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@@ -0,0 +1,110 @@
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+/* Copyright (c) 2012-2013, The Tor Project, Inc. */
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+/* See LICENSE for licensing information */
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+
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+#include "orconfig.h"
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+#include <stdio.h>
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+#include <stdlib.h>
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+
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+#include "or.h"
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+#include "util.h"
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+#include "backtrace.h"
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+#include "torlog.h"
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+
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+
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+/* -1: no crash.
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+ * 0: crash with a segmentation fault.
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+ * 1x: crash with an assertion failure. */
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+static int crashtype = 0;
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+
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+#ifdef __GNUC__
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+#define NOINLINE __attribute__((noinline))
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+#define NORETURN __attribute__((noreturn))
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+#endif
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+
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+int crash(int x) NOINLINE;
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+int oh_what(int x) NOINLINE;
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+int a_tangled_web(int x) NOINLINE;
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+int we_weave(int x) NOINLINE;
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+static void abort_handler(int s) NORETURN;
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+
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+int
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+crash(int x)
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+{
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+ if (crashtype == 0) {
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+ *(volatile int *)0 = 0;
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+ } else if (crashtype == 1) {
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+ tor_assert(1 == 0);
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+ } else if (crashtype == -1) {
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+ ;
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+ }
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+
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+ crashtype *= x;
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+ return crashtype;
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+}
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+
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+int
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+oh_what(int x)
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+{
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+ /* We call crash() twice here, so that the compiler won't try to do a
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+ * tail-call optimization. Only the first call will actually happen, but
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+ * telling the compiler to maybe do the second call will prevent it from
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+ * replacing the first call with a jump. */
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+ return crash(x) + crash(x*2);
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+}
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+
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+int
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+a_tangled_web(int x)
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+{
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+ return oh_what(x) * 99 + oh_what(x);
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+}
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+
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+int
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+we_weave(int x)
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+{
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+ return a_tangled_web(x) + a_tangled_web(x+1);
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+}
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+
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+static void
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+abort_handler(int s)
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+{
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+ (void)s;
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+ exit(0);
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+}
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+
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+int
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+main(int argc, char **argv)
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+{
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+ log_severity_list_t severity;
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+
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+ if (argc < 2) {
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+ puts("I take an argument. It should be \"assert\" or \"crash\" or "
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+ "\"none\"");
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+ return 1;
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+ }
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+ if (!strcmp(argv[1], "assert")) {
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+ crashtype = 1;
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+ } else if (!strcmp(argv[1], "crash")) {
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+ crashtype = 0;
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+ } else if (!strcmp(argv[1], "none")) {
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+ crashtype = -1;
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+ } else {
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+ puts("Argument should be \"assert\" or \"crash\" or \"none\"");
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+ return 1;
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+ }
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+
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+ init_logging();
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+ set_log_severity_config(LOG_WARN, LOG_ERR, &severity);
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+ add_stream_log(&severity, "stdout", STDOUT_FILENO);
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+ tor_log_update_sigsafe_err_fds();
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+
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+ configure_backtrace_handler(NULL);
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+
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+ signal(SIGABRT, abort_handler);
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+
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+ printf("%d\n", we_weave(2));
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+
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+ clean_up_backtrace_handler();
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+
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+ return 0;
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+}
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+
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