1 // RUN: %clangxx -O1 %s -o %t && %env_tool_opts=handle_sigtrap=1 %run %t 2>&1 | FileCheck %s
2 
3 // __builtin_debugtrap() does not raise SIGTRAP on these platforms.
4 // UNSUPPORTED: s390
5 
6 #include <assert.h>
7 #include <signal.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 
11 int in_handler;
12 
13 void handler(int signo, siginfo_t *info, void *uctx) {
14   fprintf(stderr, "in_handler: %d\n", in_handler);
15   fflush(stderr);
16   // CHECK: in_handler: 1
17   _Exit(0);
18 }
19 
20 int main() {
21   struct sigaction a = {}, old = {};
22   a.sa_sigaction = handler;
23   a.sa_flags = SA_SIGINFO;
24   sigaction(SIGTRAP, &a, &old);
25 
26   a = {};
27   sigaction(SIGTRAP, 0, &a);
28   assert(a.sa_sigaction == handler);
29   assert(a.sa_flags & SA_SIGINFO);
30 
31   in_handler = 1;
32   // Check that signal handler is not postponed by sanitizer.
33   // Don't use raise here as it calls any signal handler immediately.
34   __builtin_debugtrap();
35   in_handler = 0;
36 
37   fprintf(stderr, "UNREACHABLE\n");
38   return 1;
39 }
40