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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
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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():
/* Since glibc 2.10: */ _POSIX_C_SOURCE >= 200809L
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE ||
_SVID_SOURCE
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.
On success, dirfd() returns a file descriptor (a nonnegative
integer). On error, -1 is returned, and errno is set to indicate
the cause of the error.
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.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────┼───────────────┼─────────┤
│dirfd() │ Thread safety │ MT-Safe │
└──────────┴───────────────┴─────────┘
POSIX.1-2008. This function was a BSD extension, present in
4.3BSD-Reno, not in 4.2BSD.
open(2), openat(2), closedir(3), opendir(3), readdir(3),
rewinddir(3), scandir(3), seekdir(3), telldir(3)
This page is part of release 5.10 of the Linux man-pages project.
A description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
Linux 2020-04-11 DIRFD(3)
Pages that refer to this page: open(2), opendir(3), readdir(3)
Copyright and license for this manual page
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