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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>
48 lines
1.9 KiB
C
48 lines
1.9 KiB
C
/* Test lazy binding during dlclose (bug 30425).
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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 test re-creates a situation that can arise naturally for C++
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applications due to the use of vague linkage and differences in the
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set of compiler-emitted functions. A function in
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tst-dlclose-lazy-mod1.so (exported_function) interposes a function
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in tst-dlclose-lazy-mod2.so. This function is called from the
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destructor in tst-dlclose-lazy-mod2.so, after the destructor for
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tst-dlclose-lazy-mod1.so has already completed. Prior to the fix
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for bug 30425, this would lead to a lazy binding failure in
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tst-dlclose-lazy-mod1.so because dlclose had already marked the DSO
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as unavailable for binding (by setting l_removed). */
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#include <dlfcn.h>
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#include <support/xdlfcn.h>
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#include <support/check.h>
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int
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main (void)
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{
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/* Load tst-dlclose-lazy-mod1.so, indirectly loading
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tst-dlclose-lazy-mod2.so. */
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void *handle = xdlopen ("tst-dlclose-lazy-mod1.so", RTLD_GLOBAL | RTLD_LAZY);
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/* Invoke the destructor of tst-dlclose-lazy-mod2.so, which calls
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into tst-dlclose-lazy-mod1.so after its destructor has been
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called. */
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xdlclose (handle);
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return 0;
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}
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