net: implement UCred for espidf (#5868)

tokio/src/net/unix/ucred.rs

@@ -54,6 +54,9 @@ pub(crate) use self::impl_solaris::get_peer_cred;
 #[cfg(target_os = "aix")]
 pub(crate) use self::impl_aix::get_peer_cred;
 
+#[cfg(target_os = "espidf")]
+pub(crate) use self::impl_noproc::get_peer_cred;
+
 #[cfg(any(
     target_os = "linux",
     target_os = "redox",
@@ -291,3 +294,17 @@ pub(crate) mod impl_aix {
         }
     }
 }
+
+#[cfg(target_os = "espidf")]
+pub(crate) mod impl_noproc {
+    use crate::net::unix::UnixStream;
+    use std::io;
+
+    pub(crate) fn get_peer_cred(_sock: &UnixStream) -> io::Result<super::UCred> {
+        Ok(super::UCred {
+            uid: 0,
+            gid: 0,
+            pid: None,
+        })
+    }
+}