gfs_mkdir() attempts to create a directory named gfarm_url.
mode speficies the permissions to use.
It is modified by the process's umask
in the usual
way: the permissions of the created file are
(mode &
~umask).
NULL
The function terminated successfully.
GFARM_ERR_NO_MEMORY
Insufficient memory was available.
GFARM_ERR_ALREADY_EXISTS
gfarm_url already exists (not necessarily as a directory). This includes the case where gfarm_url is a symbolic link, dangling or not.
GFARM_ERR_NO_SUCH_OBJECT
The parent directory of gfarm_url does not exist.
GFARM_ERR_NOT_A_DIRECTORY
A component of the path prefix is not a directory.
An error except the above occurred. The reason is shown by its pointed strings.