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test-fclose.c

/* -*- buffer-read-only: t -*- vi: set ro: */
/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
/* Test of fclose module.
   Copyright (C) 2011 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, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

/* Written by Eric Blake.  */

#include <config.h>

#include <stdio.h>

#include "signature.h"
SIGNATURE_CHECK (fclose, int, (FILE *));

#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "macros.h"

#define BASE "test-fclose.t"

int
main (int argc, char **argv)
{
  const char buf[] = "hello world";
  int fd;
  int fd2;
  FILE *f;

  /* Prepare a seekable file.  */
  fd = open (BASE, O_RDWR | O_CREAT | O_TRUNC, 0600);
  ASSERT (0 <= fd);
  ASSERT (write (fd, buf, sizeof buf) == sizeof buf);
  ASSERT (lseek (fd, 1, SEEK_SET) == 1);

  /* Create an output stream visiting the file; when it is closed, all
     other file descriptors visiting the file must see the new file
     position.  */
  fd2 = dup (fd);
  ASSERT (0 <= fd2);
  f = fdopen (fd2, "w");
  ASSERT (f);
  ASSERT (fputc (buf[1], f) == buf[1]);
  ASSERT (fclose (f) == 0);
  errno = 0;
  ASSERT (lseek (fd2, 0, SEEK_CUR) == -1);
  ASSERT (errno == EBADF);
  ASSERT (lseek (fd, 0, SEEK_CUR) == 2);

  /* Likewise for an input stream.  */
  fd2 = dup (fd);
  ASSERT (0 <= fd2);
  f = fdopen (fd2, "r");
  ASSERT (f);
  ASSERT (fgetc (f) == buf[2]);
  ASSERT (fclose (f) == 0);
  errno = 0;
  ASSERT (lseek (fd2, 0, SEEK_CUR) == -1);
  ASSERT (errno == EBADF);
  ASSERT (lseek (fd, 0, SEEK_CUR) == 3);

  /* Test that fclose() sets errno if someone else closes the stream
     fd behind the back of stdio.  */
  f = fdopen (fd, "w+");
  ASSERT (f);
  ASSERT (close (fd) == 0);
  errno = 0;
  ASSERT (fclose (f) == EOF);
  ASSERT (errno == EBADF);

  /* Clean up.  */
  ASSERT (remove (BASE) == 0);

  return 0;
}

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