/* $OpenBSD: sysconf.c,v 1.27 2020/10/12 19:51:28 deraadt Exp $ */ /*- * 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. */ #include #include #include #include #include #include #include #include #include #include #include #include /* * 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], value, namelen, sverrno; len = sizeof(value); namelen = 2; switch (name) { /* 1003.1 */ 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_JOB_CONTROL: return (_POSIX_JOB_CONTROL); 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_TZNAME_MAX: return (NAME_MAX); case _SC_SAVED_IDS: return (_POSIX_SAVED_IDS); case _SC_VERSION: mib[0] = CTL_KERN; mib[1] = KERN_POSIX1; break; /* 1003.1b */ case _SC_PAGESIZE: if (_pagesize != 0) return (_pagesize); mib[0] = CTL_HW; mib[1] = HW_PAGESIZE; break; case _SC_FSYNC: return (_POSIX_FSYNC); /* 1003.1c */ case _SC_LOGIN_NAME_MAX: return (LOGIN_NAME_MAX); case _SC_THREAD_SAFE_FUNCTIONS: return (_POSIX_THREAD_SAFE_FUNCTIONS); case _SC_GETGR_R_SIZE_MAX: return (_GR_BUF_LEN); case _SC_GETPW_R_SIZE_MAX: return (_PW_BUF_LEN); /* 1003.2 */ 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: 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); /* XPG 4.2 */ case _SC_XOPEN_SHM: mib[0] = CTL_KERN; mib[1] = KERN_SYSVSHM; if (sysctl(mib, namelen, &value, &len, NULL, 0) == -1) return (-1); if (value == 0) return (-1); return (value); break; case _SC_SEM_NSEMS_MAX: return (-1); case _SC_SEM_VALUE_MAX: return (SEM_VALUE_MAX); /* Unsorted */ case _SC_HOST_NAME_MAX: return (HOST_NAME_MAX); /* does not include \0 */ case _SC_MONOTONIC_CLOCK: return (_POSIX_MONOTONIC_CLOCK); 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: return (_POSIX2_PBS); case _SC_ADVISORY_INFO: return (_POSIX_ADVISORY_INFO); case _SC_AIO_LISTIO_MAX: case _SC_AIO_MAX: case _SC_AIO_PRIO_DELTA_MAX: return (-1); case _SC_ASYNCHRONOUS_IO: return (_POSIX_ASYNCHRONOUS_IO); case _SC_ATEXIT_MAX: return (-1); case _SC_BARRIERS: return (_POSIX_BARRIERS); case _SC_CLOCK_SELECTION: return (_POSIX_CLOCK_SELECTION); case _SC_CPUTIME: return (_POSIX_CPUTIME); case _SC_DELAYTIMER_MAX: return (-1); case _SC_IOV_MAX: return (IOV_MAX); case _SC_IPV6: #if _POSIX_IPV6 == 0 sverrno = errno; value = socket(PF_INET6, SOCK_DGRAM, 0); errno = sverrno; if (value >= 0) { HIDDEN(close)(value); return (200112L); } else return (0); #else return (_POSIX_IPV6); #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: return (_POSIX_MESSAGE_PASSING); case _SC_PRIORITIZED_IO: return (_POSIX_PRIORITIZED_IO); case _SC_PRIORITY_SCHEDULING: return (_POSIX_PRIORITY_SCHEDULING); case _SC_RAW_SOCKETS: return (_POSIX_RAW_SOCKETS); case _SC_READER_WRITER_LOCKS: return (_POSIX_READER_WRITER_LOCKS); case _SC_REALTIME_SIGNALS: return (_POSIX_REALTIME_SIGNALS); case _SC_REGEXP: return (_POSIX_REGEXP); case _SC_SEMAPHORES: return (_POSIX_SEMAPHORES); case _SC_SHARED_MEMORY_OBJECTS: return (_POSIX_SHARED_MEMORY_OBJECTS); case _SC_SHELL: return (_POSIX_SHELL); case _SC_SIGQUEUE_MAX: return (-1); case _SC_SPAWN: return (_POSIX_SPAWN); case _SC_SPIN_LOCKS: return (_POSIX_SPIN_LOCKS); case _SC_SPORADIC_SERVER: return (_POSIX_SPORADIC_SERVER); case _SC_SYNCHRONIZED_IO: return (_POSIX_SYNCHRONIZED_IO); case _SC_SYMLOOP_MAX: return (SYMLOOP_MAX); 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_ROBUST_PRIO_INHERIT: return (_POSIX_THREAD_ROBUST_PRIO_INHERIT); case _SC_THREAD_ROBUST_PRIO_PROTECT: return (_POSIX_THREAD_ROBUST_PRIO_PROTECT); case _SC_THREAD_SPORADIC_SERVER: return (_POSIX_THREAD_SPORADIC_SERVER); case _SC_THREAD_STACK_MIN: return (PTHREAD_STACK_MIN); case _SC_THREAD_THREADS_MAX: return (PTHREAD_THREADS_MAX); case _SC_THREADS: return (_POSIX_THREADS); case _SC_TIMEOUTS: return (_POSIX_TIMEOUTS); case _SC_TIMER_MAX: return (-1); case _SC_TIMERS: return (_POSIX_TIMERS); case _SC_TRACE: case _SC_TRACE_EVENT_FILTER: case _SC_TRACE_EVENT_NAME_MAX: case _SC_TRACE_INHERIT: case _SC_TRACE_LOG: return (_POSIX_TRACE); case _SC_TTY_NAME_MAX: return (TTY_NAME_MAX); case _SC_TYPED_MEMORY_OBJECTS: return (_POSIX_TYPED_MEMORY_OBJECTS); case _SC_V6_ILP32_OFF32: return (_POSIX_V6_ILP32_OFF32); case _SC_V6_ILP32_OFFBIG: #if _POSIX_V6_ILP32_OFFBIG == 0 if (sizeof(int) * CHAR_BIT == 32 && sizeof(long) * CHAR_BIT == 32 && sizeof(void *) * CHAR_BIT == 32 && sizeof(off_t) * CHAR_BIT >= 64) return 1; else return -1; #else return (_POSIX_V6_ILP32_OFFBIG); #endif case _SC_V6_LP64_OFF64: #if _POSIX_V6_LP64_OFF64 == 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 (_POSIX_V6_LP64_OFF64); #endif case _SC_V6_LPBIG_OFFBIG: #if _POSIX_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 (_POSIX_V6_LPBIG_OFFBIG); #endif case _SC_V7_ILP32_OFF32: return (_POSIX_V7_ILP32_OFF32); case _SC_V7_ILP32_OFFBIG: #if _POSIX_V7_ILP32_OFFBIG == 0 if (sizeof(int) * CHAR_BIT == 32 && sizeof(long) * CHAR_BIT == 32 && sizeof(void *) * CHAR_BIT == 32 && sizeof(off_t) * CHAR_BIT >= 64) return 1; else return -1; #else return (_POSIX_V7_ILP32_OFFBIG); #endif case _SC_V7_LP64_OFF64: #if _POSIX_V7_LP64_OFF64 == 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 (_POSIX_V7_LP64_OFF64); #endif case _SC_V7_LPBIG_OFFBIG: #if _POSIX_V7_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 (_POSIX_V7_LPBIG_OFFBIG); #endif 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: return (_XOPEN_REALTIME); case _SC_XOPEN_REALTIME_THREADS: return (_XOPEN_REALTIME_THREADS); case _SC_XOPEN_STREAMS: return (_XOPEN_STREAMS); case _SC_XOPEN_UNIX: return (_XOPEN_UNIX); case _SC_XOPEN_UUCP: return (_XOPEN_UUCP); #ifdef _XOPEN_VERSION case _SC_XOPEN_VERSION: return (_XOPEN_VERSION); #endif /* Extensions */ case _SC_PHYS_PAGES: { int64_t physmem; mib[0] = CTL_HW; mib[1] = HW_PHYSMEM64; len = sizeof(physmem); if (sysctl(mib, namelen, &physmem, &len, NULL, 0) == -1) return (-1); return (physmem / getpagesize()); } case _SC_AVPHYS_PAGES: { struct uvmexp uvmexp; mib[0] = CTL_VM; mib[1] = VM_UVMEXP; len = sizeof(uvmexp); if (sysctl(mib, namelen, &uvmexp, &len, NULL, 0) == -1) return (-1); return (uvmexp.free); } case _SC_NPROCESSORS_CONF: mib[0] = CTL_HW; mib[1] = HW_NCPU; break; case _SC_NPROCESSORS_ONLN: mib[0] = CTL_HW; mib[1] = HW_NCPUONLINE; break; default: errno = EINVAL; return (-1); } return (sysctl(mib, namelen, &value, &len, NULL, 0) == -1 ? -1 : value); } DEF_WEAK(sysconf);