❯ git show f989f42 
commit f989f421ad2d56a869e5bebca0219d179e3ecf0c (HEAD -> madsim, xxchan/madsim)
Merge: 4538cd6b c5ff8cfd
Author: xxchan <xxchan22f@gmail.com>
Date:   Sun Sep 10 00:08:13 2023 +0800

    Merge branch 'master' into madsim

diff --cc tokio-postgres/Cargo.toml
index e6c7b4f7,ec5e3cbe..fefaddd0
--- a/tokio-postgres/Cargo.toml
+++ b/tokio-postgres/Cargo.toml
@@@ -53,17 -54,21 +54,21 @@@ parking_lot = "0.12
  percent-encoding = "2.0"
  pin-project-lite = "0.2"
  phf = "0.11"
- postgres-protocol = { version = "0.6.4" }
- postgres-types = { version = "0.2.4" }
- socket2 = { version = "0.5", features = ["all"] }
 -postgres-protocol = { version = "0.6.6", path = "../postgres-protocol" }
 -postgres-types = { version = "0.2.5", path = "../postgres-types" }
 -tokio = { version = "1.27", features = ["io-util"] }
++postgres-protocol = { version = "0.6.6" }
++postgres-types = { version = "0.2.5" }
 +tokio = { version = "0.2.2", package = "madsim-tokio", features = ["io-util"] }
  tokio-util = { version = "0.7", features = ["codec"] }
+ rand = "0.8.5"
+ whoami = "1.4.1"
+ 
+ [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+ socket2 = { version = "0.5", features = ["all"] }
  
  [dev-dependencies]
  futures-executor = "0.3"
- criterion = "0.4"
+ criterion = "0.5"
  env_logger = "0.10"
 -tokio = { version = "1.0", features = [
 +tokio = { version = "0.2", package = "madsim-tokio", features = [
      "macros",
      "net",
      "rt",
diff --cc tokio-postgres/src/connect_socket.rs
index ae2359e7,f2713117..02dab3bd
--- a/tokio-postgres/src/connect_socket.rs
+++ b/tokio-postgres/src/connect_socket.rs
@@@ -10,63 -11,40 +11,43 @@@ use tokio::net::UnixStream
  use tokio::time;
  
  pub(crate) async fn connect_socket(
-     host: &Host,
+     addr: &Addr,
      port: u16,
      connect_timeout: Option<Duration>,
-     tcp_user_timeout: Option<Duration>,
+     #[cfg_attr(not(target_os = "linux"), allow(unused_variables))] tcp_user_timeout: Option<
+         Duration,
+     >,
      keepalive_config: Option<&KeepaliveConfig>,
  ) -> Result<Socket, Error> {
-     match host {
-         Host::Tcp(host) => {
-             let addrs = net::lookup_host((&**host, port))
-                 .await
-                 .map_err(Error::connect)?;
+     match addr {
+         Addr::Tcp(ip) => {
+             let stream =
+                 connect_with_timeout(TcpStream::connect((*ip, port)), connect_timeout).await?;
  
-             let mut last_err = None;
+             stream.set_nodelay(true).map_err(Error::connect)?;
  
-             for addr in addrs {
-                 let stream =
-                     match connect_with_timeout(TcpStream::connect(addr), connect_timeout).await {
-                         Ok(stream) => stream,
-                         Err(e) => {
-                             last_err = Some(e);
-                             continue;
-                         }
-                     };
- 
-                 stream.set_nodelay(true).map_err(Error::connect)?;
- 
-                 #[cfg(not(madsim))]
-                 let sock_ref = SockRef::from(&stream);
-                 #[cfg(target_os = "linux")]
-                 #[cfg(not(madsim))]
-                 {
-                     sock_ref
-                         .set_tcp_user_timeout(tcp_user_timeout)
-                         .map_err(Error::connect)?;
-                 }
- 
-                 #[cfg(not(madsim))]
-                 if let Some(keepalive_config) = keepalive_config {
-                     sock_ref
-                         .set_tcp_keepalive(&TcpKeepalive::from(keepalive_config))
-                         .map_err(Error::connect)?;
-                 }
++            #[cfg(not(madsim))]
+             let sock_ref = SockRef::from(&stream);
+             #[cfg(target_os = "linux")]
++            #[cfg(not(madsim))]
+             {
+                 sock_ref
+                     .set_tcp_user_timeout(tcp_user_timeout)
+                     .map_err(Error::connect)?;
+             }
  
-                 return Ok(Socket::new_tcp(stream));
++            #[cfg(not(madsim))]
+             if let Some(keepalive_config) = keepalive_config {
+                 sock_ref
+                     .set_tcp_keepalive(&TcpKeepalive::from(keepalive_config))
+                     .map_err(Error::connect)?;
              }
  
-             Err(last_err.unwrap_or_else(|| {
-                 Error::connect(io::Error::new(
-                     io::ErrorKind::InvalidInput,
-                     "could not resolve any addresses",
-                 ))
-             }))
+             Ok(Socket::new_tcp(stream))
          }
          #[cfg(unix)]
-         Host::Unix(path) => {
-             let path = path.join(format!(".s.PGSQL.{}", port));
+         Addr::Unix(dir) => {
+             let path = dir.join(format!(".s.PGSQL.{}", port));
              let socket = connect_with_timeout(UnixStream::connect(path), connect_timeout).await?;
              Ok(Socket::new_unix(socket))
          }