FreeBSD/Linux Kernel Cross Reference
sys/sys/syslimits.h
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)syslimits.h 8.1 (Berkeley) 6/2/93
32 * $FreeBSD$
33 */
34
35 #ifndef _SYS_SYSLIMITS_H_
36 #define _SYS_SYSLIMITS_H_
37
38 #if !defined(_STANDALONE) && !defined(_KERNEL) && !defined(_LIMITS_H_) && !defined(_SYS_PARAM_H_)
39 #ifndef _SYS_CDEFS_H_
40 #error this file needs sys/cdefs.h as a prerequisite
41 #endif
42 #ifdef __CC_SUPPORTS_WARNING
43 #warning "No user-serviceable parts inside."
44 #endif
45 #endif
46
47 /*
48 * Do not add any new variables here. (See the comment at the end of
49 * the file for why.)
50 */
51 #ifndef __ILP32__
52 #define ARG_MAX (2 * 256 * 1024) /* max bytes for an exec function */
53 #else
54 #define ARG_MAX (256 * 1024) /* max bytes for KVA-starved archs */
55 #endif
56 #ifndef CHILD_MAX
57 #define CHILD_MAX 40 /* max simultaneous processes */
58 #endif
59 #define MAX_CANON 255 /* max bytes in term canon input line */
60 #define MAX_INPUT 255 /* max bytes in terminal input */
61 #define NAME_MAX 255 /* max bytes in a file name */
62 #ifndef NGROUPS_MAX
63 #define NGROUPS_MAX 1023 /* max supplemental group id's */
64 #endif
65 #ifndef OPEN_MAX
66 #define OPEN_MAX 64 /* max open files per process */
67 #endif
68 #define PATH_MAX 1024 /* max bytes in pathname */
69 #define PIPE_BUF 512 /* max bytes for atomic pipe writes */
70 #define IOV_MAX 1024 /* max elements in i/o vector */
71
72 /*
73 * We leave the following values undefined to force applications to either
74 * assume conservative values or call sysconf() to get the current value.
75 *
76 * HOST_NAME_MAX
77 *
78 * (We should do this for most of the values currently defined here,
79 * but many programs are not prepared to deal with this yet.)
80 */
81 #endif
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