| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- S Y S T E M . M M A P . O S _ I N T E R F A C E -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 2007-2021, AdaCore -- |
| -- -- |
| -- This library is free software; you can redistribute it and/or modify it -- |
| -- under terms of the GNU General Public License as published by the Free -- |
| -- Software Foundation; either version 3, or (at your option) any later -- |
| -- version. This library is distributed in the hope that it will be useful, -- |
| -- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- -- |
| -- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- OS pecularities abstraction package for Win32 systems. |
| |
| package System.Mmap.OS_Interface is |
| |
| -- The Win package contains copy of definition found in recent System.Win32 |
| -- unit provided with the GNAT compiler. The copy is needed to be able to |
| -- compile this unit with older compilers. Note that this internal Win |
| -- package can be removed when GNAT 6.1.0 is not supported anymore. |
| |
| package Win is |
| |
| subtype PVOID is Standard.System.Address; |
| |
| type HANDLE is new Interfaces.C.ptrdiff_t; |
| |
| type WORD is new Interfaces.C.unsigned_short; |
| type DWORD is new Interfaces.C.unsigned_long; |
| type LONG is new Interfaces.C.long; |
| type SIZE_T is new Interfaces.C.size_t; |
| |
| type BOOL is new Interfaces.C.int; |
| for BOOL'Size use Interfaces.C.int'Size; |
| |
| FALSE : constant := 0; |
| |
| GENERIC_READ : constant := 16#80000000#; |
| GENERIC_WRITE : constant := 16#40000000#; |
| OPEN_EXISTING : constant := 3; |
| |
| type OVERLAPPED is record |
| Internal : DWORD; |
| InternalHigh : DWORD; |
| Offset : DWORD; |
| OffsetHigh : DWORD; |
| hEvent : HANDLE; |
| end record; |
| |
| type SECURITY_ATTRIBUTES is record |
| nLength : DWORD; |
| pSecurityDescriptor : PVOID; |
| bInheritHandle : BOOL; |
| end record; |
| |
| type SYSTEM_INFO is record |
| dwOemId : DWORD; |
| dwPageSize : DWORD; |
| lpMinimumApplicationAddress : PVOID; |
| lpMaximumApplicationAddress : PVOID; |
| dwActiveProcessorMask : PVOID; |
| dwNumberOfProcessors : DWORD; |
| dwProcessorType : DWORD; |
| dwAllocationGranularity : DWORD; |
| wProcessorLevel : WORD; |
| wProcessorRevision : WORD; |
| end record; |
| type LP_SYSTEM_INFO is access all SYSTEM_INFO; |
| |
| INVALID_HANDLE_VALUE : constant HANDLE := -1; |
| FILE_BEGIN : constant := 0; |
| FILE_SHARE_READ : constant := 16#00000001#; |
| FILE_ATTRIBUTE_NORMAL : constant := 16#00000080#; |
| FILE_MAP_COPY : constant := 1; |
| FILE_MAP_READ : constant := 4; |
| FILE_MAP_WRITE : constant := 2; |
| PAGE_READONLY : constant := 16#0002#; |
| PAGE_READWRITE : constant := 16#0004#; |
| INVALID_FILE_SIZE : constant := 16#FFFFFFFF#; |
| |
| function CreateFile |
| (lpFileName : Standard.System.Address; |
| dwDesiredAccess : DWORD; |
| dwShareMode : DWORD; |
| lpSecurityAttributes : access SECURITY_ATTRIBUTES; |
| dwCreationDisposition : DWORD; |
| dwFlagsAndAttributes : DWORD; |
| hTemplateFile : HANDLE) return HANDLE; |
| pragma Import (Stdcall, CreateFile, "CreateFileW"); |
| |
| function WriteFile |
| (hFile : HANDLE; |
| lpBuffer : Standard.System.Address; |
| nNumberOfBytesToWrite : DWORD; |
| lpNumberOfBytesWritten : access DWORD; |
| lpOverlapped : access OVERLAPPED) return BOOL; |
| pragma Import (Stdcall, WriteFile, "WriteFile"); |
| |
| function ReadFile |
| (hFile : HANDLE; |
| lpBuffer : Standard.System.Address; |
| nNumberOfBytesToRead : DWORD; |
| lpNumberOfBytesRead : access DWORD; |
| lpOverlapped : access OVERLAPPED) return BOOL; |
| pragma Import (Stdcall, ReadFile, "ReadFile"); |
| |
| function CloseHandle (hObject : HANDLE) return BOOL; |
| pragma Import (Stdcall, CloseHandle, "CloseHandle"); |
| |
| function GetFileSize |
| (hFile : HANDLE; lpFileSizeHigh : access DWORD) return DWORD; |
| pragma Import (Stdcall, GetFileSize, "GetFileSize"); |
| |
| function SetFilePointer |
| (hFile : HANDLE; |
| lDistanceToMove : LONG; |
| lpDistanceToMoveHigh : access LONG; |
| dwMoveMethod : DWORD) return DWORD; |
| pragma Import (Stdcall, SetFilePointer, "SetFilePointer"); |
| |
| function CreateFileMapping |
| (hFile : HANDLE; |
| lpSecurityAttributes : access SECURITY_ATTRIBUTES; |
| flProtect : DWORD; |
| dwMaximumSizeHigh : DWORD; |
| dwMaximumSizeLow : DWORD; |
| lpName : Standard.System.Address) return HANDLE; |
| pragma Import (Stdcall, CreateFileMapping, "CreateFileMappingW"); |
| |
| function MapViewOfFile |
| (hFileMappingObject : HANDLE; |
| dwDesiredAccess : DWORD; |
| dwFileOffsetHigh : DWORD; |
| dwFileOffsetLow : DWORD; |
| dwNumberOfBytesToMap : SIZE_T) return Standard.System.Address; |
| pragma Import (Stdcall, MapViewOfFile, "MapViewOfFile"); |
| |
| function UnmapViewOfFile |
| (lpBaseAddress : Standard.System.Address) return BOOL; |
| pragma Import (Stdcall, UnmapViewOfFile, "UnmapViewOfFile"); |
| |
| procedure GetSystemInfo (lpSystemInfo : LP_SYSTEM_INFO); |
| pragma Import (Stdcall, GetSystemInfo, "GetSystemInfo"); |
| |
| end Win; |
| |
| type System_File is record |
| Handle : Win.HANDLE; |
| |
| Mapped : Boolean; |
| -- Whether mapping is requested by the user and available on the system |
| |
| Mapping_Handle : Win.HANDLE; |
| |
| Write : Boolean; |
| -- Whether this file can be written to |
| |
| Length : File_Size; |
| -- Length of the file. Used to know what can be mapped in the file |
| end record; |
| |
| type System_Mapping is record |
| Address : Standard.System.Address; |
| Length : File_Size; |
| end record; |
| |
| Invalid_System_File : constant System_File := |
| (Win.INVALID_HANDLE_VALUE, False, Win.INVALID_HANDLE_VALUE, False, 0); |
| Invalid_System_Mapping : constant System_Mapping := |
| (Standard.System.Null_Address, 0); |
| |
| function Open_Read |
| (Filename : String; |
| Use_Mmap_If_Available : Boolean := True) return System_File; |
| -- Open a file for reading and return the corresponding System_File. Return |
| -- Invalid_System_File if unsuccessful. |
| |
| function Open_Write |
| (Filename : String; |
| Use_Mmap_If_Available : Boolean := True) return System_File; |
| -- Likewise for writing to a file |
| |
| procedure Close (File : in out System_File); |
| -- Close a system file |
| |
| function Read_From_Disk |
| (File : System_File; |
| Offset, Length : File_Size) return System.Strings.String_Access; |
| -- Read a fragment of a file. It is up to the caller to free the result |
| -- when done with it. |
| |
| procedure Write_To_Disk |
| (File : System_File; |
| Offset, Length : File_Size; |
| Buffer : System.Strings.String_Access); |
| -- Write some content to a fragment of a file |
| |
| procedure Create_Mapping |
| (File : System_File; |
| Offset, Length : in out File_Size; |
| Mutable : Boolean; |
| Mapping : out System_Mapping); |
| -- Create a memory mapping for the given File, for the area starting at |
| -- Offset and containing Length bytes. Store it to Mapping. |
| -- Note that Offset and Length may be modified according to the system |
| -- needs (for boudaries, for instance). The caller must cope with actually |
| -- wider mapped areas. |
| |
| procedure Dispose_Mapping |
| (Mapping : in out System_Mapping); |
| -- Unmap a previously-created mapping |
| |
| function Get_Page_Size return File_Size; |
| -- Return the number of bytes in a system page. |
| |
| end System.Mmap.OS_Interface; |
