66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/*
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* ths.h - Utilities for reading sysctl based temp. and humidity sensors
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* Copyright (C) 2024 Alexander Rosenberg
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*
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* This program is free software: you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version. See the LICENSE file for more information.
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*/
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#ifndef INCLUDED_THS_H
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#define INCLUDED_THS_H
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#include <stdint.h>
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#include <stddef.h>
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#define THS_MIB_BUF_SIZE 8
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typedef struct {
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size_t temp_mib_len;
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int temp_mib[THS_MIB_BUF_SIZE];
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size_t humid_mib_len;
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int humid_mib[THS_MIB_BUF_SIZE];
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size_t fail_mib_len;
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int fail_mib[THS_MIB_BUF_SIZE];
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} THS;
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/*
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* Convert deciKelvin to degrees Celsius
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*/
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#define DK_TO_C(k) ((k) / 10.0f - 273.15f)
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/*
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* Convert deciKelvin to degrees Fahrenheit
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*/
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#define DK_TO_F(k) (((DK_TO_C((k))) * 1.8f) + 32.0f)
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/*
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* Create a new THS from the given sysctl keys. Any of the keys can be null.
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* Return: the new THS, or NULL if an error occurred.
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*/
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THS *ths_open(const char *temp_key, const char *humid_key, const char *fail_key);
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/*
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* Close THS.
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*/
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void ths_close(THS *ths);
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/*
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* Read the fail cound of THS.
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* Return: the value read, or -1 on error
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*/
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int32_t ths_read_fails(const THS *ths);
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/*
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* Read the temperature of THS in deciKelvin.
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* Return: the value read, or -1 on error
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*/
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int32_t ths_read_temp(const THS *ths);
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/*
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* Read the relative humidity of THS as an integer percentage.
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* Return: the value read, or -1 on error
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*/
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int32_t ths_read_humid(const THS *ths);
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#endif
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