properties.h

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
/* clang-format off */
#ifndef __CUTILS_PROPERTIES_H
#define __CUTILS_PROPERTIES_H
 
#include <sys/cdefs.h>
#include <stddef.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* property_get: returns the length of the value which will never be
** greater than PROP_VALUE_MAX - 1 and will always be zero terminated.
** (the length does not include the terminating zero).
**
** If the property read fails or returns an empty value, the default
** value is used (if nonnull).
*/
int property_get(const char *key, char *value, const char *default_value);
 
/* property_set: returns 0 on success, < 0 on failure
*/
int property_set(const char *key, const char *value);
    
int property_list(void (*propfn)(const char *key, const char *value, void *cookie), void *cookie);
 
int property_init(void);
 
#if defined(__BIONIC_FORTIFY)
 
extern int __property_get_real(const char *, char *, const char *)
    __asm__(__USER_LABEL_PREFIX__ "property_get");
__errordecl(__property_get_too_small_error, "property_get() called with too small of a buffer");
 
__BIONIC_FORTIFY_INLINE
int property_get(const char *key, char *value, const char *default_value) {
    size_t bos = __bos(value);
    if (bos < PROP_VALUE_MAX) {
        __property_get_too_small_error();
    }
    return __property_get_real(key, value, default_value);
}
 
#endif
 
#ifdef HAVE_SYSTEM_PROPERTY_SERVER
/*
 * We have an external property server instead of built-in libc support.
 * Used by the simulator.
 */
#define SYSTEM_PROPERTY_PIPE_NAME       "/tmp/android-sysprop"
 
enum {
    kSystemPropertyUnknown = 0,
    kSystemPropertyGet,
    kSystemPropertySet,
    kSystemPropertyList
};
#endif /*HAVE_SYSTEM_PROPERTY_SERVER*/
 
 
#ifdef __cplusplus
}
#endif
 
#endif
/* clang-format on */