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

   1 /* Device numbers of devices used in the implementation.  Linux version.
   2    Copyright (C) 2000-2024 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, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _DEVICE_NRS_H
  20 #define _DEVICE_NRS_H   1
  21
  22 #include <sys/sysmacros.h>
  23
  24 /* /dev/null is (1,3).  */
  25 #define DEV_NULL_MAJOR  1
  26 #define DEV_NULL_MINOR  3
  27
  28 /* /dev/full is (1,7).  */
  29 #define DEV_FULL_MAJOR  1
  30 #define DEV_FULL_MINOR  7
  31
  32 /* Pseudo tty slaves.  For Linux we use the Unix98 ttys.  We could
  33    also include the old BSD-style tty buts they should not be used and
  34    the extra test would only slow down correctly set up systems.  If a
  35    system still uses those device the slower tests performed (using
  36    isatty) will catch it.  */
  37 #define DEV_TTY_LOW_MAJOR       136
  38 #define DEV_TTY_HIGH_MAJOR      143
  39
  40 /* Test whether given device is a tty.  */
  41 #define DEV_TTY_P(statp) \
  42   ({ int __dev_major = __gnu_dev_major ((statp)->st_rdev);                    \
  43      __dev_major >= DEV_TTY_LOW_MAJOR && __dev_major <= DEV_TTY_HIGH_MAJOR; })
  44
  45 #endif  /* device-nrs.h */