int
ProcFamily::freezer_cgroup(const char * state)
{
// According to kernel docs, freezer will either succeed
// or return EBUSY in the errno.
//
// This function either returns 0 (success), a positive value (fatal error)
// or -EBUSY.
int err = 0;
struct cgroup_controller* freezer;
struct cgroup *cgroup = cgroup_new_cgroup(m_cgroup_string.c_str());
ASSERT (cgroup != NULL);
if (!m_cm.isMounted(CgroupManager::FREEZE_CONTROLLER)) {
err = 1;
goto ret;
}
freezer = cgroup_add_controller(cgroup, FREEZE_CONTROLLER_STR);
if (NULL == freezer) {
dprintf(D_ALWAYS,
"Unable to access the freezer subsystem for ProcFamily %u "
"for cgroup %s\n",
m_root_pid, m_cgroup_string.c_str());
err = 2;
goto ret;
}
if ((err = cgroup_add_value_string(freezer, "freezer.state", state))) {
dprintf(D_ALWAYS,
"Unable to write %s to freezer for cgroup %s (ProcFamily %u). %u %s\n",
state, m_cgroup_string.c_str(), m_root_pid, err, cgroup_strerror(err));
err = 3;
goto ret;
}
if ((err = cgroup_modify_cgroup(cgroup))) {
if (ECGROUPVALUENOTEXIST == err) {
dprintf(D_ALWAYS,
"Does not appear condor_procd is allowed to freeze"
" cgroup %s (ProcFamily %u).\n",
m_cgroup_string.c_str(), m_root_pid);
} else if ((ECGOTHER == err) && (EBUSY == cgroup_get_last_errno())) {
dprintf(D_ALWAYS, "Kernel was unable to freeze cgroup %s "
"(ProcFamily %u) due to process state; signal delivery "
"won't be atomic\n", m_cgroup_string.c_str(), m_root_pid);
err = -EBUSY;
} else {
dprintf(D_ALWAYS,
"Unable to commit freezer change %s for cgroup %s (ProcFamily %u). %u %s\n",
state, m_cgroup_string.c_str(), m_root_pid, err, cgroup_strerror(err));
}
err = 4;
goto ret;
}
ret:
cgroup_free(&cgroup);
return err;
}
// error handling
static int l_cgroup_strerror (lua_State *L) {
int eint = 0;
const char *out = NULL;
if(lua_isnumber(L, 1))
eint = lua_tointeger(L, 1);
else
eint = cgroup_get_last_errno();
out = cgroup_strerror(eint);
if(out) {
lua_pushstring(L, out);
return 1;
}
return 0;
}
static int l_cgroup_get_last_errno(lua_State *L) {
lua_pushinteger(L, cgroup_get_last_errno());
return 1;
}
