[apple/libc.git] / gen / FreeBSD / 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.
 */

#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: lib/libc/gen/sysconf.c r168718 $");

#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/FreeBSD/atexit.h"
#include "../../stdtime/FreeBSD/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 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:
	case _SC_STREAM_MAX:	/* assume fds run out before memory does */
		if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
			return (-1);
#if __LP64__
		/*
		 * In 64 bit world, sysconf is able to correctly represent
		 * rlim_t values (8 bytes).
		 */
		if (rl.rlim_cur > RLIM_INFINITY)
			return (-1);
		if (rl.rlim_cur > LONG_MAX) {
			errno = EOVERFLOW;
			return (-1);
		}
		lvalue = rl.rlim_cur;
#else
		/*
		 * In 32 bit world (watches), sysconf falls back to the
		 * old behavior: use (int) OPEN_MAX as max limit.  Ideally
		 * we would use maxfilesperproc as max limit, which is a
		 * system value adjusted by the kernel based on available
		 * RAM size. This value defaults to OPEN_MAX for systems
		 * with less than 8G of RAM.  So we use OPEN_MAX (defined
		 * in sys/syslimits.h) as max limit here in case
		 * applications with strict sandbox rules prevent libc
		 * from reading maxfilesperproc via sysctl.
		 */
		if (rl.rlim_cur > OPEN_MAX)
			lvalue = OPEN_MAX;
		else
			lvalue = (long)rl.rlim_cur;
#endif
		return lvalue;
	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:
#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_AIO_LISTIO_MAX)
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
#else
		mib[0] = CTL_KERN;;
		mib[1] = KERN_AIOMAX;
#endif
		break;
	case _SC_AIO_MAX:
#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_AIO_MAX)
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_AIO_MAX;
#else
		mib[0] = CTL_KERN;;
		mib[1] = KERN_AIOMAX;
#endif
		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:
#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_RTSIG_MAX)
		mib[0] = CTL_P1003_1B;
		mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX;
		goto yesno;
#else
		len = sizeof(value);
		return (sysctlbyname("kern.sysv.semmns", &value, &len, NULL, 0) == -1 ? -1 : value);
#endif

	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:
		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
	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);

#ifdef _SC_PHYS_PAGES
	case _SC_PHYS_PAGES:
#ifdef __APPLE__
		{
			long memsize;
			long pagesize;

			len = sizeof(memsize);
			if (sysctlbyname("hw.memsize", &memsize, &len, NULL, 0) == -1)
				return (-1);

			len = sizeof(pagesize);
			if (sysctlbyname("hw.pagesize", &pagesize, &len, NULL, 0) == -1)
				return (-1);

			return (memsize / pagesize);
		}
#else
		len = sizeof(lvalue);
		if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
			return (-1);
		return (lvalue);
#endif
#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
59e0d9fe 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.
59e0d9fe A	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)
	34	static char sccsid[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94";
	35	#endif /* LIBC_SCCS and not lint */
	36	#include <sys/cdefs.h>
5f125488	37	__FBSDID("$FreeBSD: lib/libc/gen/sysconf.c r168718 $");
59e0d9fe A	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>
ad3c9f2a A	44	#include <sys/aio.h>
ad3c9f2a A	45	#include <sys/semaphore.h>
59e0d9fe A	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
ad3c9f2a A	54	#include "../../stdlib/FreeBSD/atexit.h"
ad3c9f2a A	55	#include "../../stdtime/FreeBSD/tzfile.h"
59e0d9fe A	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	*/
	71	long
	72	sysconf(name)
	73	int name;
	74	{
	75	struct rlimit rl;
ad3c9f2a	76	quad_t qdvalue; /* for kern.sysv.shmmin */
59e0d9fe	77	size_t len;
ad3c9f2a	78	int mib[3], sverrno, value;
5f125488	79	long lvalue, defaultresult;
59e0d9fe A	80	const char *path;
59e0d9fe A	81
59e0d9fe A	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);
a9aaacca A	109	#if __LP64__
	110	/*
	111	* In 64 bit world, sysconf is able to correctly represent
	112	* rlim_t values (8 bytes).
	113	*/
	114	if (rl.rlim_cur > RLIM_INFINITY)
59e0d9fe A	115	return (-1);
	116	if (rl.rlim_cur > LONG_MAX) {
	117	errno = EOVERFLOW;
	118	return (-1);
	119	}
a9aaacca A	120	lvalue = rl.rlim_cur;
	121	#else
	122	/*
	123	* In 32 bit world (watches), sysconf falls back to the
	124	* old behavior: use (int) OPEN_MAX as max limit. Ideally
	125	* we would use maxfilesperproc as max limit, which is a
	126	* system value adjusted by the kernel based on available
	127	* RAM size. This value defaults to OPEN_MAX for systems
	128	* with less than 8G of RAM. So we use OPEN_MAX (defined
	129	* in sys/syslimits.h) as max limit here in case
	130	* applications with strict sandbox rules prevent libc
	131	* from reading maxfilesperproc via sysctl.
	132	*/
	133	if (rl.rlim_cur > OPEN_MAX)
	134	lvalue = OPEN_MAX;
	135	else
	136	lvalue = (long)rl.rlim_cur;
	137	#endif
	138	return lvalue;
59e0d9fe A	139	case _SC_JOB_CONTROL:
	140	return (_POSIX_JOB_CONTROL);
	141	case _SC_SAVED_IDS:
	142	/* XXX - must be 1 */
	143	mib[0] = CTL_KERN;
	144	mib[1] = KERN_SAVED_IDS;
	145	goto yesno;
	146	case _SC_VERSION:
	147	mib[0] = CTL_KERN;
	148	mib[1] = KERN_POSIX1;
	149	break;
	150	case _SC_BC_BASE_MAX:
	151	return (BC_BASE_MAX);
	152	case _SC_BC_DIM_MAX:
	153	return (BC_DIM_MAX);
	154	case _SC_BC_SCALE_MAX:
	155	return (BC_SCALE_MAX);
	156	case _SC_BC_STRING_MAX:
	157	return (BC_STRING_MAX);
	158	case _SC_COLL_WEIGHTS_MAX:
	159	return (COLL_WEIGHTS_MAX);
	160	case _SC_EXPR_NEST_MAX:
	161	return (EXPR_NEST_MAX);
	162	case _SC_LINE_MAX:
	163	return (LINE_MAX);
	164	case _SC_RE_DUP_MAX:
	165	return (RE_DUP_MAX);
	166	case _SC_2_VERSION:
	167	/*
	168	* This is something of a lie, but it would be silly at
	169	* this point to try to deduce this from the contents
	170	* of the filesystem.
	171	*/
	172	return (_POSIX2_VERSION);
	173	case _SC_2_C_BIND:
	174	return (_POSIX2_C_BIND);
	175	case _SC_2_C_DEV:
	176	return (_POSIX2_C_DEV);
	177	case _SC_2_CHAR_TERM:
	178	return (_POSIX2_CHAR_TERM);
	179	case _SC_2_FORT_DEV:
	180	return (_POSIX2_FORT_DEV);
	181	case _SC_2_FORT_RUN:
	182	return (_POSIX2_FORT_RUN);
	183	case _SC_2_LOCALEDEF:
	184	return (_POSIX2_LOCALEDEF);
	185	case _SC_2_SW_DEV:
	186	return (_POSIX2_SW_DEV);
	187	case _SC_2_UPE:
	188	return (_POSIX2_UPE);
	189	case _SC_TZNAME_MAX:
	190	path = _PATH_ZONEINFO;
	191	do_NAME_MAX:
	192	sverrno = errno;
	193	errno = 0;
5f125488 A	194	lvalue = pathconf(path, _PC_NAME_MAX);
5f125488 A	195	if (lvalue == -1 && errno != 0)
59e0d9fe A	196	return (-1);
59e0d9fe A	197	errno = sverrno;
5f125488	198	return (lvalue);
59e0d9fe A	199
	200	case _SC_ASYNCHRONOUS_IO:
	201	#if _POSIX_ASYNCHRONOUS_IO == 0
	202	mib[0] = CTL_P1003_1B;
	203	mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
	204	break;
	205	#else
	206	return (_POSIX_ASYNCHRONOUS_IO);
	207	#endif
	208	case _SC_MAPPED_FILES:
	209	return (_POSIX_MAPPED_FILES);
	210	case _SC_MEMLOCK:
	211	return (_POSIX_MEMLOCK);
	212	case _SC_MEMLOCK_RANGE:
	213	return (_POSIX_MEMLOCK_RANGE);
	214	case _SC_MEMORY_PROTECTION:
	215	return (_POSIX_MEMORY_PROTECTION);
	216	case _SC_MESSAGE_PASSING:
	217	#if _POSIX_MESSAGE_PASSING == 0
	218	mib[0] = CTL_P1003_1B;
	219	mib[1] = CTL_P1003_1B_MESSAGE_PASSING;
	220	goto yesno;
	221	#else
	222	return (_POSIX_MESSAGE_PASSING);
	223	#endif
	224	case _SC_PRIORITIZED_IO:
	225	#if _POSIX_PRIORITIZED_IO == 0
	226	mib[0] = CTL_P1003_1B;
	227	mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
	228	goto yesno;
	229	#else
	230	return (_POSIX_PRIORITIZED_IO);
	231	#endif
	232	case _SC_PRIORITY_SCHEDULING:
	233	#if _POSIX_PRIORITY_SCHEDULING == 0
	234	mib[0] = CTL_P1003_1B;
	235	mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
	236	goto yesno;
	237	#else
	238	return (_POSIX_PRIORITY_SCHEDULING);
	239	#endif
	240	case _SC_REALTIME_SIGNALS:
	241	#if _POSIX_REALTIME_SIGNALS == 0
	242	mib[0] = CTL_P1003_1B;
	243	mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
	244	goto yesno;
	245	#else
	246	return (_POSIX_REALTIME_SIGNALS);
	247	#endif
	248	case _SC_SEMAPHORES:
	249	#if _POSIX_SEMAPHORES == 0
	250	mib[0] = CTL_P1003_1B;
	251	mib[1] = CTL_P1003_1B_SEMAPHORES;
	252	goto yesno;
	253	#else
	254	return (_POSIX_SEMAPHORES);
	255	#endif
	256	case _SC_FSYNC:
	257	return (_POSIX_FSYNC);
	258
	259	case _SC_SHARED_MEMORY_OBJECTS:
	260	return (_POSIX_SHARED_MEMORY_OBJECTS);
	261	case _SC_SYNCHRONIZED_IO:
	262	#if _POSIX_SYNCHRONIZED_IO == 0
263	mib[0] = CTL_P1003_1B;
264	mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
265	goto yesno;
266	#else
267	return (_POSIX_SYNCHRONIZED_IO);
268	#endif
269	case _SC_TIMERS:
270	#if _POSIX_TIMERS == 0
271	mib[0] = CTL_P1003_1B;
272	mib[1] = CTL_P1003_1B_TIMERS;
273	goto yesno;
274	#else
275	return (_POSIX_TIMERS);
276	#endif
277	case _SC_AIO_LISTIO_MAX:
5f125488 A	278	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_AIO_LISTIO_MAX)
	279	mib[0] = CTL_P1003_1B;
	280	mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
	281	#else
	282	mib[0] = CTL_KERN;;
	283	mib[1] = KERN_AIOMAX;
	284	#endif
	285	break;
59e0d9fe	286	case _SC_AIO_MAX:
5f125488 A	287	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_AIO_MAX)
	288	mib[0] = CTL_P1003_1B;
	289	mib[1] = CTL_P1003_1B_AIO_MAX;
	290	#else
ad3c9f2a A	291	mib[0] = CTL_KERN;;
ad3c9f2a A	292	mib[1] = KERN_AIOMAX;
5f125488	293	#endif
59e0d9fe A	294	break;
59e0d9fe A	295	case _SC_AIO_PRIO_DELTA_MAX:
ad3c9f2a	296	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_AIO_PRIO_DELTA_MAX)
59e0d9fe A	297	mib[0] = CTL_P1003_1B;
	298	mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
	299	break;
ad3c9f2a A	300	#else
	301	return (-1);
	302	#endif
59e0d9fe	303	case _SC_DELAYTIMER_MAX:
ad3c9f2a	304	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_DELAYTIMER_MAX)
59e0d9fe A	305	mib[0] = CTL_P1003_1B;
	306	mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
	307	goto yesno;
ad3c9f2a A	308	#else
	309	return (-1);
	310	#endif
59e0d9fe	311	case _SC_MQ_OPEN_MAX:
ad3c9f2a	312	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_MQ_OPEN_MAX)
59e0d9fe A	313	mib[0] = CTL_P1003_1B;
	314	mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
	315	goto yesno;
ad3c9f2a A	316	#else
	317	return (-1);
	318	#endif
59e0d9fe A	319	case _SC_PAGESIZE:
59e0d9fe A	320	defaultresult = getpagesize();
ad3c9f2a	321	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_PAGESIZE)
59e0d9fe A	322	mib[0] = CTL_P1003_1B;
	323	mib[1] = CTL_P1003_1B_PAGESIZE;
	324	goto yesno;
ad3c9f2a A	325	#else
	326	return defaultresult;
	327	#endif
59e0d9fe	328	case _SC_RTSIG_MAX:
ad3c9f2a	329	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_RTSIG_MAX)
59e0d9fe A	330	mib[0] = CTL_P1003_1B;
	331	mib[1] = CTL_P1003_1B_RTSIG_MAX;
	332	goto yesno;
ad3c9f2a A	333	#else
	334	return (-1);
	335	#endif
59e0d9fe	336	case _SC_SEM_NSEMS_MAX:
5f125488 A	337	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_RTSIG_MAX)
	338	mib[0] = CTL_P1003_1B;
	339	mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX;
	340	goto yesno;
	341	#else
	342	len = sizeof(value);
ad3c9f2a	343	return (sysctlbyname("kern.sysv.semmns", &value, &len, NULL, 0) == -1 ? -1 : value);
5f125488	344	#endif
ad3c9f2a	345
59e0d9fe	346	case _SC_SEM_VALUE_MAX:
ad3c9f2a	347	#if SEM_VALUE_MAX == 0
59e0d9fe A	348	mib[0] = CTL_P1003_1B;
	349	mib[1] = CTL_P1003_1B_SEM_VALUE_MAX;
	350	goto yesno;
ad3c9f2a A	351	#else
	352	return (SEM_VALUE_MAX);
	353	#endif
59e0d9fe	354	case _SC_SIGQUEUE_MAX:
ad3c9f2a	355	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_SIGQUEUE_MAX)
59e0d9fe A	356	mib[0] = CTL_P1003_1B;
	357	mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
	358	goto yesno;
ad3c9f2a A	359	#else
	360	return (-1);
	361	#endif
59e0d9fe	362	case _SC_TIMER_MAX:
ad3c9f2a	363	#if defined(CTL_P1003_1B) && defined(CTL_P1003_1B_TIMER_MAX)
59e0d9fe A	364	mib[0] = CTL_P1003_1B;
59e0d9fe A	365	mib[1] = CTL_P1003_1B_TIMER_MAX;
ad3c9f2a A	366	#else
	367	return (-1);
	368	#endif
59e0d9fe	369
5f125488 A	370	yesno:
	371	len = sizeof(value);
	372	if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
59e0d9fe A	373	return (-1);
	374	if (value == 0)
	375	return (defaultresult);
5f125488 A	376	return ((long)value);
5f125488 A	377
59e0d9fe A	378	case _SC_2_PBS:
	379	case _SC_2_PBS_ACCOUNTING:
	380	case _SC_2_PBS_CHECKPOINT:
	381	case _SC_2_PBS_LOCATE:
	382	case _SC_2_PBS_MESSAGE:
	383	case _SC_2_PBS_TRACK:
5f125488 A	384	#if _POSIX2_PBS == 0
	385	#error "don't know how to determine _SC_2_PBS"
	386	/*
	387	* This probably requires digging through the filesystem
	388	* to see if the appropriate package has been installed.
	389	* Since we don't currently support this option at all,
	390	* it's not worth the effort to write the code now.
	391	* Figuring out which of the sub-options are supported
	392	* would be even more difficult, so it's probably easier
	393	* to always say ``no''.
	394	*/
	395	#else
	396	return (_POSIX2_PBS);
	397	#endif
59e0d9fe A	398	case _SC_ADVISORY_INFO:
	399	#if _POSIX_ADVISORY_INFO == 0
	400	#error "_POSIX_ADVISORY_INFO"
	401	#else
	402	return (_POSIX_ADVISORY_INFO);
	403	#endif
	404	case _SC_BARRIERS:
	405	#if _POSIX_BARRIERS == 0
	406	#error "_POSIX_BARRIERS"
	407	#else
	408	return (_POSIX_BARRIERS);
	409	#endif
	410	case _SC_CLOCK_SELECTION:
	411	#if _POSIX_CLOCK_SELECTION == 0
	412	#error "_POSIX_CLOCK_SELECTION"
	413	#else
	414	return (_POSIX_CLOCK_SELECTION);
	415	#endif
	416	case _SC_CPUTIME:
	417	#if _POSIX_CPUTIME == 0
	418	#error "_POSIX_CPUTIME"
	419	#else
	420	return (_POSIX_CPUTIME);
	421	#endif
59e0d9fe	422	case _SC_FILE_LOCKING:
59e0d9fe	423	case _SC_GETGR_R_SIZE_MAX:
ad3c9f2a A	424	/* return sizeof(group) + group_name_max + group_passwd_max + max_group_member(MAXLOGNAME+1); /
ad3c9f2a A	425	return 4096; /* INT_MAX is too big for Perl */
59e0d9fe	426	case _SC_GETPW_R_SIZE_MAX:
ad3c9f2a	427	return 4096;
59e0d9fe A	428	case _SC_HOST_NAME_MAX:
	429	return (MAXHOSTNAMELEN - 1); /* does not include \0 */
	430	case _SC_LOGIN_NAME_MAX:
	431	return (MAXLOGNAME);
	432	case _SC_MONOTONIC_CLOCK:
	433	#if _POSIX_MONOTONIC_CLOCK == 0
	434	#error "_POSIX_MONOTONIC_CLOCK"
	435	#else
	436	return (_POSIX_MONOTONIC_CLOCK);
	437	#endif
59e0d9fe	438	case _SC_MQ_PRIO_MAX:
ad3c9f2a	439	return (-1);
59e0d9fe A	440	case _SC_READER_WRITER_LOCKS:
	441	return (_POSIX_READER_WRITER_LOCKS);
	442	case _SC_REGEXP:
	443	return (_POSIX_REGEXP);
	444	case _SC_SHELL:
	445	return (_POSIX_SHELL);
	446	case _SC_SPAWN:
	447	return (_POSIX_SPAWN);
	448	case _SC_SPIN_LOCKS:
	449	return (_POSIX_SPIN_LOCKS);
	450	case _SC_SPORADIC_SERVER:
	451	#if _POSIX_SPORADIC_SERVER == 0
	452	#error "_POSIX_SPORADIC_SERVER"
	453	#else
	454	return (_POSIX_SPORADIC_SERVER);
	455	#endif
	456	case _SC_THREAD_ATTR_STACKADDR:
	457	return (_POSIX_THREAD_ATTR_STACKADDR);
	458	case _SC_THREAD_ATTR_STACKSIZE:
	459	return (_POSIX_THREAD_ATTR_STACKSIZE);
	460	case _SC_THREAD_CPUTIME:
	461	return (_POSIX_THREAD_CPUTIME);
	462	case _SC_THREAD_DESTRUCTOR_ITERATIONS:
	463	return (PTHREAD_DESTRUCTOR_ITERATIONS);
	464	case _SC_THREAD_KEYS_MAX:
	465	return (PTHREAD_KEYS_MAX);
	466	case _SC_THREAD_PRIO_INHERIT:
	467	return (_POSIX_THREAD_PRIO_INHERIT);
	468	case _SC_THREAD_PRIO_PROTECT:
	469	return (_POSIX_THREAD_PRIO_PROTECT);
	470	case _SC_THREAD_PRIORITY_SCHEDULING:
	471	return (_POSIX_THREAD_PRIORITY_SCHEDULING);
	472	case _SC_THREAD_PROCESS_SHARED:
	473	return (_POSIX_THREAD_PROCESS_SHARED);
	474	case _SC_THREAD_SAFE_FUNCTIONS:
	475	return (_POSIX_THREAD_SAFE_FUNCTIONS);
ad3c9f2a A	476	case _SC_THREAD_SPORADIC_SERVER:
ad3c9f2a A	477	return (_POSIX_THREAD_SPORADIC_SERVER);
59e0d9fe A	478	case _SC_THREAD_STACK_MIN:
	479	return (PTHREAD_STACK_MIN);
	480	case _SC_THREAD_THREADS_MAX:
ad3c9f2a	481	#ifdef PTHREAD_THREADS_MAX
59e0d9fe	482	return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
ad3c9f2a A	483	#else
	484	return (-1);
	485	#endif
59e0d9fe A	486	case _SC_TIMEOUTS:
	487	return (_POSIX_TIMEOUTS);
	488	case _SC_THREADS:
	489	return (_POSIX_THREADS);
	490	case _SC_TRACE:
	491	#if _POSIX_TRACE == 0
	492	#error "_POSIX_TRACE"
	493	/* While you're implementing this, also do the ones below. */
	494	#else
	495	return (_POSIX_TRACE);
	496	#endif
59e0d9fe A	497	case _SC_TRACE_EVENT_FILTER:
	498	return (_POSIX_TRACE_EVENT_FILTER);
	499	case _SC_TRACE_INHERIT:
	500	return (_POSIX_TRACE_INHERIT);
	501	case _SC_TRACE_LOG:
	502	return (_POSIX_TRACE_LOG);
59e0d9fe	503	case _SC_TTY_NAME_MAX:
ad3c9f2a	504	path = "/"; // should be _PATH_DEV (PR-3624562)
59e0d9fe A	505	goto do_NAME_MAX;
	506	case _SC_TYPED_MEMORY_OBJECTS:
	507	#if _POSIX_TYPED_MEMORY_OBJECTS == 0
	508	#error "_POSIX_TYPED_MEMORY_OBJECTS"
	509	#else
	510	return (_POSIX_TYPED_MEMORY_OBJECTS);
	511	#endif
	512	case _SC_V6_ILP32_OFF32:
	513	#if _V6_ILP32_OFF32 == 0
	514	if (sizeof(int) * CHAR_BIT == 32 &&
	515	sizeof(int) == sizeof(long) &&
	516	sizeof(long) == sizeof(void *) &&
	517	sizeof(void *) == sizeof(off_t))
	518	return 1;
	519	else
	520	return -1;
	521	#else
	522	return (_V6_ILP32_OFF32);
	523	#endif
	524	case _SC_V6_ILP32_OFFBIG:
	525	#if _V6_ILP32_OFFBIG == 0
	526	if (sizeof(int) * CHAR_BIT == 32 &&
	527	sizeof(int) == sizeof(long) &&
	528	sizeof(long) == sizeof(void *) &&
	529	sizeof(off_t) * CHAR_BIT >= 64)
	530	return 1;
	531	else
	532	return -1;
	533	#else
	534	return (_V6_ILP32_OFFBIG);
	535	#endif
	536	case _SC_V6_LP64_OFF64:
	537	#if _V6_LP64_OFF64 == 0
	538	if (sizeof(int) * CHAR_BIT == 32 &&
	539	sizeof(long) * CHAR_BIT == 64 &&
	540	sizeof(long) == sizeof(void *) &&
	541	sizeof(void *) == sizeof(off_t))
	542	return 1;
	543	else
	544	return -1;
	545	#else
	546	return (_V6_LP64_OFF64);
	547	#endif
	548	case _SC_V6_LPBIG_OFFBIG:
	549	#if _V6_LPBIG_OFFBIG == 0
	550	if (sizeof(int) * CHAR_BIT >= 32 &&
	551	sizeof(long) * CHAR_BIT >= 64 &&
	552	sizeof(void ) CHAR_BIT >= 64 &&
	553	sizeof(off_t) * CHAR_BIT >= 64)
	554	return 1;
	555	else
	556	return -1;
	557	#else
	558	return (_V6_LPBIG_OFFBIG);
	559	#endif
	560	case _SC_ATEXIT_MAX:
ad3c9f2a	561	return (INT_MAX); /* unlimited */
59e0d9fe	562	case _SC_IOV_MAX:
ad3c9f2a	563	#ifdef KERN_IOV_MAX
59e0d9fe A	564	mib[0] = CTL_KERN;
	565	mib[1] = KERN_IOV_MAX;
	566	break;
ad3c9f2a A	567	#else
	568	return (IOV_MAX);
	569	#endif
59e0d9fe A	570	case _SC_XOPEN_CRYPT:
	571	return (_XOPEN_CRYPT);
	572	case _SC_XOPEN_ENH_I18N:
	573	return (_XOPEN_ENH_I18N);
	574	case _SC_XOPEN_LEGACY:
	575	return (_XOPEN_LEGACY);
	576	case _SC_XOPEN_REALTIME:
	577	#if _XOPEN_REALTIME == 0
	578	sverrno = errno;
	579	value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
	580	sysconf(_SC_MEMLOCK) > 0 &&
	581	sysconf(_SC_MEMLOCK_RANGE) > 0 &&
	582	sysconf(_SC_MESSAGE_PASSING) > 0 &&
	583	sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
	584	sysconf(_SC_REALTIME_SIGNALS) > 0 &&
	585	sysconf(_SC_SEMAPHORES) > 0 &&
	586	sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
	587	sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
	588	sysconf(_SC_TIMERS) > 0;
	589	errno = sverrno;
	590	if (value)
	591	return (200112L);
	592	else
	593	return (-1);
	594	#else
	595	return (_XOPEN_REALTIME);
	596	#endif
	597	case _SC_XOPEN_REALTIME_THREADS:
	598	#if _XOPEN_REALTIME_THREADS == 0
	599	#error "_XOPEN_REALTIME_THREADS"
	600	#else
	601	return (_XOPEN_REALTIME_THREADS);
	602	#endif
	603	case _SC_XOPEN_SHM:
	604	sverrno = errno;
ad3c9f2a A	605	len = sizeof(qdvalue);
ad3c9f2a A	606	if (sysctlbyname("kern.sysv.shmmin", &qdvalue, &len, NULL,
59e0d9fe A	607	0) == -1) {
	608	errno = sverrno;
	609	return (-1);
	610	}
	611	errno = sverrno;
	612	return (1);
	613	case _SC_XOPEN_STREAMS:
	614	return (_XOPEN_STREAMS);
	615	case _SC_XOPEN_UNIX:
	616	return (_XOPEN_UNIX);
	617	#ifdef _XOPEN_VERSION
	618	case _SC_XOPEN_VERSION:
	619	return (_XOPEN_VERSION);
	620	#endif
	621	#ifdef _XOPEN_XCU_VERSION
	622	case _SC_XOPEN_XCU_VERSION:
	623	return (_XOPEN_XCU_VERSION);
	624	#endif
	625	case _SC_SYMLOOP_MAX:
	626	return (MAXSYMLINKS);
	627	case _SC_RAW_SOCKETS:
	628	return (_POSIX_RAW_SOCKETS);
	629	case _SC_IPV6:
	630	#if _POSIX_IPV6 == 0
	631	sverrno = errno;
	632	value = socket(PF_INET6, SOCK_DGRAM, 0);
	633	errno = sverrno;
	634	if (value >= 0) {
	635	close(value);
	636	return (200112L);
	637	} else
	638	return (0);
	639	#else
	640	return (_POSIX_IPV6);
	641	#endif
	642
ad3c9f2a	643	#ifdef _SC_NPROCESSORS_CONF
59e0d9fe	644	case _SC_NPROCESSORS_CONF:
ad3c9f2a A	645	#endif
ad3c9f2a A	646	#ifdef _SC_NPROCESSORS_ONLN
59e0d9fe	647	case _SC_NPROCESSORS_ONLN:
ad3c9f2a A	648	#endif
ad3c9f2a A	649	#if defined(_SC_NPROCESSORS_CONF) \|\| defined(_SC_NPROCESSORS_ONLN)
59e0d9fe A	650	mib[0] = CTL_HW;
	651	mib[1] = HW_NCPU;
	652	break;
ad3c9f2a A	653	#endif
	654	case _SC_XBS5_ILP32_OFF32:
	655	return (_XBS5_ILP32_OFF32);
	656	case _SC_XBS5_ILP32_OFFBIG:
	657	return (_XBS5_ILP32_OFFBIG);
	658	case _SC_XBS5_LP64_OFF64:
	659	return (_XBS5_LP64_OFF64);
	660	case _SC_XBS5_LPBIG_OFFBIG:
	661	return (_XBS5_LPBIG_OFFBIG);
	662	case _SC_SS_REPL_MAX:
	663	return (_POSIX_SS_REPL_MAX);
	664	case _SC_TRACE_EVENT_NAME_MAX:
	665	return (_POSIX_TRACE_EVENT_NAME_MAX);
	666	case _SC_TRACE_NAME_MAX:
	667	return (_POSIX_TRACE_NAME_MAX);
	668	case _SC_TRACE_SYS_MAX:
	669	return (_POSIX_TRACE_SYS_MAX);
	670	case _SC_TRACE_USER_EVENT_MAX:
	671	return (_POSIX_TRACE_USER_EVENT_MAX);
	672	case _SC_PASS_MAX:
	673	return (PASS_MAX);
59e0d9fe	674
5f125488 A	675	#ifdef _SC_PHYS_PAGES
	676	case _SC_PHYS_PAGES:
	677	#ifdef __APPLE__
	678	{
	679	long memsize;
	680	long pagesize;
	681
	682	len = sizeof(memsize);
	683	if (sysctlbyname("hw.memsize", &memsize, &len, NULL, 0) == -1)
	684	return (-1);
	685
	686	len = sizeof(pagesize);
	687	if (sysctlbyname("hw.pagesize", &pagesize, &len, NULL, 0) == -1)
	688	return (-1);
	689
	690	return (memsize / pagesize);
	691	}
	692	#else
	693	len = sizeof(lvalue);
	694	if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
	695	return (-1);
	696	return (lvalue);
	697	#endif
	698	#endif
	699
59e0d9fe A	700	default:
	701	errno = EINVAL;
	702	return (-1);
	703	}
5f125488 A	704	len = sizeof(value);
	705	if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
	706	value = -1;
	707	return ((long)value);
59e0d9fe	708	}