[dragonfly.git] / lib / libc / gen / sysconf.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.
 * 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.
 *
 * @(#)sysconf.c	8.2 (Berkeley) 3/20/94
 * $FreeBSD: src/lib/libc/gen/sysconf.c,v 1.26 2008/02/27 05:56:57 wollman Exp $
 * $DragonFly: src/lib/libc/gen/sysconf.c,v 1.5 2008/02/21 12:47:54 hasso Exp $
 */

#include <sys/param.h>
#include <sys/time.h>
#include <sys/sysctl.h>
#include <sys/resource.h>
#include <sys/socket.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(int name)
{
	struct rlimit rl;
	size_t len;
	int mib[2], sverrno, value;
	long lvalue, defaultresult;
	const char *path;

	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:
		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_STREAM_MAX:
		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);
		}
		/*
		 * struct __sFILE currently has a limitation that
		 * file descriptors must fit in a signed short.
		 * This doesn't precisely capture the letter of POSIX
		 * but approximates the spirit.
		 */
		if (rl.rlim_cur > SHRT_MAX)
			return (SHRT_MAX);

		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;
		lvalue = pathconf(path, _PC_NAME_MAX);
		if (lvalue == -1 && errno != 0)
			return (-1);
		errno = sverrno;
		return (lvalue);

	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:
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
		break;
	case _SC_AIO_MAX:
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_AIO_MAX;
		break;
	case _SC_AIO_PRIO_DELTA_MAX:
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
		break;
	case _SC_DELAYTIMER_MAX:
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
		goto yesno;
	case _SC_MQ_OPEN_MAX:
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
		goto yesno;
	case _SC_PAGESIZE:
		defaultresult = getpagesize();
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_PAGESIZE;
		goto yesno;
	case _SC_RTSIG_MAX:
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_RTSIG_MAX;
		goto yesno;
	case _SC_SEM_NSEMS_MAX:
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX;
		goto yesno;
	case _SC_SEM_VALUE_MAX:
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_SEM_VALUE_MAX;
		goto yesno;
	case _SC_SIGQUEUE_MAX:
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
		goto yesno;
	case _SC_TIMER_MAX:
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_TIMER_MAX;
yesno:
		len = sizeof(value);
		if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
			return (-1);
		if (value == 0)
			return (defaultresult);
		return ((long)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:
#if _POSIX2_PBS == 0
#error "don't know how to determine _SC_2_PBS"
		/*
		 * This probably requires digging through the filesystem
		 * to see if the appropriate package has been installed.
		 * Since we don't currently support this option at all,
		 * it's not worth the effort to write the code now.
		 * Figuring out which of the sub-options are supported
		 * would be even more difficult, so it's probably easier
		 * to always say ``no''.
		 */
#else
		return (_POSIX2_PBS);
#endif
	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
#ifdef notdef
	case _SC_FILE_LOCKING:
		/*
		 * XXX - The standard doesn't tell us how to define
		 * _POSIX_FILE_LOCKING, so we can't answer this one.
		 */
#endif
#if _POSIX_THREAD_SAFE_FUNCTIONS > -1
	case _SC_GETGR_R_SIZE_MAX:
	case _SC_GETPW_R_SIZE_MAX:
#error "somebody needs to implement this"
#endif
	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:
		len = sizeof(lvalue);
		if (sysctlbyname("kern.mqueue.mq_prio_max", &lvalue, &len,
			NULL, 0) == -1)
			return (-1);
		return (lvalue);

	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_STACK_MIN:
		return (PTHREAD_STACK_MIN);
	case _SC_THREAD_THREADS_MAX:
		return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
	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
#if _POSIX_TRACE > -1
	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);
#endif
	case _SC_TTY_NAME_MAX:
		path = _PATH_DEV;
		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 (ATEXIT_SIZE);
	case _SC_IOV_MAX:
		mib[0] = CTL_KERN;
		mib[1] = KERN_IOV_MAX;
		break;
	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:
		len = sizeof(lvalue);
		sverrno = errno;
		if (sysctlbyname("kern.ipc.shmmin", &lvalue, &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

	case _SC_NPROCESSORS_CONF:
	case _SC_NPROCESSORS_ONLN:
		mib[0] = CTL_HW;
		mib[1] = HW_NCPU;
		break;

#ifdef _SC_PHYS_PAGES
	case _SC_PHYS_PAGES:
		len = sizeof(lvalue);
		if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
			return (-1);
		return (lvalue);
#endif

	default:
		errno = EINVAL;
		return (-1);
	}
	len = sizeof(value);
	if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
		value = -1;
	return ((long)value);
}
Commit	Line	Data
984263bc MD	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.
984263bc MD	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.
1de703da MD	31	*
1de703da MD	32	* @(#)sysconf.c 8.2 (Berkeley) 3/20/94
9d66746c	33	* $FreeBSD: src/lib/libc/gen/sysconf.c,v 1.26 2008/02/27 05:56:57 wollman Exp $
dd47c5d8	34	* $DragonFly: src/lib/libc/gen/sysconf.c,v 1.5 2008/02/21 12:47:54 hasso Exp $
984263bc MD	35	*/
984263bc MD	36
984263bc MD	37	#include <sys/param.h>
	38	#include <sys/time.h>
	39	#include <sys/sysctl.h>
	40	#include <sys/resource.h>
9d66746c	41	#include <sys/socket.h>
984263bc MD	42
984263bc MD	43	#include <errno.h>
9d66746c PA	44	#include <limits.h>
	45	#include <paths.h>
	46	#include <pthread.h> /* we just need the limits */
984263bc MD	47	#include <time.h>
	48	#include <unistd.h>
	49
9d66746c PA	50	#include "../stdlib/atexit.h"
	51	#include "../stdtime/tzfile.h"
	52
	53	#define _PATH_ZONEINFO TZDIR /* from tzfile.h */
	54
984263bc MD	55	/*
	56	* sysconf --
	57	* get configurable system variables.
	58	*
	59	* XXX
	60	* POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
	61	* not change during the lifetime of the calling process. This would seem
	62	* to require that any change to system limits kill all running processes.
	63	* A workaround might be to cache the values when they are first retrieved
	64	* and then simply return the cached value on subsequent calls. This is
	65	* less useful than returning up-to-date values, however.
	66	*/
	67	long
0f52d283	68	sysconf(int name)
984263bc MD	69	{
	70	struct rlimit rl;
	71	size_t len;
9d66746c PA	72	int mib[2], sverrno, value;
	73	long lvalue, defaultresult;
	74	const char *path;
984263bc	75
984263bc MD	76	defaultresult = -1;
	77
	78	switch (name) {
984263bc MD	79	case _SC_ARG_MAX:
	80	mib[0] = CTL_KERN;
	81	mib[1] = KERN_ARGMAX;
	82	break;
	83	case _SC_CHILD_MAX:
9d66746c PA	84	if (getrlimit(RLIMIT_NPROC, &rl) != 0)
	85	return (-1);
	86	if (rl.rlim_cur == RLIM_INFINITY)
	87	return (-1);
	88	if (rl.rlim_cur > LONG_MAX) {
	89	errno = EOVERFLOW;
	90	return (-1);
	91	}
	92	return ((long)rl.rlim_cur);
984263bc MD	93	case _SC_CLK_TCK:
984263bc MD	94	return (CLK_TCK);
984263bc MD	95	case _SC_NGROUPS_MAX:
	96	mib[0] = CTL_KERN;
	97	mib[1] = KERN_NGROUPS;
	98	break;
	99	case _SC_OPEN_MAX:
9d66746c PA	100	if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
	101	return (-1);
	102	if (rl.rlim_cur == RLIM_INFINITY)
	103	return (-1);
	104	if (rl.rlim_cur > LONG_MAX) {
	105	errno = EOVERFLOW;
	106	return (-1);
	107	}
	108	return ((long)rl.rlim_cur);
984263bc	109	case _SC_STREAM_MAX:
9d66746c PA	110	if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
	111	return (-1);
	112	if (rl.rlim_cur == RLIM_INFINITY)
	113	return (-1);
	114	if (rl.rlim_cur > LONG_MAX) {
	115	errno = EOVERFLOW;
	116	return (-1);
	117	}
	118	/*
	119	* struct __sFILE currently has a limitation that
	120	* file descriptors must fit in a signed short.
	121	* This doesn't precisely capture the letter of POSIX
	122	* but approximates the spirit.
	123	*/
	124	if (rl.rlim_cur > SHRT_MAX)
	125	return (SHRT_MAX);
	126
	127	return ((long)rl.rlim_cur);
	128	case _SC_JOB_CONTROL:
	129	return (_POSIX_JOB_CONTROL);
984263bc	130	case _SC_SAVED_IDS:
9d66746c	131	/* XXX - must be 1 */
984263bc MD	132	mib[0] = CTL_KERN;
	133	mib[1] = KERN_SAVED_IDS;
	134	goto yesno;
	135	case _SC_VERSION:
	136	mib[0] = CTL_KERN;
	137	mib[1] = KERN_POSIX1;
	138	break;
984263bc	139	case _SC_BC_BASE_MAX:
9d66746c	140	return (BC_BASE_MAX);
984263bc	141	case _SC_BC_DIM_MAX:
9d66746c	142	return (BC_DIM_MAX);
984263bc	143	case _SC_BC_SCALE_MAX:
9d66746c	144	return (BC_SCALE_MAX);
984263bc	145	case _SC_BC_STRING_MAX:
9d66746c	146	return (BC_STRING_MAX);
984263bc	147	case _SC_COLL_WEIGHTS_MAX:
9d66746c	148	return (COLL_WEIGHTS_MAX);
984263bc	149	case _SC_EXPR_NEST_MAX:
9d66746c	150	return (EXPR_NEST_MAX);
984263bc	151	case _SC_LINE_MAX:
9d66746c	152	return (LINE_MAX);
984263bc	153	case _SC_RE_DUP_MAX:
9d66746c	154	return (RE_DUP_MAX);
984263bc	155	case _SC_2_VERSION:
9d66746c PA	156	/*
	157	* This is something of a lie, but it would be silly at
	158	* this point to try to deduce this from the contents
	159	* of the filesystem.
	160	*/
	161	return (_POSIX2_VERSION);
984263bc	162	case _SC_2_C_BIND:
9d66746c	163	return (_POSIX2_C_BIND);
984263bc	164	case _SC_2_C_DEV:
9d66746c	165	return (_POSIX2_C_DEV);
984263bc	166	case _SC_2_CHAR_TERM:
9d66746c	167	return (_POSIX2_CHAR_TERM);
984263bc	168	case _SC_2_FORT_DEV:
9d66746c	169	return (_POSIX2_FORT_DEV);
984263bc	170	case _SC_2_FORT_RUN:
9d66746c	171	return (_POSIX2_FORT_RUN);
984263bc	172	case _SC_2_LOCALEDEF:
9d66746c	173	return (_POSIX2_LOCALEDEF);
984263bc	174	case _SC_2_SW_DEV:
9d66746c	175	return (_POSIX2_SW_DEV);
984263bc	176	case _SC_2_UPE:
9d66746c PA	177	return (_POSIX2_UPE);
	178	case _SC_TZNAME_MAX:
	179	path = _PATH_ZONEINFO;
	180	do_NAME_MAX:
	181	sverrno = errno;
	182	errno = 0;
	183	lvalue = pathconf(path, _PC_NAME_MAX);
	184	if (lvalue == -1 && errno != 0)
	185	return (-1);
	186	errno = sverrno;
	187	return (lvalue);
984263bc MD	188
984263bc MD	189	case _SC_ASYNCHRONOUS_IO:
9d66746c	190	#if _POSIX_ASYNCHRONOUS_IO == 0
984263bc MD	191	mib[0] = CTL_P1003_1B;
984263bc MD	192	mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
9d66746c PA	193	break;
	194	#else
	195	return (_POSIX_ASYNCHRONOUS_IO);
	196	#endif
984263bc	197	case _SC_MAPPED_FILES:
9d66746c	198	return (_POSIX_MAPPED_FILES);
984263bc	199	case _SC_MEMLOCK:
9d66746c	200	return (_POSIX_MEMLOCK);
984263bc	201	case _SC_MEMLOCK_RANGE:
9d66746c	202	return (_POSIX_MEMLOCK_RANGE);
984263bc	203	case _SC_MEMORY_PROTECTION:
9d66746c	204	return (_POSIX_MEMORY_PROTECTION);
984263bc	205	case _SC_MESSAGE_PASSING:
9d66746c	206	#if _POSIX_MESSAGE_PASSING == 0
984263bc MD	207	mib[0] = CTL_P1003_1B;
	208	mib[1] = CTL_P1003_1B_MESSAGE_PASSING;
	209	goto yesno;
9d66746c PA	210	#else
	211	return (_POSIX_MESSAGE_PASSING);
	212	#endif
984263bc	213	case _SC_PRIORITIZED_IO:
9d66746c	214	#if _POSIX_PRIORITIZED_IO == 0
984263bc MD	215	mib[0] = CTL_P1003_1B;
	216	mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
	217	goto yesno;
9d66746c PA	218	#else
	219	return (_POSIX_PRIORITIZED_IO);
	220	#endif
984263bc	221	case _SC_PRIORITY_SCHEDULING:
9d66746c	222	#if _POSIX_PRIORITY_SCHEDULING == 0
984263bc MD	223	mib[0] = CTL_P1003_1B;
	224	mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
	225	goto yesno;
9d66746c PA	226	#else
	227	return (_POSIX_PRIORITY_SCHEDULING);
	228	#endif
984263bc	229	case _SC_REALTIME_SIGNALS:
9d66746c	230	#if _POSIX_REALTIME_SIGNALS == 0
984263bc MD	231	mib[0] = CTL_P1003_1B;
	232	mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
	233	goto yesno;
9d66746c PA	234	#else
	235	return (_POSIX_REALTIME_SIGNALS);
	236	#endif
984263bc	237	case _SC_SEMAPHORES:
9d66746c	238	#if _POSIX_SEMAPHORES == 0
984263bc MD	239	mib[0] = CTL_P1003_1B;
	240	mib[1] = CTL_P1003_1B_SEMAPHORES;
	241	goto yesno;
9d66746c PA	242	#else
	243	return (_POSIX_SEMAPHORES);
	244	#endif
984263bc	245	case _SC_FSYNC:
9d66746c PA	246	return (_POSIX_FSYNC);
9d66746c PA	247
984263bc	248	case _SC_SHARED_MEMORY_OBJECTS:
9d66746c	249	return (_POSIX_SHARED_MEMORY_OBJECTS);
984263bc	250	case _SC_SYNCHRONIZED_IO:
9d66746c	251	#if _POSIX_SYNCHRONIZED_IO == 0
984263bc MD	252	mib[0] = CTL_P1003_1B;
	253	mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
	254	goto yesno;
9d66746c PA	255	#else
	256	return (_POSIX_SYNCHRONIZED_IO);
	257	#endif
984263bc	258	case _SC_TIMERS:
9d66746c	259	#if _POSIX_TIMERS == 0
984263bc MD	260	mib[0] = CTL_P1003_1B;
	261	mib[1] = CTL_P1003_1B_TIMERS;
	262	goto yesno;
9d66746c PA	263	#else
	264	return (_POSIX_TIMERS);
	265	#endif
984263bc MD	266	case _SC_AIO_LISTIO_MAX:
	267	mib[0] = CTL_P1003_1B;
	268	mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
9d66746c	269	break;
984263bc MD	270	case _SC_AIO_MAX:
	271	mib[0] = CTL_P1003_1B;
	272	mib[1] = CTL_P1003_1B_AIO_MAX;
9d66746c	273	break;
984263bc MD	274	case _SC_AIO_PRIO_DELTA_MAX:
	275	mib[0] = CTL_P1003_1B;
	276	mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
9d66746c	277	break;
984263bc MD	278	case _SC_DELAYTIMER_MAX:
	279	mib[0] = CTL_P1003_1B;
	280	mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
	281	goto yesno;
	282	case _SC_MQ_OPEN_MAX:
	283	mib[0] = CTL_P1003_1B;
	284	mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
	285	goto yesno;
	286	case _SC_PAGESIZE:
	287	defaultresult = getpagesize();
	288	mib[0] = CTL_P1003_1B;
	289	mib[1] = CTL_P1003_1B_PAGESIZE;
	290	goto yesno;
	291	case _SC_RTSIG_MAX:
	292	mib[0] = CTL_P1003_1B;
	293	mib[1] = CTL_P1003_1B_RTSIG_MAX;
	294	goto yesno;
	295	case _SC_SEM_NSEMS_MAX:
	296	mib[0] = CTL_P1003_1B;
	297	mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX;
	298	goto yesno;
	299	case _SC_SEM_VALUE_MAX:
	300	mib[0] = CTL_P1003_1B;
	301	mib[1] = CTL_P1003_1B_SEM_VALUE_MAX;
	302	goto yesno;
	303	case _SC_SIGQUEUE_MAX:
	304	mib[0] = CTL_P1003_1B;
	305	mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
	306	goto yesno;
	307	case _SC_TIMER_MAX:
	308	mib[0] = CTL_P1003_1B;
	309	mib[1] = CTL_P1003_1B_TIMER_MAX;
9d66746c PA	310	yesno:
	311	len = sizeof(value);
	312	if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
	313	return (-1);
	314	if (value == 0)
	315	return (defaultresult);
	316	return ((long)value);
	317
	318	case _SC_2_PBS:
	319	case _SC_2_PBS_ACCOUNTING:
	320	case _SC_2_PBS_CHECKPOINT:
	321	case _SC_2_PBS_LOCATE:
	322	case _SC_2_PBS_MESSAGE:
	323	case _SC_2_PBS_TRACK:
	324	#if _POSIX2_PBS == 0
	325	#error "don't know how to determine _SC_2_PBS"
	326	/*
	327	* This probably requires digging through the filesystem
	328	* to see if the appropriate package has been installed.
	329	* Since we don't currently support this option at all,
	330	* it's not worth the effort to write the code now.
	331	* Figuring out which of the sub-options are supported
	332	* would be even more difficult, so it's probably easier
	333	* to always say ``no''.
	334	*/
	335	#else
	336	return (_POSIX2_PBS);
	337	#endif
	338	case _SC_ADVISORY_INFO:
	339	#if _POSIX_ADVISORY_INFO == 0
	340	#error "_POSIX_ADVISORY_INFO"
	341	#else
	342	return (_POSIX_ADVISORY_INFO);
	343	#endif
	344	case _SC_BARRIERS:
	345	#if _POSIX_BARRIERS == 0
	346	#error "_POSIX_BARRIERS"
	347	#else
	348	return (_POSIX_BARRIERS);
	349	#endif
	350	case _SC_CLOCK_SELECTION:
	351	#if _POSIX_CLOCK_SELECTION == 0
	352	#error "_POSIX_CLOCK_SELECTION"
	353	#else
	354	return (_POSIX_CLOCK_SELECTION);
	355	#endif
	356	case _SC_CPUTIME:
	357	#if _POSIX_CPUTIME == 0
	358	#error "_POSIX_CPUTIME"
	359	#else
	360	return (_POSIX_CPUTIME);
	361	#endif
	362	#ifdef notdef
	363	case _SC_FILE_LOCKING:
	364	/*
	365	* XXX - The standard doesn't tell us how to define
	366	* _POSIX_FILE_LOCKING, so we can't answer this one.
	367	*/
	368	#endif
	369	#if _POSIX_THREAD_SAFE_FUNCTIONS > -1
	370	case _SC_GETGR_R_SIZE_MAX:
	371	case _SC_GETPW_R_SIZE_MAX:
	372	#error "somebody needs to implement this"
	373	#endif
374	case _SC_HOST_NAME_MAX:
375	return (MAXHOSTNAMELEN - 1); /* does not include \0 */
376	case _SC_LOGIN_NAME_MAX:
377	return (MAXLOGNAME);
378	case _SC_MONOTONIC_CLOCK:
379	#if _POSIX_MONOTONIC_CLOCK == 0
380	#error "_POSIX_MONOTONIC_CLOCK"
381	#else
382	return (_POSIX_MONOTONIC_CLOCK);
383	#endif
9d66746c	384	case _SC_MQ_PRIO_MAX:
d2506be8 SK	385	len = sizeof(lvalue);
	386	if (sysctlbyname("kern.mqueue.mq_prio_max", &lvalue, &len,
	387	NULL, 0) == -1)
	388	return (-1);
	389	return (lvalue);
	390
9d66746c PA	391	case _SC_READER_WRITER_LOCKS:
	392	return (_POSIX_READER_WRITER_LOCKS);
	393	case _SC_REGEXP:
	394	return (_POSIX_REGEXP);
	395	case _SC_SHELL:
	396	return (_POSIX_SHELL);
	397	case _SC_SPAWN:
	398	return (_POSIX_SPAWN);
	399	case _SC_SPIN_LOCKS:
	400	return (_POSIX_SPIN_LOCKS);
	401	case _SC_SPORADIC_SERVER:
	402	#if _POSIX_SPORADIC_SERVER == 0
	403	#error "_POSIX_SPORADIC_SERVER"
	404	#else
	405	return (_POSIX_SPORADIC_SERVER);
	406	#endif
	407	case _SC_THREAD_ATTR_STACKADDR:
	408	return (_POSIX_THREAD_ATTR_STACKADDR);
	409	case _SC_THREAD_ATTR_STACKSIZE:
	410	return (_POSIX_THREAD_ATTR_STACKSIZE);
	411	case _SC_THREAD_CPUTIME:
	412	return (_POSIX_THREAD_CPUTIME);
	413	case _SC_THREAD_DESTRUCTOR_ITERATIONS:
	414	return (PTHREAD_DESTRUCTOR_ITERATIONS);
	415	case _SC_THREAD_KEYS_MAX:
	416	return (PTHREAD_KEYS_MAX);
	417	case _SC_THREAD_PRIO_INHERIT:
	418	return (_POSIX_THREAD_PRIO_INHERIT);
	419	case _SC_THREAD_PRIO_PROTECT:
	420	return (_POSIX_THREAD_PRIO_PROTECT);
	421	case _SC_THREAD_PRIORITY_SCHEDULING:
	422	return (_POSIX_THREAD_PRIORITY_SCHEDULING);
	423	case _SC_THREAD_PROCESS_SHARED:
	424	return (_POSIX_THREAD_PROCESS_SHARED);
	425	case _SC_THREAD_SAFE_FUNCTIONS:
	426	return (_POSIX_THREAD_SAFE_FUNCTIONS);
	427	case _SC_THREAD_STACK_MIN:
	428	return (PTHREAD_STACK_MIN);
	429	case _SC_THREAD_THREADS_MAX:
	430	return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
	431	case _SC_TIMEOUTS:
	432	return (_POSIX_TIMEOUTS);
	433	case _SC_THREADS:
	434	return (_POSIX_THREADS);
	435	case _SC_TRACE:
	436	#if _POSIX_TRACE == 0
	437	#error "_POSIX_TRACE"
	438	/* While you're implementing this, also do the ones below. */
	439	#else
	440	return (_POSIX_TRACE);
	441	#endif
	442	#if _POSIX_TRACE > -1
	443	case _SC_TRACE_EVENT_FILTER:
	444	return (_POSIX_TRACE_EVENT_FILTER);
	445	case _SC_TRACE_INHERIT:
	446	return (_POSIX_TRACE_INHERIT);
	447	case _SC_TRACE_LOG:
	448	return (_POSIX_TRACE_LOG);
	449	#endif
	450	case _SC_TTY_NAME_MAX:
	451	path = _PATH_DEV;
	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 (ATEXIT_SIZE);
509	case _SC_IOV_MAX:
510	mib[0] = CTL_KERN;
511	mib[1] = KERN_IOV_MAX;
512	break;
513	case _SC_XOPEN_CRYPT:
514	return (_XOPEN_CRYPT);
515	case _SC_XOPEN_ENH_I18N:
516	return (_XOPEN_ENH_I18N);
517	case _SC_XOPEN_LEGACY:
518	return (_XOPEN_LEGACY);
519	case _SC_XOPEN_REALTIME:
520	#if _XOPEN_REALTIME == 0
521	sverrno = errno;
522	value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
523	sysconf(_SC_MEMLOCK) > 0 &&
524	sysconf(_SC_MEMLOCK_RANGE) > 0 &&
525	sysconf(_SC_MESSAGE_PASSING) > 0 &&
526	sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
527	sysconf(_SC_REALTIME_SIGNALS) > 0 &&
528	sysconf(_SC_SEMAPHORES) > 0 &&
529	sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
530	sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
531	sysconf(_SC_TIMERS) > 0;
532	errno = sverrno;
533	if (value)
534	return (200112L);
535	else
536	return (-1);
537	#else
538	return (_XOPEN_REALTIME);
539	#endif
540	case _SC_XOPEN_REALTIME_THREADS:
541	#if _XOPEN_REALTIME_THREADS == 0
542	#error "_XOPEN_REALTIME_THREADS"
543	#else
544	return (_XOPEN_REALTIME_THREADS);
545	#endif
546	case _SC_XOPEN_SHM:
547	len = sizeof(lvalue);
548	sverrno = errno;
549	if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL,
550	0) == -1) {
551	errno = sverrno;
552	return (-1);
553	}
554	errno = sverrno;
555	return (1);
556	case _SC_XOPEN_STREAMS:
557	return (_XOPEN_STREAMS);
558	case _SC_XOPEN_UNIX:
559	return (_XOPEN_UNIX);
560	#ifdef _XOPEN_VERSION
561	case _SC_XOPEN_VERSION:
562	return (_XOPEN_VERSION);
563	#endif
564	#ifdef _XOPEN_XCU_VERSION
565	case _SC_XOPEN_XCU_VERSION:
566	return (_XOPEN_XCU_VERSION);
567	#endif
568	case _SC_SYMLOOP_MAX:
569	return (MAXSYMLINKS);
570	case _SC_RAW_SOCKETS:
571	return (_POSIX_RAW_SOCKETS);
572	case _SC_IPV6:
573	#if _POSIX_IPV6 == 0
574	sverrno = errno;
575	value = socket(PF_INET6, SOCK_DGRAM, 0);
576	errno = sverrno;
577	if (value >= 0) {
578	close(value);
579	return (200112L);
580	} else
581	return (0);
582	#else
583	return (_POSIX_IPV6);
584	#endif
585
dd47c5d8 HT	586	case _SC_NPROCESSORS_CONF:
	587	case _SC_NPROCESSORS_ONLN:
	588	mib[0] = CTL_HW;
	589	mib[1] = HW_NCPU;
9d66746c	590	break;
984263bc	591
9d66746c PA	592	#ifdef _SC_PHYS_PAGES
	593	case _SC_PHYS_PAGES:
	594	len = sizeof(lvalue);
	595	if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
984263bc	596	return (-1);
9d66746c PA	597	return (lvalue);
	598	#endif
	599
984263bc MD	600	default:
	601	errno = EINVAL;
	602	return (-1);
	603	}
9d66746c PA	604	len = sizeof(value);
	605	if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
	606	value = -1;
	607	return ((long)value);
984263bc	608	}