5     filesystem::vfs::file::FileDescriptorVec,
16     file::{File, FileMode},
176         let mut file: File = File::new(inode, mode)?;  in open()  localVariable
180             file.lseek(SeekFrom::SeekEnd(0))?;  in open()
184         let r = current_pcb().alloc_fd(file, None).map(|fd| fd as usize);  in open()
208         let file: Option<&mut File> = current_pcb().get_file_mut_by_fd(fd);  in read()  localVariable
209         if file.is_none() {  in read()
212         let file: &mut File = file.unwrap();  in read()  localVariable
214         return file.read(buf.len(), buf);  in read()
226         let file: Option<&mut File> = current_pcb().get_file_mut_by_fd(fd);  in write()  localVariable
227         if file.is_none() {  in write()
230         let file: &mut File = file.unwrap();  in write()  localVariable
232         return file.write(buf.len(), buf);  in write()
244         let file: Option<&mut File> = current_pcb().get_file_mut_by_fd(fd);  in lseek()  localVariable
245         if file.is_none() {  in lseek()
248         let file: &mut File = file.unwrap();  in lseek()  localVariable
249         return file.lseek(seek);  in lseek()
317         let file: &mut File = match current_pcb().get_file_mut_by_fd(fd) {  in getdents()  localVariable
321             Some(file) => file,  in getdents()
325         return file.readdir(dirent).map(|x| x as usize);  in getdents()
382                 if let Some(file) = &fds.fds[oldfd as usize] {  in dup()
384                     let file_cp: Box<File> = file.try_clone().ok_or(SystemError::EBADF)?;  in dup()
422                 if let Some(file) = &fds.fds[oldfd as usize] {  in dup2()
432                     let file_cp = file.try_clone();  in dup2()
480                         if let Some(file) = &fds.fds[fd as usize] {  in fcntl()
481                             if file.close_on_exec() {  in fcntl()
494                         if let Some(file) = &mut fds.fds[fd as usize] {  in fcntl()
497                                 file.set_close_on_exec(true);  in fcntl()
499                                 file.set_close_on_exec(false);  in fcntl()
513                         if let Some(file) = &fds.fds[fd as usize] {  in fcntl()
514                             return Ok(file.mode().bits() as usize);  in fcntl()
525                         if let Some(file) = &mut fds.fds[fd as usize] {  in fcntl()
528                             file.set_mode(mode)?;  in fcntl()
565                 if let Some(file) = &mut fds.fds[fd as usize] {  in ftruncate()
566                     let r = file.ftruncate(len).map(|_| 0);  in ftruncate()
577             Some(file) => {  in do_fstat()
580                 match file.metadata() {  in do_fstat()
600                         match file.file_type() {  in do_fstat()