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      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
     21 extern "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 */
     41 int property_get(const char *key, char *value, const char *default_value);
     42 
     43 /* property_set: returns 0 on success, < 0 on failure
     44 */
     45 int property_set(const char *key, const char *value);
     46 
     47 int 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 
     57 enum {
     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