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85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
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/* Test of signal delivery on an alternate stack with MINSIGSTKSZ size.
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Copyright (C) 2020 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 <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <support/check.h>
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#include <support/support.h>
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static volatile sig_atomic_t handler_run;
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static void
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handler (int signo)
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{
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/* Clear a bit of on-stack memory. */
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volatile char buffer[256];
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for (size_t i = 0; i < sizeof (buffer); ++i)
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buffer[i] = 0;
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handler_run = 1;
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}
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int
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do_test (void)
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{
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size_t stack_buffer_size = 64 * 1024 * 1024;
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void *stack_buffer = xmalloc (stack_buffer_size);
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void *stack_end = stack_buffer + stack_buffer_size;
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memset (stack_buffer, 0xCC, stack_buffer_size);
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void *stack_bottom = stack_buffer + (stack_buffer_size + MINSIGSTKSZ) / 2;
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void *stack_top = stack_bottom + MINSIGSTKSZ;
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stack_t stack =
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{
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.ss_sp = stack_bottom,
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.ss_size = MINSIGSTKSZ,
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};
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if (sigaltstack (&stack, NULL) < 0)
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FAIL_RET ("sigaltstack: %m\n");
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struct sigaction act =
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{
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.sa_handler = handler,
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.sa_flags = SA_ONSTACK,
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};
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if (sigaction (SIGUSR1, &act, NULL) < 0)
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FAIL_RET ("sigaction: %m\n");
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if (kill (getpid (), SIGUSR1) < 0)
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FAIL_RET ("kill: %m\n");
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if (handler_run != 1)
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FAIL_RET ("handler did not run\n");
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for (void *p = stack_buffer; p < stack_bottom; ++p)
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if (*(unsigned char *) p != 0xCC)
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FAIL_RET ("changed byte %ld bytes below configured stack\n",
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(long) (stack_bottom - p));
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for (void *p = stack_top; p < stack_end; ++p)
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if (*(unsigned char *) p != 0xCC)
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FAIL_RET ("changed byte %ld bytes above configured stack\n",
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(long) (p - stack_top));
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free (stack_buffer);
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return 0;
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}
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#include <support/test-driver.c>
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