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#include <sys/cdefs.h> 21#include <stddef.h> 22#ifdef ANDROID 23#include <sys/system_properties.h> 24#else 25#ifndef PROP_NAME_MAX 26#define PROP_NAME_MAX 32 27#endif 28#ifndef PROP_VALUE_MAX 29#define PROP_VALUE_MAX 92 30#endif 31#endif 32 33#ifdef __cplusplus 34extern "C" { 35#endif 36 37/* System properties are *small* name value pairs managed by the 38** property service. If your data doesn't fit in the provided 39** space it is not appropriate for a system property. 40** 41** WARNING: system/bionic/include/sys/system_properties.h also defines 42** these, but with different names. (TODO: fix that) 43*/ 44#define PROPERTY_KEY_MAX PROP_NAME_MAX 45#define PROPERTY_VALUE_MAX PROP_VALUE_MAX 46 47/* property_get: returns the length of the value which will never be 48** greater than PROPERTY_VALUE_MAX - 1 and will always be zero terminated. 49** (the length does not include the terminating zero). 50** 51** If the property read fails or returns an empty value, the default 52** value is used (if nonnull). 53*/ 54int property_get(const char *key, char *value, const char *default_value); 55 56/* property_set: returns 0 on success, < 0 on failure 57*/ 58int property_set(const char *key, const char *value); 59 60int property_list(void (*propfn)(const char *key, const char *value, void *cookie), void *cookie); 61 62#if defined(__BIONIC_FORTIFY) 63 64extern int __property_get_real(const char *, char *, const char *) 65 __asm__(__USER_LABEL_PREFIX__ "property_get"); 66__errordecl(__property_get_too_small_error, "property_get() called with too small of a buffer"); 67 68__BIONIC_FORTIFY_INLINE 69int property_get(const char *key, char *value, const char *default_value) { 70 size_t bos = __bos(value); 71 if (bos < PROPERTY_VALUE_MAX) { 72 __property_get_too_small_error(); 73 } 74 return __property_get_real(key, value, default_value); 75} 76 77#endif 78 79#ifdef HAVE_SYSTEM_PROPERTY_SERVER 80/* 81 * We have an external property server instead of built-in libc support. 82 * Used by the simulator. 83 */ 84#define SYSTEM_PROPERTY_PIPE_NAME "/tmp/android-sysprop" 85 86enum { 87 kSystemPropertyUnknown = 0, 88 kSystemPropertyGet, 89 kSystemPropertySet, 90 kSystemPropertyList 91}; 92#endif /*HAVE_SYSTEM_PROPERTY_SERVER*/ 93 94 95#ifdef __cplusplus 96} 97#endif 98 99#endif 100