- * Pointer to the converting function of the filter. It should convert as
- * input data as possible. On errors, the post_select function is supposed
- * to set t->error to a (negative) error code.
+ * Pointer to the converting function of the filter. On errors, the
+ * post_select function is supposed to return a negative error code.
+ */
+ int (*post_select)(struct sched *s, struct task *t);
+ /**
+ * Answer a buffer tree query.
+ *
+ * This optional function pointer is used for inter node communications
+ * of the buffer tree nodes. See \ref btr_command_handler for details.