1/* Copyright (C) 1991-2018 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 <http://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
28/* These are the standard-mandated minimum values. */
29
30/* Minimum number of operations in one list I/O call. */
31#define _POSIX_AIO_LISTIO_MAX 2
32
33/* Minimal number of outstanding asynchronous I/O operations. */
34#define _POSIX_AIO_MAX 1
35
36/* Maximum length of arguments to `execve', including environment. */
37#define _POSIX_ARG_MAX 4096
38
39/* Maximum simultaneous processes per real user ID. */
40#ifdef __USE_XOPEN2K
41# define _POSIX_CHILD_MAX 25
42#else
43# define _POSIX_CHILD_MAX 6
44#endif
45
46/* Minimal number of timer expiration overruns. */
47#define _POSIX_DELAYTIMER_MAX 32
48
49/* Maximum length of a host name (not including the terminating null)
50 as returned from the GETHOSTNAME function. */
51#define _POSIX_HOST_NAME_MAX 255
52
53/* Maximum link count of a file. */
54#define _POSIX_LINK_MAX 8
55
56/* Maximum length of login name. */
57#define _POSIX_LOGIN_NAME_MAX 9
58
59/* Number of bytes in a terminal canonical input queue. */
60#define _POSIX_MAX_CANON 255
61
62/* Number of bytes for which space will be
63 available in a terminal input queue. */
64#define _POSIX_MAX_INPUT 255
65
66/* Maximum number of message queues open for a process. */
67#define _POSIX_MQ_OPEN_MAX 8
68
69/* Maximum number of supported message priorities. */
70#define _POSIX_MQ_PRIO_MAX 32
71
72/* Number of bytes in a filename. */
73#define _POSIX_NAME_MAX 14
74
75/* Number of simultaneous supplementary group IDs per process. */
76#ifdef __USE_XOPEN2K
77# define _POSIX_NGROUPS_MAX 8
78#else
79# define _POSIX_NGROUPS_MAX 0
80#endif
81
82/* Number of files one process can have open at once. */
83#ifdef __USE_XOPEN2K
84# define _POSIX_OPEN_MAX 20
85#else
86# define _POSIX_OPEN_MAX 16
87#endif
88
89#if !defined __USE_XOPEN2K || defined __USE_GNU
90/* Number of descriptors that a process may examine with `pselect' or
91 `select'. */
92# define _POSIX_FD_SETSIZE _POSIX_OPEN_MAX
93#endif
94
95/* Number of bytes in a pathname. */
96#define _POSIX_PATH_MAX 256
97
98/* Number of bytes than can be written atomically to a pipe. */
99#define _POSIX_PIPE_BUF 512
100
101/* The number of repeated occurrences of a BRE permitted by the
102 REGEXEC and REGCOMP functions when using the interval notation. */
103#define _POSIX_RE_DUP_MAX 255
104
105/* Minimal number of realtime signals reserved for the application. */
106#define _POSIX_RTSIG_MAX 8
107
108/* Number of semaphores a process can have. */
109#define _POSIX_SEM_NSEMS_MAX 256
110
111/* Maximal value of a semaphore. */
112#define _POSIX_SEM_VALUE_MAX 32767
113
114/* Number of pending realtime signals. */
115#define _POSIX_SIGQUEUE_MAX 32
116
117/* Largest value of a `ssize_t'. */
118#define _POSIX_SSIZE_MAX 32767
119
120/* Number of streams a process can have open at once. */
121#define _POSIX_STREAM_MAX 8
122
123/* The number of bytes in a symbolic link. */
124#define _POSIX_SYMLINK_MAX 255
125
126/* The number of symbolic links that can be traversed in the
127 resolution of a pathname in the absence of a loop. */
128#define _POSIX_SYMLOOP_MAX 8
129
130/* Number of timer for a process. */
131#define _POSIX_TIMER_MAX 32
132
133/* Maximum number of characters in a tty name. */
134#define _POSIX_TTY_NAME_MAX 9
135
136/* Maximum length of a timezone name (element of `tzname'). */
137#ifdef __USE_XOPEN2K
138# define _POSIX_TZNAME_MAX 6
139#else
140# define _POSIX_TZNAME_MAX 3
141#endif
142
143#if !defined __USE_XOPEN2K || defined __USE_GNU
144/* Maximum number of connections that can be queued on a socket. */
145# define _POSIX_QLIMIT 1
146
147/* Maximum number of bytes that can be buffered on a socket for send
148 or receive. */
149# define _POSIX_HIWAT _POSIX_PIPE_BUF
150
151/* Maximum number of elements in an `iovec' array. */
152# define _POSIX_UIO_MAXIOV 16
153#endif
154
155/* Maximum clock resolution in nanoseconds. */
156#define _POSIX_CLOCKRES_MIN 20000000
157
158
159/* Get the implementation-specific values for the above. */
160#include <bits/local_lim.h>
161
162
163#ifndef SSIZE_MAX
164# define SSIZE_MAX LONG_MAX
165#endif
166
167
168/* This value is a guaranteed minimum maximum.
169 The current maximum can be got from `sysconf'. */
170
171#ifndef NGROUPS_MAX
172# define NGROUPS_MAX 8
173#endif
174
175#endif /* bits/posix1_lim.h */
176