/posix/sysconf.c
C | 279 lines | 210 code | 49 blank | 20 comment | 1 complexity | 6f1d4ab5749a4b0db32893fd319aa3e6 MD5 | raw file
- /* Copyright (C) 1991-2020 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
- <https://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)