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41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/* Copyright (C) 2013 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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/* Dynamic module with TLS to be accessed by a signal handler to check safety
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of that mode. */
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#include <semaphore.h>
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#include <signal.h>
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#include <unistd.h>
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/* This is an unlikely value to see in incorrectly initialized TLS
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block -- make sure we're initialized properly. */
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static __thread intptr_t tls_data = 0xdeadbeef;
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void
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action (int signo, siginfo_t *info, void *ignored)
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{
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if (tls_data != 0xdeadbeef)
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{
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write (STDOUT_FILENO, "wrong TLS value\n", 17);
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_exit (1);
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}
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/* arbitrary choice, just write something unique-ish. */
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tls_data = (intptr_t) info;
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}
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