Originální popis anglicky:
dirfd - get directory stream file descriptor
Návod, kniha: Linux Programmer's Manual
#include <sys/types.h>
#include <dirent.h>
int dirfd(DIR *dir);
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.
On error -1 is returned.
The prototype for
dirfd is only available if
_BSD_SOURCE or
_SVID_SOURCE is defined (either explicitly, or implicitly, by not
defining _POSIX_SOURCE or compiling with the -ansi flag).
This is a BSD extension, present in 4.3BSD-Reno, not in 4.2BSD. Present in libc5
(since 5.1.2) and in glibc2.
open(2),
closedir(3),
opendir(3),
readdir(3),
rewinddir(3),
scandir(3),
seekdir(3),
telldir(3)
