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01: /* System dependent definitions for run-time dynamic loading.
02:    Copyright (C) 1996-2001, 2004 Free Software Foundation, Inc.
03:    This file is part of the GNU C Library.
04: 
05:    The GNU C Library is free software; you can redistribute it and/or
06:    modify it under the terms of the GNU Lesser General Public
07:    License as published by the Free Software Foundation; either
08:    version 2.1 of the License, or (at your option) any later version.
09: 
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
66: 

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