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80 lines
2.5 KiB
JavaScript
80 lines
2.5 KiB
JavaScript
/* 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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const SYSTEM_PROPERTY_KEY_MAX = 32;
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const SYSTEM_PROPERTY_VALUE_MAX = 92;
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/**
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* Expose some system-level functions.
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*/
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let libcutils = (function() {
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let lib;
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try {
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lib = ctypes.open("libcutils.so");
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} catch(ex) {
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// Return a fallback option in case libcutils.so isn't present (e.g.
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// when building Firefox with MOZ_B2G_RIL.
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dump("Could not load libcutils.so. Using fake propdb.");
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let fake_propdb = Object.create(null);
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return {
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property_get: function fake_property_get(key, defaultValue) {
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if (key in fake_propdb) {
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return fake_propdb[key];
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}
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return defaultValue === undefined ? null : defaultValue;
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},
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property_set: function fake_property_set(key, value) {
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fake_propdb[key] = value;
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}
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};
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}
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let c_property_get = lib.declare("property_get", ctypes.default_abi,
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ctypes.int, // return value: length
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ctypes.char.ptr, // key
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ctypes.char.ptr, // value
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ctypes.char.ptr); // default
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let c_property_set = lib.declare("property_set", ctypes.default_abi,
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ctypes.int, // return value: success
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ctypes.char.ptr, // key
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ctypes.char.ptr); // value
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let c_value_buf = ctypes.char.array(SYSTEM_PROPERTY_VALUE_MAX)();
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return {
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/**
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* Get a system property.
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*
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* @param key
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* Name of the property
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* @param defaultValue [optional]
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* Default value to return if the property isn't set (default: null)
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*/
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property_get: function property_get(key, defaultValue) {
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if (defaultValue === undefined) {
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defaultValue = null;
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}
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c_property_get(key, c_value_buf, defaultValue);
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return c_value_buf.readString();
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},
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/**
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* Set a system property
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*
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* @param key
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* Name of the property
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* @param value
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* Value to set the property to.
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*/
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property_set: function property_set(key, value) {
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let rv = c_property_set(key, value);
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if (rv) {
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throw Error('libcutils.property_set("' + key + '", "' + value +
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'") failed with error ' + rv);
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}
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}
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};
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})();
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