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 | |