110 lines
3.7 KiB
C
110 lines
3.7 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _KERN_LIMITS_H_
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#define _KERN_LIMITS_H_
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/*
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* Constants for libc's <limits.h> - system limits.
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*
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* The symbols are prefixed with __ here to avoid namespace pollution
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* in libc. Use <limits.h> (in either userspace or the kernel) to get
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* the proper names.
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*
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* These are Unix-style limits that Unix defines; you can change them
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* around or add others as needed or as are appropriate to your system
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* design.
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*
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* Likewise, the default values provided here are fairly reasonable,
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* but you can change them around pretty freely and userspace code
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* should adapt. Do change these as needed to match your
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* implementation.
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*/
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/*
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* Important, both as part of the system call API and for system behavior.
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*
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* 255 for NAME_MAX and 1024 for PATH_MAX are conventional. ARG_MAX
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* should be at least 16K. In real systems it often runs to 256K or
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* more.
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*/
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/* Longest filename (without directory) not including null terminator */
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#define __NAME_MAX 255
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/* Longest full path name */
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#define __PATH_MAX 1024
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/* Max bytes for an exec function (should be at least 16K) */
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#define __ARG_MAX (64 * 1024)
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/*
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* Important for system behavior, but not a big part of the API.
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*
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* Most modern systems don't have OPEN_MAX at all, and instead go by
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* whatever limit is set with setrlimit().
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*/
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/* Min value for a process ID (that can be assigned to a user process) */
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#define __PID_MIN 2
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/* Max value for a process ID (change this to match your implementation) */
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#define __PID_MAX 32767
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/* Max open files per process */
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#define __OPEN_MAX 128
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/* Max bytes for atomic pipe I/O -- see description in the pipe() man page */
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#define __PIPE_BUF 512
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/*
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* Not so important parts of the API. (Especially in OS/161 where we
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* don't do credentials by default.)
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*/
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/* Max number of supplemental group IDs in process credentials */
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#define __NGROUPS_MAX 32
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/* Max login name size (for setlogin/getlogin), incl. null */
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#define __LOGIN_NAME_MAX 17
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/*
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* Not very important at all.
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*/
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/* Max number of iovec structures at once for readv/writev/preadv/pwritev */
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#define __IOV_MAX 1024
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#endif /* _KERN_LIMITS_H_ */
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