129     pub fn open(path: &str, mode: FileMode) -> Result<usize, SystemError> {  in open()  argument
132         if path.len() > PAGE_4K_SIZE as usize {  in open()
184         let r = current_pcb().alloc_fd(file, None).map(|fd| fd as usize);  in open()
194     pub fn close(fd: usize) -> Result<usize, SystemError> {  in close()  argument
206     pub fn read(fd: i32, buf: &mut [u8]) -> Result<usize, SystemError> {  in read()  argument
224     pub fn write(fd: i32, buf: &[u8]) -> Result<usize, SystemError> {  in write()  argument
242     pub fn lseek(fd: i32, seek: SeekFrom) -> Result<usize, SystemError> {  in lseek()  argument
274     pub fn chdir(dest_path: &str) -> Result<usize, SystemError> {  in chdir()  argument
308     pub fn getdents(fd: i32, buf: &mut [u8]) -> Result<usize, SystemError> {  in getdents()  argument
325         return file.readdir(dirent).map(|x| x as usize);  in getdents()
333     pub fn mkdir(path: &str, mode: usize) -> Result<usize, SystemError> {  in mkdir()  argument
334         return do_mkdir(path, FileMode::from_bits_truncate(mode as u32)).map(|x| x as usize);  in mkdir()
346     pub fn unlinkat(_dirfd: i32, pathname: &str, flags: u32) -> Result<usize, SystemError> {  in unlinkat()  argument
377     pub fn dup(oldfd: i32) -> Result<usize, SystemError> {  in dup()  argument
382                 if let Some(file) = &fds.fds[oldfd as usize] {  in dup()
387                     let res = current_pcb().alloc_fd(*file_cp, None).map(|x| x as usize);  in dup()
412     pub fn dup2(oldfd: i32, newfd: i32) -> Result<usize, SystemError> {  in dup2()  argument
419                     return Ok(newfd as usize);  in dup2()
422                 if let Some(file) = &fds.fds[oldfd as usize] {  in dup2()
423                     if fds.fds[newfd as usize].is_some() {  in dup2()
439                         .map(|x| x as usize);  in dup2()
459     pub fn fcntl(fd: i32, cmd: FcntlCommand, arg: i32) -> Result<usize, SystemError> {  in fcntl()  argument
462                 if arg < 0 || arg as usize >= FileDescriptorVec::PROCESS_MAX_FD {  in fcntl()
465                 let arg = arg as usize;  in fcntl()
468                         if fds.fds[i as usize].is_none() {  in fcntl()
480                         if let Some(file) = &fds.fds[fd as usize] {  in fcntl()
482                                 return Ok(FD_CLOEXEC as usize);  in fcntl()
494                         if let Some(file) = &mut fds.fds[fd as usize] {  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()
562     pub fn ftruncate(fd: i32, len: usize) -> Result<usize, SystemError> {  in ftruncate()  argument
565                 if let Some(file) = &mut fds.fds[fd as usize] {  in ftruncate()
620     pub fn fstat(fd: i32, usr_kstat: *mut PosixKstat) -> Result<usize, SystemError> {  in fstat()  argument
642     pub iov_len: usize,
662         iovcnt: usize,  in from_user()  argument
667             iov as usize as u64,  in from_user()
684             if !verify_area(iov.iov_base as usize as u64, iov.iov_len as u64) {  in from_user()
727         let total_len: usize = self.0.iter().map(|slice| slice.len()).sum();  in new_buf()