libio/tst-wfile-sync.c

   1 /* Test that _IO_wfile_sync does not crash (bug 20568).
   2    Copyright (C) 2019-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <fcntl.h>
  20 #include <locale.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <wchar.h>
  25 #include <support/check.h>
  26 #include <support/xstdio.h>
  27 #include <support/xunistd.h>
  28 #include <support/temp_file.h>
  29
  30 static const char test_data[] = "This is a test of _IO_wfile_sync.";
  31
  32 static int
  33 do_test (void)
  34 {
  35   static char *infile;
  36   int infd;
  37   FILE *infp;
  38
  39   infd = create_temp_file ("tst-wfile-sync-in-", &infile);
  40   xwrite (infd, test_data, strlen (test_data));
  41   xclose (infd);
  42
  43   infd = xopen (infile, O_RDONLY, 0);
  44   infp = fdopen (infd, "r");
  45
  46   TEST_VERIFY_EXIT (setlocale (LC_ALL, "de_DE.UTF-8") != NULL);
  47   /* Fill the stdio buffer and advance the read pointer.  */
  48   TEST_VERIFY_EXIT (fgetwc (infp) != WEOF);
  49   /* This calls _IO_wfile_sync, it should not crash.  */
  50   TEST_VERIFY_EXIT (setvbuf (infp, NULL, _IONBF, 0) == 0);
  51   /* Verify that the external file offset has been synchronized.  */
  52   TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 1);
  53
  54   fclose (infp);
  55   free (infile);
  56
  57   return 0;
  58 }
  59
  60 #include <support/test-driver.c>