1 /* Copyright (C) 1996-2022 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 /* 19 * Never include this file directly; use <limits.h> instead. 20 */ 21 22 /* Additional definitions from X/Open Portability Guide, Issue 4, Version 2 23 System Interfaces and Headers, 4.16 <limits.h> 24 25 Please note only the values which are not greater than the minimum 26 stated in the standard document are listed. The `sysconf' functions 27 should be used to obtain the actual value. */ 28 29 #ifndef _XOPEN_LIM_H 30 #define _XOPEN_LIM_H 1 31 32 /* We do not provide fixed values for 33 34 ARG_MAX Maximum length of argument to the `exec' function 35 including environment data. 36 37 ATEXIT_MAX Maximum number of functions that may be registered 38 with `atexit'. 39 40 CHILD_MAX Maximum number of simultaneous processes per real 41 user ID. 42 43 OPEN_MAX Maximum number of files that one process can have open 44 at anyone time. 45 46 PAGESIZE 47 PAGE_SIZE Size of bytes of a page. 48 49 PASS_MAX Maximum number of significant bytes in a password. 50 51 We only provide a fixed limit for 52 53 IOV_MAX Maximum number of `iovec' structures that one process has 54 available for use with `readv' or writev'. 55 56 if this is indeed fixed by the underlying system. 57 */ 58 59 60 /* Maximum number of `iovec' structures that may be used in a single call 61 to `readv', `writev', etc. */ 62 #define _XOPEN_IOV_MAX _POSIX_UIO_MAXIOV 63 64 #include <bits/uio_lim.h> 65 #ifdef __IOV_MAX 66 # define IOV_MAX __IOV_MAX 67 #else 68 # undef IOV_MAX 69 #endif 70 71 /* Maximum value of `digit' in calls to the `printf' and `scanf' 72 functions. We have no limit, so return a reasonable value. */ 73 #define NL_ARGMAX _POSIX_ARG_MAX 74 75 /* Maximum number of bytes in a `LANG' name. We have no limit. */ 76 #define NL_LANGMAX _POSIX2_LINE_MAX 77 78 /* Maximum message number. We have no limit. */ 79 #define NL_MSGMAX INT_MAX 80 81 /* Maximum number of bytes in N-to-1 collation mapping. We have no 82 limit. */ 83 #if defined __USE_GNU || !defined __USE_XOPEN2K8 84 # define NL_NMAX INT_MAX 85 #endif 86 87 /* Maximum set number. We have no limit. */ 88 #define NL_SETMAX INT_MAX 89 90 /* Maximum number of bytes in a message. We have no limit. */ 91 #define NL_TEXTMAX INT_MAX 92 93 /* Default process priority. */ 94 #define NZERO 20 95 96 97 /* Number of bits in a word of type `int'. */ 98 #ifdef INT_MAX 99 # if INT_MAX == 32767 100 # define WORD_BIT 16 101 # else 102 # if INT_MAX == 2147483647 103 # define WORD_BIT 32 104 # else 105 /* Safe assumption. */ 106 # define WORD_BIT 64 107 # endif 108 # endif 109 #elif defined __INT_MAX__ 110 # if __INT_MAX__ == 32767 111 # define WORD_BIT 16 112 # else 113 # if __INT_MAX__ == 2147483647 114 # define WORD_BIT 32 115 # else 116 /* Safe assumption. */ 117 # define WORD_BIT 64 118 # endif 119 # endif 120 #else 121 # define WORD_BIT 32 122 #endif 123 124 /* Number of bits in a word of type `long int'. */ 125 #ifdef LONG_MAX 126 # if LONG_MAX == 2147483647 127 # define LONG_BIT 32 128 # else 129 /* Safe assumption. */ 130 # define LONG_BIT 64 131 # endif 132 #elif defined __LONG_MAX__ 133 # if __LONG_MAX__ == 2147483647 134 # define LONG_BIT 32 135 # else 136 /* Safe assumption. */ 137 # define LONG_BIT 64 138 # endif 139 #else 140 # include <bits/wordsize.h> 141 # if __WORDSIZE == 64 142 # define LONG_BIT 64 143 # else 144 # define LONG_BIT 32 145 # endif 146 #endif 147 148 #endif /* bits/xopen_lim.h */ 149