1  /* Device numbers of devices used in the implementation.  Linux version.
       2     Copyright (C) 2000-2023 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 */