sysdeps/mach/hurd/opendir.c

   1 /* Copyright (C) 1993-2024 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    <https://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     return __hurd_fail (EBADF), NULL;
  44
  45   dirp = (DIR *) malloc (sizeof (DIR));
  46   if (dirp == NULL)
  47     return NULL;
  48
  49   /* Set the descriptor to close on exec. */
  50   HURD_CRITICAL_BEGIN;
  51   __spin_lock (&d->port.lock);
  52   d->flags |= FD_CLOEXEC;
  53   __spin_unlock (&d->port.lock);
  54   HURD_CRITICAL_END;
  55
  56   dirp->__fd = d;
  57   dirp->__data = dirp->__ptr = NULL;
  58   dirp->__entry_data = dirp->__entry_ptr = 0;
  59   dirp->__allocation = 0;
  60   dirp->__size = 0;
  61
  62   __libc_lock_init (dirp->__lock);
  63
  64   return dirp;
  65 }
  66
  67
  68 DIR *
  69 __opendirat (int dfd, const char *name)
  70 {
  71   if (name[0] == '\0')
  72     /* POSIX.1-1990 says an empty name gets ENOENT;
  73        but `open' might like it fine.  */
  74     return __hurd_fail (ENOENT), NULL;
  75
  76   int flags = O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC;
  77   int fd;
  78 #if IS_IN (rtld)
  79   assert (dfd == AT_FDCWD);
  80   fd = __open_nocancel (name, flags);
  81 #else
  82   fd = __openat_nocancel (dfd, name, flags);
  83 #endif
  84   if (fd < 0)
  85     return NULL;
  86
  87   /* Extract the pointer to the descriptor structure.  */
  88   DIR *dirp = _hurd_fd_opendir (_hurd_fd_get (fd));
  89   if (dirp == NULL)
  90     __close (fd);
  91
  92   return dirp;
  93 }
  94
  95
  96 /* Open a directory stream on NAME.  */
  97 DIR *
  98 __opendir (const char *name)
  99 {
 100 #if 0 /* TODO.  */
 101   return __opendirat (AT_FDCWD, name);
 102 #else
 103   if (name[0] == '\0')
 104     /* POSIX.1-1990 says an empty name gets ENOENT;
 105        but `open' might like it fine.  */
 106     return __hurd_fail (ENOENT), NULL;
 107
 108   int fd = __open (name, O_RDONLY | O_NONBLOCK | O_DIRECTORY);
 109   if (fd < 0)
 110     return NULL;
 111
 112   /* Extract the pointer to the descriptor structure.  */
 113   DIR *dirp = _hurd_fd_opendir (_hurd_fd_get (fd));
 114   if (dirp == NULL)
 115     __close (fd);
 116
 117   return dirp;
 118 #endif
 119 }
 120 weak_alias (__opendir, opendir)