GNU
2017-09-15
Aliases: fdopendir(3), fdopendir(3), fdopendir(3), fdopendir(3), fdopendir(3), fdopendir(3), fdopendir(3), fdopendir(3)
manpages-dev
Manual pages about using GNU/Linux for development
man-pages
Linux kernel and C library user-space interface documentation
NAME
opendir, fdopendir - open a directory
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 | |
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.
RETURN VALUE
The opendir() and fdopendir() functions return a pointer to the directory stream. On error, NULL is returned, and errno is set appropriately.
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. |
| 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. | |
VERSIONS
fdopendir() is available in glibc since version 2.4.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| Thread safety | MT-Safe |
CONFORMING TO
opendir() is present on SVr4, 4.3BSD, and specified in POSIX.1-2001. fdopendir() is specified in POSIX.1-2008.
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.
