text: // RUN: %clangxx_asan -O0 -g %s -o %t && ASAN_OPTIONS=$ASAN_OPTIONS:handle_ioctl=1 not %run %t 2>&1 | FileCheck %s
  // RUN: %clangxx_asan -O3 -g %s -o %t && ASAN_OPTIONS=$ASAN_OPTIONS:handle_ioctl=1 not %run %t 2>&1 | FileCheck %s
  
  // RUN: %clangxx_asan -O0 -g %s -o %t && %run %t
  // RUN: %clangxx_asan -O3 -g %s -o %t && %run %t
  
  #include <assert.h>
  #include <stdlib.h>
  #include <sys/ioctl.h>
  #include <sys/socket.h>
  #include <unistd.h>
  
  int main(int argc, char **argv) {
    int fd = socket(AF_INET, SOCK_DGRAM, 0);
  
    int nonblock;
    int res = ioctl(fd, FIONBIO, &nonblock + 1);
    // CHECK: AddressSanitizer: stack-buffer-overflow
    // CHECK: READ of size 4 at
    // CHECK: {{#.* in main .*ioctl.cc:}}[[@LINE-3]]
    assert(res == 0);
    close(fd);
    return 0;
  }
  