gfs_opendir - open a directory
char *gfs_opendir (const char * gfarm_url, GFS_Dir * dirp);
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.
NULL The function terminated successfully.
Insufficient memory was available.
User authentication failed when connecting to gfmd(8).
gfarm_url points outside your accessible address space.
Directory does not exist.
Others An error except the above occurred. The reason is shown by its