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glibc/stdio-common/tst-freopen2-main.c
Joseph Myers f512634dde Clear flags2 flags set from mode in freopen (bug 32134) 
As reported in bug 32134, freopen does not clear the flags set in
fp->_flags2 by the "e", "m" or "c" mode characters.  Clear these so
that they can be set or not as appropriate from the mode string passed
to freopen.  The relevant test for "e" in tst-freopen2-main.c is
enabled accordingly; "c" is expected to be covered in a separately
written test (and while tst-freopen2-main.c does include transitions
to and from "m", that's not really a semantic flag intended to result
in behaving in an observably different way).

Tested for x86_64.
2024-09-05 11:15:29 +00:00

525 lines
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/* Test freopen.
Copyright (C) 2024 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; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <fcntl.h>
#include <mcheck.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include <support/check.h>
#include <support/descriptors.h>
#include <support/file_contents.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
#include <support/xstdio.h>
#define START_TEST(DESC) \
do \
{ \
fds = support_descriptors_list (); \
verbose_printf (DESC); \
} \
while (0)
#define END_TEST \
do \
{ \
support_descriptors_check (fds); \
support_descriptors_free (fds); \
} \
while (0)
int
do_test (void)
{
mtrace ();
struct support_descriptors *fds;
char *temp_dir = support_create_temp_directory ("tst-freopen2");
char *file1 = xasprintf ("%s/file1", temp_dir);
support_write_file_string (file1, "file1");
add_temp_file (file1);
char *file2 = xasprintf ("%s/file2", temp_dir);
support_write_file_string (file2, "file2");
add_temp_file (file2);
char *file3 = xasprintf ("%s/file3", temp_dir);
char *file4 = xasprintf ("%s/file4", temp_dir);
char *file1a = xasprintf ("%s/file1a", temp_dir);
FILE *fp;
int ret;
wint_t wc;
/* Test each pair of old and new modes from r w a. */
START_TEST ("Testing r -> r\n");
fp = xfopen (file1, "r");
fp = FREOPEN (file2, "r", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "file2");
xfclose (fp);
END_TEST;
START_TEST ("Testing r -> w\n");
fp = xfopen (file1, "r");
fp = FREOPEN (file2, "w", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("File2new", fp);
TEST_VERIFY (ret >= 0);
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file1, "file1");
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "File2new");
END_TEST;
START_TEST ("Testing r -> a\n");
fp = xfopen (file1, "r");
fp = FREOPEN (file2, "a", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("3", fp);
TEST_VERIFY (ret >= 0);
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "File2new3");
END_TEST;
START_TEST ("Testing w -> r\n");
fp = xfopen (file1, "w");
fp = FREOPEN (file2, "r", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "File2new3");
xfclose (fp);
END_TEST;
START_TEST ("Testing w -> w\n");
fp = xfopen (file1, "w");
fp = FREOPEN (file2, "w", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("next", fp);
TEST_VERIFY (ret >= 0);
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file1, "");
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "next");
END_TEST;
START_TEST ("Testing w -> a\n");
fp = xfopen (file1, "w");
fp = FREOPEN (file2, "a", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("4", fp);
TEST_VERIFY (ret >= 0);
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "next4");
END_TEST;
START_TEST ("Testing a -> r\n");
fp = xfopen (file1, "a");
fp = FREOPEN (file2, "r", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "next4");
xfclose (fp);
END_TEST;
START_TEST ("Testing a -> w\n");
fp = xfopen (file1, "a");
fp = FREOPEN (file2, "w", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("another", fp);
TEST_VERIFY (ret >= 0);
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "another");
END_TEST;
START_TEST ("Testing a -> a\n");
fp = xfopen (file1, "a");
fp = FREOPEN (file2, "a", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("5", fp);
TEST_VERIFY (ret >= 0);
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "another5");
END_TEST;
/* Test for file originally opened with fopen64. */
START_TEST ("Testing fopen64 a -> a\n");
fp = fopen64 (file1, "a");
TEST_VERIFY_EXIT (fp != NULL);
fp = FREOPEN (file2, "a", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("64", fp);
TEST_VERIFY (ret >= 0);
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "another564");
END_TEST;
/* Test calling freopen more than once on the same FILE *. */
START_TEST ("Testing r -> w -> r\n");
fp = xfopen (file1, "r");
fp = FREOPEN (file2, "w", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("freopen-twice", fp);
TEST_VERIFY (ret >= 0);
fp = FREOPEN (file2, "r", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "freopen-twice");
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "freopen-twice");
END_TEST;
START_TEST ("Testing r -> w -> r (exactly one freopen64)\n");
fp = xfopen (file1, "r");
fp = OTHER_FREOPEN (file2, "w", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("freopen-twice64", fp);
TEST_VERIFY (ret >= 0);
fp = FREOPEN (file2, "r", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "freopen-twice64");
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "freopen-twice64");
END_TEST;
/* Test changing to/from b (binary, no-op). */
START_TEST ("Testing rb -> r\n");
fp = xfopen (file1, "rb");
fp = FREOPEN (file2, "r", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "freopen-twice64");
xfclose (fp);
END_TEST;
START_TEST ("Testing r -> rb\n");
fp = xfopen (file1, "r");
fp = FREOPEN (file2, "rb", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "freopen-twice64");
xfclose (fp);
END_TEST;
/* Test changing to/from + (read-and-write). */
START_TEST ("Testing r -> w+\n");
fp = xfopen (file1, "r");
fp = FREOPEN (file2, "w+", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("latest", fp);
TEST_VERIFY (ret >= 0);
ret = fseek (fp, 0, SEEK_SET);
TEST_COMPARE (ret, 0);
TEST_COMPARE_FILE_STRING (fp, "latest");
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "latest");
END_TEST;
START_TEST ("Testing w -> a+\n");
fp = xfopen (file1, "w");
fp = FREOPEN (file2, "a+", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("suffix", fp);
TEST_VERIFY (ret >= 0);
ret = fseek (fp, 0, SEEK_SET);
TEST_COMPARE (ret, 0);
TEST_COMPARE_FILE_STRING (fp, "latestsuffix");
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "latestsuffix");
END_TEST;
START_TEST ("Testing a -> r+\n");
fp = xfopen (file1, "a");
fp = FREOPEN (file2, "r+", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "latestsuffix");
ret = fseek (fp, 0, SEEK_SET);
TEST_COMPARE (ret, 0);
ret = fputs ("new", fp);
TEST_VERIFY (ret >= 0);
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "newestsuffix");
END_TEST;
START_TEST ("Testing r+ -> w\n");
fp = xfopen (file1, "r+");
fp = FREOPEN (file2, "w", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("plusto", fp);
TEST_VERIFY (ret >= 0);
ret = fseek (fp, 0, SEEK_SET);
TEST_COMPARE (ret, 0);
errno = 0;
TEST_COMPARE (fgetc (fp), EOF);
TEST_COMPARE (errno, EBADF);
clearerr (fp);
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "plusto");
END_TEST;
START_TEST ("Testing w+ -> a\n");
fp = xfopen (file1, "w+");
fp = FREOPEN (file2, "a", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("more", fp);
TEST_VERIFY (ret >= 0);
ret = fseek (fp, 0, SEEK_SET);
TEST_COMPARE (ret, 0);
errno = 0;
TEST_COMPARE (fgetc (fp), EOF);
TEST_COMPARE (errno, EBADF);
clearerr (fp);
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "plustomore");
END_TEST;
START_TEST ("Testing a+ -> r\n");
fp = xfopen (file1, "a+");
fp = FREOPEN (file2, "rr", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "plustomore");
ret = fputs ("2", fp);
TEST_COMPARE (ret, EOF);
clearerr (fp);
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "plustomore");
END_TEST;
/* Test changing to/from e (FD_CLOEXEC). */
START_TEST ("Testing re -> r\n");
fp = xfopen (file1, "re");
ret = fcntl (fileno (fp), F_GETFD);
TEST_VERIFY (ret != -1);
TEST_COMPARE (ret & FD_CLOEXEC, FD_CLOEXEC);
fp = FREOPEN (file2, "r", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fcntl (fileno (fp), F_GETFD);
TEST_VERIFY (ret != -1);
TEST_COMPARE (ret & FD_CLOEXEC, 0);
TEST_COMPARE_FILE_STRING (fp, "plustomore");
xfclose (fp);
END_TEST;
START_TEST ("Testing r -> re\n");
fp = xfopen (file1, "r");
ret = fcntl (fileno (fp), F_GETFD);
TEST_VERIFY (ret != -1);
TEST_COMPARE (ret & FD_CLOEXEC, 0);
fp = FREOPEN (file2, "re", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fcntl (fileno (fp), F_GETFD);
TEST_VERIFY (ret != -1);
TEST_COMPARE (ret & FD_CLOEXEC, FD_CLOEXEC);
TEST_COMPARE_FILE_STRING (fp, "plustomore");
xfclose (fp);
END_TEST;
/* Test changing to/from m (mmap) (a no-op as far as testing
semantics is concerned). */
START_TEST ("Testing rm -> r\n");
fp = xfopen (file1, "rm");
fp = FREOPEN (file2, "r", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "plustomore");
xfclose (fp);
END_TEST;
START_TEST ("Testing r -> rm\n");
fp = xfopen (file1, "r");
fp = FREOPEN (file2, "rm", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "plustomore");
xfclose (fp);
END_TEST;
/* Test changing to/from x (O_EXCL). */
START_TEST ("Testing wx -> w\n");
fp = xfopen (file3, "wx");
add_temp_file (file3);
fp = FREOPEN (file2, "w", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = fputs ("wxtow", fp);
TEST_VERIFY (ret >= 0);
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file2, "wxtow");
END_TEST;
START_TEST ("Testing w -> wx (file does not exist)\n");
fp = xfopen (file1, "w");
fp = FREOPEN (file4, "wx", fp);
TEST_VERIFY_EXIT (fp != NULL);
add_temp_file (file4);
ret = fputs ("wtowx", fp);
TEST_VERIFY (ret >= 0);
xfclose (fp);
TEST_OPEN_AND_COMPARE_FILE_STRING (file4, "wtowx");
END_TEST;
/* Test with ,ccs=CHARSET. */
START_TEST ("testing w,ccs=utf-8 -> r\n");
fp = xfopen (file1, "w,ccs=utf-8");
ret = fputws (L"\xc0\xc1", fp);
TEST_VERIFY (ret >= 0);
fp = FREOPEN (file2, "r", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "wxtow");
xfclose (fp);
END_TEST;
START_TEST ("testing w,ccs=iso-8859-1 -> r,ccs=utf-8\n");
fp = xfopen (file2, "w,ccs=iso-8859-1");
ret = fputws (L"\xc0\xc1", fp);
TEST_VERIFY (ret >= 0);
#if 0 /* Doesn't work (bug 23675). */
fp = FREOPEN (file1, "r,ccs=utf-8", fp);
TEST_VERIFY_EXIT (fp != NULL);
#else /* Works instead. */
xfclose (fp);
fp = xfopen (file1, "r,ccs=utf-8");
#endif
wc = fgetwc (fp);
TEST_COMPARE (wc, (wint_t) 0xc0);
wc = fgetwc (fp);
TEST_COMPARE (wc, (wint_t) 0xc1);
wc = fgetwc (fp);
TEST_COMPARE (wc, WEOF);
xfclose (fp);
END_TEST;
START_TEST ("testing r,ccs=utf-8 -> r\n");
fp = xfopen (file1, "r,ccs=utf-8");
fp = FREOPEN (file1, "r", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "\u00c0\u00c1");
xfclose (fp);
END_TEST;
/* Test that errors closing the old file are ignored. */
START_TEST ("testing errors closing old file ignored\n");
fp = xfopen ("/dev/full", "w");
fputc ('x', fp);
fp = FREOPEN (file1, "r", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_COMPARE_FILE_STRING (fp, "\u00c0\u00c1");
xfclose (fp);
END_TEST;
/* Test that error / EOF state from the old file are cleared. */
START_TEST ("testing error state from old file cleared\n");
fp = xfopen ("/dev/full", "w");
fputc ('x', fp);
fflush (fp);
TEST_VERIFY (ferror (fp));
TEST_VERIFY (!feof (fp));
fp = FREOPEN (file2, "w", fp);
TEST_VERIFY_EXIT (fp != NULL);
TEST_VERIFY (!ferror (fp));
TEST_VERIFY (!feof (fp));
xfclose (fp);
END_TEST;
START_TEST ("testing EOF state from old file cleared\n");
fp = xfopen ("/dev/null", "r");
fgetc (fp);
TEST_VERIFY (!ferror (fp));
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>
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