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

NAME
       readdir - read directory entry

SYNOPSIS
       int readdir(unsigned int fd, struct oldlinuxdirent *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       kernel system call interface, which is superseded by getdents(2).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  oldlinuxdirent  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 oldlinuxdirent
       structure is read.

       The oldlinuxdirent structure is declared as follows:

           struct oldlinuxdirent {
               long  dino;              /* inode number */
               offt doff;              /* offset to this oldlinuxdirent */
               unsigned short dreclen;  /* length of this dname */
               char  dname[NAMEMAX+1]; /* filename (null-terminated) */
           }

       dino is an inode number.  doff is the distance from the start of  the
       directory  to  this  oldlinuxdirent.  dreclen is the size of dname,
       not counting the terminating null byte ('\0').  dname is a null-termi‐
       nated 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 oldlinuxdirent 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 3.53 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                             2013-06-21                        READDIR(2)