OPENDIR(3) Linux Programmer's Manual OPENDIR(3)NAME
opendir, fdopendir - open a directory
DIR *opendir(const char *name);
DIR *fdopendir(int fd);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.10:
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
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 direc‐
tory stream. On error, NULL is returned, and errno is set appropri‐
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.
name is not a directory.
VERSIONSfdopendir() is available in glibc since version 2.4.
CONFORMING TOopendir() 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
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,
SEE ALSOopen(2), closedir(3), dirfd(3), readdir(3), rewinddir(3), scandir(3),
This page is part of release 3.65 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)