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Extensible Firmware Interface Specification
11-22 12/01/02 Version 1.10
EFI_FILE.Open()
Summary
Opens a new file relative to the source file’s location.
Prototype
EFI_STATUS
(EFIAPI *EFI_FILE_OPEN) (
IN EFI_FILE *This,
OUT EFI_FILE **NewHandle,
IN CHAR16 *FileName,
IN UINT64 OpenMode,
IN UINT64 Attributes
);
Parameters
This A pointer to the EFI_FILE instance that is the file handle to the source
location. This would typically be an open handle to a directory. See the
type EFI_FILE protocol description.
NewHandle A pointer to the location to return the opened handle for the new file.
See the type EFI_FILE protocol description.
FileName The Null-terminated string of the name of the file to be opened. The file
name may contain the following path modifiers: “\”,
“.”, and “..”.
OpenMode The mode to open the file. The only valid combinations that the file may
be opened with are: Read, Read/Write, or Create/Read/Write. See
“Related Definitions” below.
Attributes Only valid for EFI_FILE_MODE_CREATE, in which case these are the
attribute bits for the newly created file. See “Related Definitions” below.
Related Definitions
//*******************************************************
// Open Modes
//*******************************************************
#define EFI_FILE_MODE_READ 0x0000000000000001
#define EFI_FILE_MODE_WRITE 0x0000000000000002
#define EFI_FILE_MODE_CREATE 0x8000000000000000
//*******************************************************
// File Attributes
//*******************************************************
#define EFI_FILE_READ_ONLY 0x0000000000000001
#define EFI_FILE_HIDDEN 0x0000000000000002
#define EFI_FILE_SYSTEM 0x0000000000000004