9     syscall::{Syscall, SystemError},
129     pub fn open(path: &str, mode: FileMode) -> Result<usize, SystemError> {  in open()  argument
133             return Err(SystemError::ENAMETOOLONG);  in open()
136         let inode: Result<Arc<dyn IndexNode>, SystemError> = ROOT_INODE().lookup(path);  in open()
143                 && errno == SystemError::ENOENT  in open()
164             return Err(SystemError::ENOTDIR);  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
210             return Err(SystemError::EBADF);  in read()
224     pub fn write(fd: i32, buf: &[u8]) -> Result<usize, SystemError> {  in write()  argument
228             return Err(SystemError::EBADF);  in write()
242     pub fn lseek(fd: i32, seek: SeekFrom) -> Result<usize, SystemError> {  in lseek()  argument
246             return Err(SystemError::EBADF);  in lseek()
274     pub fn chdir(dest_path: &str) -> Result<usize, SystemError> {  in chdir()  argument
280                 return Err(SystemError::ENOENT);  in chdir()
288                 return Err(SystemError::ENOENT);  in chdir()
294                     return Err(SystemError::ENOTDIR);  in chdir()
308     pub fn getdents(fd: i32, buf: &mut [u8]) -> Result<usize, SystemError> {  in getdents()  argument
310             unsafe { (buf.as_mut_ptr() as *mut Dirent).as_mut() }.ok_or(SystemError::EFAULT)?;  in getdents()
313             return Err(SystemError::EBADF);  in getdents()
319                 return Err(SystemError::EBADF);  in getdents()
333     pub fn mkdir(path: &str, mode: usize) -> Result<usize, SystemError> {  in mkdir()  argument
346     pub fn unlinkat(_dirfd: i32, pathname: &str, flags: u32) -> Result<usize, SystemError> {  in unlinkat()  argument
349             return Err(SystemError::EINVAL);  in unlinkat()
377     pub fn dup(oldfd: i32) -> Result<usize, SystemError> {  in dup()  argument
384                     let file_cp: Box<File> = file.try_clone().ok_or(SystemError::EBADF)?;  in dup()
391                 return Err(SystemError::EBADF);  in dup()
393             return Err(SystemError::EBADF);  in dup()
395             return Err(SystemError::EMFILE);  in dup()
412     pub fn dup2(oldfd: i32, newfd: i32) -> Result<usize, SystemError> {  in dup2()  argument
427                             return Err(SystemError::EIO);  in dup2()
434                         return Err(SystemError::EBADF);  in dup2()
443                 return Err(SystemError::EBADF);  in dup2()
445                 return Err(SystemError::EBADF);  in dup2()
449         return Err(SystemError::EMFILE);  in dup2()
459     pub fn fcntl(fd: i32, cmd: FcntlCommand, arg: i32) -> Result<usize, SystemError> {  in fcntl()  argument
463                     return Err(SystemError::EBADF);  in fcntl()
473                 return Err(SystemError::EMFILE);  in fcntl()
485                         return Err(SystemError::EBADF);  in fcntl()
488                 return Err(SystemError::EBADF);  in fcntl()
503                         return Err(SystemError::EBADF);  in fcntl()
506                 return Err(SystemError::EBADF);  in fcntl()
516                         return Err(SystemError::EBADF);  in fcntl()
519                 return Err(SystemError::EBADF);  in fcntl()
527                             let mode = FileMode::from_bits(arg).ok_or(SystemError::EINVAL)?;  in fcntl()
531                         return Err(SystemError::EBADF);  in fcntl()
534                 return Err(SystemError::EBADF);  in fcntl()
562     pub fn ftruncate(fd: i32, len: usize) -> Result<usize, SystemError> {  in ftruncate()  argument
569                 return Err(SystemError::EBADF);  in ftruncate()
572         return Err(SystemError::EBADF);  in ftruncate()
574     fn do_fstat(fd: i32) -> Result<PosixKstat, SystemError> {  in do_fstat()  argument
616                 return Err(SystemError::EINVAL);  in do_fstat()
620     pub fn fstat(fd: i32, usr_kstat: *mut PosixKstat) -> Result<usize, SystemError> {  in fstat()  argument
624                     return Err(SystemError::EFAULT);  in fstat()
664     ) -> Result<Self, SystemError> {  in from_user()  argument
670             return Err(SystemError::EFAULT);  in from_user()
685                 return Err(SystemError::EFAULT);  in from_user()