1/* $OpenBSD: syslimits.h,v 1.16 2024/08/02 01:53:21 guenther Exp $ */
2/* $NetBSD: syslimits.h,v 1.12 1995/10/05 05:26:19 thorpej Exp $ */
3
4/*
5 * Copyright (c) 1988, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)syslimits.h 8.1 (Berkeley) 6/2/93
33 */
34
35#include <sys/cdefs.h>
36
37#if __POSIX_VISIBLE || __XPG_VISIBLE || __BSD_VISIBLE
38#define ARG_MAX (512 * 1024) /* max bytes for an exec function */
39#define CHILD_MAX 80 /* max simultaneous processes */
40#define LINK_MAX 32767 /* max file link count */
41#define MAX_CANON 255 /* max bytes in term canon input line */
42#define MAX_INPUT 255 /* max bytes in terminal input */
43#define NAME_MAX 255 /* max bytes in a file name */
44#define NGROUPS_MAX 16 /* max supplemental group id's */
45#define OPEN_MAX 64 /* max open files per process */
46#define PATH_MAX 1024 /* max bytes in pathname */
47#define PIPE_BUF 512 /* max bytes for atomic pipe writes */
48#define SYMLINK_MAX PATH_MAX /* max bytes in a symbolic link */
49#define SYMLOOP_MAX 32 /* max symlinks per path (for loops) */
50
51#define BC_BASE_MAX INT_MAX /* max ibase/obase values in bc(1) */
52#define BC_DIM_MAX 65535 /* max array elements in bc(1) */
53#define BC_SCALE_MAX INT_MAX /* max scale value in bc(1) */
54#define BC_STRING_MAX INT_MAX /* max const string length in bc(1) */
55#define COLL_WEIGHTS_MAX 2 /* max weights for order keyword */
56#define EXPR_NEST_MAX 32 /* max expressions nested in expr(1) */
57#define LINE_MAX 2048 /* max bytes in an input line */
58#ifndef RE_DUP_MAX
59#define RE_DUP_MAX 255 /* max RE's in interval notation */
60#define SEM_VALUE_MAX UINT_MAX /* max value of a sem_* semaphore */
61#endif
62
63#if __XPG_VISIBLE
64#define IOV_MAX 1024 /* max # of iov's (readv,sendmsg,etc) */
65#define NZERO 20 /* default "nice" */
66#endif /* __XPG_VISIBLE */
67
68#endif /* __POSIX_VISIBLE || __XPG_VISIBLE || __BSD_VISIBLE */
69
70#if __XPG_VISIBLE >= 500 || __POSIX_VISIBLE >= 199506 || __BSD_VISIBLE
71#define TTY_NAME_MAX 260 /* max tty device name length w/ NUL */
72#define LOGIN_NAME_MAX 32 /* max login name length w/ NUL */
73#endif /* __XPG_VISIBLE >= 500 || __POSIX_VISIBLE >= 199506 || __BSD_VISIBLE */
74
75#if __POSIX_VISIBLE >= 200112
76#define HOST_NAME_MAX 255 /* max hostname length w/o NUL */
77#endif
78
79#if __POSIX_VISIBLE >= 202405
80#define GETENTROPY_MAX 256 /* max bytes from getentropy(2) */
81#endif
82
83#define _MAXCOMLEN 24 /* includes NUL */