/usr/include/smbios_c/obj/cmos.h is in libsmbios-dev 2.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* Copyright (C) 2005 Dell Inc.
* by Michael Brown <Michael_E_Brown@dell.com>
* Licensed under the Open Software License version 2.1
*
* Alternatively, you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License,
* or (at your option) any later version.
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*/
#ifndef C_OBJ_CMOS_H
#define C_OBJ_CMOS_H
// include smbios_c/compat.h first
#include "smbios_c/compat.h"
#include "smbios_c/types.h"
EXTERN_C_BEGIN;
#define CMOS_DEFAULTS 0x0000
#define CMOS_GET_SINGLETON 0x0001
#define CMOS_GET_NEW 0x0002
#define CMOS_UNIT_TEST_MODE 0x0004
#define CMOS_NO_ERR_CLEAR 0x0008
// forward declaration to reduce header file deps
struct cmos_access_obj;
LIBSMBIOS_C_DLL_SPEC struct cmos_access_obj *cmos_obj_factory(int flags, ...);
LIBSMBIOS_C_DLL_SPEC void cmos_obj_free(struct cmos_access_obj *);
LIBSMBIOS_C_DLL_SPEC int cmos_obj_read_byte(const struct cmos_access_obj *, u8 *byte, u32 indexPort, u32 dataPort, u32 offset);
LIBSMBIOS_C_DLL_SPEC int cmos_obj_write_byte(const struct cmos_access_obj *, u8 byte, u32 indexPort, u32 dataPort, u32 offset);
// format error string
LIBSMBIOS_C_DLL_SPEC const char *cmos_obj_strerror(const struct cmos_access_obj *m);
// useful for checksums, etc
typedef int (*cmos_write_callback)(const struct cmos_access_obj *, bool, void *);
LIBSMBIOS_C_DLL_SPEC void cmos_obj_register_write_callback(struct cmos_access_obj *, cmos_write_callback, void *, void (*destruct)(void *));
LIBSMBIOS_C_DLL_SPEC int cmos_obj_run_callbacks(const struct cmos_access_obj *m, bool do_update);
EXTERN_C_END;
#endif /* CMOS_H */
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