dirfd
Section: C Library Functions (3)
Updated: 2023-02-05
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NAME
dirfd - get directory stream file descriptor
LIBRARY
Standard C library
(libc, -lc)
SYNOPSIS
#include <sys/types.h>
#include <dirent.h>
int dirfd(DIR *dirp);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
dirfd():
/* Since glibc 2.10: */ _POSIX_C_SOURCE >= 200809L
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
DESCRIPTION
The function
dirfd()
returns the file descriptor associated with the directory stream
dirp.
This file descriptor is the one used internally by the directory stream.
As a result, it is useful only 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.
RETURN VALUE
On success,
dirfd()
returns a file descriptor (a nonnegative integer).
On error, -1 is returned, and
errno
is set to indicate the error.
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.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
dirfd()
| Thread safety | MT-Safe
|
STANDARDS
POSIX.1-2008.
This function was a BSD extension, present in 4.3BSD-Reno, not in 4.2BSD.
SEE ALSO
open(2),
openat(2),
closedir(3),
opendir(3),
readdir(3),
rewinddir(3),
scandir(3),
seekdir(3),
telldir(3)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- ATTRIBUTES
-
- STANDARDS
-
- SEE ALSO
-
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Time: 22:22:11 GMT, April 27, 2024