sysdeps/mach/hurd/mknod.c

   1 /* Copyright (C) 1991, 1992, 1993, 1994, 1995 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <sys/stat.h>
  22 #include <hurd.h>
  23 #include <hurd/paths.h>
  24 #include <fcntl.h>
  25 #include "stdio/_itoa.h"
  26 #include <string.h>
  27
  28 /* Temporary hack; this belongs in a header file, probably types.h. */
  29 #define major(x) ((int)(((unsigned) (x) >> 8) & 0xff))
  30 #define minor(x) ((int)((x) & 0xff))
  31
  32
  33 /* Create a device file named FILE_NAME, with permission and special bits MODE
  34    and device number DEV (which can be constructed from major and minor
  35    device numbers with the `makedev' macro above).  */
  36 int
  37 DEFUN(__mknod, (file_name, mode, dev),
  38       CONST char *file_name AND mode_t mode AND dev_t dev)
  39 {
  40   error_t err;
  41   file_t dir, node;
  42   char *name;
  43   char buf[100], *bp;
  44   const char *translator;
  45   size_t len;
  46
  47   if (S_ISCHR (mode))
  48     {
  49       translator = _HURD_CHRDEV;
  50       len = sizeof (_HURD_CHRDEV);
  51     }
  52   else if (S_ISBLK (mode))
  53     {
  54       translator = _HURD_BLKDEV;
  55       len = sizeof (_HURD_BLKDEV);
  56     }
  57   else if (S_ISFIFO (mode))
  58     {
  59       translator = _HURD_FIFO;
  60       len = sizeof (_HURD_FIFO);
  61     }
  62   else
  63     {
  64       errno = EINVAL;
  65       return -1;
  66     }
  67
  68   if (! S_ISFIFO (mode))
  69     {
  70       /* We set the translator to "ifmt\0major\0minor\0", where IFMT
  71          depends on the S_IFMT bits of our MODE argument, and MAJOR and
  72          MINOR are ASCII decimal (octal or hex would do as well)
  73          representations of our arguments.  Thus the convention is that
  74          CHRDEV and BLKDEV translators are invoked with two non-switch
  75          arguments, giving the major and minor device numbers in %i format. */
  76
  77       bp = buf + sizeof (buf);
  78       *--bp = '\0';
  79       bp = _itoa (minor (dev), bp, 10, 0);
  80       *--bp = '\0';
  81       bp = _itoa (major (dev), bp, 10, 0);
  82       memcpy (bp - len, translator, len);
  83       translator = bp - len;
  84       len = buf + sizeof (buf) - translator;
  85     }
  86
  87   dir = __file_name_split (file_name, &name);
  88   if (dir == MACH_PORT_NULL)
  89     return -1;
  90
  91   /* Create a new, unlinked node in the target directory.  */
  92   err = __dir_mkfile (dir, O_WRITE, mode & ~S_IFMT & _hurd_umask, &node);
  93
  94   if (! err)
  95     /* Set the node's translator to make it a device.  */
  96     err = __file_set_translator (node,
  97                                  FS_TRANS_EXCL | FS_TRANS_SET,
  98                                  FS_TRANS_EXCL | FS_TRANS_SET, 0,
  99                                  translator, len,
 100                                  MACH_PORT_NULL, MACH_MSG_TYPE_COPY_SEND);
 101
 102   if (! err)
 103     /* Link the node, now a valid device, into the target directory.  */
 104     err = __dir_link (node, dir, name);
 105
 106   __mach_port_deallocate (__mach_task_self (), dir);
 107   __mach_port_deallocate (__mach_task_self (), node);
 108
 109   if (err)
 110     return __hurd_fail (err);
 111   return 0;
 112 }
 113
 114 weak_alias (__mknod, mknod)