nss/nss_test_errno.c

   1 /* NSS service provider with errno clobber.
   2    Copyright (C) 2022 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 }