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authorJoseph Myers <joseph@codesourcery.com>2013-01-18 15:49:43 +0000
committerJoseph Myers <joseph@codesourcery.com>2013-01-18 15:49:43 +0000
commit31d470ac2498da0ba6d54ea0c6f1cf57740809e5 (patch)
treebbd7b80adf49e3a328f5b07670b7cb12af2c0262 /debug/tst-backtrace4.c
parent90567f30eb334328ae6e2b7901df539f1ba61921 (diff)
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Add tests that backtrace and backtrace_symbols produce correct results.
Diffstat (limited to 'debug/tst-backtrace4.c')
-rw-r--r--debug/tst-backtrace4.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/debug/tst-backtrace4.c b/debug/tst-backtrace4.c
new file mode 100644
index 0000000..41a3f51
--- /dev/null
+++ b/debug/tst-backtrace4.c
@@ -0,0 +1,134 @@
+/* Test backtrace and backtrace_symbols for signal frames.
+ Copyright (C) 2011-2013 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <execinfo.h>
+#include <search.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <signal.h>
+#include <unistd.h>
+
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
+
+/* Set to a non-zero value if the test fails. */
+volatile int ret;
+
+/* Accesses to X are used to prevent optimization. */
+volatile int x;
+
+/* Called if the test fails. */
+#define FAIL() \
+ do { printf ("Failure on line %d\n", __LINE__); ret = 1; } while (0)
+
+/* The backtrace should include at least handle_signal, a signal
+ trampoline, 3 * fn, and do_test. */
+#define NUM_FUNCTIONS 6
+
+/* Use this attribute to prevent inlining, so that all expected frames
+ are present. */
+#define NO_INLINE __attribute__ ((noinline))
+
+volatile int sig_handled = 0;
+
+void
+handle_signal (int signum)
+{
+ void *addresses[NUM_FUNCTIONS];
+ char **symbols;
+ int n;
+ int i;
+
+ sig_handled = 1;
+
+ /* Get the backtrace addresses. */
+ n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0]));
+ printf ("Obtained backtrace with %d functions\n", n);
+ /* Check that there are at least six functions. */
+ if (n < NUM_FUNCTIONS)
+ {
+ FAIL ();
+ return;
+ }
+ /* Convert them to symbols. */
+ symbols = backtrace_symbols (addresses, n);
+ /* Check that symbols were obtained. */
+ if (symbols == NULL)
+ {
+ FAIL ();
+ return;
+ }
+ for (i = 0; i < n; ++i)
+ printf ("Function %d: %s\n", i, symbols[i]);
+ /* Check that the function names obtained are accurate. */
+ if (strstr (symbols[0], "handle_signal") == NULL)
+ {
+ FAIL ();
+ return;
+ }
+ /* Do not check name for signal trampoline. */
+ for (i = 2; i < n - 1; i++)
+ if (strstr (symbols[i], "fn") == NULL)
+ {
+ FAIL ();
+ return;
+ }
+ /* Symbol names are not available for static functions, so we do not
+ check do_test. */
+}
+
+NO_INLINE int
+fn (int c)
+{
+ pid_t parent_pid, child_pid;
+
+ if (c > 0)
+ {
+ fn (c - 1);
+ return x;
+ }
+
+ signal (SIGUSR1, handle_signal);
+ parent_pid = getpid ();
+
+ child_pid = fork ();
+ if (child_pid == (pid_t) -1)
+ abort ();
+ else if (child_pid == 0)
+ {
+ sleep (1);
+ kill (parent_pid, SIGUSR1);
+ _exit (0);
+ }
+
+ /* In the parent. */
+ while (sig_handled == 0)
+ ;
+
+ return 0;
+}
+
+NO_INLINE static int
+do_test (void)
+{
+ fn (2);
+ return ret;
+}