Refactor unix stream socket implementation

services/libs/jinux-std/src/fs/ramfs/fs.rs

@@ -378,6 +378,19 @@ impl RamInode {
         })
     }
 
+    fn new_socket(fs: &Arc<RamFS>, mode: InodeMode) -> Arc<Self> {
+        Arc::new_cyclic(|weak_self| {
+            let inode = RamInode(RwLock::new(Inode_::new_socket(
+                fs.alloc_id(),
+                mode,
+                &fs.sb(),
+            )));
+            inode.0.write().fs = Arc::downgrade(fs);
+            inode.0.write().this = weak_self.clone();
+            inode
+        })
+    }
+
     fn new_symlink(fs: &Arc<RamFS>, mode: InodeMode) -> Arc<Self> {
         Arc::new_cyclic(|weak_self| {
             let inode = RamInode(RwLock::new(Inode_::new_symlink(
@@ -494,29 +507,12 @@ impl Inode for RamInode {
         let new_inode = match type_ {
             InodeType::File => RamInode::new_file(&fs, mode),
             InodeType::SymLink => RamInode::new_symlink(&fs, mode),
+            InodeType::Socket => RamInode::new_socket(&fs, mode),
             InodeType::Dir => {
                 let dir_inode = RamInode::new_dir(&fs, mode, &self_inode.this);
                 self_inode.metadata.nlinks += 1;
                 dir_inode
             }
-            InodeType::SymLink => {
-                let sym_inode = Arc::new(RamInode(RwLock::new(Inode_::new_symlink(
-                    fs.alloc_id(),
-                    mode,
-                    &fs.sb(),
-                ))));
-                sym_inode.0.write().fs = self_inode.fs.clone();
-                sym_inode
-            }
-            InodeType::Socket => {
-                let socket_inode = Arc::new(RamInode(RwLock::new(Inode_::new_socket(
-                    fs.alloc_id(),
-                    mode,
-                    &fs.sb(),
-                ))));
-                socket_inode.0.write().fs = self_inode.fs.clone();
-                socket_inode
-            }
             _ => {
                 panic!("unsupported inode type");
             }

services/libs/jinux-std/src/net/socket/unix/addr.rs

@@ -1,88 +1,63 @@
-use crate::{
+use crate::fs::utils::Dentry;
-    fs::{
+use crate::net::socket::util::sockaddr::SocketAddr;
-        fs_resolver::{split_path, FsPath},
+use crate::prelude::*;
-        utils::{Dentry, InodeMode, InodeType},
+
-    },
+#[derive(Clone, Debug, PartialEq, Eq)]
-    net::socket::util::sockaddr::SocketAddr,
+pub enum UnixSocketAddr {
-    prelude::*,
+    Path(String),
-};
+    Abstract(String),
+}
 
 #[derive(Clone)]
-pub enum UnixSocketAddr {
+pub(super) enum UnixSocketAddrBound {
-    Bound(Arc<Dentry>),
+    Path(Arc<Dentry>),
-    Unbound(String),
+    Abstract(String),
+}
+
+impl PartialEq for UnixSocketAddrBound {
+    fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (Self::Abstract(l0), Self::Abstract(r0)) => l0 == r0,
+            (Self::Path(l0), Self::Path(r0)) => {
+                let Some(linode) = l0.inode().upgrade() else {
+                    return false;
+                };
+                let Some(rinode) = r0.inode().upgrade() else {
+                    return false;
+                };
+                Arc::ptr_eq(&linode, &rinode)
+            }
+            _ => false,
+        }
+    }
 }
 
 impl TryFrom<SocketAddr> for UnixSocketAddr {
     type Error = Error;
 
     fn try_from(value: SocketAddr) -> Result<Self> {
-        let SocketAddr::Unix(path) = value else {
+        match value {
-            return_errno_with_message!(Errno::EINVAL, "Invalid unix socket addr")
+            SocketAddr::Unix(unix_socket_addr) => Ok(unix_socket_addr),
-        };
+            _ => return_errno_with_message!(Errno::EINVAL, "Invalid unix socket addr"),
-        Ok(Self::Unbound(path))
+        }
     }
 }
 
-impl From<UnixSocketAddr> for SocketAddr {
+impl From<UnixSocketAddrBound> for UnixSocketAddr {
-    fn from(value: UnixSocketAddr) -> Self {
+    fn from(value: UnixSocketAddrBound) -> Self {
-        SocketAddr::Unix(value.path())
+        match value {
-    }
+            UnixSocketAddrBound::Path(dentry) => {
-}
+                let abs_path = dentry.abs_path();
-
+                Self::Path(abs_path)
-impl UnixSocketAddr {
-    pub fn create_file_and_bind(&mut self) -> Result<()> {
-        let Self::Unbound(path) = self else {
-            return_errno_with_message!(Errno::EINVAL, "the addr is already bound");
-        };
-
-        let (parent_pathname, file_name) = split_path(path);
-        let parent = {
-            let current = current!();
-            let fs = current.fs().read();
-            let parent_path = FsPath::try_from(parent_pathname)?;
-            fs.lookup(&parent_path)?
-        };
-        let dentry = parent.create(
-            file_name,
-            InodeType::Socket,
-            InodeMode::S_IRUSR | InodeMode::S_IWUSR,
-        )?;
-        *self = Self::Bound(dentry);
-        Ok(())
-    }
-
-    /// The dentry. If self is bound, return the bound dentry, otherwise lookup dentry in file system.
-    pub fn dentry(&self) -> Result<Arc<Dentry>> {
-        match self {
-            UnixSocketAddr::Bound(dentry) => Ok(dentry.clone()),
-            UnixSocketAddr::Unbound(path) => {
-                let dentry = {
-                    let current = current!();
-                    let fs = current.fs().read();
-                    let fs_path = FsPath::try_from(path.as_str())?;
-                    fs.lookup(&fs_path)?
-                };
-
-                if dentry.inode_type() != InodeType::Socket {
-                    return_errno_with_message!(Errno::EACCES, "not a socket file")
-                }
-
-                if !dentry.inode_mode().is_readable() || !dentry.inode_mode().is_writable() {
-                    return_errno_with_message!(
-                        Errno::EACCES,
-                        "the socket cannot be read or written"
-                    )
-                }
-                return Ok(dentry);
             }
-        }
+            UnixSocketAddrBound::Abstract(name) => Self::Abstract(name),
-    }
-
-    pub fn path(&self) -> String {
-        match self {
-            UnixSocketAddr::Bound(dentry) => dentry.abs_path(),
-            UnixSocketAddr::Unbound(path) => path.clone(),
         }
     }
 }
+
+impl From<UnixSocketAddrBound> for SocketAddr {
+    fn from(value: UnixSocketAddrBound) -> Self {
+        let unix_socket_addr = UnixSocketAddr::from(value);
+        SocketAddr::Unix(unix_socket_addr)
+    }
+}

services/libs/jinux-std/src/net/socket/unix/stream/connected.rs

@@ -1,55 +1,50 @@
-use crate::{
-    net::socket::{unix::addr::UnixSocketAddr, SockShutdownCmd},
-    prelude::*,
-};
-
 use super::endpoint::Endpoint;
+use crate::fs::utils::{IoEvents, Poller};
+use crate::net::socket::{unix::addr::UnixSocketAddrBound, SockShutdownCmd};
+use crate::prelude::*;
 
-pub struct Connected {
+pub(super) struct Connected {
     local_endpoint: Arc<Endpoint>,
-    // The peer addr is None if peer is unnamed.
-    // FIXME: can a socket be bound after the socket is connected?
-    peer_addr: Option<UnixSocketAddr>,
 }
 
 impl Connected {
-    pub fn new(local_endpoint: Arc<Endpoint>) -> Self {
+    pub(super) fn new(local_endpoint: Arc<Endpoint>) -> Self {
-        let peer_addr = local_endpoint.peer_addr();
+        Connected { local_endpoint }
-        Connected {
-            local_endpoint,
-            peer_addr,
-        }
     }
 
-    pub fn addr(&self) -> Option<UnixSocketAddr> {
+    pub(super) fn addr(&self) -> Option<UnixSocketAddrBound> {
         self.local_endpoint.addr()
     }
 
-    pub fn peer_addr(&self) -> Option<&UnixSocketAddr> {
+    pub(super) fn peer_addr(&self) -> Option<UnixSocketAddrBound> {
-        self.peer_addr.as_ref()
+        self.local_endpoint.peer_addr()
     }
 
-    pub fn is_bound(&self) -> bool {
+    pub(super) fn is_bound(&self) -> bool {
         self.addr().is_some()
     }
 
-    pub fn write(&self, buf: &[u8]) -> Result<usize> {
+    pub(super) fn write(&self, buf: &[u8]) -> Result<usize> {
         self.local_endpoint.write(buf)
     }
 
-    pub fn read(&self, buf: &mut [u8]) -> Result<usize> {
+    pub(super) fn read(&self, buf: &mut [u8]) -> Result<usize> {
         self.local_endpoint.read(buf)
     }
 
-    pub fn shutdown(&self, cmd: SockShutdownCmd) -> Result<()> {
+    pub(super) fn shutdown(&self, cmd: SockShutdownCmd) -> Result<()> {
         self.local_endpoint.shutdown(cmd)
     }
 
-    pub fn is_nonblocking(&self) -> bool {
+    pub(super) fn is_nonblocking(&self) -> bool {
         self.local_endpoint.is_nonblocking()
     }
 
-    pub fn set_nonblocking(&self, is_nonblocking: bool) {
+    pub(super) fn set_nonblocking(&self, is_nonblocking: bool) {
         self.local_endpoint.set_nonblocking(is_nonblocking).unwrap();
     }
+
+    pub(super) fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
+        self.local_endpoint.poll(mask, poller)
+    }
 }

services/libs/jinux-std/src/net/socket/unix/stream/endpoint.rs

@@ -1,20 +1,20 @@
 use crate::{
     fs::utils::{Channel, Consumer, IoEvents, Poller, Producer, StatusFlags},
-    net::socket::{unix::addr::UnixSocketAddr, SockShutdownCmd},
+    net::socket::{unix::addr::UnixSocketAddrBound, SockShutdownCmd},
     prelude::*,
 };
 
-pub struct Endpoint(Inner);
+pub(super) struct Endpoint(Inner);
 
 struct Inner {
-    addr: RwLock<Option<UnixSocketAddr>>,
+    addr: RwLock<Option<UnixSocketAddrBound>>,
     reader: Consumer<u8>,
     writer: Producer<u8>,
     peer: Weak<Endpoint>,
 }
 
 impl Endpoint {
-    pub fn end_pair(is_nonblocking: bool) -> Result<(Arc<Endpoint>, Arc<Endpoint>)> {
+    pub(super) fn new_pair(is_nonblocking: bool) -> Result<(Arc<Endpoint>, Arc<Endpoint>)> {
         let flags = if is_nonblocking {
             StatusFlags::O_NONBLOCK
         } else {
@@ -43,26 +43,26 @@ impl Endpoint {
         })
     }
 
-    pub fn addr(&self) -> Option<UnixSocketAddr> {
+    pub(super) fn addr(&self) -> Option<UnixSocketAddrBound> {
         self.0.addr.read().clone()
     }
 
-    pub fn set_addr(&self, addr: UnixSocketAddr) {
+    pub(super) fn set_addr(&self, addr: UnixSocketAddrBound) {
         *self.0.addr.write() = Some(addr);
     }
 
-    pub fn peer_addr(&self) -> Option<UnixSocketAddr> {
+    pub(super) fn peer_addr(&self) -> Option<UnixSocketAddrBound> {
         self.0.peer.upgrade().map(|peer| peer.addr()).flatten()
     }
 
-    pub fn is_nonblocking(&self) -> bool {
+    pub(super) fn is_nonblocking(&self) -> bool {
         let reader_status = self.0.reader.is_nonblocking();
         let writer_status = self.0.writer.is_nonblocking();
         debug_assert!(reader_status == writer_status);
         reader_status
     }
 
-    pub fn set_nonblocking(&self, is_nonblocking: bool) -> Result<()> {
+    pub(super) fn set_nonblocking(&self, is_nonblocking: bool) -> Result<()> {
         let reader_flags = self.0.reader.status_flags();
         self.0
             .reader
@@ -74,15 +74,15 @@ impl Endpoint {
         Ok(())
     }
 
-    pub fn read(&self, buf: &mut [u8]) -> Result<usize> {
+    pub(super) fn read(&self, buf: &mut [u8]) -> Result<usize> {
         self.0.reader.read(buf)
     }
 
-    pub fn write(&self, buf: &[u8]) -> Result<usize> {
+    pub(super) fn write(&self, buf: &[u8]) -> Result<usize> {
         self.0.writer.write(buf)
     }
 
-    pub fn shutdown(&self, cmd: SockShutdownCmd) -> Result<()> {
+    pub(super) fn shutdown(&self, cmd: SockShutdownCmd) -> Result<()> {
         if !self.is_connected() {
             return_errno_with_message!(Errno::ENOTCONN, "The socket is not connected.");
         }
@@ -98,11 +98,11 @@ impl Endpoint {
         Ok(())
     }
 
-    pub fn is_connected(&self) -> bool {
+    pub(super) fn is_connected(&self) -> bool {
         self.0.peer.upgrade().is_some()
     }
 
-    pub fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
+    pub(super) fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
         let mut events = IoEvents::empty();
         // FIXME: should reader and writer use the same mask?
         let reader_events = self.0.reader.poll(mask, poller);

services/libs/jinux-std/src/net/socket/unix/stream/init.rs

@@ -1,50 +1,99 @@
 use core::sync::atomic::{AtomicBool, Ordering};
 
-use crate::fs::utils::{IoEvents, Pollee, Poller};
+use crate::fs::fs_resolver::{split_path, FsPath};
-use crate::net::socket::unix::addr::UnixSocketAddr;
+use crate::fs::utils::{Dentry, InodeMode, InodeType, IoEvents, Pollee, Poller};
+use crate::net::socket::unix::addr::{UnixSocketAddr, UnixSocketAddrBound};
 use crate::prelude::*;
 
-pub struct Init {
+use super::connected::Connected;
+use super::endpoint::Endpoint;
+use super::listener::push_incoming;
+
+pub(super) struct Init {
     is_nonblocking: AtomicBool,
-    bind_addr: Option<UnixSocketAddr>,
+    addr: Mutex<Option<UnixSocketAddrBound>>,
     pollee: Pollee,
 }
 
 impl Init {
-    pub fn new(is_nonblocking: bool) -> Self {
+    pub(super) fn new(is_nonblocking: bool) -> Self {
         Self {
             is_nonblocking: AtomicBool::new(is_nonblocking),
-            bind_addr: None,
+            addr: Mutex::new(None),
             pollee: Pollee::new(IoEvents::empty()),
         }
     }
 
-    pub fn bind(&mut self, mut addr: UnixSocketAddr) -> Result<()> {
+    pub(super) fn bind(&self, addr_to_bind: &UnixSocketAddr) -> Result<()> {
-        if self.bind_addr.is_some() {
+        let mut addr = self.addr.lock();
+        if addr.is_some() {
             return_errno_with_message!(Errno::EINVAL, "the socket is already bound");
         }
-        addr.create_file_and_bind()?;
+
-        self.bind_addr = Some(addr);
+        let bound_addr = match addr_to_bind {
+            UnixSocketAddr::Abstract(_) => todo!(),
+            UnixSocketAddr::Path(path) => {
+                let dentry = create_socket_file(path)?;
+                UnixSocketAddrBound::Path(dentry)
+            }
+        };
+
+        *addr = Some(bound_addr);
         Ok(())
     }
 
-    pub fn is_bound(&self) -> bool {
+    pub(super) fn connect(&self, remote_addr: &UnixSocketAddrBound) -> Result<Connected> {
-        self.bind_addr.is_none()
+        let addr = self.addr();
+
+        if let Some(ref addr) = addr {
+            if *addr == *remote_addr {
+                return_errno_with_message!(Errno::EINVAL, "try to connect to self is invalid");
+            }
+        }
+
+        let (this_end, remote_end) = Endpoint::new_pair(self.is_nonblocking())?;
+        remote_end.set_addr(remote_addr.clone());
+        if let Some(addr) = addr {
+            this_end.set_addr(addr.clone());
+        };
+
+        push_incoming(remote_addr, remote_end)?;
+        Ok(Connected::new(this_end))
     }
 
-    pub fn bound_addr(&self) -> Option<&UnixSocketAddr> {
+    pub(super) fn is_bound(&self) -> bool {
-        self.bind_addr.as_ref()
+        self.addr.lock().is_some()
     }
 
-    pub fn is_nonblocking(&self) -> bool {
+    pub(super) fn addr(&self) -> Option<UnixSocketAddrBound> {
+        self.addr.lock().clone()
+    }
+
+    pub(super) fn is_nonblocking(&self) -> bool {
         self.is_nonblocking.load(Ordering::Acquire)
     }
 
-    pub fn set_nonblocking(&self, is_nonblocking: bool) {
+    pub(super) fn set_nonblocking(&self, is_nonblocking: bool) {
         self.is_nonblocking.store(is_nonblocking, Ordering::Release);
     }
 
-    pub fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
+    pub(super) fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
         self.pollee.poll(mask, poller)
     }
 }
+
+fn create_socket_file(path: &str) -> Result<Arc<Dentry>> {
+    let (parent_pathname, file_name) = split_path(path);
+    let parent = {
+        let current = current!();
+        let fs = current.fs().read();
+        let parent_path = FsPath::try_from(parent_pathname)?;
+        fs.lookup(&parent_path)?
+    };
+    let dentry = parent.create(
+        file_name,
+        InodeType::Socket,
+        InodeMode::S_IRUSR | InodeMode::S_IWUSR,
+    )?;
+    Ok(dentry)
+}

services/libs/jinux-std/src/net/socket/unix/stream/listen.rs

@@ -1,29 +0,0 @@
-use core::sync::atomic::{AtomicBool, Ordering};
-
-use crate::net::socket::unix::addr::UnixSocketAddr;
-
-pub struct Listen {
-    addr: UnixSocketAddr,
-    is_nonblocking: AtomicBool,
-}
-
-impl Listen {
-    pub fn new(addr: UnixSocketAddr, nonblocking: bool) -> Self {
-        Self {
-            addr,
-            is_nonblocking: AtomicBool::new(nonblocking),
-        }
-    }
-
-    pub fn addr(&self) -> &UnixSocketAddr {
-        &self.addr
-    }
-
-    pub fn is_nonblocking(&self) -> bool {
-        self.is_nonblocking.load(Ordering::Acquire)
-    }
-
-    pub fn set_nonblocking(&self, is_nonblocking: bool) {
-        self.is_nonblocking.store(is_nonblocking, Ordering::Release);
-    }
-}

services/libs/jinux-std/src/net/socket/unix/stream/listener.rs

@@ -1,116 +1,171 @@
+use super::{connected::Connected, endpoint::Endpoint, UnixStreamSocket};
+use crate::fs::file_handle::FileLike;
+use crate::fs::utils::{Dentry, Inode, IoEvents, Pollee, Poller};
+use crate::net::socket::unix::addr::{UnixSocketAddr, UnixSocketAddrBound};
+use crate::net::socket::SocketAddr;
+use crate::prelude::*;
+use core::sync::atomic::{AtomicBool, Ordering};
 use keyable_arc::KeyableWeak;
-use spin::RwLockReadGuard;
 
-use crate::{
+pub(super) struct Listener {
-    fs::utils::{Inode, IoEvents, Pollee, Poller},
+    addr: UnixSocketAddrBound,
-    net::socket::unix::addr::UnixSocketAddr,
+    is_nonblocking: AtomicBool,
-    prelude::*,
+}
-};
 
-use super::endpoint::Endpoint;
+impl Listener {
+    pub(super) fn new(
+        addr: UnixSocketAddrBound,
+        backlog: usize,
+        nonblocking: bool,
+    ) -> Result<Self> {
+        BACKLOG_TABLE.add_backlog(&addr, backlog)?;
+        Ok(Self {
+            addr,
+            is_nonblocking: AtomicBool::new(nonblocking),
+        })
+    }
 
-pub static ACTIVE_LISTENERS: ActiveListeners = ActiveListeners::new();
+    pub(super) fn addr(&self) -> &UnixSocketAddrBound {
+        &self.addr
+    }
 
-pub struct ActiveListeners {
+    pub(super) fn is_nonblocking(&self) -> bool {
-    listeners: RwLock<BTreeMap<KeyableWeak<dyn Inode>, Arc<Listener>>>,
+        self.is_nonblocking.load(Ordering::Acquire)
+    }
+
+    pub(super) fn set_nonblocking(&self, is_nonblocking: bool) {
+        self.is_nonblocking.store(is_nonblocking, Ordering::Release);
+    }
+
+    pub(super) fn accept(&self) -> Result<(Arc<dyn FileLike>, SocketAddr)> {
+        let addr = self.addr().clone();
+        let is_nonblocking = self.is_nonblocking();
+
+        let connected = {
+            let local_endpoint = BACKLOG_TABLE.pop_incoming(is_nonblocking, &addr)?;
+            Connected::new(local_endpoint)
+        };
+
+        let peer_addr = match connected.peer_addr() {
+            None => SocketAddr::Unix(UnixSocketAddr::Path(String::new())),
+            Some(addr) => SocketAddr::from(addr.clone()),
+        };
+
+        let socket = Arc::new(UnixStreamSocket::new_connected(connected));
+
+        Ok((socket, peer_addr))
+    }
+
+    pub(super) fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
+        let addr = self.addr();
+        let backlog = BACKLOG_TABLE.get_backlog(addr).unwrap();
+        backlog.poll(mask, poller)
+    }
+}
+
+static BACKLOG_TABLE: BacklogTable = BacklogTable::new();
+
+struct BacklogTable {
+    backlog_sockets: RwLock<BTreeMap<KeyableWeak<dyn Inode>, Arc<Backlog>>>,
     // TODO: For linux, there is also abstract socket domain that a socket addr is not bound to an inode.
 }
 
-impl ActiveListeners {
+impl BacklogTable {
-    pub const fn new() -> Self {
+    const fn new() -> Self {
         Self {
-            listeners: RwLock::new(BTreeMap::new()),
+            backlog_sockets: RwLock::new(BTreeMap::new()),
         }
     }
 
-    pub(super) fn add_listener(&self, addr: &UnixSocketAddr, backlog: usize) -> Result<()> {
+    fn add_backlog(&self, addr: &UnixSocketAddrBound, backlog: usize) -> Result<()> {
-        let inode = create_keyable_inode(addr)?;
+        let inode = {
-        let mut listeners = self.listeners.write();
+            let UnixSocketAddrBound::Path(dentry) = addr else {
-        if listeners.contains_key(&inode) {
+                todo!()
+            };
+            create_keyable_inode(dentry)
+        };
+
+        let mut backlog_sockets = self.backlog_sockets.write();
+        if backlog_sockets.contains_key(&inode) {
             return_errno_with_message!(Errno::EADDRINUSE, "the addr is already used");
         }
-        let new_listener = Arc::new(Listener::new(backlog));
+        let new_backlog = Arc::new(Backlog::new(backlog));
-        listeners.insert(inode, new_listener);
+        backlog_sockets.insert(inode, new_backlog);
         Ok(())
     }
 
-    pub(super) fn get_listener(&self, addr: &UnixSocketAddr) -> Result<Arc<Listener>> {
+    fn get_backlog(&self, addr: &UnixSocketAddrBound) -> Result<Arc<Backlog>> {
-        let listeners = self.listeners.read();
+        let inode = {
-        get_listener(&listeners, addr)
+            let UnixSocketAddrBound::Path(dentry) = addr else {
+                todo!()
+            };
+            create_keyable_inode(dentry)
+        };
+
+        let backlog_sockets = self.backlog_sockets.read();
+        backlog_sockets
+            .get(&inode)
+            .map(Arc::clone)
+            .ok_or_else(|| Error::with_message(Errno::EINVAL, "the socket is not listened"))
     }
 
-    pub(super) fn pop_incoming(
+    fn pop_incoming(&self, nonblocking: bool, addr: &UnixSocketAddrBound) -> Result<Arc<Endpoint>> {
-        &self,
-        nonblocking: bool,
-        addr: &UnixSocketAddr,
-    ) -> Result<Arc<Endpoint>> {
         let poller = Poller::new();
         loop {
-            let listener = {
+            let backlog = self.get_backlog(addr)?;
-                let listeners = self.listeners.read();
+
-                get_listener(&listeners, addr)?
+            if let Some(endpoint) = backlog.pop_incoming() {
-            };
-            if let Some(endpoint) = listener.pop_incoming() {
                 return Ok(endpoint);
             }
+
             if nonblocking {
                 return_errno_with_message!(Errno::EAGAIN, "no connection comes");
             }
+
             let events = {
                 let mask = IoEvents::IN;
-                listener.poll(mask, Some(&poller))
+                backlog.poll(mask, Some(&poller))
             };
+
             if events.contains(IoEvents::ERR) | events.contains(IoEvents::HUP) {
-                return_errno_with_message!(Errno::EINVAL, "connection is refused");
+                return_errno_with_message!(Errno::ECONNABORTED, "connection is aborted");
             }
+
             if events.is_empty() {
                 poller.wait();
             }
         }
     }
 
-    pub(super) fn push_incoming(
+    fn push_incoming(&self, addr: &UnixSocketAddrBound, endpoint: Arc<Endpoint>) -> Result<()> {
-        &self,
+        let backlog = self.get_backlog(addr).map_err(|_| {
-        addr: &UnixSocketAddr,
-        endpoint: Arc<Endpoint>,
-    ) -> Result<()> {
-        let listeners = self.listeners.read();
-        let listener = get_listener(&listeners, addr).map_err(|_| {
             Error::with_message(
                 Errno::ECONNREFUSED,
                 "no socket is listened at the remote address",
             )
         })?;
-        listener.push_incoming(endpoint)
+
+        backlog.push_incoming(endpoint)
     }
 
-    pub(super) fn remove_listener(&self, addr: &UnixSocketAddr) {
+    fn remove_backlog(&self, addr: &UnixSocketAddrBound) {
-        let Ok(inode) = create_keyable_inode(addr) else {
+        let UnixSocketAddrBound::Path(dentry) = addr else {
-            return;
+            todo!()
         };
-        self.listeners.write().remove(&inode);
+
+        let inode = create_keyable_inode(dentry);
+        self.backlog_sockets.write().remove(&inode);
     }
 }
 
-fn get_listener(
+struct Backlog {
-    listeners: &RwLockReadGuard<BTreeMap<KeyableWeak<dyn Inode>, Arc<Listener>>>,
-    addr: &UnixSocketAddr,
-) -> Result<Arc<Listener>> {
-    let dentry = create_keyable_inode(addr)?;
-    listeners
-        .get(&dentry)
-        .map(Arc::clone)
-        .ok_or_else(|| Error::with_message(Errno::EINVAL, "the socket is not listened"))
-}
-
-pub(super) struct Listener {
     pollee: Pollee,
     backlog: usize,
     incoming_endpoints: Mutex<VecDeque<Arc<Endpoint>>>,
 }
 
-impl Listener {
+impl Backlog {
-    pub fn new(backlog: usize) -> Self {
+    fn new(backlog: usize) -> Self {
         Self {
             pollee: Pollee::new(IoEvents::empty()),
             backlog,
@@ -118,7 +173,7 @@ impl Listener {
         }
     }
 
-    pub fn push_incoming(&self, endpoint: Arc<Endpoint>) -> Result<()> {
+    fn push_incoming(&self, endpoint: Arc<Endpoint>) -> Result<()> {
         let mut endpoints = self.incoming_endpoints.lock();
         if endpoints.len() >= self.backlog {
             return_errno_with_message!(Errno::ECONNREFUSED, "incoming_endpoints is full");
@@ -128,24 +183,34 @@ impl Listener {
         Ok(())
     }
 
-    pub fn pop_incoming(&self) -> Option<Arc<Endpoint>> {
+    fn pop_incoming(&self) -> Option<Arc<Endpoint>> {
         let mut incoming_endpoints = self.incoming_endpoints.lock();
         let endpoint = incoming_endpoints.pop_front();
-        if endpoint.is_none() {
+        if incoming_endpoints.is_empty() {
             self.pollee.del_events(IoEvents::IN);
         }
         endpoint
     }
 
-    pub fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
+    fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
         // Lock to avoid any events may change pollee state when we poll
         let _lock = self.incoming_endpoints.lock();
         self.pollee.poll(mask, poller)
     }
 }
 
-fn create_keyable_inode(addr: &UnixSocketAddr) -> Result<KeyableWeak<dyn Inode>> {
+fn create_keyable_inode(dentry: &Arc<Dentry>) -> KeyableWeak<dyn Inode> {
-    let dentry = addr.dentry()?;
     let inode = dentry.inode();
-    Ok(KeyableWeak::from(inode))
+    KeyableWeak::from(inode)
+}
+
+pub(super) fn unregister_backlog(addr: &UnixSocketAddrBound) {
+    BACKLOG_TABLE.remove_backlog(&addr);
+}
+
+pub(super) fn push_incoming(
+    remote_addr: &UnixSocketAddrBound,
+    remote_end: Arc<Endpoint>,
+) -> Result<()> {
+    BACKLOG_TABLE.push_incoming(remote_addr, remote_end)
 }

services/libs/jinux-std/src/net/socket/unix/stream/mod.rs

@@ -1,9 +1,7 @@
 mod connected;
 mod endpoint;
 mod init;
-mod listen;
 mod listener;
-pub mod stream;
+mod stream;
 
-pub use listener::{ActiveListeners, ACTIVE_LISTENERS};
 pub use stream::UnixStreamSocket;

services/libs/jinux-std/src/net/socket/unix/stream/stream.rs

@@ -1,6 +1,8 @@
 use crate::fs::file_handle::FileLike;
-use crate::fs::utils::{IoEvents, Poller, StatusFlags};
+use crate::fs::fs_resolver::FsPath;
-use crate::net::socket::unix::addr::UnixSocketAddr;
+use crate::fs::utils::{Dentry, InodeType, IoEvents, Poller, StatusFlags};
+use crate::net::socket::unix::addr::UnixSocketAddrBound;
+use crate::net::socket::unix::UnixSocketAddr;
 use crate::net::socket::util::send_recv_flags::SendRecvFlags;
 use crate::net::socket::util::sockaddr::SocketAddr;
 use crate::net::socket::{SockShutdownCmd, Socket};
@@ -9,40 +11,59 @@ use crate::prelude::*;
 use super::connected::Connected;
 use super::endpoint::Endpoint;
 use super::init::Init;
-use super::listen::Listen;
+use super::listener::{unregister_backlog, Listener};
-use super::ACTIVE_LISTENERS;
 
-pub struct UnixStreamSocket(RwLock<Status>);
+pub struct UnixStreamSocket(RwLock<State>);
 
-enum Status {
+impl UnixStreamSocket {
-    Init(Init),
+    pub(super) fn new_init(init: Init) -> Self {
-    Listen(Listen),
+        Self(RwLock::new(State::Init(Arc::new(init))))
-    Connected(Connected),
+    }
+
+    pub(super) fn new_listen(listen: Listener) -> Self {
+        Self(RwLock::new(State::Listen(Arc::new(listen))))
+    }
+
+    pub(super) fn new_connected(connected: Connected) -> Self {
+        Self(RwLock::new(State::Connected(Arc::new(connected))))
+    }
+}
+
+enum State {
+    Init(Arc<Init>),
+    Listen(Arc<Listener>),
+    Connected(Arc<Connected>),
 }
 
 impl UnixStreamSocket {
     pub fn new(nonblocking: bool) -> Self {
-        let status = Status::Init(Init::new(nonblocking));
+        let init = Init::new(nonblocking);
-        Self(RwLock::new(status))
+        Self::new_init(init)
     }
 
     pub fn new_pair(nonblocking: bool) -> Result<(Arc<Self>, Arc<Self>)> {
-        let (end_a, end_b) = Endpoint::end_pair(nonblocking)?;
+        let (end_a, end_b) = Endpoint::new_pair(nonblocking)?;
-        let connected_a = UnixStreamSocket(RwLock::new(Status::Connected(Connected::new(end_a))));
+        let connected_a = {
-        let connected_b = UnixStreamSocket(RwLock::new(Status::Connected(Connected::new(end_b))));
+            let connected = Connected::new(end_a);
+            Self::new_connected(connected)
+        };
+        let connected_b = {
+            let connected = Connected::new(end_b);
+            Self::new_connected(connected)
+        };
         Ok((Arc::new(connected_a), Arc::new(connected_b)))
     }
 
-    fn bound_addr(&self) -> Option<UnixSocketAddr> {
+    fn bound_addr(&self) -> Option<UnixSocketAddrBound> {
         let status = self.0.read();
         match &*status {
-            Status::Init(init) => init.bound_addr().map(Clone::clone),
+            State::Init(init) => init.addr(),
-            Status::Listen(listen) => Some(listen.addr().clone()),
+            State::Listen(listen) => Some(listen.addr().clone()),
-            Status::Connected(connected) => connected.addr(),
+            State::Connected(connected) => connected.addr(),
         }
     }
 
-    fn supported_flags(status_flags: &StatusFlags) -> StatusFlags {
+    fn mask_flags(status_flags: &StatusFlags) -> StatusFlags {
         const SUPPORTED_FLAGS: StatusFlags = StatusFlags::O_NONBLOCK;
         const UNSUPPORTED_FLAGS: StatusFlags = SUPPORTED_FLAGS.complement();
 
@@ -71,22 +92,18 @@ impl FileLike for UnixStreamSocket {
     fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {
         let inner = self.0.read();
         match &*inner {
-            Status::Init(init) => init.poll(mask, poller),
+            State::Init(init) => init.poll(mask, poller),
-            Status::Listen(listen) => {
+            State::Listen(listen) => listen.poll(mask, poller),
-                let addr = listen.addr();
+            State::Connected(connected) => connected.poll(mask, poller),
-                let listener = ACTIVE_LISTENERS.get_listener(addr).unwrap();
-                listener.poll(mask, poller)
-            }
-            Status::Connected(connet) => todo!(),
         }
     }
 
     fn status_flags(&self) -> StatusFlags {
         let inner = self.0.read();
         let is_nonblocking = match &*inner {
-            Status::Init(init) => init.is_nonblocking(),
+            State::Init(init) => init.is_nonblocking(),
-            Status::Listen(listen) => listen.is_nonblocking(),
+            State::Listen(listen) => listen.is_nonblocking(),
-            Status::Connected(connected) => connected.is_nonblocking(),
+            State::Connected(connected) => connected.is_nonblocking(),
         };
 
         if is_nonblocking {
@@ -98,15 +115,15 @@ impl FileLike for UnixStreamSocket {
 
     fn set_status_flags(&self, new_flags: StatusFlags) -> Result<()> {
         let is_nonblocking = {
-            let supported_flags = Self::supported_flags(&new_flags);
+            let supported_flags = Self::mask_flags(&new_flags);
             supported_flags.contains(StatusFlags::O_NONBLOCK)
         };
 
         let mut inner = self.0.write();
         match &mut *inner {
-            Status::Init(init) => init.set_nonblocking(is_nonblocking),
+            State::Init(init) => init.set_nonblocking(is_nonblocking),
-            Status::Listen(listen) => listen.set_nonblocking(is_nonblocking),
+            State::Listen(listen) => listen.set_nonblocking(is_nonblocking),
-            Status::Connected(connected) => connected.set_nonblocking(is_nonblocking),
+            State::Connected(connected) => connected.set_nonblocking(is_nonblocking),
         }
         Ok(())
     }
@@ -115,114 +132,93 @@ impl FileLike for UnixStreamSocket {
 impl Socket for UnixStreamSocket {
     fn bind(&self, sockaddr: SocketAddr) -> Result<()> {
         let addr = UnixSocketAddr::try_from(sockaddr)?;
-        let mut inner = self.0.write();
+
-        match &mut *inner {
+        let init = match &*self.0.read() {
-            Status::Init(init) => init.bind(addr),
+            State::Init(init) => init.clone(),
-            Status::Listen(_) | Status::Connected(_) => {
+            _ => return_errno_with_message!(
-                return_errno_with_message!(
+                Errno::EINVAL,
-                    Errno::EINVAL,
+                "cannot bind a listening or connected socket"
-                    "cannot bind a listening or connected socket"
+            ),
-                );
+            // FIXME: Maybe binding a connected socket should also be allowed?
-            } // FIXME: Maybe binding a connected sockted should also be allowed?
+        };
-        }
+
+        init.bind(&addr)
     }
 
     fn connect(&self, sockaddr: SocketAddr) -> Result<()> {
-        let mut inner = self.0.write();
+        let remote_addr = {
-        match &*inner {
+            let unix_socket_addr = UnixSocketAddr::try_from(sockaddr)?;
-            Status::Init(init) => {
+            match unix_socket_addr {
-                let remote_addr = UnixSocketAddr::try_from(sockaddr)?;
+                UnixSocketAddr::Abstract(abstract_name) => {
-                let addr = init.bound_addr();
+                    UnixSocketAddrBound::Abstract(abstract_name)
-                if let Some(addr) = addr {
+                }
-                    if addr.path() == remote_addr.path() {
+                UnixSocketAddr::Path(path) => {
-                        return_errno_with_message!(
+                    let dentry = lookup_socket_file(&path)?;
-                            Errno::EINVAL,
+                    UnixSocketAddrBound::Path(dentry)
-                            "try to connect to self is invalid"
-                        );
-                    }
                 }
-                let (this_end, remote_end) = Endpoint::end_pair(init.is_nonblocking())?;
-                remote_end.set_addr(remote_addr.clone());
-                if let Some(addr) = addr {
-                    this_end.set_addr(addr.clone());
-                };
-                ACTIVE_LISTENERS.push_incoming(&remote_addr, remote_end)?;
-                *inner = Status::Connected(Connected::new(this_end));
-                Ok(())
             }
-            Status::Listen(_) => {
+        };
-                return_errno_with_message!(Errno::EINVAL, "the socket is listened")
+
-            }
+        let init = match &*self.0.read() {
-            Status::Connected(_) => {
+            State::Init(init) => init.clone(),
+            State::Listen(_) => return_errno_with_message!(Errno::EINVAL, "the socket is listened"),
+            State::Connected(_) => {
                 return_errno_with_message!(Errno::EISCONN, "the socket is connected")
             }
-        }
+        };
+
+        let connected = init.connect(&remote_addr)?;
+
+        *self.0.write() = State::Connected(Arc::new(connected));
+        Ok(())
     }
 
     fn listen(&self, backlog: usize) -> Result<()> {
-        let mut inner = self.0.write();
+        let init = match &*self.0.read() {
-        match &*inner {
+            State::Init(init) => init.clone(),
-            Status::Init(init) => {
+            State::Listen(_) => {
-                let addr = init.bound_addr().ok_or(Error::with_message(
+                return_errno_with_message!(Errno::EINVAL, "the socket is already listening")
-                    Errno::EINVAL,
-                    "the socket is not bound",
-                ))?;
-                ACTIVE_LISTENERS.add_listener(addr, backlog)?;
-                *inner = Status::Listen(Listen::new(addr.clone(), init.is_nonblocking()));
-                return Ok(());
             }
-            Status::Listen(_) => {
+            State::Connected(_) => {
-                return_errno_with_message!(Errno::EINVAL, "the socket is already listened")
+                return_errno_with_message!(Errno::EISCONN, "the socket is already connected")
-            }
-            Status::Connected(_) => {
-                return_errno_with_message!(Errno::EINVAL, "the socket is already connected")
             }
         };
+
+        let addr = init.addr().ok_or(Error::with_message(
+            Errno::EINVAL,
+            "the socket is not bound",
+        ))?;
+
+        let listener = Listener::new(addr.clone(), backlog, init.is_nonblocking())?;
+        *self.0.write() = State::Listen(Arc::new(listener));
+        Ok(())
     }
 
     fn accept(&self) -> Result<(Arc<dyn FileLike>, SocketAddr)> {
-        let inner = self.0.read();
+        let listen = match &*self.0.read() {
-        match &*inner {
+            State::Listen(listen) => listen.clone(),
-            Status::Listen(listen) => {
+            _ => return_errno_with_message!(Errno::EINVAL, "the socket is not listening"),
-                let is_nonblocking = listen.is_nonblocking();
+        };
-                let addr = listen.addr().clone();
-                drop(inner);
-                // Avoid lock when waiting
-                let connected = {
-                    let local_endpoint = ACTIVE_LISTENERS.pop_incoming(is_nonblocking, &addr)?;
-                    Connected::new(local_endpoint)
-                };
 
-                let peer_addr = match connected.peer_addr() {
+        listen.accept()
-                    None => SocketAddr::Unix(String::new()),
-                    Some(addr) => SocketAddr::from(addr.clone()),
-                };
-
-                let socket = UnixStreamSocket(RwLock::new(Status::Connected(connected)));
-                return Ok((Arc::new(socket), peer_addr));
-            }
-            Status::Connected(_) | Status::Init(_) => {
-                return_errno_with_message!(Errno::EINVAL, "the socket is not listened")
-            }
-        }
     }
 
     fn shutdown(&self, cmd: SockShutdownCmd) -> Result<()> {
-        let inner = self.0.read();
+        let connected = match &*self.0.read() {
-        if let Status::Connected(connected) = &*inner {
+            State::Connected(connected) => connected.clone(),
-            connected.shutdown(cmd)
+            _ => return_errno_with_message!(Errno::ENOTCONN, "the socked is not connected"),
-        } else {
+        };
-            return_errno_with_message!(Errno::ENOTCONN, "the socked is not connected");
+
-        }
+        connected.shutdown(cmd)
     }
 
     fn addr(&self) -> Result<SocketAddr> {
-        let inner = self.0.read();
+        let addr = match &*self.0.read() {
-        let addr = match &*inner {
+            State::Init(init) => init.addr(),
-            Status::Init(init) => init.bound_addr().map(Clone::clone),
+            State::Listen(listen) => Some(listen.addr().clone()),
-            Status::Listen(listen) => Some(listen.addr().clone()),
+            State::Connected(connected) => connected.addr(),
-            Status::Connected(connected) => connected.addr(),
         };
+
         addr.map(Into::<SocketAddr>::into)
             .ok_or(Error::with_message(
                 Errno::EINVAL,
@@ -231,31 +227,28 @@ impl Socket for UnixStreamSocket {
     }
 
     fn peer_addr(&self) -> Result<SocketAddr> {
-        let inner = self.0.read();
+        let connected = match &*self.0.read() {
-        if let Status::Connected(connected) = &*inner {
+            State::Connected(connected) => connected.clone(),
-            match connected.peer_addr() {
+            _ => return_errno_with_message!(Errno::ENOTCONN, "the socket is not connected"),
-                None => return Ok(SocketAddr::Unix(String::new())),
+        };
-                Some(peer_addr) => {
+
-                    return Ok(SocketAddr::from(peer_addr.clone()));
+        match connected.peer_addr() {
-                }
+            None => return Ok(SocketAddr::Unix(UnixSocketAddr::Path(String::new()))),
+            Some(peer_addr) => {
+                return Ok(SocketAddr::from(peer_addr.clone()));
             }
         }
-        return_errno_with_message!(Errno::EINVAL, "the socket is not connected");
     }
 
     fn recvfrom(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
-        let inner = self.0.read();
+        let connected = match &*self.0.read() {
-        // TODO: deal with flags
+            State::Connected(connected) => connected.clone(),
-        match &*inner {
+            _ => return_errno_with_message!(Errno::ENOTCONN, "the socket is not connected"),
-            Status::Connected(connected) => {
+        };
-                let read_size = connected.read(buf)?;
+
-                let peer_addr = self.peer_addr()?;
+        let peer_addr = self.peer_addr()?;
-                Ok((read_size, peer_addr))
+        let read_size = connected.read(buf)?;
-            }
+        Ok((read_size, peer_addr))
-            Status::Init(_) | Status::Listen(_) => {
-                return_errno_with_message!(Errno::EINVAL, "the socket is not connected")
-            }
-        }
     }
 
     fn sendto(
@@ -266,13 +259,12 @@ impl Socket for UnixStreamSocket {
     ) -> Result<usize> {
         debug_assert!(remote.is_none());
         // TODO: deal with flags
-        let inner = self.0.read();
+        let connected = match &*self.0.read() {
-        match &*inner {
+            State::Connected(connected) => connected.clone(),
-            Status::Connected(connected) => connected.write(buf),
+            _ => return_errno_with_message!(Errno::ENOTCONN, "the socket is not connected"),
-            Status::Init(_) | Status::Listen(_) => {
+        };
-                return_errno_with_message!(Errno::EINVAL, "the socket is not connected")
+
-            }
+        connected.write(buf)
-        }
     }
 }
 
@@ -282,6 +274,26 @@ impl Drop for UnixStreamSocket {
             return;
         };
 
-        ACTIVE_LISTENERS.remove_listener(&bound_addr);
+        if let State::Listen(_) = &*self.0.read() {
+            unregister_backlog(&bound_addr);
+        }
     }
 }
+
+fn lookup_socket_file(path: &str) -> Result<Arc<Dentry>> {
+    let dentry = {
+        let current = current!();
+        let fs = current.fs().read();
+        let fs_path = FsPath::try_from(path)?;
+        fs.lookup(&fs_path)?
+    };
+
+    if dentry.inode_type() != InodeType::Socket {
+        return_errno_with_message!(Errno::ENOTSOCK, "not a socket file")
+    }
+
+    if !dentry.inode_mode().is_readable() || !dentry.inode_mode().is_writable() {
+        return_errno_with_message!(Errno::EACCES, "the socket cannot be read or written")
+    }
+    return Ok(dentry);
+}

services/libs/jinux-std/src/net/socket/util/send_recv_flags.rs

@@ -1,10 +1,10 @@
 use crate::prelude::*;
 
 bitflags! {
-    #[repr(C)]
-    #[derive(Pod)]
     /// Flags used for send/recv.
     /// The definiton is from https://elixir.bootlin.com/linux/v6.0.9/source/include/linux/socket.h
+    #[repr(C)]
+    #[derive(Pod)]
     pub struct SendRecvFlags: i32 {
         const MSG_OOB = 1;
         const MSG_PEEK	= 2;

services/libs/jinux-std/src/net/socket/util/shutdown_cmd.rs

@@ -1,10 +1,10 @@
 use crate::prelude::*;
 
+/// Shutdown types
+/// From https://elixir.bootlin.com/linux/v6.0.9/source/include/linux/net.h
 #[repr(i32)]
 #[derive(Debug, Clone, Copy, PartialEq, Eq, TryFromInt)]
 #[allow(non_camel_case_types)]
-/// Shutdown types
-/// From https://elixir.bootlin.com/linux/v6.0.9/source/include/linux/net.h
 pub enum SockShutdownCmd {
     /// Shutdown receptions
     SHUT_RD = 0,

services/libs/jinux-std/src/net/socket/util/sock_options.rs

@@ -1,10 +1,10 @@
 use crate::prelude::*;
 
+/// The definition is from https://elixir.bootlin.com/linux/v6.0.9/source/include/uapi/asm-generic/socket.h.
+/// We do not include all options here
 #[repr(i32)]
 #[derive(Debug, Clone, Copy, TryFromInt, PartialEq, Eq, PartialOrd, Ord)]
 #[allow(non_camel_case_types)]
-/// The definition is from https://elixir.bootlin.com/linux/v6.0.9/source/include/uapi/asm-generic/socket.h.
-/// We do not include all options here
 pub enum SockOptionName {
     SO_DEBUG = 1,
     SO_REUSEADDR = 2,
@@ -27,10 +27,10 @@ pub enum SockOptionName {
     SO_SNDTIMEO_NEW = 67,
 }
 
+/// Sock Opt level. The definition is from https://elixir.bootlin.com/linux/v6.0.9/source/include/linux/socket.h#L343
 #[repr(i32)]
 #[derive(Debug, Clone, Copy, TryFromInt, PartialEq, Eq)]
 #[allow(non_camel_case_types)]
-/// Sock Opt level. The definition is from https://elixir.bootlin.com/linux/v6.0.9/source/include/linux/socket.h#L343
 pub enum SockOptionLevel {
     SOL_IP = 0,
     SOL_SOCKET = 1,

services/libs/jinux-std/src/net/socket/util/sockaddr.rs

@@ -1,12 +1,13 @@
 use crate::net::iface::{IpAddress, Ipv4Address};
 use crate::net::iface::{IpEndpoint, IpListenEndpoint};
+use crate::net::socket::unix::UnixSocketAddr;
 use crate::prelude::*;
 
 type PortNum = u16;
 
 #[derive(Debug)]
 pub enum SocketAddr {
-    Unix(String),
+    Unix(UnixSocketAddr),
     IPv4(Ipv4Address, PortNum),
     IPv6,
 }

services/libs/jinux-std/src/prelude.rs

@@ -19,12 +19,12 @@ pub(crate) use core::fmt::Debug;
 pub(crate) use int_to_c_enum::TryFromInt;
 pub(crate) use jinux_frame::config::PAGE_SIZE;
 // pub(crate) use jinux_frame::sync::{Mutex, MutexGuard};
+pub(crate) use jinux_frame::sync::{RwLock, RwLockReadGuard, RwLockWriteGuard};
 pub(crate) use jinux_frame::sync::{SpinLock, SpinLockGuard};
 pub(crate) use jinux_frame::vm::Vaddr;
 pub(crate) use jinux_frame::{print, println};
 pub(crate) use log::{debug, error, info, trace, warn};
 pub(crate) use pod::Pod;
-pub(crate) use spin::RwLock;
 pub(crate) use spin::{Mutex, MutexGuard};
 
 /// return current process

services/libs/jinux-std/src/process/signal/mod.rs

@@ -72,7 +72,7 @@ pub fn handle_pending_signal(context: &mut UserContext) -> Result<()> {
                     SigDefaultAction::Core | SigDefaultAction::Term => {
                         warn!(
                             "{:?}: terminating on signal {}",
-                            current.executable_path().read(),
+                            &*current.executable_path().read(),
                             sig_num.sig_name()
                         );
                         // FIXME: How to set correct status if process is terminated

services/libs/jinux-std/src/util/net/addr.rs

@@ -1,4 +1,5 @@
 use crate::net::iface::Ipv4Address;
+use crate::net::socket::unix::UnixSocketAddr;
 use crate::net::socket::SocketAddr;
 use crate::prelude::*;
 use crate::util::{read_bytes_from_user, read_val_from_user, write_val_to_user};
@@ -22,12 +23,19 @@ pub fn read_socket_addr_from_user(addr: Vaddr, addr_len: usize) -> Result<Socket
                 bytes
             };
 
-            let path = {
+            let unix_socket_addr = if bytes.starts_with(&[0]) {
+                // Abstract unix socket addr
+                let cstr = CStr::from_bytes_until_nul(&bytes[1..])?;
+                let abstract_path = cstr.to_string_lossy().to_string();
+                UnixSocketAddr::Abstract(abstract_path)
+            } else {
+                // Normal unix sockket addr
                 let cstr = CStr::from_bytes_until_nul(&bytes)?;
-                cstr.to_string_lossy().to_string()
+                let path = cstr.to_string_lossy().to_string();
+                UnixSocketAddr::Path(path)
             };
 
-            SocketAddr::Unix(path)
+            SocketAddr::Unix(unix_socket_addr)
         }
         SaFamily::AF_INET => {
             debug_assert!(addr_len >= core::mem::size_of::<SockAddrInet>());
@@ -58,7 +66,7 @@ pub fn write_socket_addr_to_user(
     let max_len = read_val_from_user::<i32>(addrlen_ptr)? as usize;
     let write_size = match socket_addr {
         SocketAddr::Unix(path) => {
-            let sock_addr_unix = SockAddrUnix::try_from(path.as_str())?;
+            let sock_addr_unix = SockAddrUnix::try_from(path)?;
             let write_size = core::mem::size_of::<SockAddrUnix>();
             debug_assert!(max_len >= write_size);
             write_val_to_user(dest, &sock_addr_unix)?;
@@ -80,9 +88,9 @@ pub fn write_socket_addr_to_user(
     Ok(())
 }
 
+/// PlaceHolder
 #[derive(Debug, Clone, Copy, Pod)]
 #[repr(C)]
-/// PlaceHolder
 pub struct SockAddr {
     sa_family: u16, // SaFamily
     sa_data: [u8; 14],
@@ -103,9 +111,9 @@ pub struct SockAddrUnix {
     sun_path: [u8; SOCK_ADDR_UNIX_LEN],
 }
 
+/// IPv4 4-byte address
 #[repr(C)]
 #[derive(Debug, Clone, Copy, Pod)]
-/// IPv4 4-byte address
 pub struct InetAddr {
     s_addr: [u8; 4],
 }
@@ -140,9 +148,9 @@ impl PortNum {
     }
 }
 
+/// IPv4 socket address
 #[repr(C)]
 #[derive(Debug, Clone, Copy, Pod)]
-/// IPv4 socket address
 pub struct SockAddrInet {
     /// always SaFamily::AF_INET
     sin_family: u16,
@@ -168,7 +176,6 @@ impl SockAddrInet {
 
 #[repr(C)]
 #[derive(Debug, Clone, Copy, Pod)]
-/// IPv6 address
 pub struct Inet6Addr {
     s6_addr: [u8; 16],
 }
@@ -278,17 +285,22 @@ impl From<SockAddrInet> for SocketAddr {
     }
 }
 
-impl TryFrom<&str> for SockAddrUnix {
+impl TryFrom<&UnixSocketAddr> for SockAddrUnix {
     type Error = Error;
 
-    fn try_from(value: &str) -> Result<Self> {
+    fn try_from(value: &UnixSocketAddr) -> Result<Self> {
         let mut sun_path = [0u8; SOCK_ADDR_UNIX_LEN];
-        let bytes = value.as_bytes();
+        match value {
-        let copy_len = bytes.len().min(SOCK_ADDR_UNIX_LEN - 1);
+            UnixSocketAddr::Path(path) => {
-        sun_path[..copy_len].copy_from_slice(&bytes[..copy_len]);
+                let bytes = path.as_bytes();
-        Ok(SockAddrUnix {
+                let copy_len = bytes.len().min(SOCK_ADDR_UNIX_LEN - 1);
-            sun_family: SaFamily::AF_UNIX as u16,
+                sun_path[..copy_len].copy_from_slice(&bytes[..copy_len]);
-            sun_path,
+                Ok(SockAddrUnix {
-        })
+                    sun_family: SaFamily::AF_UNIX as u16,
+                    sun_path,
+                })
+            }
+            UnixSocketAddr::Abstract(_) => todo!(),
+        }
     }
 }

services/libs/jinux-std/src/util/net/socket.rs

@@ -1,10 +1,10 @@
 use crate::prelude::*;
 
+/// Standard well-defined IP protocols.
+/// From https://elixir.bootlin.com/linux/v6.0.9/source/include/uapi/linux/in.h.
 #[repr(i32)]
 #[derive(Debug, Clone, Copy, TryFromInt)]
 #[allow(non_camel_case_types)]
-/// Standard well-defined IP protocols.
-/// From https://elixir.bootlin.com/linux/v6.0.9/source/include/uapi/linux/in.h.
 pub enum Protocol {
     IPPROTO_IP = 0,         /* Dummy protocol for TCP		*/
     IPPROTO_ICMP = 1,       /* Internet Control Message Protocol	*/
@@ -34,11 +34,11 @@ pub enum Protocol {
     IPPROTO_MPTCP = 262,    /* Multipath TCP connection		*/
 }
 
+/// Socket types.
+/// From https://elixir.bootlin.com/linux/v6.0.9/source/include/linux/net.h
 #[repr(i32)]
 #[allow(non_camel_case_types)]
 #[derive(Debug, Clone, Copy, TryFromInt)]
-/// Socket types.
-/// From https://elixir.bootlin.com/linux/v6.0.9/source/include/linux/net.h
 pub enum SockType {
     /// Stream socket
     SOCK_STREAM = 1,