/// <summary>Initializes the memory-mapped file handle.</summary>
/// <param name="fileStream">The underlying file stream; may be null.</param>
/// <param name="ownsFileStream">Whether this SafeHandle is responsible for Disposing the fileStream.</param>
/// <param name="inheritability">The inheritability of the memory-mapped file.</param>
/// <param name="access">The access for the memory-mapped file.</param>
/// <param name="options">The options for the memory-mapped file.</param>
/// <param name="capacity">The capacity of the memory-mapped file.</param>
internal SafeMemoryMappedFileHandle(
FileStream?fileStream, bool ownsFileStream, HandleInheritability inheritability,
MemoryMappedFileAccess access, MemoryMappedFileOptions options,
long capacity)
: base(ownsHandle: true)
{
Debug.Assert(!ownsFileStream || fileStream != null, "We can only own a FileStream we're actually given.");
// Store the arguments. We'll actually open the map when the view is created.
_fileStream = fileStream;
_ownsFileStream = ownsFileStream;
_inheritability = inheritability;
_access = access;
_options = options;
_capacity = capacity;
IntPtr handlePtr;
if (fileStream != null)
{
bool ignored = false;
SafeFileHandle handle = fileStream.SafeFileHandle;
handle.DangerousAddRef(ref ignored);
_fileStreamHandle = handle;
handlePtr = handle.DangerousGetHandle();
}
else
{
handlePtr = IntPtr.MaxValue;
}
SetHandle(handlePtr);
}
