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Previously, after destructors for a DSO have been invoked, ld.so refused to bind against that DSO in all cases. Relax this restriction somewhat if the referencing object is itself a DSO that is being unloaded. This assumes that the symbol reference is not going to be stored anywhere. The situation in the test case can arise fairly easily with C++ and objects that are built with different optimization levels and therefore define different functions with vague linkage. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
37 lines
1.4 KiB
C
37 lines
1.4 KiB
C
/* Lazy binding during dlclose. Directly loaded module.
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Copyright (C) 2023 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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/* This function is called from exported_function below. It is only
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defined in this module. The weak attribute mimics how G++
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implements vague linkage for C++. */
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void __attribute__ ((weak))
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lazily_bound_exported_function (void)
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{
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}
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/* Called from tst-dlclose-lazy-mod2.so. */
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void
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exported_function (int call_it)
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{
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if (call_it)
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/* Previous to the fix this would crash when called during dlclose
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since symbols from the DSO were no longer available for binding
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(bug 30425) after the DSO started being closed by dlclose. */
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lazily_bound_exported_function ();
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}
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