Home | History | Annotate | Download | only in liblog 
      1 /*
      2  * Copyright (C) 2016 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 _LIBLOG_PORTABILITY_H__
     18 #define _LIBLOG_PORTABILITY_H__
     19 
     20 #include <sys/cdefs.h>
     21 #include <unistd.h>
     22 
     23 /* Helpful private sys/cdefs.h like definitions */
     24 
     25 /* Declare this library function hidden and internal */
     26 #if defined(_WIN32)
     27 #define LIBLOG_HIDDEN
     28 #else
     29 #define LIBLOG_HIDDEN __attribute__((visibility("hidden")))
     30 #endif
     31 
     32 /* Declare this library function visible and external */
     33 #if defined(_WIN32)
     34 #define LIBLOG_ABI_PUBLIC
     35 #else
     36 #define LIBLOG_ABI_PUBLIC __attribute__((visibility("default")))
     37 #endif
     38 
     39 /* Declare this library function visible but private */
     40 #define LIBLOG_ABI_PRIVATE LIBLOG_ABI_PUBLIC
     41 
     42 /*
     43  * Declare this library function as reimplementation.
     44  * Prevent circular dependencies, but allow _real_ library to hijack
     45  */
     46 #if defined(_WIN32)
     47 #define LIBLOG_WEAK static /* Accept that it is totally private */
     48 #else
     49 #define LIBLOG_WEAK __attribute__((weak, visibility("default")))
     50 #endif
     51 
     52 /* possible missing definitions in sys/cdefs.h */
     53 
     54 /* DECLS */
     55 #ifndef __BEGIN_DECLS
     56 #if defined(__cplusplus)
     57 #define __BEGIN_DECLS extern "C" {
     58 #define __END_DECLS }
     59 #else
     60 #define __BEGIN_DECLS
     61 #define __END_DECLS
     62 #endif
     63 #endif
     64 
     65 /* Unused argument. For C code only, remove symbol name for C++ */
     66 #ifndef __unused
     67 #define __unused __attribute__((__unused__))
     68 #endif
     69 
     70 /* possible missing definitions in unistd.h */
     71 
     72 #ifndef TEMP_FAILURE_RETRY
     73 /* Used to retry syscalls that can return EINTR. */
     74 #define TEMP_FAILURE_RETRY(exp)            \
     75   ({                                       \
     76     __typeof__(exp) _rc;                   \
     77     do {                                   \
     78       _rc = (exp);                         \
     79     } while (_rc == -1 && errno == EINTR); \
     80     _rc;                                   \
     81   })
     82 #endif
     83 
     84 #endif /* _LIBLOG_PORTABILITY_H__ */
     85