sysdeps/unix/sysv/linux/device-nrs.h

   1 /* Device numbers of devices used in the implementation.  Linux version.
   2    Copyright (C) 2000, 2001 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _DEVICE_NRS_H
  21 #define _DEVICE_NRS_H   1
  22
  23 #include <sys/sysmacros.h>
  24
  25 /* /dev/null is (1,3).  */
  26 #define DEV_NULL_MAJOR  1
  27 #define DEV_NULL_MINOR  3
  28
  29 /* Pseudo tty slaves.  For Linux we use the Unix98 ttys.  We could
  30    also include the old BSD-style tty buts they should not be used and
  31    the extra test would only slow down correctly set up systems.  If a
  32    system still uses those device the slower tests performed (using
  33    isatty) will catch it.  */
  34 #define DEV_TTY_LOW_MAJOR       136
  35 #define DEV_TTY_HIGH_MAJOR      143
  36
  37 /* Test whether given device is a tty.  */
  38 #define DEV_TTY_P(statp) \
  39   ({ int __dev_major = major ((statp)->st_rdev);                              \
  40      __dev_major >= DEV_TTY_LOW_MAJOR && __dev_major <= DEV_TTY_HIGH_MAJOR; })
  41
  42 #endif  /* device-nrs.h */