Try enabling LocalPeerPid for ios

Author: mitsuhiko

src/sys/socket/sockopt.rs

@@ -492,7 +492,7 @@ sockopt_impl!(
     libc::LOCAL_PEERCRED,
     super::XuCred
 );
-#[cfg(any(target_os = "macos"))]
+#[cfg(any(target_os = "macos", target_os = "ios"))]
 sockopt_impl!(
     /// Get the PID of the peer process of a connected unix domain socket.
     LocalPeerPid,

test/sys/test_sockopt.rs

@@ -54,7 +54,7 @@ pub fn test_local_peercred_stream() {
     assert_eq!(Gid::from_raw(xucred.groups()[0]), Gid::current());
 }
 
-#[cfg(target_os = "macos")]
+#[cfg(any(target_os = "ios", target_os = "macos"))]
 #[test]
 pub fn test_local_peer_pid() {
     use nix::sys::socket::socketpair;