Auto merge of #3098 - folkertdev:freebsd-timestamp-constants, r=JohnTitor

add SO_TS_* constants for FreeBSD

These constants are used in timestamping of packets on a socket. The definitions come from https://github.com/bminor/newlib/blob/master/newlib/libc/sys/rtems/include/sys/socket.h#L165.

For context, here is an example of some of these being used on FreeBSD for packet timestamping in NTP: https://github.com/ntpsec/ntpsec/blob/master/ntpd/ntp_packetstamp.c.

Author: bors

libc-test/semver/freebsd.txt

@@ -1140,6 +1140,13 @@ SO_REUSEPORT
 SO_REUSEPORT_LB
 SO_SETFIB
 SO_TIMESTAMP
+SO_TS_CLOCK
+SO_TS_REALTIME_MICRO
+SO_TS_BINTIME
+SO_TS_REALTIME
+SO_TS_MONOTONIC
+SO_TS_DEFAULT
+SO_TS_CLOCK_MAX
 SO_USELOOPBACK
 SO_USER_COOKIE
 SO_VENDOR

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -2313,9 +2313,17 @@ pub const SO_SETFIB: ::c_int = 0x1014;
 pub const SO_USER_COOKIE: ::c_int = 0x1015;
 pub const SO_PROTOCOL: ::c_int = 0x1016;
 pub const SO_PROTOTYPE: ::c_int = SO_PROTOCOL;
+pub const SO_TS_CLOCK: ::c_int = 0x1017;
 pub const SO_DOMAIN: ::c_int = 0x1019;
 pub const SO_VENDOR: ::c_int = 0x80000000;
 
+pub const SO_TS_REALTIME_MICRO: ::c_int = 0;
+pub const SO_TS_BINTIME: ::c_int = 1;
+pub const SO_TS_REALTIME: ::c_int = 2;
+pub const SO_TS_MONOTONIC: ::c_int = 3;
+pub const SO_TS_DEFAULT: ::c_int = SO_TS_REALTIME_MICRO;
+pub const SO_TS_CLOCK_MAX: ::c_int = SO_TS_MONOTONIC;
+
 pub const LOCAL_CREDS: ::c_int = 2;
 pub const LOCAL_CREDS_PERSISTENT: ::c_int = 3;
 pub const LOCAL_CONNWAIT: ::c_int = 4;