gfs_stat - get file status
char *gfs_stat (const char * gfarm_url, struct gfs_stat * status);
gfs_stat() return information about the specified file pointed to by
gfarm_url, and fills in the buffer pointed to by status. Since status
includes a pointer to dynamically allocated memory space, it is
necessary to free the memory space by gfs_stat_free(3).
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.
gfarm_url does not exist.
A component of the path prefix is not a directory.
Others An error except the above occurred. The reason is shown by its