NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON
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.
ENOTSUP
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 3.23 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)