// Regression test for
// https://code.google.com/p/address-sanitizer/issues/detail?id=180

// FIXME: Implement.
// XFAIL: hwasan

// RUN: %clangxx -O0 %s -o %t

// RUN: %env_tool_opts=handle_segv=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK0
// RUN: %env_tool_opts=handle_segv=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK1
// RUN: %env_tool_opts=handle_segv=2 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK2

// RUN: %env_tool_opts=handle_segv=0:allow_user_segv_handler=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK0
// RUN: %env_tool_opts=handle_segv=1:allow_user_segv_handler=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK2
// RUN: %env_tool_opts=handle_segv=2:allow_user_segv_handler=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK2

// RUN: %env_tool_opts=handle_segv=0:allow_user_segv_handler=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK0
// RUN: %env_tool_opts=handle_segv=1:allow_user_segv_handler=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK1
// RUN: %env_tool_opts=handle_segv=2:allow_user_segv_handler=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK2

// Flaky errors in debuggerd with "waitpid returned unexpected pid (0)" in logcat.
// UNSUPPORTED: android && i386-target-arch

// Note: this test case is unusual because it retrieves the original
// (ASan-installed) signal handler; thus, it is incompatible with the
// cloak_sanitizer_signal_handlers runtime option.

#include <signal.h>
#include <stdio.h>
#include <stdlib.h>

struct sigaction original_sigaction_sigsegv;

void User_OnSIGSEGV(int signum, siginfo_t *siginfo, void *context) {
  fprintf(stderr, "User sigaction called\n");
  struct sigaction original_sigaction = {};
  if (signum == SIGSEGV)
    original_sigaction = original_sigaction_sigsegv;
  else {
    printf("Invalid signum");
    exit(1);
  }
  if (original_sigaction.sa_flags | SA_SIGINFO) {
    if (original_sigaction.sa_sigaction)
      original_sigaction.sa_sigaction(signum, siginfo, context);
  } else {
    if (original_sigaction.sa_handler)
      original_sigaction.sa_handler(signum);
  }
  exit(1);
}

bool InstallHandler(int signum, struct sigaction *original_sigaction) {
  struct sigaction user_sigaction = {};
  user_sigaction.sa_sigaction = User_OnSIGSEGV;
  user_sigaction.sa_flags = SA_SIGINFO;
  if (sigaction(signum, &user_sigaction, original_sigaction)) {
    perror("sigaction");
    return false;
  }
  return true;
}

int main() {
  if (InstallHandler(SIGSEGV, &original_sigaction_sigsegv))
    fprintf(stderr, "User sigaction installed\n");

  // Trying to organically segfault by dereferencing a pointer can be tricky
  // when the sanitizer runtime is built with assertions. Additionally, some
  // older platforms may SIGBUS instead.
  raise(SIGSEGV);

  return 0;
}

// CHECK0-NOT: Sanitizer:DEADLYSIGNAL
// CHECK0-NOT: Sanitizer: SEGV on unknown address
// CHECK0: User sigaction installed
// CHECK0-NEXT: User sigaction called

// CHECK1: User sigaction installed
// CHECK1-NEXT: User sigaction called
// CHECK1-NEXT: Sanitizer:DEADLYSIGNAL
// CHECK1: Sanitizer: SEGV on unknown address

// CHECK2-NOT: User sigaction called
// CHECK2: User sigaction installed
// CHECK2-NEXT: Sanitizer:DEADLYSIGNAL
// CHECK2: Sanitizer: SEGV on unknown address