/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Sean Eric Fagan of Cygnus Support. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94"; #endif /* LIBC_SCCS and not lint */ #include __FBSDID("$FreeBSD$"); #include "namespace.h" #include #include #include #include #include #include #include #include #include #include /* we just need the limits */ #include #include #include #include "un-namespace.h" #include "../stdlib/atexit.h" #include "tzfile.h" /* from ../../../contrib/tzcode/stdtime */ #include "libc_private.h" #define _PATH_ZONEINFO TZDIR /* from tzfile.h */ /* * sysconf -- * get configurable system variables. * * XXX * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values * not change during the lifetime of the calling process. This would seem * to require that any change to system limits kill all running processes. * A workaround might be to cache the values when they are first retrieved * and then simply return the cached value on subsequent calls. This is * less useful than returning up-to-date values, however. */ long sysconf(int name) { struct rlimit rl; size_t len; int mib[2], sverrno, value; long lvalue, defaultresult; const char *path; defaultresult = -1; switch (name) { case _SC_ARG_MAX: mib[0] = CTL_KERN; mib[1] = KERN_ARGMAX; break; case _SC_CHILD_MAX: if (getrlimit(RLIMIT_NPROC, &rl) != 0) return (-1); if (rl.rlim_cur == RLIM_INFINITY) return (-1); if (rl.rlim_cur > LONG_MAX) { errno = EOVERFLOW; return (-1); } return ((long)rl.rlim_cur); case _SC_CLK_TCK: return (CLK_TCK); case _SC_NGROUPS_MAX: mib[0] = CTL_KERN; mib[1] = KERN_NGROUPS; break; case _SC_OPEN_MAX: if (getrlimit(RLIMIT_NOFILE, &rl) != 0) return (-1); if (rl.rlim_cur == RLIM_INFINITY) return (-1); if (rl.rlim_cur > LONG_MAX) { errno = EOVERFLOW; return (-1); } return ((long)rl.rlim_cur); case _SC_STREAM_MAX: if (getrlimit(RLIMIT_NOFILE, &rl) != 0) return (-1); if (rl.rlim_cur == RLIM_INFINITY) return (-1); if (rl.rlim_cur > LONG_MAX) { errno = EOVERFLOW; return (-1); } /* * struct __sFILE currently has a limitation that * file descriptors must fit in a signed short. * This doesn't precisely capture the letter of POSIX * but approximates the spirit. */ if (rl.rlim_cur > SHRT_MAX) return (SHRT_MAX); return ((long)rl.rlim_cur); case _SC_JOB_CONTROL: return (_POSIX_JOB_CONTROL); case _SC_SAVED_IDS: /* XXX - must be 1 */ mib[0] = CTL_KERN; mib[1] = KERN_SAVED_IDS; goto yesno; case _SC_VERSION: mib[0] = CTL_KERN; mib[1] = KERN_POSIX1; break; case _SC_BC_BASE_MAX: return (BC_BASE_MAX); case _SC_BC_DIM_MAX: return (BC_DIM_MAX); case _SC_BC_SCALE_MAX: return (BC_SCALE_MAX); case _SC_BC_STRING_MAX: return (BC_STRING_MAX); case _SC_COLL_WEIGHTS_MAX: return (COLL_WEIGHTS_MAX); case _SC_EXPR_NEST_MAX: return (EXPR_NEST_MAX); case _SC_LINE_MAX: return (LINE_MAX); case _SC_RE_DUP_MAX: return (RE_DUP_MAX); case _SC_2_VERSION: /* * This is something of a lie, but it would be silly at * this point to try to deduce this from the contents * of the filesystem. */ return (_POSIX2_VERSION); case _SC_2_C_BIND: return (_POSIX2_C_BIND); case _SC_2_C_DEV: return (_POSIX2_C_DEV); case _SC_2_CHAR_TERM: return (_POSIX2_CHAR_TERM); case _SC_2_FORT_DEV: return (_POSIX2_FORT_DEV); case _SC_2_FORT_RUN: return (_POSIX2_FORT_RUN); case _SC_2_LOCALEDEF: return (_POSIX2_LOCALEDEF); case _SC_2_SW_DEV: return (_POSIX2_SW_DEV); case _SC_2_UPE: return (_POSIX2_UPE); case _SC_TZNAME_MAX: path = _PATH_ZONEINFO; do_NAME_MAX: sverrno = errno; errno = 0; lvalue = pathconf(path, _PC_NAME_MAX); if (lvalue == -1 && errno != 0) return (-1); errno = sverrno; return (lvalue); case _SC_ASYNCHRONOUS_IO: #if _POSIX_ASYNCHRONOUS_IO == 0 mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO; break; #else return (_POSIX_ASYNCHRONOUS_IO); #endif case _SC_MAPPED_FILES: return (_POSIX_MAPPED_FILES); case _SC_MEMLOCK: return (_POSIX_MEMLOCK); case _SC_MEMLOCK_RANGE: return (_POSIX_MEMLOCK_RANGE); case _SC_MEMORY_PROTECTION: return (_POSIX_MEMORY_PROTECTION); case _SC_MESSAGE_PASSING: #if _POSIX_MESSAGE_PASSING == 0 mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_MESSAGE_PASSING; goto yesno; #else return (_POSIX_MESSAGE_PASSING); #endif case _SC_PRIORITIZED_IO: #if _POSIX_PRIORITIZED_IO == 0 mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_PRIORITIZED_IO; goto yesno; #else return (_POSIX_PRIORITIZED_IO); #endif case _SC_PRIORITY_SCHEDULING: #if _POSIX_PRIORITY_SCHEDULING == 0 mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING; goto yesno; #else return (_POSIX_PRIORITY_SCHEDULING); #endif case _SC_REALTIME_SIGNALS: #if _POSIX_REALTIME_SIGNALS == 0 mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_REALTIME_SIGNALS; goto yesno; #else return (_POSIX_REALTIME_SIGNALS); #endif case _SC_SEMAPHORES: #if _POSIX_SEMAPHORES == 0 mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_SEMAPHORES; goto yesno; #else return (_POSIX_SEMAPHORES); #endif case _SC_FSYNC: return (_POSIX_FSYNC); case _SC_SHARED_MEMORY_OBJECTS: return (_POSIX_SHARED_MEMORY_OBJECTS); case _SC_SYNCHRONIZED_IO: #if _POSIX_SYNCHRONIZED_IO == 0 mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO; goto yesno; #else return (_POSIX_SYNCHRONIZED_IO); #endif case _SC_TIMERS: #if _POSIX_TIMERS == 0 mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_TIMERS; goto yesno; #else return (_POSIX_TIMERS); #endif case _SC_AIO_LISTIO_MAX: mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX; break; case _SC_AIO_MAX: mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_AIO_MAX; break; case _SC_AIO_PRIO_DELTA_MAX: mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX; break; case _SC_DELAYTIMER_MAX: mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_DELAYTIMER_MAX; goto yesno; case _SC_MQ_OPEN_MAX: mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_MQ_OPEN_MAX; goto yesno; case _SC_PAGESIZE: defaultresult = getpagesize(); mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_PAGESIZE; goto yesno; case _SC_RTSIG_MAX: mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_RTSIG_MAX; goto yesno; case _SC_SEM_NSEMS_MAX: return (-1); case _SC_SEM_VALUE_MAX: return (SEM_VALUE_MAX); case _SC_SIGQUEUE_MAX: mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_SIGQUEUE_MAX; goto yesno; case _SC_TIMER_MAX: mib[0] = CTL_P1003_1B; mib[1] = CTL_P1003_1B_TIMER_MAX; yesno: len = sizeof(value); if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) return (-1); if (value == 0) return (defaultresult); return ((long)value); case _SC_2_PBS: case _SC_2_PBS_ACCOUNTING: case _SC_2_PBS_CHECKPOINT: case _SC_2_PBS_LOCATE: case _SC_2_PBS_MESSAGE: case _SC_2_PBS_TRACK: #if _POSIX2_PBS == 0 #error "don't know how to determine _SC_2_PBS" /* * This probably requires digging through the filesystem * to see if the appropriate package has been installed. * Since we don't currently support this option at all, * it's not worth the effort to write the code now. * Figuring out which of the sub-options are supported * would be even more difficult, so it's probably easier * to always say ``no''. */ #else return (_POSIX2_PBS); #endif case _SC_ADVISORY_INFO: #if _POSIX_ADVISORY_INFO == 0 #error "_POSIX_ADVISORY_INFO" #else return (_POSIX_ADVISORY_INFO); #endif case _SC_BARRIERS: #if _POSIX_BARRIERS == 0 #error "_POSIX_BARRIERS" #else return (_POSIX_BARRIERS); #endif case _SC_CLOCK_SELECTION: #if _POSIX_CLOCK_SELECTION == 0 #error "_POSIX_CLOCK_SELECTION" #else return (_POSIX_CLOCK_SELECTION); #endif case _SC_CPUTIME: return (_POSIX_CPUTIME); #ifdef notdef case _SC_FILE_LOCKING: /* * XXX - The standard doesn't tell us how to define * _POSIX_FILE_LOCKING, so we can't answer this one. */ #endif /* * SUSv4tc1 says the following about _SC_GETGR_R_SIZE_MAX and * _SC_GETPW_R_SIZE_MAX: * Note that sysconf(_SC_GETGR_R_SIZE_MAX) may return -1 if * there is no hard limit on the size of the buffer needed to * store all the groups returned. */ case _SC_GETGR_R_SIZE_MAX: case _SC_GETPW_R_SIZE_MAX: return (-1); case _SC_HOST_NAME_MAX: return (MAXHOSTNAMELEN - 1); /* does not include \0 */ case _SC_LOGIN_NAME_MAX: return (MAXLOGNAME); case _SC_MONOTONIC_CLOCK: #if _POSIX_MONOTONIC_CLOCK == 0 #error "_POSIX_MONOTONIC_CLOCK" #else return (_POSIX_MONOTONIC_CLOCK); #endif #if _POSIX_MESSAGE_PASSING > -1 case _SC_MQ_PRIO_MAX: return (MQ_PRIO_MAX); #endif case _SC_READER_WRITER_LOCKS: return (_POSIX_READER_WRITER_LOCKS); case _SC_REGEXP: return (_POSIX_REGEXP); case _SC_SHELL: return (_POSIX_SHELL); case _SC_SPAWN: return (_POSIX_SPAWN); case _SC_SPIN_LOCKS: return (_POSIX_SPIN_LOCKS); case _SC_SPORADIC_SERVER: #if _POSIX_SPORADIC_SERVER == 0 #error "_POSIX_SPORADIC_SERVER" #else return (_POSIX_SPORADIC_SERVER); #endif case _SC_THREAD_ATTR_STACKADDR: return (_POSIX_THREAD_ATTR_STACKADDR); case _SC_THREAD_ATTR_STACKSIZE: return (_POSIX_THREAD_ATTR_STACKSIZE); case _SC_THREAD_CPUTIME: return (_POSIX_THREAD_CPUTIME); case _SC_THREAD_DESTRUCTOR_ITERATIONS: return (PTHREAD_DESTRUCTOR_ITERATIONS); case _SC_THREAD_KEYS_MAX: return (PTHREAD_KEYS_MAX); case _SC_THREAD_PRIO_INHERIT: return (_POSIX_THREAD_PRIO_INHERIT); case _SC_THREAD_PRIO_PROTECT: return (_POSIX_THREAD_PRIO_PROTECT); case _SC_THREAD_PRIORITY_SCHEDULING: return (_POSIX_THREAD_PRIORITY_SCHEDULING); case _SC_THREAD_PROCESS_SHARED: return (_POSIX_THREAD_PROCESS_SHARED); case _SC_THREAD_SAFE_FUNCTIONS: return (_POSIX_THREAD_SAFE_FUNCTIONS); case _SC_THREAD_STACK_MIN: return (PTHREAD_STACK_MIN); case _SC_THREAD_THREADS_MAX: return (PTHREAD_THREADS_MAX); /* XXX wrong type! */ case _SC_TIMEOUTS: return (_POSIX_TIMEOUTS); case _SC_THREADS: return (_POSIX_THREADS); case _SC_TRACE: #if _POSIX_TRACE == 0 #error "_POSIX_TRACE" /* While you're implementing this, also do the ones below. */ #else return (_POSIX_TRACE); #endif #if _POSIX_TRACE > -1 case _SC_TRACE_EVENT_FILTER: return (_POSIX_TRACE_EVENT_FILTER); case _SC_TRACE_INHERIT: return (_POSIX_TRACE_INHERIT); case _SC_TRACE_LOG: return (_POSIX_TRACE_LOG); #endif case _SC_TTY_NAME_MAX: path = _PATH_DEV; goto do_NAME_MAX; case _SC_TYPED_MEMORY_OBJECTS: #if _POSIX_TYPED_MEMORY_OBJECTS == 0 #error "_POSIX_TYPED_MEMORY_OBJECTS" #else return (_POSIX_TYPED_MEMORY_OBJECTS); #endif case _SC_V6_ILP32_OFF32: #if _V6_ILP32_OFF32 == 0 if (sizeof(int) * CHAR_BIT == 32 && sizeof(int) == sizeof(long) && sizeof(long) == sizeof(void *) && sizeof(void *) == sizeof(off_t)) return 1; else return -1; #else return (_V6_ILP32_OFF32); #endif case _SC_V6_ILP32_OFFBIG: #if _V6_ILP32_OFFBIG == 0 if (sizeof(int) * CHAR_BIT == 32 && sizeof(int) == sizeof(long) && sizeof(long) == sizeof(void *) && sizeof(off_t) * CHAR_BIT >= 64) return 1; else return -1; #else return (_V6_ILP32_OFFBIG); #endif case _SC_V6_LP64_OFF64: #if _V6_LP64_OFF64 == 0 if (sizeof(int) * CHAR_BIT == 32 && sizeof(long) * CHAR_BIT == 64 && sizeof(long) == sizeof(void *) && sizeof(void *) == sizeof(off_t)) return 1; else return -1; #else return (_V6_LP64_OFF64); #endif case _SC_V6_LPBIG_OFFBIG: #if _V6_LPBIG_OFFBIG == 0 if (sizeof(int) * CHAR_BIT >= 32 && sizeof(long) * CHAR_BIT >= 64 && sizeof(void *) * CHAR_BIT >= 64 && sizeof(off_t) * CHAR_BIT >= 64) return 1; else return -1; #else return (_V6_LPBIG_OFFBIG); #endif case _SC_ATEXIT_MAX: return (ATEXIT_SIZE); case _SC_IOV_MAX: mib[0] = CTL_KERN; mib[1] = KERN_IOV_MAX; break; case _SC_XOPEN_CRYPT: return (_XOPEN_CRYPT); case _SC_XOPEN_ENH_I18N: return (_XOPEN_ENH_I18N); case _SC_XOPEN_LEGACY: return (_XOPEN_LEGACY); case _SC_XOPEN_REALTIME: #if _XOPEN_REALTIME == 0 sverrno = errno; value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 && sysconf(_SC_MEMLOCK) > 0 && sysconf(_SC_MEMLOCK_RANGE) > 0 && sysconf(_SC_MESSAGE_PASSING) > 0 && sysconf(_SC_PRIORITY_SCHEDULING) > 0 && sysconf(_SC_REALTIME_SIGNALS) > 0 && sysconf(_SC_SEMAPHORES) > 0 && sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 && sysconf(_SC_SYNCHRONIZED_IO) > 0 && sysconf(_SC_TIMERS) > 0; errno = sverrno; if (value) return (200112L); else return (-1); #else return (_XOPEN_REALTIME); #endif case _SC_XOPEN_REALTIME_THREADS: #if _XOPEN_REALTIME_THREADS == 0 #error "_XOPEN_REALTIME_THREADS" #else return (_XOPEN_REALTIME_THREADS); #endif case _SC_XOPEN_SHM: len = sizeof(lvalue); sverrno = errno; if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL, 0) == -1) { errno = sverrno; return (-1); } errno = sverrno; return (1); case _SC_XOPEN_STREAMS: return (_XOPEN_STREAMS); case _SC_XOPEN_UNIX: return (_XOPEN_UNIX); #ifdef _XOPEN_VERSION case _SC_XOPEN_VERSION: return (_XOPEN_VERSION); #endif #ifdef _XOPEN_XCU_VERSION case _SC_XOPEN_XCU_VERSION: return (_XOPEN_XCU_VERSION); #endif case _SC_SYMLOOP_MAX: return (MAXSYMLINKS); case _SC_RAW_SOCKETS: return (_POSIX_RAW_SOCKETS); case _SC_IPV6: #if _POSIX_IPV6 == 0 sverrno = errno; value = _socket(PF_INET6, SOCK_DGRAM, 0); errno = sverrno; if (value >= 0) { _close(value); return (200112L); } else return (0); #else return (_POSIX_IPV6); #endif case _SC_NPROCESSORS_CONF: case _SC_NPROCESSORS_ONLN: if (_elf_aux_info(AT_NCPUS, &value, sizeof(value)) == 0) return ((long)value); mib[0] = CTL_HW; mib[1] = HW_NCPU; break; #ifdef _SC_PHYS_PAGES case _SC_PHYS_PAGES: len = sizeof(lvalue); if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1) return (-1); return (lvalue); #endif #ifdef _SC_CPUSET_SIZE case _SC_CPUSET_SIZE: len = sizeof(value); if (sysctlbyname("kern.sched.cpusetsize", &value, &len, NULL, 0) == -1) return (-1); return ((long)value); #endif default: errno = EINVAL; return (-1); } len = sizeof(value); if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) value = -1; return ((long)value); }