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/* Test of fread() function.
Copyright (C) 2011-2021 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdio.h>
#include "signature.h"
SIGNATURE_CHECK (fread, size_t, (void *, size_t, size_t, FILE *));
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#if HAVE_MSVC_INVALID_PARAMETER_HANDLER
# include "msvc-inval.h"
#endif
#include "macros.h"
int
main (int argc, char **argv)
{
const char *filename = "test-fread.txt";
/* We don't have an fread() function that installs an invalid parameter
handler so far. So install that handler here, explicitly. */
#if HAVE_MSVC_INVALID_PARAMETER_HANDLER \
&& MSVC_INVALID_PARAMETER_HANDLING == DEFAULT_HANDLING
gl_msvc_inval_ensure_handler ();
#endif
/* Prepare a file. */
{
const char text[] = "hello world";
int fd = open (filename, O_RDWR | O_CREAT | O_TRUNC, 0600);
ASSERT (fd >= 0);
ASSERT (write (fd, text, sizeof (text)) == sizeof (text));
ASSERT (close (fd) == 0);
}
/* Test that fread() sets errno if someone else closes the stream
fd behind the back of stdio. */
{
FILE *fp = fopen (filename, "r");
char buf[5];
ASSERT (fp != NULL);
ASSERT (close (fileno (fp)) == 0);
errno = 0;
ASSERT (fread (buf, 1, sizeof (buf), fp) == 0);
ASSERT (errno == EBADF);
ASSERT (ferror (fp));
fclose (fp);
}
/* Test that fread() sets errno if the stream was constructed with
an invalid file descriptor. */
{
FILE *fp = fdopen (-1, "r");
if (fp != NULL)
{
char buf[1];
errno = 0;
ASSERT (fread (buf, 1, 1, fp) == 0);
ASSERT (errno == EBADF);
ASSERT (ferror (fp));
fclose (fp);
}
}
{
FILE *fp;
close (99);
fp = fdopen (99, "r");
if (fp != NULL)
{
char buf[1];
errno = 0;
ASSERT (fread (buf, 1, 1, fp) == 0);
ASSERT (errno == EBADF);
ASSERT (ferror (fp));
fclose (fp);
}
}
/* Clean up. */
unlink (filename);
return 0;
}
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