65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
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/* Test of sigaltstack wrappers.
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Copyright (C) 2019-2022 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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#include <support/xsignal.h>
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#include <support/support.h>
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#include <support/xunistd.h>
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#include <support/check.h>
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#include <stdint.h>
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#include <stdio.h>
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static volatile uintptr_t handler_stackaddr;
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static void
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handler (int unused)
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{
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int var;
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handler_stackaddr = (uintptr_t) &var;
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}
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int
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do_test (void)
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{
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void *sstk = xalloc_sigstack (0);
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unsigned char *sp;
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size_t size;
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xget_sigstack_location (sstk, &sp, &size);
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printf ("signal stack installed: sp=%p size=%zu\n", sp, size);
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struct sigaction sa;
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sa.sa_handler = handler;
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sa.sa_flags = SA_RESTART | SA_ONSTACK;
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sigfillset (&sa.sa_mask);
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if (sigaction (SIGUSR1, &sa, 0))
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FAIL_RET ("sigaction (SIGUSR1, handler): %m\n");
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raise (SIGUSR1);
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uintptr_t haddr = handler_stackaddr;
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printf ("address of handler local variable: %p\n", (void *)haddr);
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TEST_VERIFY ((uintptr_t)sp < haddr);
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TEST_VERIFY (haddr < (uintptr_t)sp + size);
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xfree_sigstack (sstk);
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return 0;
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}
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#include <support/test-driver.c>
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