Add support for TCP_KEEPCNT and TCP_KEEPINTVL TCP keepalive options.

Author: yoav-steinberg

CHANGELOG.md

@@ -11,6 +11,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [0.18.0] - 26 July 2020
 ### Added
+- Added `TCP_KEEPCNT` and `TCP_KEEPINTVL` TCP keepalive options.
+  (#[1283](https://github.com/nix-rust/nix/pull/1283))
 - Added `fchown(2)` wrapper.
   (#[1257](https://github.com/nix-rust/nix/pull/1257))
 - Added support on linux systems for `MAP_HUGE_`_`SIZE`_ family of flags.

src/sys/socket/sockopt.rs

@@ -252,6 +252,8 @@ sockopt_impl!(Both, TcpKeepAlive, libc::IPPROTO_TCP, libc::TCP_KEEPALIVE, u32);
           target_os = "linux",
           target_os = "nacl"))]
 sockopt_impl!(Both, TcpKeepIdle, libc::IPPROTO_TCP, libc::TCP_KEEPIDLE, u32);
+sockopt_impl!(Both, TcpKeepCount, libc::IPPROTO_TCP, libc::TCP_KEEPCNT, u32);
+sockopt_impl!(Both, TcpKeepInterval, libc::IPPROTO_TCP, libc::TCP_KEEPINTVL, u32);
 sockopt_impl!(Both, RcvBuf, libc::SOL_SOCKET, libc::SO_RCVBUF, usize);
 sockopt_impl!(Both, SndBuf, libc::SOL_SOCKET, libc::SO_SNDBUF, usize);
 #[cfg(any(target_os = "android", target_os = "linux"))]