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103 lines
3.8 KiB
C
103 lines
3.8 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 <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include "redefs.h"
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__BEGIN_DECLS
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typedef struct prop_info prop_info;
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#define PROP_VALUE_MAX 92
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/*
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* Sets system property `key` to `value`, creating the system property if it doesn't already exist.
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*/
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int __system_property_set(const char *key, const char *value);
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/*
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* Returns a `prop_info` corresponding system property `name`, or nullptr if it doesn't exist.
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* Use __system_property_read_callback to query the current value.
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*
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* Property lookup is expensive, so it can be useful to cache the result of this function.
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*/
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const prop_info* __system_property_find(const char *name);
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/*
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* Calls `callback` with a consistent trio of name, value, and serial number for property `pi`.
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*/
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void __system_property_read_callback(const prop_info *pi,
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void (*callback)(void* cookie, const char *name, const char *value, uint32_t serial),
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void* cookie);
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/*
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* Passes a `prop_info` for each system property to the provided
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* callback. Use __system_property_read_callback() to read the value.
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*
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* This method is for inspecting and debugging the property system, and not generally useful.
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*/
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int __system_property_foreach(void (*propfn)(const prop_info *pi, void *cookie), void *cookie);
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/*
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* Waits for the specific system property identified by `pi` to be updated
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* past `old_serial`. Waits no longer than `relative_timeout`, or forever
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* if `relaive_timeout` is null.
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*
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* If `pi` is null, waits for the global serial number instead.
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*
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* If you don't know the current serial, use 0.
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*
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* Returns true and updates `*new_serial_ptr` on success, or false if the call
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* timed out.
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*/
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struct timespec;
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bool __system_property_wait(const prop_info *pi,
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uint32_t old_serial,
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uint32_t *new_serial_ptr,
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const struct timespec *relative_timeout);
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/* Deprecated. In Android O and above, there's no limit on property name length. */
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#define PROP_NAME_MAX 32
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/* Deprecated. Use __system_property_read_callback instead. */
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int __system_property_read(const prop_info* pi, char* name, char* value);
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/* Deprecated. Use __system_property_read_callback instead. */
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int __system_property_get(const char* name, char* value);
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/* Deprecated. Use __system_property_foreach instead. */
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const prop_info* __system_property_find_nth(unsigned n);
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__END_DECLS
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#endif
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