| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* GLRO(dl_pagesize) initialization DSO test with a static executable. |
| 2 | Copyright (C) 2013-2015 Free Software Foundation, Inc. |
| 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 |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 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" |