1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef __CUTILS_PROPERTIES_H 18#define __CUTILS_PROPERTIES_H 19 20#ifdef __cplusplus 21extern "C" { 22#endif 23 24/* System properties are *small* name value pairs managed by the 25** property service. If your data doesn't fit in the provided 26** space it is not appropriate for a system property. 27** 28** WARNING: system/bionic/include/sys/system_properties.h also defines 29** these, but with different names. (TODO: fix that) 30*/ 31#define PROPERTY_KEY_MAX 32 32#define PROPERTY_VALUE_MAX 92 33 34/* property_get: returns the length of the value which will never be 35** greater than PROPERTY_VALUE_MAX - 1 and will always be zero terminated. 36** (the length does not include the terminating zero). 37** 38** If the property read fails or returns an empty value, the default 39** value is used (if nonnull). 40*/ 41int property_get(const char *key, char *value, const char *default_value); 42 43/* property_set: returns 0 on success, < 0 on failure 44*/ 45int property_set(const char *key, const char *value); 46 47int property_list(void (*propfn)(const char *key, const char *value, void *cookie), void *cookie); 48 49 50#ifdef HAVE_SYSTEM_PROPERTY_SERVER 51/* 52 * We have an external property server instead of built-in libc support. 53 * Used by the simulator. 54 */ 55#define SYSTEM_PROPERTY_PIPE_NAME "/tmp/android-sysprop" 56 57enum { 58 kSystemPropertyUnknown = 0, 59 kSystemPropertyGet, 60 kSystemPropertySet, 61 kSystemPropertyList 62}; 63#endif /*HAVE_SYSTEM_PROPERTY_SERVER*/ 64 65 66#ifdef __cplusplus 67} 68#endif 69 70#endif 71