1  /* Test derived from Glibc's getifaddrs_internal.   The code could be
       2     rewritten to avoid the warning for the memcpy call but since unions
       3     are designed to have their members treated as interchangeable there
       4     isn't a whole lot to be gained from issuing one.
       5     { dg-do compile }
       6     { dg-options "-O2 -Wall" } */
       7  
       8  typedef __SIZE_TYPE__ size_t;
       9  
      10  extern void* memcpy (void*, const void*, size_t);
      11  
      12  struct sockaddr
      13  {
      14    short sa_family;
      15    char sa_data[14];
      16  };
      17  
      18  struct in_addr
      19  {
      20    int s_addr;
      21  };
      22  
      23  struct in6_addr
      24  {
      25    union
      26    {
      27      char __u6_addr8[16];
      28      short __u6_addr16[8];
      29      int __u6_addr32[4];
      30    } __in6_u;
      31  };
      32  
      33  struct sockaddr_in
      34  {
      35    short sin_family;
      36    short sin_port;
      37    struct in_addr sin_addr;
      38    unsigned char sin_zero[sizeof (struct sockaddr) -
      39  			 (sizeof (short)) -
      40  			 sizeof (short) -
      41  			 sizeof (struct in_addr)];
      42  };
      43  
      44  struct sockaddr_in6
      45  {
      46    short sin6_family;
      47    short sin6_port;
      48    int sin6_flowinfo;
      49    struct in6_addr sin6_addr;
      50    int sin6_scope_id;
      51  };
      52  
      53  union
      54  {
      55    struct sockaddr sa;
      56    struct sockaddr_in s4;
      57    struct sockaddr_in6 s6;
      58  } u1, u2;
      59  
      60  struct sockaddr *sa;
      61  
      62  void test_unconditional (void *p)
      63  {
      64    sa = &u1.sa;
      65    memcpy (&((struct sockaddr_in6 *) sa)->sin6_addr, p, 16);
      66  }
      67  
      68  void test_conditional (void *p, int i)
      69  {
      70    sa = i ? &u1.sa : &u2.sa;
      71    memcpy (&((struct sockaddr_in6 *) sa)->sin6_addr, p, 16);
      72  }