cg_read_strcmp_wait
extern int cg_read_strcmp_wait(const char *cgroup, const char *control,
if (cg_read_strcmp_wait(cg_test_d, "cgroup.events",
cg_read_strcmp_wait(cgroup[0], "cgroup.events",
cg_read_strcmp_wait(cgroup, "cgroup.events", "populated 0\n"))
cg_read_strcmp_wait(cgroup, "cgroup.events", "populated 0\n"))