414 lines
10 KiB
C
414 lines
10 KiB
C
/* $NetBSD: sysconf.c,v 1.33 2008/08/06 17:17:04 matt Exp $ */
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/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Sean Eric Fagan of Cygnus Support.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94";
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#else
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__RCSID("$NetBSD: sysconf.c,v 1.33 2008/08/06 17:17:04 matt Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <errno.h>
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#include <limits.h>
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#include <time.h>
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#include <unistd.h>
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#include <paths.h>
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#include <pwd.h>
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#ifdef __weak_alias
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__weak_alias(sysconf,__sysconf)
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#endif
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/*
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* sysconf --
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* get configurable system variables.
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*
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* XXX
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* POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
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* not change during the lifetime of the calling process. This would seem
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* to require that any change to system limits kill all running processes.
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* A workaround might be to cache the values when they are first retrieved
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* and then simply return the cached value on subsequent calls. This is
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* less useful than returning up-to-date values, however.
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*/
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long
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sysconf(int name)
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{
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struct rlimit rl;
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size_t len;
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int mib[CTL_MAXNAME], value;
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unsigned int mib_len;
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struct clockinfo tmpclock;
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static int clk_tck;
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len = sizeof(value);
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/* Default length of the MIB */
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mib_len = 2;
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switch (name) {
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/* 1003.1 */
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case _SC_ARG_MAX:
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mib[0] = CTL_KERN;
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mib[1] = KERN_ARGMAX;
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break;
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case _SC_CHILD_MAX:
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return (getrlimit(RLIMIT_NPROC, &rl) ? -1 : (long)rl.rlim_cur);
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case _O_SC_CLK_TCK:
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/*
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* For applications compiled when CLK_TCK was a compile-time
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* constant.
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*/
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return 100;
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case _SC_CLK_TCK:
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/*
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* Has to be handled specially because it returns a
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* struct clockinfo instead of an integer. Also, since
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* this might be called often by some things that
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* don't grok CLK_TCK can be a macro expanding to a
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* function, cache the value.
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*/
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if (clk_tck == 0) {
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mib[0] = CTL_KERN;
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mib[1] = KERN_CLOCKRATE;
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len = sizeof(struct clockinfo);
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clk_tck = sysctl(mib, 2, &tmpclock, &len, NULL, 0)
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== -1 ? -1 : tmpclock.hz;
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}
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return(clk_tck);
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case _SC_JOB_CONTROL:
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mib[0] = CTL_KERN;
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mib[1] = KERN_JOB_CONTROL;
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goto yesno;
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case _SC_NGROUPS_MAX:
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mib[0] = CTL_KERN;
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mib[1] = KERN_NGROUPS;
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break;
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case _SC_OPEN_MAX:
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return (getrlimit(RLIMIT_NOFILE, &rl) ? -1 : (long)rl.rlim_cur);
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case _SC_STREAM_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_STREAM_MAX;
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break;
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case _SC_TZNAME_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_TZNAME_MAX;
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break;
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case _SC_SAVED_IDS:
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mib[0] = CTL_KERN;
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mib[1] = KERN_SAVED_IDS;
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goto yesno;
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case _SC_VERSION:
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mib[0] = CTL_KERN;
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mib[1] = KERN_POSIX1;
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break;
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/* 1003.1b */
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case _SC_PAGESIZE:
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return _getpagesize();
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case _SC_FSYNC:
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mib[0] = CTL_KERN;
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mib[1] = KERN_FSYNC;
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goto yesno;
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case _SC_SYNCHRONIZED_IO:
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mib[0] = CTL_KERN;
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mib[1] = KERN_SYNCHRONIZED_IO;
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goto yesno;
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case _SC_MAPPED_FILES:
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mib[0] = CTL_KERN;
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mib[1] = KERN_MAPPED_FILES;
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goto yesno;
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case _SC_MEMLOCK:
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mib[0] = CTL_KERN;
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mib[1] = KERN_MEMLOCK;
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goto yesno;
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case _SC_MEMLOCK_RANGE:
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mib[0] = CTL_KERN;
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mib[1] = KERN_MEMLOCK_RANGE;
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goto yesno;
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case _SC_MEMORY_PROTECTION:
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mib[0] = CTL_KERN;
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mib[1] = KERN_MEMORY_PROTECTION;
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goto yesno;
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case _SC_MONOTONIC_CLOCK:
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mib[0] = CTL_KERN;
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mib[1] = KERN_MONOTONIC_CLOCK;
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goto yesno;
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case _SC_SEMAPHORES:
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mib[0] = CTL_KERN;
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mib[1] = KERN_POSIX_SEMAPHORES;
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goto yesno;
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case _SC_TIMERS:
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mib[0] = CTL_KERN;
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mib[1] = KERN_POSIX_TIMERS;
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goto yesno;
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/* 1003.1c */
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case _SC_LOGIN_NAME_MAX:
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mib[0] = CTL_KERN;
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mib[1] = KERN_LOGIN_NAME_MAX;
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break;
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case _SC_THREADS:
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mib[0] = CTL_KERN;
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mib[1] = KERN_POSIX_THREADS;
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goto yesno;
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/* 1003.1j */
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case _SC_BARRIERS:
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mib[0] = CTL_KERN;
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mib[1] = KERN_POSIX_BARRIERS;
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goto yesno;
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case _SC_SPIN_LOCKS:
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mib[0] = CTL_KERN;
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mib[1] = KERN_POSIX_SPIN_LOCKS;
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goto yesno;
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/* Historical; Threads option in 1003.1-2001 */
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case _SC_READER_WRITER_LOCKS:
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mib[0] = CTL_KERN;
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mib[1] = KERN_POSIX_READER_WRITER_LOCKS;
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goto yesno;
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/* 1003.2 */
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case _SC_BC_BASE_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_BC_BASE_MAX;
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break;
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case _SC_BC_DIM_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_BC_DIM_MAX;
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break;
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case _SC_BC_SCALE_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_BC_SCALE_MAX;
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break;
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case _SC_BC_STRING_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_BC_STRING_MAX;
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break;
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case _SC_COLL_WEIGHTS_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_COLL_WEIGHTS_MAX;
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break;
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case _SC_EXPR_NEST_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_EXPR_NEST_MAX;
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break;
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case _SC_LINE_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_LINE_MAX;
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break;
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case _SC_RE_DUP_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_RE_DUP_MAX;
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break;
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case _SC_2_VERSION:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_VERSION;
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break;
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case _SC_2_C_BIND:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_C_BIND;
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goto yesno;
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case _SC_2_C_DEV:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_C_DEV;
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goto yesno;
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case _SC_2_CHAR_TERM:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_CHAR_TERM;
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goto yesno;
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case _SC_2_FORT_DEV:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_FORT_DEV;
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goto yesno;
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case _SC_2_FORT_RUN:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_FORT_RUN;
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goto yesno;
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case _SC_2_LOCALEDEF:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_LOCALEDEF;
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goto yesno;
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case _SC_2_SW_DEV:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_SW_DEV;
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goto yesno;
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case _SC_2_UPE:
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mib[0] = CTL_USER;
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mib[1] = USER_POSIX2_UPE;
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goto yesno;
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/* XPG 4.2 */
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case _SC_IOV_MAX:
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mib[0] = CTL_KERN;
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mib[1] = KERN_IOV_MAX;
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break;
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case _SC_XOPEN_SHM:
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mib[0] = CTL_KERN;
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mib[1] = KERN_SYSVIPC;
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mib[2] = KERN_SYSVIPC_SHM;
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mib_len = 3;
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goto yesno;
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/* 1003.1-2001, XSI Option Group */
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case _SC_AIO_LISTIO_MAX:
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if (sysctlgetmibinfo("kern.aio_listio_max", &mib[0], &mib_len,
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NULL, NULL, NULL, SYSCTL_VERSION))
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return -1;
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break;
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case _SC_AIO_MAX:
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if (sysctlgetmibinfo("kern.aio_max", &mib[0], &mib_len,
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NULL, NULL, NULL, SYSCTL_VERSION))
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return -1;
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break;
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case _SC_ASYNCHRONOUS_IO:
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if (sysctlgetmibinfo("kern.posix_aio", &mib[0], &mib_len,
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NULL, NULL, NULL, SYSCTL_VERSION))
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return -1;
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goto yesno;
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case _SC_MESSAGE_PASSING:
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if (sysctlgetmibinfo("kern.posix_msg", &mib[0], &mib_len,
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NULL, NULL, NULL, SYSCTL_VERSION))
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return -1;
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goto yesno;
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case _SC_MQ_OPEN_MAX:
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if (sysctlgetmibinfo("kern.mqueue.mq_open_max", &mib[0],
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&mib_len, NULL, NULL, NULL, SYSCTL_VERSION))
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return -1;
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break;
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case _SC_MQ_PRIO_MAX:
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if (sysctlgetmibinfo("kern.mqueue.mq_prio_max", &mib[0],
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&mib_len, NULL, NULL, NULL, SYSCTL_VERSION))
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return -1;
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break;
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case _SC_PRIORITY_SCHEDULING:
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if (sysctlgetmibinfo("kern.posix_sched", &mib[0], &mib_len,
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NULL, NULL, NULL, SYSCTL_VERSION))
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return -1;
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goto yesno;
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case _SC_ATEXIT_MAX:
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mib[0] = CTL_USER;
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mib[1] = USER_ATEXIT_MAX;
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break;
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/* 1003.1-2001, TSF */
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case _SC_GETGR_R_SIZE_MAX:
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return _GETGR_R_SIZE_MAX;
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case _SC_GETPW_R_SIZE_MAX:
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return _GETPW_R_SIZE_MAX;
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/* Unsorted */
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case _SC_HOST_NAME_MAX:
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return MAXHOSTNAMELEN;
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case _SC_PASS_MAX:
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return _PASSWORD_LEN;
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case _SC_REGEXP:
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return _POSIX_REGEXP;
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case _SC_SHELL:
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return _POSIX_SHELL;
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case _SC_SYMLOOP_MAX:
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return MAXSYMLINKS;
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yesno: if (sysctl(mib, mib_len, &value, &len, NULL, 0) == -1)
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return (-1);
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if (value == 0)
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return (-1);
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return (value);
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/* Extensions */
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case _SC_NPROCESSORS_CONF:
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mib[0] = CTL_HW;
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mib[1] = HW_NCPU;
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break;
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case _SC_NPROCESSORS_ONLN:
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mib[0] = CTL_HW;
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mib[1] = HW_NCPUONLINE;
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break;
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/* Native */
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case _SC_SCHED_RT_TS:
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if (sysctlgetmibinfo("kern.sched.rtts", &mib[0], &mib_len,
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NULL, NULL, NULL, SYSCTL_VERSION))
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return -1;
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break;
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case _SC_SCHED_PRI_MIN:
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if (sysctlgetmibinfo("kern.sched.pri_min", &mib[0], &mib_len,
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NULL, NULL, NULL, SYSCTL_VERSION))
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return -1;
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break;
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case _SC_SCHED_PRI_MAX:
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if (sysctlgetmibinfo("kern.sched.pri_max", &mib[0], &mib_len,
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NULL, NULL, NULL, SYSCTL_VERSION))
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return -1;
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break;
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case _SC_THREAD_DESTRUCTOR_ITERATIONS:
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return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
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case _SC_THREAD_KEYS_MAX:
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return _POSIX_THREAD_KEYS_MAX;
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case _SC_THREAD_STACK_MIN:
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return _getpagesize();
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case _SC_THREAD_THREADS_MAX:
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if (sysctlgetmibinfo("kern.maxproc", &mib[0], &mib_len,
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NULL, NULL, NULL, SYSCTL_VERSION)) /* XXX */
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return -1;
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goto yesno;
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case _SC_THREAD_ATTR_STACKADDR:
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return _POSIX_THREAD_ATTR_STACKADDR;
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case _SC_THREAD_ATTR_STACKSIZE:
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return _POSIX_THREAD_ATTR_STACKSIZE;
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case _SC_THREAD_SAFE_FUNCTIONS:
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return _POSIX_THREAD_SAFE_FUNCTIONS;
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case _SC_THREAD_PRIORITY_SCHEDULING:
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case _SC_THREAD_PRIO_INHERIT:
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case _SC_THREAD_PRIO_PROTECT:
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case _SC_THREAD_PROCESS_SHARED:
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return -1;
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case _SC_TTY_NAME_MAX:
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return pathconf(_PATH_DEV, _PC_NAME_MAX);
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default:
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errno = EINVAL;
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return (-1);
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}
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return (sysctl(mib, mib_len, &value, &len, NULL, 0) == -1 ? -1 : value);
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}
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