summary refs log tree commit diff
path: root/dlfcn/dlinfo.c
blob: b1e2b009a5e29d2d6a06eafe883ca3f7a2b86bc1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/* dlinfo -- Get information from the dynamic linker.
   Copyright (C) 2003, 2004, 2006 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.  */

#include <dlfcn.h>
#include <link.h>
#include <ldsodefs.h>
#include <libintl.h>

#if !defined SHARED && defined IS_IN_libdl

int
dlinfo (void *handle, int request, void *arg)
{
  return __dlinfo (handle, request, arg, RETURN_ADDRESS (0));
}

#else

# ifdef USE_TLS
#  include <dl-tls.h>
# endif

struct dlinfo_args
{
  ElfW(Addr) caller;
  void *handle;
  int request;
  void *arg;
};

static void
dlinfo_doit (void *argsblock)
{
  struct dlinfo_args *const args = argsblock;
  struct link_map *l = args->handle;

# if 0
  if (args->handle == RTLD_SELF)
    {
      Lmid_t nsid;

      /* Find the highest-addressed object that CALLER is not below.  */
      for (nsid = 0; nsid < DL_NNS; ++nsid)
	for (l = GL(dl_ns)[nsid]._ns_loaded; l != NULL; l = l->l_next)
	  if (caller >= l->l_map_start && caller < l->l_map_end)
	    /* There must be exactly one DSO for the range of the virtual
	       memory.  Otherwise something is really broken.  */
	    break;

      if (l == NULL)
	GLRO(dl_signal_error) (0, NULL, NULL, N_("\
RTLD_SELF used in code not dynamically loaded"));
    }
# endif

  switch (args->request)
    {
    case RTLD_DI_CONFIGADDR:
    default:
      GLRO(dl_signal_error) (0, NULL, NULL, N_("unsupported dlinfo request"));
      break;

    case RTLD_DI_LMID:
      *(Lmid_t *) args->arg = l->l_ns;
      break;

    case RTLD_DI_LINKMAP:
      *(struct link_map **) args->arg = l;
      break;

    case RTLD_DI_SERINFO:
      _dl_rtld_di_serinfo (l, args->arg, false);
      break;
    case RTLD_DI_SERINFOSIZE:
      _dl_rtld_di_serinfo (l, args->arg, true);
      break;

    case RTLD_DI_ORIGIN:
      strcpy (args->arg, l->l_origin);
      break;

    case RTLD_DI_TLS_MODID:
      *(size_t *) args->arg = 0;
#ifdef USE_TLS
      *(size_t *) args->arg = l->l_tls_modid;
#endif
      break;

    case RTLD_DI_TLS_DATA:
      {
	void *data = NULL;
#ifdef USE_TLS
	if (l->l_tls_modid != 0)
	  data = _dl_tls_get_addr_soft (l);
#endif
	*(void **) args->arg = data;
	break;
      }
    }
}

int
__dlinfo (void *handle, int request, void *arg DL_CALLER_DECL)
{
# ifdef SHARED
  if (__builtin_expect (_dlfcn_hook != NULL, 0))
    return _dlfcn_hook->dlinfo (handle, request, arg,
				DL_CALLER);
# endif

  struct dlinfo_args args = { (ElfW(Addr)) DL_CALLER,
			      handle, request, arg };
  return _dlerror_run (&dlinfo_doit, &args) ? -1 : 0;
}
# ifdef SHARED
strong_alias (__dlinfo, dlinfo)
# endif
#endif