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       readdir - read directory entry


       int readdir(unsigned int fd, struct old_linux_dirent *dirp,
                   unsigned int count);

       Note: There is no glibc wrapper for this system call; see NOTES.


       This  is  not  the  function  you  are  interested  in.   Look at readdir(3) for the POSIX
       conforming C  library  interface.   This  page  documents  the  bare  kernel  system  call
       interface, which is superseded by getdents(2).

       readdir()  reads one old_linux_dirent structure from the directory referred to by the file
       descriptor fd into the buffer pointed to by dirp.  The argument count is ignored; at  most
       one old_linux_dirent structure is read.

       The old_linux_dirent structure is declared as follows:

           struct old_linux_dirent {
               long  d_ino;              /* inode number */
               off_t d_off;              /* offset to this old_linux_dirent */
               unsigned short d_reclen;  /* length of this d_name */
               char  d_name[NAME_MAX+1]; /* filename (null-terminated) */

       d_ino  is  an inode number.  d_off is the distance from the start of the directory to this
       old_linux_dirent.  d_reclen is the size of d_name, not counting the terminating null  byte
       ('\0').  d_name is a null-terminated filename.


       On success, 1 is returned.  On end of directory, 0 is returned.  On error, -1 is returned,
       and errno is set appropriately.


       EBADF  Invalid file descriptor fd.

       EFAULT Argument points outside the calling process's address space.

       EINVAL Result buffer is too small.

       ENOENT No such directory.

              File descriptor does not refer to a directory.


       This system call is Linux-specific.


       Glibc does not provide a wrapper for this system call; call it using syscall(2).  You will
       need  to define the old_linux_dirent structure yourself.  However, probably you should use
       readdir(3) instead.

       This system call does not exist on x86-64.


       getdents(2), readdir(3)


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