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