1: /* System dependent definitions for run-time dynamic loading.
    2:    Copyright (C) 1996-2001, 2004 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: # error "Never use <bits/dlfcn.h> directly; include <dlfcn.h> instead."
   22: #endif
   23: 
   24: /* The MODE argument to `dlopen' contains one of the following: */
   25: #define RTLD_LAZY       0x00001       /* Lazy function call binding.  */
   26: #define RTLD_NOW        0x00002        /* Immediate function call binding.  */
   27: #define RTLD_BINDING_MASK   0x3 /* Mask of binding time value.  */
   28: #define RTLD_NOLOAD     0x00004     /* Do not load the object.  */
   29: #define RTLD_DEEPBIND   0x00008   /* Use deep binding.  */
   30: 
   31: /* If the following bit is set in the MODE argument to `dlopen',
   32:    the symbols of the loaded object and its dependencies are made
   33:    visible as if the object were linked directly into the program.  */
   34: #define RTLD_GLOBAL     0x00100
   35: 
   36: /* Unix98 demands the following flag which is the inverse to RTLD_GLOBAL.
   37:    The implementation does this by default and so we can define the
   38:    value to zero.  */
   39: #define RTLD_LOCAL      0
   40: 
   41: /* Do not delete object when closed.  */
   42: #define RTLD_NODELETE   0x01000
   43: 
   44: #ifdef __USE_GNU
   45: /* To support profiling of shared objects it is a good idea to call
   46:    the function found using `dlsym' using the following macro since
   47:    these calls do not use the PLT.  But this would mean the dynamic
   48:    loader has no chance to find out when the function is called.  The
   49:    macro applies the necessary magic so that profiling is possible.
   50:    Rewrite
   51:         foo = (*fctp) (arg1, arg2);
   52:    into
   53:         foo = DL_CALL_FCT (fctp, (arg1, arg2));
   54: */
   55: # define DL_CALL_FCT(fctp, args) \
   56:   (_dl_mcount_wrapper_check ((void *) (fctp)), (*(fctp)) args)
   57: 
   58: __BEGIN_DECLS
   59: 
   60: /* This function calls the profiling functions.  */
   61: extern void _dl_mcount_wrapper_check (void *__selfpc) __THROW;
   62: 
   63: __END_DECLS
   64: 
   65: #endif