1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
30#include <sys/_system_properties.h>
31
32#include <system_properties/prop_area.h>
33#include <system_properties/system_properties.h>
34
35#include "private/bionic_defs.h"
36
37static SystemProperties system_properties;
38static_assert(__is_trivially_constructible(SystemProperties),
39              "System Properties must be trivially constructable");
40
41// This is public because it was exposed in the NDK. As of 2017-01, ~60 apps reference this symbol.
42// It is set to nullptr and never modified.
43__BIONIC_WEAK_VARIABLE_FOR_NATIVE_BRIDGE
44prop_area* __system_property_area__ = nullptr;
45
46__BIONIC_WEAK_FOR_NATIVE_BRIDGE
47int __system_properties_init() {
48  return system_properties.Init(PROP_FILENAME) ? 0 : -1;
49}
50
51// This was previously for testing, but now that SystemProperties is its own testable class,
52// there is never a reason to call this function.
53__BIONIC_WEAK_FOR_NATIVE_BRIDGE
54int __system_property_set_filename(const char*) {
55  return -1;
56}
57
58__BIONIC_WEAK_FOR_NATIVE_BRIDGE
59int __system_property_area_init() {
60  bool fsetxattr_failed = false;
61  return system_properties.AreaInit(PROP_FILENAME, &fsetxattr_failed) && !fsetxattr_failed ? 0 : -1;
62}
63
64__BIONIC_WEAK_FOR_NATIVE_BRIDGE
65uint32_t __system_property_area_serial() {
66  return system_properties.AreaSerial();
67}
68
69__BIONIC_WEAK_FOR_NATIVE_BRIDGE
70const prop_info* __system_property_find(const char* name) {
71  return system_properties.Find(name);
72}
73
74__BIONIC_WEAK_FOR_NATIVE_BRIDGE
75int __system_property_read(const prop_info* pi, char* name, char* value) {
76  return system_properties.Read(pi, name, value);
77}
78
79__BIONIC_WEAK_FOR_NATIVE_BRIDGE
80void __system_property_read_callback(const prop_info* pi,
81                                     void (*callback)(void* cookie, const char* name,
82                                                      const char* value, uint32_t serial),
83                                     void* cookie) {
84  return system_properties.ReadCallback(pi, callback, cookie);
85}
86
87__BIONIC_WEAK_FOR_NATIVE_BRIDGE
88int __system_property_get(const char* name, char* value) {
89  return system_properties.Get(name, value);
90}
91
92__BIONIC_WEAK_FOR_NATIVE_BRIDGE
93int __system_property_update(prop_info* pi, const char* value, unsigned int len) {
94  return system_properties.Update(pi, value, len);
95}
96
97__BIONIC_WEAK_FOR_NATIVE_BRIDGE
98int __system_property_add(const char* name, unsigned int namelen, const char* value,
99                          unsigned int valuelen) {
100  return system_properties.Add(name, namelen, value, valuelen);
101}
102
103__BIONIC_WEAK_FOR_NATIVE_BRIDGE
104uint32_t __system_property_serial(const prop_info* pi) {
105  return system_properties.Serial(pi);
106}
107
108__BIONIC_WEAK_FOR_NATIVE_BRIDGE
109uint32_t __system_property_wait_any(uint32_t old_serial) {
110  return system_properties.WaitAny(old_serial);
111}
112
113__BIONIC_WEAK_FOR_NATIVE_BRIDGE
114bool __system_property_wait(const prop_info* pi, uint32_t old_serial, uint32_t* new_serial_ptr,
115                            const timespec* relative_timeout) {
116  return system_properties.Wait(pi, old_serial, new_serial_ptr, relative_timeout);
117}
118
119__BIONIC_WEAK_FOR_NATIVE_BRIDGE
120const prop_info* __system_property_find_nth(unsigned n) {
121  return system_properties.FindNth(n);
122}
123
124__BIONIC_WEAK_FOR_NATIVE_BRIDGE
125int __system_property_foreach(void (*propfn)(const prop_info* pi, void* cookie), void* cookie) {
126  return system_properties.Foreach(propfn, cookie);
127}
128