открыть каталог (open a directory)
Имя (Name)
opendir, fdopendir - open a directory
Синопсис (Synopsis)
#include <sys/types.h>
#include <dirent.h>
DIR *opendir(const char *name);
DIR *fdopendir(int fd);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
fdopendir():
Since glibc 2.10:
_POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
_GNU_SOURCE
Описание (Description)
The opendir() function opens a directory stream corresponding to
the directory name, and returns a pointer to the directory
stream. The stream is positioned at the first entry in the
directory.
The fdopendir() function is like opendir(), but returns a
directory stream for the directory referred to by the open file
descriptor fd. After a successful call to fdopendir(), fd is
used internally by the implementation, and should not otherwise
be used by the application.
Возвращаемое значение (Return value)
The opendir() and fdopendir() functions return a pointer to the
directory stream. On error, NULL is returned, and errno is set
to indicate the error.
Ошибки (Error)
EACCES Permission denied.
EBADF fd is not a valid file descriptor opened for reading.
EMFILE The per-process limit on the number of open file
descriptors has been reached.
ENFILE The system-wide limit on the total number of open files
has been reached.
ENOENT Directory does not exist, or name is an empty string.
ENOMEM Insufficient memory to complete the operation.
ENOTDIR
name is not a directory.
Версии (Versions)
fdopendir() is available in glibc since version 2.4.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│opendir(), fdopendir() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
opendir() is present on SVr4, 4.3BSD, and specified in
POSIX.1-2001. fdopendir() is specified in POSIX.1-2008.
Примечание (Note)
Filename entries can be read from a directory stream using
readdir(3).
The underlying file descriptor of the directory stream can be
obtained using dirfd(3).
The opendir() function sets the close-on-exec flag for the file
descriptor underlying the DIR *. The fdopendir() function leaves
the setting of the close-on-exec flag unchanged for the file
descriptor, fd. POSIX.1-200x leaves it unspecified whether a
successful call to fdopendir() will set the close-on-exec flag
for the file descriptor, fd.
Смотри также (See also)
open(2), closedir(3), dirfd(3), readdir(3), rewinddir(3),
scandir(3), seekdir(3), telldir(3)
