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99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
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/* Test freopen of stdin / stdout / stderr.
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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 <mcheck.h>
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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 <support/check.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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int
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do_test (void)
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{
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mtrace ();
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char *temp_dir = support_create_temp_directory ("tst-freopen6");
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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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FILE *fp;
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int ret;
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verbose_printf ("Testing reopening stdin\n");
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fp = FREOPEN (file1, "r", stdin);
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TEST_VERIFY_EXIT (fp == stdin);
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ret = getchar ();
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TEST_COMPARE (ret, 'f');
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ret = getchar ();
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TEST_COMPARE (ret, 'i');
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ret = getchar ();
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TEST_COMPARE (ret, 'l');
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ret = getchar ();
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TEST_COMPARE (ret, 'e');
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ret = getchar ();
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TEST_COMPARE (ret, '1');
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ret = getchar ();
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TEST_COMPARE (ret, EOF);
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xfclose (fp);
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verbose_printf ("Testing reopening stderr\n");
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fp = FREOPEN (file1, "w+", stderr);
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TEST_VERIFY_EXIT (fp == stderr);
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errno = EINVAL;
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perror ("test");
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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, "test: Invalid argument\n");
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xfclose (fp);
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verbose_printf ("Testing reopening stdout\n");
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/* Defer checks until the old stdout has been restored to make it
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more likely any errors are written to the old stdout (rather than
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the temporary file used for the redirected stdout). */
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int old_stdout = dup (STDOUT_FILENO);
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TEST_VERIFY_EXIT (old_stdout != -1);
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int ret_fseek = 0;
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int ret_compare = 0;
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fp = FREOPEN (file1, "w+", stdout);
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int fp_eq_stdout = fp == stdout;
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if (fp != NULL)
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{
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printf ("reopened\n");
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ret_fseek = fseek (fp, 0, SEEK_SET);
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ret_compare = support_compare_file_string (fp, "reopened\n");
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}
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xfclose (fp);
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stdout = fdopen (old_stdout, "w");
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TEST_VERIFY (fp_eq_stdout);
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TEST_COMPARE (ret_fseek, 0);
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TEST_COMPARE (ret_compare, 0);
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xfclose (stdout);
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free (temp_dir);
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free (file1);
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return 0;
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}
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#include <support/test-driver.c>
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