evbuffer_add_vprintf 2733 opal/mca/event/libevent2022/libevent/buffer.c 	res = evbuffer_add_vprintf(buf, fmt, ap);
evbuffer_add_vprintf  491 opal/mca/event/libevent2022/libevent/include/event2/buffer.h int evbuffer_add_vprintf(struct evbuffer *buf, const char *fmt, va_list ap)