<sys/time.h>: Add 3rd arg to timespecadd()/sub() and make them public.
[dragonfly.git] / sys / sys / param.h
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1/*-
2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
2c64e990 18 * 3. Neither the name of the University nor the names of its contributors
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19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)param.h 8.3 (Berkeley) 4/4/95
35 * $FreeBSD: src/sys/sys/param.h,v 1.61.2.38 2003/05/22 17:12:01 fjoe Exp $
36 */
37
38#ifndef _SYS_PARAM_H_
39#define _SYS_PARAM_H_
40
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41/*
42 * Historic BSD #defines -- probably will remain untouched for all time.
43 */
44#define BSD 199506 /* System version (year & month). */
45#define BSD4_3 1
46#define BSD4_4 1
984263bc 47
d77e8324 48/*
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49 * __DragonFly_version number. The number doesn't really meaningfully
50 * translate to a version number.
9ba76b73 51 *
02d4667d 52 * 170000 - base development version after 1.6 branch
aefcf6d5 53 * 170001 - base development version before 1.8 branch
677f984f 54 * 190000 - base development version after 1.8 branch
3ae3ada0 55 * 195000 - base development version after 1.10 branch
eab38af1 56 * 197500 - base development version before 1.12 branch
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57 * 197600 - 1.12 branch
58 * 197700 - base development version after 1.12 branch
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59 * 199900 - base development version before 2.0 branch
60 * 200000 - 2.0 branch
3b7b6af7 61 * 200100 - base development version after 2.0 branch
91fdc001 62 * 200101 - lchflags syscall
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63 * 200200 - 2.2 branch
64 * 200201 - base development version after 2.2 branch
64cc0b46 65 * 200202 - major changes to libc
b8f055be 66 * 200203 - introduce PCI domain
809dc6e6 67 * 200204 - suser() & suser_cred() removal
e12edcbc 68 * 200205 - devfs import
f464e11c 69 * 200206 - *sleep() renames
68dc98df 70 * 200400 - 2.4 release
7317bb64 71 * 200500 - 2.5 master
68dc98df 72 * 200600 - 2.6 release
40eb8ea1 73 * 200700 - 2.7 master
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74 * 200800 - 2.8 release October 2010
75 * 200900 - 2.9 master
55cc754d 76 * 200901 - prototype changes for alphasort(3) and scandir(3)
62b5ec1d 77 * 200902 - Xerox NS protocol removal
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78 * 201000 - 2.10 release
79 * 201100 - 2.11 master
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80 * 201200 - 2.12 release
81 * 201300 - 2.13 master
b993bb87 82 * 201301 - header rename: <vfs/gnu/ext2fs/...> -> <gnu/vfs/ext2fs/...>
e96bff60 83 * 201302 - header <crypt.h> is gone
d22a69a4 84 * 201303 - <netatalk/...> and <netproto/atalk/...> are gone
7c426b5f 85 * 201304 - Added wcscasecmp, wcsncasecmp to libc
373b1e4d 86 * 201305 - Sync libm with NetBSD-current libm (new functions added)
ae23f131 87 * 201306 - Sync libm with FreeBSD-current libm (~50 new functions)
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88 * 300000 - 3.0 release
89 * 300100 - 3.1 master
85b2e95a 90 * 300101 - i4b (ISDN) removal
d64e8ab7 91 * 300102 - <sys/ata.h> is now just a link of <sys/nata.h>
19af1870 92 * 300103 - if SIG_IGN is set on SIGCHLD, do not keep zombie children
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93 * 300200 - 3.2 release
94 * 300300 - 3.3 master
6eb83deb 95 * 300301 - Add eaccess syscall
32fe9e81 96 * 300302 - fpsave changes - ucontext_t, mcontext_t, sigcontext, sigframe
51dc126e 97 * 300303 - Demarcation of old m4/flex with new m4/flex
3f7f81b2 98 * 300304 - Update to dialog-1.2-20121230
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99 * 300400 - 3.4 release
100 * 300500 - 3.5 master
6ff43c94 101 * 300501 - Convert libm to FreeBSD's version
29646bb3 102 * 300502 - GEM and i915 KMS support in kernel
0d5acd74 103 * 300503 - Upgrade libiconv, locales, and associated libc functions
b0eeb746 104 * 300600 - 3.6 release
f0dce136 105 * 300700 - 3.7 master
b40efcac 106 * 300701 - Relocate bus/smbus/smb.h to dev/smbus/smb/smb.h
eecbc471 107 * 300702 - drm/i915 update
f0478b8b 108 * 300703 - Make usb4bsd default
6f25d555 109 * 300704 - Removal of IPX, NCP and NWFS support
7c87aae6 110 * 300705 - Removal of ATM support.
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111 * 300800 - 3.8 release
112 * 300900 - 3.9 master
c37490a2 113 * 300901 - drm/i915 hardware context support added
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114 * 400000 - 4.0 release
115 * 400100 - 4.1 development
60a260ad 116 * 400101 - Removal of SCTP support.
aa7c3d6b 117 * 400102 - Sound system update from FreeBSD
1382aea8 118 * 400103 - Milestone - availability of gcc50 in base
b44473af 119 * 400104 - struct lwp_params (a public struct) members renaming
4e8e707f 120 * 400105 - Switch to gcc50 as the primary compiler
ca1161c6 121 * 400106 - Added pipe2() system call
4249868f 122 * 400107 - Add futimens() and utimensat() syscalls
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123 * 400200 - 4.2 release
124 * 400300 - 4.3 development
0db70a6a 125 * 400301 - posix compliant iconv (no const qualifier)
9b14d589 126 * 400302 - Replacement of libm with OpenBSD's libm
856bdec9 127 * 400303 - environ and __progname are no longer linkable symbols
43a397d9 128 * 400304 - Activate symbol versioning for libc.so (still on version 8)
73610d44 129 * 400305 - Add accept4() system call
b0bad46d 130 * 400306 - Add libexecinfo to base
0e9fd563 131 * 400307 - drm/i915 kernel module renamed to i915.ko
02b66c54 132 * 400308 - <malloc.h> removal
0ca59c34 133 * 400309 - Add lwp_setname() system call
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134 * 400400 - 4.4 release
135 * 400500 - 4.5 development
a18a1725 136 * 400501 - unionfs removal
139f027d 137 * 400502 - private libraries: ssh ldns edit ncurses
f2c43266 138 * 400503 - libarchive-3.0.2 import (add bsdcat)
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139 * 400600 - 4.6 release
140 * 400700 - 4.7 development
33ed2f5d 141 * 400701 - getline() visibility changes
60e8fc88 142 * 400702 - private library: libressl
ffa81124 143 * 400703 - resolved conflicts of md, crypt and ressl libraries
93c47c45 144 * 400704 - binutils update to 2.27
8f95cc34 145 * 400705 - lwp_{set,get}affinity()
907281d1 146 * 400706 - sched_{set,get}affinity()
b2920380 147 * 400707 - pthread_{set,get}affinity_np()
1eb8c611 148 * 400708 - lwp_create2()
3ae362f2 149 * 400709 - pthread_attr_{set,get}affinity_np()
a7477187 150 * 400710 - sched_getcpu();
992850f4 151 * 400711 - move lwp syscalls to sys/lwp.h
f8e25fa7 152 * 400712 - restore lwp syscalls (except lwp_create*) declaration
4276b194 153 * 400713 - add sysctl kern.cp_times
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154 * 400800 - 4.8 release
155 * 400900 - 4.9 development
7a76de80 156 * 400901 - moved sigtramp, NX protection, sigtramp sysctl
10df642b 157 * 400902 - change CPU_SETSIZE to signed; allow proc to change self affinity
fc7075bb 158 * 400903 - malloc_type cleanup
12a7cdae 159 * 400904 - pad rtstatistics
7a76de80 160 * 400905 - PTHREAD_STACK_MIN increase: 1024 => 16384
526c5c2b 161 * 400906 - lwpid_t >=1, instead of >=0
c0f25c26 162 * 400907 - pthread_getthreadid_np()
725edadf 163 * 400908 - {clock,pthread}_getcpuclockid()
ac6b17f6 164 * 400909 - deleted ortentry, SIOC{ADD,DEL}RT, RTM_OLD{ADD,DEL}
43dbcc2a 165 * 400910 - routing table is only available on netisr_ncpus
2bf4b7d5 166 * 500000 - 5.0 release
b5e8ec10 167 * 500100 - 5.1 development
d9d67b59 168 * 500101 - kernel ppp removal
22b7a3db 169 * 500102 - <sys/sysref{,2}.h> inclusions removed from some public headers
06937ef9 170 * 500103 - faith removal
81c399c9 171 * 500104 - cfmakesane()
32f8d3b4 172 * 500105 - _SC_LEVEL1_DCACHE_LINESIZE sysconf()
a0d0bd1f 173 * 500106 - %b and %r formats removal
e4f76d8f 174 * 500107 - <machine/apm_bios.h> removal
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175 * 500200 - 5.2 release
176 * 500300 - 5.3 development
c309c6d4 177 * 500301 - rename some public UFS constants
32506cfa 178 * 500302 - move IOCTLTRIM to a better header and rename it to DAIOCTRIM
dc06fcca 179 * 500303 - get rid of sgtty (superseded by termios)
755d70b8 180 * 500304 - remove IPSEC/FAST_IPSEC
c4851e1d 181 * 500305 - remove <sys/ioctl_compat.h> for good
e6975a4e 182 * 500306 - strsuftoll(), strsuftollx()
37eb443d 183 * 500307 - tcsetsid()
f401eab7 184 * 500308 - xdr_uint16_t()
e7ab884b 185 * 500309 - drop support for some ancient ioctls (OSIOCGIF*)
6b5ed54a 186 * 500310 - remove more unimplemented ioctls
9dbd27e2 187 * 500311 - add VIS_ALL to vis(3)
0cdea21a 188 * 500312 - OpenPAM Resedacea upgrade
ad592396 189 * 500313 - remove vmnet support from tap(4) (VMIO_* ioctls)
96426785 190 * 500314 - add TAPGIFNAME to tap(4)
0df03f12 191 * 500315 - add TUNGIFNAME to tun(4)
233c8570 192 * 500316 - add SIOC[ADG]IFGROUP, SIOCGIFGMEMB ioctl
c229b0c5 193 * 500317 - add wait6() and waitid() syscalls
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194 * 500400 - 5.4 release
195 * 500500 - 5.5 development
66932323 196 * 500501 - reallocarray() added to libc
ee3ebee6 197 * 500502 - puffs etc. removed
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198 * 500503 - Lowered DATA rlimit supported by mmap(), libc sbrk() emulation
199 * had to be rewritten. libc brk() removed entirely. These changes
200 * are required to allow mmap hints to utilize lowered data rlimits.
94f03308 201 * 500504 - removed <sys/semaphore.h>, only <semaphore.h> remains
5c08cc45 202 * 500505 - rename <sys/termios.h> to <termios.h>
b0651b0c 203 * 500506 - LibreSSL, OpenSSH, XZ, libarchive update, libopie/libmd deprecation
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204 * 500600 - 5.6 release
205 * 500700 - 5.7 development
c0af9a0d 206 * 500701 - libopie/libmd removal
30be0dbc 207 * 500702 - TCP_KEEP* milliseconds -> seconds
9731fb3d 208 * 500703 - Static TLS bindings support for late-loaded shared libraries
76b765a3 209 * 500704 - Announce IP6 address flag changes via route(4)
e2e9821d 210 * 500705 - Move us to utmpx only, delete utmp
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211 * 500706 - Switch to the now common three argument versions of the
212 * timespecadd() and timespecsub() macros in <sys/time.h>
7aa02210 213 */
e9ddd87b 214#undef __DragonFly_version
944cd60c 215#define __DragonFly_version 500706 /* propagated to newvers */
d77e8324 216
e4dcda4d 217#include <sys/_null.h>
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218
219#ifndef LOCORE
220#include <sys/types.h>
221#endif
222
223/*
224 * Machine-independent constants (some used in following include files).
225 * Redefined constants are from POSIX 1003.1 limits file.
226 *
227 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
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228 */
229#include <sys/syslimits.h>
230
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231#define MAXCOMLEN 16 /* max command name remembered */
232#define MAXINTERP 32 /* max interpreter file name length */
e2e9821d 233#define MAXLOGNAME 33 /* max login name length (incl. NUL) */
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234#define MAXUPRC CHILD_MAX /* max simultaneous processes */
235#define NCARGS ARG_MAX /* max bytes for an exec function */
236#define NGROUPS NGROUPS_MAX /* max number groups */
237#define NOFILE OPEN_MAX /* max open files per process */
238#define NOGROUP 65535 /* marker for empty group set member */
984263bc 239#define MAXHOSTNAMELEN 256 /* max hostname size */
0f3a2b94 240#define SPECNAMELEN 63 /* max length of devicename */
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241
242/* More types and definitions used throughout the kernel. */
243#ifdef _KERNEL
244#include <sys/cdefs.h>
245#include <sys/errno.h>
246#include <sys/time.h>
247
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248#define FALSE 0
249#define TRUE 1
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250#endif
251
252#ifndef _KERNEL
253/* Signals. */
805f91d4 254#include <sys/select.h>
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255#include <sys/signal.h>
256#endif
257
258/* Machine type dependent parameters. */
259#include <machine/param.h>
260#ifndef _KERNEL
261#include <machine/limits.h>
262#endif
263
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264/*
265 * WARNING! Max supported cpu's due to PWAKEUP_CPUMASK is 16384.
266 */
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267#define PCATCH 0x00000100 /* tsleep checks signals */
268#define PUSRFLAG1 0x00000200 /* Subsystem specific flag */
d9345d3a 269#define PINTERLOCKED 0x00000400 /* Interlocked tsleep */
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270#define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */
271#define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */
fc17ad60 272#define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */
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273#define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */
274#define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */
b12defdc 275#define PDOMAIN_XLOCK 0x00020000 /* independant domain for fifo_lock */
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276#define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu))
277#define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK)
984263bc 278
6bb39c45 279#define NZERO 0 /* default "nice" */
984263bc 280
6bb39c45 281#define NBPW sizeof(int) /* number of bytes per word (integer) */
984263bc 282
6bb39c45 283#define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */
b13267a5 284#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
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285#define NOUDEV (udev_t)(-1) /* non-existent device */
286#define NOMAJ 256 /* non-existent device */
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287#endif
288
289#ifndef _KERNEL
6bb39c45 290#define NODEV (dev_t)(-1) /* non-existent device */
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291#endif
292
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293/*
294 * cpu_mi_feature bits
295 */
296#define CPU_MI_BZERONT 0x00000001
2a06bc07 297#define CPU_MI_MONITOR 0x00000010
d87e79b9 298
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299/*
300 * File system parameters and macros.
301 *
302 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes
303 * per block. MAXBSIZE may be made larger without effecting
304 * any existing filesystems as long as it does not exceed MAXPHYS,
305 * and may be made smaller at the risk of not being able to use
306 * filesystems which require a block size exceeding MAXBSIZE.
307 *
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308 * NBUFCALCSIZE - Calculate sufficient buffer cache buffers for the memory
309 * desired as if each buffer were sized to this value (actual
310 * real memory use). Hysteresis works both ways.
984263bc 311 */
80e89abc 312#define MAXBSIZE 65536 /* must be power of 2 */
dc6a6bd2 313#define NBUFCALCSIZE 16384 /* for nbuf calculation only */
80e89abc 314
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315#define MAXFRAG 8
316
317/*
318 * MAXPATHLEN defines the longest permissible path length after expanding
319 * symbolic links. It is used to allocate a temporary buffer from the buffer
320 * pool in which to do the name expansion, hence should be a power of two,
321 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the
322 * maximum number of symbolic links that may be expanded in a path name.
323 * It should be set high enough to allow all legitimate uses, but halt
324 * infinite loops reasonably quickly.
325 */
6bb39c45 326#define MAXPATHLEN PATH_MAX
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327#define MAXSYMLINKS 32
328
329/* Bit map related macros. */
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330#define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
331#define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
332#define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
333#define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
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334
335/* Macros for counting and rounding. */
336#ifndef howmany
6bb39c45 337#define howmany(x, y) (((x)+((y)-1))/(y))
984263bc 338#endif
70675b40 339#define nitems(x) NELEM(x)
6bb39c45 340#define rounddown(x, y) (((x)/(y))*(y))
a8cf2878 341#define rounddown2(x, y) ((x) & ~((y) - 1)) /* y power of two */
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342#define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
343#define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
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344#define powerof2(x) ((((x)-1)&(x))==0)
345
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346/*
347 * VM objects can be larger than the virtual address space, make sure
348 * we don't cut-off the mask.
349 */
350#define trunc_page64(x) ((x) & ~(int64_t)PAGE_MASK)
351#define round_page64(x) (((x) + PAGE_MASK) & ~(int64_t)PAGE_MASK)
352
984263bc 353/* Macros for min/max. */
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354#define MIN(a,b) (((a)<(b))?(a):(b))
355#define MAX(a,b) (((a)>(b))?(a):(b))
984263bc 356
a3034532 357/* Macro for array size */
fa8f7852 358#define NELEM(ary) (sizeof(ary) / sizeof((ary)[0]))
a3034532 359
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360/*
361 * Constants for setting the parameters of the kernel memory allocator.
362 *
363 * 2 ** MINBUCKET is the smallest unit of memory that will be
364 * allocated. It must be at least large enough to hold a pointer.
365 *
366 * Units of memory less or equal to MAXALLOCSAVE will permanently
367 * allocate physical memory; requests for these size pieces of
368 * memory are quite fast. Allocations greater than MAXALLOCSAVE must
369 * always allocate and free physical memory; requests for these
370 * size allocations should be done infrequently as they will be slow.
371 *
372 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
373 * MAXALLOCSIZE must be a power of two.
374 */
984263bc 375#define MINBUCKET 4 /* 4 => min allocation of 16 bytes */
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376#define MAXALLOCSAVE (2 * PAGE_SIZE)
377
378/*
379 * Scale factor for scaled integers used to count %cpu time and load avgs.
380 *
381 * The number of CPU `tick's that map to a unique `%age' can be expressed
382 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that
383 * can be calculated (assuming 32 bits) can be closely approximated using
384 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
385 *
386 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
387 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
388 */
6bb39c45 389#define FSHIFT 11 /* bits to right of fixed binary point */
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390#define FSCALE (1<<FSHIFT)
391
392#define dbtoc(db) /* calculates devblks to pages */ \
393 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
394
395#define ctodb(db) /* calculates pages to devblks */ \
396 ((db) << (PAGE_SHIFT - DEV_BSHIFT))
397
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398#define MJUMPAGESIZE PAGE_SIZE /* jumbo cluster 4k */
399#define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */
400#define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */
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401
402/*
403 * MBUF Management.
404 *
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405 * Because many drivers can't deal with multiple DMA segments all mbufs
406 * must avoid crossing a page boundary. While we can accomodate mbufs
407 * which are not a power-of-2 sized kmalloc() will only guarantee
408 * non-crossing alignment if we use a power-of-2. 256 is no longer large
409 * enough due to m_hdr and m_pkthdr bloat.
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410 *
411 * MCLBYTES must be a power of 2 and is typically significantly larger
412 * than MSIZE, sufficient to hold a standard-mtu packet. 2K is considered
413 * reasonable.
414 */
415#ifndef MSIZE
ee9d7228 416#define MSIZE 512 /* size of an mbuf */
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417#endif
418
419#ifndef MCLSHIFT
94eaee9a 420#define MCLSHIFT 11 /* convert bytes to m_buf clusters */
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421#endif
422#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */
423#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */
424
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425/*
426 * Make this available for most of the kernel. There were too many
427 * things that included sys/systm.h just for panic().
428 */
429#ifdef _KERNEL
b153f746 430void panic (const char *, ...) __dead2 __printflike(1, 2);
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431#endif
432
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433#ifndef htonl
434#define htonl(x) __htonl(x)
435#endif
436#ifndef htons
437#define htons(x) __htons(x)
438#endif
439#ifndef ntohl
440#define ntohl(x) __ntohl(x)
441#endif
442#ifndef ntohs
443#define ntohs(x) __ntohs(x)
444#endif
445
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446/*
447 * Access a variable length array that has been declared as a fixed
448 * length array.
449 */
450#define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset])
451
984263bc 452#endif /* _SYS_PARAM_H_ */