692         for fd in &self.fds {  in fd_open_count()
693             if fd.is_some() {  in fd_open_count()
706     pub fn validate_fd(fd: i32) -> bool {  in validate_fd()
707         return !(fd < 0 || fd as usize > FileDescriptorVec::PROCESS_MAX_FD);  in validate_fd()
721     pub fn alloc_fd(&mut self, file: File, fd: Option<i32>) -> Result<i32, SystemError> {  in alloc_fd()
722         if let Some(new_fd) = fd {  in alloc_fd()
747     pub fn get_file_by_fd(&self, fd: i32) -> Option<Arc<File>> {  in get_file_by_fd()
748         if !FileDescriptorVec::validate_fd(fd) {  in get_file_by_fd()
751         self.fds[fd as usize].clone()  in get_file_by_fd()
759     pub fn drop_fd(&mut self, fd: i32) -> Result<Arc<File>, SystemError> {  in drop_fd()
760         self.get_file_by_fd(fd).ok_or(SystemError::EBADF)?;  in drop_fd()
763         let file = self.fds[fd as usize].take().unwrap();  in drop_fd()
808             let fd = self.index as i32;  in next()  localVariable
810             if let Some(file) = self.fds.get_file_by_fd(fd) {  in next()
811                 return Some((fd, file));  in next()