xref: /illumos-gate/usr/src/head/limits.h (revision 8e9352593f28b1a84101b11e1c6db6aabf187a1c)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright (c) 2013 Gary Mills
24  * Copyright 2017 RackTop Systems.
25  *
26  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
27  * Use is subject to license terms.
28  * Copyright 2015 Joyent, Inc.  All rights reserved.
29  */
30 
31 /*	Copyright (c) 1988 AT&T	*/
32 /*	  All Rights Reserved	*/
33 
34 
35 #ifndef _LIMITS_H
36 #define	_LIMITS_H
37 
38 #include <sys/feature_tests.h>
39 #include <sys/isa_defs.h>
40 #include <iso/limits_iso.h>
41 #include <sys/limits.h>
42 
43 /*
44  * Include fixed width type limits as proposed by the ISO/JTC1/SC22/WG14 C
45  * committee's working draft for the revision of the current ISO C standard,
46  * ISO/IEC 9899:1990 Programming language - C.  These are not currently
47  * required by any standard but constitute a useful, general purpose set
48  * of type definitions and limits which is namespace clean with respect to
49  * all standards.
50  */
51 #if defined(__EXTENSIONS__) || !defined(_STRICT_STDC) || \
52 	defined(__XOPEN_OR_POSIX)
53 #include <sys/int_limits.h>
54 #endif
55 
56 #ifdef	__cplusplus
57 extern "C" {
58 #endif
59 
60 #if defined(__EXTENSIONS__) || !defined(_STRICT_STDC) || \
61 	defined(__XOPEN_OR_POSIX)
62 
63 #define	SSIZE_MAX	LONG_MAX	/* max value of an "ssize_t" */
64 
65 /*
66  * ARG_MAX is calculated as follows:
67  * NCARGS - space for other stuff on initial stack
68  * like aux vectors, saved registers, etc..
69  */
70 #define	_ARG_MAX32	1048320	/* max length of args to exec 32-bit program */
71 #define	_ARG_MAX64	2096640	/* max length of args to exec 64-bit program */
72 #ifdef	_LP64
73 #define	ARG_MAX		_ARG_MAX64	/* max length of arguments to exec */
74 #else	/* _LP64 */
75 #define	ARG_MAX		_ARG_MAX32	/* max length of arguments to exec */
76 #endif	/* _LP64 */
77 
78 
79 /*
80  * These two symbols have their historical values, the actual buffer is
81  * larger.
82  */
83 #ifndef MAX_CANON
84 #define	MAX_CANON	256	/* max bytes in line for canonical processing */
85 #endif
86 
87 #ifndef MAX_INPUT
88 #define	MAX_INPUT	512	/* max size of a char input buffer */
89 #endif
90 
91 #define	NGROUPS_MAX	16	/* max number of groups for a user */
92 
93 #ifndef PATH_MAX
94 #define	PATH_MAX	1024	/* max # of characters in a path name */
95 #endif
96 
97 #define	SYMLINK_MAX	1024	/* max # of characters a symlink can contain */
98 
99 #define	PIPE_BUF	5120	/* max # bytes atomic in write to a pipe */
100 
101 #ifndef TMP_MAX
102 #define	TMP_MAX		17576	/* 26 * 26 * 26 */
103 #endif
104 
105 /*
106  * POSIX conformant definitions - An implementation may define
107  * other symbols which reflect the actual implementation. Alternate
108  * definitions may not be as restrictive as the POSIX definitions.
109  */
110 #define	_POSIX_AIO_LISTIO_MAX	    2
111 #define	_POSIX_AIO_MAX		    1
112 #define	_POSIX_ARG_MAX		 4096
113 #ifdef _XPG6
114 #define	_POSIX_CHILD_MAX	   25
115 #else
116 #define	_POSIX_CHILD_MAX	    6	/* POSIX.1-1990 default */
117 #endif
118 #define	_POSIX_CLOCKRES_MIN	20000000
119 #define	_POSIX_DELAYTIMER_MAX	   32
120 #define	_POSIX_LINK_MAX		    8
121 #define	_POSIX_MAX_CANON	  255
122 #define	_POSIX_MAX_INPUT	  255
123 #define	_POSIX_MQ_OPEN_MAX	    8
124 #define	_POSIX_MQ_PRIO_MAX	   32
125 #define	_POSIX_NAME_MAX		   14
126 #ifdef _XPG6
127 #define	_POSIX_NGROUPS_MAX	    8
128 #define	_POSIX_OPEN_MAX		   20
129 #define	_POSIX_PATH_MAX		  256
130 #else					/* POSIX.1-1990 defaults */
131 #define	_POSIX_NGROUPS_MAX	    0
132 #define	_POSIX_OPEN_MAX		   16
133 #define	_POSIX_PATH_MAX		  255
134 #endif
135 #define	_POSIX_PIPE_BUF		  512
136 #define	_POSIX_RTSIG_MAX	    8
137 #define	_POSIX_SEM_NSEMS_MAX	  256
138 #define	_POSIX_SEM_VALUE_MAX	32767
139 #define	_POSIX_SIGQUEUE_MAX	   32
140 #define	_POSIX_SSIZE_MAX	32767
141 #define	_POSIX_STREAM_MAX	    8
142 #define	_POSIX_TIMER_MAX	   32
143 #ifdef _XPG6
144 #define	_POSIX_TZNAME_MAX	    6
145 #else
146 #define	_POSIX_TZNAME_MAX	    3	/* POSIX.1-1990 default */
147 #endif
148 /* POSIX.1c conformant */
149 #define	_POSIX_LOGIN_NAME_MAX			9
150 #define	_POSIX_THREAD_DESTRUCTOR_ITERATIONS	4
151 #define	_POSIX_THREAD_KEYS_MAX			128
152 #define	_POSIX_THREAD_THREADS_MAX		64
153 #define	_POSIX_TTY_NAME_MAX			9
154 /* UNIX 03 conformant */
155 #define	_POSIX_HOST_NAME_MAX			255
156 #define	_POSIX_RE_DUP_MAX			255
157 #define	_POSIX_SYMLINK_MAX			255
158 #define	_POSIX_SYMLOOP_MAX			8
159 
160 /*
161  * POSIX.2 and XPG4-XSH4 conformant definitions
162  */
163 
164 #define	_POSIX2_BC_BASE_MAX		  99
165 #define	_POSIX2_BC_DIM_MAX		2048
166 #define	_POSIX2_BC_SCALE_MAX		  99
167 #define	_POSIX2_BC_STRING_MAX		1000
168 #define	_POSIX2_COLL_WEIGHTS_MAX	   2
169 #define	_POSIX2_EXPR_NEST_MAX		  32
170 #define	_POSIX2_LINE_MAX		2048
171 #define	_POSIX2_RE_DUP_MAX		 255
172 /* UNIX 03 conformant */
173 #define	_POSIX2_CHARCLASS_NAME_MAX	  14
174 
175 #define	BC_BASE_MAX		_POSIX2_BC_BASE_MAX
176 #define	BC_DIM_MAX		_POSIX2_BC_DIM_MAX
177 #define	BC_SCALE_MAX		_POSIX2_BC_SCALE_MAX
178 #define	BC_STRING_MAX		_POSIX2_BC_STRING_MAX
179 #define	COLL_WEIGHTS_MAX	10
180 #define	EXPR_NEST_MAX		_POSIX2_EXPR_NEST_MAX
181 #define	LINE_MAX		_POSIX2_LINE_MAX
182 #if !defined(_XPG6)
183 #define	RE_DUP_MAX		_POSIX2_RE_DUP_MAX
184 #else
185 #define	RE_DUP_MAX		_POSIX_RE_DUP_MAX
186 #endif /* !defined(_XPG6) */
187 
188 #endif /* defined(__EXTENSIONS__) || !defined(_STRICT_STDC) ... */
189 
190 #if defined(__EXTENSIONS__) || \
191 	(!defined(_STRICT_STDC) && !defined(_POSIX_C_SOURCE)) || \
192 	defined(_XOPEN_SOURCE)
193 
194 /*
195  * For dual definitions for PASS_MAX and sysconf.c
196  */
197 #define	_PASS_MAX_XPG	8	/* old standards PASS_MAX */
198 #define	_PASS_MAX	256	/* modern Solaris PASS_MAX */
199 
200 #if defined(_XPG3) && !defined(_XPG6)
201 #define	PASS_MAX	_PASS_MAX_XPG	/* max # of characters in a password */
202 #else	/* XPG6 or just Solaris */
203 #define	PASS_MAX	_PASS_MAX	/* max # of characters in a password */
204 #endif	/* defined(_XPG3) && !defined(_XPG6) */
205 
206 #define	CHARCLASS_NAME_MAX	_POSIX2_CHARCLASS_NAME_MAX
207 
208 #define	NL_ARGMAX	9	/* max value of "digit" in calls to the	*/
209 				/* NLS printf() and scanf() */
210 #define	NL_LANGMAX	14	/* max # of bytes in a LANG name */
211 #define	NL_MSGMAX	32767	/* max message number */
212 #define	NL_NMAX		1	/* max # bytes in N-to-1 mapping characters */
213 #define	NL_SETMAX	255	/* max set number */
214 #define	NL_TEXTMAX	2048	/* max set number */
215 #define	NZERO		20	/* default process priority */
216 
217 #define	WORD_BIT	32	/* # of bits in a "word" or "int" */
218 #if defined(_LP64)
219 #define	LONG_BIT	64	/* # of bits in a "long" */
220 #else	/* _ILP32 */
221 #define	LONG_BIT	32	/* # of bits in a "long" */
222 #endif
223 
224 /* Marked as LEGACY in SUSv2 and removed in UNIX 03 */
225 #ifndef _XPG6
226 #define	DBL_DIG		15	/* digits of precision of a "double" */
227 #define	DBL_MAX		1.7976931348623157081452E+308	/* max decimal value */
228 							/* of a double */
229 #define	FLT_DIG		6		/* digits of precision of a "float" */
230 #define	FLT_MAX		3.4028234663852885981170E+38F	/* max decimal value */
231 							/* of a "float" */
232 #endif
233 
234 /* Marked as LEGACY in SUSv1 and removed in SUSv2 */
235 #ifndef _XPG5
236 #define	DBL_MIN		2.2250738585072013830903E-308	/* min decimal value */
237 							/* of a double */
238 #define	FLT_MIN		1.1754943508222875079688E-38F	/* min decimal value */
239 							/* of a float */
240 #endif
241 
242 #endif	/* defined(__EXTENSIONS__) || (!defined(_STRICT_STDC) ... */
243 
244 #define	_XOPEN_IOV_MAX	16	/* max # iovec/process with readv()/writev() */
245 #define	_XOPEN_NAME_MAX	255	/* max # bytes in filename excluding null */
246 #define	_XOPEN_PATH_MAX	1024	/* max # bytes in a pathname */
247 
248 #if defined(__EXTENSIONS__) || \
249 	(!defined(_STRICT_STDC) && !defined(__XOPEN_OR_POSIX))
250 
251 #define	FCHR_MAX	1048576		/* max size of a file in bytes */
252 #define	PID_MAX		999999		/* max value for a process ID */
253 
254 /*
255  * POSIX 1003.1a, section 2.9.5, table 2-5 contains [NAME_MAX] and the
256  * related text states:
257  *
258  * A definition of one of the values from Table 2-5 shall be omitted from the
259  * <limits.h> on specific implementations where the corresponding value is
260  * equal to or greater than the stated minimum, but where the value can vary
261  * depending on the file to which it is applied. The actual value supported for
262  * a specific pathname shall be provided by the pathconf() (5.7.1) function.
263  *
264  * This is clear that any machine supporting multiple file system types
265  * and/or a network should not include this define, regardless of protection
266  * by the _POSIX_SOURCE and _POSIX_C_SOURCE flags. We chose to ignore that
267  * and provide it anyway for compatibility with other platforms that don't
268  * follow the spec as precisely as they should. Its usage is discouraged.
269  */
270 #define	NAME_MAX	255
271 
272 #define	CHILD_MAX	25	/* max # of processes per user id */
273 #ifndef OPEN_MAX
274 #define	OPEN_MAX	256	/* max # of files a process can have open */
275 #endif
276 
277 #define	PIPE_MAX	5120	/* max # bytes written to a pipe in a write */
278 
279 #define	STD_BLK		1024	/* # bytes in a physical I/O block */
280 #define	UID_MAX		2147483647	/* max value for a user or group ID */
281 #define	USI_MAX		4294967295	/* max decimal value of an "unsigned" */
282 #define	SYSPID_MAX	1	/* max pid of system processes */
283 
284 #ifndef SYS_NMLN		/* also defined in sys/utsname.h */
285 #define	SYS_NMLN	257	/* 4.0 size of utsname elements */
286 #endif
287 
288 #ifndef CLK_TCK
289 
290 #if !defined(_CLOCK_T) || __cplusplus >= 199711L
291 #define	_CLOCK_T
292 typedef long	clock_t;
293 #endif	/* !_CLOCK_T */
294 
295 extern long _sysconf(int);	/* System Private interface to sysconf() */
296 #define	CLK_TCK	((clock_t)_sysconf(3))	/* 3 is _SC_CLK_TCK */
297 
298 #endif /* CLK_TCK */
299 
300 #ifdef	__USE_LEGACY_LOGNAME__
301 #define	LOGNAME_MAX	8	/* max # of characters in a login name */
302 #else	/* __USE_LEGACY_LOGNAME__ */
303 #define	LOGNAME_MAX	32	/* max # of characters in a login name */
304 				/* Increased for illumos */
305 #endif	/* __USE_LEGACY_LOGNAME__ */
306 #define	LOGIN_NAME_MAX	(LOGNAME_MAX + 1)	/* max buffer size */
307 #define	LOGNAME_MAX_TRAD	8		/* traditional length */
308 #define	LOGIN_NAME_MAX_TRAD	(LOGNAME_MAX_TRAD + 1)	/* and size */
309 
310 #define	TTYNAME_MAX	128	/* max # of characters in a tty name */
311 
312 #endif	/* if defined(__EXTENSIONS__) || (!defined(_STRICT_STDC) ... */
313 
314 #if	defined(__EXTENSIONS__) || (_POSIX_C_SOURCE >= 199506L)
315 #include <sys/unistd.h>
316 
317 #if !defined(_SIZE_T) || __cplusplus >= 199711L
318 #define	_SIZE_T
319 #if defined(_LP64) || defined(_I32LPx)
320 typedef	unsigned long size_t;	/* size of something in bytes */
321 #else
322 typedef	unsigned int  size_t;	/* (historical version) */
323 #endif
324 #endif	/* _SIZE_T */
325 
326 extern long _sysconf(int);	/* System Private interface to sysconf() */
327 
328 #define	PTHREAD_STACK_MIN	((size_t)_sysconf(_SC_THREAD_STACK_MIN))
329 /* Added for UNIX98 conformance */
330 #define	PTHREAD_DESTRUCTOR_ITERATIONS	_POSIX_THREAD_DESTRUCTOR_ITERATIONS
331 #define	PTHREAD_KEYS_MAX		_POSIX_THREAD_KEYS_MAX
332 #define	PTHREAD_THREADS_MAX		_POSIX_THREAD_THREADS_MAX
333 #endif	/* defined(__EXTENSIONS__) || (_POSIX_C_SOURCE >= 199506L) */
334 
335 #ifdef	__cplusplus
336 }
337 #endif
338 
339 #endif	/* _LIMITS_H */
340