1 /* Copyright (C) 2020-2022 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 Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the 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 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #ifndef _UNISTD_H 19 # error "Never include this file directly. Use <unistd.h> instead" 20 #endif 21 22 #include <bits/wordsize.h> 23 24 /* This header should define the following symbols under the described 25 situations. A value `1' means that the model is always supported, 26 `-1' means it is never supported. Undefined means it cannot be 27 statically decided. 28 29 _POSIX_V7_ILP32_OFF32 32bit int, long, pointers, and off_t type 30 _POSIX_V7_ILP32_OFFBIG 32bit int, long, and pointers and larger off_t type 31 32 _POSIX_V7_LP64_OFF32 64bit long and pointers and 32bit off_t type 33 _POSIX_V7_LPBIG_OFFBIG 64bit long and pointers and large off_t type 34 35 The macros _POSIX_V6_ILP32_OFF32, _POSIX_V6_ILP32_OFFBIG, 36 _POSIX_V6_LP64_OFF32, _POSIX_V6_LPBIG_OFFBIG, _XBS5_ILP32_OFF32, 37 _XBS5_ILP32_OFFBIG, _XBS5_LP64_OFF32, and _XBS5_LPBIG_OFFBIG were 38 used in previous versions of the Unix standard and are available 39 only for compatibility. 40 */ 41 42 #if __WORDSIZE == 64 43 44 /* We can never provide environments with 32-bit wide pointers. */ 45 # define _POSIX_V7_ILP32_OFF32 -1 46 # define _POSIX_V7_ILP32_OFFBIG -1 47 # define _POSIX_V6_ILP32_OFF32 -1 48 # define _POSIX_V6_ILP32_OFFBIG -1 49 # define _XBS5_ILP32_OFF32 -1 50 # define _XBS5_ILP32_OFFBIG -1 51 /* We also have no use (for now) for an environment with bigger pointers 52 and offsets. */ 53 # define _POSIX_V7_LPBIG_OFFBIG -1 54 # define _POSIX_V6_LPBIG_OFFBIG -1 55 # define _XBS5_LPBIG_OFFBIG -1 56 57 /* By default we have 64-bit wide `long int', pointers and `off_t'. */ 58 # define _POSIX_V7_LP64_OFF64 1 59 # define _POSIX_V6_LP64_OFF64 1 60 # define _XBS5_LP64_OFF64 1 61 62 #else /* __WORDSIZE == 32 */ 63 64 /* RISC-V requires 64-bit off_t */ 65 # define _POSIX_V7_ILP32_OFF32 -1 66 # define _POSIX_V6_ILP32_OFF32 -1 67 # define _XBS5_ILP32_OFF32 -1 68 69 # define _POSIX_V7_ILP32_OFFBIG 1 70 # define _POSIX_V6_ILP32_OFFBIG 1 71 # define _XBS5_ILP32_OFFBIG 1 72 73 /* We can never provide environments with 64-bit wide pointers. */ 74 # define _POSIX_V7_LP64_OFF64 -1 75 # define _POSIX_V7_LPBIG_OFFBIG -1 76 # define _POSIX_V6_LP64_OFF64 -1 77 # define _POSIX_V6_LPBIG_OFFBIG -1 78 # define _XBS5_LP64_OFF64 -1 79 # define _XBS5_LPBIG_OFFBIG -1 80 81 #endif /* __WORDSIZE == 32 */ 82