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99135114ba
nss_db allows for getpwent et al to be called without a set*ent, but it only works once. After the last get*ent a set*ent is required to restart, because the end*ent did not properly reset the module. Resetting it to NULL allows for a proper restart. If the database doesn't exist, however, end*ent erroniously called munmap which set errno. The test case runs "makedb" inside the testroot, so needs selinux DSOs installed.
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/* Test for endgrent changing errno for BZ #24696
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include <sys/types.h>
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#include <grp.h>
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#include <unistd.h>
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#include <errno.h>
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#include <support/check.h>
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#include <support/support.h>
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/* The following test verifies that if the db NSS Service is initialized
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with no database (getgrent), that a subsequent closure (endgrent) does
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not set errno. In the case of the db service it is not an error to close
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the service and so it should not set errno. */
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static int
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do_test (void)
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{
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/* Just make sure it's not there, although usually it won't be. */
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unlink ("/var/db/group.db");
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/* This, in conjunction with the testroot's nsswitch.conf, causes
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the nss_db module to be "connected" and initialized - but the
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testroot has no group.db, so no mapping will be created. */
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getgrent ();
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errno = 0;
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/* Before the fix, this would call munmap (NULL) and set errno. */
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endgrent ();
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if (errno != 0)
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FAIL_EXIT1 ("endgrent set errno to %d\n", errno);
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return 0;
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}
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#include <support/test-driver.c>
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