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: src/include/dlfcn.h,v 1.10.2.3 2003/02/20 20:42:45 kan Exp $ 34 * $DragonFly: src/include/dlfcn.h,v 1.5 2004/02/26 13:58:25 joerg Exp $ 35 */ 36 37 #ifndef _DLFCN_H_ 38 #define _DLFCN_H_ 39 40 #include <sys/cdefs.h> 41 #include <machine/stdint.h> /* size_t */ 42 43 /* 44 * Modes and flags for dlopen(). 45 */ 46 #define RTLD_LAZY 1 /* Bind function calls lazily */ 47 #define RTLD_NOW 2 /* Bind function calls immediately */ 48 #define RTLD_MODEMASK 0x3 49 #define RTLD_GLOBAL 0x100 /* Make symbols globally available */ 50 #define RTLD_LOCAL 0 /* Opposite of RTLD_GLOBAL, and the default */ 51 #define RTLD_TRACE 0x200 /* Trace loaded objects and exit */ 52 53 /* 54 * Request arguments for dlinfo(). 55 */ 56 #define RTLD_DI_LINKMAP 2 57 #define RTLD_DI_SERINFO 4 58 #define RTLD_DI_SERINFOSIZE 5 59 #define RTLD_DI_ORIGIN 6 60 61 /* 62 * Special handle arguments for dlsym()/dlinfo(). 63 */ 64 #define RTLD_NEXT ((void *) -1) /* Search subsequent objects */ 65 #define RTLD_DEFAULT ((void *) -2) /* Use default search algorithm */ 66 #define RTLD_SELF ((void *) -3) /* Search the caller itself. */ 67 68 #if __BSD_VISIBLE 69 /* 70 * Structure filled in by dladdr(). 71 */ 72 typedef struct dl_info { 73 const char *dli_fname; /* Pathname of shared object */ 74 void *dli_fbase; /* Base address of shared object */ 75 const char *dli_sname; /* Name of nearest symbol */ 76 void *dli_saddr; /* Address of nearest symbol */ 77 } Dl_info; 78 79 /* 80 * Avoid sys/types.h namespace pollution. 81 */ 82 83 /* 84 * Structures, returned by the RTLD_DI_SERINFO dlinfo() request. 85 */ 86 typedef struct dl_serpath { 87 char * dls_name; /* single search path entry */ 88 unsigned int dls_flags; /* path information */ 89 } Dl_serpath; 90 91 typedef struct dl_serinfo { 92 __size_t dls_size; /* total buffer size */ 93 unsigned int dls_cnt; /* number of path entries */ 94 Dl_serpath dls_serpath[1]; /* there may be more than one */ 95 } Dl_serinfo; 96 97 /* 98 * The actual type declared by this typedef is immaterial, provided that 99 * it is a function pointer. Its purpose is to provide a return type for 100 * dlfunc() which can be cast to a function pointer type without depending 101 * on behavior undefined by the C standard, which might trigger a compiler 102 * diagnostic. We intentionally declare a unique type signature to force 103 * a diagnostic should the application not cast the return value of dlfunc() 104 * appropriately. 105 */ 106 struct __dlfunc_arg { 107 int __dlfunc_dummy; 108 }; 109 110 typedef void (*dlfunc_t)(struct __dlfunc_arg); 111 112 #endif /* __BSD_VISIBLE */ 113 114 __BEGIN_DECLS 115 /* XSI functions first */ 116 int dlclose(void *); 117 const char *dlerror(void); 118 void *dlopen(const char *, int); 119 void *dlsym(void * __restrict, const char * __restrict); 120 121 #if __BSD_VISIBLE 122 int dladdr(const void * __restrict, Dl_info * __restrict); 123 dlfunc_t dlfunc(void * __restrict, const char * __restrict); 124 int dlinfo(void * __restrict, int, void * __restrict); 125 void dllockinit(void *, void *(*)(void *), void (*)(void *), 126 void (*)(void *), void (*)(void *), 127 void (*)(void *), void (*)(void *)); 128 #endif /* __BSD_VISIBLE */ 129 __END_DECLS 130 131 #endif /* !_DLFCN_H_ */ 132