sysdeps/mach/hurd/opendir.c

   1 /* Copyright (C) 1993-2018 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 __opendirat (int dfd, const char *name)
  73 {
  74   if (name[0] == '\0')
  75     {
  76       /* POSIX.1-1990 says an empty name gets ENOENT;
  77          but `open' might like it fine.  */
  78       __set_errno (ENOENT);
  79       return NULL;
  80     }
  81
  82   int flags = O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC;
  83   int fd;
  84 #if IS_IN (rtld)
  85   assert (dfd == AT_FDCWD);
  86   fd = __open_nocancel (name, flags);
  87 #else
  88   fd = __openat_nocancel (dfd, name, flags);
  89 #endif
  90   if (fd < 0)
  91     return NULL;
  92
  93   /* Extract the pointer to the descriptor structure.  */
  94   DIR *dirp = _hurd_fd_opendir (_hurd_fd_get (fd));
  95   if (dirp == NULL)
  96     __close (fd);
  97
  98   return dirp;
  99 }
 100
 101
 102 /* Open a directory stream on NAME.  */
 103 DIR *
 104 __opendir (const char *name)
 105 {
 106 #if 0 /* TODO.  */
 107   return __opendirat (AT_FDCWD, name);
 108 #else
 109   if (name[0] == '\0')
 110     {
 111       /* POSIX.1-1990 says an empty name gets ENOENT;
 112          but `open' might like it fine.  */
 113       __set_errno (ENOENT);
 114       return NULL;
 115     }
 116
 117   int fd = __open (name, O_RDONLY | O_NONBLOCK | O_DIRECTORY);
 118   if (fd < 0)
 119     return NULL;
 120
 121   /* Extract the pointer to the descriptor structure.  */
 122   DIR *dirp = _hurd_fd_opendir (_hurd_fd_get (fd));
 123   if (dirp == NULL)
 124     __close (fd);
 125
 126   return dirp;
 127 #endif
 128 }
 129 weak_alias (__opendir, opendir)