add hw2

node_modules/bare-os/lib/errors.js

@@ -0,0 +1,22 @@
+module.exports = class OSError extends Error {
+  constructor(msg, code, fn = OSError) {
+    super(`${code}: ${msg}`)
+    this.code = code
+
+    if (Error.captureStackTrace) {
+      Error.captureStackTrace(this, fn)
+    }
+  }
+
+  get name() {
+    return 'OSError'
+  }
+
+  static UNKNOWN_SIGNAL(msg) {
+    return new OSError(msg, 'UNKNOWN_SIGNAL', OSError.UNKNOWN_SIGNAL)
+  }
+
+  static TITLE_OVERFLOW(msg) {
+    return new OSError(msg, 'TITLE_OVERFLOW', OSError.TITLE_OVERFLOW)
+  }
+}