OPENDIR(3) Linux Programmers Manual OPENDIR(3)
opendir, fdopendir - open a directory
DIR *opendir(const char *name);
DIR *fdopendir(int fd);
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() is like opendir(), but returns a directory stream for
the directory referred to by the open file descriptor fd. After a suc
cessful call to fdopendir(), fd is used internally by the implementa
tion, 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.
fdopendir() is available in glibc since version 2.4.
opendir() is present on SVr4, 4.3BSD, and specified in POSIX.1-2001.
fdopendir() is under consideration for inclusion in the next version of
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,
open(2), closedir(3), dirfd(3), readdir(3), rewinddir(3), scandir(3),
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