+/**
+ * Setup a writer node with the default writer.
+ *
+ * If arg is \p NULL, the OS-dependent default writer is used with an empty
+ * configuration string. It defaults to alsa for Linux, osx for OS X, oss for
+ * *BSD and the file writer if neither of these is supported.
+ *
+ * Once the writer configuration has been retrieved, a writer node is created,
+ * its buffer tree node is added to the buffer tree as a child of the given
+ * parent.
+ *
+ * Finally, the new writer node's taks structure is initialized and registered
+ * to the paraslash scheduler.
+ *
+ * \return A pointer to the allocated writer node group.
+ */
+struct writer_node *setup_writer_node(const char *arg, struct btr_node *parent)
+{
+ struct writer_node *wn = para_calloc(sizeof(*wn));
+ struct writer *w;
+ char *name;
+
+ if (arg)
+ wn->conf = check_writer_arg(arg, &wn->writer_num);
+ else {
+ wn->writer_num = DEFAULT_WRITER;
+ wn->conf = writers[DEFAULT_WRITER].parse_config("");
+ }
+ if (!wn->conf) {
+ free(wn);
+ return NULL;
+ }
+ w = writers + wn->writer_num;
+ name = make_message("%s writer", writer_names[wn->writer_num]);
+ wn->btrn = btr_new_node(name, parent, w->execute, wn);
+ strcpy(wn->task.status, name);
+ free(name);
+ w->open(wn);
+ wn->task.post_select = w->post_select_btr;
+ wn->task.pre_select = w->pre_select_btr;
+ register_task(&wn->task);
+ return wn;
+}
+
+
+/**
+ * Print the help text of all writers to stdout.
+ *
+ * \param detailed Whether to print the detailed help text.
+ */