113 lines
4.0 KiB
C
113 lines
4.0 KiB
C
/* Basic test coverage for updwtmpx.
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Copyright (C) 2019-2022 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 License as
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published by the Free Software Foundation; either version 2.1 of the
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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; see the file COPYING.LIB. If
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not, see <https://www.gnu.org/licenses/>. */
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/* This program runs a series of tests. Each one calls updwtmpx
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twice, to write two records, optionally with misalignment in the
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file, and reads back the results. */
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#include <errno.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <support/descriptors.h>
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#include <support/support.h>
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#include <support/temp_file.h>
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#include <support/test-driver.h>
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#include <support/xunistd.h>
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#include <unistd.h>
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#include <utmpx.h>
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static int
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do_test (void)
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{
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/* Two entries filled with an arbitrary bit pattern. */
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struct utmpx entries[2];
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unsigned char pad;
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{
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unsigned char *p = (unsigned char *) &entries[0];
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for (size_t i = 0; i < sizeof (entries); ++i)
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{
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p[i] = i;
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}
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/* Make sure that the first and second entry and the padding are
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different. */
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p[sizeof (struct utmpx)] = p[0] + 1;
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pad = p[0] + 2;
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}
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char *path;
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int fd = create_temp_file ("tst-updwtmpx-", &path);
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/* Used to check that updwtmpx does not leave an open file
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descriptor around. */
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struct support_descriptors *descriptors = support_descriptors_list ();
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/* updwtmpx is expected to remove misalignment. Optionally insert
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one byte of misalignment at the start and in the middle (after
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the first entry). */
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for (int misaligned_start = 0; misaligned_start < 2; ++misaligned_start)
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for (int misaligned_middle = 0; misaligned_middle < 2; ++misaligned_middle)
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{
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if (test_verbose > 0)
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printf ("info: misaligned_start=%d misaligned_middle=%d\n",
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misaligned_start, misaligned_middle);
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xftruncate (fd, 0);
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TEST_COMPARE (pwrite64 (fd, &pad, misaligned_start, 0),
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misaligned_start);
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/* Write first entry and check it. */
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errno = 0;
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updwtmpx (path, &entries[0]);
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TEST_COMPARE (errno, 0);
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support_descriptors_check (descriptors);
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TEST_COMPARE (xlseek (fd, 0, SEEK_END), sizeof (struct utmpx));
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struct utmpx buffer;
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TEST_COMPARE (pread64 (fd, &buffer, sizeof (buffer), 0),
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sizeof (buffer));
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TEST_COMPARE_BLOB (&entries[0], sizeof (entries[0]),
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&buffer, sizeof (buffer));
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/* Middle mis-alignmet. */
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TEST_COMPARE (pwrite64 (fd, &pad, misaligned_middle,
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sizeof (struct utmpx)), misaligned_middle);
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/* Write second entry and check both entries. */
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errno = 0;
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updwtmpx (path, &entries[1]);
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TEST_COMPARE (errno, 0);
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support_descriptors_check (descriptors);
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TEST_COMPARE (xlseek (fd, 0, SEEK_END), 2 * sizeof (struct utmpx));
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TEST_COMPARE (pread64 (fd, &buffer, sizeof (buffer), 0),
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sizeof (buffer));
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TEST_COMPARE_BLOB (&entries[0], sizeof (entries[0]),
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&buffer, sizeof (buffer));
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TEST_COMPARE (pread64 (fd, &buffer, sizeof (buffer), sizeof (buffer)),
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sizeof (buffer));
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TEST_COMPARE_BLOB (&entries[1], sizeof (entries[1]),
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&buffer, sizeof (buffer));
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}
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support_descriptors_free (descriptors);
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free (path);
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xclose (fd);
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return 0;
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}
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#include <support/test-driver.c>
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