diff --git a/kernel/src/fs/file_like.rs b/kernel/src/fs/file_like.rs
index dbbdbe46..ae5ae6b6 100644
--- a/kernel/src/fs/file_like.rs
+++ b/kernel/src/fs/file_like.rs
@@ -1,11 +1,11 @@
 use core::fmt;
 
+use super::ioctl::*;
 use super::FileHandle;
 use crate::net::Socket;
 use crate::syscall::{SysError, SysResult};
 use alloc::boxed::Box;
 use rcore_fs::vfs::PollStatus;
-use super::ioctl::*;
 
 // TODO: merge FileLike to FileHandle ?
 // TODO: fix dup and remove Clone
diff --git a/kernel/src/fs/ioctl.rs b/kernel/src/fs/ioctl.rs
index dc3d9970..3eb3509e 100644
--- a/kernel/src/fs/ioctl.rs
+++ b/kernel/src/fs/ioctl.rs
@@ -33,4 +33,4 @@ pub const FIONCLEX: usize = 0x6602;
 #[cfg(not(target_arch = "mips"))]
 pub const FIOCLEX: usize = 0x5451;
 #[cfg(target_arch = "mips")]
-pub const FIOCLEX: usize = 0x6601;
\ No newline at end of file
+pub const FIOCLEX: usize = 0x6601;
diff --git a/kernel/src/fs/mod.rs b/kernel/src/fs/mod.rs
index a5e56a1c..0c47c8f6 100644
--- a/kernel/src/fs/mod.rs
+++ b/kernel/src/fs/mod.rs
@@ -1,7 +1,7 @@
 use alloc::{sync::Arc, vec::Vec};
 
-use rcore_fs::vfs::*;
 use rcore_fs::dev::block_cache::BlockCache;
+use rcore_fs::vfs::*;
 use rcore_fs_sfs::SimpleFileSystem;
 
 use crate::drivers::BlockDriver;
@@ -15,10 +15,10 @@ pub use self::stdio::{STDIN, STDOUT};
 mod device;
 mod file;
 mod file_like;
+mod ioctl;
 mod pipe;
 mod pseudo;
 mod stdio;
-mod ioctl;
 
 /// Hard link user programs
 #[cfg(feature = "link_user")]
diff --git a/kernel/src/fs/stdio.rs b/kernel/src/fs/stdio.rs
index 6a73c28f..d13520ae 100644
--- a/kernel/src/fs/stdio.rs
+++ b/kernel/src/fs/stdio.rs
@@ -5,9 +5,9 @@ use core::any::Any;
 
 use rcore_fs::vfs::*;
 
+use super::ioctl::*;
 use crate::sync::Condvar;
 use crate::sync::SpinNoIrqLock as Mutex;
-use super::ioctl::*;
 
 #[derive(Default)]
 pub struct Stdin {
diff --git a/kernel/src/shell.rs b/kernel/src/shell.rs
index 48b7608d..c26b176c 100644
--- a/kernel/src/shell.rs
+++ b/kernel/src/shell.rs
@@ -1,10 +1,10 @@
 //! Kernel shell
 
+use crate::arch::io;
 use crate::fs::ROOT_INODE;
 use crate::process::*;
 use alloc::string::String;
 use alloc::vec::Vec;
-use crate::arch::io;
 
 #[cfg(not(feature = "run_cmdline"))]
 pub fn add_user_shell() {
@@ -47,7 +47,7 @@ pub fn add_user_shell() {
         &inode,
         cmdline.split(' ').map(|s| s.into()).collect(),
         Vec::new(),
-        Vec::new()
+        Vec::new(),
     ));
 }
 
diff --git a/kernel/src/syscall/fs.rs b/kernel/src/syscall/fs.rs
index 895252c5..977529d3 100644
--- a/kernel/src/syscall/fs.rs
+++ b/kernel/src/syscall/fs.rs
@@ -784,14 +784,18 @@ impl Process {
             _ => {}
         }
         match fd_dir_path {
-            "/proc/self/fd" =>{
-                let fd:u32= fd_name.parse::<u32>().unwrap();
-                let fd_path= match self.files.get(&(fd as usize)).unwrap() {
-                    FileLike::File(file) => Some(&file.path),
-                    _ => None,
+            "/proc/self/fd" => {
+                let fd: u32 = fd_name.parse::<u32>().unwrap();
+                let fd_path = match self.files.get(&(fd as usize)) {
+                    Some(FileLike::File(file)) => Some(&file.path),
+                    _ => return Err(SysError::ENOENT),
                 };
-                info!("lookup_inode_at:BEG  /proc/sefl/fd {}, path {}", fd, fd_path.unwrap());
-                if(fd_path.is_some()) {
+                info!(
+                    "lookup_inode_at:BEG  /proc/self/fd {}, path {}",
+                    fd,
+                    fd_path.unwrap()
+                );
+                if (fd_path.is_some()) {
                     return Ok(Arc::new(Pseudo::new(fd_path.unwrap(), FileType::SymLink)));
                 } else {
                     {}
diff --git a/user b/user
index b6a34775..bb73d6ec 160000
--- a/user
+++ b/user
@@ -1 +1 @@
-Subproject commit b6a347750531be125583107b6d0fc307366fdcc9
+Subproject commit bb73d6ecce1ab0e6fae692c51e4335772b0335d4