compiler-rt/test/sanitizer_common/TestCases/Linux/signal_trap_handler.cpp

   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: target=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 }