tests/test-fread.c

   1 /* Test of fread() function.
   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 <config.h>
  18
  19 #include <stdio.h>
  20
  21 #include "signature.h"
  22 SIGNATURE_CHECK (fread, size_t, (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-fread.txt";
  36
  37   /* We don't have an fread() 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   /* Prepare a file.  */
  45   {
  46     const char text[] = "hello world";
  47     int fd = open (filename, O_RDWR | O_CREAT | O_TRUNC, 0600);
  48     ASSERT (fd >= 0);
  49     ASSERT (write (fd, text, sizeof (text)) == sizeof (text));
  50     ASSERT (close (fd) == 0);
  51   }
  52
  53   /* Test that fread() sets errno if someone else closes the stream
  54      fd behind the back of stdio.  */
  55   {
  56     FILE *fp = fopen (filename, "r");
  57     char buf[5];
  58     ASSERT (fp != NULL);
  59     ASSERT (close (fileno (fp)) == 0);
  60     errno = 0;
  61     ASSERT (fread (buf, 1, sizeof (buf), fp) == 0);
  62     ASSERT (errno == EBADF);
  63     ASSERT (ferror (fp));
  64     fclose (fp);
  65   }
  66
  67   /* Test that fread() sets errno if the stream was constructed with
  68      an invalid file descriptor.  */
  69   {
  70     FILE *fp = fdopen (-1, "r");
  71     if (fp != NULL)
  72       {
  73         char buf[1];
  74         errno = 0;
  75         ASSERT (fread (buf, 1, 1, fp) == 0);
  76         ASSERT (errno == EBADF);
  77         ASSERT (ferror (fp));
  78         fclose (fp);
  79       }
  80   }
  81   {
  82     FILE *fp;
  83     close (99);
  84     fp = fdopen (99, "r");
  85     if (fp != NULL)
  86       {
  87         char buf[1];
  88         errno = 0;
  89         ASSERT (fread (buf, 1, 1, fp) == 0);
  90         ASSERT (errno == EBADF);
  91         ASSERT (ferror (fp));
  92         fclose (fp);
  93       }
  94   }
  95
  96   /* Clean up.  */
  97   unlink (filename);
  98
  99   return 0;
 100 }