diff --git a/airupfx/airupfx-ace/src/lib.rs b/airupfx/airupfx-ace/src/lib.rs
index 8390139..5e9d77f 100644
--- a/airupfx/airupfx-ace/src/lib.rs
+++ b/airupfx/airupfx-ace/src/lib.rs
@@ -221,26 +221,6 @@ impl Child {
             },
         }
     }
-
-    #[inline]
-    pub fn stdout(&self) -> Option<Arc<airupfx_io::LinePiper>> {
-        match self {
-            Self::Async(child) => child.stdout(),
-            Self::AlwaysSuccess(child) => child.stdout(),
-            Self::Process(proc) => proc.stdout(),
-            Self::Builtin(_) => None,
-        }
-    }
-
-    #[inline]
-    pub fn stderr(&self) -> Option<Arc<airupfx_io::LinePiper>> {
-        match self {
-            Self::Async(child) => child.stderr(),
-            Self::AlwaysSuccess(child) => child.stderr(),
-            Self::Process(proc) => proc.stderr(),
-            Self::Builtin(_) => None,
-        }
-    }
 }
 impl From<airupfx_process::Child> for Child {
     fn from(value: airupfx_process::Child) -> Self {
diff --git a/airupfx/airupfx-io/src/line_piper.rs b/airupfx/airupfx-io/src/line_piper.rs
index 2db5ea8..66d432b 100644
--- a/airupfx/airupfx-io/src/line_piper.rs
+++ b/airupfx/airupfx-io/src/line_piper.rs
@@ -1,6 +1,6 @@
 use std::{future::Future, pin::Pin};
 use tokio::{
-    io::{AsyncBufReadExt, AsyncRead, AsyncReadExt, BufReader},
+    io::{AsyncRead, AsyncReadExt},
     sync::mpsc,
     task::JoinHandle,
 };
@@ -18,20 +18,7 @@ pub struct LinePiper {
 impl LinePiper {
     pub fn new(reader: impl AsyncRead + Unpin + Send + 'static) -> Self {
         let (tx, rx) = mpsc::channel(4);
-        let join_handle = LinePiperEntity::new(reader, tx).start();
-        Self {
-            rx: rx.into(),
-            join_handle,
-        }
-    }
-
-    pub fn with_callback(
-        reader: impl AsyncRead + Unpin + Send + 'static,
-        callback: Box<dyn Callback>,
-    ) -> Self {
-        let (tx, rx) = mpsc::channel(4);
-        let join_handle: JoinHandle<()> =
-            LinePiperEntity::with_callback(reader, tx, callback).start();
+        let join_handle = LinePiperEntity::new(reader, Box::new(ChannelCallback::new(tx))).start();
         Self {
             rx: rx.into(),
             join_handle,
@@ -48,26 +35,17 @@ impl Drop for LinePiper {
     }
 }
 
+pub fn set_callback(reader: impl AsyncRead + Unpin + Send + 'static, callback: Box<dyn Callback>) {
+    LinePiperEntity::new(reader, callback).start();
+}
+
 struct LinePiperEntity<R> {
     reader: R,
-    tx: mpsc::Sender<Vec<u8>>,
-    callback: Option<Box<dyn Callback>>,
+    callback: Box<dyn Callback>,
 }
 impl<R: AsyncRead + Unpin + Send + 'static> LinePiperEntity<R> {
-    fn new(reader: R, tx: mpsc::Sender<Vec<u8>>) -> Self {
-        Self {
-            reader,
-            tx,
-            callback: None,
-        }
-    }
-
-    fn with_callback(reader: R, tx: mpsc::Sender<Vec<u8>>, callback: Box<dyn Callback>) -> Self {
-        Self {
-            reader,
-            tx,
-            callback: Some(callback),
-        }
+    fn new(reader: R, callback: Box<dyn Callback>) -> Self {
+        Self { reader, callback }
     }
 
     fn start(self) -> JoinHandle<()> {
@@ -76,21 +54,44 @@ impl<R: AsyncRead + Unpin + Send + 'static> LinePiperEntity<R> {
         })
     }
 
-    async fn run(self) -> Option<()> {
-        let mut buf = Vec::new();
-        let mut buf_reader = BufReader::new(self.reader);
+    async fn run(mut self) -> Option<()> {
+        let mut buf = Box::new([0u8; 4096]);
+        let mut position = 0;
         loop {
-            let mut limited = (&mut buf_reader).take(1024 * 4);
-            limited.read_until(b'\n', &mut buf).await.ok()?;
-            match &self.callback {
-                Some(callback) => {
-                    callback.invoke(&buf).await;
+            let pos = loop {
+                let count = self.reader.read(&mut buf[position..]).await.ok()?;
+                position += count;
+                if let Some(pos) = &buf[..position].iter().position(|x| b"\n\r\0".contains(x)) {
+                    break *pos;
                 }
-                None => {
-                    self.tx.send(buf.clone()).await.ok()?;
+                assert!(position <= 4096);
+                if position == 4096 {
+                    break 4096;
                 }
-            }
-            buf.clear();
+            };
+            self.callback.invoke(&buf[..pos]).await;
+            position = 0;
         }
     }
 }
+
+#[derive(Clone)]
+struct ChannelCallback {
+    tx: mpsc::Sender<Vec<u8>>,
+}
+impl ChannelCallback {
+    fn new(tx: mpsc::Sender<Vec<u8>>) -> Self {
+        Self { tx }
+    }
+}
+impl Callback for ChannelCallback {
+    fn clone_boxed(&self) -> Box<dyn Callback> {
+        Box::new(self.clone())
+    }
+
+    fn invoke<'a>(&'a self, a: &'a [u8]) -> Pin<Box<dyn Future<Output = ()> + Send + 'a>> {
+        Box::pin(async {
+            self.tx.send(a.to_vec()).await.ok();
+        })
+    }
+}
diff --git a/airupfx/airupfx-process/src/lib.rs b/airupfx/airupfx-process/src/lib.rs
index e749250..b157785 100644
--- a/airupfx/airupfx-process/src/lib.rs
+++ b/airupfx/airupfx-process/src/lib.rs
@@ -9,13 +9,12 @@ cfg_if::cfg_if! {
     }
 }
 
-use airupfx_io::line_piper::{Callback as LinePiperCallback, LinePiper};
+use airupfx_io::line_piper::Callback as LinePiperCallback;
 use std::{
     convert::Infallible,
     ffi::OsString,
     ops::{Deref, DerefMut},
     path::PathBuf,
-    sync::Arc,
 };
 
 /// Returns `true` if supervising `forking` services are supported on the system.
@@ -136,16 +135,6 @@ impl Child {
     pub fn kill(&self) -> std::io::Result<()> {
         self.0.kill()
     }
-
-    /// Returns a reference to the `stdout` piper handle of the child process.
-    pub fn stdout(&self) -> Option<Arc<LinePiper>> {
-        self.0.stdout()
-    }
-
-    /// Returns a reference to the `stderr` piper handle of the child process.
-    pub fn stderr(&self) -> Option<Arc<LinePiper>> {
-        self.0.stderr()
-    }
 }
 impl From<sys::Child> for Child {
     fn from(inner: sys::Child) -> Self {
@@ -159,9 +148,6 @@ pub enum Stdio {
     #[default]
     Inherit,
 
-    /// A new pipe should be arranged to connect the parent and child processes.
-    Piped,
-
     /// Similar to [`Stdio::Piped`], but a callback is called on each line.
     Callback(Box<dyn LinePiperCallback>),
 
@@ -172,7 +158,6 @@ impl Clone for Stdio {
     fn clone(&self) -> Self {
         match self {
             Self::Inherit => Self::Inherit,
-            Self::Piped => Self::Piped,
             Self::Callback(c) => Self::Callback(c.clone_boxed()),
             Self::File(f) => Self::File(f.clone()),
         }
@@ -182,7 +167,6 @@ impl Stdio {
     pub async fn to_std(&self) -> std::io::Result<std::process::Stdio> {
         Ok(match self {
             Self::Inherit => std::process::Stdio::inherit(),
-            Self::Piped => std::process::Stdio::piped(),
             Self::Callback(_) => std::process::Stdio::piped(),
             Self::File(path) => tokio::fs::File::options()
                 .append(true)
diff --git a/airupfx/airupfx-process/src/unix.rs b/airupfx/airupfx-process/src/unix.rs
index 274ed34..fe1de16 100644
--- a/airupfx/airupfx-process/src/unix.rs
+++ b/airupfx/airupfx-process/src/unix.rs
@@ -9,12 +9,12 @@
 
 use super::{CommandEnv, ExitStatus, Stdio, Wait};
 use ahash::AHashMap;
-use airupfx_io::LinePiper;
+use airupfx_io::line_piper;
 use std::{
     cmp,
     convert::Infallible,
     os::unix::process::CommandExt as _,
-    sync::{Arc, OnceLock, RwLock},
+    sync::{OnceLock, RwLock},
 };
 use tokio::{signal::unix::SignalKind, sync::watch};
 
@@ -111,9 +111,8 @@ impl ExitStatusExt for ExitStatus {
 macro_rules! map_stdio {
     ($fx:expr, $std:expr) => {
         match &$fx {
-            Stdio::Piped => LinePiper::new($std),
-            Stdio::Callback(c) => LinePiper::with_callback($std, c.clone_boxed()),
-            _ => LinePiper::new($std),
+            Stdio::Callback(c) => line_piper::set_callback($std, c.clone_boxed()),
+            _ => (),
         }
     };
 }
@@ -123,8 +122,6 @@ macro_rules! map_stdio {
 pub(crate) struct Child {
     pid: Pid,
     wait_queue: watch::Receiver<Option<Wait>>,
-    stdout: Option<Arc<LinePiper>>,
-    stderr: Option<Arc<LinePiper>>,
 }
 impl Child {
     pub(crate) const fn id(&self) -> Pid {
@@ -133,21 +130,21 @@ impl Child {
 
     fn from_std(env: &CommandEnv, c: std::process::Child) -> Self {
         let pid = c.id();
-        let stdout = c
+        if let Some(x) = c
             .stdout
             .and_then(|x| tokio::process::ChildStdout::from_std(x).ok())
-            .map(|x| map_stdio!(env.stdout, x))
-            .map(Arc::new);
-        let stderr = c
+        {
+            map_stdio!(env.stdout, x);
+        }
+        if let Some(x) = c
             .stderr
             .and_then(|x| tokio::process::ChildStderr::from_std(x).ok())
-            .map(|x| map_stdio!(env.stderr, x))
-            .map(Arc::new);
+        {
+            map_stdio!(env.stderr, x);
+        }
         Self {
             pid: pid as _,
             wait_queue: child_queue().subscribe(pid as _),
-            stdout,
-            stderr,
         }
     }
 
@@ -159,8 +156,6 @@ impl Child {
         Self {
             pid,
             wait_queue: child_queue().subscribe(pid),
-            stdout: None,
-            stderr: None,
         }
     }
 
@@ -189,13 +184,13 @@ impl Child {
         self.send_signal(libc::SIGKILL)
     }
 
-    pub(crate) fn stdout(&self) -> Option<Arc<LinePiper>> {
+    /*pub(crate) fn stdout(&self) -> Option<Arc<LinePiper>> {
         self.stdout.clone()
     }
 
     pub(crate) fn stderr(&self) -> Option<Arc<LinePiper>> {
         self.stderr.clone()
-    }
+    }*/
 }
 impl Drop for Child {
     fn drop(&mut self) {