1 /* $OpenBSD: param.c,v 1.26 2007/05/26 20:26:51 pedro Exp $ */ 2 /* $NetBSD: param.c,v 1.16 1996/03/12 03:08:40 mrg Exp $ */ 3 4 /* 5 * Copyright (c) 1980, 1986, 1989 Regents of the University of California. 6 * All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)param.c 7.20 (Berkeley) 6/27/91 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/socket.h> 43 #include <sys/proc.h> 44 #include <sys/vnode.h> 45 #include <sys/file.h> 46 #include <sys/timeout.h> 47 #include <sys/mbuf.h> 48 #include <ufs/ufs/quota.h> 49 #include <sys/kernel.h> 50 #include <sys/utsname.h> 51 #ifdef SYSVSHM 52 #include <machine/vmparam.h> 53 #include <sys/shm.h> 54 #endif 55 #ifdef SYSVSEM 56 #include <sys/sem.h> 57 #endif 58 #ifdef SYSVMSG 59 #include <sys/msg.h> 60 #endif 61 62 /* 63 * System parameter formulae. 64 * 65 * This file is copied into each directory where we compile 66 * the kernel; it should be modified there to suit local taste 67 * if necessary. 68 * 69 * Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx 70 */ 71 72 #ifndef TIMEZONE 73 # define TIMEZONE 0 74 #endif 75 #ifndef DST 76 # define DST 0 77 #endif 78 #ifndef HZ 79 #define HZ 100 80 #endif 81 int hz = HZ; 82 int tick = 1000000 / HZ; 83 int tickadj = 240000 / (60 * HZ); /* can adjust 240ms in 60s */ 84 struct timezone tz = { TIMEZONE, DST }; 85 #define NPROC (20 + 16 * MAXUSERS) 86 int maxproc = NPROC; 87 int maxfiles = 3 * (NPROC + MAXUSERS) + 80; 88 int nmbclust = NMBCLUSTERS; 89 90 #ifndef MBLOWAT 91 #define MBLOWAT 16 92 #endif 93 int mblowat = MBLOWAT; 94 95 #ifndef MCLLOWAT 96 #define MCLLOWAT 8 97 #endif 98 int mcllowat = MCLLOWAT; 99 100 101 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 102 103 int shmseg = 8; 104 int shmmaxpgs = SHMMAXPGS; 105 /* 106 * Values in support of System V compatible shared memory. XXX 107 */ 108 #ifdef SYSVSHM 109 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */ 110 #define SHMMIN 1 111 #define SHMMNI 128 /* <64k, see IPCID_TO_IX in ipc.h */ 112 #define SHMSEG 128 113 #define SHMALL (SHMMAXPGS) 114 115 struct shminfo shminfo = { 116 SHMMAX, 117 SHMMIN, 118 SHMMNI, 119 SHMSEG, 120 SHMALL 121 }; 122 #endif 123 124 /* 125 * Values in support of System V compatible semaphores. 126 */ 127 #ifdef SYSVSEM 128 struct seminfo seminfo = { 129 SEMMNI, /* # of semaphore identifiers */ 130 SEMMNS, /* # of semaphores in system */ 131 SEMMNU, /* # of undo structures in system */ 132 SEMMSL, /* max # of semaphores per id */ 133 SEMOPM, /* max # of operations per semop call */ 134 SEMUME, /* max # of undo entries per process */ 135 SEMUSZ, /* size in bytes of undo structure */ 136 SEMVMX, /* semaphore maximum value */ 137 SEMAEM /* adjust on exit max value */ 138 }; 139 #endif 140 141 /* 142 * Values in support of System V compatible messages. 143 */ 144 #ifdef SYSVMSG 145 struct msginfo msginfo = { 146 MSGMAX, /* max chars in a message */ 147 MSGMNI, /* # of message queue identifiers */ 148 MSGMNB, /* max chars in a queue */ 149 MSGTQL, /* max messages in system */ 150 MSGSSZ, /* size of a message segment */ 151 /* (must be small power of 2 greater than 4) */ 152 MSGSEG /* number of message segments */ 153 }; 154 #endif 155 156 /* 157 * This has to be allocated somewhere; allocating 158 * them here forces loader errors if this file is omitted 159 * (if they've been externed everywhere else; hah!). 160 */ 161 struct utsname utsname; 162