Name
opendir, fdopendir — open a directory
Synopsis
#include <sys/types.h> #include <dirent.h>
DIR
*opendir( |
const char *name); |
DIR
*fdopendir( |
int fd); |
![[Note]](../stylesheet/note.png) |
Note | |||||
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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
-
fdis 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
nameis an empty string. - ENOMEM
-
Insufficient memory to complete the operation.
- ENOTDIR
-
nameis 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 |
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.
SEE ALSO
open(2), closedir(3), dirfd(3), readdir(3), rewinddir(3), scandir(3), seekdir(3), telldir(3)
COLOPHON
This page is part of release 4.07 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
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Copyright (C) 1993 David Metcalfe (davidprism.demon.co.uk) %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END References consulted: Linux libc source code Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) 386BSD man pages Modified Sat Jul 24 18:46:01 1993 by Rik Faith (faithcs.unc.edu) Modified 11 June 1995 by Andries Brouwer (aebcwi.nl) 2007-07-30 Ulrich Drepper <drepperredhat.com>: document fdopendir(). |