122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
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/* Test backtrace and backtrace_symbols for signal frames.
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Copyright (C) 2011-2022 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 <execinfo.h>
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#include <search.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <unistd.h>
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#include "tst-backtrace.h"
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/* The backtrace should include at least handle_signal, a signal
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trampoline, 3 * fn, and do_test. */
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#define NUM_FUNCTIONS 6
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volatile int sig_handled = 0;
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void
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handle_signal (int signum)
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{
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void *addresses[NUM_FUNCTIONS];
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char **symbols;
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int n;
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int i;
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sig_handled = 1;
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/* Get the backtrace addresses. */
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n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0]));
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printf ("Obtained backtrace with %d functions (want at least %d)\n",
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n, NUM_FUNCTIONS);
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/* Check that there are at least NUM_FUNCTIONS functions. */
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if (n < NUM_FUNCTIONS)
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{
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FAIL ();
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/* Only return if we got no symbols at all. The partial output is
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still useful for debugging failures. */
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if (n <= 0)
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return;
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}
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/* Convert them to symbols. */
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symbols = backtrace_symbols (addresses, n);
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/* Check that symbols were obtained. */
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if (symbols == NULL)
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{
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FAIL ();
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return;
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}
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for (i = 0; i < n; ++i)
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printf ("Function %d: %s\n", i, symbols[i]);
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/* Check that the function names obtained are accurate. */
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if (!match (symbols[0], "handle_signal"))
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FAIL ();
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/* Do not check name for signal trampoline. */
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for (i = 2; i < n - 1; i++)
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if (!match (symbols[i], "fn"))
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{
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FAIL ();
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return;
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}
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/* Symbol names are not available for static functions, so we do not
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check do_test. */
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}
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NO_INLINE int
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fn (int c)
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{
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pid_t parent_pid, child_pid;
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if (c > 0)
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{
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fn (c - 1);
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return x;
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}
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signal (SIGUSR1, handle_signal);
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parent_pid = getpid ();
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child_pid = fork ();
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if (child_pid == (pid_t) -1)
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abort ();
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else if (child_pid == 0)
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{
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sleep (1);
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kill (parent_pid, SIGUSR1);
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_exit (0);
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}
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/* In the parent. */
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while (sig_handled == 0)
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;
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return 0;
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}
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NO_INLINE int
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do_test (void)
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{
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fn (2);
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return ret;
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}
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#include <support/test-driver.c>
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