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glibc/posix/sysconf.c

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/* Copyright (C) 1991-2019 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 <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include <limits.h>
#include <sys/param.h>
#include <sys/sysinfo.h>
/* Get the value of the system variable NAME. */
long int
__sysconf (int name)
{
switch (name)
{
default:
__set_errno (EINVAL);
return -1;
case _SC_TZNAME_MAX:
return -1;
case _SC_CHARCLASS_NAME_MAX:
#ifdef CHARCLASS_NAME_MAX
return CHARCLASS_NAME_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_2_LOCALEDEF:
#ifdef _POSIX2_LOCALEDEF
return _POSIX2_LOCALEDEF;
#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_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_GETGR_R_SIZE_MAX:
return NSS_BUFLEN_GROUP;
case _SC_GETPW_R_SIZE_MAX:
return NSS_BUFLEN_PASSWD;
case _SC_ARG_MAX:
case _SC_CHILD_MAX:
case _SC_CLK_TCK:
case _SC_NGROUPS_MAX:
case _SC_OPEN_MAX:
case _SC_STREAM_MAX:
case _SC_JOB_CONTROL:
case _SC_SAVED_IDS:
case _SC_REALTIME_SIGNALS:
case _SC_PRIORITY_SCHEDULING:
case _SC_TIMERS:
case _SC_ASYNCHRONOUS_IO:
case _SC_PRIORITIZED_IO:
case _SC_SYNCHRONIZED_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_SEMAPHORES:
case _SC_SHARED_MEMORY_OBJECTS:
case _SC_AIO_LISTIO_MAX:
case _SC_AIO_MAX:
case _SC_AIO_PRIO_DELTA_MAX:
case _SC_DELAYTIMER_MAX:
case _SC_MQ_OPEN_MAX:
case _SC_MQ_PRIO_MAX:
case _SC_VERSION:
case _SC_PAGESIZE:
case _SC_RTSIG_MAX:
case _SC_SEM_NSEMS_MAX:
case _SC_SEM_VALUE_MAX:
case _SC_SIGQUEUE_MAX:
case _SC_TIMER_MAX:
case _SC_PII:
case _SC_PII_XTI:
case _SC_PII_SOCKET:
case _SC_PII_OSI:
case _SC_POLL:
case _SC_SELECT:
case _SC_UIO_MAXIOV:
case _SC_PII_INTERNET_STREAM:
case _SC_PII_INTERNET_DGRAM:
case _SC_PII_OSI_COTS:
case _SC_PII_OSI_CLTS:
case _SC_PII_OSI_M:
case _SC_T_IOV_MAX:
case _SC_BC_BASE_MAX:
case _SC_BC_DIM_MAX:
case _SC_BC_SCALE_MAX:
case _SC_BC_STRING_MAX:
case _SC_EXPR_NEST_MAX:
case _SC_LINE_MAX:
case _SC_RE_DUP_MAX:
case _SC_2_VERSION:
case _SC_2_C_BIND:
case _SC_2_C_DEV:
case _SC_2_FORT_DEV:
case _SC_2_SW_DEV:
case _SC_2_CHAR_TERM:
case _SC_2_C_VERSION:
case _SC_2_UPE:
case _SC_THREADS:
case _SC_THREAD_SAFE_FUNCTIONS:
case _SC_LOGIN_NAME_MAX:
case _SC_TTY_NAME_MAX:
case _SC_THREAD_DESTRUCTOR_ITERATIONS:
case _SC_THREAD_KEYS_MAX:
case _SC_THREAD_STACK_MIN:
case _SC_THREAD_THREADS_MAX:
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_XOPEN_VERSION:
case _SC_XOPEN_XCU_VERSION:
case _SC_XOPEN_UNIX:
case _SC_XOPEN_CRYPT:
case _SC_XOPEN_ENH_I18N:
case _SC_XOPEN_SHM:
case _SC_XOPEN_XPG2:
case _SC_XOPEN_XPG3:
case _SC_XOPEN_XPG4:
case _SC_NL_ARGMAX:
case _SC_NL_LANGMAX:
case _SC_NL_MSGMAX:
case _SC_NL_NMAX:
case _SC_NL_SETMAX:
case _SC_NL_TEXTMAX:
case _SC_XBS5_ILP32_OFF32:
case _SC_XBS5_ILP32_OFFBIG:
case _SC_XBS5_LP64_OFF64:
case _SC_XBS5_LPBIG_OFFBIG:
case _SC_POSIX_V6_ILP32_OFF32:
case _SC_POSIX_V6_ILP32_OFFBIG:
case _SC_POSIX_V6_LP64_OFF64:
case _SC_POSIX_V6_LPBIG_OFFBIG:
case _SC_POSIX_V7_ILP32_OFF32:
case _SC_POSIX_V7_ILP32_OFFBIG:
case _SC_POSIX_V7_LP64_OFF64:
case _SC_POSIX_V7_LPBIG_OFFBIG:
case _SC_XOPEN_LEGACY:
case _SC_XOPEN_REALTIME:
case _SC_XOPEN_REALTIME_THREADS:
break;
}
__set_errno (ENOSYS);
return -1;
}
weak_alias (__sysconf, sysconf)
libc_hidden_def (__sysconf)
stub_warning (sysconf)
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