Update std doctests for android

This updates some doctests that fail to run on android. We will soon be
supporting cross-compiled doctests, and the `arm-android` job fails to
run these tests.

In summary:
- Android re-exports some traits from linux under a different path.
- Android doesn't seem to have common unix utilities like `true`,
  `false`, or `whoami`, so these are disabled.

3 files changed, 15 insertions, 0 deletions

diff --git a/library/std/src/os/net/linux_ext/addr.rs b/library/std/src/os/net/linux_ext/addr.rs
index aed772056e1..41009c0e284 100644
--- a/library/std/src/os/net/linux_ext/addr.rs
+++ b/library/std/src/os/net/linux_ext/addr.rs
@@ -23,7 +23,10 @@ pub trait SocketAddrExt: Sealed {
     ///
     /// ```no_run
     /// use std::os::unix::net::{UnixListener, SocketAddr};
+    /// #[cfg(target_os = "linux")]
     /// use std::os::linux::net::SocketAddrExt;
+    /// #[cfg(target_os = "android")]
+    /// use std::os::android::net::SocketAddrExt;
     ///
     /// fn main() -> std::io::Result<()> {
     ///     let addr = SocketAddr::from_abstract_name(b"hidden")?;
@@ -48,7 +51,10 @@ pub trait SocketAddrExt: Sealed {
     ///
     /// ```no_run
     /// use std::os::unix::net::{UnixListener, SocketAddr};
+    /// #[cfg(target_os = "linux")]
     /// use std::os::linux::net::SocketAddrExt;
+    /// #[cfg(target_os = "android")]
+    /// use std::os::android::net::SocketAddrExt;
     ///
     /// fn main() -> std::io::Result<()> {
     ///     let name = b"hidden";
diff --git a/library/std/src/os/net/linux_ext/socket.rs b/library/std/src/os/net/linux_ext/socket.rs
index 4e4168f693c..a15feb6bd9f 100644
--- a/library/std/src/os/net/linux_ext/socket.rs
+++ b/library/std/src/os/net/linux_ext/socket.rs
@@ -27,7 +27,10 @@ pub trait UnixSocketExt: Sealed {
     ///
     /// ```no_run
     /// #![feature(unix_socket_ancillary_data)]
+    /// #[cfg(target_os = "linux")]
     /// use std::os::linux::net::UnixSocketExt;
+    /// #[cfg(target_os = "android")]
+    /// use std::os::android::net::UnixSocketExt;
     /// use std::os::unix::net::UnixDatagram;
     ///
     /// fn main() -> std::io::Result<()> {
diff --git a/library/std/src/os/net/linux_ext/tcp.rs b/library/std/src/os/net/linux_ext/tcp.rs
index c8d012962d4..95dffb3bc43 100644
--- a/library/std/src/os/net/linux_ext/tcp.rs
+++ b/library/std/src/os/net/linux_ext/tcp.rs
@@ -25,7 +25,10 @@ pub trait TcpStreamExt: Sealed {
     /// ```no_run
     /// #![feature(tcp_quickack)]
     /// use std::net::TcpStream;
+    /// #[cfg(target_os = "linux")]
     /// use std::os::linux::net::TcpStreamExt;
+    /// #[cfg(target_os = "android")]
+    /// use std::os::android::net::TcpStreamExt;
     ///
     /// let stream = TcpStream::connect("127.0.0.1:8080")
     ///         .expect("Couldn't connect to the server...");
@@ -43,7 +46,10 @@ pub trait TcpStreamExt: Sealed {
     /// ```no_run
     /// #![feature(tcp_quickack)]
     /// use std::net::TcpStream;
+    /// #[cfg(target_os = "linux")]
     /// use std::os::linux::net::TcpStreamExt;
+    /// #[cfg(target_os = "android")]
+    /// use std::os::android::net::TcpStreamExt;
     ///
     /// let stream = TcpStream::connect("127.0.0.1:8080")
     ///         .expect("Couldn't connect to the server...");