dirfd (3)
Leading comments
Copyright (C) 2002 Andries Brouwer (aeb@cwi.nl) %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the L...
NAME
dirfd - get directory stream file descriptorSYNOPSIS
#include <sys/types.h>#include <dirent.h>
int dirfd(DIR *dirp);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
dirfd():
-
_BSD_SOURCE || _SVID_SOURCE
|| /* Since glibc 2.10: */- (_POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700)
DESCRIPTION
The function dirfd() returns the file descriptor associated with the directory stream dirp.This 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, a nonnegative file descriptor is returned. On error, -1 is returned, and errno is set to indicate the cause of 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 |