21     syscall::SystemError,
117     fn open_status(&self, pdata: &mut ProcfsFilePrivateData) -> Result<i64, SystemError> {  in open_status()  argument
126             return Err(SystemError::ESRCH);  in open_status()
203     ) -> Result<usize, SystemError> {  in read_status()  argument
209             return Err(SystemError::ENOBUFS);  in read_status()
283     pub fn register_pid(&self, pid: i64) -> Result<(), SystemError> {  in register_pid()  argument
305     pub fn unregister_pid(&self, pid: i64) -> Result<(), SystemError> {  in unregister_pid()  argument
324     fn open(&self, data: &mut FilePrivateData, _mode: &FileMode) -> Result<(), SystemError> {  in open()  argument
347     fn close(&self, data: &mut FilePrivateData) -> Result<(), SystemError> {  in close()  argument
371     ) -> Result<usize, SystemError> {  in read_at()  argument
373             return Err(SystemError::EINVAL);  in read_at()
380             return Err(SystemError::EISDIR);  in read_at()
403             return Err(SystemError::ENOBUFS);  in read_at()
418     ) -> Result<usize, SystemError> {  in write_at()  argument
419         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in write_at()
422     fn poll(&self) -> Result<PollStatus, SystemError> {  in poll()  argument
428             return Err(SystemError::EISDIR);  in poll()
442     fn metadata(&self) -> Result<Metadata, SystemError> {  in metadata()  argument
449     fn set_metadata(&self, metadata: &Metadata) -> Result<(), SystemError> {  in set_metadata()  argument
461     fn resize(&self, len: usize) -> Result<(), SystemError> {  in resize()  argument
467             return Err(SystemError::EINVAL);  in resize()
477     ) -> Result<Arc<dyn IndexNode>, SystemError> {  in create_with_data()  argument
482             return Err(SystemError::ENOTDIR);  in create_with_data()
486             return Err(SystemError::EEXIST);  in create_with_data()
528     fn link(&self, name: &str, other: &Arc<dyn IndexNode>) -> Result<(), SystemError> {  in link()  argument
531             .ok_or(SystemError::EPERM)?;  in link()
537             return Err(SystemError::ENOTDIR);  in link()
542             return Err(SystemError::EISDIR);  in link()
547             return Err(SystemError::EEXIST);  in link()
559     fn unlink(&self, name: &str) -> Result<(), SystemError> {  in unlink()  argument
563             return Err(SystemError::ENOTDIR);  in unlink()
567             return Err(SystemError::ENOTEMPTY);  in unlink()
571         let to_delete = inode.children.get(name).ok_or(SystemError::ENOENT)?;  in unlink()
584     ) -> Result<(), SystemError> {  in move_()  argument
585         return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);  in move_()
588     fn find(&self, name: &str) -> Result<Arc<dyn IndexNode>, SystemError> {  in find()  argument
592             return Err(SystemError::ENOTDIR);  in find()
597                 return Ok(inode.self_ref.upgrade().ok_or(SystemError::ENOENT)?);  in find()
601                 return Ok(inode.parent.upgrade().ok_or(SystemError::ENOENT)?);  in find()
605                 return Ok(inode.children.get(name).ok_or(SystemError::ENOENT)?.clone());  in find()
610     fn get_entry_name(&self, ino: InodeId) -> Result<String, SystemError> {  in get_entry_name()  argument
613             return Err(SystemError::ENOTDIR);  in get_entry_name()
634                         0=>{return Err(SystemError::ENOENT);}  in get_entry_name()
642     fn list(&self) -> Result<Vec<String>, SystemError> {  in list()  argument
645             return Err(SystemError::ENOTDIR);  in list()
668 pub fn procfs_register_pid(pid: pid_t) -> Result<(), SystemError> {  in procfs_register_pid()  argument
694 pub fn procfs_unregister_pid(pid: pid_t) -> Result<(), SystemError> {  in procfs_unregister_pid()  argument