1 /*- 2 * Copyright (c) 1994 3 * The Regents of the University of California. 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #ifndef _DLFCN_H_ 33 #define _DLFCN_H_ 34 35 #include <sys/_types.h> 36 37 /* 38 * Modes and flags for dlopen(). 39 */ 40 #define RTLD_LAZY 1 /* Bind function calls lazily. */ 41 #define RTLD_NOW 2 /* Bind function calls immediately. */ 42 #define RTLD_MODEMASK 0x3 43 #define RTLD_GLOBAL 0x100 /* Make symbols globally available. */ 44 #define RTLD_LOCAL 0 /* Opposite of RTLD_GLOBAL, and the default. */ 45 #define RTLD_TRACE 0x200 /* Trace loaded objects and exit. */ 46 #define RTLD_NODELETE 0x01000 /* Do not remove members. */ 47 #define RTLD_NOLOAD 0x02000 /* Do not load if not already loaded. */ 48 49 /* 50 * Request arguments for dlinfo(). 51 */ 52 #define RTLD_DI_LINKMAP 2 /* Obtain link map. */ 53 #define RTLD_DI_SERINFO 4 /* Obtain search path info. */ 54 #define RTLD_DI_SERINFOSIZE 5 /* ... query for required space. */ 55 #define RTLD_DI_ORIGIN 6 /* Obtain object origin */ 56 #define RTLD_DI_MAX RTLD_DI_ORIGIN 57 58 /* 59 * Special handle arguments for dlsym()/dlinfo(). 60 */ 61 #define RTLD_NEXT ((void *) -1) /* Search subsequent objects. */ 62 #define RTLD_DEFAULT ((void *) -2) /* Use default search algorithm. */ 63 #define RTLD_SELF ((void *) -3) /* Search the caller itself. */ 64 65 #if __BSD_VISIBLE 66 67 #ifndef _SIZE_T_DECLARED 68 typedef __size_t size_t; 69 #define _SIZE_T_DECLARED 70 #endif 71 72 /* 73 * Structure filled in by dladdr(). 74 */ 75 typedef struct dl_info { 76 const char *dli_fname; /* Pathname of shared object. */ 77 void *dli_fbase; /* Base address of shared object. */ 78 const char *dli_sname; /* Name of nearest symbol. */ 79 void *dli_saddr; /* Address of nearest symbol. */ 80 } Dl_info; 81 82 /*- 83 * The actual type declared by this typedef is immaterial, provided that 84 * it is a function pointer. Its purpose is to provide a return type for 85 * dlfunc() which can be cast to a function pointer type without depending 86 * on behavior undefined by the C standard, which might trigger a compiler 87 * diagnostic. We intentionally declare a unique type signature to force 88 * a diagnostic should the application not cast the return value of dlfunc() 89 * appropriately. 90 */ 91 struct __dlfunc_arg { 92 int __dlfunc_dummy; 93 }; 94 95 typedef void (*dlfunc_t)(struct __dlfunc_arg); 96 97 /* 98 * Structures, returned by the RTLD_DI_SERINFO dlinfo() request. 99 */ 100 typedef struct dl_serpath { 101 char * dls_name; /* single search path entry */ 102 unsigned int dls_flags; /* path information */ 103 } Dl_serpath; 104 105 typedef struct dl_serinfo { 106 size_t dls_size; /* total buffer size */ 107 unsigned int dls_cnt; /* number of path entries */ 108 Dl_serpath dls_serpath[1]; /* there may be more than one */ 109 } Dl_serinfo; 110 111 #endif /* __BSD_VISIBLE */ 112 113 __BEGIN_DECLS 114 /* XSI functions first. */ 115 int dlclose(void *); 116 char *dlerror(void); 117 void *dlopen(const char *, int); 118 void *dlsym(void * __restrict, const char * __restrict); 119 120 #if __BSD_VISIBLE 121 int dladdr(const void * __restrict, Dl_info * __restrict); 122 dlfunc_t dlfunc(void * __restrict, const char * __restrict); 123 int dlinfo(void * __restrict, int, void * __restrict); 124 void dllockinit(void *_context, 125 void *(*_lock_create)(void *_context), 126 void (*_rlock_acquire)(void *_lock), 127 void (*_wlock_acquire)(void *_lock), 128 void (*_lock_release)(void *_lock), 129 void (*_lock_destroy)(void *_lock), 130 void (*_context_destroy)(void *_context)); 131 void *dlvsym(void * __restrict, const char * __restrict, 132 const char * __restrict); 133 #endif /* __BSD_VISIBLE */ 134 __END_DECLS 135 136 #endif /* !_DLFCN_H_ */ 137