/* * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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 <sys/param.h> #include <sys/sysctl.h> #include <sys/time.h> #include <sys/resource.h> #include <errno.h> #include <unistd.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(name) int name; { struct rlimit rl; size_t len; int mib[2], value; len = sizeof(value); switch (name) { /* 1003.1 */ case _SC_ARG_MAX: mib[0] = CTL_KERN; mib[1] = KERN_ARGMAX; break; case _SC_CHILD_MAX: return (getrlimit(RLIMIT_NPROC, &rl) ? -1 : rl.rlim_cur); case _SC_CLK_TCK: return (CLK_TCK); case _SC_JOB_CONTROL: mib[0] = CTL_KERN; mib[1] = KERN_JOB_CONTROL; goto yesno; case _SC_NGROUPS_MAX: mib[0] = CTL_KERN; mib[1] = KERN_NGROUPS; break; case _SC_OPEN_MAX: return (getrlimit(RLIMIT_NOFILE, &rl) ? -1 : rl.rlim_cur); case _SC_STREAM_MAX: mib[0] = CTL_USER; mib[1] = USER_STREAM_MAX; break; case _SC_TZNAME_MAX: mib[0] = CTL_USER; mib[1] = USER_TZNAME_MAX; break; case _SC_SAVED_IDS: mib[0] = CTL_KERN; mib[1] = KERN_SAVED_IDS; goto yesno; case _SC_VERSION: mib[0] = CTL_KERN; mib[1] = KERN_POSIX1; break; /* 1003.2 */ case _SC_BC_BASE_MAX: mib[0] = CTL_USER; mib[1] = USER_BC_BASE_MAX; break; case _SC_BC_DIM_MAX: mib[0] = CTL_USER; mib[1] = USER_BC_DIM_MAX; break; case _SC_BC_SCALE_MAX: mib[0] = CTL_USER; mib[1] = USER_BC_SCALE_MAX; break; case _SC_BC_STRING_MAX: mib[0] = CTL_USER; mib[1] = USER_BC_STRING_MAX; break; case _SC_COLL_WEIGHTS_MAX: mib[0] = CTL_USER; mib[1] = USER_COLL_WEIGHTS_MAX; break; case _SC_EXPR_NEST_MAX: mib[0] = CTL_USER; mib[1] = USER_EXPR_NEST_MAX; break; case _SC_LINE_MAX: mib[0] = CTL_USER; mib[1] = USER_LINE_MAX; break; case _SC_PAGESIZE: mib[0] = CTL_HW; mib[1] = HW_PAGESIZE; break; case _SC_RE_DUP_MAX: mib[0] = CTL_USER; mib[1] = USER_RE_DUP_MAX; break; case _SC_2_VERSION: mib[0] = CTL_USER; mib[1] = USER_POSIX2_VERSION; break; case _SC_2_C_BIND: mib[0] = CTL_USER; mib[1] = USER_POSIX2_C_BIND; goto yesno; case _SC_2_C_DEV: mib[0] = CTL_USER; mib[1] = USER_POSIX2_C_DEV; goto yesno; case _SC_2_CHAR_TERM: mib[0] = CTL_USER; mib[1] = USER_POSIX2_CHAR_TERM; goto yesno; case _SC_2_FORT_DEV: mib[0] = CTL_USER; mib[1] = USER_POSIX2_FORT_DEV; goto yesno; case _SC_2_FORT_RUN: mib[0] = CTL_USER; mib[1] = USER_POSIX2_FORT_RUN; goto yesno; case _SC_2_LOCALEDEF: mib[0] = CTL_USER; mib[1] = USER_POSIX2_LOCALEDEF; goto yesno; case _SC_2_SW_DEV: mib[0] = CTL_USER; mib[1] = USER_POSIX2_SW_DEV; goto yesno; case _SC_2_UPE: mib[0] = CTL_USER; mib[1] = USER_POSIX2_UPE; yesno: if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) return (-1); if (value == 0) return (-1); return (value); break; default: errno = EINVAL; return (-1); } return (sysctl(mib, 2, &value, &len, NULL, 0) == -1 ? -1 : value); }