1 | /* Make sure dlopen/dlclose are not marked as leaf functions. |
2 | |
3 | Copyright (C) 2013-2022 Free Software Foundation, Inc. |
4 | This file is part of the GNU C Library. |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either |
9 | version 2.1 of the License, or (at your option) any later version. |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | Lesser General Public License for more details. |
15 | |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, see |
18 | <https://www.gnu.org/licenses/>. */ |
19 | |
20 | /* The bug-dl-leaf.c file will call our lib_main directly. We do this to |
21 | keep things simple -- no need to use --export-dynamic with the linker |
22 | or build the main ELF as a PIE. |
23 | |
24 | The lib_main func will modify some of its state while dlopening and |
25 | dlclosing the bug-dl-leaf-lib-cb.so library. The constructors and |
26 | destructors in that library will call back into this library to also |
27 | muck with state (the check_val_xxx funcs). |
28 | |
29 | If dlclose/dlopen are marked as "leaf" functions, then with newer |
30 | versions of gcc, the state modification won't work correctly. */ |
31 | |
32 | #include <assert.h> |
33 | #include <dlfcn.h> |
34 | |
35 | static int val = 1; |
36 | static int called = 0; |
37 | |
38 | void check_val_init (void) |
39 | { |
40 | called = 1; |
41 | assert (val == 2); |
42 | } |
43 | |
44 | void check_val_fini (void) |
45 | { |
46 | called = 2; |
47 | assert (val == 4); |
48 | } |
49 | |
50 | int lib_main (void) |
51 | { |
52 | int ret __attribute__ ((unused)); |
53 | void *hdl; |
54 | |
55 | /* Make sure the constructor sees the updated val. */ |
56 | val = 2; |
57 | hdl = dlopen (file: "bug-dl-leaf-lib-cb.so" , RTLD_GLOBAL | RTLD_LAZY); |
58 | val = 3; |
59 | assert (hdl); |
60 | assert (called == 1); |
61 | |
62 | /* Make sure the destructor sees the updated val. */ |
63 | val = 4; |
64 | ret = dlclose (handle: hdl); |
65 | val = 5; |
66 | assert (ret == 0); |
67 | assert (called == 2); |
68 | |
69 | return !val; |
70 | } |
71 | |