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      1 // RUN: %clangxx_msan -O0 -g %s -o %t && %run %t
      2 // RUN: %clangxx_msan -O3 -g %s -o %t && %run %t
      3 
      4 #include <assert.h>
      5 #include <stdlib.h>
      6 #include <sys/ioctl.h>
      7 #include <sys/socket.h>
      8 #include <unistd.h>
      9 
     10 int main(int argc, char **argv) {
     11   int fd = socket(AF_INET, SOCK_DGRAM, 0);
     12 
     13   unsigned int z;
     14   int res = ioctl(fd, FIOGETOWN, &z);
     15   assert(res == 0);
     16   close(fd);
     17   if (z)
     18     exit(0);
     19   return 0;
     20 }
     21