sysconf.c revision 36577
11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * This code is derived from software contributed to Berkeley by 61573Srgrimes * Sean Eric Fagan of Cygnus Support. 71573Srgrimes * 81573Srgrimes * Redistribution and use in source and binary forms, with or without 91573Srgrimes * modification, are permitted provided that the following conditions 101573Srgrimes * are met: 111573Srgrimes * 1. Redistributions of source code must retain the above copyright 121573Srgrimes * notice, this list of conditions and the following disclaimer. 131573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141573Srgrimes * notice, this list of conditions and the following disclaimer in the 151573Srgrimes * documentation and/or other materials provided with the distribution. 161573Srgrimes * 3. All advertising materials mentioning features or use of this software 171573Srgrimes * must display the following acknowledgement: 181573Srgrimes * This product includes software developed by the University of 191573Srgrimes * California, Berkeley and its contributors. 201573Srgrimes * 4. Neither the name of the University nor the names of its contributors 211573Srgrimes * may be used to endorse or promote products derived from this software 221573Srgrimes * without specific prior written permission. 231573Srgrimes * 241573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341573Srgrimes * SUCH DAMAGE. 351573Srgrimes */ 361573Srgrimes 371573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 381573Srgrimesstatic char sccsid[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94"; 391573Srgrimes#endif /* LIBC_SCCS and not lint */ 401573Srgrimes 4134925Sdufault#include <sys/_posix.h> 421573Srgrimes#include <sys/param.h> 4312674Sdg#include <sys/time.h> 441573Srgrimes#include <sys/sysctl.h> 451573Srgrimes#include <sys/resource.h> 461573Srgrimes 471573Srgrimes#include <errno.h> 486171Sbde#include <time.h> 491573Srgrimes#include <unistd.h> 501573Srgrimes 511573Srgrimes/* 521573Srgrimes * sysconf -- 531573Srgrimes * get configurable system variables. 541573Srgrimes * 551573Srgrimes * XXX 561573Srgrimes * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values 571573Srgrimes * not change during the lifetime of the calling process. This would seem 581573Srgrimes * to require that any change to system limits kill all running processes. 591573Srgrimes * A workaround might be to cache the values when they are first retrieved 601573Srgrimes * and then simply return the cached value on subsequent calls. This is 611573Srgrimes * less useful than returning up-to-date values, however. 621573Srgrimes */ 631573Srgrimeslong 641573Srgrimessysconf(name) 651573Srgrimes int name; 661573Srgrimes{ 671573Srgrimes struct rlimit rl; 681573Srgrimes size_t len; 691573Srgrimes int mib[2], value; 7036577Smsmith long defaultresult; 711573Srgrimes 721573Srgrimes len = sizeof(value); 7336577Smsmith defaultresult = -1; 741573Srgrimes 751573Srgrimes switch (name) { 761573Srgrimes/* 1003.1 */ 771573Srgrimes case _SC_ARG_MAX: 781573Srgrimes mib[0] = CTL_KERN; 791573Srgrimes mib[1] = KERN_ARGMAX; 801573Srgrimes break; 811573Srgrimes case _SC_CHILD_MAX: 821573Srgrimes return (getrlimit(RLIMIT_NPROC, &rl) ? -1 : rl.rlim_cur); 831573Srgrimes case _SC_CLK_TCK: 841573Srgrimes return (CLK_TCK); 851573Srgrimes case _SC_JOB_CONTROL: 861573Srgrimes mib[0] = CTL_KERN; 871573Srgrimes mib[1] = KERN_JOB_CONTROL; 881573Srgrimes goto yesno; 891573Srgrimes case _SC_NGROUPS_MAX: 901573Srgrimes mib[0] = CTL_KERN; 911573Srgrimes mib[1] = KERN_NGROUPS; 921573Srgrimes break; 931573Srgrimes case _SC_OPEN_MAX: 941573Srgrimes return (getrlimit(RLIMIT_NOFILE, &rl) ? -1 : rl.rlim_cur); 951573Srgrimes case _SC_STREAM_MAX: 961573Srgrimes mib[0] = CTL_USER; 971573Srgrimes mib[1] = USER_STREAM_MAX; 981573Srgrimes break; 991573Srgrimes case _SC_TZNAME_MAX: 1001573Srgrimes mib[0] = CTL_USER; 1011573Srgrimes mib[1] = USER_TZNAME_MAX; 1021573Srgrimes break; 1031573Srgrimes case _SC_SAVED_IDS: 1041573Srgrimes mib[0] = CTL_KERN; 1051573Srgrimes mib[1] = KERN_SAVED_IDS; 1061573Srgrimes goto yesno; 1071573Srgrimes case _SC_VERSION: 1081573Srgrimes mib[0] = CTL_KERN; 1091573Srgrimes mib[1] = KERN_POSIX1; 1101573Srgrimes break; 1111573Srgrimes 1121573Srgrimes/* 1003.2 */ 1131573Srgrimes case _SC_BC_BASE_MAX: 1141573Srgrimes mib[0] = CTL_USER; 1151573Srgrimes mib[1] = USER_BC_BASE_MAX; 1161573Srgrimes break; 1171573Srgrimes case _SC_BC_DIM_MAX: 1181573Srgrimes mib[0] = CTL_USER; 1191573Srgrimes mib[1] = USER_BC_DIM_MAX; 1201573Srgrimes break; 1211573Srgrimes case _SC_BC_SCALE_MAX: 1221573Srgrimes mib[0] = CTL_USER; 1231573Srgrimes mib[1] = USER_BC_SCALE_MAX; 1241573Srgrimes break; 1251573Srgrimes case _SC_BC_STRING_MAX: 1261573Srgrimes mib[0] = CTL_USER; 1271573Srgrimes mib[1] = USER_BC_STRING_MAX; 1281573Srgrimes break; 1291573Srgrimes case _SC_COLL_WEIGHTS_MAX: 1301573Srgrimes mib[0] = CTL_USER; 1311573Srgrimes mib[1] = USER_COLL_WEIGHTS_MAX; 1321573Srgrimes break; 1331573Srgrimes case _SC_EXPR_NEST_MAX: 1341573Srgrimes mib[0] = CTL_USER; 1351573Srgrimes mib[1] = USER_EXPR_NEST_MAX; 1361573Srgrimes break; 1371573Srgrimes case _SC_LINE_MAX: 1381573Srgrimes mib[0] = CTL_USER; 1391573Srgrimes mib[1] = USER_LINE_MAX; 1401573Srgrimes break; 1411573Srgrimes case _SC_RE_DUP_MAX: 1421573Srgrimes mib[0] = CTL_USER; 1431573Srgrimes mib[1] = USER_RE_DUP_MAX; 1441573Srgrimes break; 1451573Srgrimes case _SC_2_VERSION: 1461573Srgrimes mib[0] = CTL_USER; 1471573Srgrimes mib[1] = USER_POSIX2_VERSION; 1481573Srgrimes break; 1491573Srgrimes case _SC_2_C_BIND: 1501573Srgrimes mib[0] = CTL_USER; 1511573Srgrimes mib[1] = USER_POSIX2_C_BIND; 1521573Srgrimes goto yesno; 1531573Srgrimes case _SC_2_C_DEV: 1541573Srgrimes mib[0] = CTL_USER; 1551573Srgrimes mib[1] = USER_POSIX2_C_DEV; 1561573Srgrimes goto yesno; 1571573Srgrimes case _SC_2_CHAR_TERM: 1581573Srgrimes mib[0] = CTL_USER; 1591573Srgrimes mib[1] = USER_POSIX2_CHAR_TERM; 1601573Srgrimes goto yesno; 1611573Srgrimes case _SC_2_FORT_DEV: 1621573Srgrimes mib[0] = CTL_USER; 1631573Srgrimes mib[1] = USER_POSIX2_FORT_DEV; 1641573Srgrimes goto yesno; 1651573Srgrimes case _SC_2_FORT_RUN: 1661573Srgrimes mib[0] = CTL_USER; 1671573Srgrimes mib[1] = USER_POSIX2_FORT_RUN; 1681573Srgrimes goto yesno; 1691573Srgrimes case _SC_2_LOCALEDEF: 1701573Srgrimes mib[0] = CTL_USER; 1711573Srgrimes mib[1] = USER_POSIX2_LOCALEDEF; 1721573Srgrimes goto yesno; 1731573Srgrimes case _SC_2_SW_DEV: 1741573Srgrimes mib[0] = CTL_USER; 1751573Srgrimes mib[1] = USER_POSIX2_SW_DEV; 1761573Srgrimes goto yesno; 1771573Srgrimes case _SC_2_UPE: 1781573Srgrimes mib[0] = CTL_USER; 1791573Srgrimes mib[1] = USER_POSIX2_UPE; 18034030Sdufault goto yesno; 18134030Sdufault 18234925Sdufault#ifdef _P1003_1B_VISIBLE 18334925Sdufault /* POSIX.1B */ 18434030Sdufault 18534030Sdufault case _SC_ASYNCHRONOUS_IO: 18634925Sdufault mib[0] = CTL_P1003_1B; 18734925Sdufault mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO; 18834030Sdufault goto yesno; 18934030Sdufault case _SC_MAPPED_FILES: 19034925Sdufault mib[0] = CTL_P1003_1B; 19134925Sdufault mib[1] = CTL_P1003_1B_MAPPED_FILES; 19234030Sdufault goto yesno; 19334030Sdufault case _SC_MEMLOCK: 19434925Sdufault mib[0] = CTL_P1003_1B; 19534925Sdufault mib[1] = CTL_P1003_1B_MEMLOCK; 19634030Sdufault goto yesno; 19734030Sdufault case _SC_MEMLOCK_RANGE: 19834925Sdufault mib[0] = CTL_P1003_1B; 19934925Sdufault mib[1] = CTL_P1003_1B_MEMLOCK_RANGE; 20034030Sdufault goto yesno; 20134030Sdufault case _SC_MEMORY_PROTECTION: 20234925Sdufault mib[0] = CTL_P1003_1B; 20334925Sdufault mib[1] = CTL_P1003_1B_MEMORY_PROTECTION; 20434030Sdufault goto yesno; 20534030Sdufault case _SC_MESSAGE_PASSING: 20634925Sdufault mib[0] = CTL_P1003_1B; 20734925Sdufault mib[1] = CTL_P1003_1B_MESSAGE_PASSING; 20834030Sdufault goto yesno; 20934030Sdufault case _SC_PRIORITIZED_IO: 21034925Sdufault mib[0] = CTL_P1003_1B; 21134925Sdufault mib[1] = CTL_P1003_1B_PRIORITIZED_IO; 21234030Sdufault goto yesno; 21334030Sdufault case _SC_PRIORITY_SCHEDULING: 21434925Sdufault mib[0] = CTL_P1003_1B; 21534925Sdufault mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING; 21634030Sdufault goto yesno; 21734030Sdufault case _SC_REALTIME_SIGNALS: 21834925Sdufault mib[0] = CTL_P1003_1B; 21934925Sdufault mib[1] = CTL_P1003_1B_REALTIME_SIGNALS; 22034030Sdufault goto yesno; 22134030Sdufault case _SC_SEMAPHORES: 22234925Sdufault mib[0] = CTL_P1003_1B; 22334925Sdufault mib[1] = CTL_P1003_1B_SEMAPHORES; 22434030Sdufault goto yesno; 22534030Sdufault case _SC_FSYNC: 22634925Sdufault mib[0] = CTL_P1003_1B; 22734925Sdufault mib[1] = CTL_P1003_1B_FSYNC; 22834030Sdufault goto yesno; 22934030Sdufault case _SC_SHARED_MEMORY_OBJECTS: 23034925Sdufault mib[0] = CTL_P1003_1B; 23134925Sdufault mib[1] = CTL_P1003_1B_SHARED_MEMORY_OBJECTS; 23234030Sdufault goto yesno; 23334030Sdufault case _SC_SYNCHRONIZED_IO: 23434925Sdufault mib[0] = CTL_P1003_1B; 23534925Sdufault mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO; 23634030Sdufault goto yesno; 23734030Sdufault case _SC_TIMERS: 23834925Sdufault mib[0] = CTL_P1003_1B; 23934925Sdufault mib[1] = CTL_P1003_1B_TIMERS; 24034030Sdufault goto yesno; 24134030Sdufault case _SC_AIO_LISTIO_MAX: 24234925Sdufault mib[0] = CTL_P1003_1B; 24334925Sdufault mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX; 24434030Sdufault goto yesno; 24534030Sdufault case _SC_AIO_MAX: 24634925Sdufault mib[0] = CTL_P1003_1B; 24734925Sdufault mib[1] = CTL_P1003_1B_AIO_MAX; 24834030Sdufault goto yesno; 24934030Sdufault case _SC_AIO_PRIO_DELTA_MAX: 25034925Sdufault mib[0] = CTL_P1003_1B; 25134925Sdufault mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX; 25234030Sdufault goto yesno; 25334030Sdufault case _SC_DELAYTIMER_MAX: 25434925Sdufault mib[0] = CTL_P1003_1B; 25534925Sdufault mib[1] = CTL_P1003_1B_DELAYTIMER_MAX; 25634030Sdufault goto yesno; 25734030Sdufault case _SC_MQ_OPEN_MAX: 25834925Sdufault mib[0] = CTL_P1003_1B; 25934925Sdufault mib[1] = CTL_P1003_1B_MQ_OPEN_MAX; 26034030Sdufault goto yesno; 26134030Sdufault case _SC_PAGESIZE: 26236577Smsmith defaultresult = getpagesize(); 26334925Sdufault mib[0] = CTL_P1003_1B; 26434925Sdufault mib[1] = CTL_P1003_1B_PAGESIZE; 26534030Sdufault goto yesno; 26634030Sdufault case _SC_RTSIG_MAX: 26734925Sdufault mib[0] = CTL_P1003_1B; 26834925Sdufault mib[1] = CTL_P1003_1B_RTSIG_MAX; 26934030Sdufault goto yesno; 27034030Sdufault case _SC_SEM_NSEMS_MAX: 27134925Sdufault mib[0] = CTL_P1003_1B; 27234925Sdufault mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX; 27334030Sdufault goto yesno; 27434030Sdufault case _SC_SEM_VALUE_MAX: 27534925Sdufault mib[0] = CTL_P1003_1B; 27634925Sdufault mib[1] = CTL_P1003_1B_SEM_VALUE_MAX; 27734030Sdufault goto yesno; 27834030Sdufault case _SC_SIGQUEUE_MAX: 27934925Sdufault mib[0] = CTL_P1003_1B; 28034925Sdufault mib[1] = CTL_P1003_1B_SIGQUEUE_MAX; 28134030Sdufault goto yesno; 28234030Sdufault case _SC_TIMER_MAX: 28334925Sdufault mib[0] = CTL_P1003_1B; 28434925Sdufault mib[1] = CTL_P1003_1B_TIMER_MAX; 28534030Sdufault goto yesno; 28634925Sdufault#endif /* _P1003_1B_VISIBLE */ 28734030Sdufault 2881573Srgrimesyesno: if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) 2891573Srgrimes return (-1); 2901573Srgrimes if (value == 0) 29136577Smsmith return (defaultresult); 2921573Srgrimes return (value); 2931573Srgrimes break; 2941573Srgrimes default: 2951573Srgrimes errno = EINVAL; 2961573Srgrimes return (-1); 2971573Srgrimes } 2988870Srgrimes return (sysctl(mib, 2, &value, &len, NULL, 0) == -1 ? -1 : value); 2991573Srgrimes} 300