io/xmknodat.c

   1 /* Copyright (C) 2005 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <stddef.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24
  25 /* Create a device file named PATH relative to FD, with permission and
  26    special bits MODE and device number DEV (which can be constructed
  27    from major and minor device numbers with the `makedev' macro
  28    above).  */
  29 int
  30 __xmknodat (int vers, int fd, const char *path, mode_t mode, dev_t *dev)
  31 {
  32   if (vers != _MKNOD_VER)
  33     {
  34       __set_errno (EINVAL);
  35       return -1;
  36     }
  37
  38   if (path == NULL)
  39     {
  40       __set_errno (EINVAL);
  41       return -1;
  42     }
  43
  44   if (fd != AT_FDCWD && path[0] != '/')
  45     {
  46       /* Check FD is associated with a directory.  */
  47       struct stat64 st;
  48       if (__fxstat64 (_STAT_VER, fd, &st) != 0)
  49         return -1;
  50
  51       if (!S_ISDIR (st.st_mode))
  52         {
  53           __set_errno (ENOTDIR);
  54           return -1;
  55         }
  56     }
  57
  58   __set_errno (ENOSYS);
  59   return -1;
  60 }
  61 stub_warning (__xmknodat)
  62
  63 libc_hidden_def (__xmknodat)
  64 #include <stub-tag.h>