SCCS-vsn: sys/sys/param.h 7.22
-/*
- * 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.
+ *
+ * %sccs.include.redist.c%
- * @(#)param.h 7.21 (Berkeley) %G%
+ * @(#)param.h 7.22 (Berkeley) %G%
*/
#define BSD 199103 /* March, 1991 system version (year & month) */
#define BSD4_3 1
#define BSD4_4 0.5
*/
#define BSD 199103 /* March, 1991 system version (year & month) */
#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
/*
#ifndef LOCORE
#include <sys/types.h>
#endif
/*
- * Machine-independent constants (some used in following include files)
+ * 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
- */
+/* More types and definitions used throughout the kernel. */
#ifdef KERNEL
#include <sys/cdefs.h>
#include <sys/errno.h>
#ifdef KERNEL
#include <sys/cdefs.h>
#include <sys/errno.h>
#include <sys/uio.h>
#endif
#include <sys/uio.h>
#endif
-/*
- * Machine type dependent parameters.
- */
+/* Machine type dependent parameters. */
#include <machine/param.h>
#include <machine/endian.h>
#include <machine/limits.h>
/*
#include <machine/param.h>
#include <machine/endian.h>
#include <machine/limits.h>
/*
- * Priorities. Note that with 32 run queues,
- * differences less than 4 are insignificant.
+ * Priorities. Note that with 32 run queues, differences less than 4 are
+ * insignificant.
*/
#define PSWP 0
#define PVM 4
*/
#define PSWP 0
#define PVM 4
#define PRIBIO 16
#define PVFS 20
#define PSOCK 24
#define PRIBIO 16
#define PVFS 20
#define PSOCK 24
-#define PZERO 25 /* No longer magic, shouldn't be here XXX */
+#define PZERO 25 /* No longer magic, shouldn't be here. XXX */
#define PWAIT 32
#define PLOCK 36
#define PPAUSE 40
#define PUSER 50
#define PWAIT 32
#define PLOCK 36
#define PPAUSE 40
#define PUSER 50
-#define MAXPRI 127 /* priorities range from 0 through MAXPRI */
+#define MAXPRI 127 /* Priorities range from 0 through MAXPRI. */
-#define PCATCH 0x100 /* or'd with pri for tsleep to check signals */
+#define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */
#define NZERO 0 /* default "nice" */
#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 */
#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))
* 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)
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