The gfs_opendir() function opens a directory stream
corresponding to the directory gfarm_url, and returns the
directory stream to the address pointed by dirp. The stream is
positioned at the first entry in the directory.
The function terminated successfully.
Insufficient memory was available.
User authentication failed when connecting to gfmd(8).
points outside your accessible address space.
Directory does not exist.
An error except the above occurred. The reason is shown by its