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OPENDIR(3) Linux Programmer's Manual OPENDIR(3)
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:
_XOPEN_SOURCE >= 700 || _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 Too many file descriptors in use by process.
ENFILE Too many files are currently open in the system.
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.
opendir() is present on SVr4, 4.3BSD, and specified in POSIX.1-2001.
fdopendir() is specified in POSIX.1-2008.
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)
This page is part of release 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
GNU 2010-06-20 OPENDIR(3)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface