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.\" Copyright (C) 1996 Andries Brouwer (aeb@cwi.nl)
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" Written 11 April 1996 by Andries Brouwer <aeb@cwi.nl>
.\" 960412: Added comments from Stephen Tweedie
.\" Modified Tue Oct 22 22:28:41 1996 by Eric S. Raymond <esr@thyrsus.com>
.\" Modified Mon Jan 5 20:31:04 1998 by aeb.
.\"
.\" Japanese Version Copyright (c) 1997-1998 HANATAKA Shinya
.\" all rights reserved.
.\" Translated Fri Dec 12 00:38:54 JST 1997
.\" by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Modified by Mon May 11 23:15:17 JST 1998
.\" by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\"
.\"WORD: parameter ѥ
.\"WORD: kernel ͥ
.\"WORD: hostname ۥȥ͡
.\"WORD: open ץ
.\"WORD: directory ǥ쥯ȥ
.\"WORD: tree ĥ
.\"
.TH SYSCTL 2 "11 April 1996" "Linux 1.3.85" "Linux Programmer's Manual"
.SH ̾
sysctl \- ƥࡦѥɤ߽
.SH
.B #include <unistd.h>
.sp
.B #include <linux/unistd.h>
.sp
.B #include <linux/sysctl.h>
.sp
.B _syscall1(int, _sysctl, struct __sysctl_args *, args);
.sp
.BI "int _sysctl(struct __sysctl_args *" args );
.SH
.B _sysctl
ϥͥ(kernel)ѥɤ߽롣㤨С
ۥȥ͡(hostname)Ʊ˳(open)ȤǤեκʤɡ
ϰʲηǤ롣
.PP
.nf
struct __sysctl_args {
int *name; /* integer vector describing variable */
int nlen; /* length of this vector */
void *oldval; /* 0 or address where to store old value */
size_t *oldlenp; /* available room for old value,
overwritten by actual size of old value */
void *newval; /* 0 or address of new value */
size_t newlen; /* size of new value */
};
.fi
.PP
Υ
.BR /proc/sys
βΥǥ쥯ȥꡦĥ˻ڹ¤(tree structure)롣
ơᤵ줿ܤĤäŬڤʥ롼ƤӽФ
ͤɤ꽤ꤹ롣
.SH
.nf
#include <linux/unistd.h>
#include <linux/types.h>
#include <linux/sysctl.h>
_syscall1(int, _sysctl, struct __sysctl_args *, args);
int sysctl(int *name, int nlen, void *oldval, size_t *oldlenp,
void *newval, size_t newlen)
{
struct __sysctl_args args={name,nlen,oldval,oldlenp,newval,newlen};
return _sysctl(&args);
}
#define SIZE(x) sizeof(x)/sizeof(x[0])
#define OSNAMESZ 100
char osname[OSNAMESZ];
int osnamelth;
int name[] = { CTL_KERN, KERN_OSTYPE };
main(){
osnamelth = SIZE(osname);
if (sysctl(name, SIZE(name), osname, &osnamelth, 0, 0))
perror("sysctl");
else
printf("This machine is running %*s\en", osnamelth, osname);
return 0;
}
.fi
.SH ֤
.B _sysctl
0 ֤ǤʤСͤȤ \-1 ֤졢
.I errno
Υ顼ͤꤵ롣
.SH 顼
.TP
.B ENOTDIR
.I name
Ĥʤä
.TP
.B EPERM
'ǥ쥯ȥ'Τɤ줫˸Ĥʤä
.I oldval
ǤʤΤɤ߹ߵĤʤä
.I newval
ǤʤΤ˽ߵĤʤä
.TP
.B EFAULT
.I oldval
NULL ǤʤͤꤷơͤᤷƤΤˡ
.IR oldlenp
˶ʤ
.SH
Υ Linux ͭǤꡢܿտޤץǻѤƤ
ʤ
.SH
.B sysctl
Linux ΥС 1.3.57 ¸ߤƤ롣
4.4BSD ͳ褷Ƥ롣Linux
.I /proc/sys
˼̤(mirror)äƤꡢܤ̾դ Linux BSD 4.4 Ǥ
ۤäƤ롣
.BR sysctl (2)
ؿξȤƱǤ롣
.SH Х
֥Ȥ̾ϥͥΥСȤ˰ۤäƤ롣
֤ΤᤳΥƥࡦϥץꥱˤȤä̵ͤ
ΤȤʤäƤ
.I /proc/sys
եѤ뤳ȡ
.br
ƤβǽʹܤΤ˵ҤƤ櫓ǤϤʤ
.br
ΤȤ
.IR /proc/sys/kernel/ostype
˽ळȤǥڡ졼ƥƥѤ뤳ȤϤǤʤ
.SH Ϣ
.BR proc (5)
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