sysdeps/mach/hurd/opendir.c

   1 /* Copyright (C) 1993-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <limits.h>
  20 #include <stddef.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <dirent.h>
  24 #include <fcntl.h>
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <unistd.h>
  28 #include <stdio.h>
  29 #include <hurd.h>
  30 #include <hurd/fd.h>
  31 #include <not-cancel.h>
  32 #include "dirstream.h"
  33
  34
  35 /* Open a directory stream on a file descriptor in Hurd internal form.
  36    We do no checking here on the descriptor.  */
  37 DIR *
  38 _hurd_fd_opendir (struct hurd_fd *d)
  39 {
  40   DIR *dirp;
  41
  42   if (d == NULL)
  43     {
  44       errno = EBADF;
  45       return NULL;
  46     }
  47
  48   dirp = (DIR *) malloc (sizeof (DIR));
  49   if (dirp == NULL)
  50     return NULL;
  51
  52   /* Set the descriptor to close on exec. */
  53   HURD_CRITICAL_BEGIN;
  54   __spin_lock (&d->port.lock);
  55   d->flags |= FD_CLOEXEC;
  56   __spin_unlock (&d->port.lock);
  57   HURD_CRITICAL_END;
  58
  59   dirp->__fd = d;
  60   dirp->__data = dirp->__ptr = NULL;
  61   dirp->__entry_data = dirp->__entry_ptr = 0;
  62   dirp->__allocation = 0;
  63   dirp->__size = 0;
  64
  65   __libc_lock_init (dirp->__lock);
  66
  67   return dirp;
  68 }
  69
  70
  71 DIR *
  72 internal_function
  73 __opendirat (int dfd, const char *name)
  74 {
  75   if (name[0] == '\0')
  76     {
  77       /* POSIX.1-1990 says an empty name gets ENOENT;
  78          but `open' might like it fine.  */
  79       __set_errno (ENOENT);
  80       return NULL;
  81     }
  82
  83   int flags = O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC;
  84   int fd;
  85 #ifdef IS_IN_rtld
  86   assert (dfd == AT_FDCWD);
  87   fd = open_not_cancel_2 (name, flags);
  88 #else
  89   fd = openat_not_cancel_3 (dfd, name, flags);
  90 #endif
  91   if (fd < 0)
  92     return NULL;
  93
  94   /* Extract the pointer to the descriptor structure.  */
  95   DIR *dirp = _hurd_fd_opendir (_hurd_fd_get (fd));
  96   if (dirp == NULL)
  97     __close (fd);
  98
  99   return dirp;
 100 }
 101
 102
 103 /* Open a directory stream on NAME.  */
 104 DIR *
 105 __opendir (const char *name)
 106 {
 107 #if 0 /* TODO.  */
 108   return __opendirat (AT_FDCWD, name);
 109 #else
 110   if (name[0] == '\0')
 111     {
 112       /* POSIX.1-1990 says an empty name gets ENOENT;
 113          but `open' might like it fine.  */
 114       __set_errno (ENOENT);
 115       return NULL;
 116     }
 117
 118   int fd = __open (name, O_RDONLY | O_NONBLOCK | O_DIRECTORY);
 119   if (fd < 0)
 120     return NULL;
 121
 122   /* Extract the pointer to the descriptor structure.  */
 123   DIR *dirp = _hurd_fd_opendir (_hurd_fd_get (fd));
 124   if (dirp == NULL)
 125     __close (fd);
 126
 127   return dirp;
 128 #endif
 129 }
 130 weak_alias (__opendir, opendir)