1 .\" Copyright (C) 2002 Andries Brouwer (aeb@cwi.nl)
3 .\" %%%LICENSE_START(VERBATIM)
4 .\" Permission is granted to make and distribute verbatim copies of this
5 .\" manual provided the copyright notice and this permission notice are
6 .\" preserved on all copies.
8 .\" Permission is granted to copy and distribute modified versions of this
9 .\" manual under the conditions for verbatim copying, provided that the
10 .\" entire resulting derived work is distributed under the terms of a
11 .\" permission notice identical to this one.
13 .\" Since the Linux kernel and libraries are constantly changing, this
14 .\" manual page may be incorrect or out-of-date. The author(s) assume no
15 .\" responsibility for errors or omissions, or for damages resulting from
16 .\" the use of the information contained herein. The author(s) may not
17 .\" have taken the same level of care in the production of this manual,
18 .\" which is licensed free of charge, as they might when working
21 .\" Formatted or processed versions of this manual, if unaccompanied by
22 .\" the source, must acknowledge the copyright and authors of this work.
25 .TH DIRFD 3 2016-03-15 "Linux" "Linux Programmer's Manual"
27 dirfd \- get directory stream file descriptor
29 .B #include <sys/types.h>
31 .B #include <dirent.h>
33 .BI "int dirfd(DIR *" dirp );
36 Feature Test Macro Requirements for glibc (see
37 .BR feature_test_macros (7)):
45 /* Since glibc 2.10: */ _POSIX_C_SOURCE\ >=\ 200809L
46 || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
53 returns the file descriptor associated with the directory stream
56 This file descriptor is the one used internally by the directory stream.
57 As a result, it is useful only for functions which do not depend on
58 or alter the file position, such as
62 It will be automatically closed when
66 On success, a nonnegative file descriptor is returned.
67 On error, \-1 is returned, and
69 is set to indicate the cause of the error.
71 POSIX.1-2008 specifies two errors,
72 neither of which is returned by the current
78 does not refer to a valid directory stream.
81 The implementation does not support the association of a file
82 descriptor with a directory.
84 For an explanation of the terms used in this section, see
90 Interface Attribute Value
93 T} Thread safety MT-Safe
97 This function was a BSD extension, present in 4.3BSD-Reno, not in 4.2BSD.
98 .\" It is present in libc5 (since 5.1.2) and in glibc2.