+ * Write to writable pipe used to notify a thread.
+ */
+int notify_thread_pipe(int wpipe)
+{
+ int ret;
+
+ ret = write(wpipe, "!", 1);
+ if (ret < 0) {
+ PERROR("write poll pipe");
+ }
+
+ return ret;
+}
+
+/*
+ * Return pointer to home directory path using the env variable HOME.