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/* dlfcn.h -- User functions for run-time dynamic loading.
Copyright (C) 1995, 1996 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. 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>
/* The MODE argument to `dlopen' contains one of the following: */
#define RTLD_LAZY 0x001 /* Lazy function call binding. */
#define RTLD_NOW 0x002 /* Immediate function call binding. */
#define RTLD_BINDING_MASK 0x3 /* Mask of binding time value. */
/* If the following bit is set in the MODE argument to `dlopen',
the symbols of the loaded object and its dependencies are made
visible as if the object were linked directly into the program. */
#define RTLD_GLOBAL 0x100
/* If the first argument of `dlsym' 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)
/* 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 __P ((__const char *__file, int __mode));
/* Unmap and close a shared object opened by `dlopen'.
The handle cannot be used again after calling `dlclose'. */
extern int dlclose __P ((void *__handle));
/* Find the run-time address in the shared object HANDLE refers to
of the symbol called NAME. */
extern void *dlsym __P ((void *__handle, __const char *__name));
/* 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 __P ((void));
/* Fill in *INFO with the following information about ADDRESS.
Returns 0 iff no shared object's segments contain that address. */
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;
extern int dladdr __P ((void *__address, Dl_info *__info));
#endif /* dlfcn.h */
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