| t2ex/bsd_source/lib/libc/src_bsd/include/sys/param.h | bare source | permlink (0.02 seconds) |
1: /* $OpenBSD: param.h,v 1.94 2012/01/11 22:11:34 deraadt Exp $ */ 2: /* $NetBSD: param.h,v 1.23 1996/03/17 01:02:29 thorpej Exp $ */ 3: 4: /*- 5: * Copyright (c) 1982, 1986, 1989, 1993 6: * The Regents of the University of California. 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.h 8.2 (Berkeley) 1/21/94 38: */ 39: 40: #define BSD 199306 /* System version (year & month). */ 41: #define BSD4_3 1 42: #define BSD4_4 1 43: 44: #define OpenBSD 201205 /* OpenBSD version (year & month). */ 45: #define OpenBSD5_1 1 /* OpenBSD 5.1 */ 46: 47: #ifndef NULL 48: #ifdef __GNUG__ 49: #define NULL __null 50: #else 51: #define NULL ((void *)0) 52: #endif 53: #endif 54: 55: #ifndef _LOCORE 56: #include <sys/types.h> 57: #endif 58: 59: /* 60: * Machine-independent constants (some used in following include files). 61: * Redefined constants are from POSIX 1003.1 limits file. 62: * 63: * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 64: * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>) 65: */ 66: #include <sys/syslimits.h> 67: 68: #define MAXCOMLEN 16 /* max command name remembered */ 69: #define MAXINTERP 128 /* max interpreter file name length */ 70: #define MAXLOGNAME LOGIN_NAME_MAX /* max login name length w/ NUL */ 71: #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 72: #define NCARGS ARG_MAX /* max bytes for an exec function */ 73: #define NGROUPS NGROUPS_MAX /* max number groups */ 74: #define NOFILE OPEN_MAX /* max open files per process (soft) */ 75: #define NOFILE_MAX 1024 /* max open files per process (hard) */ 76: #define NOGROUP 65535 /* marker for empty group set member */ 77: #define MAXHOSTNAMELEN 256 /* max hostname size */ 78: 79: /* More types and definitions used throughout the kernel. */ 80: #ifdef _KERNEL 81: #include <sys/cdefs.h> 82: #include <sys/errno.h> 83: #include <sys/time.h> 84: #include <sys/resource.h> 85: #include <sys/ucred.h> 86: #include <sys/uio.h> 87: #endif 88: 89: /* Signals. */ 90: #include <sys/signal.h> 91: 92: /* Machine type dependent parameters. */ 93: #include <sys/limits.h> 94: #include <machine/param.h> 95: 96: /* 97: * Priorities. Note that with 32 run queues, differences less than 4 are 98: * insignificant. 99: */ 100: #define PSWP 0 101: #define PVM 4 102: #define PINOD 8 103: #define PRIBIO 16 104: #define PVFS 20 105: #define PZERO 22 /* No longer magic, shouldn't be here. XXX */ 106: #define PSOCK 24 107: #define PWAIT 32 108: #define PLOCK 36 109: #define PPAUSE 40 110: #define PUSER 50 111: #define MAXPRI 127 /* Priorities range from 0 through MAXPRI. */ 112: 113: #define PRIMASK 0x0ff 114: #define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */ 115: #define PNORELOCK 0x200 /* OR'd with pri for msleep to not reaquire 116: the mutex */ 117: 118: #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 119: #define NODEV (dev_t)(-1) /* non-existent device */ 120: #define NETDEV (dev_t)(-2) /* network device (for nfs swap) */ 121: 122: #define CBLOCK 64 /* Clist block size, must be a power of 2. */ 123: #define CBQSIZE (CBLOCK/NBBY) /* Quote bytes/cblock - can do better. */ 124: /* Data chars/clist. */ 125: #define CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE) 126: #define CROUND (CBLOCK - 1) /* Clist rounding. */ 127: 128: /* 129: * Constants related to network buffer management. 130: * MCLBYTES must be no larger than NBPG (the software page size), and, 131: * on machines that exchange pages of input or output buffers with mbuf 132: * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 133: * of the hardware page size. 134: */ 135: #define MSIZE 256 /* size of an mbuf */ 136: #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 137: /* 2K cluster can hold Ether frame */ 138: #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 139: #define MCLOFSET (MCLBYTES - 1) 140: 141: #define MAXMCLBYTES (64 * 1024) /* largest cluster from the stack */ 142: 143: /* 144: * File system parameters and macros. 145: * 146: * The file system is made out of blocks of at most MAXBSIZE units, with 147: * smaller units (fragments) only in the last direct block. MAXBSIZE 148: * primarily determines the size of buffers in the buffer pool. It may be 149: * made larger without any effect on existing file systems; however making 150: * it smaller makes some file systems unmountable. 151: */ 152: #ifndef MAXBSIZE /* XXX temp until sun3 DMA chaining */ 153: #define MAXBSIZE MAXPHYS 154: #endif 155: #define MAXFRAG 8 156: 157: /* 158: * MAXPATHLEN defines the longest permissible path length after expanding 159: * symbolic links. It is used to allocate a temporary buffer from the buffer 160: * pool in which to do the name expansion, hence should be a power of two, 161: * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 162: * maximum number of symbolic links that may be expanded in a path name. 163: * It should be set high enough to allow all legitimate uses, but halt 164: * infinite loops reasonably quickly. 165: */ 166: #define MAXPATHLEN PATH_MAX 167: #define MAXSYMLINKS SYMLOOP_MAX 168: 169: /* Macros to set/clear/test flags. */ 170: #ifdef _KERNEL 171: #define SET(t, f) ((t) |= (f)) 172: #define CLR(t, f) ((t) &= ~(f)) 173: #define ISSET(t, f) ((t) & (f)) 174: #endif 175: 176: /* Bit map related macros. */ 177: #define setbit(a,i) ((a)[(i)>>3] |= 1<<((i)&(NBBY-1))) 178: #define clrbit(a,i) ((a)[(i)>>3] &= ~(1<<((i)&(NBBY-1)))) 179: #define isset(a,i) ((a)[(i)>>3] & (1<<((i)&(NBBY-1)))) 180: #define isclr(a,i) (((a)[(i)>>3] & (1<<((i)&(NBBY-1)))) == 0) 181: 182: /* Macros for counting and rounding. */ 183: #ifndef howmany 184: #define howmany(x, y) (((x)+((y)-1))/(y)) 185: #endif 186: #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) 187: #define powerof2(x) ((((x)-1)&(x))==0) 188: 189: /* Macros for min/max. */ 190: #define MIN(a,b) (((a)<(b))?(a):(b)) 191: #define MAX(a,b) (((a)>(b))?(a):(b)) 192: 193: /* Macros for calculating the offset of a field */ 194: #if !defined(offsetof) && defined(_KERNEL) 195: #define offsetof(s, e) ((size_t)&((s *)0)->e) 196: #endif 197: 198: #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0])) 199: 200: /* 201: * Constants for setting the parameters of the kernel memory allocator. 202: * 203: * 2 ** MINBUCKET is the smallest unit of memory that will be 204: * allocated. It must be at least large enough to hold a pointer. 205: * 206: * Units of memory less or equal to MAXALLOCSAVE will permanently 207: * allocate physical memory; requests for these size pieces of 208: * memory are quite fast. Allocations greater than MAXALLOCSAVE must 209: * always allocate and free physical memory; requests for these 210: * size allocations should be done infrequently as they will be slow. 211: * 212: * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and 213: * MAXALLOCSIZE must be a power of two. 214: */ 215: #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 216: #define MAXALLOCSAVE (2 * PAGE_SIZE) 217: 218: /* 219: * Scale factor for scaled integers used to count %cpu time and load avgs. 220: * 221: * The number of CPU `tick's that map to a unique `%age' can be expressed 222: * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 223: * can be calculated (assuming 32 bits) can be closely approximated using 224: * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 225: * 226: * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 227: * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 228: */ 229: #define FSHIFT 11 /* bits to right of fixed binary point */ 230: #define FSCALE (1<<FSHIFT) 231: 232: /* 233: * The time for a process to be blocked before being very swappable. 234: * This is a number of seconds which the system takes as being a non-trivial 235: * amount of real time. You probably shouldn't change this; 236: * it is used in subtle ways (fractions and multiples of it are, that is, like 237: * half of a ``long time'', almost a long time, etc.) 238: * It is related to human patience and other factors which don't really 239: * change over time. 240: */ 241: #define MAXSLP 20 242: 243: /* 244: * rfork() options. 245: * 246: * XXX currently, operations without RFPROC set are not supported. 247: */ 248: #define RFNAMEG (1<<0) /* UNIMPL new plan9 `name space' */ 249: #define RFENVG (1<<1) /* UNIMPL copy plan9 `env space' */ 250: #define RFFDG (1<<2) /* copy fd table */ 251: #define RFNOTEG (1<<3) /* UNIMPL create new plan9 `note group' */ 252: #define RFPROC (1<<4) /* change child (else changes curproc) */ 253: #define RFMEM (1<<5) /* share `address space' */ 254: #define RFNOWAIT (1<<6) /* parent need not wait() on child */ 255: #define RFCNAMEG (1<<10) /* UNIMPL zero plan9 `name space' */ 256: #define RFCENVG (1<<11) /* UNIMPL zero plan9 `env space' */ 257: #define RFCFDG (1<<12) /* zero fd table */ 258: #define RFTHREAD (1<<13) /* create a thread, not a process */