sysdeps/mach/hurd/xmknod.c

   1 /* Copyright (C) 1991,92,93,94,95,96,99,2002 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 <sys/stat.h>
  21 #include <hurd.h>
  22 #include <hurd/paths.h>
  23 #include <fcntl.h>
  24 #include "stdio-common/_itoa.h"
  25 #include <string.h>
  26 #include <sys/types.h>
  27
  28
  29 /* Create a device file named FILE_NAME, with permission and special bits MODE
  30    and device number DEV (which can be constructed from major and minor
  31    device numbers with the `makedev' macro above).  */
  32 int
  33 __xmknod (int vers, const char *file_name, mode_t mode, dev_t *dev)
  34 {
  35   error_t err;
  36   file_t dir, node;
  37   char *name;
  38   char buf[100], *bp;
  39   const char *translator;
  40   size_t len;
  41
  42   if (vers != _MKNOD_VER)
  43     return __hurd_fail (EINVAL);
  44
  45   if (S_ISCHR (mode))
  46     {
  47       translator = _HURD_CHRDEV;
  48       len = sizeof (_HURD_CHRDEV);
  49     }
  50   else if (S_ISBLK (mode))
  51     {
  52       translator = _HURD_BLKDEV;
  53       len = sizeof (_HURD_BLKDEV);
  54     }
  55   else if (S_ISFIFO (mode))
  56     {
  57       translator = _HURD_FIFO;
  58       len = sizeof (_HURD_FIFO);
  59     }
  60   else
  61     {
  62       errno = EINVAL;
  63       return -1;
  64     }
  65
  66   if (! S_ISFIFO (mode))
  67     {
  68       /* We set the translator to "ifmt\0major\0minor\0", where IFMT
  69          depends on the S_IFMT bits of our MODE argument, and MAJOR and
  70          MINOR are ASCII decimal (octal or hex would do as well)
  71          representations of our arguments.  Thus the convention is that
  72          CHRDEV and BLKDEV translators are invoked with two non-switch
  73          arguments, giving the major and minor device numbers in %i format. */
  74
  75       bp = buf + sizeof (buf);
  76       *--bp = '\0';
  77       bp = _itoa (minor (*dev), bp, 10, 0);
  78       *--bp = '\0';
  79       bp = _itoa (major (*dev), bp, 10, 0);
  80       memcpy (bp - len, translator, len);
  81       translator = bp - len;
  82       len = buf + sizeof (buf) - translator;
  83     }
  84
  85   dir = __file_name_split (file_name, &name);
  86   if (dir == MACH_PORT_NULL)
  87     return -1;
  88
  89   /* Create a new, unlinked node in the target directory.  */
  90   err = __dir_mkfile (dir, O_WRITE, (mode & ~S_IFMT) & ~_hurd_umask, &node);
  91
  92   if (! err)
  93     /* Set the node's translator to make it a device.  */
  94     err = __file_set_translator (node,
  95                                  FS_TRANS_EXCL | FS_TRANS_SET,
  96                                  FS_TRANS_EXCL | FS_TRANS_SET, 0,
  97                                  translator, len,
  98                                  MACH_PORT_NULL, MACH_MSG_TYPE_COPY_SEND);
  99
 100   if (! err)
 101     /* Link the node, now a valid device, into the target directory.  */
 102     err = __dir_link (dir, node, name, 1);
 103
 104   __mach_port_deallocate (__mach_task_self (), dir);
 105   __mach_port_deallocate (__mach_task_self (), node);
 106
 107   if (err)
 108     return __hurd_fail (err);
 109   return 0;
 110 }
 111 libc_hidden_def (__xmknod)