68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
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/*
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* Copyright 2022 Google, Inc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* This file defines no-op hook functions for LMKD. To override these
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* definitions, enable the use_lmkd_hooks product variable and create a library
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* "liblmkdhooks" that supplies definitions for the hook functions in your
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* vendor folder.
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*/
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#ifndef _LMKD_HOOKS_H_
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#define _LMKD_HOOKS_H_
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#include <sys/types.h>
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__BEGIN_DECLS
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#ifdef LMKD_USE_HOOKS
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/*
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* Initialize all necessary Android props and perform any necessary validation
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* on the values. Called before lmkd_init_hook() and will be called again
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* whenever LMKD receives the LMK_UPDATE_PROPS command. Returns true on success,
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* false otherwise.
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*/
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bool lmkd_update_props_hook();
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/*
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* Perform any necessary initialization for the hooks. Called only once at the
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* end of LMKD's init(). Returns true on success, false otherwise.
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*/
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bool lmkd_init_hook();
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/*
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* Allows for interception of a kill by LMKD. This hook may attempt to free
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* memory elsewhere to avoid the specified process being killed. Returns 0 to
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* proceed with the kill, or the number of memory pages freed elsewhere to skip
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* the kill.
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*/
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int lmkd_free_memory_before_kill_hook(struct proc* procp, int proc_size_pages,
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int proc_oom_score, int kill_reason);
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#else /* LMKD_USE_HOOKS */
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static inline bool lmkd_update_props_hook() { return true; }
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static inline bool lmkd_init_hook() { return true; }
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static inline int lmkd_free_memory_before_kill_hook(struct proc*, int, int,
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int) {
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return 0;
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}
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#endif /* LMKD_USE_HOOKS */
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__END_DECLS
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#endif
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