Manpage of DIRFD

DIRFD

Section: Linux Programmer's Manual (3)
Updated: 2016-03-15
Index
 

NAME

dirfd - get directory stream file descriptor  

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 versions <= 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, a nonnegative file descriptor is returned. On error, -1 is returned, and errnois 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
dirpdoes 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).
InterfaceAttributeValue
dirfd() Thread safetyMT-Safe
 

CONFORMING TO

POSIX.1-2008. This function was a BSD extension, present in 4.3BSD-Reno, not in 4.2BSD.  

SEE ALSO

open(2), closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3), seekdir(3), telldir(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
CONFORMING TO
SEE ALSO

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Time: 22:27:51 GMT, June 20, 2016