dlfcn.h revision 103212
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: head/include/dlfcn.h 103212 2002-09-11 05:04:06Z mike $ 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 */ 61typedef 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 */ 77struct __dlfunc_arg { 78 int __dlfunc_dummy; 79}; 80 81typedef void (*dlfunc_t)(struct __dlfunc_arg); 82 83#endif /* __BSD_VISIBLE */ 84 85__BEGIN_DECLS 86/* XSI functions first. */ 87int dlclose(void *); 88const char * 89 dlerror(void); 90void *dlopen(const char *, int); 91void *dlsym(void * __restrict, const char * __restrict); 92 93#if __BSD_VISIBLE 94int dladdr(const void *, Dl_info *); 95dlfunc_t dlfunc(void * __restrict, const char * __restrict); 96void 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