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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.
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Copyright (C) 2021 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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<https://www.gnu.org/licenses/>. */
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#include <dlfcn.h>
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#include <errno.h>
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#include <stdio.h>
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#include <support/check.h>
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#include <support/xdlfcn.h>
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#include <sys/auxv.h>
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unsigned long getauxval_wrapper (unsigned long type, int *errnop);
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static int
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do_test (void)
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{
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unsigned long outer_random = getauxval (AT_RANDOM);
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if (outer_random == 0)
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FAIL_UNSUPPORTED ("getauxval does not support AT_RANDOM");
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unsigned long missing_auxv_type;
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for (missing_auxv_type = AT_RANDOM + 1; ; ++missing_auxv_type)
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{
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errno = 0;
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if (getauxval (missing_auxv_type) == 0 && errno != 0)
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{
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TEST_COMPARE (errno, ENOENT);
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break;
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}
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}
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printf ("info: first missing type: %lu\n", missing_auxv_type);
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void *handle = xdlopen ("tst-auxvalmod.so", RTLD_LAZY);
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void *ptr = xdlsym (handle, "getauxval_wrapper");
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__typeof__ (getauxval_wrapper) *wrapper = ptr;
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int inner_errno = 0;
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unsigned long inner_random = wrapper (AT_RANDOM, &inner_errno);
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TEST_COMPARE (outer_random, inner_random);
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inner_errno = 0;
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TEST_COMPARE (wrapper (missing_auxv_type, &inner_errno), 0);
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TEST_COMPARE (inner_errno, ENOENT);
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TEST_COMPARE (getauxval (AT_HWCAP), wrapper (AT_HWCAP, &inner_errno));
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TEST_COMPARE (getauxval (AT_HWCAP2), wrapper (AT_HWCAP2, &inner_errno));
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xdlclose (handle);
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return 0;
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}
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#include <support/test-driver.c>
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