READDIR(2)                                          Linux Programmer's Manual                                         READDIR(2)



NAME
       readdir - read directory entry

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

DESCRIPTION
       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       page documents the bare kernel system call interface, which is superseded by getdents(2).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 null terminator.  d_name is a null-terminated filename.

RETURN VALUE
       On success, 1 is returned.  On end of directory, 0 is returned.  On error, -1 is returned, and  errno  is  set  appropri-
       ately.

ERRORS
       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.

       ENOTDIR
              File descriptor does not refer to a directory.

CONFORMING TO
       This system call is Linux-specific.

NOTES
       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.

SEE ALSO
       getdents(2), readdir(3)

COLOPHON
       This page is part of release 3.25 of the Linux man-pages project.  A description of the project,  and  information  about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                                                      2008-10-02                                                 READDIR(2)