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():
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, a nonnegative file descriptor is returned. 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.
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), closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3), seekdir(3), telldir(3)
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2016-03-15 | Linux |