third_party/hwcplus/include/cutils/properties.h

   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
  34 extern "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 */
  54 int property_get(const char *key, char *value, const char *default_value);
  55
  56 /* property_set: returns 0 on success, < 0 on failure
  57 */
  58 int property_set(const char *key, const char *value);
  59
  60 int property_list(void (*propfn)(const char *key, const char *value, void *cookie), void *cookie);
  61
  62 #if defined(__BIONIC_FORTIFY)
  63
  64 extern 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
  69 int 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
  86 enum {
  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