/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/*	Copyright (c) 1988 AT&T	*/

/*	  All Rights Reserved  	*/

/* sysconf(3C) - returns system configuration information */

#pragma weak _sysconf = sysconf

#include "lint.h"

#include <mtlib.h>

#include <sys/types.h>

#include <unistd.h>

#include <sys/sysconfig.h>

#include <limits.h>

#include <time.h>

#include <errno.h>

#include <nss_dbdefs.h>

#include <thread.h>

#include <xti.h>

#include "libc.h"

#include "xpg6.h"

/* from nss_common.c */

extern size_t _nss_get_bufsizes(int);

long

sysconf(int name)

{

	static int _pagesize = 0;

	static int _hz = 0;

	static pid_t _maxpid = 0;

	static int _stackprot = 0;

	static int _ngroups_max;

	extern int __xpg4;

	switch (name) {

		default:

			errno = EINVAL;

			return (-1L);

		case _SC_ARG_MAX:

			return ((long)ARG_MAX);

		case _SC_CLK_TCK:

			if (_hz <= 0)

				_hz = _sysconfig(_CONFIG_CLK_TCK);

			return (_hz);

		case _SC_JOB_CONTROL:

			return ((long)_POSIX_JOB_CONTROL);

		case _SC_SAVED_IDS:

			return ((long)_POSIX_SAVED_IDS);

		case _SC_CHILD_MAX:

			return (_sysconfig(_CONFIG_CHILD_MAX));

		case _SC_NGROUPS_MAX:

			if (_ngroups_max <= 0)

				_ngroups_max = _sysconfig(_CONFIG_NGROUPS);

			return (_ngroups_max);

		case _SC_OPEN_MAX:

			return (_sysconfig(_CONFIG_OPEN_FILES));

		case _SC_VERSION:

			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)

				return (200112L);

			else

				return (199506L);

		case _SC_PAGESIZE:

			if (_pagesize <= 0)

				_pagesize = _sysconfig(_CONFIG_PAGESIZE);

			return (_pagesize);

		case _SC_XOPEN_VERSION:

			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)

				return (600L);

			else if (__xpg4 == 0)

				return (_sysconfig(_CONFIG_XOPEN_VER));

			else

				return (4L);

		case _SC_XOPEN_XCU_VERSION:

			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)

				return (600L);

			else

				return (4L);

		/*

		 * old value for pre XPG5 conformant systems to match

		 * getpass() length.

		 * XPG5 special cased with __sysconf_xpg5()

		 * new value for default and modern XPG systems.

		 */

		case _SC_PASS_MAX:

			if ((__xpg4 == 1) &&

			    (!(__xpg6 & _C99SUSv3_XPG6_sysconf_version)))

				return ((long)_PASS_MAX_XPG);

			else

				return ((long)_PASS_MAX);

		case _SC_LOGNAME_MAX:

			return ((long)LOGNAME_MAX);

		case _SC_STREAM_MAX:

			return (_sysconfig(_CONFIG_OPEN_FILES));

		case _SC_TZNAME_MAX:

			return (-1L);

		case _SC_NPROCESSORS_CONF:

			return (_sysconfig(_CONFIG_NPROC_CONF));

		case _SC_NPROCESSORS_ONLN:

			return (_sysconfig(_CONFIG_NPROC_ONLN));

		case _SC_NPROCESSORS_MAX:

			return (_sysconfig(_CONFIG_NPROC_MAX));

		case _SC_STACK_PROT:

			if (_stackprot == 0)

				_stackprot = _sysconfig(_CONFIG_STACK_PROT);

			return (_stackprot);

		/* POSIX.4 names */

		/*

		 * Each of the following also have _POSIX_* symbols

		 * defined in <unistd.h>. Values here should align

		 * with values in the header. Up until the SUSv3 standard

		 * we defined these simply as 1. With the introduction

		 * of the new revision, these were changed to 200112L.

		 * The standard allows us to change the value, however,

		 * we have kept both values in case application programs

		 * are relying on the previous value even though an

		 * application doing so is technically wrong.

		 */

		case _SC_ASYNCHRONOUS_IO:

		case _SC_FSYNC:

		case _SC_MAPPED_FILES:

		case _SC_MEMLOCK:

		case _SC_MEMLOCK_RANGE:

		case _SC_MEMORY_PROTECTION:

		case _SC_MESSAGE_PASSING:

		case _SC_PRIORITY_SCHEDULING:

		case _SC_REALTIME_SIGNALS:

		case _SC_SEMAPHORES:

		case _SC_SHARED_MEMORY_OBJECTS:

		case _SC_SYNCHRONIZED_IO:

		case _SC_TIMERS:

			if (__xpg6 & _C99SUSv3_mode_ON)

				return (200112L);

			else

				return (1L);

		case _SC_PRIORITIZED_IO:

#ifdef _POSIX_PRIORITIZED_IO

			return (1L);

#else

			return (-1L);

#endif

		case _SC_AIO_LISTIO_MAX:

			return (_sysconfig(_CONFIG_AIO_LISTIO_MAX));

		case _SC_AIO_MAX:

			return (_sysconfig(_CONFIG_AIO_MAX));

		case _SC_AIO_PRIO_DELTA_MAX:

			return (_sysconfig(_CONFIG_AIO_PRIO_DELTA_MAX));

		case _SC_DELAYTIMER_MAX:

			return (_sysconfig(_CONFIG_DELAYTIMER_MAX));

		case _SC_MQ_OPEN_MAX:

			return (_sysconfig(_CONFIG_MQ_OPEN_MAX));

		case _SC_MQ_PRIO_MAX:

			return (_sysconfig(_CONFIG_MQ_PRIO_MAX));

		case _SC_RTSIG_MAX:

			return (_sysconfig(_CONFIG_RTSIG_MAX));

		case _SC_SEM_NSEMS_MAX:

			return (_sysconfig(_CONFIG_SEM_NSEMS_MAX));

		case _SC_SEM_VALUE_MAX:

			return (_sysconfig(_CONFIG_SEM_VALUE_MAX));

		case _SC_SIGQUEUE_MAX:

			return (_sysconfig(_CONFIG_SIGQUEUE_MAX));

		case _SC_SIGRT_MAX:

			return (_sysconfig(_CONFIG_SIGRT_MAX));

		case _SC_SIGRT_MIN:

			return (_sysconfig(_CONFIG_SIGRT_MIN));

		case _SC_TIMER_MAX:

			return (_sysconfig(_CONFIG_TIMER_MAX));

		case _SC_PHYS_PAGES:

			return (_sysconfig(_CONFIG_PHYS_PAGES));

		case _SC_AVPHYS_PAGES:

			return (_sysconfig(_CONFIG_AVPHYS_PAGES));

		/* XPG4/POSIX.1-1990/POSIX.2-1992 names */

		case _SC_2_C_BIND:

			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)

				return (200112L);

			else

				return (1L);

		case _SC_2_CHAR_TERM:

			return ((long)_POSIX2_CHAR_TERM);

		case _SC_2_C_DEV:

			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)

				return (200112L);

			else

				return (1L);

		case _SC_2_C_VERSION:

			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)

				return (200112L);

			else

				return (199209L);

		case _SC_2_FORT_DEV:

			return (-1L);

		case _SC_2_FORT_RUN:

			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)

				return (200112L);

			else

				return (1L);

		case _SC_2_LOCALEDEF:

			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)

				return (200112L);

			else

				return (1L);

		case _SC_2_SW_DEV:

			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)

				return (200112L);

			else

				return (1L);

		case _SC_2_UPE:

			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)

				return (200112L);

			else

				return (1L);

		case _SC_2_VERSION:

			if (__xpg6 & _C99SUSv3_XPG6_sysconf_version)

				return (200112L);

			else

				return (199209L);

		case _SC_BC_BASE_MAX:

			return ((long)BC_BASE_MAX);

		case _SC_BC_DIM_MAX:

			return ((long)BC_DIM_MAX);

		case _SC_BC_SCALE_MAX:

			return ((long)BC_SCALE_MAX);

		case _SC_BC_STRING_MAX:

			return ((long)BC_STRING_MAX);

		case _SC_COLL_WEIGHTS_MAX:

			return ((long)COLL_WEIGHTS_MAX);

		case _SC_EXPR_NEST_MAX:

			return ((long)EXPR_NEST_MAX);

		case _SC_LINE_MAX:

			return ((long)LINE_MAX);

		case _SC_RE_DUP_MAX:

			return ((long)RE_DUP_MAX);

		case _SC_XOPEN_CRYPT:

			return (1L);

		case _SC_XOPEN_ENH_I18N:

			return ((long)_XOPEN_ENH_I18N);

		case _SC_XOPEN_SHM:

			return ((long)_XOPEN_SHM);

		/* XPG4v2 (SUS) names */

		case _SC_XOPEN_UNIX:

			return (1L);

		case _SC_XOPEN_LEGACY:

			return (1L);

		case _SC_ATEXIT_MAX:

			return (-1L);

		case _SC_IOV_MAX:

			return ((long)IOV_MAX);

		case _SC_T_IOV_MAX:

			return ((long)T_IOV_MAX);

		/* XPG5 (SUSv2) names */

		case _SC_XOPEN_REALTIME:

			return (1L);

		case _SC_XOPEN_REALTIME_THREADS:

#if defined(_POSIX_THREAD_PRIORITY_SCHEDULING) && \

	defined(_POSIX_THREAD_PRIO_INHERIT) && \

	defined(_POSIX_THREAD_PRIO_PROTECT)

			return (1L);

#else

			return (-1L);

#endif

		case _SC_XBS5_ILP32_OFF32:

			return (1L);

		case _SC_XBS5_ILP32_OFFBIG:

			return (1L);

		case _SC_XBS5_LP64_OFF64:

			return (1L);

		case _SC_XBS5_LPBIG_OFFBIG:

			return (1L);

		/* POSIX.1c names */

		case _SC_THREAD_DESTRUCTOR_ITERATIONS:

			return (-1L);

		case _SC_GETGR_R_SIZE_MAX:

			return ((long)_nss_get_bufsizes(_SC_GETGR_R_SIZE_MAX));

		case _SC_GETPW_R_SIZE_MAX:

			return ((long)NSS_BUFLEN_PASSWD);

		case _SC_LOGIN_NAME_MAX:

			return ((long)(LOGNAME_MAX + 1));

		case _SC_THREAD_KEYS_MAX:

			return (-1L);

		case _SC_THREAD_STACK_MIN:

			return ((long)thr_min_stack());

		case _SC_THREAD_THREADS_MAX:

			return (-1L);

		case _SC_TTY_NAME_MAX:

			return ((long)TTYNAME_MAX);

		case _SC_BARRIERS:

			return ((long)_POSIX_BARRIERS);

		case _SC_CLOCK_SELECTION:

			return ((long)_POSIX_CLOCK_SELECTION);

		case _SC_MONOTONIC_CLOCK:

			return ((long)_POSIX_MONOTONIC_CLOCK);

		case _SC_SPAWN:

			return ((long)_POSIX_SPAWN);

		case _SC_SPIN_LOCKS:

			return ((long)_POSIX_SPIN_LOCKS);

		case _SC_THREADS:

		case _SC_THREAD_ATTR_STACKADDR:

		case _SC_THREAD_ATTR_STACKSIZE:

		case _SC_THREAD_PRIORITY_SCHEDULING:

		case _SC_THREAD_PRIO_INHERIT:

		case _SC_THREAD_PRIO_PROTECT:

		case _SC_THREAD_PROCESS_SHARED:

		case _SC_THREAD_SAFE_FUNCTIONS:

			if (__xpg6 & _C99SUSv3_mode_ON)

				return (200112L);

			else

				return (1L);

		case _SC_TIMEOUTS:

			return ((long)_POSIX_TIMEOUTS);

		/* 1216676 - cache info */

		case _SC_COHER_BLKSZ:

			return (_sysconfig(_CONFIG_COHERENCY));

		case _SC_SPLIT_CACHE:

			return (_sysconfig(_CONFIG_SPLIT_CACHE));

		case _SC_ICACHE_SZ:

			return (_sysconfig(_CONFIG_ICACHESZ));

		case _SC_DCACHE_SZ:

			return (_sysconfig(_CONFIG_DCACHESZ));

		case _SC_ICACHE_LINESZ:

			return (_sysconfig(_CONFIG_ICACHELINESZ));

		case _SC_DCACHE_LINESZ:

			return (_sysconfig(_CONFIG_DCACHELINESZ));

		case _SC_ICACHE_BLKSZ:

			return (_sysconfig(_CONFIG_ICACHEBLKSZ));

		case _SC_DCACHE_BLKSZ:

			return (_sysconfig(_CONFIG_DCACHEBLKSZ));

		case _SC_DCACHE_TBLKSZ:

			return (_sysconfig(_CONFIG_DCACHETBLKSZ));

		case _SC_ICACHE_ASSOC:

			return (_sysconfig(_CONFIG_ICACHE_ASSOC));

		case _SC_DCACHE_ASSOC:

			return (_sysconfig(_CONFIG_DCACHE_ASSOC));

		case _SC_MAXPID:

			if (_maxpid <= 0)

				_maxpid = _sysconfig(_CONFIG_MAXPID);

			return (_maxpid);

		case _SC_CPUID_MAX:

			return (_sysconfig(_CONFIG_CPUID_MAX));

		case _SC_EPHID_MAX:

			return (_sysconfig(_CONFIG_EPHID_MAX));

		/* UNIX 03 names - XPG6/SUSv3/POSIX.1-2001 */

		case _SC_REGEXP:

			return ((long)_POSIX_REGEXP);

		case _SC_SHELL:

			return ((long)_POSIX_SHELL);

		case _SC_ADVISORY_INFO:

			return ((long)_POSIX_ADVISORY_INFO);

		case _SC_HOST_NAME_MAX:

			return ((long)_POSIX_HOST_NAME_MAX);

		case _SC_READER_WRITER_LOCKS:

			return ((long)_POSIX_READER_WRITER_LOCKS);

		case _SC_IPV6:

			return ((long)_POSIX_IPV6);

		case _SC_RAW_SOCKETS:

			return ((long)_POSIX_RAW_SOCKETS);

		case _SC_XOPEN_STREAMS:

			return ((long)_XOPEN_STREAMS);

		case _SC_SYMLOOP_MAX:

			return (_sysconfig(_CONFIG_SYMLOOP_MAX));

		case _SC_V6_ILP32_OFF32:

			return (1L);

		case _SC_V6_ILP32_OFFBIG:

			return (1L);

		case _SC_V6_LP64_OFF64:

			return (1L);

		case _SC_V6_LPBIG_OFFBIG:

			return (1L);

		/* Unsupported UNIX 03 options */

		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:

		case _SC_CPUTIME:

		case _SC_SPORADIC_SERVER:

		case _SC_SS_REPL_MAX:

		case _SC_THREAD_CPUTIME:

		case _SC_THREAD_SPORADIC_SERVER:

		case _SC_TRACE:

		case _SC_TRACE_EVENT_FILTER:

		case _SC_TRACE_EVENT_NAME_MAX:

		case _SC_TRACE_INHERIT:

		case _SC_TRACE_LOG:

		case _SC_TRACE_NAME_MAX: