/* Copyright (C) 1991-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <limits.h>

#include <grp.h>

#include <pwd.h>

#include <stddef.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <time.h>

#include <unistd.h>

#include <sys/param.h>

#include <sys/stat.h>

#include <sys/sysinfo.h>

#include <sys/types.h>

#include <sys/uio.h>

#include <regex.h>

#define NEED_SPEC_ARRAY 0

#include <posix-conf-vars.h>

#define NEED_CHECK_SPEC \

  (!defined _XBS5_ILP32_OFF32 || !defined _XBS5_ILP32_OFFBIG \

   || !defined _XBS5_LP64_OFF64 || !defined _XBS5_LPBIG_OFFBIG \

   || !defined _POSIX_V6_ILP32_OFF32 || !defined _POSIX_V6_ILP32_OFFBIG \

   || !defined _POSIX_V6_LP64_OFF64 || !defined _POSIX_V6_LPBIG_OFFBIG \

   || !defined _POSIX_V7_ILP32_OFF32 || !defined _POSIX_V7_ILP32_OFFBIG \

   || !defined _POSIX_V7_LP64_OFF64 || !defined _POSIX_V7_LPBIG_OFFBIG)

#if NEED_CHECK_SPEC

static long int __sysconf_check_spec (const char *spec);

#endif

/* Get the value of the system variable NAME.  */

long int

__sysconf (int name)

{

  switch (name)

    {

      /* Also add obsolete or unnecessarily added constants here.  */

    case _SC_EQUIV_CLASS_MAX:

    default:

      __set_errno (EINVAL);

      return -1;

    case _SC_ARG_MAX:

#ifdef	ARG_MAX

      return ARG_MAX;

#else

      return -1;

#endif

    case _SC_CHILD_MAX:

#ifdef	CHILD_MAX

      return CHILD_MAX;

#else

      return __get_child_max ();

#endif

    case _SC_CLK_TCK:

      return __getclktck ();

    case _SC_NGROUPS_MAX:

#ifdef	NGROUPS_MAX

      return NGROUPS_MAX;

#else

      return -1;

#endif

    case _SC_OPEN_MAX:

      return __getdtablesize ();

    case _SC_STREAM_MAX:

#ifdef	STREAM_MAX

      return STREAM_MAX;

#else

      return FOPEN_MAX;

#endif

    case _SC_TZNAME_MAX:

      return -1;

    case _SC_JOB_CONTROL:

#if CONF_IS_DEFINED_SET (_POSIX_JOB_CONTROL)

      return _POSIX_JOB_CONTROL;

#else

      return -1;

#endif

    case _SC_SAVED_IDS:

#if CONF_IS_DEFINED_SET (_POSIX_SAVED_IDS)

      return 1;

#else

      return -1;

#endif

    case _SC_REALTIME_SIGNALS:

#if CONF_IS_DEFINED_SET (_POSIX_REALTIME_SIGNALS)

      return _POSIX_REALTIME_SIGNALS;

#else

      return -1;

#endif

    case _SC_PRIORITY_SCHEDULING:

#if CONF_IS_DEFINED_SET (_POSIX_PRIORITY_SCHEDULING)

      return _POSIX_PRIORITY_SCHEDULING;

#else

      return -1;

#endif

    case _SC_TIMERS:

#if CONF_IS_DEFINED_SET (_POSIX_TIMERS)

      return _POSIX_TIMERS;

#else

      return -1;

#endif

    case _SC_ASYNCHRONOUS_IO:

#if CONF_IS_DEFINED_SET (_POSIX_ASYNCHRONOUS_IO)

      return _POSIX_ASYNCHRONOUS_IO;

#else

      return -1;

#endif

    case _SC_PRIORITIZED_IO:

#if CONF_IS_DEFINED_SET (_POSIX_PRIORITIZED_IO)

      return _POSIX_PRIORITIZED_IO;

#else

      return -1;

#endif

    case _SC_SYNCHRONIZED_IO:

#if CONF_IS_DEFINED_SET (_POSIX_SYNCHRONIZED_IO)

      return _POSIX_SYNCHRONIZED_IO;

#else

      return -1;

#endif

    case _SC_FSYNC:

#if CONF_IS_DEFINED_SET (_POSIX_FSYNC)

      return _POSIX_FSYNC;

#else

      return -1;

#endif

    case _SC_MAPPED_FILES:

#if CONF_IS_DEFINED_SET (_POSIX_MAPPED_FILES)

      return _POSIX_MAPPED_FILES;

#else

      return -1;

#endif

    case _SC_MEMLOCK:

#if CONF_IS_DEFINED_SET (_POSIX_MEMLOCK)

      return _POSIX_MEMLOCK;

#else

      return -1;

#endif

    case _SC_MEMLOCK_RANGE:

#if CONF_IS_DEFINED_SET (_POSIX_MEMLOCK_RANGE)

      return _POSIX_MEMLOCK_RANGE;

#else

      return -1;

#endif

    case _SC_MEMORY_PROTECTION:

#if CONF_IS_DEFINED_SET (_POSIX_MEMORY_PROTECTION)

      return _POSIX_MEMORY_PROTECTION;

#else

      return -1;

#endif

    case _SC_MESSAGE_PASSING:

#if CONF_IS_DEFINED_SET (_POSIX_MESSAGE_PASSING)

      return _POSIX_MESSAGE_PASSING;

#else

      return -1;

#endif

    case _SC_SEMAPHORES:

#if CONF_IS_DEFINED_SET (_POSIX_SEMAPHORES)

      return _POSIX_SEMAPHORES;

#else

      return -1;

#endif

    case _SC_SHARED_MEMORY_OBJECTS:

#if CONF_IS_DEFINED_SET (_POSIX_SHARED_MEMORY_OBJECTS)

      return _POSIX_SHARED_MEMORY_OBJECTS;

#else

      return -1;

#endif

    case _SC_VERSION:

      return _POSIX_VERSION;

    case _SC_PAGESIZE:

      return __getpagesize ();

    case _SC_AIO_LISTIO_MAX:

#ifdef	AIO_LISTIO_MAX

      return AIO_LISTIO_MAX;

#else

      return -1;

#endif

    case _SC_AIO_MAX:

#ifdef	AIO_MAX

      return AIO_MAX;

#else

      return -1;

#endif

    case _SC_AIO_PRIO_DELTA_MAX:

#ifdef	AIO_PRIO_DELTA_MAX

      return AIO_PRIO_DELTA_MAX;

#else

      return -1;

#endif

    case _SC_DELAYTIMER_MAX:

#ifdef	DELAYTIMER_MAX

      return DELAYTIMER_MAX;

#else

      return -1;

#endif

    case _SC_MQ_OPEN_MAX:

#ifdef	MQ_OPEN_MAX

      return MQ_OPEN_MAX;

#else

      return -1;

#endif

    case _SC_MQ_PRIO_MAX:

#ifdef	MQ_PRIO_MAX

      return MQ_PRIO_MAX;

#else

      return -1;

#endif

    case _SC_RTSIG_MAX:

#ifdef	RTSIG_MAX

      return RTSIG_MAX;

#else

      return -1;

#endif

    case _SC_SEM_NSEMS_MAX:

#ifdef	SEM_NSEMS_MAX

      return SEM_NSEMS_MAX;

#else

      return -1;

#endif

    case _SC_SEM_VALUE_MAX:

#ifdef	SEM_VALUE_MAX

      return SEM_VALUE_MAX;

#else

      return -1;

#endif

    case _SC_SIGQUEUE_MAX:

#ifdef	SIGQUEUE_MAX

      return SIGQUEUE_MAX;

#else

      return -1;

#endif

    case _SC_TIMER_MAX:

#ifdef	TIMER_MAX

      return TIMER_MAX;

#else

      return -1;

#endif

    case _SC_BC_BASE_MAX:

#ifdef	BC_BASE_MAX

      return BC_BASE_MAX;

#else

      return -1;

#endif

    case _SC_BC_DIM_MAX:

#ifdef	BC_DIM_MAX

      return BC_DIM_MAX;

#else

      return -1;

#endif

    case _SC_BC_SCALE_MAX:

#ifdef	BC_SCALE_MAX

      return BC_SCALE_MAX;

#else

      return -1;

#endif

    case _SC_BC_STRING_MAX:

#ifdef	BC_STRING_MAX

      return BC_STRING_MAX;

#else

      return -1;

#endif

    case _SC_COLL_WEIGHTS_MAX:

#ifdef	COLL_WEIGHTS_MAX

      return COLL_WEIGHTS_MAX;

#else

      return -1;

#endif

    case _SC_EXPR_NEST_MAX:

#ifdef	EXPR_NEST_MAX

      return EXPR_NEST_MAX;

#else

      return -1;

#endif

    case _SC_LINE_MAX:

#ifdef	LINE_MAX

      return LINE_MAX;

#else

      return -1;

#endif

    case _SC_RE_DUP_MAX:

#ifdef	RE_DUP_MAX

      return RE_DUP_MAX;

#else

      return -1;

#endif

    case _SC_CHARCLASS_NAME_MAX:

#ifdef	CHARCLASS_NAME_MAX

      return CHARCLASS_NAME_MAX;

#else

      return -1;

#endif

    case _SC_PII:

#if CONF_IS_DEFINED_SET (_POSIX_PII)

      return 1;

#else

      return -1;

#endif

    case _SC_PII_XTI:

#if CONF_IS_DEFINED_SET (_POSIX_PII_XTI)

      return 1;

#else

      return -1;

#endif

    case _SC_PII_SOCKET:

#if CONF_IS_DEFINED_SET (_POSIX_PII_SOCKET)

      return 1;

#else

      return -1;

#endif

    case _SC_PII_INTERNET:

#if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET)

      return 1;

#else

      return -1;

#endif

    case _SC_PII_OSI:

#if CONF_IS_DEFINED_SET (_POSIX_PII_OSI)

      return 1;

#else

      return -1;

#endif

    case _SC_POLL:

#if CONF_IS_DEFINED_SET (_POSIX_POLL)

      return 1;

#else

      return -1;

#endif

    case _SC_SELECT:

#if CONF_IS_DEFINED_SET (_POSIX_SELECT)

      return 1;

#else

      return -1;

#endif

      /* The same as _SC_IOV_MAX.  */

    case _SC_UIO_MAXIOV:

#ifdef	UIO_MAXIOV

      return UIO_MAXIOV;

#else

      return -1;

#endif

    case _SC_PII_INTERNET_STREAM:

#if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET_STREAM)

      return 1;

#else

      return -1;

#endif

    case _SC_PII_INTERNET_DGRAM:

#if CONF_IS_DEFINED_SET (_POSIX_PII_INTERNET_DGRAM)

      return 1;

#else

      return -1;

#endif

    case _SC_PII_OSI_COTS:

#if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_COTS)

      return 1;

#else

      return -1;

#endif

    case _SC_PII_OSI_CLTS:

#if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_CLTS)

      return 1;

#else

      return -1;

#endif

    case _SC_PII_OSI_M:

#if CONF_IS_DEFINED_SET (_POSIX_PII_OSI_M)

      return 1;

#else

      return -1;

#endif

    case _SC_T_IOV_MAX:

#ifdef	_T_IOV_MAX

      return _T_IOV_MAX;

#else

      return -1;

#endif

    case _SC_2_VERSION:

      return _POSIX2_VERSION;

    case _SC_2_C_BIND:

#ifdef	_POSIX2_C_BIND

      return _POSIX2_C_BIND;

#else

      return -1;

#endif

    case _SC_2_C_DEV:

#ifdef	_POSIX2_C_DEV

      return _POSIX2_C_DEV;

#else

      return -1;

#endif

    case _SC_2_C_VERSION:

#ifdef	_POSIX2_C_VERSION

      return _POSIX2_C_VERSION;

#else

      return -1;

#endif

    case _SC_2_FORT_DEV:

#ifdef	_POSIX2_FORT_DEV

      return _POSIX2_FORT_DEV;

#else

      return -1;

#endif

    case _SC_2_FORT_RUN:

#ifdef	_POSIX2_FORT_RUN

      return _POSIX2_FORT_RUN;

#else

      return -1;

#endif

    case _SC_2_LOCALEDEF:

#ifdef	_POSIX2_LOCALEDEF

      return _POSIX2_LOCALEDEF;

#else

      return -1;

#endif

    case _SC_2_SW_DEV:

#ifdef	_POSIX2_SW_DEV

      return _POSIX2_SW_DEV;

#else

      return -1;

#endif

    case _SC_2_CHAR_TERM:

#ifdef	_POSIX2_CHAR_TERM

      return _POSIX2_CHAR_TERM;

#else

      return -1;

#endif

    case _SC_2_UPE:

#ifdef	_POSIX2_UPE

      return _POSIX2_UPE;

#else

      return -1;

#endif

      /* POSIX 1003.1c (POSIX Threads).  */

    case _SC_THREADS:

#if CONF_IS_DEFINED_SET (_POSIX_THREADS)

      return _POSIX_THREADS;

#else

      return -1;

#endif

    case _SC_THREAD_SAFE_FUNCTIONS:

#if CONF_IS_DEFINED_SET (_POSIX_THREAD_SAFE_FUNCTIONS)

      return _POSIX_THREAD_SAFE_FUNCTIONS;

#else

      return -1;

#endif

    case _SC_GETGR_R_SIZE_MAX:

      return NSS_BUFLEN_GROUP;

    case _SC_GETPW_R_SIZE_MAX:

      return NSS_BUFLEN_PASSWD;

    case _SC_LOGIN_NAME_MAX:

#ifdef	LOGIN_NAME_MAX

      return LOGIN_NAME_MAX;

#else

      return -1;

#endif

    case _SC_TTY_NAME_MAX:

#ifdef	TTY_NAME_MAX

      return TTY_NAME_MAX;

#else

      return -1;

#endif

    case _SC_THREAD_DESTRUCTOR_ITERATIONS:

#if CONF_IS_DEFINED_SET (_POSIX_THREAD_DESTRUCTOR_ITERATIONS)

      return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;

#else

      return -1;

#endif

    case _SC_THREAD_KEYS_MAX:

#ifdef	PTHREAD_KEYS_MAX

      return PTHREAD_KEYS_MAX;

#else

      return -1;

#endif

    case _SC_THREAD_STACK_MIN:

#ifdef	PTHREAD_STACK_MIN

      return PTHREAD_STACK_MIN;

#else

      return -1;

#endif

    case _SC_THREAD_THREADS_MAX:

#ifdef	PTHREAD_THREADS_MAX

      return PTHREAD_THREADS_MAX;

#else

      return -1;

#endif

    case _SC_THREAD_ATTR_STACKADDR:

#if CONF_IS_DEFINED_SET (_POSIX_THREAD_ATTR_STACKADDR)

      return _POSIX_THREAD_ATTR_STACKADDR;

#else

      return -1;

#endif

    case _SC_THREAD_ATTR_STACKSIZE:

#if CONF_IS_DEFINED_SET (_POSIX_THREAD_ATTR_STACKSIZE)

      return _POSIX_THREAD_ATTR_STACKSIZE;

#else

      return -1;

#endif

    case _SC_THREAD_PRIORITY_SCHEDULING:

#if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIORITY_SCHEDULING)

      return _POSIX_THREAD_PRIORITY_SCHEDULING;

#else

      return -1;

#endif

    case _SC_THREAD_PRIO_INHERIT:

#if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIO_INHERIT)

      return _POSIX_THREAD_PRIO_INHERIT;

#else

      return -1;

#endif

    case _SC_THREAD_PRIO_PROTECT:

#if CONF_IS_DEFINED_SET (_POSIX_THREAD_PRIO_PROTECT)

      return _POSIX_THREAD_PRIO_PROTECT;

#else

      return -1;

#endif

    case _SC_THREAD_PROCESS_SHARED:

#if CONF_IS_DEFINED_SET (_POSIX_THREAD_PROCESS_SHARED)

      return _POSIX_THREAD_PROCESS_SHARED;

#else

      return -1;

#endif

    case _SC_NPROCESSORS_CONF:

      return __get_nprocs_conf ();

    case _SC_NPROCESSORS_ONLN:

      return __get_nprocs ();

    case _SC_PHYS_PAGES:

      return __get_phys_pages ();

    case _SC_AVPHYS_PAGES:

      return __get_avphys_pages ();

    case _SC_ATEXIT_MAX:

      /* We have no limit since we use lists.  */

      return INT_MAX;

    case _SC_PASS_MAX:

      /* We have no limit but since the return value might be used to

	 allocate a buffer we restrict the value.  */

      return BUFSIZ;

    case _SC_XOPEN_VERSION:

      return _XOPEN_VERSION;

    case _SC_XOPEN_XCU_VERSION:

      return _XOPEN_XCU_VERSION;

    case _SC_XOPEN_UNIX:

      return _XOPEN_UNIX;

    case _SC_XOPEN_CRYPT:

#ifdef	_XOPEN_CRYPT

      return _XOPEN_CRYPT;

#else

      return -1;

#endif

    case _SC_XOPEN_ENH_I18N:

#ifdef	_XOPEN_ENH_I18N

      return _XOPEN_ENH_I18N;

#else

      return -1;

#endif

    case _SC_XOPEN_SHM:

#ifdef	_XOPEN_SHM

      return _XOPEN_SHM;

#else

      return -1;

#endif

    case _SC_XOPEN_XPG2:

#ifdef	_XOPEN_XPG2

      return _XOPEN_XPG2;

#else

      return -1;

#endif

    case _SC_XOPEN_XPG3:

#ifdef	_XOPEN_XPG3

      return _XOPEN_XPG3;

#else

      return -1;

#endif

    case _SC_XOPEN_XPG4:

#ifdef	_XOPEN_XPG4

      return _XOPEN_XPG4;

#else

      return -1;

#endif

    case _SC_CHAR_BIT:

      return CHAR_BIT;

    case _SC_CHAR_MAX:

      return CHAR_MAX;

    case _SC_CHAR_MIN:

      return CHAR_MIN;

    case _SC_INT_MAX:

      return INT_MAX;

    case _SC_INT_MIN:

      return INT_MIN;

    case _SC_LONG_BIT:

      return sizeof (long int) * CHAR_BIT;

    case _SC_WORD_BIT:

      return sizeof (int) * CHAR_BIT;

    case _SC_MB_LEN_MAX:

      return MB_LEN_MAX;

    case _SC_NZERO:

      return NZERO;

    case _SC_SSIZE_MAX:

      return _POSIX_SSIZE_MAX;

    case _SC_SCHAR_MAX:

      return SCHAR_MAX;

    case _SC_SCHAR_MIN:

      return SCHAR_MIN;

    case _SC_SHRT_MAX:

      return SHRT_MAX;

    case _SC_SHRT_MIN:

      return SHRT_MIN;

    case _SC_UCHAR_MAX:

      return UCHAR_MAX;

    case _SC_UINT_MAX:

      return UINT_MAX;

    case _SC_ULONG_MAX:

      return ULONG_MAX;

    case _SC_USHRT_MAX:

      return USHRT_MAX;

    case _SC_NL_ARGMAX:

#ifdef	NL_ARGMAX

      return NL_ARGMAX;

#else

      return -1;

#endif

    case _SC_NL_LANGMAX:

#ifdef	NL_LANGMAX

      return NL_LANGMAX;

#else

      return -1;

#endif

    case _SC_NL_MSGMAX:

#ifdef	NL_MSGMAX

      return NL_MSGMAX;

#else

      return -1;

#endif

    case _SC_NL_NMAX:

#ifdef	NL_NMAX

      return NL_NMAX;

#else

      return -1;

#endif

    case _SC_NL_SETMAX:

#ifdef	NL_SETMAX

      return NL_SETMAX;

#else

      return -1;

#endif

    case _SC_NL_TEXTMAX:

#ifdef	NL_TEXTMAX

      return NL_TEXTMAX;

#else

      return -1;

#endif

#define START_ENV_GROUP(VERSION)		\

      /* Empty.  */

#define END_ENV_GROUP(VERSION)			\

      /* Empty.  */

#define KNOWN_ABSENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX)	\

    case _SC_##SC_PREFIX##_##SUFFIX:				\

      return _##ENV_PREFIX##_##SUFFIX;

#define KNOWN_PRESENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX)	\

    case _SC_##SC_PREFIX##_##SUFFIX:					\

      return _##ENV_PREFIX##_##SUFFIX;

#define UNKNOWN_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX)	\

    case _SC_##SC_PREFIX##_##SUFFIX:				\

      return __sysconf_check_spec (#SUFFIX);

#include <posix/posix-envs.def>

#undef START_ENV_GROUP

#undef END_ENV_GROUP

#undef KNOWN_ABSENT_ENVIRONMENT

#undef KNOWN_PRESENT_ENVIRONMENT

#undef UNKNOWN_ENVIRONMENT

    case _SC_XOPEN_LEGACY:

      return _XOPEN_LEGACY;

    case _SC_XOPEN_REALTIME:

#ifdef _XOPEN_REALTIME

      return _XOPEN_REALTIME;

#else

      return -1;

#endif

    case _SC_XOPEN_REALTIME_THREADS:

#ifdef _XOPEN_REALTIME_THREADS

      return _XOPEN_REALTIME_THREADS;

#else

      return -1;

#endif

    case _SC_ADVISORY_INFO:

#if CONF_IS_DEFINED_SET (_POSIX_ADVISORY_INFO)

      return _POSIX_ADVISORY_INFO;

#else

      return -1;

#endif

    case _SC_BARRIERS:

#if CONF_IS_DEFINED_SET (_POSIX_BARRIERS)

      return _POSIX_BARRIERS;

#else

      return -1;

#endif

    case _SC_BASE:

#if CONF_IS_DEFINED_SET (_POSIX_BASE)

      return _POSIX_BASE;

#else

      return -1;

#endif

    case _SC_C_LANG_SUPPORT:

#if CONF_IS_DEFINED_SET (_POSIX_C_LANG_SUPPORT)

      return _POSIX_C_LANG_SUPPORT;

#else

      return -1;

#endif

    case _SC_C_LANG_SUPPORT_R:

#if CONF_IS_DEFINED_SET (_POSIX_C_LANG_SUPPORT_R)

      return _POSIX_C_LANG_SUPPORT_R;

#else

      return -1;

#endif

    case _SC_CLOCK_SELECTION:

#if CONF_IS_DEFINED_SET (_POSIX_CLOCK_SELECTION)

      return _POSIX_CLOCK_SELECTION;

#else

      return -1;

#endif

    case _SC_CPUTIME:

#if CONF_IS_DEFINED_SET (_POSIX_CPUTIME)

      return _POSIX_CPUTIME;

#else