cgroup_setup_and_join
ctx.fd = cgroup_setup_and_join("/htab_mem");
int cgroup_setup_and_join(const char *relative_path);
cgroup_fd = cgroup_setup_and_join(CGROUP_PATH);
cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
cgroup_fd = cgroup_setup_and_join(cgroup_rel_path);
cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
if (!ASSERT_GE(cgroup_setup_and_join("cgrp_from_id_ns"), 0, "join cgroup"))
cgfd = cgroup_setup_and_join(CG_PATH);
cg_fd = cgroup_setup_and_join(CG_PATH);
cg_fd = cgroup_setup_and_join(cg_path);