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99 lines
2.3 KiB
C++
99 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "SystemProperty.h"
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#include <dlfcn.h>
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#include <string.h>
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#include "nsDebug.h"
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#include "prinit.h"
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namespace mozilla {
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namespace system {
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namespace {
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typedef int (*PropertyGet)(const char*, char*, const char*);
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typedef int (*PropertySet)(const char*, const char*);
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static void *sLibcUtils;
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static PRCallOnceType sInitLibcUtils;
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static int
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FakePropertyGet(const char* key, char* value, const char* default_value)
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{
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if(!default_value) {
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value[0] = '\0';
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return 0;
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}
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int len = strlen(default_value);
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if (len >= Property::VALUE_MAX_LENGTH) {
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len = Property::VALUE_MAX_LENGTH - 1;
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}
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memcpy(value, default_value, len);
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value[len] = '\0';
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return len;
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}
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static int
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FakePropertySet(const char* key, const char* value)
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{
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return 0;
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}
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static PRStatus
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InitLibcUtils()
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{
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sLibcUtils = dlopen("/system/lib/libcutils.so", RTLD_LAZY);
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// We will fallback to the fake getter/setter when sLibcUtils is not valid.
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return PR_SUCCESS;
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}
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static void*
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GetLibcUtils()
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{
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PR_CallOnce(&sInitLibcUtils, InitLibcUtils);
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return sLibcUtils;
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}
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} // anonymous namespace
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/*static*/ int
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Property::Get(const char* key, char* value, const char* default_value)
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{
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void *libcutils = GetLibcUtils();
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if (libcutils) {
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PropertyGet getter = (PropertyGet) dlsym(libcutils, "property_get");
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if (getter) {
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return getter(key, value, default_value);
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}
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NS_WARNING("Failed to get property_get() from libcutils!");
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}
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NS_WARNING("Fallback to the FakePropertyGet()");
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return FakePropertyGet(key, value, default_value);
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}
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/*static*/ int
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Property::Set(const char* key, const char* value)
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{
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void *libcutils = GetLibcUtils();
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if (libcutils) {
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PropertySet setter = (PropertySet) dlsym(libcutils, "property_set");
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if (setter) {
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return setter(key, value);
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}
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NS_WARNING("Failed to get property_set() from libcutils!");
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}
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NS_WARNING("Fallback to the FakePropertySet()");
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return FakePropertySet(key, value);
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}
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} // namespace system
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} // namespace mozilla
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