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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 #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 *cooki
e), 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 smal
l 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 |
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