145 lines
5.3 KiB
C
145 lines
5.3 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _INCLUDE_SYS__SYSTEM_PROPERTIES_H
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#define _INCLUDE_SYS__SYSTEM_PROPERTIES_H
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#include <sys/cdefs.h>
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#include <stdint.h>
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#ifndef _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
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#error you should #include <sys/system_properties.h> instead
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#endif
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// #include <sys/system_properties.h>
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#include "system_properties.h"
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__BEGIN_DECLS
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#define PROP_SERVICE_NAME "property_service"
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#define PROP_FILENAME "/dev/__properties__"
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#define PROP_MSG_SETPROP 1
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#define PROP_MSG_SETPROP2 0x00020001
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#define PROP_SUCCESS 0
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#define PROP_ERROR_READ_CMD 0x0004
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#define PROP_ERROR_READ_DATA 0x0008
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#define PROP_ERROR_READ_ONLY_PROPERTY 0x000B
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#define PROP_ERROR_INVALID_NAME 0x0010
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#define PROP_ERROR_INVALID_VALUE 0x0014
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#define PROP_ERROR_PERMISSION_DENIED 0x0018
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#define PROP_ERROR_INVALID_CMD 0x001B
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#define PROP_ERROR_HANDLE_CONTROL_MESSAGE 0x0020
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#define PROP_ERROR_SET_FAILED 0x0024
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/*
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** Map the property area from the specified filename. This
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** method is for testing only.
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*/
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int __system_property_set_filename(const char *filename);
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/*
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** Initialize the area to be used to store properties. Can
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** only be done by a single process that has write access to
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** the property area.
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*/
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int __system_property_area_init();
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/* Read the global serial number of the system properties
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**
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** Called to predict if a series of cached __system_property_find
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** objects will have seen __system_property_serial values change.
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** But also aids the converse, as changes in the global serial can
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** also be used to predict if a failed __system_property_find
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** could in-turn now find a new object; thus preventing the
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** cycles of effort to poll __system_property_find.
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**
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** Typically called at beginning of a cache cycle to signal if _any_ possible
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** changes have occurred since last. If there is, one may check each individual
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** __system_property_serial to confirm dirty, or __system_property_find
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** to check if the property now exists. If a call to __system_property_add
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** or __system_property_update has completed between two calls to
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** __system_property_area_serial then the second call will return a larger
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** value than the first call. Beware of race conditions as changes to the
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** properties are not atomic, the main value of this call is to determine
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** whether the expensive __system_property_find is worth retrying to see if
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** a property now exists.
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**
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** Returns the serial number on success, -1 on error.
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*/
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uint32_t __system_property_area_serial();
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/* Add a new system property. Can only be done by a single
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** process that has write access to the property area, and
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** that process must handle sequencing to ensure the property
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** does not already exist and that only one property is added
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** or updated at a time.
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**
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** Returns 0 on success, -1 if the property area is full.
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*/
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int __system_property_add(const char *name, unsigned int namelen, const char *value, unsigned int valuelen);
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/* Delete a new system property. Added in resetprop
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**
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** Returns 0 on success, -1 if the property area is full.
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*/
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int __system_property_del(const char *name);
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/* Update the value of a system property returned by
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** __system_property_find. Can only be done by a single process
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** that has write access to the property area, and that process
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** must handle sequencing to ensure that only one property is
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** updated at a time.
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**
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** Returns 0 on success, -1 if the parameters are incorrect.
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*/
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int __system_property_update(prop_info *pi, const char *value, unsigned int len);
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/* Read the serial number of a system property returned by
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** __system_property_find.
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**
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** Returns the serial number on success, -1 on error.
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*/
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uint32_t __system_property_serial(const prop_info* pi);
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/* Initialize the system properties area in read only mode.
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* Should be done by all processes that need to read system
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* properties.
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*
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* Returns 0 on success, -1 otherwise.
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*/
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int __system_properties_init();
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/* Deprecated: use __system_property_wait instead. */
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uint32_t __system_property_wait_any(uint32_t old_serial);
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__END_DECLS
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#endif
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