libio/tst-fwrite-error.c

   1 /* Test of fwrite() function, adapted from gnulib-tests in grep.
   2    Copyright (C) 2011-2017 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #include <errno.h>
  18 #include <fcntl.h>
  19 #include <unistd.h>
  20 #include <stdio.h>
  21
  22 static int
  23 do_test (void)
  24 {
  25   char tmpl[] = "/tmp/tst-fwrite-error.XXXXXX";
  26   int fd = mkstemp (tmpl);
  27   if (fd == -1)
  28     {
  29       printf ("mkstemp failed with errno %d\n", errno);
  30       return 1;
  31     }
  32   FILE *fp = fdopen (fd, "w");
  33   if (fp == NULL)
  34     {
  35       printf ("fdopen failed with errno %d\n", errno);
  36       return 1;
  37     }
  38
  39   char buf[] = "world";
  40   setvbuf (fp, NULL, _IONBF, 0);
  41   close (fd);
  42   unlink (tmpl);
  43   errno = 0;
  44
  45   int ret = fwrite (buf, 1, sizeof (buf), fp);
  46   if (ret != 0)
  47     {
  48       printf ("fwrite returned %d\n", ret);
  49       return 1;
  50     }
  51   if (errno != EBADF)
  52     {
  53       printf ("Errno is not EBADF: %d\n", errno);
  54       return 1;
  55     }
  56   if (ferror (fp) == 0)
  57     {
  58       printf ("ferror not set\n");
  59       return 1;
  60     }
  61
  62   return 0;
  63 }
  64
  65 #define TEST_FUNCTION do_test ()
  66 #include "../test-skeleton.c"