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93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/* TLS modid gap reuse regression test for bug 29039.
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Copyright (C) 2023-2024 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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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <dlfcn.h>
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#include <pthread.h>
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#include <support/xdlfcn.h>
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#include <support/xthread.h>
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#include <support/check.h>
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static void *mod[3];
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#define MOD(i) "tst-tlsgap-mod" #i ".so"
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static const char *modname[3] = { MOD(0), MOD(1), MOD(2) };
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#undef MOD
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static void
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open_mod (int i)
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{
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mod[i] = xdlopen (modname[i], RTLD_LAZY);
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printf ("open %s\n", modname[i]);
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}
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static void
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close_mod (int i)
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{
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xdlclose (mod[i]);
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mod[i] = NULL;
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printf ("close %s\n", modname[i]);
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}
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static void
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access_mod (int i, const char *sym)
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{
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int *(*f) (void) = xdlsym (mod[i], sym);
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int *p = f ();
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printf ("access %s: %s() = %p\n", modname[i], sym, p);
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TEST_VERIFY_EXIT (p != NULL);
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++*p;
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}
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static void *
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start (void *arg)
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{
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/* The DTV generation is at the last dlopen of mod0 and the
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entry for mod1 is NULL. */
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open_mod (1); /* Reuse modid of mod1. Uses dynamic TLS. */
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/* DTV is unchanged: dlopen only updates the DTV to the latest
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generation if static TLS is allocated for a loaded module.
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With bug 29039, the TLSDESC relocation in mod1 uses the old
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dlclose generation of mod1 instead of the new dlopen one so
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DTV is not updated on TLS access. */
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access_mod (1, "f1");
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return arg;
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}
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static int
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do_test (void)
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{
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open_mod (0);
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open_mod (1);
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open_mod (2);
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close_mod (0);
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close_mod (1); /* Create modid gap at mod1. */
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open_mod (0); /* Reuse modid of mod0, bump generation count. */
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/* Create a thread where DTV of mod1 is NULL. */
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pthread_t t = xpthread_create (NULL, start, NULL);
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xpthread_join (t);
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return 0;
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}
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#include <support/test-driver.c>
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