NAME

       readdir - read directory entry

SYNOPSIS

       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.

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  This  page  documents  the  bare  kernel  system  call  interface,  which  is  superseded  by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 (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.

RETURN VALUE

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

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.  However, probably you should use readdir(3) instead.

       This system call does not exist on x86-64.

SEE ALSO

       getdents(2), readdir(3)

COLOPHON

       This  page  is  part  of  release  5.10  of  the  Linux man-pages project.  A description of the project,
       information  about  reporting  bugs,  and  the  latest  version  of  this   page,   can   be   found   at
       https://www.kernel.org/doc/man-pages/.

Linux                                              2019-03-06                                         READDIR(2)