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      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 
     37 static SystemProperties system_properties;
     38 static_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
     44 prop_area* __system_property_area__ = nullptr;
     45 
     46 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     47 int __system_properties_init() {
     48   return system_properties.Init(PROP_FILENAME) ? 0 : -1;
     49 }
     50 
     51 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     52 int __system_property_set_filename(const char*) {
     53   return -1;
     54 }
     55 
     56 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     57 int __system_property_area_init() {
     58   bool fsetxattr_failed = false;
     59   return system_properties.AreaInit(PROP_FILENAME, &fsetxattr_failed) && !fsetxattr_failed ? 0 : -1;
     60 }
     61 
     62 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     63 uint32_t __system_property_area_serial() {
     64   return system_properties.AreaSerial();
     65 }
     66 
     67 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     68 const prop_info* __system_property_find(const char* name) {
     69   return system_properties.Find(name);
     70 }
     71 
     72 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     73 int __system_property_read(const prop_info* pi, char* name, char* value) {
     74   return system_properties.Read(pi, name, value);
     75 }
     76 
     77 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     78 void __system_property_read_callback(const prop_info* pi,
     79                                      void (*callback)(void* cookie, const char* name,
     80                                                       const char* value, uint32_t serial),
     81                                      void* cookie) {
     82   return system_properties.ReadCallback(pi, callback, cookie);
     83 }
     84 
     85 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     86 int __system_property_get(const char* name, char* value) {
     87   return system_properties.Get(name, value);
     88 }
     89 
     90 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     91 int __system_property_update(prop_info* pi, const char* value, unsigned int len) {
     92   return system_properties.Update(pi, value, len);
     93 }
     94 
     95 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     96 int __system_property_add(const char* name, unsigned int namelen, const char* value,
     97                           unsigned int valuelen) {
     98   return system_properties.Add(name, namelen, value, valuelen);
     99 }
    100 
    101 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
    102 uint32_t __system_property_serial(const prop_info* pi) {
    103   return system_properties.Serial(pi);
    104 }
    105 
    106 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
    107 uint32_t __system_property_wait_any(uint32_t old_serial) {
    108   return system_properties.WaitAny(old_serial);
    109 }
    110 
    111 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
    112 bool __system_property_wait(const prop_info* pi, uint32_t old_serial, uint32_t* new_serial_ptr,
    113                             const timespec* relative_timeout) {
    114   return system_properties.Wait(pi, old_serial, new_serial_ptr, relative_timeout);
    115 }
    116 
    117 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
    118 const prop_info* __system_property_find_nth(unsigned n) {
    119   return system_properties.FindNth(n);
    120 }
    121 
    122 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
    123 int __system_property_foreach(void (*propfn)(const prop_info* pi, void* cookie), void* cookie) {
    124   return system_properties.Foreach(propfn, cookie);
    125 }
    126