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  * 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/6.3/sys/sys/syslimits.h 173886 2007-11-24 19:45:58Z 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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