evbuffer_drain    959 opal/mca/event/libevent2022/libevent/buffer.c evbuffer_drain(struct evbuffer *buf, size_t len)
evbuffer_drain    115 opal/mca/event/libevent2022/libevent/opal_rename.h #define evbuffer_drain                                        opal_libevent2022_evbuffer_drain