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/* Test for endgrent changing errno for BZ #24696
Copyright (C) 2019-2021 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 <stdlib.h>
#include <sys/types.h>
#include <grp.h>
#include <unistd.h>
#include <errno.h>
#include <support/check.h>
#include <support/support.h>
/* The following test verifies that if the db NSS Service is initialized
with no database (getgrent), that a subsequent closure (endgrent) does
not set errno. In the case of the db service it is not an error to close
the service and so it should not set errno. */
static int
do_test (void)
{
/* Just make sure it's not there, although usually it won't be. */
unlink ("/var/db/group.db");
/* This, in conjunction with the testroot's nsswitch.conf, causes
the nss_db module to be "connected" and initialized - but the
testroot has no group.db, so no mapping will be created. */
getgrent ();
errno = 0;
/* Before the fix, this would call munmap (NULL) and set errno. */
endgrent ();
if (errno != 0)
FAIL_EXIT1 ("endgrent set errno to %d\n", errno);
return 0;
}
#include <support/test-driver.c>
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