[apple/libc.git] / gen / sysconf-fbsd.c

/*-
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Sean Eric Fagan of Cygnus Support.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)sysconf.c	8.2 (Berkeley) 3/20/94";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/gen/sysconf.c,v 1.20 2002/11/17 08:54:29 dougb Exp $");

#include <sys/param.h>
#include <sys/time.h>
#include <sys/sysctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/aio.h>
#include <sys/semaphore.h>

#include <errno.h>
#include <limits.h>
#include <paths.h>
#include <pthread.h>		/* we just need the limits */
#include <time.h>
#include <unistd.h>

#include "../stdlib/atexit.h"
#include "../stdtime/tzfile.h"

#define	_PATH_ZONEINFO	TZDIR	/* from tzfile.h */

/*
 * sysconf --
 *	get configurable system variables.
 *
 * XXX
 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
 * not change during the lifetime of the calling process.  This would seem
 * to require that any change to system limits kill all running processes.
 * A workaround might be to cache the values when they are first retrieved
 * and then simply return the cached value on subsequent calls.  This is
 * less useful than returning up-to-date values, however.
 */
long
sysconf(name)
	int name;
{
	struct rlimit rl;
	quad_t qdvalue;	/* for kern.sysv.shmmin */
	size_t len;
	int mib[3], sverrno, value;
	long defaultresult;
	const char *path;

	len = sizeof(value);
	defaultresult = -1;

	switch (name) {
	case _SC_ARG_MAX:
		mib[0] = CTL_KERN;
		mib[1] = KERN_ARGMAX;
		break;
	case _SC_CHILD_MAX:
		if (getrlimit(RLIMIT_NPROC, &rl) != 0)
			return (-1);
		if (rl.rlim_cur == RLIM_INFINITY)
			return (-1);
		if (rl.rlim_cur > LONG_MAX) {
			errno = EOVERFLOW;
			return (-1);
		}
		return ((long)rl.rlim_cur);
	case _SC_CLK_TCK:
		return (CLK_TCK);
	case _SC_NGROUPS_MAX:
		mib[0] = CTL_KERN;
		mib[1] = KERN_NGROUPS;
		break;
	case _SC_OPEN_MAX:
	case _SC_STREAM_MAX:	/* assume fds run out before memory does */
		if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
			return (-1);
		if (rl.rlim_cur == RLIM_INFINITY)
			return (-1);
		if (rl.rlim_cur > LONG_MAX) {
			errno = EOVERFLOW;
			return (-1);
		}
		return ((long)rl.rlim_cur);
	case _SC_JOB_CONTROL:
		return (_POSIX_JOB_CONTROL);
	case _SC_SAVED_IDS:
		/* XXX - must be 1 */
		mib[0] = CTL_KERN;
		mib[1] = KERN_SAVED_IDS;
		goto yesno;
	case _SC_VERSION:
		mib[0] = CTL_KERN;
		mib[1] = KERN_POSIX1;
		break;
	case _SC_BC_BASE_MAX:
		return (BC_BASE_MAX);
	case _SC_BC_DIM_MAX:
		return (BC_DIM_MAX);
	case _SC_BC_SCALE_MAX:
		return (BC_SCALE_MAX);
	case _SC_BC_STRING_MAX:
		return (BC_STRING_MAX);
	case _SC_COLL_WEIGHTS_MAX:
		return (COLL_WEIGHTS_MAX);
	case _SC_EXPR_NEST_MAX:
		return (EXPR_NEST_MAX);
	case _SC_LINE_MAX:
		return (LINE_MAX);
	case _SC_RE_DUP_MAX:
		return (RE_DUP_MAX);
	case _SC_2_VERSION:
		/*
		 * This is something of a lie, but it would be silly at
		 * this point to try to deduce this from the contents
		 * of the filesystem.
		 */
		return (_POSIX2_VERSION);
	case _SC_2_C_BIND:
		return (_POSIX2_C_BIND);
	case _SC_2_C_DEV:
		return (_POSIX2_C_DEV);
	case _SC_2_CHAR_TERM:
		return (_POSIX2_CHAR_TERM);
	case _SC_2_FORT_DEV:
		return (_POSIX2_FORT_DEV);
	case _SC_2_FORT_RUN:
		return (_POSIX2_FORT_RUN);
	case _SC_2_LOCALEDEF:
		return (_POSIX2_LOCALEDEF);
	case _SC_2_SW_DEV:
		return (_POSIX2_SW_DEV);
	case _SC_2_UPE:
		return (_POSIX2_UPE);
	case _SC_TZNAME_MAX:
		path = _PATH_ZONEINFO;
do_NAME_MAX:
		sverrno = errno;
		errno = 0;
		value = pathconf(path, _PC_NAME_MAX);
		if (value == -1 && errno != 0)
			return (-1);
		errno = sverrno;
		return (value);

	case _SC_ASYNCHRONOUS_IO:
#if _POSIX_ASYNCHRONOUS_IO == 0
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
		break;
#else
		return (_POSIX_ASYNCHRONOUS_IO);
#endif
	case _SC_MAPPED_FILES:
		return (_POSIX_MAPPED_FILES);
	case _SC_MEMLOCK:
		return (_POSIX_MEMLOCK);
	case _SC_MEMLOCK_RANGE:
		return (_POSIX_MEMLOCK_RANGE);
	case _SC_MEMORY_PROTECTION:
		return (_POSIX_MEMORY_PROTECTION);
	case _SC_MESSAGE_PASSING:
#if _POSIX_MESSAGE_PASSING == 0
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_MESSAGE_PASSING;
		goto yesno;
#else
		return (_POSIX_MESSAGE_PASSING);
#endif
	case _SC_PRIORITIZED_IO:
#if _POSIX_PRIORITIZED_IO == 0
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
		goto yesno;
#else
		return (_POSIX_PRIORITIZED_IO);
#endif
	case _SC_PRIORITY_SCHEDULING:
#if _POSIX_PRIORITY_SCHEDULING == 0
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
		goto yesno;
#else
		return (_POSIX_PRIORITY_SCHEDULING);
#endif
	case _SC_REALTIME_SIGNALS:
#if _POSIX_REALTIME_SIGNALS == 0
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
		goto yesno;
#else
		return (_POSIX_REALTIME_SIGNALS);
#endif
	case _SC_SEMAPHORES:
#if _POSIX_SEMAPHORES == 0
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_SEMAPHORES;
		goto yesno;
#else
		return (_POSIX_SEMAPHORES);
#endif
	case _SC_FSYNC:
		return (_POSIX_FSYNC);

	case _SC_SHARED_MEMORY_OBJECTS:
		return (_POSIX_SHARED_MEMORY_OBJECTS);
	case _SC_SYNCHRONIZED_IO:
#if _POSIX_SYNCHRONIZED_IO == 0
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
		goto yesno;
#else
		return (_POSIX_SYNCHRONIZED_IO);
#endif
	case _SC_TIMERS:
#if _POSIX_TIMERS == 0
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_TIMERS;
		goto yesno;
#else
		return (_POSIX_TIMERS);
#endif
	case _SC_AIO_LISTIO_MAX:
	case _SC_AIO_MAX:
		mib[0] = CTL_KERN;;
		mib[1] = KERN_AIOMAX;
		break;

	case _SC_AIO_PRIO_DELTA_MAX:
#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_AIO_PRIO_DELTA_MAX)
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
		break;
#else
		return (-1);
#endif
	case _SC_DELAYTIMER_MAX:
#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_DELAYTIMER_MAX)
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
		goto yesno;
#else
		return (-1);
#endif
	case _SC_MQ_OPEN_MAX:
#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_MQ_OPEN_MAX)
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
		goto yesno;
#else
		return (-1);
#endif
	case _SC_PAGESIZE:
		defaultresult = getpagesize();
#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_PAGESIZE)
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_PAGESIZE;
		goto yesno;
#else
		return defaultresult;
#endif
	case _SC_RTSIG_MAX:
#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_RTSIG_MAX)
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_RTSIG_MAX;
		goto yesno;
#else
		return (-1);
#endif
	case _SC_SEM_NSEMS_MAX:
		return (sysctlbyname("kern.sysv.semmns", &value, &len, NULL, 0) == -1 ? -1 : value);

	case _SC_SEM_VALUE_MAX:
#if SEM_VALUE_MAX == 0
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_SEM_VALUE_MAX;
		goto yesno;
#else
		return (SEM_VALUE_MAX);
#endif
	case _SC_SIGQUEUE_MAX:
#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_SIGQUEUE_MAX)
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
		goto yesno;
#else
		return (-1);
#endif
	case _SC_TIMER_MAX:
#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_TIMER_MAX)
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_TIMER_MAX;
#else
		return (-1);
#endif

yesno:		if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
			return (-1);
		if (value == 0)
			return (defaultresult);
		return (value);
	case _SC_2_PBS:
	case _SC_2_PBS_ACCOUNTING:
	case _SC_2_PBS_CHECKPOINT:
	case _SC_2_PBS_LOCATE:
	case _SC_2_PBS_MESSAGE:
	case _SC_2_PBS_TRACK:
		return -1;
	case _SC_ADVISORY_INFO:
#if _POSIX_ADVISORY_INFO == 0
#error "_POSIX_ADVISORY_INFO"
#else
		return (_POSIX_ADVISORY_INFO);
#endif
	case _SC_BARRIERS:
#if _POSIX_BARRIERS == 0
#error "_POSIX_BARRIERS"
#else
		return (_POSIX_BARRIERS);
#endif
	case _SC_CLOCK_SELECTION:
#if _POSIX_CLOCK_SELECTION == 0
#error "_POSIX_CLOCK_SELECTION"
#else
		return (_POSIX_CLOCK_SELECTION);
#endif
	case _SC_CPUTIME:
#if _POSIX_CPUTIME == 0
#error "_POSIX_CPUTIME"
#else
		return (_POSIX_CPUTIME);
#endif
	case _SC_FILE_LOCKING:
	case _SC_GETGR_R_SIZE_MAX:
/*		return sizeof(group) + group_name_max + group_passwd_max + max_group_member*(MAXLOGNAME+1); */
		return 4096;	/* INT_MAX is too big for Perl */
	case _SC_GETPW_R_SIZE_MAX:
		return 4096;
	case _SC_HOST_NAME_MAX:
		return (MAXHOSTNAMELEN - 1); /* does not include \0 */
	case _SC_LOGIN_NAME_MAX:
		return (MAXLOGNAME);
	case _SC_MONOTONIC_CLOCK:
#if _POSIX_MONOTONIC_CLOCK == 0
#error "_POSIX_MONOTONIC_CLOCK"
#else
		return (_POSIX_MONOTONIC_CLOCK);
#endif
	case _SC_MQ_PRIO_MAX:
		return (-1);
	case _SC_READER_WRITER_LOCKS:
		return (_POSIX_READER_WRITER_LOCKS);
	case _SC_REGEXP:
		return (_POSIX_REGEXP);
	case _SC_SHELL:
		return (_POSIX_SHELL);
	case _SC_SPAWN:
		return (_POSIX_SPAWN);
	case _SC_SPIN_LOCKS:
		return (_POSIX_SPIN_LOCKS);
	case _SC_SPORADIC_SERVER:
#if _POSIX_SPORADIC_SERVER == 0
#error "_POSIX_SPORADIC_SERVER"
#else
		return (_POSIX_SPORADIC_SERVER);
#endif
	case _SC_THREAD_ATTR_STACKADDR:
		return (_POSIX_THREAD_ATTR_STACKADDR);
	case _SC_THREAD_ATTR_STACKSIZE:
		return (_POSIX_THREAD_ATTR_STACKSIZE);
	case _SC_THREAD_CPUTIME:
		return (_POSIX_THREAD_CPUTIME);
	case _SC_THREAD_DESTRUCTOR_ITERATIONS:
		return (PTHREAD_DESTRUCTOR_ITERATIONS);
	case _SC_THREAD_KEYS_MAX:
		return (PTHREAD_KEYS_MAX);
	case _SC_THREAD_PRIO_INHERIT:
		return (_POSIX_THREAD_PRIO_INHERIT);
	case _SC_THREAD_PRIO_PROTECT:
		return (_POSIX_THREAD_PRIO_PROTECT);
	case _SC_THREAD_PRIORITY_SCHEDULING:
		return (_POSIX_THREAD_PRIORITY_SCHEDULING);
	case _SC_THREAD_PROCESS_SHARED:
		return (_POSIX_THREAD_PROCESS_SHARED);
	case _SC_THREAD_SAFE_FUNCTIONS:
		return (_POSIX_THREAD_SAFE_FUNCTIONS);
	case _SC_THREAD_SPORADIC_SERVER:
		return (_POSIX_THREAD_SPORADIC_SERVER);
	case _SC_THREAD_STACK_MIN:
		return (PTHREAD_STACK_MIN);
	case _SC_THREAD_THREADS_MAX:
#ifdef PTHREAD_THREADS_MAX
		return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
#else
		return (-1);
#endif
	case _SC_TIMEOUTS:
		return (_POSIX_TIMEOUTS);
	case _SC_THREADS:
		return (_POSIX_THREADS);
	case _SC_TRACE:
#if _POSIX_TRACE == 0
#error "_POSIX_TRACE"
		/* While you're implementing this, also do the ones below. */
#else
		return (_POSIX_TRACE);
#endif
	case _SC_TRACE_EVENT_FILTER:
		return (_POSIX_TRACE_EVENT_FILTER);
	case _SC_TRACE_INHERIT:
		return (_POSIX_TRACE_INHERIT);
	case _SC_TRACE_LOG:
		return (_POSIX_TRACE_LOG);
	case _SC_TTY_NAME_MAX:
		path = "/"; // should be _PATH_DEV (PR-3624562)
		goto do_NAME_MAX;
	case _SC_TYPED_MEMORY_OBJECTS:
#if _POSIX_TYPED_MEMORY_OBJECTS == 0
#error "_POSIX_TYPED_MEMORY_OBJECTS"
#else
		return (_POSIX_TYPED_MEMORY_OBJECTS);
#endif
	case _SC_V6_ILP32_OFF32:
#if _V6_ILP32_OFF32 == 0
		if (sizeof(int) * CHAR_BIT == 32 &&
		    sizeof(int) == sizeof(long) &&
		    sizeof(long) == sizeof(void *) &&
		    sizeof(void *) == sizeof(off_t))
			return 1;
		else
			return -1;
#else
		return (_V6_ILP32_OFF32);
#endif
	case _SC_V6_ILP32_OFFBIG:
#if _V6_ILP32_OFFBIG == 0
		if (sizeof(int) * CHAR_BIT == 32 &&
		    sizeof(int) == sizeof(long) &&
		    sizeof(long) == sizeof(void *) &&
		    sizeof(off_t) * CHAR_BIT >= 64)
			return 1;
		else
			return -1;
#else
		return (_V6_ILP32_OFFBIG);
#endif
	case _SC_V6_LP64_OFF64:
#if _V6_LP64_OFF64 == 0
		if (sizeof(int) * CHAR_BIT == 32 &&
		    sizeof(long) * CHAR_BIT == 64 &&
		    sizeof(long) == sizeof(void *) &&
		    sizeof(void *) == sizeof(off_t))
			return 1;
		else
			return -1;
#else
		return (_V6_LP64_OFF64);
#endif
	case _SC_V6_LPBIG_OFFBIG:
#if _V6_LPBIG_OFFBIG == 0
		if (sizeof(int) * CHAR_BIT >= 32 &&
		    sizeof(long) * CHAR_BIT >= 64 &&
		    sizeof(void *) * CHAR_BIT >= 64 &&
		    sizeof(off_t) * CHAR_BIT >= 64)
			return 1;
		else
			return -1;
#else
		return (_V6_LPBIG_OFFBIG);
#endif
	case _SC_ATEXIT_MAX:
		return (INT_MAX);	/* unlimited */
	case _SC_IOV_MAX:
#ifdef KERN_IOV_MAX
		mib[0] = CTL_KERN;
		mib[1] = KERN_IOV_MAX;
		break;
#else
		return (IOV_MAX);
#endif
	case _SC_XOPEN_CRYPT:
		return (_XOPEN_CRYPT);
	case _SC_XOPEN_ENH_I18N:
		return (_XOPEN_ENH_I18N);
	case _SC_XOPEN_LEGACY:
		return (_XOPEN_LEGACY);
	case _SC_XOPEN_REALTIME:
#if _XOPEN_REALTIME == 0
		sverrno = errno;
		value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
			sysconf(_SC_MEMLOCK) > 0 &&
			sysconf(_SC_MEMLOCK_RANGE) > 0 &&
			sysconf(_SC_MESSAGE_PASSING) > 0 &&
			sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
			sysconf(_SC_REALTIME_SIGNALS) > 0 &&
			sysconf(_SC_SEMAPHORES) > 0 &&
			sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
			sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
			sysconf(_SC_TIMERS) > 0;
		errno = sverrno;
		if (value)
			return (200112L);
		else
			return (-1);
#else
		return (_XOPEN_REALTIME);
#endif
	case _SC_XOPEN_REALTIME_THREADS:
#if _XOPEN_REALTIME_THREADS == 0
#error "_XOPEN_REALTIME_THREADS"
#else
		return (_XOPEN_REALTIME_THREADS);
#endif
	case _SC_XOPEN_SHM:
		sverrno = errno;
		len = sizeof(qdvalue);
		if (sysctlbyname("kern.sysv.shmmin", &qdvalue, &len, NULL, 
		    0) == -1) {
			errno = sverrno;
			return (-1);
		}
		errno = sverrno;
		return (1);
	case _SC_XOPEN_STREAMS:
		return (_XOPEN_STREAMS);
	case _SC_XOPEN_UNIX:
		return (_XOPEN_UNIX);
#ifdef _XOPEN_VERSION
	case _SC_XOPEN_VERSION:
		return (_XOPEN_VERSION);
#endif
#ifdef _XOPEN_XCU_VERSION
	case _SC_XOPEN_XCU_VERSION:
		return (_XOPEN_XCU_VERSION);
#endif
	case _SC_SYMLOOP_MAX:
		return (MAXSYMLINKS);
	case _SC_RAW_SOCKETS:
		return (_POSIX_RAW_SOCKETS);
	case _SC_IPV6:
#if _POSIX_IPV6 == 0
		sverrno = errno;
		value = socket(PF_INET6, SOCK_DGRAM, 0);
		errno = sverrno;
		if (value >= 0) {
			close(value);
			return (200112L);
		} else
			return (0);
#else
		return (_POSIX_IPV6);
#endif

#ifdef _SC_NPROCESSORS_CONF
	case _SC_NPROCESSORS_CONF:
#endif
#ifdef _SC_NPROCESSORS_ONLN
	case _SC_NPROCESSORS_ONLN:
#endif
#if defined(_SC_NPROCESSORS_CONF) || defined(_SC_NPROCESSORS_ONLN)
		mib[0] = CTL_HW;
		mib[1] = HW_NCPU;
		break;
#endif
	case _SC_XBS5_ILP32_OFF32:
		return (_XBS5_ILP32_OFF32);
	case _SC_XBS5_ILP32_OFFBIG:
		return (_XBS5_ILP32_OFFBIG);
	case _SC_XBS5_LP64_OFF64:
		return (_XBS5_LP64_OFF64);
	case _SC_XBS5_LPBIG_OFFBIG:
		return (_XBS5_LPBIG_OFFBIG);
	case _SC_SS_REPL_MAX:
		return (_POSIX_SS_REPL_MAX);
	case _SC_TRACE_EVENT_NAME_MAX:
		return (_POSIX_TRACE_EVENT_NAME_MAX);
	case _SC_TRACE_NAME_MAX:
		return (_POSIX_TRACE_NAME_MAX);
	case _SC_TRACE_SYS_MAX:
		return (_POSIX_TRACE_SYS_MAX);
	case _SC_TRACE_USER_EVENT_MAX:
		return (_POSIX_TRACE_USER_EVENT_MAX);
	case _SC_PASS_MAX:
		return (PASS_MAX);

	default:
		errno = EINVAL;
		return (-1);
	}
	return (sysctl(mib, 2, &value, &len, NULL, 0) == -1 ? -1 : value);
}
Commit	Line	Data
224c7076 A	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	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the University of
	19	* California, Berkeley and its contributors.
	20	* 4. Neither the name of the University nor the names of its contributors
	21	* may be used to endorse or promote products derived from this software
	22	* without specific prior written permission.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	* SUCH DAMAGE.
	35	*/
	36
	37	#if defined(LIBC_SCCS) && !defined(lint)
	38	static char sccsid[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94";
	39	#endif /* LIBC_SCCS and not lint */
	40	#include <sys/cdefs.h>
	41	__FBSDID("$FreeBSD: src/lib/libc/gen/sysconf.c,v 1.20 2002/11/17 08:54:29 dougb Exp $");
	42
	43	#include <sys/param.h>
	44	#include <sys/time.h>
	45	#include <sys/sysctl.h>
	46	#include <sys/resource.h>
	47	#include <sys/socket.h>
	48	#include <sys/aio.h>
	49	#include <sys/semaphore.h>
	50
	51	#include <errno.h>
	52	#include <limits.h>
	53	#include <paths.h>
	54	#include <pthread.h> /* we just need the limits */
	55	#include <time.h>
	56	#include <unistd.h>
	57
	58	#include "../stdlib/atexit.h"
	59	#include "../stdtime/tzfile.h"
	60
	61	#define _PATH_ZONEINFO TZDIR /* from tzfile.h */
	62
	63	/*
	64	* sysconf --
65	* get configurable system variables.
66	*
67	* XXX
68	* POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
69	* not change during the lifetime of the calling process. This would seem
70	* to require that any change to system limits kill all running processes.
71	* A workaround might be to cache the values when they are first retrieved
72	* and then simply return the cached value on subsequent calls. This is
73	* less useful than returning up-to-date values, however.
74	*/
75	long
76	sysconf(name)
77	int name;
78	{
79	struct rlimit rl;
80	quad_t qdvalue; /* for kern.sysv.shmmin */
81	size_t len;
82	int mib[3], sverrno, value;
83	long defaultresult;
84	const char *path;
85
86	len = sizeof(value);
87	defaultresult = -1;
88
89	switch (name) {
90	case _SC_ARG_MAX:
91	mib[0] = CTL_KERN;
92	mib[1] = KERN_ARGMAX;
93	break;
94	case _SC_CHILD_MAX:
95	if (getrlimit(RLIMIT_NPROC, &rl) != 0)
96	return (-1);
97	if (rl.rlim_cur == RLIM_INFINITY)
98	return (-1);
99	if (rl.rlim_cur > LONG_MAX) {
100	errno = EOVERFLOW;
101	return (-1);
102	}
103	return ((long)rl.rlim_cur);
104	case _SC_CLK_TCK:
105	return (CLK_TCK);
106	case _SC_NGROUPS_MAX:
107	mib[0] = CTL_KERN;
108	mib[1] = KERN_NGROUPS;
109	break;
110	case _SC_OPEN_MAX:
111	case _SC_STREAM_MAX: /* assume fds run out before memory does */
112	if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
113	return (-1);
114	if (rl.rlim_cur == RLIM_INFINITY)
115	return (-1);
116	if (rl.rlim_cur > LONG_MAX) {
117	errno = EOVERFLOW;
118	return (-1);
119	}
120	return ((long)rl.rlim_cur);
121	case _SC_JOB_CONTROL:
122	return (_POSIX_JOB_CONTROL);
123	case _SC_SAVED_IDS:
124	/* XXX - must be 1 */
125	mib[0] = CTL_KERN;
126	mib[1] = KERN_SAVED_IDS;
127	goto yesno;
128	case _SC_VERSION:
129	mib[0] = CTL_KERN;
130	mib[1] = KERN_POSIX1;
131	break;
132	case _SC_BC_BASE_MAX:
133	return (BC_BASE_MAX);
134	case _SC_BC_DIM_MAX:
135	return (BC_DIM_MAX);
136	case _SC_BC_SCALE_MAX:
137	return (BC_SCALE_MAX);
138	case _SC_BC_STRING_MAX:
139	return (BC_STRING_MAX);
140	case _SC_COLL_WEIGHTS_MAX:
141	return (COLL_WEIGHTS_MAX);
142	case _SC_EXPR_NEST_MAX:
143	return (EXPR_NEST_MAX);
144	case _SC_LINE_MAX:
145	return (LINE_MAX);
146	case _SC_RE_DUP_MAX:
147	return (RE_DUP_MAX);
148	case _SC_2_VERSION:
149	/*
150	* This is something of a lie, but it would be silly at
151	* this point to try to deduce this from the contents
152	* of the filesystem.
153	*/
154	return (_POSIX2_VERSION);
155	case _SC_2_C_BIND:
156	return (_POSIX2_C_BIND);
157	case _SC_2_C_DEV:
158	return (_POSIX2_C_DEV);
159	case _SC_2_CHAR_TERM:
160	return (_POSIX2_CHAR_TERM);
161	case _SC_2_FORT_DEV:
162	return (_POSIX2_FORT_DEV);
163	case _SC_2_FORT_RUN:
164	return (_POSIX2_FORT_RUN);
165	case _SC_2_LOCALEDEF:
166	return (_POSIX2_LOCALEDEF);
167	case _SC_2_SW_DEV:
168	return (_POSIX2_SW_DEV);
169	case _SC_2_UPE:
170	return (_POSIX2_UPE);
171	case _SC_TZNAME_MAX:
172	path = _PATH_ZONEINFO;
173	do_NAME_MAX:
174	sverrno = errno;
175	errno = 0;
176	value = pathconf(path, _PC_NAME_MAX);
177	if (value == -1 && errno != 0)
178	return (-1);
179	errno = sverrno;
180	return (value);
181
182	case _SC_ASYNCHRONOUS_IO:
183	#if _POSIX_ASYNCHRONOUS_IO == 0
184	mib[0] = CTL_P1003_1B;
185	mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
186	break;
187	#else
188	return (_POSIX_ASYNCHRONOUS_IO);
189	#endif
190	case _SC_MAPPED_FILES:
191	return (_POSIX_MAPPED_FILES);
192	case _SC_MEMLOCK:
193	return (_POSIX_MEMLOCK);
194	case _SC_MEMLOCK_RANGE:
195	return (_POSIX_MEMLOCK_RANGE);
196	case _SC_MEMORY_PROTECTION:
197	return (_POSIX_MEMORY_PROTECTION);
198	case _SC_MESSAGE_PASSING:
199	#if _POSIX_MESSAGE_PASSING == 0
200	mib[0] = CTL_P1003_1B;
201	mib[1] = CTL_P1003_1B_MESSAGE_PASSING;
202	goto yesno;
203	#else
204	return (_POSIX_MESSAGE_PASSING);
205	#endif
206	case _SC_PRIORITIZED_IO:
207	#if _POSIX_PRIORITIZED_IO == 0
208	mib[0] = CTL_P1003_1B;
209	mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
210	goto yesno;
211	#else
212	return (_POSIX_PRIORITIZED_IO);
213	#endif
214	case _SC_PRIORITY_SCHEDULING:
215	#if _POSIX_PRIORITY_SCHEDULING == 0
216	mib[0] = CTL_P1003_1B;
217	mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
218	goto yesno;
219	#else
220	return (_POSIX_PRIORITY_SCHEDULING);
221	#endif
222	case _SC_REALTIME_SIGNALS:
223	#if _POSIX_REALTIME_SIGNALS == 0
224	mib[0] = CTL_P1003_1B;
225	mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
226	goto yesno;
227	#else
228	return (_POSIX_REALTIME_SIGNALS);
229	#endif
230	case _SC_SEMAPHORES:
231	#if _POSIX_SEMAPHORES == 0
232	mib[0] = CTL_P1003_1B;
233	mib[1] = CTL_P1003_1B_SEMAPHORES;
234	goto yesno;
235	#else
236	return (_POSIX_SEMAPHORES);
237	#endif
238	case _SC_FSYNC:
239	return (_POSIX_FSYNC);
240
241	case _SC_SHARED_MEMORY_OBJECTS:
242	return (_POSIX_SHARED_MEMORY_OBJECTS);
243	case _SC_SYNCHRONIZED_IO:
244	#if _POSIX_SYNCHRONIZED_IO == 0
245	mib[0] = CTL_P1003_1B;
246	mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
247	goto yesno;
248	#else
249	return (_POSIX_SYNCHRONIZED_IO);
250	#endif
251	case _SC_TIMERS:
252	#if _POSIX_TIMERS == 0
253	mib[0] = CTL_P1003_1B;
254	mib[1] = CTL_P1003_1B_TIMERS;
255	goto yesno;
256	#else
257	return (_POSIX_TIMERS);
258	#endif
259	case _SC_AIO_LISTIO_MAX:
260	case _SC_AIO_MAX:
261	mib[0] = CTL_KERN;;
262	mib[1] = KERN_AIOMAX;
263	break;
264
265	case _SC_AIO_PRIO_DELTA_MAX:
266	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_AIO_PRIO_DELTA_MAX)
267	mib[0] = CTL_P1003_1B;
268	mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
269	break;
270	#else
271	return (-1);
272	#endif
273	case _SC_DELAYTIMER_MAX:
274	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_DELAYTIMER_MAX)
275	mib[0] = CTL_P1003_1B;
276	mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
277	goto yesno;
278	#else
279	return (-1);
280	#endif
281	case _SC_MQ_OPEN_MAX:
282	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_MQ_OPEN_MAX)
283	mib[0] = CTL_P1003_1B;
284	mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
285	goto yesno;
286	#else
287	return (-1);
288	#endif
289	case _SC_PAGESIZE:
290	defaultresult = getpagesize();
291	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_PAGESIZE)
292	mib[0] = CTL_P1003_1B;
293	mib[1] = CTL_P1003_1B_PAGESIZE;
294	goto yesno;
295	#else
296	return defaultresult;
297	#endif
298	case _SC_RTSIG_MAX:
299	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_RTSIG_MAX)
300	mib[0] = CTL_P1003_1B;
301	mib[1] = CTL_P1003_1B_RTSIG_MAX;
302	goto yesno;
303	#else
304	return (-1);
305	#endif
306	case _SC_SEM_NSEMS_MAX:
307	return (sysctlbyname("kern.sysv.semmns", &value, &len, NULL, 0) == -1 ? -1 : value);
308
309	case _SC_SEM_VALUE_MAX:
310	#if SEM_VALUE_MAX == 0
311	mib[0] = CTL_P1003_1B;
312	mib[1] = CTL_P1003_1B_SEM_VALUE_MAX;
313	goto yesno;
314	#else
315	return (SEM_VALUE_MAX);
316	#endif
317	case _SC_SIGQUEUE_MAX:
318	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_SIGQUEUE_MAX)
319	mib[0] = CTL_P1003_1B;
320	mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
321	goto yesno;
322	#else
323	return (-1);
324	#endif
325	case _SC_TIMER_MAX:
326	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_TIMER_MAX)
327	mib[0] = CTL_P1003_1B;
328	mib[1] = CTL_P1003_1B_TIMER_MAX;
329	#else
330	return (-1);
331	#endif
332
333	yesno: if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
334	return (-1);
335	if (value == 0)
336	return (defaultresult);
337	return (value);
338	case _SC_2_PBS:
339	case _SC_2_PBS_ACCOUNTING:
340	case _SC_2_PBS_CHECKPOINT:
341	case _SC_2_PBS_LOCATE:
342	case _SC_2_PBS_MESSAGE:
343	case _SC_2_PBS_TRACK:
344	return -1;
345	case _SC_ADVISORY_INFO:
346	#if _POSIX_ADVISORY_INFO == 0
347	#error "_POSIX_ADVISORY_INFO"
348	#else
349	return (_POSIX_ADVISORY_INFO);
350	#endif
351	case _SC_BARRIERS:
352	#if _POSIX_BARRIERS == 0
353	#error "_POSIX_BARRIERS"
354	#else
355	return (_POSIX_BARRIERS);
356	#endif
357	case _SC_CLOCK_SELECTION:
358	#if _POSIX_CLOCK_SELECTION == 0
359	#error "_POSIX_CLOCK_SELECTION"
360	#else
361	return (_POSIX_CLOCK_SELECTION);
362	#endif
363	case _SC_CPUTIME:
364	#if _POSIX_CPUTIME == 0
365	#error "_POSIX_CPUTIME"
366	#else
367	return (_POSIX_CPUTIME);
368	#endif
369	case _SC_FILE_LOCKING:
370	case _SC_GETGR_R_SIZE_MAX:
371	/* return sizeof(group) + group_name_max + group_passwd_max + max_group_member(MAXLOGNAME+1); /
372	return 4096; /* INT_MAX is too big for Perl */
373	case _SC_GETPW_R_SIZE_MAX:
374	return 4096;
375	case _SC_HOST_NAME_MAX:
376	return (MAXHOSTNAMELEN - 1); /* does not include \0 */
377	case _SC_LOGIN_NAME_MAX:
378	return (MAXLOGNAME);
379	case _SC_MONOTONIC_CLOCK:
380	#if _POSIX_MONOTONIC_CLOCK == 0
381	#error "_POSIX_MONOTONIC_CLOCK"
382	#else
383	return (_POSIX_MONOTONIC_CLOCK);
384	#endif
385	case _SC_MQ_PRIO_MAX:
386	return (-1);
387	case _SC_READER_WRITER_LOCKS:
388	return (_POSIX_READER_WRITER_LOCKS);
389	case _SC_REGEXP:
390	return (_POSIX_REGEXP);
391	case _SC_SHELL:
392	return (_POSIX_SHELL);
393	case _SC_SPAWN:
394	return (_POSIX_SPAWN);
395	case _SC_SPIN_LOCKS:
396	return (_POSIX_SPIN_LOCKS);
397	case _SC_SPORADIC_SERVER:
398	#if _POSIX_SPORADIC_SERVER == 0
399	#error "_POSIX_SPORADIC_SERVER"
400	#else
401	return (_POSIX_SPORADIC_SERVER);
402	#endif
403	case _SC_THREAD_ATTR_STACKADDR:
404	return (_POSIX_THREAD_ATTR_STACKADDR);
405	case _SC_THREAD_ATTR_STACKSIZE:
406	return (_POSIX_THREAD_ATTR_STACKSIZE);
407	case _SC_THREAD_CPUTIME:
408	return (_POSIX_THREAD_CPUTIME);
409	case _SC_THREAD_DESTRUCTOR_ITERATIONS:
410	return (PTHREAD_DESTRUCTOR_ITERATIONS);
411	case _SC_THREAD_KEYS_MAX:
412	return (PTHREAD_KEYS_MAX);
413	case _SC_THREAD_PRIO_INHERIT:
414	return (_POSIX_THREAD_PRIO_INHERIT);
415	case _SC_THREAD_PRIO_PROTECT:
416	return (_POSIX_THREAD_PRIO_PROTECT);
417	case _SC_THREAD_PRIORITY_SCHEDULING:
418	return (_POSIX_THREAD_PRIORITY_SCHEDULING);
419	case _SC_THREAD_PROCESS_SHARED:
420	return (_POSIX_THREAD_PROCESS_SHARED);
421	case _SC_THREAD_SAFE_FUNCTIONS:
422	return (_POSIX_THREAD_SAFE_FUNCTIONS);
423	case _SC_THREAD_SPORADIC_SERVER:
424	return (_POSIX_THREAD_SPORADIC_SERVER);
425	case _SC_THREAD_STACK_MIN:
426	return (PTHREAD_STACK_MIN);
427	case _SC_THREAD_THREADS_MAX:
428	#ifdef PTHREAD_THREADS_MAX
429	return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
430	#else
431	return (-1);
432	#endif
433	case _SC_TIMEOUTS:
434	return (_POSIX_TIMEOUTS);
435	case _SC_THREADS:
436	return (_POSIX_THREADS);
437	case _SC_TRACE:
438	#if _POSIX_TRACE == 0
439	#error "_POSIX_TRACE"
440	/* While you're implementing this, also do the ones below. */
441	#else
442	return (_POSIX_TRACE);
443	#endif
444	case _SC_TRACE_EVENT_FILTER:
445	return (_POSIX_TRACE_EVENT_FILTER);
446	case _SC_TRACE_INHERIT:
447	return (_POSIX_TRACE_INHERIT);
448	case _SC_TRACE_LOG:
449	return (_POSIX_TRACE_LOG);
450	case _SC_TTY_NAME_MAX:
451	path = "/"; // should be _PATH_DEV (PR-3624562)
452	goto do_NAME_MAX;
453	case _SC_TYPED_MEMORY_OBJECTS:
454	#if _POSIX_TYPED_MEMORY_OBJECTS == 0
455	#error "_POSIX_TYPED_MEMORY_OBJECTS"
456	#else
457	return (_POSIX_TYPED_MEMORY_OBJECTS);
458	#endif
459	case _SC_V6_ILP32_OFF32:
460	#if _V6_ILP32_OFF32 == 0
461	if (sizeof(int) * CHAR_BIT == 32 &&
462	sizeof(int) == sizeof(long) &&
463	sizeof(long) == sizeof(void *) &&
464	sizeof(void *) == sizeof(off_t))
465	return 1;
466	else
467	return -1;
468	#else
469	return (_V6_ILP32_OFF32);
470	#endif
471	case _SC_V6_ILP32_OFFBIG:
472	#if _V6_ILP32_OFFBIG == 0
473	if (sizeof(int) * CHAR_BIT == 32 &&
474	sizeof(int) == sizeof(long) &&
475	sizeof(long) == sizeof(void *) &&
476	sizeof(off_t) * CHAR_BIT >= 64)
477	return 1;
478	else
479	return -1;
480	#else
481	return (_V6_ILP32_OFFBIG);
482	#endif
483	case _SC_V6_LP64_OFF64:
484	#if _V6_LP64_OFF64 == 0
485	if (sizeof(int) * CHAR_BIT == 32 &&
486	sizeof(long) * CHAR_BIT == 64 &&
487	sizeof(long) == sizeof(void *) &&
488	sizeof(void *) == sizeof(off_t))
489	return 1;
490	else
491	return -1;
492	#else
493	return (_V6_LP64_OFF64);
494	#endif
495	case _SC_V6_LPBIG_OFFBIG:
496	#if _V6_LPBIG_OFFBIG == 0
497	if (sizeof(int) * CHAR_BIT >= 32 &&
498	sizeof(long) * CHAR_BIT >= 64 &&
499	sizeof(void ) CHAR_BIT >= 64 &&
500	sizeof(off_t) * CHAR_BIT >= 64)
501	return 1;
502	else
503	return -1;
504	#else
505	return (_V6_LPBIG_OFFBIG);
506	#endif
507	case _SC_ATEXIT_MAX:
508	return (INT_MAX); /* unlimited */
509	case _SC_IOV_MAX:
510	#ifdef KERN_IOV_MAX
511	mib[0] = CTL_KERN;
512	mib[1] = KERN_IOV_MAX;
513	break;
514	#else
515	return (IOV_MAX);
516	#endif
517	case _SC_XOPEN_CRYPT:
518	return (_XOPEN_CRYPT);
519	case _SC_XOPEN_ENH_I18N:
520	return (_XOPEN_ENH_I18N);
521	case _SC_XOPEN_LEGACY:
522	return (_XOPEN_LEGACY);
523	case _SC_XOPEN_REALTIME:
524	#if _XOPEN_REALTIME == 0
525	sverrno = errno;
526	value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
527	sysconf(_SC_MEMLOCK) > 0 &&
528	sysconf(_SC_MEMLOCK_RANGE) > 0 &&
529	sysconf(_SC_MESSAGE_PASSING) > 0 &&
530	sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
531	sysconf(_SC_REALTIME_SIGNALS) > 0 &&
532	sysconf(_SC_SEMAPHORES) > 0 &&
533	sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
534	sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
535	sysconf(_SC_TIMERS) > 0;
536	errno = sverrno;
537	if (value)
538	return (200112L);
539	else
540	return (-1);
541	#else
542	return (_XOPEN_REALTIME);
543	#endif
544	case _SC_XOPEN_REALTIME_THREADS:
545	#if _XOPEN_REALTIME_THREADS == 0
546	#error "_XOPEN_REALTIME_THREADS"
547	#else
548	return (_XOPEN_REALTIME_THREADS);
549	#endif
550	case _SC_XOPEN_SHM:
551	sverrno = errno;
552	len = sizeof(qdvalue);
553	if (sysctlbyname("kern.sysv.shmmin", &qdvalue, &len, NULL,
554	0) == -1) {
555	errno = sverrno;
556	return (-1);
557	}
558	errno = sverrno;
559	return (1);
560	case _SC_XOPEN_STREAMS:
561	return (_XOPEN_STREAMS);
562	case _SC_XOPEN_UNIX:
563	return (_XOPEN_UNIX);
564	#ifdef _XOPEN_VERSION
565	case _SC_XOPEN_VERSION:
566	return (_XOPEN_VERSION);
567	#endif
568	#ifdef _XOPEN_XCU_VERSION
569	case _SC_XOPEN_XCU_VERSION:
570	return (_XOPEN_XCU_VERSION);
571	#endif
572	case _SC_SYMLOOP_MAX:
573	return (MAXSYMLINKS);
574	case _SC_RAW_SOCKETS:
575	return (_POSIX_RAW_SOCKETS);
576	case _SC_IPV6:
577	#if _POSIX_IPV6 == 0
578	sverrno = errno;
579	value = socket(PF_INET6, SOCK_DGRAM, 0);
580	errno = sverrno;
581	if (value >= 0) {
582	close(value);
583	return (200112L);
584	} else
585	return (0);
586	#else
587	return (_POSIX_IPV6);
588	#endif
589
590	#ifdef _SC_NPROCESSORS_CONF
591	case _SC_NPROCESSORS_CONF:
592	#endif
593	#ifdef _SC_NPROCESSORS_ONLN
594	case _SC_NPROCESSORS_ONLN:
595	#endif
596	#if defined(_SC_NPROCESSORS_CONF) \|\| defined(_SC_NPROCESSORS_ONLN)
597	mib[0] = CTL_HW;
598	mib[1] = HW_NCPU;
599	break;
600	#endif
601	case _SC_XBS5_ILP32_OFF32:
602	return (_XBS5_ILP32_OFF32);
603	case _SC_XBS5_ILP32_OFFBIG:
604	return (_XBS5_ILP32_OFFBIG);
605	case _SC_XBS5_LP64_OFF64:
606	return (_XBS5_LP64_OFF64);
607	case _SC_XBS5_LPBIG_OFFBIG:
608	return (_XBS5_LPBIG_OFFBIG);
609	case _SC_SS_REPL_MAX:
610	return (_POSIX_SS_REPL_MAX);
611	case _SC_TRACE_EVENT_NAME_MAX:
612	return (_POSIX_TRACE_EVENT_NAME_MAX);
613	case _SC_TRACE_NAME_MAX:
614	return (_POSIX_TRACE_NAME_MAX);
615	case _SC_TRACE_SYS_MAX:
616	return (_POSIX_TRACE_SYS_MAX);
617	case _SC_TRACE_USER_EVENT_MAX:
618	return (_POSIX_TRACE_USER_EVENT_MAX);
619	case _SC_PASS_MAX:
620	return (PASS_MAX);
621
622	default:
623	errno = EINVAL;
624	return (-1);
625	}
626	return (sysctl(mib, 2, &value, &len, NULL, 0) == -1 ? -1 : value);
627	}