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authorMaciej W. Rozycki <macro@codesourcery.com>2013-06-28 17:43:07 +0100
committerMaciej W. Rozycki <macro@codesourcery.com>2013-06-28 17:43:07 +0100
commit3d0f5d0c7a2de86575d68618352f7a5dfe7305fd (patch)
tree9eb636ac910bcdf4b55579694c4fe2bb8dfa7938 /dlfcn/tststatic5.c
parentf91f1c0fb89056995f1c9c6a06c361efdf5139e7 (diff)
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Add a dlopen/getpagesize static executable test.
Diffstat (limited to 'dlfcn/tststatic5.c')
-rw-r--r--dlfcn/tststatic5.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/dlfcn/tststatic5.c b/dlfcn/tststatic5.c
new file mode 100644
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+++ b/dlfcn/tststatic5.c
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+/* GLRO(dl_pagesize) initialization DSO test with a static executable.
+ Copyright (C) 2013 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <dlfcn.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <unistd.h>
+
+/* Check that the same page size is reported both directly and by a DSO
+ mapped from a static executable.
+
+ On targets that support different page sizes, the kernel communicates
+ the size currently in use via the auxiliary vector. This vector is
+ available to initial startup, but not any DSOs loaded later on. As
+ static executables do not export their symbols a DSO cannot access
+ the value obtained by initial startup and the value therefore has to
+ be passed on to the DSO and stored within its data area explicitly.
+ This is performed by a call to DL_STATIC_INIT that is defined in a
+ target-dependent way, and that on variable page size targets stores
+ it in the GLRO(dl_pagesize) variable of the DSO's dynamic linker. */
+static int
+do_test (void)
+{
+ int pagesize = getpagesize ();
+ int (*my_getpagesize) (void);
+ int my_pagesize;
+ void *handle;
+
+ /* Try to map a module. */
+ handle = dlopen ("modstatic5.so", RTLD_LAZY | RTLD_LOCAL);
+ if (handle == NULL)
+ {
+ printf ("dlopen (modstatic5.so): %s\n", dlerror ());
+ return 1;
+ }
+
+ /* Get at its symbol. */
+ my_getpagesize = dlsym (handle, "my_getpagesize");
+ if (my_getpagesize == NULL)
+ {
+ printf ("dlsym (my_getpagesize): %s\n", dlerror ());
+ return 1;
+ }
+
+ /* Make sure the page size reported is the same either way. */
+ my_pagesize = my_getpagesize ();
+ if (my_pagesize != pagesize)
+ {
+ printf ("my_getpagesize: got %i, expected %i\n", my_pagesize, pagesize);
+ return 1;
+ }
+
+ /* All done, clean up. */
+ my_getpagesize = NULL;
+ dlclose (handle);
+
+ return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"