DIRFD(3) Linux Programmer's Manual DIRFD(3)
NAME
dirfd - get directory stream file(1,n) descriptor
SYNOPSIS
#include <sys/types.h>
#include <dirent.h>
int dirfd(DIR *dir);
DESCRIPTION
The function dirfd() returns the file(1,n) 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(1,n) position, such as fstat(2) and fchdir(2). It will be
automatically closed when closedir(3) is called.
ERRORS
On error(8,n) -1 is returned.
NOTES
The prototype for dirfd is only available if(3,n) _BSD_SOURCE or
_SVID_SOURCE is defined (either explicitly, or implicitly, by not
defining _POSIX_SOURCE or compiling with the -ansi flag).
CONFORMING TO
This is a BSD extension, present in(1,8) 4.3BSD-Reno, not in(1,8) 4.2BSD.
Present in(1,8) libc5 (since 5.1.2) and in(1,8) glibc2.
SEE ALSO
open(2,3,n)(2), closedir(3), opendir(3), readdir(2,3)(3), rewinddir(3), scandir(3),
seekdir(3), telldir(3)
Linux 2.5 2002-01-05 DIRFD(3)