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

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• tests/test-fclose.c

• /* Test of fclose module.
     Copyright (C) 2011-2023 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/>.  */
  
  /* 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.  */
    {
      FILE *fp = fdopen (fd, "w+");
      ASSERT (fp != NULL);
      ASSERT (close (fd) == 0);
      errno = 0;
      ASSERT (fclose (fp) == EOF);
      ASSERT (errno == EBADF);
    }
  
    /* Test that fclose() sets errno if the stream was constructed with
       an invalid file descriptor.  */
    {
      FILE *fp = fdopen (-1, "r");
      if (fp != NULL)
        {
          errno = 0;
          ASSERT (fclose (fp) == EOF);
          ASSERT (errno == EBADF);
        }
    }
    {
      FILE *fp;
      close (99);
      fp = fdopen (99, "r");
      if (fp != NULL)
        {
          errno = 0;
          ASSERT (fclose (fp) == EOF);
          ASSERT (errno == EBADF);
        }
    }
  
    /* Clean up.  */
    ASSERT (remove (BASE) == 0);
  
    return 0;
  }
  

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