FreeBSD/Linux Kernel Cross Reference
sys/sys/syslimits.h
1 /*-
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)syslimits.h 8.1 (Berkeley) 6/2/93
30 * $FreeBSD: releng/6.2/sys/sys/syslimits.h 164286 2006-11-14 20:42:41Z cvs2svn $
31 */
32
33 #ifndef _SYS_SYSLIMITS_H_
34 #define _SYS_SYSLIMITS_H_
35
36 #if !defined(_KERNEL) && !defined(_LIMITS_H_) && !defined(_SYS_PARAM_H_)
37 #ifndef _SYS_CDEFS_H_
38 #error this file needs sys/cdefs.h as a prerequisite
39 #endif
40 #ifdef __CC_SUPPORTS_WARNING
41 #warning "No user-serviceable parts inside."
42 #endif
43 #endif
44
45 /*
46 * Do not add any new variables here. (See the comment at the end of
47 * the file for why.)
48 */
49 #if defined(__arm__) || defined(__powerpc__)
50 #define ARG_MAX 65536 /* max bytes for an exec function */
51 #else
52 #define ARG_MAX 262144 /* max bytes for an exec function */
53 #endif
54 #ifndef CHILD_MAX
55 #define CHILD_MAX 40 /* max simultaneous processes */
56 #endif
57 #define LINK_MAX 32767 /* max file link count */
58 #define MAX_CANON 255 /* max bytes in term canon input line */
59 #define MAX_INPUT 255 /* max bytes in terminal input */
60 #define NAME_MAX 255 /* max bytes in a file name */
61 #define NGROUPS_MAX 16 /* max supplemental group id's */
62 #ifndef OPEN_MAX
63 #define OPEN_MAX 64 /* max open files per process */
64 #endif
65 #define PATH_MAX 1024 /* max bytes in pathname */
66 #define PIPE_BUF 512 /* max bytes for atomic pipe writes */
67 #define IOV_MAX 1024 /* max elements in i/o vector */
68
69 /*
70 * We leave the following values undefined to force applications to either
71 * assume conservative values or call sysconf() to get the current value.
72 *
73 * HOST_NAME_MAX
74 *
75 * (We should do this for most of the values currently defined here,
76 * but many programs are not prepared to deal with this yet.)
77 */
78 #endif
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