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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #ifndef __DLFCN_H__
     30 #define __DLFCN_H__
     31 
     32 #include <stdint.h>
     33 #include <sys/cdefs.h>
     34 
     35 __BEGIN_DECLS
     36 
     37 #if defined(__clang__)
     38 #pragma clang diagnostic push
     39 #pragma clang diagnostic ignored "-Wnullability-completeness"
     40 #endif
     41 
     42 typedef struct {
     43   /* Pathname of shared object that contains address. */
     44   const char* dli_fname;
     45   /* Address at which shared object is loaded. */
     46   void* dli_fbase;
     47   /* Name of nearest symbol with address lower than addr. */
     48   const char* dli_sname;
     49   /* Exact address of symbol named in dli_sname. */
     50   void* dli_saddr;
     51 } Dl_info;
     52 
     53 void* dlopen(const char* filename, int flag);
     54 int dlclose(void* _Nonnull handle);
     55 char* dlerror(void);
     56 void* dlsym(void* handle, const char* _Nonnull symbol);
     57 void* dlvsym(void* handle, const char* _Nonnull symbol, const char* _Nonnull version) __INTRODUCED_IN(24);
     58 int dladdr(const void* addr, Dl_info* _Nonnull info);
     59 
     60 enum {
     61 #if defined(__LP64__)
     62   RTLD_NOW  = 2,
     63 #else
     64   RTLD_NOW  = 0,
     65 #endif
     66   RTLD_LAZY = 1,
     67 
     68   RTLD_LOCAL  = 0,
     69 #if defined(__LP64__)
     70   RTLD_GLOBAL = 0x00100,
     71 #else
     72   RTLD_GLOBAL = 2,
     73 #endif
     74   RTLD_NOLOAD = 4,
     75   RTLD_NODELETE = 0x01000,
     76 };
     77 
     78 #if defined (__LP64__)
     79 #define RTLD_DEFAULT  __BIONIC_CAST(reinterpret_cast, void*, 0)
     80 #define RTLD_NEXT     __BIONIC_CAST(reinterpret_cast, void*, -1L)
     81 #else
     82 #define RTLD_DEFAULT  __BIONIC_CAST(reinterpret_cast, void*, 0xffffffff)
     83 #define RTLD_NEXT     __BIONIC_CAST(reinterpret_cast, void*, 0xfffffffe)
     84 #endif
     85 
     86 #if defined(__clang__)
     87 #pragma clang diagnostic pop
     88 #endif
     89 
     90 __END_DECLS
     91 
     92 #endif /* __DLFCN_H */
     93