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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 // 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
     54 int __system_property_set_filename(const char*) {
     55   return -1;
     56 }
     57 
     58 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     59 int __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
     65 uint32_t __system_property_area_serial() {
     66   return system_properties.AreaSerial();
     67 }
     68 
     69 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     70 const prop_info* __system_property_find(const char* name) {
     71   return system_properties.Find(name);
     72 }
     73 
     74 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     75 int __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
     80 void __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
     88 int __system_property_get(const char* name, char* value) {
     89   return system_properties.Get(name, value);
     90 }
     91 
     92 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
     93 int __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
     98 int __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
    104 uint32_t __system_property_serial(const prop_info* pi) {
    105   return system_properties.Serial(pi);
    106 }
    107 
    108 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
    109 uint32_t __system_property_wait_any(uint32_t old_serial) {
    110   return system_properties.WaitAny(old_serial);
    111 }
    112 
    113 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
    114 bool __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
    120 const prop_info* __system_property_find_nth(unsigned n) {
    121   return system_properties.FindNth(n);
    122 }
    123 
    124 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
    125 int __system_property_foreach(void (*propfn)(const prop_info* pi, void* cookie), void* cookie) {
    126   return system_properties.Foreach(propfn, cookie);
    127 }
    128