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implement socket splicing on OpenBSD socket splicing allows to do zero-copy data transfers between sockets. This adds a specific implementation for OpenBSD using the setsockopt SO_SPLICE and a default implementation with libevent (that is the old code doing the copy in userland.) It's possible to do the same on linux with splice(2), not implementd though.
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 1 cfe57149 2022-07-30 op /*

 2 cfe57149 2022-07-30 op  * Copyright (c) 2022 Omar Polo <op@omarpolo.com>

 3 cfe57149 2022-07-30 op  *

 4 cfe57149 2022-07-30 op  * Permission to use, copy, modify, and distribute this software for any

 5 cfe57149 2022-07-30 op  * purpose with or without fee is hereby granted, provided that the above

 6 cfe57149 2022-07-30 op  * copyright notice and this permission notice appear in all copies.

 7 cfe57149 2022-07-30 op  *

 8 cfe57149 2022-07-30 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 9 cfe57149 2022-07-30 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

10 cfe57149 2022-07-30 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

11 cfe57149 2022-07-30 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

12 cfe57149 2022-07-30 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

13 cfe57149 2022-07-30 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

14 cfe57149 2022-07-30 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

15 cfe57149 2022-07-30 op  */

16 cfe57149 2022-07-30 op 

17 cfe57149 2022-07-30 op struct conn {

18 cfe57149 2022-07-30 op 	int			 ntentative;

19 cfe57149 2022-07-30 op 	struct timeval		 retry;

20 cfe57149 2022-07-30 op 	struct event		 waitev;

21 cfe57149 2022-07-30 op 	int			 source;

22 cfe57149 2022-07-30 op 	struct bufferevent	*sourcebev;

23 cfe57149 2022-07-30 op 	int			 to;

24 cfe57149 2022-07-30 op 	struct bufferevent	*tobev;

25 cfe57149 2022-07-30 op };

26 cfe57149 2022-07-30 op 

27 cfe57149 2022-07-30 op int		conn_splice(struct conn *);

28 cfe57149 2022-07-30 op void		conn_free(struct conn *);