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103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/* Test freopen in chroot.
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Copyright (C) 2024 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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<https://www.gnu.org/licenses/>. */
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#include <mcheck.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <support/file_contents.h>
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#include <support/namespace.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/xstdio.h>
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#include <support/xunistd.h>
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int
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do_test (void)
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{
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mtrace ();
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char *temp_dir;
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FILE *fp;
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int ret;
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/* These chroot tests verify that either reopening a renamed or
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deleted file works even in the absence of /proc, or that it fails
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(without memory leaks); thus, for example, such reopening does
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not crash in the absence of /proc. */
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support_become_root ();
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if (!support_can_chroot ())
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return EXIT_UNSUPPORTED;
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temp_dir = support_create_temp_directory ("tst-freopen4");
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xchroot (temp_dir);
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/* Test freopen with NULL, renamed file. This verifies that
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reopening succeeds (and resets the file position indicator to
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start of file) even when the original path could no longer be
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opened, or fails without a memory leak. (It is not possible to
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use <support/descriptors.h> to test for file descriptor leaks
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here, because that also depends on /proc.) */
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verbose_printf ("testing freopen with NULL, renamed file\n");
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fp = xfopen ("/file1", "w+");
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ret = fputs ("file has been renamed", fp);
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TEST_VERIFY (ret >= 0);
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ret = rename ("/file1", "/file1a");
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TEST_COMPARE (ret, 0);
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fp = FREOPEN (NULL, "r+", fp);
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if (fp != NULL)
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{
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puts ("freopen of renamed file succeeded");
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TEST_COMPARE_FILE_STRING (fp, "file has been renamed");
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xfclose (fp);
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}
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else
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puts ("freopen of renamed file failed (OK)");
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ret = rename ("/file1a", "/file1");
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TEST_COMPARE (ret, 0);
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/* Test freopen with NULL, deleted file. This verifies that
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reopening succeeds (and resets the file position indicator to
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start of file) even when the original path could no longer be
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opened, or fails without a memory leak. */
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verbose_printf ("testing freopen with NULL, deleted file\n");
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fp = xfopen ("/file1", "r+");
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ret = fputs ("file has now been deleted", fp);
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TEST_VERIFY (ret >= 0);
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ret = remove ("/file1");
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TEST_COMPARE (ret, 0);
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fp = FREOPEN (NULL, "r+", fp);
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if (fp != NULL)
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{
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puts ("freopen of deleted file succeeded");
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TEST_COMPARE_FILE_STRING (fp, "file has now been deleted");
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xfclose (fp);
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}
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else
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puts ("freopen of deleted file failed (OK)");
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free (temp_dir);
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return 0;
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}
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#include <support/test-driver.c>
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