mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-28 05:21:13 +00:00
78b31cc834
After static dlopen, a copy of ld.so is loaded into the inner namespace, but that copy is not initialized at all. Some architectures run into serious problems as result, which is why the _dl_var_init mechanism was invented. With libpthread moving into libc and parts into ld.so, more architectures impacted, so it makes sense to switch to a generic mechanism which performs the partial initialization. As a result, getauxval now works after static dlopen (bug 20802). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/* Test getauxval from a dynamic library after static dlopen.
|
|
Copyright (C) 2021 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <dlfcn.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <support/check.h>
|
|
#include <support/xdlfcn.h>
|
|
#include <sys/auxv.h>
|
|
|
|
unsigned long getauxval_wrapper (unsigned long type, int *errnop);
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
unsigned long outer_random = getauxval (AT_RANDOM);
|
|
if (outer_random == 0)
|
|
FAIL_UNSUPPORTED ("getauxval does not support AT_RANDOM");
|
|
|
|
unsigned long missing_auxv_type;
|
|
for (missing_auxv_type = AT_RANDOM + 1; ; ++missing_auxv_type)
|
|
{
|
|
errno = 0;
|
|
if (getauxval (missing_auxv_type) == 0 && errno != 0)
|
|
{
|
|
TEST_COMPARE (errno, ENOENT);
|
|
break;
|
|
}
|
|
}
|
|
printf ("info: first missing type: %lu\n", missing_auxv_type);
|
|
|
|
void *handle = xdlopen ("tst-auxvalmod.so", RTLD_LAZY);
|
|
void *ptr = xdlsym (handle, "getauxval_wrapper");
|
|
|
|
__typeof__ (getauxval_wrapper) *wrapper = ptr;
|
|
int inner_errno = 0;
|
|
unsigned long inner_random = wrapper (AT_RANDOM, &inner_errno);
|
|
TEST_COMPARE (outer_random, inner_random);
|
|
|
|
inner_errno = 0;
|
|
TEST_COMPARE (wrapper (missing_auxv_type, &inner_errno), 0);
|
|
TEST_COMPARE (inner_errno, ENOENT);
|
|
|
|
TEST_COMPARE (getauxval (AT_HWCAP), wrapper (AT_HWCAP, &inner_errno));
|
|
TEST_COMPARE (getauxval (AT_HWCAP2), wrapper (AT_HWCAP2, &inner_errno));
|
|
|
|
xdlclose (handle);
|
|
return 0;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|