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minix/lib/libc/gen/sysconf.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify. 
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

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/* $NetBSD: sysconf.c,v 1.33 2008/08/06 17:17:04 matt 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 <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94";
#else
__RCSID("$NetBSD: sysconf.c,v 1.33 2008/08/06 17:17:04 matt Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <errno.h>
#include <limits.h>
#include <time.h>
#include <unistd.h>
#include <paths.h>
#include <pwd.h>
#ifdef __weak_alias
__weak_alias(sysconf,__sysconf)
#endif
/*
* 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[CTL_MAXNAME], value;
unsigned int mib_len;
struct clockinfo tmpclock;
static int clk_tck;
len = sizeof(value);
/* Default length of the MIB */
mib_len = 2;
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 : (long)rl.rlim_cur);
case _O_SC_CLK_TCK:
/*
* For applications compiled when CLK_TCK was a compile-time
* constant.
*/
return 100;
case _SC_CLK_TCK:
/*
* Has to be handled specially because it returns a
* struct clockinfo instead of an integer. Also, since
* this might be called often by some things that
* don't grok CLK_TCK can be a macro expanding to a
* function, cache the value.
*/
if (clk_tck == 0) {
mib[0] = CTL_KERN;
mib[1] = KERN_CLOCKRATE;
len = sizeof(struct clockinfo);
clk_tck = sysctl(mib, 2, &tmpclock, &len, NULL, 0)
== -1 ? -1 : tmpclock.hz;
}
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 : (long)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;
/* 1003.1b */
case _SC_PAGESIZE:
return _getpagesize();
case _SC_FSYNC:
mib[0] = CTL_KERN;
mib[1] = KERN_FSYNC;
goto yesno;
case _SC_SYNCHRONIZED_IO:
mib[0] = CTL_KERN;
mib[1] = KERN_SYNCHRONIZED_IO;
goto yesno;
case _SC_MAPPED_FILES:
mib[0] = CTL_KERN;
mib[1] = KERN_MAPPED_FILES;
goto yesno;
case _SC_MEMLOCK:
mib[0] = CTL_KERN;
mib[1] = KERN_MEMLOCK;
goto yesno;
case _SC_MEMLOCK_RANGE:
mib[0] = CTL_KERN;
mib[1] = KERN_MEMLOCK_RANGE;
goto yesno;
case _SC_MEMORY_PROTECTION:
mib[0] = CTL_KERN;
mib[1] = KERN_MEMORY_PROTECTION;
goto yesno;
case _SC_MONOTONIC_CLOCK:
mib[0] = CTL_KERN;
mib[1] = KERN_MONOTONIC_CLOCK;
goto yesno;
case _SC_SEMAPHORES:
mib[0] = CTL_KERN;
mib[1] = KERN_POSIX_SEMAPHORES;
goto yesno;
case _SC_TIMERS:
mib[0] = CTL_KERN;
mib[1] = KERN_POSIX_TIMERS;
goto yesno;
/* 1003.1c */
case _SC_LOGIN_NAME_MAX:
mib[0] = CTL_KERN;
mib[1] = KERN_LOGIN_NAME_MAX;
break;
case _SC_THREADS:
mib[0] = CTL_KERN;
mib[1] = KERN_POSIX_THREADS;
goto yesno;
/* 1003.1j */
case _SC_BARRIERS:
mib[0] = CTL_KERN;
mib[1] = KERN_POSIX_BARRIERS;
goto yesno;
case _SC_SPIN_LOCKS:
mib[0] = CTL_KERN;
mib[1] = KERN_POSIX_SPIN_LOCKS;
goto yesno;
/* Historical; Threads option in 1003.1-2001 */
case _SC_READER_WRITER_LOCKS:
mib[0] = CTL_KERN;
mib[1] = KERN_POSIX_READER_WRITER_LOCKS;
goto yesno;
/* 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_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;
goto yesno;
/* XPG 4.2 */
case _SC_IOV_MAX:
mib[0] = CTL_KERN;
mib[1] = KERN_IOV_MAX;
break;
case _SC_XOPEN_SHM:
mib[0] = CTL_KERN;
mib[1] = KERN_SYSVIPC;
mib[2] = KERN_SYSVIPC_SHM;
mib_len = 3;
goto yesno;
/* 1003.1-2001, XSI Option Group */
case _SC_AIO_LISTIO_MAX:
if (sysctlgetmibinfo("kern.aio_listio_max", &mib[0], &mib_len,
NULL, NULL, NULL, SYSCTL_VERSION))
return -1;
break;
case _SC_AIO_MAX:
if (sysctlgetmibinfo("kern.aio_max", &mib[0], &mib_len,
NULL, NULL, NULL, SYSCTL_VERSION))
return -1;
break;
case _SC_ASYNCHRONOUS_IO:
if (sysctlgetmibinfo("kern.posix_aio", &mib[0], &mib_len,
NULL, NULL, NULL, SYSCTL_VERSION))
return -1;
goto yesno;
case _SC_MESSAGE_PASSING:
if (sysctlgetmibinfo("kern.posix_msg", &mib[0], &mib_len,
NULL, NULL, NULL, SYSCTL_VERSION))
return -1;
goto yesno;
case _SC_MQ_OPEN_MAX:
if (sysctlgetmibinfo("kern.mqueue.mq_open_max", &mib[0],
&mib_len, NULL, NULL, NULL, SYSCTL_VERSION))
return -1;
break;
case _SC_MQ_PRIO_MAX:
if (sysctlgetmibinfo("kern.mqueue.mq_prio_max", &mib[0],
&mib_len, NULL, NULL, NULL, SYSCTL_VERSION))
return -1;
break;
case _SC_PRIORITY_SCHEDULING:
if (sysctlgetmibinfo("kern.posix_sched", &mib[0], &mib_len,
NULL, NULL, NULL, SYSCTL_VERSION))
return -1;
goto yesno;
case _SC_ATEXIT_MAX:
mib[0] = CTL_USER;
mib[1] = USER_ATEXIT_MAX;
break;
/* 1003.1-2001, TSF */
case _SC_GETGR_R_SIZE_MAX:
return _GETGR_R_SIZE_MAX;
case _SC_GETPW_R_SIZE_MAX:
return _GETPW_R_SIZE_MAX;
/* Unsorted */
case _SC_HOST_NAME_MAX:
return MAXHOSTNAMELEN;
case _SC_PASS_MAX:
return _PASSWORD_LEN;
case _SC_REGEXP:
return _POSIX_REGEXP;
case _SC_SHELL:
return _POSIX_SHELL;
case _SC_SYMLOOP_MAX:
return MAXSYMLINKS;
yesno: if (sysctl(mib, mib_len, &value, &len, NULL, 0) == -1)
return (-1);
if (value == 0)
return (-1);
return (value);
/* Extensions */
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;
/* Native */
case _SC_SCHED_RT_TS:
if (sysctlgetmibinfo("kern.sched.rtts", &mib[0], &mib_len,
NULL, NULL, NULL, SYSCTL_VERSION))
return -1;
break;
case _SC_SCHED_PRI_MIN:
if (sysctlgetmibinfo("kern.sched.pri_min", &mib[0], &mib_len,
NULL, NULL, NULL, SYSCTL_VERSION))
return -1;
break;
case _SC_SCHED_PRI_MAX:
if (sysctlgetmibinfo("kern.sched.pri_max", &mib[0], &mib_len,
NULL, NULL, NULL, SYSCTL_VERSION))
return -1;
break;
case _SC_THREAD_DESTRUCTOR_ITERATIONS:
return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
case _SC_THREAD_KEYS_MAX:
return _POSIX_THREAD_KEYS_MAX;
case _SC_THREAD_STACK_MIN:
return _getpagesize();
case _SC_THREAD_THREADS_MAX:
if (sysctlgetmibinfo("kern.maxproc", &mib[0], &mib_len,
NULL, NULL, NULL, SYSCTL_VERSION)) /* XXX */
return -1;
goto yesno;
case _SC_THREAD_ATTR_STACKADDR:
return _POSIX_THREAD_ATTR_STACKADDR;
case _SC_THREAD_ATTR_STACKSIZE:
return _POSIX_THREAD_ATTR_STACKSIZE;
case _SC_THREAD_SAFE_FUNCTIONS:
return _POSIX_THREAD_SAFE_FUNCTIONS;
case _SC_THREAD_PRIORITY_SCHEDULING:
case _SC_THREAD_PRIO_INHERIT:
case _SC_THREAD_PRIO_PROTECT:
case _SC_THREAD_PROCESS_SHARED:
return -1;
case _SC_TTY_NAME_MAX:
return pathconf(_PATH_DEV, _PC_NAME_MAX);
default:
errno = EINVAL;
return (-1);
}
return (sysctl(mib, mib_len, &value, &len, NULL, 0) == -1 ? -1 : value);
}
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