mirror of
https://sourceware.org/git/glibc.git
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ed4bb289cf
freopen is rather minimally tested in libio/tst-freopen and
libio/test-freopen. Add some more thorough tests, covering different
cases for change of mode in particular. The tests are run for both
freopen and freopen64 (given that those functions have two separate
copies of much of the code, so any bug fix directly in the freopen
code would probably need applying in both places).
Note that there are two parts of the tests disabled because of bugs
discovered through running the tests, with bug numbers given in
comments. I expect to address those separately. The tests also don't
cover changes to cancellation ("c" in mode); I think that will better
be handled through a separate test. Also to handle separately:
testing on stdin / stdout / stderr; documenting lack of support for
streams opened with popen / fmemopen / open_memstream / fopencookie;
maybe also a chroot test without /proc; maybe also more thorough tests
for large file handling on 32-bit systems (freopen64).
Tested for x86_64.
527 lines
15 KiB
C
527 lines
15 KiB
C
/* Test freopen.
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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 <errno.h>
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#include <fcntl.h>
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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 <wchar.h>
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#include <support/check.h>
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#include <support/descriptors.h>
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#include <support/file_contents.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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#define START_TEST(DESC) \
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do \
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{ \
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fds = support_descriptors_list (); \
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verbose_printf (DESC); \
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} \
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while (0)
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#define END_TEST \
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do \
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{ \
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support_descriptors_check (fds); \
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support_descriptors_free (fds); \
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} \
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while (0)
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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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struct support_descriptors *fds;
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char *temp_dir = support_create_temp_directory ("tst-freopen2");
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char *file1 = xasprintf ("%s/file1", temp_dir);
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support_write_file_string (file1, "file1");
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add_temp_file (file1);
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char *file2 = xasprintf ("%s/file2", temp_dir);
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support_write_file_string (file2, "file2");
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add_temp_file (file2);
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char *file3 = xasprintf ("%s/file3", temp_dir);
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char *file4 = xasprintf ("%s/file4", temp_dir);
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char *file1a = xasprintf ("%s/file1a", temp_dir);
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FILE *fp;
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int ret;
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wint_t wc;
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/* Test each pair of old and new modes from r w a. */
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START_TEST ("Testing r -> r\n");
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fp = xfopen (file1, "r");
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fp = FREOPEN (file2, "r", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "file2");
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xfclose (fp);
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END_TEST;
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START_TEST ("Testing r -> w\n");
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fp = xfopen (file1, "r");
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fp = FREOPEN (file2, "w", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("File2new", fp);
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TEST_VERIFY (ret >= 0);
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file1, "file1");
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "File2new");
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END_TEST;
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START_TEST ("Testing r -> a\n");
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fp = xfopen (file1, "r");
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fp = FREOPEN (file2, "a", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("3", fp);
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TEST_VERIFY (ret >= 0);
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "File2new3");
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END_TEST;
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START_TEST ("Testing w -> r\n");
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fp = xfopen (file1, "w");
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fp = FREOPEN (file2, "r", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "File2new3");
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xfclose (fp);
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END_TEST;
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START_TEST ("Testing w -> w\n");
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fp = xfopen (file1, "w");
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fp = FREOPEN (file2, "w", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("next", fp);
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TEST_VERIFY (ret >= 0);
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file1, "");
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "next");
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END_TEST;
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START_TEST ("Testing w -> a\n");
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fp = xfopen (file1, "w");
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fp = FREOPEN (file2, "a", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("4", fp);
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TEST_VERIFY (ret >= 0);
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "next4");
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END_TEST;
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START_TEST ("Testing a -> r\n");
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fp = xfopen (file1, "a");
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fp = FREOPEN (file2, "r", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "next4");
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xfclose (fp);
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END_TEST;
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START_TEST ("Testing a -> w\n");
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fp = xfopen (file1, "a");
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fp = FREOPEN (file2, "w", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("another", fp);
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TEST_VERIFY (ret >= 0);
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "another");
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END_TEST;
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START_TEST ("Testing a -> a\n");
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fp = xfopen (file1, "a");
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fp = FREOPEN (file2, "a", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("5", fp);
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TEST_VERIFY (ret >= 0);
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "another5");
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END_TEST;
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/* Test for file originally opened with fopen64. */
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START_TEST ("Testing fopen64 a -> a\n");
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fp = fopen64 (file1, "a");
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TEST_VERIFY_EXIT (fp != NULL);
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fp = FREOPEN (file2, "a", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("64", fp);
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TEST_VERIFY (ret >= 0);
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "another564");
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END_TEST;
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/* Test calling freopen more than once on the same FILE *. */
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START_TEST ("Testing r -> w -> r\n");
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fp = xfopen (file1, "r");
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fp = FREOPEN (file2, "w", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("freopen-twice", fp);
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TEST_VERIFY (ret >= 0);
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fp = FREOPEN (file2, "r", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "freopen-twice");
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "freopen-twice");
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END_TEST;
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START_TEST ("Testing r -> w -> r (exactly one freopen64)\n");
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fp = xfopen (file1, "r");
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fp = OTHER_FREOPEN (file2, "w", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("freopen-twice64", fp);
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TEST_VERIFY (ret >= 0);
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fp = FREOPEN (file2, "r", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "freopen-twice64");
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "freopen-twice64");
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END_TEST;
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/* Test changing to/from b (binary, no-op). */
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START_TEST ("Testing rb -> r\n");
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fp = xfopen (file1, "rb");
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fp = FREOPEN (file2, "r", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "freopen-twice64");
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xfclose (fp);
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END_TEST;
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START_TEST ("Testing r -> rb\n");
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fp = xfopen (file1, "r");
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fp = FREOPEN (file2, "rb", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "freopen-twice64");
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xfclose (fp);
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END_TEST;
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/* Test changing to/from + (read-and-write). */
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START_TEST ("Testing r -> w+\n");
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fp = xfopen (file1, "r");
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fp = FREOPEN (file2, "w+", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("latest", fp);
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TEST_VERIFY (ret >= 0);
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ret = fseek (fp, 0, SEEK_SET);
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TEST_COMPARE (ret, 0);
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TEST_COMPARE_FILE_STRING (fp, "latest");
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "latest");
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END_TEST;
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START_TEST ("Testing w -> a+\n");
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fp = xfopen (file1, "w");
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fp = FREOPEN (file2, "a+", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("suffix", fp);
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TEST_VERIFY (ret >= 0);
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ret = fseek (fp, 0, SEEK_SET);
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TEST_COMPARE (ret, 0);
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TEST_COMPARE_FILE_STRING (fp, "latestsuffix");
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "latestsuffix");
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END_TEST;
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START_TEST ("Testing a -> r+\n");
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fp = xfopen (file1, "a");
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fp = FREOPEN (file2, "r+", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "latestsuffix");
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ret = fseek (fp, 0, SEEK_SET);
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TEST_COMPARE (ret, 0);
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ret = fputs ("new", fp);
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TEST_VERIFY (ret >= 0);
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "newestsuffix");
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END_TEST;
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START_TEST ("Testing r+ -> w\n");
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fp = xfopen (file1, "r+");
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fp = FREOPEN (file2, "w", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("plusto", fp);
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TEST_VERIFY (ret >= 0);
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ret = fseek (fp, 0, SEEK_SET);
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TEST_COMPARE (ret, 0);
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errno = 0;
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TEST_COMPARE (fgetc (fp), EOF);
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TEST_COMPARE (errno, EBADF);
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clearerr (fp);
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "plusto");
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END_TEST;
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START_TEST ("Testing w+ -> a\n");
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fp = xfopen (file1, "w+");
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fp = FREOPEN (file2, "a", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("more", fp);
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TEST_VERIFY (ret >= 0);
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ret = fseek (fp, 0, SEEK_SET);
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TEST_COMPARE (ret, 0);
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errno = 0;
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TEST_COMPARE (fgetc (fp), EOF);
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TEST_COMPARE (errno, EBADF);
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clearerr (fp);
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "plustomore");
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END_TEST;
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START_TEST ("Testing a+ -> r\n");
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fp = xfopen (file1, "a+");
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fp = FREOPEN (file2, "rr", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "plustomore");
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ret = fputs ("2", fp);
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TEST_COMPARE (ret, EOF);
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clearerr (fp);
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "plustomore");
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END_TEST;
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/* Test changing to/from e (FD_CLOEXEC). */
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START_TEST ("Testing re -> r\n");
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fp = xfopen (file1, "re");
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ret = fcntl (fileno (fp), F_GETFD);
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TEST_VERIFY (ret != -1);
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TEST_COMPARE (ret & FD_CLOEXEC, FD_CLOEXEC);
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fp = FREOPEN (file2, "r", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fcntl (fileno (fp), F_GETFD);
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TEST_VERIFY (ret != -1);
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#if 0 /* Fails to clear FD_CLOEXEC (bug 32134). */
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TEST_COMPARE (ret & FD_CLOEXEC, 0);
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#endif
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TEST_COMPARE_FILE_STRING (fp, "plustomore");
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xfclose (fp);
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END_TEST;
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START_TEST ("Testing r -> re\n");
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fp = xfopen (file1, "r");
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ret = fcntl (fileno (fp), F_GETFD);
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TEST_VERIFY (ret != -1);
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TEST_COMPARE (ret & FD_CLOEXEC, 0);
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fp = FREOPEN (file2, "re", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fcntl (fileno (fp), F_GETFD);
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TEST_VERIFY (ret != -1);
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TEST_COMPARE (ret & FD_CLOEXEC, FD_CLOEXEC);
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TEST_COMPARE_FILE_STRING (fp, "plustomore");
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xfclose (fp);
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END_TEST;
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/* Test changing to/from m (mmap) (a no-op as far as testing
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semantics is concerned). */
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START_TEST ("Testing rm -> r\n");
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fp = xfopen (file1, "rm");
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fp = FREOPEN (file2, "r", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "plustomore");
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xfclose (fp);
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END_TEST;
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START_TEST ("Testing r -> rm\n");
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fp = xfopen (file1, "r");
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fp = FREOPEN (file2, "rm", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "plustomore");
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xfclose (fp);
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END_TEST;
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/* Test changing to/from x (O_EXCL). */
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START_TEST ("Testing wx -> w\n");
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fp = xfopen (file3, "wx");
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add_temp_file (file3);
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fp = FREOPEN (file2, "w", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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ret = fputs ("wxtow", fp);
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TEST_VERIFY (ret >= 0);
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "wxtow");
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END_TEST;
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START_TEST ("Testing w -> wx (file does not exist)\n");
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fp = xfopen (file1, "w");
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fp = FREOPEN (file4, "wx", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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add_temp_file (file4);
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ret = fputs ("wtowx", fp);
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TEST_VERIFY (ret >= 0);
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xfclose (fp);
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TEST_OPEN_AND_COMPARE_FILE_STRING (file4, "wtowx");
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END_TEST;
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/* Test with ,ccs=CHARSET. */
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START_TEST ("testing w,ccs=utf-8 -> r\n");
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fp = xfopen (file1, "w,ccs=utf-8");
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ret = fputws (L"\xc0\xc1", fp);
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TEST_VERIFY (ret >= 0);
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fp = FREOPEN (file2, "r", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "wxtow");
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xfclose (fp);
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END_TEST;
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START_TEST ("testing w,ccs=iso-8859-1 -> r,ccs=utf-8\n");
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fp = xfopen (file2, "w,ccs=iso-8859-1");
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ret = fputws (L"\xc0\xc1", fp);
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TEST_VERIFY (ret >= 0);
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#if 0 /* Doesn't work (bug 23675). */
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fp = FREOPEN (file1, "r,ccs=utf-8", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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#else /* Works instead. */
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xfclose (fp);
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fp = xfopen (file1, "r,ccs=utf-8");
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#endif
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wc = fgetwc (fp);
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TEST_COMPARE (wc, (wint_t) 0xc0);
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wc = fgetwc (fp);
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TEST_COMPARE (wc, (wint_t) 0xc1);
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wc = fgetwc (fp);
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TEST_COMPARE (wc, WEOF);
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xfclose (fp);
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END_TEST;
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START_TEST ("testing r,ccs=utf-8 -> r\n");
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fp = xfopen (file1, "r,ccs=utf-8");
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fp = FREOPEN (file1, "r", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "\u00c0\u00c1");
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xfclose (fp);
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END_TEST;
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/* Test that errors closing the old file are ignored. */
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START_TEST ("testing errors closing old file ignored\n");
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fp = xfopen ("/dev/full", "w");
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fputc ('x', fp);
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fp = FREOPEN (file1, "r", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_COMPARE_FILE_STRING (fp, "\u00c0\u00c1");
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xfclose (fp);
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END_TEST;
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/* Test that error / EOF state from the old file are cleared. */
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START_TEST ("testing error state from old file cleared\n");
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fp = xfopen ("/dev/full", "w");
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fputc ('x', fp);
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fflush (fp);
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TEST_VERIFY (ferror (fp));
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TEST_VERIFY (!feof (fp));
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fp = FREOPEN (file2, "w", fp);
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TEST_VERIFY_EXIT (fp != NULL);
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TEST_VERIFY (!ferror (fp));
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TEST_VERIFY (!feof (fp));
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xfclose (fp);
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END_TEST;
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START_TEST ("testing EOF state from old file cleared\n");
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fp = xfopen ("/dev/null", "r");
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fgetc (fp);
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TEST_VERIFY (!ferror (fp));
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TEST_VERIFY (feof (fp));
|
|
fp = FREOPEN (file2, "r", fp);
|
|
TEST_VERIFY_EXIT (fp != NULL);
|
|
TEST_VERIFY (!ferror (fp));
|
|
TEST_VERIFY (!feof (fp));
|
|
xfclose (fp);
|
|
END_TEST;
|
|
|
|
/* Test freopen with NULL, same mode (should flush content and reset
|
|
file offset). */
|
|
|
|
START_TEST ("testing freopen with NULL, same mode\n");
|
|
fp = xfopen (file1, "r+");
|
|
ret = fputs ("same mode", fp);
|
|
TEST_VERIFY (ret >= 0);
|
|
fp = FREOPEN (NULL, "r+", fp);
|
|
TEST_VERIFY_EXIT (fp != NULL);
|
|
TEST_COMPARE_FILE_STRING (fp, "same mode");
|
|
xfclose (fp);
|
|
END_TEST;
|
|
|
|
/* Test freopen with NULL, different mode. */
|
|
|
|
START_TEST ("testing freopen with NULL, different mode\n");
|
|
fp = xfopen (file1, "w");
|
|
ret = fputs ("different mode", fp);
|
|
TEST_VERIFY (ret >= 0);
|
|
fp = FREOPEN (NULL, "r", fp);
|
|
TEST_VERIFY_EXIT (fp != NULL);
|
|
TEST_COMPARE_FILE_STRING (fp, "different mode");
|
|
xfclose (fp);
|
|
END_TEST;
|
|
|
|
/* Test freopen with NULL, renamed file. This verifies that
|
|
reopening succeeds (and resets the file position indicator to
|
|
start of file) even when the original path could no longer be
|
|
opened. */
|
|
|
|
START_TEST ("testing freopen with NULL, renamed file\n");
|
|
fp = xfopen (file1, "r+");
|
|
ret = fputs ("file has been renamed", fp);
|
|
TEST_VERIFY (ret >= 0);
|
|
ret = rename (file1, file1a);
|
|
TEST_COMPARE (ret, 0);
|
|
fp = FREOPEN (NULL, "r+", fp);
|
|
TEST_VERIFY_EXIT (fp != NULL);
|
|
TEST_COMPARE_FILE_STRING (fp, "file has been renamed");
|
|
xfclose (fp);
|
|
ret = rename (file1a, file1);
|
|
TEST_COMPARE (ret, 0);
|
|
END_TEST;
|
|
|
|
/* Test freopen with NULL, deleted file. This verifies that
|
|
reopening succeeds (and resets the file position indicator to
|
|
start of file) even when the original path could no longer be
|
|
opened. */
|
|
|
|
START_TEST ("testing freopen with NULL, deleted file\n");
|
|
fp = xfopen (file1, "r+");
|
|
ret = fputs ("file has now been deleted", fp);
|
|
TEST_VERIFY (ret >= 0);
|
|
ret = remove (file1);
|
|
TEST_COMPARE (ret, 0);
|
|
fp = FREOPEN (NULL, "r+", fp);
|
|
TEST_VERIFY_EXIT (fp != NULL);
|
|
TEST_COMPARE_FILE_STRING (fp, "file has now been deleted");
|
|
xfclose (fp);
|
|
/* Recreate the file so it is present when expected for temporary
|
|
file deletion. */
|
|
support_write_file_string (file1, "file1");
|
|
END_TEST;
|
|
|
|
free (temp_dir);
|
|
free (file1);
|
|
free (file2);
|
|
free (file3);
|
|
free (file4);
|
|
free (file1a);
|
|
return 0;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|