/* User functions for run-time dynamic loading. Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #ifndef _DLFCN_H #define _DLFCN_H 1 #include <features.h> /* Collect various system dependent definitions and declarations. */ #include <bits/dlfcn.h> #ifdef __USE_GNU /* If the first argument of `dlsym' or `dlvsym' is set to RTLD_NEXT the run-time address of the symbol called NAME in the next shared object is returned. The "next" relation is defined by the order the shared objects were loaded. */ # define RTLD_NEXT ((void *) -1l) /* If the first argument to `dlsym' or `dlvsym' is set to RTLD_DEFAULT the run-time address of the symbol called NAME in the global scope is returned. */ # define RTLD_DEFAULT ((void *) 0) #endif __BEGIN_DECLS /* Open the shared object FILE and map it in; return a handle that can be passed to `dlsym' to get symbol values from it. */ extern void *dlopen (__const char *__file, int __mode) __THROW; /* Unmap and close a shared object opened by `dlopen'. The handle cannot be used again after calling `dlclose'. */ extern int dlclose (void *__handle) __THROW; /* Find the run-time address in the shared object HANDLE refers to of the symbol called NAME. */ extern void *dlsym (void *__restrict __handle, __const char *__restrict __name) __THROW; #ifdef __USE_GNU /* Find the run-time address in the shared object HANDLE refers to of the symbol called NAME with VERSION. */ extern void *dlvsym (void *__restrict __handle, __const char *__restrict __name, __const char *__restrict __version) __THROW; #endif /* When any of the above functions fails, call this function to return a string describing the error. Each call resets the error string so that a following call returns null. */ extern char *dlerror (void) __THROW; #ifdef __USE_GNU /* Structure containing information about object searched using `dladdr'. */ typedef struct { __const char *dli_fname; /* File name of defining object. */ void *dli_fbase; /* Load address of that object. */ __const char *dli_sname; /* Name of nearest symbol. */ void *dli_saddr; /* Exact value of nearest symbol. */ } Dl_info; /* Fill in *INFO with the following information about ADDRESS. Returns 0 iff no shared object's segments contain that address. */ extern int dladdr (const void *__address, Dl_info *__info) __THROW; #endif __END_DECLS #endif /* dlfcn.h */