opendir, fdopendir - open a directory
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
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
fd is not a valid file descriptor opened for reading.
The per-process limit on the number of open file descriptors has been reached.
The system-wide limit on the total number of open files has been reached.
Directory does not exist, or
name is an empty string.
Insufficient memory to complete the operation.
name is not a directory.
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,
POSIX.1-200x leaves it unspecified whether a successful call to
fdopendir() will set the close-on-exec flag for the
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