BSD 4_3_Net_2 release

[unix-history] / usr / src / sys / sys / param.h

diff --git a/usr/src/sys/sys/param.h b/usr/src/sys/sys/param.h
index 3f6e531..3f43367 100644 (file)
--- a/usr/src/sys/sys/param.h
+++ b/usr/src/sys/sys/param.h
@@ -1,91 +1,118 @@
-/*
- * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+/*-
+ * Copyright (c) 1982, 1986, 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. 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.

  *
  *

- *     @(#)param.h     7.17 (Berkeley) 6/28/90
+ * 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.h     7.23 (Berkeley) 5/6/91

  */
 
  */
 

-#define        BSD     199006          /* June, 1990 system version (year & month) */
+#define        BSD     199103          /* March, 1991 system version (year & month) */

 #define BSD4_3 1
 #define BSD4_4 0.5
 
 #define BSD4_3 1
 #define BSD4_4 0.5
 

-#include <sys/syslimits.h>
+#ifndef NULL
+#define        NULL    0
+#endif
+
+#ifndef LOCORE
+#include <sys/types.h>
+#endif

 
 /*
 
 /*

- * Machine-independent constants
+ * Machine-independent constants (some used in following include files).
+ * Redefined constants are from POSIX 1003.1 limits file.
+ *
+ * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
+ * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>)

  */
  */

-#define        MAXUPRC         CHILD_MAX       /* max processes per user */
-#define        NOFILE          OPEN_MAX        /* max open files per process */
-#define        NCARGS          ARG_MAX         /* # characters in exec arglist */
+#include <sys/syslimits.h>
+
+#define        MAXCOMLEN       16              /* max command name remembered */

 #define        MAXINTERP       32              /* max interpreter file name length */
 #define        MAXINTERP       32              /* max interpreter file name length */

+#define        MAXLOGNAME      12              /* max login name length */
+#define        MAXUPRC         CHILD_MAX       /* max simultaneous processes */
+#define        NCARGS          ARG_MAX         /* max bytes for an exec function */

 #define        NGROUPS         NGROUPS_MAX     /* max number groups */
 #define        NGROUPS         NGROUPS_MAX     /* max number groups */

-#define MAXHOSTNAMELEN 256             /* maximum hostname size */
-#define        MAXCOMLEN       16              /* maximum command name remembered */
-       /* MAXCOMLEN should be >= sizeof(ac_comm) (acct.h)  */
-#define        MAXLOGNAME      12              /* maximum login name length */
-       /* MAXLOGNAME must be >= UT_NAMESIZE (<utmp.h>) */
-
+#define        NOFILE          OPEN_MAX        /* max open files per process */

 #define        NOGROUP         65535           /* marker for empty group set member */
 #define        NOGROUP         65535           /* marker for empty group set member */

+#define MAXHOSTNAMELEN 256             /* max hostname size */
+
+/* More types and definitions used throughout the kernel. */
+#ifdef KERNEL
+#include <sys/cdefs.h>
+#include <sys/errno.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/ucred.h>
+#include <sys/uio.h>
+#endif
+
+/* Signals. */
+#include <sys/signal.h>
+
+/* Machine type dependent parameters. */
+#include <machine/param.h>
+#include <machine/endian.h>
+#include <machine/limits.h>

 
 /*
 
 /*

- * Priorities
+ * Priorities.  Note that with 32 run queues, differences less than 4 are
+ * insignificant.

  */
 #define        PSWP    0
  */
 #define        PSWP    0

-#define        PINOD   10
-#define        PRIBIO  20
-#define        PVFS    22
-#define        PZERO   25
-#define        PSOCK   26
-#define        PWAIT   30
-#define        PLOCK   35
+#define        PVM     4
+#define        PINOD   8
+#define        PRIBIO  16
+#define        PVFS    20
+#define        PZERO   22              /* No longer magic, shouldn't be here.  XXX */
+#define        PSOCK   24
+#define        PWAIT   32
+#define        PLOCK   36

 #define        PPAUSE  40
 #define        PUSER   50
 #define        PPAUSE  40
 #define        PUSER   50

-#define        PRIMASK 0x0ff
-#define        PCATCH  0x100           /* or'd with pri for tsleep to check signals */
-
-#define        NZERO   0
-
-#ifndef KERNEL
-#include       <sys/types.h>
-#else
-#ifndef LOCORE
-#include       "types.h"
-#endif
-#endif
+#define        MAXPRI  127             /* Priorities range from 0 through MAXPRI. */

 
 

-/*
- * Signals
- */
-#ifdef KERNEL
-#include "signal.h"
-#else
-#include <sys/signal.h>
-#endif
+#define        PRIMASK 0x0ff
+#define        PCATCH  0x100           /* OR'd with pri for tsleep to check signals */

 
 

-/*
- * Machine type dependent parameters.
- */
-#ifdef KERNEL
-#include "machine/machparam.h"
-#else
-#include <machine/machparam.h>
-#endif
+#define        NZERO   0               /* default "nice" */

 
 

-#define        NBPW    sizeof(int)     /* number of bytes in an integer */
+#define        NBPW    sizeof(int)     /* number of bytes per word (integer) */

 
 

-#ifndef NULL
-#define        NULL    0
-#endif
-#define        CMASK   022             /* default mask for file creation */
-#define        NODEV   (dev_t)(-1)
+#define        CMASK   022             /* default file mask: S_IWGRP|S_IWOTH */
+#define        NODEV   (dev_t)(-1)     /* non-existent device */

 
 /*
  * Clustering of hardware pages on machines with ridiculously small
  * page sizes is done here.  The paging subsystem deals with units of
  * CLSIZE pte's describing NBPG (from machine/machparam.h) pages each.
 
 /*
  * Clustering of hardware pages on machines with ridiculously small
  * page sizes is done here.  The paging subsystem deals with units of
  * CLSIZE pte's describing NBPG (from machine/machparam.h) pages each.

- *
- * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE

  */
 #define        CLBYTES         (CLSIZE*NBPG)
 #define        CLOFSET         (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */
  */
 #define        CLBYTES         (CLSIZE*NBPG)
 #define        CLOFSET         (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */


@@ -97,66 +124,56 @@
 #define        clbase(i)       (i)
 #define        clrnd(i)        (i)
 #else
 #define        clbase(i)       (i)
 #define        clrnd(i)        (i)
 #else

-/* give the base virtual address (first of CLSIZE) */
+/* Give the base virtual address (first of CLSIZE). */

 #define        clbase(i)       ((i) &~ (CLSIZE-1))
 #define        clbase(i)       ((i) &~ (CLSIZE-1))

-/* round a number of clicks up to a whole cluster */
+/* Round a number of clicks up to a whole cluster. */

 #define        clrnd(i)        (((i) + (CLSIZE-1)) &~ (CLSIZE-1))
 #endif
 
 #define        clrnd(i)        (((i) + (CLSIZE-1)) &~ (CLSIZE-1))
 #endif
 

-/* CBLOCK is the size of a clist block, must be power of 2 */
-#define        CBLOCK  64
-#define CBQSIZE        (CBLOCK/NBBY)   /* quote bytes/cblock - can do better */
-#define        CBSIZE  (CBLOCK - sizeof(struct cblock *) - CBQSIZE) /* data chars/clist */
-#define        CROUND  (CBLOCK - 1)                            /* clist rounding */
+#define        CBLOCK  64              /* Clist block size, must be a power of 2. */
+#define CBQSIZE        (CBLOCK/NBBY)   /* Quote bytes/cblock - can do better. */
+                               /* Data chars/clist. */
+#define        CBSIZE  (CBLOCK - sizeof(struct cblock *) - CBQSIZE)
+#define        CROUND  (CBLOCK - 1)    /* Clist rounding. */

 
 /*
  * File system parameters and macros.
  *
 
 /*
  * File system parameters and macros.
  *

- * The file system is made out of blocks of at most MAXBSIZE units,
- * with smaller units (fragments) only in the last direct block.
- * MAXBSIZE primarily determines the size of buffers in the buffer
- * pool. It may be made larger without any effect on existing
- * file systems; however making it smaller make make some file
- * systems unmountable.
+ * The file system is made out of blocks of at most MAXBSIZE units, with
+ * smaller units (fragments) only in the last direct block.  MAXBSIZE
+ * primarily determines the size of buffers in the buffer pool.  It may be
+ * made larger without any effect on existing file systems; however making
+ * it smaller make make some file systems unmountable.

  */
 #define        MAXBSIZE        8192
 #define MAXFRAG        8
 
 /*
  */
 #define        MAXBSIZE        8192
 #define MAXFRAG        8
 
 /*

- * MAXPATHLEN defines the longest permissable path length
- * after expanding symbolic links. It is used to allocate
- * a temporary buffer from the buffer pool in which to do the
- * name expansion, hence should be a power of two, and must
- * be less than or equal to MAXBSIZE.
- * MAXSYMLINKS defines the maximum number of symbolic links
- * that may be expanded in a path name. It should be set high
- * enough to allow all legitimate uses, but halt infinite loops
- * reasonably quickly.
+ * MAXPATHLEN defines the longest permissable path length after expanding
+ * symbolic links. It is used to allocate a temporary buffer from the buffer
+ * pool in which to do the name expansion, hence should be a power of two,
+ * and must be less than or equal to MAXBSIZE.  MAXSYMLINKS defines the
+ * maximum number of symbolic links that may be expanded in a path name.
+ * It should be set high enough to allow all legitimate uses, but halt
+ * infinite loops reasonably quickly.

  */
 #define        MAXPATHLEN      PATH_MAX
 #define MAXSYMLINKS    8
 
  */
 #define        MAXPATHLEN      PATH_MAX
 #define MAXSYMLINKS    8
 

-/*
- * bit map related macros
- */
+/* Bit map related macros. */

 #define        setbit(a,i)     ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
 #define        clrbit(a,i)     ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
 #define        isset(a,i)      ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
 #define        isclr(a,i)      (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
 
 #define        setbit(a,i)     ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
 #define        clrbit(a,i)     ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
 #define        isset(a,i)      ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
 #define        isclr(a,i)      (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
 

-/*
- * Macros for counting and rounding.
- */
+/* Macros for counting and rounding. */

 #ifndef howmany
 #define        howmany(x, y)   (((x)+((y)-1))/(y))
 #endif
 #define        roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
 #define powerof2(x)    ((((x)-1)&(x))==0)
 
 #ifndef howmany
 #define        howmany(x, y)   (((x)+((y)-1))/(y))
 #endif
 #define        roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
 #define powerof2(x)    ((((x)-1)&(x))==0)
 

-/*
- * Macros for fast min/max:
- * with inline expansion, the "function" is faster.
- */
+/* Macros for fast min/max: with inline expansion, the "function" is faster. */

 #ifdef KERNEL
 #define        MIN(a,b) min((a), (b))
 #define        MAX(a,b) max((a), (b))
 #ifdef KERNEL
 #define        MIN(a,b) min((a), (b))
 #define        MAX(a,b) max((a), (b))


@@ -176,8 +193,9 @@
  * memory are quite fast. Allocations greater than MAXALLOCSAVE must
  * always allocate and free physical memory; requests for these
  * size allocations should be done infrequently as they will be slow.
  * memory are quite fast. Allocations greater than MAXALLOCSAVE must
  * always allocate and free physical memory; requests for these
  * size allocations should be done infrequently as they will be slow.

- * Constraints: CLBYTES <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14)
- * and MAXALLOCSIZE must be a power of two.
+ *
+ * Constraints: CLBYTES <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
+ * MAXALLOCSIZE must be a power of two.

  */
 #define MINBUCKET      4               /* 4 => min allocation of 16 bytes */
 #define MAXALLOCSAVE   (2 * CLBYTES)
  */
 #define MINBUCKET      4               /* 4 => min allocation of 16 bytes */
 #define MAXALLOCSAVE   (2 * CLBYTES)