/// <summary>
/// Initialize PipeFS
/// </summary>
/// <param name="nodes">The nodes array for read and write end</param>
/// <param name="size">The size of the Fifo</param>
public static unsafe ErrorCode Create(Node[] nodes, int size)
{
// Two sided pipe
Node readEnd = new Node();
Node writeEnd = new Node();
Fifo fifo = new Fifo(size, true);
PipeFSCookie cookie = new PipeFSCookie();
cookie.Fifo = fifo;
// Configure
readEnd.Cookie = cookie;
readEnd.GetSize = getSizeImpl;
readEnd.Read = readImpl;
readEnd.Close = closeImpl;
writeEnd.Cookie = cookie;
writeEnd.GetSize = getSizeImpl;
writeEnd.Write = writeImpl;
writeEnd.Close = closeImpl;
// Should be already opened before entering the program again
VFS.Open(readEnd, (int)FileMode.O_RDONLY);
VFS.Open(writeEnd, (int)FileMode.O_WRONLY);
// 0 is read end, 1 is write end
nodes[0] = readEnd;
nodes[1] = writeEnd;
return(ErrorCode.SUCCESS);
}
/// <summary>
/// Read
/// </summary>
/// <param name="node">The node</param>
/// <param name="offset">The offset</param>
/// <param name="size">The size</param>
/// <param name="buffer">The buffer</param>
/// <returns>The amount of bytes written</returns>
private static unsafe uint readImpl(Node node, uint offset, uint size, byte[] buffer)
{
PipeFSCookie cookie = (PipeFSCookie)node.Cookie;
if (cookie == null)
{
return(0);
}
return(cookie.Fifo.Read(buffer, size, 0));
}
/// <summary>
/// Write
/// </summary>
/// <param name="node">The node</param>
/// <param name="offset">The offset</param>
/// <param name="size">The size</param>
/// <param name="buffer">The buffer</param>
/// <returns>The amount of bytes written</returns>
private static unsafe uint writeImpl(Node node, uint offset, uint size, byte[] buffer)
{
PipeFSCookie cookie = (PipeFSCookie)node.Cookie;
if (cookie == null)
{
return(0);
}
return(cookie.Fifo.Write((byte *)Util.ObjectToVoidPtr(buffer), size));
}
/// <summary>
/// Gets the size of a pipe
/// </summary>
/// <param name="node">The pipe node</param>
/// <returns>The size</returns>
private static uint getSizeImpl(Node node)
{
PipeFSCookie cookie = (PipeFSCookie)node.Cookie;
if (cookie == null)
{
return(0);
}
Fifo fifo = cookie.Fifo;
return(fifo.AvailableBytes);
}
/// <summary>
/// Closes the node
/// </summary>
/// <param name="node">The node</param>
private static void closeImpl(Node node)
{
PipeFSCookie cookie = (PipeFSCookie)node.Cookie;
node.Cookie = null;
// Last reference gone?
cookie.ReferenceCount--;
if (cookie.ReferenceCount == 0)
{
cookie.Fifo.Dispose();
Heap.Free(cookie.Fifo);
Heap.Free(cookie);
}
}
