i);
        bool const has_no_console =
            os_handle == reinterpret_cast<intptr_t>(INVALID_HANDLE_VALUE) ||
            os_handle == _NO_CONSOLE_FILENO ||
            os_handle == 0;
 
        if (has_no_console)
        {
            _iob[i]._file = _NO_CONSOLE_FILENO;
        }
    }
 
    return 0;
}

__acrt_iob_func()

FILE *__cdecl __acrt_iob_func

(

unsigned const

id

)

Definition at line 22 of file _file.cpp.

{
    return &_iob[id]._public_file;
}

__acrt_uninitialize_stdio()

void __cdecl __acrt_uninitialize_stdio

(

)

Definition at line 120 of file _file.cpp.

{
    _flushall();
    _fcloseall();
 
    for (int i = 0; i != _IOB_ENTRIES; ++i)
    {
        __acrt_stdio_free_buffer_nolock(&__piob[i]->_public_file);
        DeleteCriticalSection(&__piob[i]->_lock);
    }
 
    _free_crt(__piob);
    __piob = nullptr;
}

_CRT_LINKER_FORCE_INCLUDE() [1/2]

_CRT_LINKER_FORCE_INCLUDE

(

__acrt_stdio_initializer

)

_CRT_LINKER_FORCE_INCLUDE() [2/2]

_CRT_LINKER_FORCE_INCLUDE

(

__acrt_stdio_terminator

)

_get_stream_buffer_pointers()

errno_t __cdecl _get_stream_buffer_pointers	(	FILE *const	public_stream,
		char ***const	base,
		char ***const	ptr,
		int **const	count
	)

Definition at line 153 of file _file.cpp.

{
    _VALIDATE_RETURN_ERRCODE(public_stream != nullptr, EINVAL);
 
    __crt_stdio_stream const stream(public_stream);
    if (base)
    {
        *base = &stream->_base;
    }
 
    if (ptr)
    {
        *ptr = &stream->_ptr;
    }
 
    if (count)
    {
        *count = &stream->_cnt;
    }
 
    return 0;
}

Referenced by test_iobuf_layout().

_lock_file()

void __cdecl _lock_file

(

FILE *const

stream

)

Definition at line 138 of file _file.cpp.

{
    EnterCriticalSection(&__crt_stdio_stream(stream)->_lock);
}

_unlock_file()

void __cdecl _unlock_file

(

FILE *const

stream

)

Definition at line 146 of file _file.cpp.

{
    LeaveCriticalSection(&__crt_stdio_stream(stream)->_lock);
}

Variable Documentation

__piob

__crt_stdio_stream_data** __piob

Definition at line 30 of file _file.cpp.

Referenced by __acrt_initialize_stdio(), and __acrt_uninitialize_stdio().

_cflush

int _cflush = 0

Definition at line 53 of file _file.cpp.

Referenced by __acrt_stdio_allocate_buffer_nolock(), __acrt_stdio_begin_temporary_buffering_nolock(), __DEFINE_CPP_OVERLOAD_STANDARD_FUNC_0_0(), _setvbuf_internal(), common_fdopen(), and common_openfile().

_iob

__crt_stdio_stream_data _iob[_IOB_ENTRIES]

Initial value:

=
{
    
    {  nullptr, nullptr, 0,    _IOALLOCATED | _IOREAD,  0,     0,        0}, 
    {  nullptr, nullptr, 0,    _IOALLOCATED | _IOWRITE, 1,     0,        0}, 
    {  nullptr, nullptr, 0,    _IOALLOCATED | _IOWRITE, 2,     0,        0}, 
}

Definition at line 14 of file _file.cpp.

Referenced by __acrt_initialize_stdio(), and __acrt_iob_func().

_nstream

int _nstream

Definition at line 38 of file _file.cpp.

Referenced by __acrt_initialize_stdio().