create_and_get_cgroup
cg1 = create_and_get_cgroup(cg_dir);
cg_fd = create_and_get_cgroup(path);
int create_and_get_cgroup(const char *relative_path);
child_cgroup_fd = create_and_get_cgroup(CHILD_CGROUP);
cg = create_and_get_cgroup("/cg_autodetach");
cg2 = create_and_get_cgroup("/cg1/cg2");
cg3 = create_and_get_cgroup("/cg1/cg2/cg3");
cg4 = create_and_get_cgroup("/cg1/cg2/cg3/cg4");
cg5 = create_and_get_cgroup("/cg1/cg2/cg3/cg4/cg5");
cg1 = create_and_get_cgroup("/cg1");
fd = create_and_get_cgroup(cgroups[i].path);
cgrp_fd = create_and_get_cgroup(cgrp_name);
fd = create_and_get_cgroup(cg_path[i]);
cgs[i].fd = create_and_get_cgroup(cgs[i].path);
cgroup_fd = create_and_get_cgroup(CGROUP_TCP_SKB_PATH);
fd = create_and_get_cgroup(cgrp_path);
cg_fd = create_and_get_cgroup(cgrp_path);
cgs[i].fd = create_and_get_cgroup(cgs[i].path);
cgroup = create_and_get_cgroup("/cg_percpu");
fd = create_and_get_cgroup(path);