IronRuby.Builtins.RubyIO.IsConsoleDescriptor C# (CSharp) Method

        internal static bool IsConsoleDescriptor(int fileDescriptor) {
            return fileDescriptor >= 0 && fileDescriptor < 3;
        }

        private static void Seek(RubyIO /*!*/ self, long pos, int seekOrigin)
        {
            if (seekOrigin < 0 || seekOrigin > 2)
            {
                throw RubyExceptions.CreateArgumentError("Invalid argument");
            }

            if (self.IsConsoleDescriptor())
            {
                throw new Errno.BadFileDescriptorError();
            }

            // TODO: make sure we assert stream is not actually closed
            if (self.Closed)
            {
                throw RubyExceptions.CreateArgumentError("trying to seek on a non-existent stream?");
            }

            SeekOrigin origin = SeekOrigin.Current;

            if (seekOrigin == SEEK_SET)
            {
                origin = SeekOrigin.Begin;
            }
            else if (seekOrigin == SEEK_END)
            {
                origin = SeekOrigin.End;
            }

            self.Seek(pos, origin);
        }