получить дескриптор файла потока каталога (get directory stream file descriptor)
Имя (Name)
dirfd - get directory stream file descriptor
Синопсис (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
Описание (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.
Возвращаемое значение (Return value)
On success, dirfd() returns a file descriptor (a nonnegative
integer). On error, -1 is returned, and errno is set to indicate
the error.
Ошибки (Error)
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.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│dirfd() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
POSIX.1-2008. This function was a BSD extension, present in
4.3BSD-Reno, not in 4.2BSD.
Смотри также (See also)
open(2), openat(2), closedir(3), opendir(3), readdir(3),
rewinddir(3), scandir(3), seekdir(3), telldir(3)
