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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD$ 34 */ 35 36 #ifndef _DLFCN_H_ 37 #define _DLFCN_H_ 38 39 #include <sys/cdefs.h> 40 41 /* 42 * Modes and flags for dlopen(). 43 */ 44 #define RTLD_LAZY 1 /* Bind function calls lazily. */ 45 #define RTLD_NOW 2 /* Bind function calls immediately. */ 46 #define RTLD_MODEMASK 0x3 47 #define RTLD_GLOBAL 0x100 /* Make symbols globally available. */ 48 #define RTLD_LOCAL 0 /* Opposite of RTLD_GLOBAL, and the default. */ 49 #define RTLD_TRACE 0x200 /* Trace loaded objects and exit. */ 50 51 /* 52 * Special handle arguments for dlsym(). 53 */ 54 #define RTLD_NEXT ((void *) -1) /* Search subsequent objects. */ 55 #define RTLD_DEFAULT ((void *) -2) /* Use default search algorithm. */ 56 57 #if __BSD_VISIBLE 58 /* 59 * Structure filled in by dladdr(). 60 */ 61 typedef struct dl_info { 62 const char *dli_fname; /* Pathname of shared object. */ 63 void *dli_fbase; /* Base address of shared object. */ 64 const char *dli_sname; /* Name of nearest symbol. */ 65 void *dli_saddr; /* Address of nearest symbol. */ 66 } Dl_info; 67 68 /*- 69 * The actual type declared by this typedef is immaterial, provided that 70 * it is a function pointer. Its purpose is to provide a return type for 71 * dlfunc() which can be cast to a function pointer type without depending 72 * on behavior undefined by the C standard, which might trigger a compiler 73 * diagnostic. We intentionally declare a unique type signature to force 74 * a diagnostic should the application not cast the return value of dlfunc() 75 * appropriately. 76 */ 77 struct __dlfunc_arg { 78 int __dlfunc_dummy; 79 }; 80 81 typedef void (*dlfunc_t)(struct __dlfunc_arg); 82 83 #endif /* __BSD_VISIBLE */ 84 85 __BEGIN_DECLS 86 /* XSI functions first. */ 87 int dlclose(void *); 88 const char * 89 dlerror(void); 90 void *dlopen(const char *, int); 91 void *dlsym(void * __restrict, const char * __restrict); 92 93 #if __BSD_VISIBLE 94 int dladdr(const void *, Dl_info *); 95 dlfunc_t dlfunc(void * __restrict, const char * __restrict); 96 void dllockinit(void *_context, 97 void *(*_lock_create)(void *_context), 98 void (*_rlock_acquire)(void *_lock), 99 void (*_wlock_acquire)(void *_lock), 100 void (*_lock_release)(void *_lock), 101 void (*_lock_destroy)(void *_lock), 102 void (*_context_destroy)(void *_context)); 103 #endif /* __BSD_VISIBLE */ 104 __END_DECLS 105 106 #endif /* !_DLFCN_H_ */ 107