1 /* User functions for run-time dynamic loading. 2 Copyright (C) 1995-1999, 2000, 2001 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20 #ifndef _DLFCN_H 21 #define _DLFCN_H 1 22 23 #include <features.h> 24 25 /* Collect various system dependent definitions and declarations. */ 26 #include <sys/dlfcn.h> 27 28 29 /* If the first argument of `dlsym' or `dlvsym' is set to RTLD_NEXT 30 the run-time address of the symbol called NAME in the next shared 31 object is returned. The "next" relation is defined by the order 32 the shared objects were loaded. */ 33 # define RTLD_NEXT ((void *) -1l) 34 35 /* If the first argument to `dlsym' or `dlvsym' is set to RTLD_DEFAULT 36 the run-time address of the symbol called NAME in the global scope 37 is returned. */ 38 # define RTLD_DEFAULT ((void *) 0) 39 40 41 __BEGIN_DECLS 42 43 /* Open the shared object FILE and map it in; return a handle that can be 44 passed to `dlsym' to get symbol values from it. */ 45 extern void *dlopen (__const char *__file, int __mode) __THROW; 46 47 /* Unmap and close a shared object opened by `dlopen'. 48 The handle cannot be used again after calling `dlclose'. */ 49 extern int dlclose (void *__handle) __THROW; 50 51 /* Find the run-time address in the shared object HANDLE refers to 52 of the symbol called NAME. */ 53 extern void *dlsym (void *__restrict __handle, 54 __const char *__restrict __name) __THROW; 55 56 /* Find the run-time address in the shared object HANDLE refers to 57 of the symbol called NAME with VERSION. */ 58 extern void *dlvsym (void *__restrict __handle, 59 __const char *__restrict __name, 60 __const char *__restrict __version) __THROW; 61 62 /* When any of the above functions fails, call this function 63 to return a string describing the error. Each call resets 64 the error string so that a following call returns null. */ 65 extern char *dlerror (void) __THROW; 66 67 68 /* Structure containing information about object searched using 69 `dladdr'. */ 70 typedef struct 71 { 72 __const char *dli_fname; /* File name of defining object. */ 73 void *dli_fbase; /* Load address of that object. */ 74 __const char *dli_sname; /* Name of nearest symbol. */ 75 void *dli_saddr; /* Exact value of nearest symbol. */ 76 } Dl_info; 77 78 /* Fill in *INFO with the following information about ADDRESS. 79 Returns 0 iff no shared object's segments contain that address. */ 80 extern int dladdr (__const void *__address, Dl_info *__info) __THROW; 81 82 __END_DECLS 83 84 #endif /* dlfcn.h */ 85