svn commit: r312296 - in head: lib/libc/sys sys/kern sys/netinet sys/netinet6 sys/sys tools/regression/sockets/udp_pingpong tools/regression/sockets/unix_cmsg

[Gleb Smirnoff]

  Hi!

On Mon, Jan 16, 2017 at 05:46:38PM +0000, Maxim Sobolev wrote:
M> Author: sobomax
M> Date: Mon Jan 16 17:46:38 2017
M> New Revision: 312296
M> URL: https://svnweb.freebsd.org/changeset/base/312296
M> 
M> Log:
M>   Add a new socket option SO_TS_CLOCK to pick from several different clock
M>   sources to return timestamps when SO_TIMESTAMP is enabled. Two additional
M>   clock sources are:
M>   
M>   o nanosecond resolution realtime clock (equivalent of CLOCK_REALTIME);
M>   o nanosecond resolution monotonic clock (equivalent of CLOCK_MONOTONIC).
M>   
M>   In addition to this, this option provides unified interface to get bintime
M>   (equivalent of using SO_BINTIME), except it also supported with IPv6 where
M>   SO_BINTIME has never been supported. The long term plan is to depreciate
M>   SO_BINTIME and move everything to using SO_TS_CLOCK.
M>   
M>   Idea for this enhancement has been briefly discussed on the Net session
M>   during dev summit in Ottawa last June and the general input was positive.
M>   
M>   This change is believed to benefit network benchmarks/profiling as well
M>   as other scenarios where precise time of arrival measurement is necessary.
M>   
M>   There are two regression test cases as part of this commit: one extends unix
M>   domain test code (unix_cmsg) to test new SCM_XXX types and another one
M>   implementis totally new test case which exchanges UDP packets between two
M>   processes using both conventional methods (i.e. calling clock_gettime(2)
M>   before recv(2) and after send(2)), as well as using setsockopt()+recv() in
M>   receive path. The resulting delays are checked for sanity for all supported
M>   clock types.
M>   
M>   Reviewed by:    adrian, gnn
M>   Differential Revision:  https://reviews.freebsd.org/D9171

Is it possible to declare possible values as a enum and make so_ts_clock
fields of that enum type?

-- 
Totus tuus, Glebius.