evbuffer_copyout 1034 opal/mca/event/libevent2022/libevent/buffer.c 	n = evbuffer_copyout(buf, data_out, datlen);
evbuffer_copyout  342 opal/mca/event/libevent2022/libevent/include/event2/buffer.h ev_ssize_t evbuffer_copyout(struct evbuffer *buf, void *data_out, size_t datlen);