windowsCreateProcess

fn windowsCreateProcess(
    app_name: [*:0]u16,
    cmd_line: [*:0]u16,
    env_block: ?process.Environ.WindowsBlock,
    cwd_ptr: ?[*:0]u16,
    flags: windows.CreateProcessFlags,
    lpStartupInfo: *windows.STARTUPINFOW,
    lpProcessInformation: *windows.PROCESS.INFORMATION,
) !void {
    const syscall: Syscall = try .start();
    while (true) {
        if (windows.kernel32.CreateProcessW(
            app_name,
            cmd_line,
            null,
            null,
            .TRUE,
            flags,
            if (env_block) |block| block.slice.ptr else null,
            cwd_ptr,
            lpStartupInfo,
            lpProcessInformation,
        ).toBool()) {
            return syscall.finish();
        } else switch (windows.GetLastError()) {
            .INVALID_PARAMETER => unreachable,
            .OPERATION_ABORTED => {
                try syscall.checkCancel();
                continue;
            },
            .FILE_NOT_FOUND => return syscall.fail(error.FileNotFound),
            .PATH_NOT_FOUND => return syscall.fail(error.FileNotFound),
            .DIRECTORY => return syscall.fail(error.FileNotFound),
            .ACCESS_DENIED => return syscall.fail(error.AccessDenied),
            .INVALID_NAME => return syscall.fail(error.InvalidName),
            .FILENAME_EXCED_RANGE => return syscall.fail(error.NameTooLong),
            .SHARING_VIOLATION => return syscall.fail(error.FileBusy),
            .COMMITMENT_LIMIT => return syscall.fail(error.SystemResources),

            // These are all the system errors that are mapped to ENOEXEC by
            // the undocumented _dosmaperr (old CRT) or __acrt_errno_map_os_error
            // (newer CRT) functions. Their code can be found in crt/src/dosmap.c (old SDK)
            // or urt/misc/errno.cpp (newer SDK) in the Windows SDK.
            .BAD_FORMAT,
            .INVALID_STARTING_CODESEG, // MIN_EXEC_ERROR in errno.cpp
            .INVALID_STACKSEG,
            .INVALID_MODULETYPE,
            .INVALID_EXE_SIGNATURE,
            .EXE_MARKED_INVALID,
            .BAD_EXE_FORMAT,
            .ITERATED_DATA_EXCEEDS_64k,
            .INVALID_MINALLOCSIZE,
            .DYNLINK_FROM_INVALID_RING,
            .IOPL_NOT_ENABLED,
            .INVALID_SEGDPL,
            .AUTODATASEG_EXCEEDS_64k,
            .RING2SEG_MUST_BE_MOVABLE,
            .RELOC_CHAIN_XEEDS_SEGLIM,
            .INFLOOP_IN_RELOC_CHAIN, // MAX_EXEC_ERROR in errno.cpp
            // This one is not mapped to ENOEXEC but it is possible, for example
            // when calling CreateProcessW on a plain text file with a .exe extension
            .EXE_MACHINE_TYPE_MISMATCH,
            => return syscall.fail(error.InvalidExe),

            else => |err| {
                syscall.finish();
                return windows.unexpectedError(err);
            },
        }
    }
}