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1/*-
2 * Copyright (c) 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Sean Eric Fagan of Cygnus Support.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if defined(LIBC_SCCS) && !defined(lint)
34static char sccsid[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: lib/libc/gen/sysconf.c r168718 $");
38
39#include <sys/param.h>
40#include <sys/time.h>
41#include <sys/sysctl.h>
42#include <sys/resource.h>
43#include <sys/socket.h>
44#include <sys/aio.h>
45#include <sys/semaphore.h>
46
47#include <errno.h>
48#include <limits.h>
49#include <paths.h>
50#include <pthread.h> /* we just need the limits */
51#include <time.h>
52#include <unistd.h>
53
54#include "../../stdlib/FreeBSD/atexit.h"
55#include "../../stdtime/FreeBSD/tzfile.h"
56
57#define _PATH_ZONEINFO TZDIR /* from tzfile.h */
58
59/*
60 * sysconf --
61 * get configurable system variables.
62 *
63 * XXX
64 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
65 * not change during the lifetime of the calling process. This would seem
66 * to require that any change to system limits kill all running processes.
67 * A workaround might be to cache the values when they are first retrieved
68 * and then simply return the cached value on subsequent calls. This is
69 * less useful than returning up-to-date values, however.
70 */
71long
72sysconf(name)
73 int name;
74{
75 struct rlimit rl;
76 quad_t qdvalue; /* for kern.sysv.shmmin */
77 size_t len;
78 int mib[3], sverrno, value;
79 long lvalue, defaultresult;
80 const char *path;
81
82 defaultresult = -1;
83
84 switch (name) {
85 case _SC_ARG_MAX:
86 mib[0] = CTL_KERN;
87 mib[1] = KERN_ARGMAX;
88 break;
89 case _SC_CHILD_MAX:
90 if (getrlimit(RLIMIT_NPROC, &rl) != 0)
91 return (-1);
92 if (rl.rlim_cur == RLIM_INFINITY)
93 return (-1);
94 if (rl.rlim_cur > LONG_MAX) {
95 errno = EOVERFLOW;
96 return (-1);
97 }
98 return ((long)rl.rlim_cur);
99 case _SC_CLK_TCK:
100 return (CLK_TCK);
101 case _SC_NGROUPS_MAX:
102 mib[0] = CTL_KERN;
103 mib[1] = KERN_NGROUPS;
104 break;
105 case _SC_OPEN_MAX:
106 case _SC_STREAM_MAX: /* assume fds run out before memory does */
107 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
108 return (-1);
109 if (rl.rlim_cur == RLIM_INFINITY)
110 return (-1);
111 if (rl.rlim_cur > LONG_MAX) {
112 errno = EOVERFLOW;
113 return (-1);
114 }
115 return ((long)rl.rlim_cur);
116 case _SC_JOB_CONTROL:
117 return (_POSIX_JOB_CONTROL);
118 case _SC_SAVED_IDS:
119 /* XXX - must be 1 */
120 mib[0] = CTL_KERN;
121 mib[1] = KERN_SAVED_IDS;
122 goto yesno;
123 case _SC_VERSION:
124 mib[0] = CTL_KERN;
125 mib[1] = KERN_POSIX1;
126 break;
127 case _SC_BC_BASE_MAX:
128 return (BC_BASE_MAX);
129 case _SC_BC_DIM_MAX:
130 return (BC_DIM_MAX);
131 case _SC_BC_SCALE_MAX:
132 return (BC_SCALE_MAX);
133 case _SC_BC_STRING_MAX:
134 return (BC_STRING_MAX);
135 case _SC_COLL_WEIGHTS_MAX:
136 return (COLL_WEIGHTS_MAX);
137 case _SC_EXPR_NEST_MAX:
138 return (EXPR_NEST_MAX);
139 case _SC_LINE_MAX:
140 return (LINE_MAX);
141 case _SC_RE_DUP_MAX:
142 return (RE_DUP_MAX);
143 case _SC_2_VERSION:
144 /*
145 * This is something of a lie, but it would be silly at
146 * this point to try to deduce this from the contents
147 * of the filesystem.
148 */
149 return (_POSIX2_VERSION);
150 case _SC_2_C_BIND:
151 return (_POSIX2_C_BIND);
152 case _SC_2_C_DEV:
153 return (_POSIX2_C_DEV);
154 case _SC_2_CHAR_TERM:
155 return (_POSIX2_CHAR_TERM);
156 case _SC_2_FORT_DEV:
157 return (_POSIX2_FORT_DEV);
158 case _SC_2_FORT_RUN:
159 return (_POSIX2_FORT_RUN);
160 case _SC_2_LOCALEDEF:
161 return (_POSIX2_LOCALEDEF);
162 case _SC_2_SW_DEV:
163 return (_POSIX2_SW_DEV);
164 case _SC_2_UPE:
165 return (_POSIX2_UPE);
166 case _SC_TZNAME_MAX:
167 path = _PATH_ZONEINFO;
168do_NAME_MAX:
169 sverrno = errno;
170 errno = 0;
171 lvalue = pathconf(path, _PC_NAME_MAX);
172 if (lvalue == -1 && errno != 0)
173 return (-1);
174 errno = sverrno;
175 return (lvalue);
176
177 case _SC_ASYNCHRONOUS_IO:
178#if _POSIX_ASYNCHRONOUS_IO == 0
179 mib[0] = CTL_P1003_1B;
180 mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
181 break;
182#else
183 return (_POSIX_ASYNCHRONOUS_IO);
184#endif
185 case _SC_MAPPED_FILES:
186 return (_POSIX_MAPPED_FILES);
187 case _SC_MEMLOCK:
188 return (_POSIX_MEMLOCK);
189 case _SC_MEMLOCK_RANGE:
190 return (_POSIX_MEMLOCK_RANGE);
191 case _SC_MEMORY_PROTECTION:
192 return (_POSIX_MEMORY_PROTECTION);
193 case _SC_MESSAGE_PASSING:
194#if _POSIX_MESSAGE_PASSING == 0
195 mib[0] = CTL_P1003_1B;
196 mib[1] = CTL_P1003_1B_MESSAGE_PASSING;
197 goto yesno;
198#else
199 return (_POSIX_MESSAGE_PASSING);
200#endif
201 case _SC_PRIORITIZED_IO:
202#if _POSIX_PRIORITIZED_IO == 0
203 mib[0] = CTL_P1003_1B;
204 mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
205 goto yesno;
206#else
207 return (_POSIX_PRIORITIZED_IO);
208#endif
209 case _SC_PRIORITY_SCHEDULING:
210#if _POSIX_PRIORITY_SCHEDULING == 0
211 mib[0] = CTL_P1003_1B;
212 mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
213 goto yesno;
214#else
215 return (_POSIX_PRIORITY_SCHEDULING);
216#endif
217 case _SC_REALTIME_SIGNALS:
218#if _POSIX_REALTIME_SIGNALS == 0
219 mib[0] = CTL_P1003_1B;
220 mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
221 goto yesno;
222#else
223 return (_POSIX_REALTIME_SIGNALS);
224#endif
225 case _SC_SEMAPHORES:
226#if _POSIX_SEMAPHORES == 0
227 mib[0] = CTL_P1003_1B;
228 mib[1] = CTL_P1003_1B_SEMAPHORES;
229 goto yesno;
230#else
231 return (_POSIX_SEMAPHORES);
232#endif
233 case _SC_FSYNC:
234 return (_POSIX_FSYNC);
235
236 case _SC_SHARED_MEMORY_OBJECTS:
237 return (_POSIX_SHARED_MEMORY_OBJECTS);
238 case _SC_SYNCHRONIZED_IO:
239#if _POSIX_SYNCHRONIZED_IO == 0
240 mib[0] = CTL_P1003_1B;
241 mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
242 goto yesno;
243#else
244 return (_POSIX_SYNCHRONIZED_IO);
245#endif
246 case _SC_TIMERS:
247#if _POSIX_TIMERS == 0
248 mib[0] = CTL_P1003_1B;
249 mib[1] = CTL_P1003_1B_TIMERS;
250 goto yesno;
251#else
252 return (_POSIX_TIMERS);
253#endif
254 case _SC_AIO_LISTIO_MAX:
255#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_AIO_LISTIO_MAX)
256 mib[0] = CTL_P1003_1B;
257 mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
258#else
259 mib[0] = CTL_KERN;;
260 mib[1] = KERN_AIOMAX;
261#endif
262 break;
263 case _SC_AIO_MAX:
264#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_AIO_MAX)
265 mib[0] = CTL_P1003_1B;
266 mib[1] = CTL_P1003_1B_AIO_MAX;
267#else
268 mib[0] = CTL_KERN;;
269 mib[1] = KERN_AIOMAX;
270#endif
271 break;
272 case _SC_AIO_PRIO_DELTA_MAX:
273#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_AIO_PRIO_DELTA_MAX)
274 mib[0] = CTL_P1003_1B;
275 mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
276 break;
277#else
278 return (-1);
279#endif
280 case _SC_DELAYTIMER_MAX:
281#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_DELAYTIMER_MAX)
282 mib[0] = CTL_P1003_1B;
283 mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
284 goto yesno;
285#else
286 return (-1);
287#endif
288 case _SC_MQ_OPEN_MAX:
289#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_MQ_OPEN_MAX)
290 mib[0] = CTL_P1003_1B;
291 mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
292 goto yesno;
293#else
294 return (-1);
295#endif
296 case _SC_PAGESIZE:
297 defaultresult = getpagesize();
298#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_PAGESIZE)
299 mib[0] = CTL_P1003_1B;
300 mib[1] = CTL_P1003_1B_PAGESIZE;
301 goto yesno;
302#else
303 return defaultresult;
304#endif
305 case _SC_RTSIG_MAX:
306#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_RTSIG_MAX)
307 mib[0] = CTL_P1003_1B;
308 mib[1] = CTL_P1003_1B_RTSIG_MAX;
309 goto yesno;
310#else
311 return (-1);
312#endif
313 case _SC_SEM_NSEMS_MAX:
314#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_RTSIG_MAX)
315 mib[0] = CTL_P1003_1B;
316 mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX;
317 goto yesno;
318#else
319 len = sizeof(value);
320 return (sysctlbyname("kern.sysv.semmns", &value, &len, NULL, 0) == -1 ? -1 : value);
321#endif
322
323 case _SC_SEM_VALUE_MAX:
324#if SEM_VALUE_MAX == 0
325 mib[0] = CTL_P1003_1B;
326 mib[1] = CTL_P1003_1B_SEM_VALUE_MAX;
327 goto yesno;
328#else
329 return (SEM_VALUE_MAX);
330#endif
331 case _SC_SIGQUEUE_MAX:
332#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_SIGQUEUE_MAX)
333 mib[0] = CTL_P1003_1B;
334 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
335 goto yesno;
336#else
337 return (-1);
338#endif
339 case _SC_TIMER_MAX:
340#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_TIMER_MAX)
341 mib[0] = CTL_P1003_1B;
342 mib[1] = CTL_P1003_1B_TIMER_MAX;
343#else
344 return (-1);
345#endif
346
347yesno:
348 len = sizeof(value);
349 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
350 return (-1);
351 if (value == 0)
352 return (defaultresult);
353 return ((long)value);
354
355 case _SC_2_PBS:
356 case _SC_2_PBS_ACCOUNTING:
357 case _SC_2_PBS_CHECKPOINT:
358 case _SC_2_PBS_LOCATE:
359 case _SC_2_PBS_MESSAGE:
360 case _SC_2_PBS_TRACK:
361#if _POSIX2_PBS == 0
362#error "don't know how to determine _SC_2_PBS"
363 /*
364 * This probably requires digging through the filesystem
365 * to see if the appropriate package has been installed.
366 * Since we don't currently support this option at all,
367 * it's not worth the effort to write the code now.
368 * Figuring out which of the sub-options are supported
369 * would be even more difficult, so it's probably easier
370 * to always say ``no''.
371 */
372#else
373 return (_POSIX2_PBS);
374#endif
375 case _SC_ADVISORY_INFO:
376#if _POSIX_ADVISORY_INFO == 0
377#error "_POSIX_ADVISORY_INFO"
378#else
379 return (_POSIX_ADVISORY_INFO);
380#endif
381 case _SC_BARRIERS:
382#if _POSIX_BARRIERS == 0
383#error "_POSIX_BARRIERS"
384#else
385 return (_POSIX_BARRIERS);
386#endif
387 case _SC_CLOCK_SELECTION:
388#if _POSIX_CLOCK_SELECTION == 0
389#error "_POSIX_CLOCK_SELECTION"
390#else
391 return (_POSIX_CLOCK_SELECTION);
392#endif
393 case _SC_CPUTIME:
394#if _POSIX_CPUTIME == 0
395#error "_POSIX_CPUTIME"
396#else
397 return (_POSIX_CPUTIME);
398#endif
399 case _SC_FILE_LOCKING:
400 case _SC_GETGR_R_SIZE_MAX:
401/* return sizeof(group) + group_name_max + group_passwd_max + max_group_member*(MAXLOGNAME+1); */
402 return 4096; /* INT_MAX is too big for Perl */
403 case _SC_GETPW_R_SIZE_MAX:
404 return 4096;
405 case _SC_HOST_NAME_MAX:
406 return (MAXHOSTNAMELEN - 1); /* does not include \0 */
407 case _SC_LOGIN_NAME_MAX:
408 return (MAXLOGNAME);
409 case _SC_MONOTONIC_CLOCK:
410#if _POSIX_MONOTONIC_CLOCK == 0
411#error "_POSIX_MONOTONIC_CLOCK"
412#else
413 return (_POSIX_MONOTONIC_CLOCK);
414#endif
415 case _SC_MQ_PRIO_MAX:
416 return (-1);
417 case _SC_READER_WRITER_LOCKS:
418 return (_POSIX_READER_WRITER_LOCKS);
419 case _SC_REGEXP:
420 return (_POSIX_REGEXP);
421 case _SC_SHELL:
422 return (_POSIX_SHELL);
423 case _SC_SPAWN:
424 return (_POSIX_SPAWN);
425 case _SC_SPIN_LOCKS:
426 return (_POSIX_SPIN_LOCKS);
427 case _SC_SPORADIC_SERVER:
428#if _POSIX_SPORADIC_SERVER == 0
429#error "_POSIX_SPORADIC_SERVER"
430#else
431 return (_POSIX_SPORADIC_SERVER);
432#endif
433 case _SC_THREAD_ATTR_STACKADDR:
434 return (_POSIX_THREAD_ATTR_STACKADDR);
435 case _SC_THREAD_ATTR_STACKSIZE:
436 return (_POSIX_THREAD_ATTR_STACKSIZE);
437 case _SC_THREAD_CPUTIME:
438 return (_POSIX_THREAD_CPUTIME);
439 case _SC_THREAD_DESTRUCTOR_ITERATIONS:
440 return (PTHREAD_DESTRUCTOR_ITERATIONS);
441 case _SC_THREAD_KEYS_MAX:
442 return (PTHREAD_KEYS_MAX);
443 case _SC_THREAD_PRIO_INHERIT:
444 return (_POSIX_THREAD_PRIO_INHERIT);
445 case _SC_THREAD_PRIO_PROTECT:
446 return (_POSIX_THREAD_PRIO_PROTECT);
447 case _SC_THREAD_PRIORITY_SCHEDULING:
448 return (_POSIX_THREAD_PRIORITY_SCHEDULING);
449 case _SC_THREAD_PROCESS_SHARED:
450 return (_POSIX_THREAD_PROCESS_SHARED);
451 case _SC_THREAD_SAFE_FUNCTIONS:
452 return (_POSIX_THREAD_SAFE_FUNCTIONS);
453 case _SC_THREAD_SPORADIC_SERVER:
454 return (_POSIX_THREAD_SPORADIC_SERVER);
455 case _SC_THREAD_STACK_MIN:
456 return (PTHREAD_STACK_MIN);
457 case _SC_THREAD_THREADS_MAX:
458#ifdef PTHREAD_THREADS_MAX
459 return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
460#else
461 return (-1);
462#endif
463 case _SC_TIMEOUTS:
464 return (_POSIX_TIMEOUTS);
465 case _SC_THREADS:
466 return (_POSIX_THREADS);
467 case _SC_TRACE:
468#if _POSIX_TRACE == 0
469#error "_POSIX_TRACE"
470 /* While you're implementing this, also do the ones below. */
471#else
472 return (_POSIX_TRACE);
473#endif
474 case _SC_TRACE_EVENT_FILTER:
475 return (_POSIX_TRACE_EVENT_FILTER);
476 case _SC_TRACE_INHERIT:
477 return (_POSIX_TRACE_INHERIT);
478 case _SC_TRACE_LOG:
479 return (_POSIX_TRACE_LOG);
480 case _SC_TTY_NAME_MAX:
481 path = "/"; // should be _PATH_DEV (PR-3624562)
482 goto do_NAME_MAX;
483 case _SC_TYPED_MEMORY_OBJECTS:
484#if _POSIX_TYPED_MEMORY_OBJECTS == 0
485#error "_POSIX_TYPED_MEMORY_OBJECTS"
486#else
487 return (_POSIX_TYPED_MEMORY_OBJECTS);
488#endif
489 case _SC_V6_ILP32_OFF32:
490#if _V6_ILP32_OFF32 == 0
491 if (sizeof(int) * CHAR_BIT == 32 &&
492 sizeof(int) == sizeof(long) &&
493 sizeof(long) == sizeof(void *) &&
494 sizeof(void *) == sizeof(off_t))
495 return 1;
496 else
497 return -1;
498#else
499 return (_V6_ILP32_OFF32);
500#endif
501 case _SC_V6_ILP32_OFFBIG:
502#if _V6_ILP32_OFFBIG == 0
503 if (sizeof(int) * CHAR_BIT == 32 &&
504 sizeof(int) == sizeof(long) &&
505 sizeof(long) == sizeof(void *) &&
506 sizeof(off_t) * CHAR_BIT >= 64)
507 return 1;
508 else
509 return -1;
510#else
511 return (_V6_ILP32_OFFBIG);
512#endif
513 case _SC_V6_LP64_OFF64:
514#if _V6_LP64_OFF64 == 0
515 if (sizeof(int) * CHAR_BIT == 32 &&
516 sizeof(long) * CHAR_BIT == 64 &&
517 sizeof(long) == sizeof(void *) &&
518 sizeof(void *) == sizeof(off_t))
519 return 1;
520 else
521 return -1;
522#else
523 return (_V6_LP64_OFF64);
524#endif
525 case _SC_V6_LPBIG_OFFBIG:
526#if _V6_LPBIG_OFFBIG == 0
527 if (sizeof(int) * CHAR_BIT >= 32 &&
528 sizeof(long) * CHAR_BIT >= 64 &&
529 sizeof(void *) * CHAR_BIT >= 64 &&
530 sizeof(off_t) * CHAR_BIT >= 64)
531 return 1;
532 else
533 return -1;
534#else
535 return (_V6_LPBIG_OFFBIG);
536#endif
537 case _SC_ATEXIT_MAX:
538 return (INT_MAX); /* unlimited */
539 case _SC_IOV_MAX:
540#ifdef KERN_IOV_MAX
541 mib[0] = CTL_KERN;
542 mib[1] = KERN_IOV_MAX;
543 break;
544#else
545 return (IOV_MAX);
546#endif
547 case _SC_XOPEN_CRYPT:
548 return (_XOPEN_CRYPT);
549 case _SC_XOPEN_ENH_I18N:
550 return (_XOPEN_ENH_I18N);
551 case _SC_XOPEN_LEGACY:
552 return (_XOPEN_LEGACY);
553 case _SC_XOPEN_REALTIME:
554#if _XOPEN_REALTIME == 0
555 sverrno = errno;
556 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
557 sysconf(_SC_MEMLOCK) > 0 &&
558 sysconf(_SC_MEMLOCK_RANGE) > 0 &&
559 sysconf(_SC_MESSAGE_PASSING) > 0 &&
560 sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
561 sysconf(_SC_REALTIME_SIGNALS) > 0 &&
562 sysconf(_SC_SEMAPHORES) > 0 &&
563 sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
564 sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
565 sysconf(_SC_TIMERS) > 0;
566 errno = sverrno;
567 if (value)
568 return (200112L);
569 else
570 return (-1);
571#else
572 return (_XOPEN_REALTIME);
573#endif
574 case _SC_XOPEN_REALTIME_THREADS:
575#if _XOPEN_REALTIME_THREADS == 0
576#error "_XOPEN_REALTIME_THREADS"
577#else
578 return (_XOPEN_REALTIME_THREADS);
579#endif
580 case _SC_XOPEN_SHM:
581 sverrno = errno;
582 len = sizeof(qdvalue);
583 if (sysctlbyname("kern.sysv.shmmin", &qdvalue, &len, NULL,
584 0) == -1) {
585 errno = sverrno;
586 return (-1);
587 }
588 errno = sverrno;
589 return (1);
590 case _SC_XOPEN_STREAMS:
591 return (_XOPEN_STREAMS);
592 case _SC_XOPEN_UNIX:
593 return (_XOPEN_UNIX);
594#ifdef _XOPEN_VERSION
595 case _SC_XOPEN_VERSION:
596 return (_XOPEN_VERSION);
597#endif
598#ifdef _XOPEN_XCU_VERSION
599 case _SC_XOPEN_XCU_VERSION:
600 return (_XOPEN_XCU_VERSION);
601#endif
602 case _SC_SYMLOOP_MAX:
603 return (MAXSYMLINKS);
604 case _SC_RAW_SOCKETS:
605 return (_POSIX_RAW_SOCKETS);
606 case _SC_IPV6:
607#if _POSIX_IPV6 == 0
608 sverrno = errno;
609 value = socket(PF_INET6, SOCK_DGRAM, 0);
610 errno = sverrno;
611 if (value >= 0) {
612 close(value);
613 return (200112L);
614 } else
615 return (0);
616#else
617 return (_POSIX_IPV6);
618#endif
619
620#ifdef _SC_NPROCESSORS_CONF
621 case _SC_NPROCESSORS_CONF:
622#endif
623#ifdef _SC_NPROCESSORS_ONLN
624 case _SC_NPROCESSORS_ONLN:
625#endif
626#if defined(_SC_NPROCESSORS_CONF) || defined(_SC_NPROCESSORS_ONLN)
627 mib[0] = CTL_HW;
628 mib[1] = HW_NCPU;
629 break;
630#endif
631 case _SC_XBS5_ILP32_OFF32:
632 return (_XBS5_ILP32_OFF32);
633 case _SC_XBS5_ILP32_OFFBIG:
634 return (_XBS5_ILP32_OFFBIG);
635 case _SC_XBS5_LP64_OFF64:
636 return (_XBS5_LP64_OFF64);
637 case _SC_XBS5_LPBIG_OFFBIG:
638 return (_XBS5_LPBIG_OFFBIG);
639 case _SC_SS_REPL_MAX:
640 return (_POSIX_SS_REPL_MAX);
641 case _SC_TRACE_EVENT_NAME_MAX:
642 return (_POSIX_TRACE_EVENT_NAME_MAX);
643 case _SC_TRACE_NAME_MAX:
644 return (_POSIX_TRACE_NAME_MAX);
645 case _SC_TRACE_SYS_MAX:
646 return (_POSIX_TRACE_SYS_MAX);
647 case _SC_TRACE_USER_EVENT_MAX:
648 return (_POSIX_TRACE_USER_EVENT_MAX);
649 case _SC_PASS_MAX:
650 return (PASS_MAX);
651
652#ifdef _SC_PHYS_PAGES
653 case _SC_PHYS_PAGES:
654#ifdef __APPLE__
655 {
656 long memsize;
657 long pagesize;
658
659 len = sizeof(memsize);
660 if (sysctlbyname("hw.memsize", &memsize, &len, NULL, 0) == -1)
661 return (-1);
662
663 len = sizeof(pagesize);
664 if (sysctlbyname("hw.pagesize", &pagesize, &len, NULL, 0) == -1)
665 return (-1);
666
667 return (memsize / pagesize);
668 }
669#else
670 len = sizeof(lvalue);
671 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
672 return (-1);
673 return (lvalue);
674#endif
675#endif
676
677 default:
678 errno = EINVAL;
679 return (-1);
680 }
681 len = sizeof(value);
682 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
683 value = -1;
684 return ((long)value);
685}
mirror of libc