wip: Support Apple tvOS in libstd

library/std/src/os/unix/mod.rs

@@ -73,6 +73,8 @@ mod platform {
     pub use crate::os::redox::*;
     #[cfg(target_os = "solaris")]
     pub use crate::os::solaris::*;
+    #[cfg(target_os = "tvos")]
+    pub use crate::os::tvos::*;
     #[cfg(target_os = "vita")]
     pub use crate::os::vita::*;
     #[cfg(target_os = "vxworks")]
@@ -96,6 +98,7 @@ pub mod thread;
     target_os = "dragonfly",
     target_os = "freebsd",
     target_os = "ios",
+    target_os = "tvos",
     target_os = "watchos",
     target_os = "macos",
     target_os = "netbsd",

library/std/src/os/unix/net/stream.rs

@@ -11,6 +11,7 @@ use crate::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, Owned
     target_os = "dragonfly",
     target_os = "freebsd",
     target_os = "ios",
+    target_os = "tvos",
     target_os = "macos",
     target_os = "watchos",
     target_os = "netbsd",
@@ -30,6 +31,7 @@ use crate::time::Duration;
     target_os = "dragonfly",
     target_os = "freebsd",
     target_os = "ios",
+    target_os = "tvos",
     target_os = "macos",
     target_os = "watchos",
     target_os = "netbsd",
@@ -238,6 +240,7 @@ impl UnixStream {
         target_os = "dragonfly",
         target_os = "freebsd",
         target_os = "ios",
+        target_os = "tvos",
         target_os = "macos",
         target_os = "watchos",
         target_os = "netbsd",

library/std/src/os/unix/ucred.rs

@@ -36,7 +36,7 @@ pub use self::impl_linux::peer_cred;
 ))]
 pub use self::impl_bsd::peer_cred;
 
-#[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))]
+#[cfg(any(target_os = "macos", target_os = "ios", target_os = "tvos", target_os = "watchos"))]
 pub use self::impl_mac::peer_cred;
 
 #[cfg(any(target_os = "linux", target_os = "android"))]
@@ -98,7 +98,7 @@ pub mod impl_bsd {
     }
 }
 
-#[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))]
+#[cfg(any(target_os = "macos", target_os = "ios", target_os = "tvos", target_os = "watchos"))]
 pub mod impl_mac {
     use super::UCred;
     use crate::os::unix::io::AsRawFd;

library/std/src/os/unix/ucred/tests.rs

@@ -8,6 +8,7 @@ use libc::{getegid, geteuid, getpid};
     target_os = "dragonfly",
     target_os = "freebsd",
     target_os = "ios",
+    target_os = "tvos",
     target_os = "macos",
     target_os = "watchos",
     target_os = "openbsd"