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Linux 2.6 - man page for readdir (linux section 2)

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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);

       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 conform-
       ing 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       is superseded by getdents(2).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 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 3.55 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)
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