NAME

       readdir - read directory entry

SYNOPSIS

       #include <sys/syscall.h>      /* Definition of SYS_* constants */
       #include <unistd.h>

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

       Note: There is no definition of struct old_linux_dirent; 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       interface, which is superseded by getdents(2).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 to indicate the error.

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

       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 5.13 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/.