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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1988, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)syslimits.h 8.1 (Berkeley) 6/2/93
     * $FreeBSD: releng/12.0/sys/sys/syslimits.h 327598 2018-01-05 22:26:23Z jhb $
     */
    
    #ifndef _SYS_SYSLIMITS_H_
    #define _SYS_SYSLIMITS_H_
    
    #if !defined(_STANDALONE) && !defined(_KERNEL) && !defined(_LIMITS_H_) && !defined(_SYS_PARAM_H_)
    #ifndef _SYS_CDEFS_H_
    #error this file needs sys/cdefs.h as a prerequisite
    #endif
    #ifdef __CC_SUPPORTS_WARNING
    #warning "No user-serviceable parts inside."
    #endif
    #endif
    
    /*
     * Do not add any new variables here.  (See the comment at the end of
     * the file for why.)
     */
    #define ARG_MAX                 262144  /* max bytes for an exec function */
    #ifndef CHILD_MAX
    #define CHILD_MAX                  40   /* max simultaneous processes */
    #endif
    #define MAX_CANON                 255   /* max bytes in term canon input line */
    #define MAX_INPUT                 255   /* max bytes in terminal input */
    #define NAME_MAX                  255   /* max bytes in a file name */
    #ifndef NGROUPS_MAX
    #define NGROUPS_MAX              1023   /* max supplemental group id's */
    #endif
    #ifndef OPEN_MAX
    #define OPEN_MAX                   64   /* max open files per process */
    #endif
    #define PATH_MAX                 1024   /* max bytes in pathname */
    #define PIPE_BUF                  512   /* max bytes for atomic pipe writes */
    #define IOV_MAX                  1024   /* max elements in i/o vector */
    
    /*
     * We leave the following values undefined to force applications to either
     * assume conservative values or call sysconf() to get the current value.
     *
     * HOST_NAME_MAX
     *
     * (We should do this for most of the values currently defined here,
     * but many programs are not prepared to deal with this yet.)
     */
    #endif

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