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

       readdir - read directory entry

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

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  This page documents the bare kernel system call interface, which is superseded by getdents(2).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

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

       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.

       getdents(2), readdir(3)

       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at

Linux                             2008-10-02                        READDIR(2)