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[glibc/history.git] / dlfcn / dlopenold.c
blob8dae1c40cecdbc88e048e4f772b3cfb639328351
1 /* Load a shared object at run time.
2 Copyright (C) 1995-1999, 2000, 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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. */
20 #include <dlfcn.h>
21 #include <stddef.h>
22 #include <unistd.h>
23 #include <ldsodefs.h>
25 /* This file is for compatibility with glibc 2.0. Compile it only if
26 versioning is used. */
27 #include <shlib-compat.h>
28 #if SHLIB_COMPAT (libdl, GLIBC_2_0, GLIBC_2_1)
30 struct dlopen_args
32 /* The arguments for dlopen_doit. */
33 const char *file;
34 int mode;
35 /* The return value of dlopen_doit. */
36 void *new;
37 /* Address of the caller. */
38 const void *caller;
42 /* Non-shared code has no support for multiple namespaces. */
43 #ifdef SHARED
44 # define NS __LM_ID_CALLER
45 #else
46 # define NS LM_ID_BASE
47 #endif
50 static void
51 dlopen_doit (void *a)
53 struct dlopen_args *args = (struct dlopen_args *) a;
55 args->new = GLRO(dl_open) (args->file ?: "", args->mode | __RTLD_DLOPEN,
56 args->caller,
57 args->file == NULL ? LM_ID_BASE : NS,
58 __dlfcn_argc, __dlfcn_argv, __environ);
61 extern void *__dlopen_nocheck (const char *file, int mode);
62 void *
63 __dlopen_nocheck (const char *file, int mode)
65 struct dlopen_args args;
66 args.file = file;
67 args.caller = RETURN_ADDRESS (0);
69 if ((mode & RTLD_BINDING_MASK) == 0)
70 /* By default assume RTLD_LAZY. */
71 mode |= RTLD_LAZY;
72 args.mode = mode;
74 if (__builtin_expect (_dlfcn_hook != NULL, 0))
75 return _dlfcn_hook->dlopen (file, mode, RETURN_ADDRESS (0));
77 return _dlerror_run (dlopen_doit, &args) ? NULL : args.new;
79 compat_symbol (libdl, __dlopen_nocheck, dlopen, GLIBC_2_0);
80 #endif