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glibc/sysdeps/posix/sysconf.c

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/* Copyright (C) 1991, 1993, 1995, 1996, 1997 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <limits.h>
#include <grp.h>
#include <pwd.h>
#include <stddef.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <sys/sysinfo.h>
/* Get the value of the system variable NAME. */
long int
__sysconf (name)
int name;
{
switch (name)
{
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 -1;
#endif
case _SC_CLK_TCK:
#ifdef CLK_TCK
return CLK_TCK;
#else
return 60;
#endif
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 __tzname_max ();
case _SC_JOB_CONTROL:
#ifdef _POSIX_JOB_CONTROL
return 1;
#else
return -1;
#endif
case _SC_SAVED_IDS:
#ifdef _POSIX_SAVED_IDS
return 1;
#else
return -1;
#endif
case _SC_REALTIME_SIGNALS:
#ifdef _POSIX_REALTIME_SIGNALS
return 1;
#else
return -1;
#endif
case _SC_PRIORITY_SCHEDULING:
#ifdef _POSIX_PRIORITY_SCHEDULING
return 1;
#else
return -1;
#endif
case _SC_TIMERS:
#ifdef _POSIX_TIMERS
return 1;
#else
return -1;
#endif
case _SC_ASYNCHRONOUS_IO:
#ifdef _POSIX_ASYNCHRONOUS_IO
return 1;
#else
return -1;
#endif
case _SC_PRIORITIZED_IO:
#ifdef _POSIX_PRIORITIZED_IO
return 1;
#else
return -1;
#endif
case _SC_SYNCHRONIZED_IO:
#ifdef _POSIX_SYNCHRONIZED_IO
return 1;
#else
return -1;
#endif
case _SC_FSYNC:
#ifdef _POSIX_FSYNC
return 1;
#else
return -1;
#endif
case _SC_MAPPED_FILES:
#ifdef _POSIX_MAPPED_FILES
return 1;
#else
return -1;
#endif
case _SC_MEMLOCK:
#ifdef _POSIX_MEMLOCK
return 1;
#else
return -1;
#endif
case _SC_MEMLOCK_RANGE:
#ifdef _POSIX_MEMLOCK_RANGE
return 1;
#else
return -1;
#endif
case _SC_MEMORY_PROTECTION:
#ifdef _POSIX_MEMORY_PROTECTION
return 1;
#else
return -1;
#endif
case _SC_MESSAGE_PASSING:
#ifdef _POSIX_MESSAGE_PASSING
return 1;
#else
return -1;
#endif
case _SC_SEMAPHORES:
#ifdef _POSIX_SEMAPHORES
return 1;
#else
return -1;
#endif
case _SC_SHARED_MEMORY_OBJECTS:
#ifdef _POSIX_SHARED_MEMORY_OBJECTS
return 1;
#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_EQUIV_CLASS_MAX:
#ifdef EQUIV_CLASS_MAX
return EQUIV_CLASS_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:
#ifdef _POSIX_PII
return 1;
#else
return -1;
#endif
case _SC_PII_XTI:
#ifdef _POSIX_PII_XTI
return 1;
#else
return -1;
#endif
case _SC_PII_SOCKET:
#ifdef _POSIX_PII_SOCKET
return 1;
#else
return -1;
#endif
case _SC_PII_INTERNET:
#ifdef _POSIX_PII_INTERNET
return 1;
#else
return -1;
#endif
case _SC_PII_OSI:
#ifdef _POSIX_PII_OSI
return 1;
#else
return -1;
#endif
case _SC_POLL:
#ifdef _POSIX_POLL
return 1;
#else
return -1;
#endif
case _SC_SELECT:
#ifdef _POSIX_SELECT
return 1;
#else
return -1;
#endif
case _SC_UIO_MAXIOV:
#ifdef UIO_MAXIOV
return UIO_MAXIOV;
#else
return -1;
#endif
case _SC_PII_INTERNET_STREAM:
#ifdef _POSIX_PII_INTERNET_STREAM
return 1;
#else
return -1;
#endif
case _SC_PII_INTERNET_DGRAM:
#ifdef _POSIX_PII_INTERNET_DGRAM
return 1;
#else
return -1;
#endif
case _SC_PII_OSI_COTS:
#ifdef _POSIX_PII_OSI_COTS
return 1;
#else
return -1;
#endif
case _SC_PII_OSI_CLTS:
#ifdef _POSIX_PII_OSI_CLTS
return 1;
#else
return -1;
#endif
case _SC_PII_OSI_M:
#ifdef _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_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:
#ifdef _POSIX_THREADS
return 1;
#else
return -1;
#endif
case _SC_THREAD_SAFE_FUNCTIONS:
#ifdef _POSIX_THREAD_SAFE_FUNCTIONS
return 1;
#else
return -1;
#endif
case _SC_GETGR_R_SIZE_MAX:
#ifdef NSS_BUFLEN_GROUP
return NSS_BUFLEN_GROUP;
#else
return -1;
#endif
case _SC_GETPW_R_SIZE_MAX:
#ifdef NSS_BUFLEN_PASSWD
return NSS_BUFLEN_PASSWD;
#else
return -1;
#endif
case _SC_LOGIN_NAME_MAX:
#ifdef _POSIX_LOGIN_NAME_MAX
return _POSIX_LOGIN_NAME_MAX;
#else
return -1;
#endif
case _SC_TTY_NAME_MAX:
#ifdef _POSIX_TTY_NAME_MAX
return _POSIX_TTY_NAME_MAX;
#else
return -1;
#endif
case _SC_THREAD_DESTRUCTOR_ITERATIONS:
#ifdef _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:
#ifdef _POSIX_THREAD_ATTR_STACKADDR
return 1;
#else
return -1;
#endif
case _SC_THREAD_ATTR_STACKSIZE:
#ifdef _POSIX_THREAD_ATTR_STACKSIZE
return 1;
#else
return -1;
#endif
case _SC_THREAD_PRIORITY_SCHEDULING:
#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
return 1;
#else
return -1;
#endif
case _SC_THREAD_PRIO_INHERIT:
#ifdef _POSIX_THREAD_PRIO_INHERIT
return 1;
#else
return -1;
#endif
case _SC_THREAD_PRIO_PROTECT:
#ifdef _POSIX_THREAD_PRIO_PROTECT
return 1;
#else
return -1;
#endif
case _SC_THREAD_PROCESS_SHARED:
#ifdef _POSIX_THREAD_PROCESS_SHARED
return 1;
#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
case _SC_XBS5_ILP32_OFF32:
#ifdef _XBS5_ILP32_OFF32
return _XBS5_ILP32_OFF32;
#else
return -1;
#endif
case _SC_XBS5_ILP32_OFFBIG:
#ifdef _XBS5_ILP32_OFFBIG
return _XBS5_ILP32_OFFBIG;
#else
return -1;
#endif
case _SC_XBS5_LP64_OFF64:
#ifdef _XBS5_LP64_OFF64
return _XBS5_LP64_OFF64;
#else
return -1;
#endif
case _SC_XBS5_LPBIG_OFFBIG:
#ifdef _XBS5_LPBIG_OFFBIG
return _XBS5_LPBIG_OFFBIG;
#else
return -1;
#endif
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
}
}
weak_alias (__sysconf, sysconf)
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