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guocheng.kgc 2020-06-18 20:06:52 +08:00 • committed by shengdong.dsd
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Living_SDK/include/aos/kv.h Normal file
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/*
* Copyright (C) 2015-2017 Alibaba Group Holding Limited
*/
#ifndef AOS_KV_H
#define AOS_KV_H
#include <aos/types.h>
#ifdef __cplusplus
extern "C"
{
#endif
/**
* Add a new KV pair.
*
* @param[in] key the key of the KV pair.
* @param[in] value the value of the KV pair.
* @param[in] len the length of the value.
* @param[in] sync save the KV pair to flash right now (should always be 1).
*
* @return 0 on success, negative error on failure.
*/
int aos_kv_set(const char *key, const void *value, int len, int sync);
/**
* Get the KV pair's value stored in buffer by its key.
*
* @note: the buffer_len should be larger than the real length of the value,
* otherwise buffer would be NULL.
*
* @param[in] key the key of the KV pair to get.
* @param[out] buffer the memory to store the value.
* @param[in-out] buffer_len in: the length of the input buffer.
* out: the real length of the value.
*
* @return 0 on success, negative error on failure.
*/
int aos_kv_get(const char *key, void *buffer, int *buffer_len);
/**
* Delete the KV pair by its key.
*
* @param[in] key the key of the KV pair to delete.
*
* @return 0 on success, negative error on failure.
*/
int aos_kv_del(const char *key);
/**
* Delete the KV pair by key's prefix.
*
* @param[in] key the key's prefix of the KV pair to delete.
*
* @return 0 on success, negative error on failure.
*/
int aos_kv_del_by_prefix(const char *prefix);
#ifdef __cplusplus
}
#endif
#endif /* AOS_KV_H */