mirror of git://sourceware.org/git/glibc.git
226 lines
7.3 KiB
C
226 lines
7.3 KiB
C
/* Test offset of input file descriptor after close (bug 12724).
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Copyright (C) 2025 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 <stdio.h>
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#include <wchar.h>
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#include <support/check.h>
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#include <support/temp_file.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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char *filename = NULL;
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int fd = create_temp_file ("tst-fclose-offset", &filename);
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TEST_VERIFY_EXIT (fd != -1);
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/* Test offset of open file description for output and input streams
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after fclose, case from bug 12724. */
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const char buf[] = "hello world";
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xwrite (fd, buf, sizeof buf);
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TEST_COMPARE (lseek (fd, 1, SEEK_SET), 1);
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int fd2 = xdup (fd);
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FILE *f = fdopen (fd2, "w");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_COMPARE (fputc (buf[1], f), buf[1]);
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xfclose (f);
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errno = 0;
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TEST_COMPARE (lseek (fd2, 0, SEEK_CUR), -1);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (lseek (fd, 0, SEEK_CUR), 2);
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/* Likewise for an input stream. */
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fd2 = xdup (fd);
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f = fdopen (fd2, "r");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_COMPARE (fgetc (f), buf[2]);
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xfclose (f);
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errno = 0;
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TEST_COMPARE (lseek (fd2, 0, SEEK_CUR), -1);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (lseek (fd, 0, SEEK_CUR), 3);
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/* Test offset of open file description for output and input streams
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after fclose, case from comment on bug 12724 (failed after first
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attempt at fixing that bug). This verifies that the offset is
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not reset when there has been no input or output on the FILE* (in
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that case, the FILE* might not be the active handle). */
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TEST_COMPARE (lseek (fd, 0, SEEK_SET), 0);
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xwrite (fd, buf, sizeof buf);
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TEST_COMPARE (lseek (fd, 1, SEEK_SET), 1);
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fd2 = xdup (fd);
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f = fdopen (fd2, "w");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_COMPARE (lseek (fd, 4, SEEK_SET), 4);
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xfclose (f);
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errno = 0;
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TEST_COMPARE (lseek (fd2, 0, SEEK_CUR), -1);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (lseek (fd, 0, SEEK_CUR), 4);
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/* Likewise for an input stream. */
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fd2 = xdup (fd);
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f = fdopen (fd2, "r");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_COMPARE (lseek (fd, 4, SEEK_SET), 4);
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xfclose (f);
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errno = 0;
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TEST_COMPARE (lseek (fd2, 0, SEEK_CUR), -1);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (lseek (fd, 0, SEEK_CUR), 4);
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/* Further cases without specific tests in bug 12724, to verify
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proper operation of the rules about the offset only being set
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when the stream is the active handle. */
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/* Test offset set by fclose after fseek and fgetc. */
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TEST_COMPARE (lseek (fd, 0, SEEK_SET), 0);
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fd2 = xdup (fd);
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f = fdopen (fd2, "r");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_COMPARE (fseek (f, 1, SEEK_SET), 0);
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TEST_COMPARE (fgetc (f), buf[1]);
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xfclose (f);
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errno = 0;
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TEST_COMPARE (lseek (fd2, 0, SEEK_CUR), -1);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (lseek (fd, 0, SEEK_CUR), 2);
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/* Test offset not set by fclose after fseek and fgetc, if that
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fgetc is at EOF (in which case the active handle might have
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changed). */
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TEST_COMPARE (lseek (fd, 0, SEEK_SET), 0);
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fd2 = xdup (fd);
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f = fdopen (fd2, "r");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_COMPARE (fseek (f, sizeof buf, SEEK_SET), 0);
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TEST_COMPARE (fgetc (f), EOF);
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TEST_COMPARE (lseek (fd, 4, SEEK_SET), 4);
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xfclose (f);
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errno = 0;
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TEST_COMPARE (lseek (fd2, 0, SEEK_CUR), -1);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (lseek (fd, 0, SEEK_CUR), 4);
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/* Test offset not set by fclose after fseek and fgetc and fflush
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(active handle might have changed after fflush). */
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TEST_COMPARE (lseek (fd, 0, SEEK_SET), 0);
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fd2 = xdup (fd);
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f = fdopen (fd2, "r");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_COMPARE (fseek (f, 1, SEEK_SET), 0);
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TEST_COMPARE (fgetc (f), buf[1]);
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TEST_COMPARE (fflush (f), 0);
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TEST_COMPARE (lseek (fd, 4, SEEK_SET), 4);
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xfclose (f);
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errno = 0;
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TEST_COMPARE (lseek (fd2, 0, SEEK_CUR), -1);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (lseek (fd, 0, SEEK_CUR), 4);
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/* Test offset not set by fclose after fseek and fgetc, if the
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stream is unbuffered (active handle might change at any
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time). */
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TEST_COMPARE (lseek (fd, 0, SEEK_SET), 0);
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fd2 = xdup (fd);
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f = fdopen (fd2, "r");
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TEST_VERIFY_EXIT (f != NULL);
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setbuf (f, NULL);
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TEST_COMPARE (fseek (f, 1, SEEK_SET), 0);
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TEST_COMPARE (fgetc (f), buf[1]);
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TEST_COMPARE (lseek (fd, 4, SEEK_SET), 4);
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xfclose (f);
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errno = 0;
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TEST_COMPARE (lseek (fd2, 0, SEEK_CUR), -1);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (lseek (fd, 0, SEEK_CUR), 4);
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/* Also test such cases with the stream in wide mode. */
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/* Test offset set by fclose after fseek and fgetwc. */
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TEST_COMPARE (lseek (fd, 0, SEEK_SET), 0);
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fd2 = xdup (fd);
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f = fdopen (fd2, "r");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_COMPARE (fseek (f, 1, SEEK_SET), 0);
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TEST_COMPARE (fgetwc (f), (wint_t) buf[1]);
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xfclose (f);
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errno = 0;
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TEST_COMPARE (lseek (fd2, 0, SEEK_CUR), -1);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (lseek (fd, 0, SEEK_CUR), 2);
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/* Test offset not set by fclose after fseek and fgetwc, if that
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fgetwc is at EOF (in which case the active handle might have
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changed). */
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TEST_COMPARE (lseek (fd, 0, SEEK_SET), 0);
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fd2 = xdup (fd);
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f = fdopen (fd2, "r");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_COMPARE (fseek (f, sizeof buf, SEEK_SET), 0);
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TEST_COMPARE (fgetwc (f), WEOF);
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TEST_COMPARE (lseek (fd, 4, SEEK_SET), 4);
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xfclose (f);
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errno = 0;
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TEST_COMPARE (lseek (fd2, 0, SEEK_CUR), -1);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (lseek (fd, 0, SEEK_CUR), 4);
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/* Test offset not set by fclose after fseek and fgetwc and fflush
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(active handle might have changed after fflush). */
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TEST_COMPARE (lseek (fd, 0, SEEK_SET), 0);
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fd2 = xdup (fd);
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f = fdopen (fd2, "r");
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TEST_VERIFY_EXIT (f != NULL);
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TEST_COMPARE (fseek (f, 1, SEEK_SET), 0);
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TEST_COMPARE (fgetwc (f), (wint_t) buf[1]);
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TEST_COMPARE (fflush (f), 0);
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TEST_COMPARE (lseek (fd, 4, SEEK_SET), 4);
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xfclose (f);
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errno = 0;
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TEST_COMPARE (lseek (fd2, 0, SEEK_CUR), -1);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (lseek (fd, 0, SEEK_CUR), 4);
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/* Test offset not set by fclose after fseek and fgetwc, if the
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stream is unbuffered (active handle might change at any
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time). */
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TEST_COMPARE (lseek (fd, 0, SEEK_SET), 0);
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fd2 = xdup (fd);
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f = fdopen (fd2, "r");
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TEST_VERIFY_EXIT (f != NULL);
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setbuf (f, NULL);
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TEST_COMPARE (fseek (f, 1, SEEK_SET), 0);
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TEST_COMPARE (fgetwc (f), (wint_t) buf[1]);
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TEST_COMPARE (lseek (fd, 4, SEEK_SET), 4);
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xfclose (f);
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errno = 0;
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TEST_COMPARE (lseek (fd2, 0, SEEK_CUR), -1);
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TEST_COMPARE (errno, EBADF);
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TEST_COMPARE (lseek (fd, 0, SEEK_CUR), 4);
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return 0;
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}
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#include <support/test-driver.c>
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