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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 *dirp);

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

       dirfd(): _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION
       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 func-
       tions which do not depend on or alter the file position, such as fstat(2) and fchdir(2).  It will be  automati-
       cally closed when closedir(3) is called.

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

ERRORS
       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.

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

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

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

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

COLOPHON
       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2008-08-21                          DIRFD(3)