The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/syslimits.h

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    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: releng/12.0/sys/sys/syslimits.h 327598 2018-01-05 22:26:23Z jhb $
   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 #define ARG_MAX                 262144  /* max bytes for an exec function */
   52 #ifndef CHILD_MAX
   53 #define CHILD_MAX                  40   /* max simultaneous processes */
   54 #endif
   55 #define MAX_CANON                 255   /* max bytes in term canon input line */
   56 #define MAX_INPUT                 255   /* max bytes in terminal input */
   57 #define NAME_MAX                  255   /* max bytes in a file name */
   58 #ifndef NGROUPS_MAX
   59 #define NGROUPS_MAX              1023   /* max supplemental group id's */
   60 #endif
   61 #ifndef OPEN_MAX
   62 #define OPEN_MAX                   64   /* max open files per process */
   63 #endif
   64 #define PATH_MAX                 1024   /* max bytes in pathname */
   65 #define PIPE_BUF                  512   /* max bytes for atomic pipe writes */
   66 #define IOV_MAX                  1024   /* max elements in i/o vector */
   67 
   68 /*
   69  * We leave the following values undefined to force applications to either
   70  * assume conservative values or call sysconf() to get the current value.
   71  *
   72  * HOST_NAME_MAX
   73  *
   74  * (We should do this for most of the values currently defined here,
   75  * but many programs are not prepared to deal with this yet.)
   76  */
   77 #endif

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