stdio-common/tst-put-error.c

   1 /* Verify that print functions return error when there is an I/O error.
   2
   3    Copyright (C) 2005-2012 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <errno.h>
  21 #include <error.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25
  26
  27 static int
  28 do_test (void)
  29 {
  30   char tmpl[] = "/tmp/tst-put-error.XXXXXX";
  31   int fd = mkstemp (tmpl);
  32   if (fd == -1)
  33     error (EXIT_FAILURE, errno, "cannot create temporary file");
  34   FILE *fp = fdopen (fd, "w");
  35   if (fp == NULL)
  36     error (EXIT_FAILURE, errno, "fdopen");
  37   setlinebuf (fp);
  38   close (fd);
  39   unlink (tmpl);
  40   int n = fprintf (fp, "hello world\n");
  41   printf ("fprintf = %d\n", n);
  42   if (n >= 0)
  43     error (EXIT_FAILURE, 0, "first fprintf succeeded");
  44   n = fprintf (fp, "hello world\n");
  45   printf ("fprintf = %d\n", n);
  46   if (n >= 0)
  47     error (EXIT_FAILURE, 0, "second fprintf succeeded");
  48
  49   /* Padded printing takes a different code path.  */
  50   n = fprintf (fp, "%10000s", "foo");
  51   printf ("fprintf = %d\n", n);
  52   if (n >= 0)
  53     error (EXIT_FAILURE, 0, "padded fprintf succeeded");
  54
  55   return 0;
  56 }
  57
  58 #define TEST_FUNCTION do_test ()
  59 #include "../test-skeleton.c"