mirror of git://sourceware.org/git/glibc.git
72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/* Make sure dlopen/dlclose are not marked as leaf functions.
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Copyright (C) 2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Mike Frysinger <vapier@gentoo.org>
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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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<http://www.gnu.org/licenses/>. */
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/* The bug-dl-leaf.c file will call our lib_main directly. We do this to
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keep things simple -- no need to use --export-dynamic with the linker
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or build the main ELF as a PIE.
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The lib_main func will modify some of its state while dlopening and
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dlclosing the bug-dl-leaf-lib-cb.so library. The constructors and
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destructors in that library will call back into this library to also
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muck with state (the check_val_xxx funcs).
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If dlclose/dlopen are marked as "leaf" functions, then with newer
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versions of gcc, the state modification won't work correctly. */
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#include <assert.h>
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#include <dlfcn.h>
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static int val = 1;
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static int called = 0;
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void check_val_init (void)
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{
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called = 1;
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assert (val == 2);
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}
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void check_val_fini (void)
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{
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called = 2;
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assert (val == 4);
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}
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int lib_main (void)
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{
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int ret;
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void *hdl;
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/* Make sure the constructor sees the updated val. */
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val = 2;
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hdl = dlopen ("bug-dl-leaf-lib-cb.so", RTLD_GLOBAL | RTLD_LAZY);
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val = 3;
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assert (hdl);
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assert (called == 1);
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/* Make sure the destructor sees the updated val. */
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val = 4;
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ret = dlclose (hdl);
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val = 5;
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assert (ret == 0);
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assert (called == 2);
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return !val;
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}
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