1 /* Copyright (C) 1991-2023 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 * POSIX Standard: 2.9.2 Minimum Values Added to <limits.h>
20 *
21 * Never include this file directly; use <limits.h> instead.
22 */
23
24 #ifndef _BITS_POSIX1_LIM_H
25 #define _BITS_POSIX1_LIM_H 1
26
27 #include <bits/wordsize.h>
28
29 /* These are the standard-mandated minimum values. */
30
31 /* Minimum number of operations in one list I/O call. */
32 #define _POSIX_AIO_LISTIO_MAX 2
33
34 /* Minimal number of outstanding asynchronous I/O operations. */
35 #define _POSIX_AIO_MAX 1
36
37 /* Maximum length of arguments to `execve', including environment. */
38 #define _POSIX_ARG_MAX 4096
39
40 /* Maximum simultaneous processes per real user ID. */
41 #ifdef __USE_XOPEN2K
42 # define _POSIX_CHILD_MAX 25
43 #else
44 # define _POSIX_CHILD_MAX 6
45 #endif
46
47 /* Minimal number of timer expiration overruns. */
48 #define _POSIX_DELAYTIMER_MAX 32
49
50 /* Maximum length of a host name (not including the terminating null)
51 as returned from the GETHOSTNAME function. */
52 #define _POSIX_HOST_NAME_MAX 255
53
54 /* Maximum link count of a file. */
55 #define _POSIX_LINK_MAX 8
56
57 /* Maximum length of login name. */
58 #define _POSIX_LOGIN_NAME_MAX 9
59
60 /* Number of bytes in a terminal canonical input queue. */
61 #define _POSIX_MAX_CANON 255
62
63 /* Number of bytes for which space will be
64 available in a terminal input queue. */
65 #define _POSIX_MAX_INPUT 255
66
67 /* Maximum number of message queues open for a process. */
68 #define _POSIX_MQ_OPEN_MAX 8
69
70 /* Maximum number of supported message priorities. */
71 #define _POSIX_MQ_PRIO_MAX 32
72
73 /* Number of bytes in a filename. */
74 #define _POSIX_NAME_MAX 14
75
76 /* Number of simultaneous supplementary group IDs per process. */
77 #ifdef __USE_XOPEN2K
78 # define _POSIX_NGROUPS_MAX 8
79 #else
80 # define _POSIX_NGROUPS_MAX 0
81 #endif
82
83 /* Number of files one process can have open at once. */
84 #ifdef __USE_XOPEN2K
85 # define _POSIX_OPEN_MAX 20
86 #else
87 # define _POSIX_OPEN_MAX 16
88 #endif
89
90 #if !defined __USE_XOPEN2K || defined __USE_GNU
91 /* Number of descriptors that a process may examine with `pselect' or
92 `select'. */
93 # define _POSIX_FD_SETSIZE _POSIX_OPEN_MAX
94 #endif
95
96 /* Number of bytes in a pathname. */
97 #define _POSIX_PATH_MAX 256
98
99 /* Number of bytes than can be written atomically to a pipe. */
100 #define _POSIX_PIPE_BUF 512
101
102 /* The number of repeated occurrences of a BRE permitted by the
103 REGEXEC and REGCOMP functions when using the interval notation. */
104 #define _POSIX_RE_DUP_MAX 255
105
106 /* Minimal number of realtime signals reserved for the application. */
107 #define _POSIX_RTSIG_MAX 8
108
109 /* Number of semaphores a process can have. */
110 #define _POSIX_SEM_NSEMS_MAX 256
111
112 /* Maximal value of a semaphore. */
113 #define _POSIX_SEM_VALUE_MAX 32767
114
115 /* Number of pending realtime signals. */
116 #define _POSIX_SIGQUEUE_MAX 32
117
118 /* Largest value of a `ssize_t'. */
119 #define _POSIX_SSIZE_MAX 32767
120
121 /* Number of streams a process can have open at once. */
122 #define _POSIX_STREAM_MAX 8
123
124 /* The number of bytes in a symbolic link. */
125 #define _POSIX_SYMLINK_MAX 255
126
127 /* The number of symbolic links that can be traversed in the
128 resolution of a pathname in the absence of a loop. */
129 #define _POSIX_SYMLOOP_MAX 8
130
131 /* Number of timer for a process. */
132 #define _POSIX_TIMER_MAX 32
133
134 /* Maximum number of characters in a tty name. */
135 #define _POSIX_TTY_NAME_MAX 9
136
137 /* Maximum length of a time zone abbreviation (element of 'tzname'). */
138 #ifdef __USE_XOPEN2K
139 # define _POSIX_TZNAME_MAX 6
140 #else
141 # define _POSIX_TZNAME_MAX 3
142 #endif
143
144 #if !defined __USE_XOPEN2K || defined __USE_GNU
145 /* Maximum number of connections that can be queued on a socket. */
146 # define _POSIX_QLIMIT 1
147
148 /* Maximum number of bytes that can be buffered on a socket for send
149 or receive. */
150 # define _POSIX_HIWAT _POSIX_PIPE_BUF
151
152 /* Maximum number of elements in an `iovec' array. */
153 # define _POSIX_UIO_MAXIOV 16
154 #endif
155
156 /* Maximum clock resolution in nanoseconds. */
157 #define _POSIX_CLOCKRES_MIN 20000000
158
159
160 /* Get the implementation-specific values for the above. */
161 #include <bits/local_lim.h>
162
163
164 #ifndef SSIZE_MAX
165 /* ssize_t is not formally required to be the signed type
166 corresponding to size_t, but it is for all configurations supported
167 by glibc. */
168 # if __WORDSIZE == 64 || __WORDSIZE32_SIZE_ULONG
169 # define SSIZE_MAX LONG_MAX
170 # else
171 # define SSIZE_MAX INT_MAX
172 # endif
173 #endif
174
175
176 /* This value is a guaranteed minimum maximum.
177 The current maximum can be got from `sysconf'. */
178
179 #ifndef NGROUPS_MAX
180 # define NGROUPS_MAX 8
181 #endif
182
183 #endif /* bits/posix1_lim.h */