283 /* Free all trailing chains in 'buf' that are neither pinned nor empty, prior
810  * read-pinned chains. The first pinned chain is saved in first, and the
811  * last in last. If src has no read-pinned chains, first and last are set
817 	struct evbuffer_chain *chain, **pinned;  in PRESERVE_PINNED()  local
826 	pinned = src->last_with_datap;  in PRESERVE_PINNED()
827 	if (!CHAIN_PINNED_R(*pinned))  in PRESERVE_PINNED()
828 		pinned = &(*pinned)->next;  in PRESERVE_PINNED()
829 	EVUTIL_ASSERT(CHAIN_PINNED_R(*pinned));  in PRESERVE_PINNED()
830 	chain = *first = *pinned;  in PRESERVE_PINNED()
833 	/* If there's data in the first pinned chain, we need to allocate  in PRESERVE_PINNED()
838 		EVUTIL_ASSERT(pinned == src->last_with_datap);  in PRESERVE_PINNED()
851 		*pinned = NULL;  in PRESERVE_PINNED()
858 RESTORE_PINNED(struct evbuffer *src, struct evbuffer_chain *pinned,  in RESTORE_PINNED()  argument
863 	if (!pinned) {  in RESTORE_PINNED()
868 	src->first = pinned;  in RESTORE_PINNED()
968 	struct evbuffer_chain *pinned, *last;  in evbuffer_add_buffer()  local
984 	if (PRESERVE_PINNED(inbuf, &pinned, &last) < 0) {  in evbuffer_add_buffer()
998 	RESTORE_PINNED(inbuf, pinned, last);  in evbuffer_add_buffer()
1057 	struct evbuffer_chain *pinned, *last;  in evbuffer_prepend_buffer()  local
1074 	if (PRESERVE_PINNED(inbuf, &pinned, &last) < 0) {  in evbuffer_prepend_buffer()
1088 	RESTORE_PINNED(inbuf, pinned, last);  in evbuffer_prepend_buffer()
1377 	/* Make sure that none of the chains we need to copy from is pinned. */  in evbuffer_pullup()