socket: add AF_UNSPEC to AddressFamily

Signed-off-by: Levente Kurusa <lkurusa@acm.org>
nix-rust · Oct 15, 2018 · 632a600 · 632a600
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -19,6 +19,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - Added `futimens` and `utimesat` wrappers ([#944](https://github.com/nix-rust/nix/pull/944))
   and a `utimes` wrapper ([#946](https://github.com/nix-rust/nix/pull/946)).
 - Added a `acct` wrapper module for enabling and disabling process accounting ([#952](https://github.com/nix-rust/nix/pull/952))
+- Added `AF_UNSPEC` wrapper to `AddressFamily` ([#948](https://github.com/nix-rust/nix/pull/948))
 
 ### Changed
 - Increased required Rust version to 1.22.1/

diff --git a/src/sys/socket/addr.rs b/src/sys/socket/addr.rs
@@ -209,6 +209,9 @@ pub enum AddressFamily {
               target_os = "netbsd",
               target_os = "openbsd"))]
     Natm = libc::AF_NATM,
+    /// Unspecified address family, (see [`getaddrinfo(3)`](http://man7.org/linux/man-pages/man3/getaddrinfo.3.html))
+    #[cfg(any(target_os = "android", target_os = "linux"))]
+    Unspec = libc::AF_UNSPEC,
 }
 
 impl AddressFamily {