kc3-lang/gnulib/tests/test-fclose.c

• Show log

  Commit

• Hash : 3606b90f
  Author :
  Date : 2011-05-06T13:01:17
  

  fclose: guarantee behavior on seekable stdin
  
  * modules/fclose (Depends-on): Add fflush.
  * doc/posix-functions/fclose.texi (fclose): Document this.
  * tests/test-fclose.c (main): Make test for this unconditional.
  
  Signed-off-by: Eric Blake <eblake@redhat.com>
  

Download

• tests/test-fclose.c

• /* 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;
  }
  

Download