1 files changed, 58 insertions, 0 deletions
diff --git a/nss/nss_test_errno.c b/nss/nss_test_errno.c
new file mode 100644
index 0000000000..680f8a07b9
--- /dev/null
+++ b/nss/nss_test_errno.c
@@ -0,0 +1,58 @@
+/* NSS service provider with errno clobber.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <nss.h>
+#include <stdlib.h>
+
+/* Catch misnamed and functions.  */
+#pragma GCC diagnostic error "-Wmissing-prototypes"
+NSS_DECLARE_MODULE_FUNCTIONS (test_errno)
+
+static void __attribute__ ((constructor))
+init (void)
+{
+  /* An arbitrary error code which is otherwise not used.  */
+  errno = ELIBBAD;
+}
+
+/* Lookup functions for pwd follow that do not return any data.  */
+
+/* Catch misnamed function definitions.  */
+
+enum nss_status
+_nss_test_errno_setpwent (int stayopen)
+{
+  setenv ("_nss_test_errno_setpwent", "yes", 1);
+  return NSS_STATUS_SUCCESS;
+}
+
+enum nss_status
+_nss_test_errno_getpwent_r (struct passwd *result,
+                            char *buffer, size_t size, int *errnop)
+{
+  setenv ("_nss_test_errno_getpwent_r", "yes", 1);
+  return NSS_STATUS_NOTFOUND;
+}
+
+enum nss_status
+_nss_test_errno_endpwent (void)
+{
+  setenv ("_nss_test_errno_endpwent", "yes", 1);
+  return NSS_STATUS_SUCCESS;
+}