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/* User functions for run-time dynamic loading.

   Copyright (C) 1995-1999, 2000, 2001 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 <sys/dlfcn.h>

/* 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)

__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;

/* 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;

/* 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;

/* 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;

__END_DECLS

#endif  /* dlfcn.h */