1  /* NSS service provider with errno clobber.
       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 <errno.h>
      20  #include <nss.h>
      21  #include <stdlib.h>
      22  
      23  /* Catch misnamed and functions.  */
      24  #pragma GCC diagnostic error "-Wmissing-prototypes"
      25  NSS_DECLARE_MODULE_FUNCTIONS (test_errno)
      26  
      27  static void __attribute__ ((constructor))
      28  init (void)
      29  {
      30    /* An arbitrary error code which is otherwise not used.  */
      31    errno = -1009;
      32  }
      33  
      34  /* Lookup functions for pwd follow that do not return any data.  */
      35  
      36  /* Catch misnamed function definitions.  */
      37  
      38  enum nss_status
      39  _nss_test_errno_setpwent (int stayopen)
      40  {
      41    setenv ("_nss_test_errno_setpwent", "yes", 1);
      42    return NSS_STATUS_SUCCESS;
      43  }
      44  
      45  enum nss_status
      46  _nss_test_errno_getpwent_r (struct passwd *result,
      47                              char *buffer, size_t size, int *errnop)
      48  {
      49    setenv ("_nss_test_errno_getpwent_r", "yes", 1);
      50    return NSS_STATUS_NOTFOUND;
      51  }
      52  
      53  enum nss_status
      54  _nss_test_errno_endpwent (void)
      55  {
      56    setenv ("_nss_test_errno_endpwent", "yes", 1);
      57    return NSS_STATUS_SUCCESS;
      58  }