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