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 /*      $OpenBSD: syslimits.h,v 1.15 2022/02/22 16:58:08 deraadt Exp $  */
    2 /*      $NetBSD: syslimits.h,v 1.12 1995/10/05 05:26:19 thorpej Exp $   */
    3 
    4 /*
    5  * Copyright (c) 1988, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)syslimits.h 8.1 (Berkeley) 6/2/93
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 
   37 #if __POSIX_VISIBLE || __XPG_VISIBLE || __BSD_VISIBLE
   38 #define ARG_MAX          (512 * 1024)   /* max bytes for an exec function */
   39 #define CHILD_MAX                  80   /* max simultaneous processes */
   40 #define LINK_MAX                32767   /* max file link count */
   41 #define MAX_CANON                 255   /* max bytes in term canon input line */
   42 #define MAX_INPUT                 255   /* max bytes in terminal input */
   43 #define NAME_MAX                  255   /* max bytes in a file name */
   44 #define NGROUPS_MAX                16   /* max supplemental group id's */
   45 #define OPEN_MAX                   64   /* max open files per process */
   46 #define PATH_MAX                 1024   /* max bytes in pathname */
   47 #define PIPE_BUF                  512   /* max bytes for atomic pipe writes */
   48 #define SYMLINK_MAX          PATH_MAX   /* max bytes in a symbolic link */
   49 #define SYMLOOP_MAX                32   /* max symlinks per path (for loops) */
   50 
   51 #define BC_BASE_MAX           INT_MAX   /* max ibase/obase values in bc(1) */
   52 #define BC_DIM_MAX              65535   /* max array elements in bc(1) */
   53 #define BC_SCALE_MAX          INT_MAX   /* max scale value in bc(1) */
   54 #define BC_STRING_MAX         INT_MAX   /* max const string length in bc(1) */
   55 #define COLL_WEIGHTS_MAX            2   /* max weights for order keyword */
   56 #define EXPR_NEST_MAX              32   /* max expressions nested in expr(1) */
   57 #define LINE_MAX                 2048   /* max bytes in an input line */
   58 #ifndef RE_DUP_MAX
   59 #define RE_DUP_MAX                255   /* max RE's in interval notation */
   60 #define SEM_VALUE_MAX        UINT_MAX   /* max value of a sem_* semaphore */
   61 #endif
   62 
   63 #if __XPG_VISIBLE
   64 #define IOV_MAX                  1024   /* max # of iov's (readv,sendmsg,etc) */
   65 #define NZERO                      20   /* default "nice" */
   66 #endif /* __XPG_VISIBLE */
   67 
   68 #endif /* __POSIX_VISIBLE || __XPG_VISIBLE || __BSD_VISIBLE */
   69 
   70 #if __XPG_VISIBLE >= 500 || __POSIX_VISIBLE >= 199506 || __BSD_VISIBLE
   71 #define TTY_NAME_MAX            260     /* max tty device name length w/ NUL */
   72 #define LOGIN_NAME_MAX          32      /* max login name length w/ NUL */
   73 #endif /* __XPG_VISIBLE >= 500 || __POSIX_VISIBLE >= 199506 || __BSD_VISIBLE */
   74 
   75 #if __POSIX_VISIBLE >= 200112
   76 #define HOST_NAME_MAX           255     /* max hostname length w/o NUL */
   77 #endif
   78 
   79 #define _MAXCOMLEN              24      /* includes NUL */

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