xref: /illumos-gate/usr/src/lib/libc/port/gen/sysconf.c (revision 4c46c814833d7980b7ebf54590a97d7f91472bd5)
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  *
25  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
26  * Use is subject to license terms.
27  */
28 
29 /*	Copyright (c) 1988 AT&T	*/
30 /*	  All Rights Reserved	*/
31 
32 /* sysconf(3C) - returns system configuration information */
33 
34 #pragma weak _sysconf = sysconf
35 
36 #include "lint.h"
37 #include <mtlib.h>
38 #include <sys/types.h>
39 #include <unistd.h>
40 #include <sys/sysconfig.h>
41 #include <limits.h>
42 #include <time.h>
43 #include <errno.h>
44 #include <nss_dbdefs.h>
45 #include <thread.h>
46 #include <xti.h>
47 #include "libc.h"
48 #include "xpg6.h"
49 
50 /* from nss_common.c */
51 extern size_t _nss_get_bufsizes(int);
52 
53 long
sysconf(int name)54 sysconf(int name)
55 {
56 	static int _pagesize = 0;
57 	static int _hz = 0;
58 	static pid_t _maxpid = 0;
59 	static int _stackprot = 0;
60 	static int _ngroups_max;
61 	extern int __xpg4;
62 
63 	switch (name) {
64 		default:
65 			errno = EINVAL;
66 			return (-1L);
67 
68 		case _SC_ARG_MAX:
69 			return ((long)ARG_MAX);
70 
71 		case _SC_CLK_TCK:
72 			if (_hz <= 0)
73 				_hz = _sysconfig(_CONFIG_CLK_TCK);
74 			return (_hz);
75 
76 		case _SC_JOB_CONTROL:
77 			return ((long)_POSIX_JOB_CONTROL);
78 
79 		case _SC_SAVED_IDS:
80 			return ((long)_POSIX_SAVED_IDS);
81 
82 		case _SC_CHILD_MAX:
83 			return (_sysconfig(_CONFIG_CHILD_MAX));
84 
85 		case _SC_NGROUPS_MAX:
86 			if (_ngroups_max <= 0)
87 				_ngroups_max = _sysconfig(_CONFIG_NGROUPS);
88 			return (_ngroups_max);
89 
90 		case _SC_OPEN_MAX:
91 			return (_sysconfig(_CONFIG_OPEN_FILES));
92 
93 		case _SC_VERSION:
94 			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)
95 				return (200112L);
96 			else
97 				return (199506L);
98 
99 		case _SC_PAGESIZE:
100 			if (_pagesize <= 0)
101 				_pagesize = _sysconfig(_CONFIG_PAGESIZE);
102 			return (_pagesize);
103 
104 		case _SC_XOPEN_VERSION:
105 			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)
106 				return (600L);
107 			else if (__xpg4 == 0)
108 				return (_sysconfig(_CONFIG_XOPEN_VER));
109 			else
110 				return (4L);
111 
112 		case _SC_XOPEN_XCU_VERSION:
113 			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)
114 				return (600L);
115 			else
116 				return (4L);
117 
118 		/*
119 		 * old value for pre XPG5 conformant systems to match
120 		 * getpass() length.
121 		 * XPG5 special cased with __sysconf_xpg5()
122 		 * new value for default and modern XPG systems.
123 		 */
124 		case _SC_PASS_MAX:
125 			if ((__xpg4 == 1) &&
126 			    (!(__xpg6 & _C99SUSv3_XPG6_sysconf_version)))
127 				return ((long)_PASS_MAX_XPG);
128 			else
129 				return ((long)_PASS_MAX);
130 
131 		case _SC_LOGNAME_MAX:
132 			return ((long)LOGNAME_MAX);
133 
134 		case _SC_STREAM_MAX:
135 			return (_sysconfig(_CONFIG_OPEN_FILES));
136 
137 		case _SC_TZNAME_MAX:
138 			return (-1L);
139 
140 		case _SC_NPROCESSORS_CONF:
141 			return (_sysconfig(_CONFIG_NPROC_CONF));
142 
143 		case _SC_NPROCESSORS_ONLN:
144 			return (_sysconfig(_CONFIG_NPROC_ONLN));
145 
146 		case _SC_NPROCESSORS_MAX:
147 			return (_sysconfig(_CONFIG_NPROC_MAX));
148 
149 		case _SC_STACK_PROT:
150 			if (_stackprot == 0)
151 				_stackprot = _sysconfig(_CONFIG_STACK_PROT);
152 			return (_stackprot);
153 
154 		/* POSIX.4 names */
155 
156 		/*
157 		 * Each of the following also have _POSIX_* symbols
158 		 * defined in <unistd.h>. Values here should align
159 		 * with values in the header. Up until the SUSv3 standard
160 		 * we defined these simply as 1. With the introduction
161 		 * of the new revision, these were changed to 200112L.
162 		 * The standard allows us to change the value, however,
163 		 * we have kept both values in case application programs
164 		 * are relying on the previous value even though an
165 		 * application doing so is technically wrong.
166 		 */
167 		case _SC_ASYNCHRONOUS_IO:
168 		case _SC_FSYNC:
169 		case _SC_MAPPED_FILES:
170 		case _SC_MEMLOCK:
171 		case _SC_MEMLOCK_RANGE:
172 		case _SC_MEMORY_PROTECTION:
173 		case _SC_MESSAGE_PASSING:
174 		case _SC_PRIORITY_SCHEDULING:
175 		case _SC_REALTIME_SIGNALS:
176 		case _SC_SEMAPHORES:
177 		case _SC_SHARED_MEMORY_OBJECTS:
178 		case _SC_SYNCHRONIZED_IO:
179 		case _SC_TIMERS:
180 			if (__xpg6 & _C99SUSv3_mode_ON)
181 				return (200112L);
182 			else
183 				return (1L);
184 
185 		case _SC_PRIORITIZED_IO:
186 #ifdef _POSIX_PRIORITIZED_IO
187 			return (1L);
188 #else
189 			return (-1L);
190 #endif
191 
192 		case _SC_AIO_LISTIO_MAX:
193 			return (_sysconfig(_CONFIG_AIO_LISTIO_MAX));
194 
195 		case _SC_AIO_MAX:
196 			return (_sysconfig(_CONFIG_AIO_MAX));
197 
198 		case _SC_AIO_PRIO_DELTA_MAX:
199 			return (_sysconfig(_CONFIG_AIO_PRIO_DELTA_MAX));
200 
201 		case _SC_DELAYTIMER_MAX:
202 			return (_sysconfig(_CONFIG_DELAYTIMER_MAX));
203 
204 		case _SC_MQ_OPEN_MAX:
205 			return (_sysconfig(_CONFIG_MQ_OPEN_MAX));
206 
207 		case _SC_MQ_PRIO_MAX:
208 			return (_sysconfig(_CONFIG_MQ_PRIO_MAX));
209 
210 		case _SC_RTSIG_MAX:
211 			return (_sysconfig(_CONFIG_RTSIG_MAX));
212 
213 		case _SC_SEM_NSEMS_MAX:
214 			return (_sysconfig(_CONFIG_SEM_NSEMS_MAX));
215 
216 		case _SC_SEM_VALUE_MAX:
217 			return (_sysconfig(_CONFIG_SEM_VALUE_MAX));
218 
219 		case _SC_SIGQUEUE_MAX:
220 			return (_sysconfig(_CONFIG_SIGQUEUE_MAX));
221 
222 		case _SC_SIGRT_MAX:
223 			return (_sysconfig(_CONFIG_SIGRT_MAX));
224 
225 		case _SC_SIGRT_MIN:
226 			return (_sysconfig(_CONFIG_SIGRT_MIN));
227 
228 		case _SC_TIMER_MAX:
229 			return (_sysconfig(_CONFIG_TIMER_MAX));
230 
231 		case _SC_PHYS_PAGES:
232 			return (_sysconfig(_CONFIG_PHYS_PAGES));
233 
234 		case _SC_AVPHYS_PAGES:
235 			return (_sysconfig(_CONFIG_AVPHYS_PAGES));
236 
237 		/* XPG4/POSIX.1-1990/POSIX.2-1992 names */
238 		case _SC_2_C_BIND:
239 			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)
240 				return (200112L);
241 			else
242 				return (1L);
243 
244 		case _SC_2_CHAR_TERM:
245 			return ((long)_POSIX2_CHAR_TERM);
246 
247 		case _SC_2_C_DEV:
248 			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)
249 				return (200112L);
250 			else
251 				return (1L);
252 
253 		case _SC_2_C_VERSION:
254 			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)
255 				return (200112L);
256 			else
257 				return (199209L);
258 
259 		case _SC_2_FORT_DEV:
260 			return (-1L);
261 
262 		case _SC_2_FORT_RUN:
263 			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)
264 				return (200112L);
265 			else
266 				return (1L);
267 
268 		case _SC_2_LOCALEDEF:
269 			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)
270 				return (200112L);
271 			else
272 				return (1L);
273 
274 		case _SC_2_SW_DEV:
275 			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)
276 				return (200112L);
277 			else
278 				return (1L);
279 
280 		case _SC_2_UPE:
281 			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)
282 				return (200112L);
283 			else
284 				return (1L);
285 
286 		case _SC_2_VERSION:
287 			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)
288 				return (200112L);
289 			else
290 				return (199209L);
291 
292 		case _SC_BC_BASE_MAX:
293 			return ((long)BC_BASE_MAX);
294 
295 		case _SC_BC_DIM_MAX:
296 			return ((long)BC_DIM_MAX);
297 
298 		case _SC_BC_SCALE_MAX:
299 			return ((long)BC_SCALE_MAX);
300 
301 		case _SC_BC_STRING_MAX:
302 			return ((long)BC_STRING_MAX);
303 
304 		case _SC_COLL_WEIGHTS_MAX:
305 			return ((long)COLL_WEIGHTS_MAX);
306 
307 		case _SC_EXPR_NEST_MAX:
308 			return ((long)EXPR_NEST_MAX);
309 
310 		case _SC_LINE_MAX:
311 			return ((long)LINE_MAX);
312 
313 		case _SC_RE_DUP_MAX:
314 			return ((long)RE_DUP_MAX);
315 
316 		case _SC_XOPEN_CRYPT:
317 			return (1L);
318 
319 		case _SC_XOPEN_ENH_I18N:
320 			return ((long)_XOPEN_ENH_I18N);
321 
322 		case _SC_XOPEN_SHM:
323 			return ((long)_XOPEN_SHM);
324 
325 		/* XPG4v2 (SUS) names */
326 		case _SC_XOPEN_UNIX:
327 			return (1L);
328 
329 		case _SC_XOPEN_LEGACY:
330 			return (1L);
331 
332 		case _SC_ATEXIT_MAX:
333 			return (-1L);
334 
335 		case _SC_IOV_MAX:
336 			return ((long)IOV_MAX);
337 
338 		case _SC_T_IOV_MAX:
339 			return ((long)T_IOV_MAX);
340 
341 		/* XPG5 (SUSv2) names */
342 		case _SC_XOPEN_REALTIME:
343 			return (1L);
344 
345 		case _SC_XOPEN_REALTIME_THREADS:
346 #if defined(_POSIX_THREAD_PRIORITY_SCHEDULING) && \
347 	defined(_POSIX_THREAD_PRIO_INHERIT) && \
348 	defined(_POSIX_THREAD_PRIO_PROTECT)
349 			return (1L);
350 #else
351 			return (-1L);
352 #endif
353 
354 		case _SC_XBS5_ILP32_OFF32:
355 			return (1L);
356 
357 		case _SC_XBS5_ILP32_OFFBIG:
358 			return (1L);
359 
360 		case _SC_XBS5_LP64_OFF64:
361 			return (1L);
362 
363 		case _SC_XBS5_LPBIG_OFFBIG:
364 			return (1L);
365 
366 		/* POSIX.1c names */
367 		case _SC_THREAD_DESTRUCTOR_ITERATIONS:
368 			return (-1L);
369 
370 		case _SC_GETGR_R_SIZE_MAX:
371 			return ((long)_nss_get_bufsizes(_SC_GETGR_R_SIZE_MAX));
372 
373 		case _SC_GETPW_R_SIZE_MAX:
374 			return ((long)NSS_BUFLEN_PASSWD);
375 
376 		case _SC_LOGIN_NAME_MAX:
377 			return ((long)(LOGIN_NAME_MAX));
378 
379 		case _SC_THREAD_KEYS_MAX:
380 			return (-1L);
381 
382 		case _SC_THREAD_STACK_MIN:
383 			return ((long)thr_min_stack());
384 
385 		case _SC_THREAD_THREADS_MAX:
386 			return (-1L);
387 
388 		case _SC_TTY_NAME_MAX:
389 			return ((long)TTYNAME_MAX);
390 
391 		case _SC_BARRIERS:
392 			return ((long)_POSIX_BARRIERS);
393 
394 		case _SC_CLOCK_SELECTION:
395 			return ((long)_POSIX_CLOCK_SELECTION);
396 
397 		case _SC_MONOTONIC_CLOCK:
398 			return ((long)_POSIX_MONOTONIC_CLOCK);
399 
400 		case _SC_SPAWN:
401 			return ((long)_POSIX_SPAWN);
402 
403 		case _SC_SPIN_LOCKS:
404 			return ((long)_POSIX_SPIN_LOCKS);
405 
406 		case _SC_THREADS:
407 		case _SC_THREAD_ATTR_STACKADDR:
408 		case _SC_THREAD_ATTR_STACKSIZE:
409 		case _SC_THREAD_PRIORITY_SCHEDULING:
410 		case _SC_THREAD_PRIO_INHERIT:
411 		case _SC_THREAD_PRIO_PROTECT:
412 		case _SC_THREAD_PROCESS_SHARED:
413 		case _SC_THREAD_SAFE_FUNCTIONS:
414 			if (__xpg6 & _C99SUSv3_mode_ON)
415 				return (200112L);
416 			else
417 				return (1L);
418 
419 		case _SC_TIMEOUTS:
420 			return ((long)_POSIX_TIMEOUTS);
421 
422 		/* 1216676 - cache info */
423 		case _SC_COHER_BLKSZ:
424 			return (_sysconfig(_CONFIG_COHERENCY));
425 
426 		case _SC_SPLIT_CACHE:
427 			return (_sysconfig(_CONFIG_SPLIT_CACHE));
428 
429 		case _SC_ICACHE_SZ:
430 			return (_sysconfig(_CONFIG_ICACHESZ));
431 
432 		case _SC_DCACHE_SZ:
433 			return (_sysconfig(_CONFIG_DCACHESZ));
434 
435 		case _SC_ICACHE_LINESZ:
436 			return (_sysconfig(_CONFIG_ICACHELINESZ));
437 
438 		case _SC_DCACHE_LINESZ:
439 			return (_sysconfig(_CONFIG_DCACHELINESZ));
440 
441 		case _SC_ICACHE_BLKSZ:
442 			return (_sysconfig(_CONFIG_ICACHEBLKSZ));
443 
444 		case _SC_DCACHE_BLKSZ:
445 			return (_sysconfig(_CONFIG_DCACHEBLKSZ));
446 
447 		case _SC_DCACHE_TBLKSZ:
448 			return (_sysconfig(_CONFIG_DCACHETBLKSZ));
449 
450 		case _SC_ICACHE_ASSOC:
451 			return (_sysconfig(_CONFIG_ICACHE_ASSOC));
452 
453 		case _SC_DCACHE_ASSOC:
454 			return (_sysconfig(_CONFIG_DCACHE_ASSOC));
455 
456 		case _SC_MAXPID:
457 			if (_maxpid <= 0)
458 				_maxpid = _sysconfig(_CONFIG_MAXPID);
459 			return (_maxpid);
460 
461 		case _SC_CPUID_MAX:
462 			return (_sysconfig(_CONFIG_CPUID_MAX));
463 
464 		case _SC_EPHID_MAX:
465 			return (_sysconfig(_CONFIG_EPHID_MAX));
466 
467 		case _SC_UADDR_MAX:
468 			return (_sysconfig(_CONFIG_UADDR_MAX));
469 
470 		/* UNIX 03 names - XPG6/SUSv3/POSIX.1-2001 */
471 
472 		case _SC_REGEXP:
473 			return ((long)_POSIX_REGEXP);
474 
475 		case _SC_SHELL:
476 			return ((long)_POSIX_SHELL);
477 
478 		case _SC_ADVISORY_INFO:
479 			return ((long)_POSIX_ADVISORY_INFO);
480 
481 		case _SC_HOST_NAME_MAX:
482 			return ((long)_POSIX_HOST_NAME_MAX);
483 
484 		case _SC_READER_WRITER_LOCKS:
485 			return ((long)_POSIX_READER_WRITER_LOCKS);
486 
487 		case _SC_IPV6:
488 			return ((long)_POSIX_IPV6);
489 
490 		case _SC_RAW_SOCKETS:
491 			return ((long)_POSIX_RAW_SOCKETS);
492 
493 		case _SC_XOPEN_STREAMS:
494 			return ((long)_XOPEN_STREAMS);
495 
496 		case _SC_SYMLOOP_MAX:
497 			return (_sysconfig(_CONFIG_SYMLOOP_MAX));
498 
499 		case _SC_V6_ILP32_OFF32:
500 			return (1L);
501 
502 		case _SC_V6_ILP32_OFFBIG:
503 			return (1L);
504 
505 		case _SC_V6_LP64_OFF64:
506 			return (1L);
507 
508 		case _SC_V6_LPBIG_OFFBIG:
509 			return (1L);
510 
511 		/* Unsupported UNIX 03 options */
512 		case _SC_2_PBS:
513 		case _SC_2_PBS_ACCOUNTING:
514 		case _SC_2_PBS_CHECKPOINT:
515 		case _SC_2_PBS_LOCATE:
516 		case _SC_2_PBS_MESSAGE:
517 		case _SC_2_PBS_TRACK:
518 		case _SC_CPUTIME:
519 		case _SC_SPORADIC_SERVER:
520 		case _SC_SS_REPL_MAX:
521 		case _SC_THREAD_CPUTIME:
522 		case _SC_THREAD_SPORADIC_SERVER:
523 		case _SC_TRACE:
524 		case _SC_TRACE_EVENT_FILTER:
525 		case _SC_TRACE_EVENT_NAME_MAX:
526 		case _SC_TRACE_INHERIT:
527 		case _SC_TRACE_LOG:
528 		case _SC_TRACE_NAME_MAX:
529 		case _SC_TRACE_SYS_MAX:
530 		case _SC_TRACE_USER_EVENT_MAX:
531 		case _SC_TYPED_MEMORY_OBJECTS:
532 			return (-1L);
533 	}
534 }
535 
536 /*
537  * UNIX 98 version of sysconf needed in order to set _XOPEN_VERSION to 500.
538  */
539 
540 long
__sysconf_xpg5(int name)541 __sysconf_xpg5(int name)
542 {
543 	switch (name) {
544 		default:
545 			return (sysconf(name));
546 		case _SC_XOPEN_VERSION:
547 			return (500L);
548 		case _SC_PASS_MAX:
549 			return ((long)_PASS_MAX_XPG);
550 	}
551 }
552