1  /* Test ancillary data header creation.
       2     Copyright (C) 2022-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <sys/socket.h>
      20  #include <gnu/lib-names.h>
      21  #include <support/xdlfcn.h>
      22  #include <support/check.h>
      23  
      24  #define PAYLOAD "Hello, World!"
      25  
      26  /* CMSG_NXTHDR is a macro that calls an inline function defined in
      27     bits/socket.h.  In case the function cannot be inlined, libc.so carries
      28     a copy.  Both versions need to be tested.  */
      29  
      30  #define CMSG_NXTHDR_IMPL CMSG_NXTHDR
      31  #include "tst-cmsghdr-skeleton.c"
      32  #undef CMSG_NXTHDR_IMPL
      33  
      34  static struct cmsghdr * (* cmsg_nxthdr) (struct msghdr *, struct cmsghdr *);
      35  
      36  #define CMSG_NXTHDR_IMPL cmsg_nxthdr
      37  #include "tst-cmsghdr-skeleton.c"
      38  #undef CMSG_NXTHDR_IMPL
      39  
      40  static int
      41  do_test (void)
      42  {
      43    static void *handle;
      44  
      45    run_test_CMSG_NXTHDR ();
      46  
      47    handle = xdlopen (LIBC_SO, RTLD_LAZY);
      48    cmsg_nxthdr = (struct cmsghdr * (*) (struct msghdr *, struct cmsghdr *))
      49                    xdlsym (handle, "__cmsg_nxthdr");
      50  
      51    run_test_cmsg_nxthdr ();
      52  
      53    return 0;
      54  }
      55  
      56  #include <support/test-driver.c>