libio/tst-fwrite-error.c

   1 /* Test of fwrite() function, adapted from gnulib-tests in grep.
   2    Copyright (C) 2011-2019 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 <https://www.gnu.org/licenses/>.  */
  16
  17 #include <errno.h>
  18 #include <fcntl.h>
  19 #include <unistd.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22
  23 static int
  24 do_test (void)
  25 {
  26   char tmpl[] = "/tmp/tst-fwrite-error.XXXXXX";
  27   int fd = mkstemp (tmpl);
  28   if (fd == -1)
  29     {
  30       printf ("mkstemp failed with errno %d\n", errno);
  31       return 1;
  32     }
  33   FILE *fp = fdopen (fd, "w");
  34   if (fp == NULL)
  35     {
  36       printf ("fdopen failed with errno %d\n", errno);
  37       return 1;
  38     }
  39
  40   char buf[] = "world";
  41   setvbuf (fp, NULL, _IONBF, 0);
  42   close (fd);
  43   unlink (tmpl);
  44   errno = 0;
  45
  46   int ret = fwrite (buf, 1, sizeof (buf), fp);
  47   if (ret != 0)
  48     {
  49       printf ("fwrite returned %d\n", ret);
  50       return 1;
  51     }
  52   if (errno != EBADF)
  53     {
  54       printf ("Errno is not EBADF: %d\n", errno);
  55       return 1;
  56     }
  57   if (ferror (fp) == 0)
  58     {
  59       printf ("ferror not set\n");
  60       return 1;
  61     }
  62
  63   return 0;
  64 }
  65
  66 #define TEST_FUNCTION do_test ()
  67 #include "../test-skeleton.c"