Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 1227 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/posix/sysconf.c b/REORG.TODO/sysdeps/posix/sysconf.c
new file mode 100644
index 0000000000..a95e1b3f05
--- /dev/null
+++ b/REORG.TODO/sysdeps/posix/sysconf.c
@@ -0,0 +1,1227 @@
+/* Copyright (C) 1991-2017 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 <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
+      return -1;
+#endif
+
+    case _SC_DEVICE_IO:
+#if CONF_IS_DEFINED_SET (_POSIX_DEVICE_IO)
+      return _POSIX_DEVICE_IO;
+#else
+      return -1;
+#endif
+    case _SC_DEVICE_SPECIFIC:
+#if CONF_IS_DEFINED_SET (_POSIX_DEVICE_SPECIFIC)
+      return _POSIX_DEVICE_SPECIFIC;
+#else
+      return -1;
+#endif
+    case _SC_DEVICE_SPECIFIC_R:
+#if CONF_IS_DEFINED_SET (_POSIX_DEVICE_SPECIFIC_R)
+      return _POSIX_DEVICE_SPECIFIC_R;
+#else
+      return -1;
+#endif
+
+    case _SC_FD_MGMT:
+#if CONF_IS_DEFINED_SET (_POSIX_FD_MGMT)
+      return _POSIX_FD_MGMT;
+#else
+      return -1;
+#endif
+
+    case _SC_FIFO:
+#if CONF_IS_DEFINED_SET (_POSIX_FIFO)
+      return _POSIX_FIFO;
+#else
+      return -1;
+#endif
+    case _SC_PIPE:
+#if CONF_IS_DEFINED_SET (_POSIX_PIPE)
+      return _POSIX_PIPE;
+#else
+      return -1;
+#endif
+
+    case _SC_FILE_ATTRIBUTES:
+#if CONF_IS_DEFINED_SET (_POSIX_FILE_ATTRIBUTES)
+      return _POSIX_FILE_ATTRIBUTES;
+#else
+      return -1;
+#endif
+    case _SC_FILE_LOCKING:
+#if CONF_IS_DEFINED_SET (_POSIX_FILE_LOCKING)
+      return _POSIX_FILE_LOCKING;
+#else
+      return -1;
+#endif
+    case _SC_FILE_SYSTEM:
+#if CONF_IS_DEFINED_SET (_POSIX_FILE_SYSTEM)
+      return _POSIX_FILE_SYSTEM;
+#else
+      return -1;
+#endif
+
+    case _SC_MONOTONIC_CLOCK:
+#if CONF_IS_DEFINED_SET (_POSIX_MONOTONIC_CLOCK)
+      return _POSIX_MONOTONIC_CLOCK;
+#else
+      return -1;
+#endif
+
+    case _SC_MULTI_PROCESS:
+#if CONF_IS_DEFINED_SET (_POSIX_MULTI_PROCESS)
+      return _POSIX_MULTI_PROCESS;
+#else
+      return -1;
+#endif
+    case _SC_SINGLE_PROCESS:
+#if CONF_IS_DEFINED_SET (_POSIX_SINGLE_PROCESS)
+      return _POSIX_SINGLE_PROCESS;
+#else
+      return -1;
+#endif
+
+    case _SC_NETWORKING:
+#if CONF_IS_DEFINED_SET (_POSIX_NETWORKING)
+      return _POSIX_NETWORKING;
+#else
+      return -1;
+#endif
+
+    case _SC_READER_WRITER_LOCKS:
+#if CONF_IS_DEFINED_SET (_POSIX_READER_WRITER_LOCKS)
+      return _POSIX_READER_WRITER_LOCKS;
+#else
+      return -1;
+#endif
+    case _SC_SPIN_LOCKS:
+#if CONF_IS_DEFINED_SET (_POSIX_SPIN_LOCKS)
+      return _POSIX_SPIN_LOCKS;
+#else
+      return -1;
+#endif
+
+    case _SC_REGEXP:
+#if CONF_IS_DEFINED_SET (_POSIX_REGEXP)
+      return _POSIX_REGEXP;
+#else
+      return -1;
+#endif
+    /* _REGEX_VERSION has been removed with IEEE Std 1003.1-2001/Cor 2-2004,
+       item XSH/TC2/D6/137.  */
+    case _SC_REGEX_VERSION:
+      return -1;
+
+    case _SC_SHELL:
+#if CONF_IS_DEFINED_SET (_POSIX_SHELL)
+      return _POSIX_SHELL;
+#else
+      return -1;
+#endif
+
+    case _SC_SIGNALS:
+#if CONF_IS_DEFINED (_POSIX_SIGNALS)
+      return _POSIX_SIGNALS;
+#else
+      return -1;
+#endif
+
+    case _SC_SPAWN:
+#if CONF_IS_DEFINED_SET (_POSIX_SPAWN)
+      return _POSIX_SPAWN;
+#else
+      return -1;
+#endif
+
+    case _SC_SPORADIC_SERVER:
+#if CONF_IS_DEFINED_SET (_POSIX_SPORADIC_SERVER)
+      return _POSIX_SPORADIC_SERVER;
+#else
+      return -1;
+#endif
+    case _SC_THREAD_SPORADIC_SERVER:
+#if CONF_IS_DEFINED_SET (_POSIX_THREAD_SPORADIC_SERVER)
+      return _POSIX_THREAD_SPORADIC_SERVER;
+#else
+      return -1;
+#endif
+
+    case _SC_SYSTEM_DATABASE:
+#if CONF_IS_DEFINED_SET (_POSIX_SYSTEM_DATABASE)
+      return _POSIX_SYSTEM_DATABASE;
+#else
+      return -1;
+#endif
+    case _SC_SYSTEM_DATABASE_R:
+#if CONF_IS_DEFINED_SET (_POSIX_SYSTEM_DATABASE_R)
+      return _POSIX_SYSTEM_DATABASE_R;
+#else
+      return -1;
+#endif
+
+    case _SC_THREAD_CPUTIME:
+#if CONF_IS_DEFINED_SET (_POSIX_THREAD_CPUTIME)
+      return _POSIX_THREAD_CPUTIME;
+#else
+      return -1;
+#endif
+
+    case _SC_TIMEOUTS:
+#if CONF_IS_DEFINED_SET (_POSIX_TIMEOUTS)
+      return _POSIX_TIMEOUTS;
+#else
+      return -1;
+#endif
+
+    case _SC_TYPED_MEMORY_OBJECTS:
+#if CONF_IS_DEFINED_SET (_POSIX_TYPED_MEMORY_OBJECTS)
+      return _POSIX_TYPED_MEMORY_OBJECTS;
+#else
+      return -1;
+#endif
+
+    case _SC_USER_GROUPS:
+#if CONF_IS_DEFINED_SET (_POSIX_USER_GROUPS)
+      return _POSIX_USER_GROUPS;
+#else
+      return -1;
+#endif
+    case _SC_USER_GROUPS_R:
+#if CONF_IS_DEFINED_SET (_POSIX_USER_GROUPS_R)
+      return _POSIX_USER_GROUPS_R;
+#else
+      return -1;
+#endif
+
+    case _SC_2_PBS:
+#ifdef _POSIX2_PBS
+      return _POSIX2_PBS;
+#else
+      return -1;
+#endif
+    case _SC_2_PBS_ACCOUNTING:
+#ifdef _POSIX2_PBS_ACCOUNTING
+      return _POSIX2_PBS_ACCOUNTING;
+#else
+      return -1;
+#endif
+    case _SC_2_PBS_CHECKPOINT:
+#ifdef _POSIX2_PBS_CHECKPOINT
+      return _POSIX2_PBS_CHECKPOINT;
+#else
+      return -1;
+#endif
+    case _SC_2_PBS_LOCATE:
+#ifdef _POSIX2_PBS_LOCATE
+      return _POSIX2_PBS_LOCATE;
+#else
+      return -1;
+#endif
+    case _SC_2_PBS_MESSAGE:
+#ifdef _POSIX2_PBS_MESSAGE
+      return _POSIX2_PBS_MESSAGE;
+#else
+      return -1;
+#endif
+    case _SC_2_PBS_TRACK:
+#ifdef _POSIX2_PBS_TRACK
+      return _POSIX2_PBS_TRACK;
+#else
+      return -1;
+#endif
+
+    case _SC_SYMLOOP_MAX:
+#ifdef SYMLOOP_MAX
+      return SYMLOOP_MAX;
+#else
+      return -1;
+#endif
+
+    case _SC_STREAMS:
+#ifdef _XOPEN_STREAMS
+      return _XOPEN_STREAMS;
+#else
+      return -1;
+#endif
+
+    case _SC_HOST_NAME_MAX:
+#ifdef HOST_NAME_MAX
+      return HOST_NAME_MAX;
+#else
+      return -1;
+#endif
+
+    case _SC_TRACE:
+#if CONF_IS_DEFINED_SET (_POSIX_TRACE)
+      return _POSIX_TRACE;
+#else
+      return -1;
+#endif
+    case _SC_TRACE_EVENT_FILTER:
+#if CONF_IS_DEFINED_SET (_POSIX_TRACE_EVENT_FILTER)
+      return _POSIX_TRACE_EVENT_FILTER;
+#else
+      return -1;
+#endif
+    case _SC_TRACE_INHERIT:
+#if CONF_IS_DEFINED_SET (_POSIX_TRACE_INHERIT)
+      return _POSIX_TRACE_INHERIT;
+#else
+      return -1;
+#endif
+    case _SC_TRACE_LOG:
+#if CONF_IS_DEFINED_SET (_POSIX_TRACE_LOG)
+      return _POSIX_TRACE_LOG;
+#else
+      return -1;
+#endif
+
+    case _SC_TRACE_EVENT_NAME_MAX:
+    case _SC_TRACE_NAME_MAX:
+    case _SC_TRACE_SYS_MAX:
+    case _SC_TRACE_USER_EVENT_MAX:
+      /* No support for tracing.  */
+
+    case _SC_XOPEN_STREAMS:
+      /* No support for STREAMS.  */
+      return -1;
+
+    case _SC_LEVEL1_ICACHE_SIZE:
+    case _SC_LEVEL1_ICACHE_ASSOC:
+    case _SC_LEVEL1_ICACHE_LINESIZE:
+    case _SC_LEVEL1_DCACHE_SIZE:
+    case _SC_LEVEL1_DCACHE_ASSOC:
+    case _SC_LEVEL1_DCACHE_LINESIZE:
+    case _SC_LEVEL2_CACHE_SIZE:
+    case _SC_LEVEL2_CACHE_ASSOC:
+    case _SC_LEVEL2_CACHE_LINESIZE:
+    case _SC_LEVEL3_CACHE_SIZE:
+    case _SC_LEVEL3_CACHE_ASSOC:
+    case _SC_LEVEL3_CACHE_LINESIZE:
+    case _SC_LEVEL4_CACHE_SIZE:
+    case _SC_LEVEL4_CACHE_ASSOC:
+    case _SC_LEVEL4_CACHE_LINESIZE:
+      /* In general we cannot determine these values.  Therefore we
+	 return zero which indicates that no information is
+	 available.  */
+      return 0;
+
+    case _SC_IPV6:
+#if CONF_IS_DEFINED_SET (_POSIX_IPV6)
+      return _POSIX_IPV6;
+#else
+      return -1;
+#endif
+
+    case _SC_RAW_SOCKETS:
+#if CONF_IS_DEFINED_SET (_POSIX_RAW_SOCKETS)
+      return _POSIX_RAW_SOCKETS;
+#else
+      return -1;
+#endif
+    }
+}
+
+#undef __sysconf
+weak_alias (__sysconf, sysconf)
+libc_hidden_def (__sysconf)
+
+#if NEED_CHECK_SPEC
+static long int
+__sysconf_check_spec (const char *spec)
+{
+  int save_errno = errno;
+
+  const char *getconf_dir = __libc_secure_getenv ("GETCONF_DIR") ?: GETCONF_DIR;
+  size_t getconf_dirlen = strlen (getconf_dir);
+  size_t speclen = strlen (spec);
+
+  char name[getconf_dirlen + sizeof ("/POSIX_V6_") + speclen];
+  memcpy (mempcpy (mempcpy (name, getconf_dir, getconf_dirlen),
+		   "/POSIX_V6_", sizeof ("/POSIX_V6_") - 1),
+	  spec, speclen + 1);
+
+  struct stat64 st;
+  long int ret = __xstat64 (_STAT_VER, name, &st) >= 0 ? 1 : -1;
+
+  __set_errno (save_errno);
+  return ret;
+}
+#endif