glibc (2.38)
1 /* Copyright (C) 1996-2023 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 */
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