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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       interface, which is superseded by getdents(2).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 (privately in Linux kernel file fs/readdir.c)
       as follows:

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

       d_ino is an inode number.  d_offset 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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       project, information about reporting bugs, and the latest version of  this  page,  can  be
       found at