cgroup-util: add ManagedOOMPreference enum to use between pid1 and oomd

src/basic/cgroup-util.c

@@ -2185,3 +2185,11 @@ static const char* const managed_oom_mode_table[_MANAGED_OOM_MODE_MAX] = {
 };
 
 DEFINE_STRING_TABLE_LOOKUP(managed_oom_mode, ManagedOOMMode);
+
+static const char* const managed_oom_preference_table[_MANAGED_OOM_PREFERENCE_MAX] = {
+        [MANAGED_OOM_PREFERENCE_NONE] = "none",
+        [MANAGED_OOM_PREFERENCE_AVOID] = "avoid",
+        [MANAGED_OOM_PREFERENCE_OMIT] = "omit",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(managed_oom_preference, ManagedOOMPreference);

src/basic/cgroup-util.h

@@ -288,3 +288,14 @@ typedef enum ManagedOOMMode {
 
 const char* managed_oom_mode_to_string(ManagedOOMMode m) _const_;
 ManagedOOMMode managed_oom_mode_from_string(const char *s) _pure_;
+
+typedef enum ManagedOOMPreference {
+        MANAGED_OOM_PREFERENCE_NONE = 0,
+        MANAGED_OOM_PREFERENCE_AVOID = 1,
+        MANAGED_OOM_PREFERENCE_OMIT = 2,
+        _MANAGED_OOM_PREFERENCE_MAX,
+        _MANAGED_OOM_PREFERENCE_INVALID = -1
+} ManagedOOMPreference;
+
+const char* managed_oom_preference_to_string(ManagedOOMPreference a) _const_;
+ManagedOOMPreference managed_oom_preference_from_string(const char *s) _pure_;

src/test/test-tables.c

@@ -73,6 +73,7 @@ int main(int argc, char **argv) {
         test_table(log_target, LOG_TARGET);
         test_table(mac_address_policy, MAC_ADDRESS_POLICY);
         test_table(managed_oom_mode, MANAGED_OOM_MODE);
+        test_table(managed_oom_preference, MANAGED_OOM_PREFERENCE);
         test_table(manager_state, MANAGER_STATE);
         test_table(manager_timestamp, MANAGER_TIMESTAMP);
         test_table(mount_exec_command, MOUNT_EXEC_COMMAND);