lib/gl/tests/test-fwrite.c

   1 /* Test of fwrite() function.
   2    Copyright (C) 2011-2012 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 <config.h>
  18
  19 #include <stdio.h>
  20
  21 #include "signature.h"
  22 SIGNATURE_CHECK (fwrite, size_t, (const void *, size_t, size_t, FILE *));
  23
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <unistd.h>
  27
  28 #include "msvc-inval.h"
  29
  30 #include "macros.h"
  31
  32 int
  33 main (int argc, char **argv)
  34 {
  35   const char *filename = "test-fwrite.txt";
  36
  37   /* We don't have an fwrite() function that installs an invalid parameter
  38      handler so far.  So install that handler here, explicitly.  */
  39 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER \
  40     && MSVC_INVALID_PARAMETER_HANDLING == DEFAULT_HANDLING
  41   gl_msvc_inval_ensure_handler ();
  42 #endif
  43
  44   /* Test that fwrite() on an unbuffered stream sets errno if someone else
  45      closes the stream fd behind the back of stdio.  */
  46   {
  47     FILE *fp = fopen (filename, "w");
  48     char buf[5] = "world";
  49     ASSERT (fp != NULL);
  50     setvbuf (fp, NULL, _IONBF, 0);
  51     ASSERT (close (fileno (fp)) == 0);
  52     errno = 0;
  53     ASSERT (fwrite (buf, 1, sizeof (buf), fp) == 0);
  54     ASSERT (errno == EBADF);
  55     ASSERT (ferror (fp));
  56     fclose (fp);
  57   }
  58
  59   /* Test that fwrite() on an unbuffered stream sets errno if the stream
  60      was constructed with an invalid file descriptor.  */
  61   {
  62     FILE *fp = fdopen (-1, "w");
  63     if (fp != NULL)
  64       {
  65         char buf[5] = "world";
  66         setvbuf (fp, NULL, _IONBF, 0);
  67         errno = 0;
  68         ASSERT (fwrite (buf, 1, sizeof (buf), fp) == 0);
  69         ASSERT (errno == EBADF);
  70         ASSERT (ferror (fp));
  71         fclose (fp);
  72       }
  73   }
  74   {
  75     FILE *fp = fdopen (99, "w");
  76     if (fp != NULL)
  77       {
  78         char buf[5] = "world";
  79         setvbuf (fp, NULL, _IONBF, 0);
  80         errno = 0;
  81         ASSERT (fwrite (buf, 1, sizeof (buf), fp) == 0);
  82         ASSERT (errno == EBADF);
  83         ASSERT (ferror (fp));
  84         fclose (fp);
  85       }
  86   }
  87
  88   /* Clean up.  */
  89   unlink (filename);
  90
  91   return 0;
  92 }