1 /* Device numbers of devices used in the implementation. Linux version. 2 Copyright (C) 2000-2022 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 */ 46