opendir, fdopendir - open a directory
#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
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.
The
opendir() and
fdopendir() functions return a pointer to the
directory stream. On error, NULL is returned, and
errno is set
appropriately.
- 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.
fdopendir() is available in glibc since version 2.4.
For an explanation of the terms used in this section, see
attributes(7).
Interface |
Attribute |
Value |
opendir (), fdopendir () |
Thread safety |
MT-Safe |
opendir() is present on SVr4, 4.3BSD, and specified in POSIX.1-2001.
fdopendir() is specified in POSIX.1-2008.
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.
open(2),
closedir(3),
dirfd(3),
readdir(3),
rewinddir(3),
scandir(3),
seekdir(3),
telldir(3)