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       readdir - read directory entry


       #include <linux/types.h>
       #include <linux/dirent.h>
       #include <linux/unistd.h>
       #include <errno.h>

       _syscall3(int, readdir, unsigned int, fd, struct dirent *, dirp,
                 unsigned int, count)

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


       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       kernel system call interface, which can change, and which is superseded
       by getdents(2).

       readdir() reads one dirent structure from the directory pointed  at  by
       fd  into  the  memory  area pointed to by dirp.  The parameter count is
       ignored; at most one dirent structure is read.

       The dirent structure is declared as follows:

              struct dirent
                  long d_ino;                 /* inode number */
                  off_t d_off;                /* offset to this dirent */
                  unsigned short d_reclen;    /* length of this d_name */
                  char d_name [NAME_MAX+1];   /* file name (null-terminated) */

       d_ino is an inode number.  d_off is the distance from the start of  the
       directory to this dirent.  d_reclen is the size of d_name, not counting
       the null terminator.  d_name is a null-terminated file name.


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


       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.


       getdents(2), readdir(3)