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77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
/* GLRO(dl_pagesize) initialization DSO test with a static executable.
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Copyright (C) 2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <dlfcn.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <unistd.h>
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/* Check that the same page size is reported both directly and by a DSO
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mapped from a static executable.
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On targets that support different page sizes, the kernel communicates
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the size currently in use via the auxiliary vector. This vector is
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available to initial startup, but not any DSOs loaded later on. As
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static executables do not export their symbols a DSO cannot access
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the value obtained by initial startup and the value therefore has to
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be passed on to the DSO and stored within its data area explicitly.
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This is performed by a call to DL_STATIC_INIT that is defined in a
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target-dependent way, and that on variable page size targets stores
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it in the GLRO(dl_pagesize) variable of the DSO's dynamic linker. */
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static int
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do_test (void)
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{
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int pagesize = getpagesize ();
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int (*my_getpagesize) (void);
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int my_pagesize;
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void *handle;
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/* Try to map a module. */
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handle = dlopen ("modstatic5.so", RTLD_LAZY | RTLD_LOCAL);
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if (handle == NULL)
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{
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printf ("dlopen (modstatic5.so): %s\n", dlerror ());
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return 1;
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}
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/* Get at its symbol. */
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my_getpagesize = dlsym (handle, "my_getpagesize");
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if (my_getpagesize == NULL)
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{
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printf ("dlsym (my_getpagesize): %s\n", dlerror ());
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return 1;
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}
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/* Make sure the page size reported is the same either way. */
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my_pagesize = my_getpagesize ();
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if (my_pagesize != pagesize)
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{
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printf ("my_getpagesize: got %i, expected %i\n", my_pagesize, pagesize);
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return 1;
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}
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/* All done, clean up. */
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my_getpagesize = NULL;
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dlclose (handle);
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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