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/* Test of sigaltstack wrappers.
Copyright (C) 2019-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <support/xsignal.h>
#include <support/support.h>
#include <support/xunistd.h>
#include <support/check.h>
#include <stdint.h>
#include <stdio.h>
static volatile uintptr_t handler_stackaddr;
static void
handler (int unused)
{
int var;
handler_stackaddr = (uintptr_t) &var;
}
int
do_test (void)
{
void *sstk = xalloc_sigstack (0);
unsigned char *sp;
size_t size;
xget_sigstack_location (sstk, &sp, &size);
printf ("signal stack installed: sp=%p size=%zu\n", sp, size);
struct sigaction sa;
sa.sa_handler = handler;
sa.sa_flags = SA_RESTART | SA_ONSTACK;
sigfillset (&sa.sa_mask);
if (sigaction (SIGUSR1, &sa, 0))
FAIL_RET ("sigaction (SIGUSR1, handler): %m\n");
raise (SIGUSR1);
uintptr_t haddr = handler_stackaddr;
printf ("address of handler local variable: %p\n", (void *)haddr);
TEST_VERIFY ((uintptr_t)sp < haddr);
TEST_VERIFY (haddr < (uintptr_t)sp + size);
xfree_sigstack (sstk);
return 0;
}
#include <support/test-driver.c>
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