opendir3
Open a directory
Usage
#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
Library
Standard C library (libc, -lc)
Overview
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.
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.
Errors
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. |
ENAMETOOLONG
|
name was too long. |
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. |
Attributes
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| opendir(), fdopendir() | Thread safety | MT-Safe |
Notes
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.
Releases
19 releases since Debian 1.1 (Buzz); the text changed 14 times.