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

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• Hash : 7b089321
  Author :
  Date : 2025-01-01T09:24:36
  

  maint: run 'make update-copyright'
  

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• tests/test-fdopendir.c

• /* Test opening a directory stream from a file descriptor.
     Copyright (C) 2009-2025 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 of the License, 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 <ebb9@byu.net>, 2009.  */
  
  #include <config.h>
  
  #include <dirent.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (fdopendir, DIR *, (int));
  
  #include <errno.h>
  #include <fcntl.h>
  #include <unistd.h>
  
  #include "macros.h"
  
  int
  main ()
  {
    DIR *d;
    int fd;
  
    /* A non-directory cannot be turned into a directory stream.  */
    fd = open ("test-fdopendir.tmp", O_RDONLY | O_CREAT, 0600);
    ASSERT (0 <= fd);
    errno = 0;
    ASSERT (fdopendir (fd) == NULL);
    ASSERT (errno == ENOTDIR);
    ASSERT (close (fd) == 0);
    ASSERT (unlink ("test-fdopendir.tmp") == 0);
  
    /* A bad fd cannot be turned into a stream.  */
    {
      errno = 0;
      ASSERT (fdopendir (-1) == NULL);
      ASSERT (errno == EBADF);
    }
    {
      close (99);
      errno = 0;
      ASSERT (fdopendir (99) == NULL);
      ASSERT (errno == EBADF);
    }
  #ifdef AT_FDCWD
    {
      errno = 0;
      ASSERT (fdopendir (AT_FDCWD) == NULL);
      ASSERT (errno == EBADF);
    }
  #endif
  
    /* This should work.  */
    fd = open (".", O_RDONLY);
    ASSERT (0 <= fd);
    d = fdopendir (fd);
    ASSERT (d);
    /* fdopendir should not close fd.  */
    ASSERT (dup2 (fd, fd) == fd);
  
    /* Don't test dirfd here.  dirfd (d) must return fd on current POSIX
       platforms, but on pre-2008 platforms or on non-POSIX platforms
       dirfd (fd) might return some other descriptor, or -1, and gnulib
       does not work around this porting problem.  */
  
    ASSERT (closedir (d) == 0);
    /* Now we can guarantee that fd must be closed.  */
    errno = 0;
    ASSERT (dup2 (fd, fd) == -1);
    ASSERT (errno == EBADF);
  
    return test_exit_status;
  }
  

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