undefined symbol: MapViewOfFile2

[zux0x3a]

Zig Version

0.13.0

Steps to Reproduce and Observed Output

it seems MapViewOfFile2 is not declared or linked into Zig code base yet, currently i am declaring it externally :

pub extern "kernel32" fn MapViewOfFile2(
    FileMappingHandle: HANDLE,
    ProcessHandle: HANDLE,
    Offset: u64, 
    BaseAddress: ?*anyopaque, 
    ViewSize: usize, // SIZE_T
    AllocationType: u32, // ULONG
    PageProtection: u32, // ULONG
) callconv(WINAPI) ?*anyopaque; 

raising the following linking error :

error: warning(link): unexpected LLD stderr:
lld-link: warning: undefined symbol: MapViewOfFile2

any alternative solution? if we imported the C headeand then call it from it's name space should be a temporary solution?

Expected Output

error: warning(link): unexpected LLD stderr:
lld-link: warning: undefined symbol: MapViewOfFile2

[zux0x3a]

it seems it is not part of Mingw64 https://github.com/msys2-contrib/mingw-w64/blob/master/mingw-w64-headers/include/memoryapi.h

[nektro]

msdn https://learn.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-mapviewoffile2

[zux0x3a]

@nektro I think you are referring to the following

pub extern "api-ms-win-core-memory-l1-1-5" fn UnmapViewOfFile2(
    Process: ?HANDLE,
    BaseAddress: ?*anyopaque,
    UnmapFlags: UNMAP_VIEW_OF_FILE_FLAGS,
) callconv(@import("std").os.windows.WINAPI) BOOL;

and thats limited to windows10.0.15063 check out here : https://github.com/marlersoft/zigwin32/blob/32d085ee67374ad2ec24fc012e6876ca27958fb7/win32/system/memory.zig#L1098

[mesidex]

As a workaround, does NtMapViewOfSection suit your use case?

zig/lib/std/os/windows/ntdll.zig

Line 144 in e163ae7

pub extern "ntdll" fn NtMapViewOfSection(

[zux0x3a]

@mesidex NtMapViewofSection is different than MapViewFile2, however i managed to make it work with following extern API inline call.

https://learn.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-mapviewoffilenuma2

pub extern "api-ms-win-core-memory-l1-1-5" fn MapViewOfFileNuma2(
    FileMappingHandle: HANDLE,
    ProcessHandle: HANDLE,
    Offset: u64, // ULONG64
    BaseAddress: ?*anyopaque, // PVOID (optional)
    ViewSize: usize, // SIZE_T
    AllocationType: u32, // ULONG
    PageProtection: u32, // ULONG
) callconv(windows.WINAPI) ?*anyopaque; // Returns PVOID

[vtorri]

I have it:

$ fgrep -r MapViewOfFile2 /mingw64/include/memoryapi.h
  WINBASEAPI PVOID MapViewOfFile2(HANDLE FileMappingHandle, HANDLE ProcessHandle, ULONG64 Offset, PVOID BaseAddress, SIZE_T ViewSize, ULONG AllocationType, ULONG PageProtection);

[alexrp]

The problem is that it isn't present in any of MinGW-w64's library definition files. Someone needs to file a bug or send a patch upstream.

[vtorri]

I use mingw since around 2008, and there is no problem with this function. mingw-w64 provides the header files and the import libraries. The DLL is in the system. I used it for example in the EFL and I compile on Windows and cross compile on linux without any problem

[alexrp]

The only occurrence of MapViewOfFile2 in the MinGW-w64 source tree is in mingw-w64-headers/include/memoryapi.h. I don't see it mentioned in any of the import libraries.

[leecannon]

From MSDN:

This function is implemented as an inline function in the header and can't be found in any export library or DLL. It's the same as calling MapViewOfFileNuma2 with the last parameter set to NUMA_NO_PREFERRED_NODE.