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3d0f5d0c | 1 | /* GLRO(dl_pagesize) initialization DSO test with a static executable. |
d614a753 | 2 | Copyright (C) 2013-2020 Free Software Foundation, Inc. |
3d0f5d0c MR |
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, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
3d0f5d0c MR |
18 | |
19 | #include <dlfcn.h> | |
20 | #include <stddef.h> | |
21 | #include <stdio.h> | |
22 | #include <unistd.h> | |
23 | ||
24 | /* Check that the same page size is reported both directly and by a DSO | |
25 | mapped from a static executable. | |
26 | ||
27 | On targets that support different page sizes, the kernel communicates | |
28 | the size currently in use via the auxiliary vector. This vector is | |
29 | available to initial startup, but not any DSOs loaded later on. As | |
30 | static executables do not export their symbols a DSO cannot access | |
31 | the value obtained by initial startup and the value therefore has to | |
32 | be passed on to the DSO and stored within its data area explicitly. | |
33 | This is performed by a call to DL_STATIC_INIT that is defined in a | |
34 | target-dependent way, and that on variable page size targets stores | |
35 | it in the GLRO(dl_pagesize) variable of the DSO's dynamic linker. */ | |
36 | static int | |
37 | do_test (void) | |
38 | { | |
39 | int pagesize = getpagesize (); | |
40 | int (*my_getpagesize) (void); | |
41 | int my_pagesize; | |
42 | void *handle; | |
43 | ||
44 | /* Try to map a module. */ | |
45 | handle = dlopen ("modstatic5.so", RTLD_LAZY | RTLD_LOCAL); | |
46 | if (handle == NULL) | |
47 | { | |
48 | printf ("dlopen (modstatic5.so): %s\n", dlerror ()); | |
49 | return 1; | |
50 | } | |
51 | ||
52 | /* Get at its symbol. */ | |
53 | my_getpagesize = dlsym (handle, "my_getpagesize"); | |
54 | if (my_getpagesize == NULL) | |
55 | { | |
56 | printf ("dlsym (my_getpagesize): %s\n", dlerror ()); | |
57 | return 1; | |
58 | } | |
59 | ||
60 | /* Make sure the page size reported is the same either way. */ | |
61 | my_pagesize = my_getpagesize (); | |
62 | if (my_pagesize != pagesize) | |
63 | { | |
64 | printf ("my_getpagesize: got %i, expected %i\n", my_pagesize, pagesize); | |
65 | return 1; | |
66 | } | |
67 | ||
68 | /* All done, clean up. */ | |
69 | my_getpagesize = NULL; | |
70 | dlclose (handle); | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | #define TEST_FUNCTION do_test () | |
76 | #include "../test-skeleton.c" |