diff options
Diffstat (limited to 'login/tst-updwtmpx.c')
| -rw-r--r-- | login/tst-updwtmpx.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/login/tst-updwtmpx.c b/login/tst-updwtmpx.c new file mode 100644 index 0000000000..0a4a27daeb --- /dev/null +++ b/login/tst-updwtmpx.c @@ -0,0 +1,112 @@ +/* Basic test coverage for updwtmpx. + Copyright (C) 2019 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; see the file COPYING.LIB. If + not, see <http://www.gnu.org/licenses/>. */ + +/* This program runs a series of tests. Each one calls updwtmpx + twice, to write two records, optionally with misalignment in the + file, and reads back the results. */ + +#include <errno.h> +#include <stdlib.h> +#include <support/check.h> +#include <support/descriptors.h> +#include <support/support.h> +#include <support/temp_file.h> +#include <support/test-driver.h> +#include <support/xunistd.h> +#include <unistd.h> +#include <utmpx.h> + +static int +do_test (void) +{ + /* Two entries filled with an arbitrary bit pattern. */ + struct utmpx entries[2]; + unsigned char pad; + { + unsigned char *p = (unsigned char *) &entries[0]; + for (size_t i = 0; i < sizeof (entries); ++i) + { + p[i] = i; + } + /* Make sure that the first and second entry and the padding are + different. */ + p[sizeof (struct utmpx)] = p[0] + 1; + pad = p[0] + 2; + } + + char *path; + int fd = create_temp_file ("tst-updwtmpx-", &path); + + /* Used to check that updwtmpx does not leave an open file + descriptor around. */ + struct support_descriptors *descriptors = support_descriptors_list (); + + /* updwtmpx is expected to remove misalignment. Optionally insert + one byte of misalignment at the start and in the middle (after + the first entry). */ + for (int misaligned_start = 0; misaligned_start < 2; ++misaligned_start) + for (int misaligned_middle = 0; misaligned_middle < 2; ++misaligned_middle) + { + if (test_verbose > 0) + printf ("info: misaligned_start=%d misaligned_middle=%d\n", + misaligned_start, misaligned_middle); + + xftruncate (fd, 0); + TEST_COMPARE (pwrite64 (fd, &pad, misaligned_start, 0), + misaligned_start); + + /* Write first entry and check it. */ + errno = 0; + updwtmpx (path, &entries[0]); + TEST_COMPARE (errno, 0); + support_descriptors_check (descriptors); + TEST_COMPARE (xlseek (fd, 0, SEEK_END), sizeof (struct utmpx)); + struct utmpx buffer; + TEST_COMPARE (pread64 (fd, &buffer, sizeof (buffer), 0), + sizeof (buffer)); + TEST_COMPARE_BLOB (&entries[0], sizeof (entries[0]), + &buffer, sizeof (buffer)); + + /* Middle mis-alignmet. */ + TEST_COMPARE (pwrite64 (fd, &pad, misaligned_middle, + sizeof (struct utmpx)), misaligned_middle); + + /* Write second entry and check both entries. */ + errno = 0; + updwtmpx (path, &entries[1]); + TEST_COMPARE (errno, 0); + support_descriptors_check (descriptors); + TEST_COMPARE (xlseek (fd, 0, SEEK_END), 2 * sizeof (struct utmpx)); + TEST_COMPARE (pread64 (fd, &buffer, sizeof (buffer), 0), + sizeof (buffer)); + TEST_COMPARE_BLOB (&entries[0], sizeof (entries[0]), + &buffer, sizeof (buffer)); + TEST_COMPARE (pread64 (fd, &buffer, sizeof (buffer), sizeof (buffer)), + sizeof (buffer)); + TEST_COMPARE_BLOB (&entries[1], sizeof (entries[1]), + &buffer, sizeof (buffer)); + } + + support_descriptors_free (descriptors); + free (path); + xclose (fd); + + return 0; +} + +#include <support/test-driver.c> |