OPENDIR(3) Linux Programmer's Manual OPENDIR(3)
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:
_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 The per-process limit on the number of open file descriptors has
ENFILE The system-wide limit on the total number of open files has been
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.
For an explanation of the terms used in this section, see
|Interface | Attribute | Value |
|opendir(), fdopendir() | Thread safety | MT-Safe |
opendir() is present on SVr4, 4.3BSD, and specified in POSIX.1-2001.
fdopendir() is specified in POSIX.1-2008.
Filename entries can be read from a directory stream using readdir(3).
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,
open(2), closedir(3), dirfd(3), readdir(3), rewinddir(3), scandir(3),
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