DIRFD(3)                   Linux Programmer's Manual                  DIRFD(3)
NAME
       dirfd - get directory stream file descriptor

SYNOPSIS
       #include <sys/types.h>
       #include <dirent.h>

       int dirfd(DIR *dir);

DESCRIPTION
       The  function  dirfd()  returns the file descriptor associated with the
       directory stream dir.

       This descriptor is the one used internally by the directory stream.  As
       a  result,  it  is  only useful for functions which do not depend on or
       alter the file position, such as fstat(2) and fchdir(2).   It  will  be
       automatically closed when closedir(3) is called.

ERRORS
       On error -1 is returned.

NOTES
       The   prototype  for  dirfd()  is  only  available  if  _BSD_SOURCE  or
       _SVID_SOURCE is defined.

CONFORMING TO
       This is a BSD extension, present in 4.3BSD-Reno, not in 4.2BSD.  It  is
       present  in  libc5 (since 5.1.2) and in glibc2.  This function is under
       consideration for inclusion in a future version of POSIX.1.

SEE ALSO
       open(2), closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3),
       seekdir(3), telldir(3)

Linux 2.5                         2002-01-05                          DIRFD(3)