IABSD.fr/src/sys/conf/param.c

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• Author : mvs
  Date : 2024-08-20 13:29:25
  Hash : 1b92846d
  Message : Unlock KERN_MAXFILES. `maxfiles' is atomically accessed integer which is lockless and read-only accessed in file descriptors layer. lim_startup() called during kernel bootstrap, no need to atomic_load_int() within. ok mpi

• sys/conf/param.c

• /*	$OpenBSD: param.c,v 1.52 2024/08/20 13:29:25 mvs Exp $	*/
  /*	$NetBSD: param.c,v 1.16 1996/03/12 03:08:40 mrg Exp $	*/
  
  /*
   * Copyright (c) 1980, 1986, 1989 Regents of the University of California.
   * All rights reserved.
   * (c) UNIX System Laboratories, Inc.
   * All or some portions of this file are derived from material licensed
   * to the University of California by American Telephone and Telegraph
   * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   * the permission of UNIX System Laboratories, Inc.
   *
   * 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.
   *
   *	@(#)param.c	7.20 (Berkeley) 6/27/91
   */
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/kernel.h>
  #include <sys/utsname.h>
  #ifdef SYSVSHM
  #include <machine/vmparam.h>
  #include <sys/shm.h>
  #endif
  #ifdef SYSVSEM
  #include <sys/sem.h>
  #endif
  
  /*
   * Locks used to protect data:
   *	a	atomic
   */
  
  /*
   * System parameter formulae.
   *
   * This file is copied into each directory where we compile
   * the kernel; it should be modified there to suit local taste
   * if necessary.
   *
   * Compiled with -DHZ=xx -DMAXUSERS=xx
   */
  
  int	hz = HZ;
  int	tick = 1000000 / HZ;
  int	tick_nsec = 1000000000 / HZ;
  int	utc_offset = 0;
  #define	NPROCESS (30 + 16 * MAXUSERS)
  #define	NTEXT (80 + NPROCESS / 8)		/* actually the object cache */
  #define	NVNODE (NPROCESS * 2 + NTEXT + 100)
  int	initialvnodes = NVNODE;
  int	maxprocess = NPROCESS;				/* [a] */
  int	maxthread = 2 * NPROCESS;			/* [a] */
  int	maxfiles = 5 * (NPROCESS + MAXUSERS) + 80;	/* [a] */
  long	nmbclust = NMBCLUSTERS;
  
  #ifndef BUFCACHEPERCENT
  #define BUFCACHEPERCENT	20
  #endif
  int     bufcachepercent = BUFCACHEPERCENT;
  
  #ifndef  BUFPAGES
  #define BUFPAGES	0
  #endif
  long     bufpages = BUFPAGES;
  
  int	fscale = FSCALE;	/* kernel uses `FSCALE', user uses `fscale' */
  
  /*
   * Values in support of System V compatible shared memory.	XXX
   */
  #ifdef SYSVSHM
  #define	SHMMAX	SHMMAXPGS	/* shminit() performs a `*= PAGE_SIZE' */
  #define	SHMMIN	1
  #define	SHMMNI	128		/* <64k, see IPCID_TO_IX in ipc.h */
  #define	SHMSEG	128
  #define	SHMALL	(SHMMAXPGS)
  
  struct	shminfo shminfo = {
  	SHMMAX,
  	SHMMIN,
  	SHMMNI,
  	SHMSEG,
  	SHMALL
  };
  #endif
  
  /*
   * Values in support of System V compatible semaphores.
   */
  #ifdef SYSVSEM
  struct	seminfo seminfo = {
  	SEMMNI,		/* # of semaphore identifiers */
  	SEMMNS,		/* # of semaphores in system */
  	SEMMNU,		/* # of undo structures in system */
  	SEMMSL,		/* max # of semaphores per id */
  	SEMOPM,		/* max # of operations per semop call */
  	SEMUME,		/* max # of undo entries per process */
  	SEMUSZ,		/* size in bytes of undo structure */
  	SEMVMX,		/* semaphore maximum value */
  	SEMAEM		/* adjust on exit max value */
  };
  #endif
  
  /*
   * This has to be allocated somewhere; allocating
   * them here forces loader errors if this file is omitted
   * (if they've been externed everywhere else; hah!).
   */
  struct	utsname utsname;