mirror of git://sourceware.org/git/glibc.git
95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/* Test fflush (NULL) flushes input files (bug 32369).
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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 <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <wchar.h>
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#include <support/check.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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FILE *temp = tmpfile ();
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TEST_VERIFY_EXIT (temp != NULL);
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fprintf (temp, "abc");
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TEST_COMPARE (fflush (temp), 0);
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TEST_COMPARE (lseek (fileno (temp), 0, SEEK_SET), 0);
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TEST_COMPARE (fgetc (temp), 'a');
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TEST_COMPARE (fflush (NULL), 0);
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TEST_COMPARE (lseek (fileno (temp), 0, SEEK_CUR), 1);
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xfclose (temp);
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/* Likewise, but in wide mode. */
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temp = tmpfile ();
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TEST_VERIFY_EXIT (temp != NULL);
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fwprintf (temp, L"abc");
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TEST_COMPARE (fflush (temp), 0);
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TEST_COMPARE (lseek (fileno (temp), 0, SEEK_SET), 0);
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TEST_COMPARE (fgetwc (temp), L'a');
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TEST_COMPARE (fflush (NULL), 0);
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TEST_COMPARE (lseek (fileno (temp), 0, SEEK_CUR), 1);
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xfclose (temp);
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/* Similar tests, but with the flush implicitly occurring on exit
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(in a forked subprocess). */
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temp = tmpfile ();
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TEST_VERIFY_EXIT (temp != NULL);
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pid_t pid = xfork ();
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if (pid == 0)
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{
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fprintf (temp, "abc");
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TEST_COMPARE (fflush (temp), 0);
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TEST_COMPARE (lseek (fileno (temp), 0, SEEK_SET), 0);
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TEST_COMPARE (fgetc (temp), 'a');
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exit (EXIT_SUCCESS);
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}
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else
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{
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TEST_COMPARE (xwaitpid (pid, NULL, 0), pid);
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TEST_COMPARE (lseek (fileno (temp), 0, SEEK_CUR), 1);
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xfclose (temp);
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}
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temp = tmpfile ();
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TEST_VERIFY_EXIT (temp != NULL);
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pid = xfork ();
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if (pid == 0)
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{
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fwprintf (temp, L"abc");
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TEST_COMPARE (fflush (temp), 0);
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TEST_COMPARE (lseek (fileno (temp), 0, SEEK_SET), 0);
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TEST_COMPARE (fgetwc (temp), L'a');
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exit (EXIT_SUCCESS);
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}
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else
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{
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TEST_COMPARE (xwaitpid (pid, NULL, 0), pid);
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TEST_COMPARE (lseek (fileno (temp), 0, SEEK_CUR), 1);
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xfclose (temp);
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}
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return 0;
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}
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#include <support/test-driver.c>
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