dirfd - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEdirfd − get directory stream file descriptor

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LIBRARYStandard C library (libc, −lc)

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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

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DESCRIPTIONThe 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.

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RETURN VALUEOn success, dirfd() returns a file descriptor (a nonnegative integer). On error, −1 is returned, and errno is set to indicate the error.

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ERRORSPOSIX.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.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue dirfd() Thread safetyMT-Safe

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

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SEE ALSOopen(2), openat(2), closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3), seekdir(3), telldir(3) 0

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