public static SafeFileHandle OpenHandle(string fullPath, bool asDirectory, bool writeMode = false, bool backupMode = false, bool asyncMode = true, int additionalFlags = 0)
{
string root = fullPath.Substring(0, Win32PathInternal.GetRootLength(fullPath.AsSpan()));
if (root == fullPath && root[1] == Path.VolumeSeparatorChar)
{
// intentionally not fullpath, most upstack public APIs expose this as path.
throw new ArgumentException("path");
}
if (asyncMode)
{
additionalFlags |= (int)FileOptions.Asynchronous;
}
using (Lfs.EnterDisableMediaInsertionPrompt())
{
SafeFileHandle handle = Win32Api.Kernel32.CreateFile(
fullPath,
writeMode ? Win32Api.Kernel32.GenericOperations.GENERIC_WRITE | Win32Api.Kernel32.GenericOperations.GENERIC_READ : Win32Api.Kernel32.GenericOperations.GENERIC_READ,
FileShare.ReadWrite | FileShare.Delete,
FileMode.Open,
((asDirectory || backupMode) ? Win32Api.Kernel32.FileOperations.FILE_FLAG_BACKUP_SEMANTICS : 0) | additionalFlags);
if (handle.IsInvalid)
{
int errorCode = Marshal.GetLastWin32Error();
// NT5 oddity - when trying to open "C:\" as a File,
// we usually get ERROR_PATH_NOT_FOUND from the OS. We should
// probably be consistent w/ every other directory.
if (!asDirectory && errorCode == Win32Api.Errors.ERROR_PATH_NOT_FOUND && fullPath.Equals(Directory.GetDirectoryRoot(fullPath)))
{
errorCode = Win32Api.Errors.ERROR_ACCESS_DENIED;
}
throw PalWin32FileStream.GetExceptionForWin32Error(errorCode, fullPath);
}
handle._EnsureThreadPoolBindingInitialized();
return(handle);
}
}