Function createDevice

src/piper.js:3069–3119

(parent, name, input, output)

				return node;
			},
			createDevice(parent, name, input, output) {
				var path = PATH.join2(typeof parent == 'string' ? parent : FS.getPath(parent), name);
				var mode = FS_getMode(!!input, !!output);
				if (!FS.createDevice.major) FS.createDevice.major = 64;
				var dev = FS.makedev(FS.createDevice.major++, 0);
				FS.registerDevice(dev, {
					open(stream) {
						stream.seekable = false;
					},
					close(stream) {
						if (output && output.buffer && output.buffer.length) {
							output(10);
						}
					},
					read(stream, buffer, offset, length, pos) {
						var bytesRead = 0;
						for (var i = 0; i < length; i++) {
							var result;
							try {
								result = input();
							} catch (e) {
								throw new FS.ErrnoError(29);
							}
							if (result === undefined && bytesRead === 0) {
								throw new FS.ErrnoError(6);
							}
							if (result === null || result === undefined) break;
							bytesRead++;
							buffer[offset + i] = result;
						}
						if (bytesRead) {
							stream.node.timestamp = Date.now();
						}
						return bytesRead;
					},
					write(stream, buffer, offset, length, pos) {
						for (var i = 0; i < length; i++) {
							try {
								output(buffer[offset + i]);
							} catch (e) {
								throw new FS.ErrnoError(29);
							}
						}
						if (length) {
							stream.node.timestamp = Date.now();
						}
						return i;
					},
				});
				return FS.mkdev(path, mode, dev);
			},
			forceLoadFile(obj) {
				if (obj.isDevice || obj.isFolder || obj.link || obj.contents) return true;
				if (typeof XMLHttpRequest != 'undefined') {