/* Test freopen with mmap stdio. Copyright (C) 2002-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Jakub Jelinek <jakub@redhat.com>, 2002. 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 <http://www.gnu.org/licenses/>. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <support/check.h> #include <support/temp_file.h> static int fd; static char *name; static void do_prepare (int argc, char *argv[]) { fd = create_temp_file ("tst-freopen.", &name); TEST_VERIFY_EXIT (fd != -1); } #define PREPARE do_prepare /* Basic tests for freopen. */ static void do_test_basic (void) { const char * const test = "Let's test freopen.\n"; char temp[strlen (test) + 1]; FILE *f = fdopen (fd, "w"); if (f == NULL) FAIL_EXIT1 ("fdopen: %m"); fputs (test, f); fclose (f); f = fopen (name, "r"); if (f == NULL) FAIL_EXIT1 ("fopen: %m"); if (fread (temp, 1, strlen (test), f) != strlen (test)) FAIL_EXIT1 ("fread: %m"); temp [strlen (test)] = '\0'; if (strcmp (test, temp)) FAIL_EXIT1 ("read different string than was written: (%s, %s)", test, temp); f = freopen (name, "r+", f); if (f == NULL) FAIL_EXIT1 ("freopen: %m"); if (fseek (f, 0, SEEK_SET) != 0) FAIL_EXIT1 ("fseek: %m"); if (fread (temp, 1, strlen (test), f) != strlen (test)) FAIL_EXIT1 ("fread: %m"); temp [strlen (test)] = '\0'; if (strcmp (test, temp)) FAIL_EXIT1 ("read different string than was written: (%s, %s)", test, temp); fclose (f); } /* Test for BZ#21398, where it tries to freopen stdio after the close of its file descriptor. */ static void do_test_bz21398 (void) { (void) close (STDIN_FILENO); FILE *f = freopen (name, "r", stdin); if (f == NULL) FAIL_EXIT1 ("freopen: %m"); TEST_VERIFY_EXIT (ferror (f) == 0); char buf[128]; char *ret = fgets (buf, sizeof (buf), stdin); TEST_VERIFY_EXIT (ret != NULL); TEST_VERIFY_EXIT (ferror (f) == 0); } static int do_test (void) { do_test_basic (); do_test_bz21398 (); return 0; } #include <support/test-driver.c>