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DIRFD(3)		   Linux Programmer's Manual		      DIRFD(3)

       dirfd - get directory stream file descriptor

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

       int dirfd(DIR *dirp);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       dirfd(): _BSD_SOURCE || _SVID_SOURCE

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

       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.

       On  success,  a non-negative file descriptor is returned.  On error, -1
       is returned.

       POSIX.1-2008 specifies two errors, neither of which is returned by  the
       current implementation.

       EINVAL dirp does not refer to a valid directory stream.

	      The  implementation  does	 not support the association of a file
	      descriptor with a directory.

       POSIX.1-2008.  This function was a BSD extension,  present  in  4.3BSD-
       Reno, not in 4.2BSD.

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

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

       This  page  is  part of release 3.22 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				  2008-08-21			      DIRFD(3)

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